"""
Test context for E2E tests.

Provides isolated directories and a replaying proxy for testing the SDK.
"""

import os
import re
import shutil
import tempfile
from pathlib import Path
from typing import Optional

from copilot import CopilotClient

from .proxy import CapiProxy


def get_cli_path() -> str:
    """Get CLI path from environment or try to find it. Raises if not found."""
    # Check environment variable first
    cli_path = os.environ.get("COPILOT_CLI_PATH")
    if cli_path and os.path.exists(cli_path):
        return cli_path

    # Look for CLI in sibling nodejs directory's node_modules
    base_path = Path(__file__).parent.parent.parent.parent
    full_path = base_path / "nodejs" / "node_modules" / "@github" / "copilot" / "index.js"
    if full_path.exists():
        return str(full_path.resolve())

    raise RuntimeError(
        "CLI not found. Set COPILOT_CLI_PATH or run 'npm install' in the nodejs directory."
    )


CLI_PATH = get_cli_path()
SNAPSHOTS_DIR = Path(__file__).parent.parent.parent.parent / "test" / "snapshots"


class E2ETestContext:
    """Holds shared resources for E2E tests."""

    def __init__(self):
        self.cli_path: str = ""
        self.home_dir: str = ""
        self.work_dir: str = ""
        self.proxy_url: str = ""
        self._proxy: Optional[CapiProxy] = None
        self._client: Optional[CopilotClient] = None

    async def setup(self):
        """Set up the test context with a shared client."""
        cli_path = get_cli_path()
        if not cli_path or not os.path.exists(cli_path):
            raise RuntimeError(
                f"CLI not found at {cli_path}. Run 'npm install' in the nodejs directory first."
            )
        self.cli_path = cli_path

        self.home_dir = tempfile.mkdtemp(prefix="copilot-test-config-")
        self.work_dir = tempfile.mkdtemp(prefix="copilot-test-work-")

        self._proxy = CapiProxy()
        self.proxy_url = await self._proxy.start()

        # Create the shared client (like Node.js/Go do)
        self._client = CopilotClient(
            {
                "cli_path": self.cli_path,
                "cwd": self.work_dir,
                "env": self.get_env(),
            }
        )

    async def teardown(self):
        """Clean up the test context."""
        if self._client:
            await self._client.stop()
            self._client = None

        if self._proxy:
            await self._proxy.stop()
            self._proxy = None

        if self.home_dir and os.path.exists(self.home_dir):
            shutil.rmtree(self.home_dir, ignore_errors=True)

        if self.work_dir and os.path.exists(self.work_dir):
            shutil.rmtree(self.work_dir, ignore_errors=True)

    async def configure_for_test(self, test_file: str, test_name: str):
        """
        Configure the proxy for a specific test.

        Args:
            test_file: The test file name (e.g., "session" from "test_session.py")
            test_name: The test name (e.g., "should_have_stateful_conversation")
        """
        sanitized_name = re.sub(r"[^a-zA-Z0-9]", "_", test_name).lower()
        snapshot_path = SNAPSHOTS_DIR / test_file / f"{sanitized_name}.yaml"
        abs_snapshot_path = str(snapshot_path.resolve())

        if self._proxy:
            await self._proxy.configure(abs_snapshot_path, self.work_dir)

        # Clear temp directories between tests (but leave them in place)
        for item in Path(self.home_dir).iterdir():
            if item.is_dir():
                shutil.rmtree(item)
            else:
                item.unlink()
        for item in Path(self.work_dir).iterdir():
            if item.is_dir():
                shutil.rmtree(item)
            else:
                item.unlink()

    def get_env(self) -> dict:
        """Return environment variables configured for isolated testing."""
        env = os.environ.copy()

        env.update(
            {
                "COPILOT_API_URL": self.proxy_url,
                "XDG_CONFIG_HOME": self.home_dir,
                "XDG_STATE_HOME": self.home_dir,
            }
        )
        return env

    @property
    def client(self) -> CopilotClient:
        """Return the shared CopilotClient instance."""
        if not self._client:
            raise RuntimeError("Context not set up. Call setup() first.")
        return self._client

    async def get_exchanges(self):
        """Retrieve the captured HTTP exchanges from the proxy."""
        if not self._proxy:
            raise RuntimeError("Proxy not started")
        return await self._proxy.get_exchanges()