"""pytest fixtures for E2E tests.

Session-scoped: build binary, start mock LLM, start ironclaw, launch browser.
Function-scoped: fresh browser context and page per test.
"""

import asyncio
import os
import signal
import socket
import subprocess
import sys
import tempfile
from pathlib import Path

import pytest

from helpers import AUTH_TOKEN, wait_for_port_line, wait_for_ready

# Project root (two levels up from tests/e2e/)
ROOT = Path(__file__).resolve().parent.parent.parent

# Temp directory for the libSQL database file (cleaned up automatically)
_DB_TMPDIR = tempfile.TemporaryDirectory(prefix="ironclaw-e2e-")


def _find_free_port() -> int:
    """Bind to port 0 and return the OS-assigned port."""
    with socket.socket(socket.AF_INET, socket.SOCK_STREAM) as s:
        s.bind(("127.0.0.1", 0))
        return s.getsockname()[1]


@pytest.fixture(scope="session")
def ironclaw_binary():
    """Ensure ironclaw binary is built. Returns the binary path."""
    binary = ROOT / "target" / "debug" / "ironclaw"
    if not binary.exists():
        print("Building ironclaw (this may take a while)...")
        subprocess.run(
            ["cargo", "build", "--no-default-features", "--features", "libsql"],
            cwd=ROOT,
            check=True,
            timeout=600,
        )
    assert binary.exists(), f"Binary not found at {binary}"
    return str(binary)


@pytest.fixture(scope="session")
async def mock_llm_server():
    """Start the mock LLM server. Yields the base URL."""
    server_script = Path(__file__).parent / "mock_llm.py"
    proc = await asyncio.create_subprocess_exec(
        sys.executable, str(server_script), "--port", "0",
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
    )
    try:
        port = await wait_for_port_line(proc, r"MOCK_LLM_PORT=(\d+)", timeout=10)
        url = f"http://127.0.0.1:{port}"
        await wait_for_ready(f"{url}/v1/models", timeout=10)
        yield url
    finally:
        proc.send_signal(signal.SIGTERM)
        try:
            await asyncio.wait_for(proc.wait(), timeout=5)
        except asyncio.TimeoutError:
            proc.kill()


@pytest.fixture(scope="session")
async def ironclaw_server(ironclaw_binary, mock_llm_server):
    """Start the ironclaw gateway. Yields the base URL."""
    gateway_port = _find_free_port()
    env = {
        # Minimal env: PATH for process spawning, HOME for Rust/cargo defaults
        "PATH": os.environ.get("PATH", "/usr/bin:/bin"),
        "HOME": os.environ.get("HOME", "/tmp"),
        "RUST_LOG": "ironclaw=info",
        "RUST_BACKTRACE": "1",
        "GATEWAY_ENABLED": "true",
        "GATEWAY_HOST": "127.0.0.1",
        "GATEWAY_PORT": str(gateway_port),
        "GATEWAY_AUTH_TOKEN": AUTH_TOKEN,
        "GATEWAY_USER_ID": "e2e-tester",
        "CLI_ENABLED": "false",
        "LLM_BACKEND": "openai_compatible",
        "LLM_BASE_URL": mock_llm_server,
        "LLM_MODEL": "mock-model",
        "DATABASE_BACKEND": "libsql",
        "LIBSQL_PATH": os.path.join(_DB_TMPDIR.name, "e2e.db"),
        "SANDBOX_ENABLED": "false",
        "SKILLS_ENABLED": "true",
        "ROUTINES_ENABLED": "false",
        "HEARTBEAT_ENABLED": "false",
        "EMBEDDING_ENABLED": "false",
        # Prevent onboarding wizard from triggering
        "ONBOARD_COMPLETED": "true",
    }
    # Forward LLVM coverage instrumentation env vars when present
    # (allows cargo-llvm-cov to collect profraw data from E2E runs).
    # Use prefix matching to stay resilient to cargo-llvm-cov changes.
    COV_ENV_PREFIXES = ("CARGO_LLVM_COV", "LLVM_")
    COV_ENV_EXTRAS = ("CARGO_ENCODED_RUSTFLAGS", "CARGO_INCREMENTAL")
    for key, val in os.environ.items():
        if key.startswith(COV_ENV_PREFIXES) or key in COV_ENV_EXTRAS:
            env[key] = val
    proc = await asyncio.create_subprocess_exec(
        ironclaw_binary, "--no-onboard",
        stdin=asyncio.subprocess.DEVNULL,
        stdout=asyncio.subprocess.PIPE,
        stderr=asyncio.subprocess.PIPE,
        env=env,
    )
    base_url = f"http://127.0.0.1:{gateway_port}"
    try:
        await wait_for_ready(f"{base_url}/api/health", timeout=60)
        yield base_url
    except TimeoutError:
        # Dump stderr so CI logs show why the server failed to start
        returncode = proc.returncode
        stderr_bytes = b""
        if proc.stderr:
            try:
                stderr_bytes = await asyncio.wait_for(proc.stderr.read(8192), timeout=2)
            except (asyncio.TimeoutError, Exception):
                pass
        stderr_text = stderr_bytes.decode("utf-8", errors="replace")
        proc.kill()
        pytest.fail(
            f"ironclaw server failed to start on port {gateway_port} "
            f"(returncode={returncode}).\nstderr:\n{stderr_text}"
        )
    finally:
        if proc.returncode is None:
            # Use SIGINT (not SIGTERM) so tokio's ctrl_c handler triggers a
            # graceful shutdown.  This lets the LLVM coverage runtime run its
            # atexit handler and flush .profraw files for cargo-llvm-cov.
            proc.send_signal(signal.SIGINT)
            try:
                await asyncio.wait_for(proc.wait(), timeout=10)
            except asyncio.TimeoutError:
                proc.kill()


@pytest.fixture(scope="session")
async def browser(ironclaw_server):
    """Session-scoped Playwright browser instance.

    Reuses a single browser process across all tests. Individual tests
    get isolated contexts via the ``page`` fixture.
    """
    from playwright.async_api import async_playwright

    headless = os.environ.get("HEADED", "").strip() not in ("1", "true")
    async with async_playwright() as p:
        b = await p.chromium.launch(headless=headless)
        yield b
        await b.close()


@pytest.fixture
async def page(ironclaw_server, browser):
    """Fresh Playwright browser context + page, navigated to the gateway with auth."""
    context = await browser.new_context(viewport={"width": 1280, "height": 720})
    pg = await context.new_page()
    await pg.goto(f"{ironclaw_server}/?token={AUTH_TOKEN}")
    # Wait for the app to initialize (auth screen hidden, SSE connected)
    await pg.wait_for_selector("#auth-screen", state="hidden", timeout=15000)
    yield pg
    await context.close()