//! Test harness for constructing `AgentDeps` with sensible defaults.
//!
//! Provides:
//! - [`StubLlm`]: A configurable LLM provider that returns a fixed response
//! - [`StubChannel`]: A configurable channel stub with message injection and response capture
//! - [`TestHarnessBuilder`]: Builder for wiring `AgentDeps` with defaults
//! - [`TestHarness`]: The assembled components ready for use in tests
//!
//! # Usage
//!
//! ```rust,no_run
//! use ironclaw::testing::TestHarnessBuilder;
//!
//! #[tokio::test]
//! async fn test_something() {
//!     let harness = TestHarnessBuilder::new().build().await;
//!     // use harness.deps, harness.db, etc.
//! }
//! ```

pub mod credentials;
pub mod fault_injection;

use std::sync::Arc;
use std::sync::Mutex;

use std::sync::atomic::{AtomicBool, AtomicU32, Ordering};

use async_trait::async_trait;
use rust_decimal::Decimal;
use tokio::sync::mpsc;

use crate::agent::AgentDeps;
use crate::channels::{
    Channel, ChannelManager, IncomingMessage, MessageStream, OutgoingResponse, StatusUpdate,
};
use crate::db::Database;
use crate::error::{ChannelError, LlmError};
use crate::llm::{
    CompletionRequest, CompletionResponse, FinishReason, LlmProvider, ToolCompletionRequest,
    ToolCompletionResponse,
};
use crate::tools::ToolRegistry;

/// Create a libSQL-backed test database in a temporary directory.
///
/// Returns the database and a `TempDir` guard — the database file is
/// deleted when the guard is dropped.
#[cfg(feature = "libsql")]
pub async fn test_db() -> (Arc<dyn Database>, tempfile::TempDir) {
    use crate::db::libsql::LibSqlBackend;

    let dir = tempfile::tempdir().expect("failed to create temp dir");
    let path = dir.path().join("test.db");
    let backend = LibSqlBackend::new_local(&path)
        .await
        .expect("failed to create test LibSqlBackend");
    backend
        .run_migrations()
        .await
        .expect("failed to run migrations");
    (Arc::new(backend) as Arc<dyn Database>, dir)
}

/// What kind of error the stub should produce when failing.
#[derive(Clone, Copy, Debug)]
pub enum StubErrorKind {
    /// Transient/retryable error (`LlmError::RequestFailed`).
    Transient,
    /// Non-transient error (`LlmError::ContextLengthExceeded`).
    NonTransient,
}

/// A configurable LLM provider stub for tests.
///
/// Supports:
/// - Fixed response content
/// - Call counting via [`calls()`](Self::calls)
/// - Runtime failure toggling via [`set_failing()`](Self::set_failing)
/// - Configurable error kinds (transient vs non-transient)
///
/// Use this in tests instead of creating ad-hoc stub implementations.
pub struct StubLlm {
    model_name: String,
    response: String,
    call_count: AtomicU32,
    should_fail: AtomicBool,
    error_kind: StubErrorKind,
    /// Optional fault injector for fine-grained failure control.
    /// When set, takes precedence over the `should_fail` / `error_kind` fields.
    fault_injector: Option<Arc<fault_injection::FaultInjector>>,
}

impl StubLlm {
    /// Create a new stub that returns the given response.
    pub fn new(response: impl Into<String>) -> Self {
        Self {
            model_name: "stub-model".to_string(),
            response: response.into(),
            call_count: AtomicU32::new(0),
            should_fail: AtomicBool::new(false),
            error_kind: StubErrorKind::Transient,
            fault_injector: None,
        }
    }

    /// Create a stub that always fails with a transient error.
    pub fn failing(name: impl Into<String>) -> Self {
        Self {
            model_name: name.into(),
            response: String::new(),
            call_count: AtomicU32::new(0),
            should_fail: AtomicBool::new(true),
            error_kind: StubErrorKind::Transient,
            fault_injector: None,
        }
    }

    /// Create a stub that always fails with a non-transient error.
    pub fn failing_non_transient(name: impl Into<String>) -> Self {
        Self {
            model_name: name.into(),
            response: String::new(),
            call_count: AtomicU32::new(0),
            should_fail: AtomicBool::new(true),
            error_kind: StubErrorKind::NonTransient,
            fault_injector: None,
        }
    }

    /// Set the model name.
    pub fn with_model_name(mut self, name: impl Into<String>) -> Self {
        self.model_name = name.into();
        self
    }

    /// Get the number of times `complete` or `complete_with_tools` was called.
    pub fn calls(&self) -> u32 {
        self.call_count.load(Ordering::Relaxed)
    }

    /// Attach a fault injector for fine-grained failure control.
    ///
    /// When set, the injector's `next_action()` is consulted on every call,
    /// taking precedence over the `should_fail` / `error_kind` fields.
    pub fn with_fault_injector(mut self, injector: Arc<fault_injection::FaultInjector>) -> Self {
        self.fault_injector = Some(injector);
        self
    }

    /// Toggle whether calls should fail at runtime.
    pub fn set_failing(&self, fail: bool) {
        self.should_fail.store(fail, Ordering::Relaxed);
    }

    /// Check the fault injector or should_fail flag, returning an error if
    /// the call should fail, or None if it should succeed.
    async fn check_faults(&self) -> Option<LlmError> {
        if let Some(ref injector) = self.fault_injector {
            match injector.next_action() {
                fault_injection::FaultAction::Fail(fault) => {
                    return Some(fault.to_llm_error(&self.model_name));
                }
                fault_injection::FaultAction::Delay(duration) => {
                    tokio::time::sleep(duration).await;
                }
                fault_injection::FaultAction::Succeed => {}
            }
        } else if self.should_fail.load(Ordering::Relaxed) {
            return Some(self.make_error());
        }
        None
    }

    fn make_error(&self) -> LlmError {
        match self.error_kind {
            StubErrorKind::Transient => LlmError::RequestFailed {
                provider: self.model_name.clone(),
                reason: "server error".to_string(),
            },
            StubErrorKind::NonTransient => LlmError::ContextLengthExceeded {
                used: 100_000,
                limit: 50_000,
            },
        }
    }
}

impl Default for StubLlm {
    fn default() -> Self {
        Self::new("OK")
    }
}

#[async_trait]
impl LlmProvider for StubLlm {
    fn model_name(&self) -> &str {
        &self.model_name
    }

    fn cost_per_token(&self) -> (Decimal, Decimal) {
        (Decimal::ZERO, Decimal::ZERO)
    }

    async fn complete(&self, _request: CompletionRequest) -> Result<CompletionResponse, LlmError> {
        self.call_count.fetch_add(1, Ordering::Relaxed);
        if let Some(err) = self.check_faults().await {
            return Err(err);
        }
        Ok(CompletionResponse {
            content: self.response.clone(),
            input_tokens: 10,
            output_tokens: 5,
            finish_reason: FinishReason::Stop,
            cache_read_input_tokens: 0,
            cache_creation_input_tokens: 0,
        })
    }

    async fn complete_with_tools(
        &self,
        _request: ToolCompletionRequest,
    ) -> Result<ToolCompletionResponse, LlmError> {
        self.call_count.fetch_add(1, Ordering::Relaxed);
        if let Some(err) = self.check_faults().await {
            return Err(err);
        }
        Ok(ToolCompletionResponse {
            content: Some(self.response.clone()),
            tool_calls: Vec::new(),
            input_tokens: 10,
            output_tokens: 5,
            finish_reason: FinishReason::Stop,
            cache_read_input_tokens: 0,
            cache_creation_input_tokens: 0,
        })
    }
}

/// A configurable channel stub for tests.
///
/// Supports:
/// - Message injection via the returned `mpsc::Sender`
/// - Response capture for assertion
/// - Status update capture
/// - Configurable health check failure
///
/// # Usage
///
/// ```rust,no_run
/// let (channel, sender) = StubChannel::new("test");
/// sender.send(IncomingMessage::new("test", "user1", "hello")).await.unwrap();
/// // ... run agent logic that calls channel.respond() ...
/// let responses = channel.captured_responses();
/// ```
pub struct StubChannel {
    name: String,
    rx: tokio::sync::Mutex<Option<mpsc::Receiver<IncomingMessage>>>,
    responses: Arc<Mutex<Vec<(IncomingMessage, OutgoingResponse)>>>,
    statuses: Arc<Mutex<Vec<StatusUpdate>>>,
    healthy: AtomicBool,
}

impl StubChannel {
    /// Create a new stub channel and its message sender.
    ///
    /// The sender is used by tests to inject messages into the channel's stream.
    /// The channel captures all responses and status updates for later assertion.
    pub fn new(name: impl Into<String>) -> (Self, mpsc::Sender<IncomingMessage>) {
        let (tx, rx) = mpsc::channel(64);
        let channel = Self {
            name: name.into(),
            rx: tokio::sync::Mutex::new(Some(rx)),
            responses: Arc::new(Mutex::new(Vec::new())),
            statuses: Arc::new(Mutex::new(Vec::new())),
            healthy: AtomicBool::new(true),
        };
        (channel, tx)
    }

    /// Get all captured (message, response) pairs.
    pub fn captured_responses(&self) -> Vec<(IncomingMessage, OutgoingResponse)> {
        self.responses.lock().expect("poisoned").clone()
    }

    /// Get a shared handle to the response capture list.
    ///
    /// Call this *before* moving the channel into a `ChannelManager`,
    /// since `add()` takes ownership.
    pub fn captured_responses_handle(
        &self,
    ) -> Arc<Mutex<Vec<(IncomingMessage, OutgoingResponse)>>> {
        Arc::clone(&self.responses)
    }

    /// Get all captured status updates.
    pub fn captured_statuses(&self) -> Vec<StatusUpdate> {
        self.statuses.lock().expect("poisoned").clone()
    }

    /// Get a shared handle to the status capture list.
    pub fn captured_statuses_handle(&self) -> Arc<Mutex<Vec<StatusUpdate>>> {
        Arc::clone(&self.statuses)
    }

    /// Set whether `health_check()` succeeds or fails.
    pub fn set_healthy(&self, healthy: bool) {
        self.healthy.store(healthy, Ordering::Relaxed);
    }
}

#[async_trait]
impl Channel for StubChannel {
    fn name(&self) -> &str {
        &self.name
    }

    async fn start(&self) -> Result<MessageStream, ChannelError> {
        let rx = self
            .rx
            .lock()
            .await
            .take()
            .ok_or_else(|| ChannelError::StartupFailed {
                name: self.name.clone(),
                reason: "start() already called".to_string(),
            })?;
        let stream = tokio_stream::wrappers::ReceiverStream::new(rx);
        Ok(Box::pin(stream))
    }

    async fn respond(
        &self,
        msg: &IncomingMessage,
        response: OutgoingResponse,
    ) -> Result<(), ChannelError> {
        self.responses
            .lock()
            .expect("poisoned")
            .push((msg.clone(), response));
        Ok(())
    }

    async fn send_status(
        &self,
        status: StatusUpdate,
        _metadata: &serde_json::Value,
    ) -> Result<(), ChannelError> {
        self.statuses.lock().expect("poisoned").push(status);
        Ok(())
    }

    async fn health_check(&self) -> Result<(), ChannelError> {
        if self.healthy.load(Ordering::Relaxed) {
            Ok(())
        } else {
            Err(ChannelError::HealthCheckFailed {
                name: self.name.clone(),
            })
        }
    }
}

/// Assembled test components.
pub struct TestHarness {
    /// The agent dependencies, ready for use.
    pub deps: AgentDeps,
    /// Direct reference to the database (as `Arc<dyn Database>`).
    pub db: Arc<dyn Database>,
    /// Stub channel sender + manager, present if `with_stub_channel()` was called.
    pub channel: Option<(mpsc::Sender<IncomingMessage>, ChannelManager)>,
    /// Temp directory guard — keeps the test database alive. Dropped
    /// automatically when the harness goes out of scope.
    #[cfg(feature = "libsql")]
    _temp_dir: tempfile::TempDir,
}

/// Builder for constructing a [`TestHarness`] with sensible defaults.
///
/// All defaults are designed to work without any external services:
/// - Database: libSQL in a temp directory (real SQL, FTS5, no network)
/// - LLM: `StubLlm` returning "OK"
/// - Safety: permissive config
/// - Tools: builtin tools registered
/// - Hooks: empty registry
/// - Cost guard: no limits
pub struct TestHarnessBuilder {
    db: Option<Arc<dyn Database>>,
    llm: Option<Arc<dyn LlmProvider>>,
    tools: Option<Arc<ToolRegistry>>,
    stub_channel: bool,
}

impl TestHarnessBuilder {
    /// Create a new builder with all defaults.
    pub fn new() -> Self {
        Self {
            db: None,
            llm: None,
            tools: None,
            stub_channel: false,
        }
    }

    /// Override the database backend.
    pub fn with_db(mut self, db: Arc<dyn Database>) -> Self {
        self.db = Some(db);
        self
    }

    /// Override the LLM provider.
    pub fn with_llm(mut self, llm: Arc<dyn LlmProvider>) -> Self {
        self.llm = Some(llm);
        self
    }

    /// Override the tool registry.
    pub fn with_tools(mut self, tools: Arc<ToolRegistry>) -> Self {
        self.tools = Some(tools);
        self
    }

    /// Include a `StubChannel` wired into a `ChannelManager`.
    ///
    /// The harness will expose the sender (for injecting messages) and
    /// the manager (for routing responses) via [`TestHarness::channel`].
    pub fn with_stub_channel(mut self) -> Self {
        self.stub_channel = true;
        self
    }

    /// Build the harness with defaults applied.
    #[cfg(feature = "libsql")]
    pub async fn build(self) -> TestHarness {
        use crate::agent::cost_guard::{CostGuard, CostGuardConfig};
        use crate::config::{SafetyConfig, SkillsConfig};
        use crate::hooks::HookRegistry;
        use crate::safety::SafetyLayer;

        let (db, temp_dir) = if let Some(db) = self.db {
            // Caller provided a DB; create a dummy temp dir to satisfy the struct.
            let dir = tempfile::tempdir().expect("failed to create temp dir");
            (db, dir)
        } else {
            test_db().await
        };

        let llm: Arc<dyn LlmProvider> = self.llm.unwrap_or_else(|| Arc::new(StubLlm::default()));

        let tools = self.tools.unwrap_or_else(|| {
            let t = Arc::new(ToolRegistry::new());
            t.register_builtin_tools();
            t
        });

        let safety = Arc::new(SafetyLayer::new(&SafetyConfig {
            max_output_length: 100_000,
            injection_check_enabled: false,
        }));

        let hooks = Arc::new(HookRegistry::new());

        let cost_guard = Arc::new(CostGuard::new(CostGuardConfig {
            max_cost_per_day_cents: None,
            max_actions_per_hour: None,
        }));

        let channel = if self.stub_channel {
            let (stub, sender) = StubChannel::new("stub");
            let manager = ChannelManager::new();
            manager.add(Box::new(stub)).await;
            Some((sender, manager))
        } else {
            None
        };

        let deps = AgentDeps {
            owner_id: "default".to_string(),
            store: Some(Arc::clone(&db)),
            llm,
            cheap_llm: None,
            safety,
            tools,
            workspace: None,
            extension_manager: None,
            skill_registry: None,
            skill_catalog: None,
            skills_config: SkillsConfig::default(),
            hooks,
            cost_guard,
            sse_tx: None,
            http_interceptor: None,
            transcription: None,
            document_extraction: None,
        };

        TestHarness {
            deps,
            db,
            channel,
            _temp_dir: temp_dir,
        }
    }
}

impl Default for TestHarnessBuilder {
    fn default() -> Self {
        Self::new()
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_harness_builds_with_defaults() {
        let harness = TestHarnessBuilder::new().build().await;
        assert!(harness.deps.store.is_some());
        assert_eq!(harness.deps.llm.model_name(), "stub-model");
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_harness_custom_llm() {
        let custom_llm = Arc::new(StubLlm::new("custom response").with_model_name("my-model"));
        let harness = TestHarnessBuilder::new().with_llm(custom_llm).build().await;
        assert_eq!(harness.deps.llm.model_name(), "my-model");
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_harness_db_works() {
        let harness = TestHarnessBuilder::new().build().await;

        let id = harness
            .db
            .create_conversation("test", "user1", None)
            .await
            .expect("create conversation");
        assert!(!id.is_nil());
    }

    // === QA Plan P1 - 2.2: Turn persistence round-trip tests ===

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_conversation_message_round_trip() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let conv_id = db
            .create_conversation("tui", "alice", None)
            .await
            .expect("create conversation");

        // Add several messages in order.
        let m1 = db
            .add_conversation_message(conv_id, "user", "Hello!")
            .await
            .expect("add msg 1");
        let m2 = db
            .add_conversation_message(conv_id, "assistant", "Hi there!")
            .await
            .expect("add msg 2");
        let m3 = db
            .add_conversation_message(conv_id, "user", "How are you?")
            .await
            .expect("add msg 3");

        // IDs must be unique.
        assert_ne!(m1, m2);
        assert_ne!(m2, m3);

        // List messages and verify content + ordering.
        let msgs = db
            .list_conversation_messages(conv_id)
            .await
            .expect("list messages");
        assert_eq!(msgs.len(), 3);
        assert_eq!(msgs[0].role, "user");
        assert_eq!(msgs[0].content, "Hello!");
        assert_eq!(msgs[1].role, "assistant");
        assert_eq!(msgs[1].content, "Hi there!");
        assert_eq!(msgs[2].role, "user");
        assert_eq!(msgs[2].content, "How are you?");

        // Timestamps should be monotonically non-decreasing.
        assert!(msgs[0].created_at <= msgs[1].created_at);
        assert!(msgs[1].created_at <= msgs[2].created_at);
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_conversation_metadata_persistence() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let conv_id = db
            .create_conversation("web", "bob", None)
            .await
            .expect("create conversation");

        // Initially no metadata.
        let meta = db
            .get_conversation_metadata(conv_id)
            .await
            .expect("get metadata");
        // May be None or empty object depending on backend.
        if let Some(m) = &meta {
            assert!(m.is_null() || m.as_object().is_none_or(|o| o.is_empty()));
        }

        // Set a metadata field.
        db.update_conversation_metadata_field(
            conv_id,
            "thread_type",
            &serde_json::json!("assistant"),
        )
        .await
        .expect("set thread_type");

        // Read it back.
        let meta = db
            .get_conversation_metadata(conv_id)
            .await
            .expect("get metadata after update")
            .expect("metadata should exist");
        assert_eq!(meta["thread_type"], "assistant");

        // Update with a second field — first field should still be there.
        db.update_conversation_metadata_field(conv_id, "model", &serde_json::json!("gpt-4"))
            .await
            .expect("set model");

        let meta = db
            .get_conversation_metadata(conv_id)
            .await
            .expect("get metadata after second update")
            .expect("metadata should exist");
        assert_eq!(meta["thread_type"], "assistant");
        assert_eq!(meta["model"], "gpt-4");
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_conversation_belongs_to_user() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let conv_id = db
            .create_conversation("tui", "alice", None)
            .await
            .expect("create conversation");

        // Owner check should pass.
        assert!(
            db.conversation_belongs_to_user(conv_id, "alice")
                .await
                .expect("belongs check")
        );

        // Different user should NOT own it.
        assert!(
            !db.conversation_belongs_to_user(conv_id, "mallory")
                .await
                .expect("belongs check other user")
        );
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_ensure_conversation_idempotent() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let conv_id = uuid::Uuid::new_v4();

        // ensure_conversation should create the row.
        assert!(
            db.ensure_conversation(conv_id, "web", "carol", None)
                .await
                .expect("ensure first"),
            "first ensure_conversation should create the row"
        );

        // Calling again with the same ID should not error.
        assert!(
            db.ensure_conversation(conv_id, "web", "carol", None)
                .await
                .expect("ensure second (idempotent)"),
            "second ensure_conversation should touch owned row"
        );

        // Should be able to add messages to it.
        let msg_id = db
            .add_conversation_message(conv_id, "user", "test message")
            .await
            .expect("add message to ensured conversation");
        assert!(!msg_id.is_nil());

        // Verify the message is there.
        let msgs = db
            .list_conversation_messages(conv_id)
            .await
            .expect("list messages");
        assert_eq!(msgs.len(), 1);
        assert_eq!(msgs[0].content, "test message");
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_ensure_conversation_foreign_conflict_does_not_touch_last_activity() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let conv_id = db
            .create_conversation("web", "alice", None)
            .await
            .expect("create conversation");

        let before = db
            .list_conversations_all_channels("alice", 10)
            .await
            .expect("list conversations before foreign ensure")
            .into_iter()
            .find(|c| c.id == conv_id)
            .expect("conversation must exist before foreign ensure")
            .last_activity;

        tokio::time::sleep(std::time::Duration::from_millis(25)).await;

        assert!(
            !db.ensure_conversation(conv_id, "web", "mallory", None)
                .await
                .expect("foreign ensure should not error"),
            "foreign ensure_conversation should report not ensured"
        );

        let after = db
            .list_conversations_all_channels("alice", 10)
            .await
            .expect("list conversations after foreign ensure")
            .into_iter()
            .find(|c| c.id == conv_id)
            .expect("conversation must still exist after foreign ensure")
            .last_activity;

        assert_eq!(
            after, before,
            "foreign ensure_conversation should not mutate last_activity"
        );
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_paginated_messages() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let conv_id = db
            .create_conversation("tui", "dave", None)
            .await
            .expect("create conversation");

        // Add messages.
        for i in 0..5 {
            db.add_conversation_message(conv_id, "user", &format!("msg {i}"))
                .await
                .expect("add message");
        }

        // First page with limit 3, no cursor. Returns newest-first.
        let (page1, has_more) = db
            .list_conversation_messages_paginated(conv_id, None, 3)
            .await
            .expect("page 1");
        assert_eq!(page1.len(), 3, "first page should have 3 messages");
        assert!(has_more, "should indicate more messages exist");

        // Verify all messages can be retrieved with a large limit.
        let (all, _) = db
            .list_conversation_messages_paginated(conv_id, None, 100)
            .await
            .expect("all messages");
        assert_eq!(all.len(), 5);

        // Messages are returned oldest-first (ascending created_at).
        for w in all.windows(2) {
            assert!(
                w[0].created_at <= w[1].created_at,
                "messages should be in ascending created_at order"
            );
        }
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_conversations_with_preview() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        // Create two conversations for the same user.
        let c1 = db
            .create_conversation("tui", "eve", None)
            .await
            .expect("create c1");
        db.add_conversation_message(c1, "user", "First conversation opener")
            .await
            .expect("add msg to c1");

        let c2 = db
            .create_conversation("tui", "eve", None)
            .await
            .expect("create c2");
        db.add_conversation_message(c2, "user", "Second conversation opener")
            .await
            .expect("add msg to c2");

        // List with preview.
        let summaries = db
            .list_conversations_with_preview("eve", "tui", 10)
            .await
            .expect("list with preview");

        assert_eq!(summaries.len(), 2);
        // Both should have message_count >= 1.
        for s in &summaries {
            assert!(s.message_count >= 1);
        }
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_job_action_persistence() {
        use crate::context::{ActionRecord, JobContext, JobState};

        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let ctx = JobContext::with_user("user1", "Do something", "test task");

        let job_id = ctx.job_id;

        // Save job.
        db.save_job(&ctx).await.expect("save job");

        // Get job back.
        let fetched = db.get_job(job_id).await.expect("get job");
        assert!(fetched.is_some());
        let fetched = fetched.unwrap();
        assert_eq!(fetched.job_id, job_id);

        // Save an action.
        let action = ActionRecord {
            id: uuid::Uuid::new_v4(),
            sequence: 1,
            tool_name: "echo".to_string(),
            input: serde_json::json!({"message": "hello"}),
            output_raw: Some("hello".to_string()),
            output_sanitized: None,
            sanitization_warnings: vec![],
            cost: None,
            duration: std::time::Duration::from_millis(42),
            success: true,
            error: None,
            executed_at: chrono::Utc::now(),
        };
        db.save_action(job_id, &action).await.expect("save action");

        // Retrieve actions.
        let actions = db.get_job_actions(job_id).await.expect("get actions");
        assert_eq!(actions.len(), 1);
        assert_eq!(actions[0].tool_name, "echo");
        assert_eq!(actions[0].output_raw, Some("hello".to_string()));
        assert!(actions[0].success);
        assert_eq!(actions[0].duration, std::time::Duration::from_millis(42));

        // Update job status.
        db.update_job_status(job_id, JobState::Completed, None)
            .await
            .expect("update status");

        let updated = db
            .get_job(job_id)
            .await
            .expect("get updated job")
            .expect("job should exist");
        assert!(matches!(updated.state, JobState::Completed));
    }

    #[tokio::test]
    async fn test_stub_llm_complete() {
        let llm = StubLlm::new("hello world");
        let response = llm
            .complete(CompletionRequest::new(vec![]))
            .await
            .expect("complete");
        assert_eq!(response.content, "hello world");
        assert_eq!(response.finish_reason, FinishReason::Stop);
    }

    #[tokio::test]
    async fn test_stub_channel_inject_and_capture() {
        use futures::StreamExt;

        let (channel, sender) = StubChannel::new("test-channel");

        // Start the channel to get the message stream
        let mut stream = channel.start().await.expect("start failed");

        // Inject a message
        sender
            .send(IncomingMessage::new("test-channel", "user1", "hello"))
            .await
            .expect("send failed");

        // Read it from the stream
        let msg = stream.next().await.expect("stream ended");
        assert_eq!(msg.content, "hello");
        assert_eq!(msg.user_id, "user1");
        assert_eq!(msg.channel, "test-channel");

        // Send a response and verify it was captured
        let response = OutgoingResponse::text("world");
        channel
            .respond(&msg, response)
            .await
            .expect("respond failed");

        let captured = channel.captured_responses();
        assert_eq!(captured.len(), 1);
        assert_eq!(captured[0].1.content, "world");
    }

    #[tokio::test]
    async fn test_stub_channel_health_check() {
        let (channel, _sender) = StubChannel::new("healthy");
        channel.health_check().await.expect("health check failed");

        channel.set_healthy(false);
        assert!(channel.health_check().await.is_err());
    }

    // === Database CRUD coverage for untested trait methods ===

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_settings_crud() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        // Initially no setting
        let val = db.get_setting("user1", "theme").await.expect("get");
        assert!(val.is_none());

        // Set a value
        db.set_setting("user1", "theme", &serde_json::json!("dark"))
            .await
            .expect("set");

        // Read it back
        let val = db
            .get_setting("user1", "theme")
            .await
            .expect("get")
            .expect("should exist");
        assert_eq!(val, serde_json::json!("dark"));

        // Update it
        db.set_setting("user1", "theme", &serde_json::json!("light"))
            .await
            .expect("set update");
        let val = db
            .get_setting("user1", "theme")
            .await
            .expect("get")
            .expect("should exist");
        assert_eq!(val, serde_json::json!("light"));

        // List settings
        let all = db.list_settings("user1").await.expect("list");
        assert_eq!(all.len(), 1);

        // Delete
        let deleted = db.delete_setting("user1", "theme").await.expect("delete");
        assert!(deleted);

        let val = db.get_setting("user1", "theme").await.expect("get");
        assert!(val.is_none());

        // Delete non-existent
        let deleted = db.delete_setting("user1", "theme").await.expect("delete");
        assert!(!deleted);
    }

    #[tokio::test]
    async fn test_harness_with_channel() {
        let harness = TestHarnessBuilder::new().with_stub_channel().build().await;

        let (sender, channel_manager) =
            harness.channel.as_ref().expect("channel should be present");

        // Inject a message via sender
        sender
            .send(IncomingMessage::new("stub", "user1", "test message"))
            .await
            .expect("send failed");

        // Verify channel is registered in the manager
        let names = channel_manager.channel_names().await;
        assert!(names.contains(&"stub".to_string()));
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_settings_bulk_operations() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        // Initially no settings
        let has = db.has_settings("bulk_user").await.expect("has_settings");
        assert!(!has);

        // Set all settings at once
        let mut settings = std::collections::HashMap::new();
        settings.insert("key1".to_string(), serde_json::json!("value1"));
        settings.insert("key2".to_string(), serde_json::json!(42));
        db.set_all_settings("bulk_user", &settings)
            .await
            .expect("set_all");

        // Has settings should now be true
        let has = db.has_settings("bulk_user").await.expect("has_settings");
        assert!(has);

        // Get all settings
        let all = db.get_all_settings("bulk_user").await.expect("get_all");
        assert_eq!(all.len(), 2);
        assert_eq!(all["key1"], serde_json::json!("value1"));
        assert_eq!(all["key2"], serde_json::json!(42));

        // Get full setting row
        let full = db
            .get_setting_full("bulk_user", "key1")
            .await
            .expect("get_full")
            .expect("should exist");
        assert_eq!(full.key, "key1");
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_tool_failure_tracking() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        // Record some failures
        db.record_tool_failure("bad_tool", "connection refused")
            .await
            .expect("record 1");
        db.record_tool_failure("bad_tool", "timeout")
            .await
            .expect("record 2");
        db.record_tool_failure("bad_tool", "parse error")
            .await
            .expect("record 3");

        // Get broken tools (threshold = 2, should include bad_tool with 3 failures)
        let broken = db.get_broken_tools(2).await.expect("get broken");
        assert!(!broken.is_empty());
        let found = broken.iter().find(|b| b.name == "bad_tool");
        assert!(found.is_some(), "bad_tool should be in broken tools list");

        // Mark as repaired
        db.mark_tool_repaired("bad_tool")
            .await
            .expect("mark repaired");
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_routine_crud() {
        use crate::agent::routine::{
            NotifyConfig, Routine, RoutineAction, RoutineGuardrails, RoutineRun, RunStatus, Trigger,
        };

        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let routine_id = uuid::Uuid::new_v4();
        let routine = Routine {
            id: routine_id,
            name: "test-routine".to_string(),
            description: "A test routine".to_string(),
            user_id: "user1".to_string(),
            enabled: true,
            trigger: Trigger::Cron {
                schedule: "0 * * * *".to_string(),
                timezone: None,
            },
            action: RoutineAction::Lightweight {
                prompt: "Check status".to_string(),
                context_paths: vec![],
                max_tokens: 500,
                use_tools: false,
                max_tool_rounds: 3,
            },
            guardrails: RoutineGuardrails {
                cooldown: std::time::Duration::from_secs(60),
                max_concurrent: 1,
                dedup_window: None,
            },
            notify: NotifyConfig {
                channel: None,
                user: Some("user1".to_string()),
                on_attention: true,
                on_failure: true,
                on_success: false,
            },
            last_run_at: None,
            next_fire_at: None,
            run_count: 0,
            consecutive_failures: 0,
            state: serde_json::json!({}),
            created_at: chrono::Utc::now(),
            updated_at: chrono::Utc::now(),
        };

        // Create
        db.create_routine(&routine).await.expect("create routine");

        // Get by ID
        let fetched = db
            .get_routine(routine_id)
            .await
            .expect("get routine")
            .expect("should exist");
        assert_eq!(fetched.name, "test-routine");
        assert!(fetched.enabled);

        // Get by name
        let by_name = db
            .get_routine_by_name("user1", "test-routine")
            .await
            .expect("get by name")
            .expect("should exist");
        assert_eq!(by_name.id, routine_id);

        // List routines for user
        let list = db.list_routines("user1").await.expect("list routines");
        assert_eq!(list.len(), 1);

        // List all routines
        let all = db.list_all_routines().await.expect("list all");
        assert!(!all.is_empty());

        // Update routine (disable + change description)
        let mut updated = fetched;
        updated.enabled = false;
        updated.description = "Updated description".to_string();
        db.update_routine(&updated).await.expect("update routine");

        let re_fetched = db
            .get_routine(routine_id)
            .await
            .expect("get")
            .expect("exists");
        assert!(!re_fetched.enabled);
        assert_eq!(re_fetched.description, "Updated description");

        // Create a routine run
        let run_id = uuid::Uuid::new_v4();
        let run = RoutineRun {
            id: run_id,
            routine_id,
            trigger_type: "cron".to_string(),
            trigger_detail: Some("0 * * * *".to_string()),
            started_at: chrono::Utc::now(),
            completed_at: None,
            status: RunStatus::Running,
            result_summary: None,
            tokens_used: None,
            job_id: None,
            created_at: chrono::Utc::now(),
        };
        db.create_routine_run(&run).await.expect("create run");

        // List runs
        let runs = db
            .list_routine_runs(routine_id, 10)
            .await
            .expect("list runs");
        assert_eq!(runs.len(), 1);
        assert!(matches!(runs[0].status, RunStatus::Running));

        // Complete the run
        db.complete_routine_run(run_id, RunStatus::Ok, Some("All good"), Some(150))
            .await
            .expect("complete run");

        let runs = db
            .list_routine_runs(routine_id, 10)
            .await
            .expect("list runs after complete");
        assert!(matches!(runs[0].status, RunStatus::Ok));

        // Delete
        let deleted = db.delete_routine(routine_id).await.expect("delete");
        assert!(deleted);

        // Delete non-existent
        let deleted = db.delete_routine(routine_id).await.expect("delete again");
        assert!(!deleted);
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_routine_runtime_update() {
        use crate::agent::routine::{
            NotifyConfig, Routine, RoutineAction, RoutineGuardrails, Trigger,
        };

        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let routine_id = uuid::Uuid::new_v4();
        let routine = Routine {
            id: routine_id,
            name: "runtime-test".to_string(),
            description: "Test runtime update".to_string(),
            user_id: "user1".to_string(),
            enabled: true,
            trigger: Trigger::Manual,
            action: RoutineAction::Lightweight {
                prompt: "test".to_string(),
                context_paths: vec![],
                max_tokens: 100,
                use_tools: false,
                max_tool_rounds: 3,
            },
            guardrails: RoutineGuardrails {
                cooldown: std::time::Duration::from_secs(0),
                max_concurrent: 1,
                dedup_window: None,
            },
            notify: NotifyConfig {
                channel: None,
                user: Some("user1".to_string()),
                on_attention: false,
                on_failure: false,
                on_success: false,
            },
            last_run_at: None,
            next_fire_at: None,
            run_count: 0,
            consecutive_failures: 0,
            state: serde_json::json!({}),
            created_at: chrono::Utc::now(),
            updated_at: chrono::Utc::now(),
        };
        db.create_routine(&routine).await.expect("create");

        let now = chrono::Utc::now();
        db.update_routine_runtime(
            routine_id,
            now,
            Some(now + chrono::TimeDelta::seconds(3600)),
            5,
            2,
            &serde_json::json!({"last_result": "ok"}),
        )
        .await
        .expect("update runtime");

        let fetched = db
            .get_routine(routine_id)
            .await
            .expect("get")
            .expect("exists");
        assert_eq!(fetched.run_count, 5);
        assert_eq!(fetched.consecutive_failures, 2);
        assert!(fetched.last_run_at.is_some());
        assert!(fetched.next_fire_at.is_some());

        // Cleanup
        db.delete_routine(routine_id).await.expect("delete");
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_llm_call_recording() {
        use crate::history::LlmCallRecord;

        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let record = LlmCallRecord {
            job_id: None,
            conversation_id: None,
            provider: "openai",
            model: "gpt-4",
            input_tokens: 100,
            output_tokens: 50,
            cost: Decimal::new(5, 3), // 0.005
            purpose: Some("test"),
        };

        let call_id = db.record_llm_call(&record).await.expect("record llm call");
        assert!(!call_id.is_nil());
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_sandbox_job_lifecycle() {
        use crate::history::SandboxJobRecord;

        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let job_id = uuid::Uuid::new_v4();
        let job = SandboxJobRecord {
            id: job_id,
            task: "Build a test tool".to_string(),
            status: "creating".to_string(),
            user_id: "user1".to_string(),
            project_dir: "/workspace/test".to_string(),
            success: None,
            failure_reason: None,
            created_at: chrono::Utc::now(),
            started_at: None,
            completed_at: None,
            credential_grants_json: "[]".to_string(),
        };

        // Create
        db.save_sandbox_job(&job).await.expect("save sandbox job");

        // Get
        let fetched = db
            .get_sandbox_job(job_id)
            .await
            .expect("get")
            .expect("should exist");
        assert_eq!(fetched.task, "Build a test tool");
        assert_eq!(fetched.status, "creating");

        // Update status to running
        db.update_sandbox_job_status(
            job_id,
            "running",
            None,
            None,
            Some(chrono::Utc::now()),
            None,
        )
        .await
        .expect("update to running");

        // Update to completed
        db.update_sandbox_job_status(
            job_id,
            "completed",
            Some(true),
            Some("Done"),
            None,
            Some(chrono::Utc::now()),
        )
        .await
        .expect("update to completed");

        let fetched = db
            .get_sandbox_job(job_id)
            .await
            .expect("get")
            .expect("should exist");
        assert_eq!(fetched.status, "completed");
        assert_eq!(fetched.success, Some(true));

        // List
        let all = db.list_sandbox_jobs().await.expect("list");
        assert!(!all.is_empty());

        // Summary
        let summary = db.sandbox_job_summary().await.expect("summary");
        assert!(summary.total >= 1);

        // Per-user list
        let user_jobs = db
            .list_sandbox_jobs_for_user("user1")
            .await
            .expect("user list");
        assert!(!user_jobs.is_empty());

        // Ownership check
        let belongs = db
            .sandbox_job_belongs_to_user(job_id, "user1")
            .await
            .expect("belongs check");
        assert!(belongs);
        let not_belongs = db
            .sandbox_job_belongs_to_user(job_id, "other_user")
            .await
            .expect("belongs check");
        assert!(!not_belongs);
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_sandbox_job_mode() {
        use crate::history::SandboxJobRecord;

        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        let job_id = uuid::Uuid::new_v4();
        let job = SandboxJobRecord {
            id: job_id,
            task: "Mode test".to_string(),
            status: "creating".to_string(),
            user_id: "user1".to_string(),
            project_dir: "/workspace".to_string(),
            success: None,
            failure_reason: None,
            created_at: chrono::Utc::now(),
            started_at: None,
            completed_at: None,
            credential_grants_json: "[]".to_string(),
        };
        db.save_sandbox_job(&job).await.expect("save");

        // Default mode
        let mode = db.get_sandbox_job_mode(job_id).await.expect("get mode");
        // Default is "worker" per schema or NULL
        assert!(mode.is_none() || mode.as_deref() == Some("worker"));

        // Update mode
        db.update_sandbox_job_mode(job_id, "claude_code")
            .await
            .expect("update mode");
        let mode = db
            .get_sandbox_job_mode(job_id)
            .await
            .expect("get mode")
            .expect("should have mode");
        assert_eq!(mode, "claude_code");
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_job_events() {
        use crate::history::SandboxJobRecord;

        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        // Create a sandbox job first (foreign key)
        let job_id = uuid::Uuid::new_v4();
        let job = SandboxJobRecord {
            id: job_id,
            task: "Event test".to_string(),
            status: "running".to_string(),
            user_id: "user1".to_string(),
            project_dir: "/workspace".to_string(),
            success: None,
            failure_reason: None,
            created_at: chrono::Utc::now(),
            started_at: Some(chrono::Utc::now()),
            completed_at: None,
            credential_grants_json: "[]".to_string(),
        };
        db.save_sandbox_job(&job).await.expect("save job");

        // Save events
        db.save_job_event(
            job_id,
            "tool_call",
            &serde_json::json!({"tool": "shell", "args": {"command": "ls"}}),
        )
        .await
        .expect("save event 1");

        db.save_job_event(
            job_id,
            "tool_result",
            &serde_json::json!({"output": "file1.txt\nfile2.txt"}),
        )
        .await
        .expect("save event 2");

        db.save_job_event(
            job_id,
            "llm_response",
            &serde_json::json!({"content": "Found 2 files"}),
        )
        .await
        .expect("save event 3");

        // List all events
        let events = db.list_job_events(job_id, None).await.expect("list events");
        assert_eq!(events.len(), 3);

        // List with limit
        let events = db
            .list_job_events(job_id, Some(2))
            .await
            .expect("list events limited");
        assert_eq!(events.len(), 2);
    }

    #[cfg(feature = "libsql")]
    #[tokio::test]
    async fn test_estimation_snapshot_round_trip() {
        let harness = TestHarnessBuilder::new().build().await;
        let db = &harness.db;

        // Create a job first
        let job_ctx = crate::context::JobContext::with_user("user1", "Estimate test", "testing");
        let job_id = job_ctx.job_id;
        db.save_job(&job_ctx).await.expect("save job");

        // Save estimation snapshot
        let snap_id = db
            .save_estimation_snapshot(
                job_id,
                "code_generation",
                &["shell".to_string(), "write_file".to_string()],
                Decimal::new(50, 2), // 0.50
                120,
                Decimal::new(500, 2), // 5.00
            )
            .await
            .expect("save snapshot");
        assert!(!snap_id.is_nil());

        // Update with actuals
        db.update_estimation_actuals(
            snap_id,
            Decimal::new(45, 2), // 0.45
            110,
            Some(Decimal::new(600, 2)), // 6.00
        )
        .await
        .expect("update actuals");
    }

    #[tokio::test]
    async fn stub_llm_fault_injector_sequence() {
        use crate::llm::LlmProvider;
        use crate::testing::fault_injection::{FaultAction, FaultInjector, FaultType};

        let injector = Arc::new(FaultInjector::sequence([
            FaultAction::Fail(FaultType::RateLimited { retry_after: None }),
            FaultAction::Succeed,
        ]));

        let stub = StubLlm::new("hello").with_fault_injector(injector);

        let req = crate::llm::CompletionRequest::new(vec![crate::llm::ChatMessage::user("hi")]);

        // First call should fail with RateLimited
        let result = stub.complete(req.clone()).await;
        assert!(result.is_err());
        assert!(matches!(result.unwrap_err(), LlmError::RateLimited { .. }));

        // Second call should succeed
        let result = stub.complete(req).await;
        assert!(result.is_ok());
        assert_eq!(result.unwrap().content, "hello");
    }
}