"""App Factory - Autonomous multi-agent orchestration framework.

Usage:
    python main.py --prompt "Build a video transcription service" --repo-path /path/to/project
    python main.py --prompt "Build a REST API" --max-concurrent-tasks 3 --debug
    python main.py --dry-run --prompt "Test project"
"""

import argparse
import asyncio
import logging
import os
import shutil
import signal
import subprocess
import sys
from datetime import datetime, timezone

from dotenv import load_dotenv

from app_factory.core.logging_utils import LevelColorFormatter


# ---------------------------------------------------------------------------
# Custom exceptions
# ---------------------------------------------------------------------------


class AppFactoryError(Exception):
    """Base exception for App Factory."""


class ClarificationTimeout(AppFactoryError):
    """A task needs human input but timed out waiting."""


class DockerDaemonError(AppFactoryError):
    """Docker daemon is not reachable."""


class GitError(AppFactoryError):
    """Git operation failed."""


class MCPConnectionError(AppFactoryError):
    """MCP server connection failed."""


class ConfigurationError(AppFactoryError):
    """Missing or invalid configuration."""


logger = logging.getLogger("app_factory")


# ---------------------------------------------------------------------------
# CLI
# ---------------------------------------------------------------------------


def parse_args(argv=None):
    """Parse CLI arguments."""
    parser = argparse.ArgumentParser(
        description="App Factory - Autonomous multi-agent orchestration framework.",
    )
    parser.add_argument(
        "--prompt",
        required=True,
        help="Project description for the App Factory to build.",
    )
    parser.add_argument(
        "--repo-path",
        default=os.getcwd(),
        help="Target repository path (default: current directory).",
    )
    parser.add_argument(
        "--max-concurrent-tasks",
        type=int,
        default=5,
        help="Maximum parallel dev agents (default: 5).",
    )
    parser.add_argument(
        "--debug",
        action="store_true",
        help="Enable verbose debug logging.",
    )
    parser.add_argument(
        "--dry-run",
        action="store_true",
        help="Validate configuration without executing.",
    )
    return parser.parse_args(argv)


def validate_environment():
    """Check required env vars, Docker daemon, and git availability.

    Returns:
        dict of validated config values.

    Raises:
        DockerDaemonError: If Docker is unreachable.
        GitError: If git is not available.
    """
    # API key (optional — Claude Code OAuth is also supported)
    api_key = "".join(os.environ.get("ANTHROPIC_API_KEY", "").split())
    auth_token = "".join(os.environ.get("ANTHROPIC_AUTH_TOKEN", "").split())

    if api_key:
        os.environ["ANTHROPIC_API_KEY"] = api_key
    if auth_token:
        os.environ["ANTHROPIC_AUTH_TOKEN"] = auth_token

    if not api_key and not auth_token:
        logger.warning(
            "No ANTHROPIC_API_KEY or ANTHROPIC_AUTH_TOKEN set; relying on Claude Code OAuth session."
        )

    # Docker
    try:
        result = subprocess.run(
            ["docker", "info"],
            capture_output=True,
            text=True,
            timeout=10,
        )
        if result.returncode != 0:
            raise DockerDaemonError(
                "Docker daemon not running. Start Docker Desktop and retry."
            )
    except FileNotFoundError:
        raise DockerDaemonError(
            "Docker not found on PATH. Install Docker and retry."
        )
    except subprocess.TimeoutExpired:
        raise DockerDaemonError(
            "Docker daemon not responding. Start Docker Desktop and retry."
        )

    # Git
    if not shutil.which("git"):
        raise GitError("git not found on PATH. Install git and retry.")

    return {
        "api_key": api_key,
        "auth_token": auth_token,
        "langsmith_api_key": os.environ.get("LANGSMITH_API_KEY", ""),
        "langsmith_project": os.environ.get("LANGSMITH_PROJECT", "app-factory"),
    }


# ---------------------------------------------------------------------------
# Orchestrator execution
# ---------------------------------------------------------------------------


async def run_factory(args, config: dict) -> dict:
    """Main execution flow: initialize all components and run the orchestrator.

    Returns:
        Final state dict from the orchestrator.
    """
    from app_factory.agents.dev_agent import DevAgentManager
    from app_factory.agents.pm_agent import PMAgent
    from app_factory.agents.qa_agent import QAAgent
    from app_factory.agents.task_agent import TaskMasterAgent
    from app_factory.core.architecture_tracker import ArchitectureTracker
    from app_factory.core.graph import AppFactoryOrchestrator
    from app_factory.core.observability import ObservabilityManager
    from app_factory.core.workspace import WorkspaceManager

    api_key = config.get("api_key") or None
    auth_token = config.get("auth_token") or None
    raw_debug_flag = getattr(args, "debug", False)
    debug_enabled = raw_debug_flag if isinstance(raw_debug_flag, bool) else False

    # 1. Observability
    observability = ObservabilityManager(
        project_name=config.get("langsmith_project", "app-factory"),
    )

    # 2. Workspace
    workspace_manager = WorkspaceManager(repo_path=args.repo_path)

    # 3. Architecture tracker
    arch_tracker = ArchitectureTracker(
        api_key=api_key,
        auth_token=auth_token,
        debug=debug_enabled,
        observability=observability,
    )

    # 4. Agents
    pm_agent = PMAgent(
        api_key=api_key,
        auth_token=auth_token,
        debug=debug_enabled,
        observability=observability,
    )
    task_agent = TaskMasterAgent(project_root=args.repo_path)
    dev_manager = DevAgentManager(
        docker_client=workspace_manager.docker_client,
        max_retries=3,
    )
    qa_agent = QAAgent(
        repo_path=args.repo_path,
        api_key=api_key,
        auth_token=auth_token,
        debug=debug_enabled,
        observability=observability,
    )

    # 5. Orchestrator
    orchestrator = AppFactoryOrchestrator(
        pm_agent=pm_agent,
        task_agent=task_agent,
        dev_manager=dev_manager,
        qa_agent=qa_agent,
        workspace_manager=workspace_manager,
        observability=observability,
    )

    # 6. Set up graceful shutdown
    GracefulShutdown(workspace_manager=workspace_manager)

    # 7. Execute
    result = await orchestrator.run(args.prompt)

    return result


# ---------------------------------------------------------------------------
# Summary
# ---------------------------------------------------------------------------


def print_summary(result: dict, start_time: datetime):
    """Print final execution summary."""
    elapsed = datetime.now(timezone.utc) - start_time
    minutes, seconds = divmod(int(elapsed.total_seconds()), 60)

    completed = result.get("completed_tasks", [])
    tasks = result.get("tasks", [])
    errors = result.get("errors", [])

    print("\n" + "=" * 60)
    print("APP FACTORY - Execution Summary")
    print("=" * 60)
    print(f"  Tasks completed : {len(completed)} / {len(tasks)}")
    print(f"  Execution time  : {minutes}m {seconds}s")
    print(f"  Iterations      : {result.get('iteration_count', 0)}")

    if errors:
        print(f"  Errors          : {len(errors)}")
        for err in errors[:5]:
            print(f"    - {err[:120]}")
        if len(errors) > 5:
            print(f"    ... and {len(errors) - 5} more")

    langsmith_project = os.environ.get("LANGSMITH_PROJECT", "")
    if langsmith_project:
        print(f"  LangSmith       : project={langsmith_project}")

    print("=" * 60)


# ---------------------------------------------------------------------------
# Graceful shutdown
# ---------------------------------------------------------------------------


class GracefulShutdown:
    """Signal handler for SIGINT/SIGTERM with two-stage shutdown."""

    def __init__(self, workspace_manager=None):
        self.shutdown_requested = False
        self.workspace_manager = workspace_manager
        signal.signal(signal.SIGINT, self._handler)
        signal.signal(signal.SIGTERM, self._handler)

    def _handler(self, signum, frame):
        if self.shutdown_requested:
            print("\nForce exit.")
            sys.exit(1)
        self.shutdown_requested = True
        print("\nShutting down gracefully... (press Ctrl+C again to force)")
        if self.workspace_manager:
            try:
                loop = asyncio.get_running_loop()
                loop.create_task(self.workspace_manager.cleanup_all())
            except RuntimeError:
                # No running loop - run synchronously is not possible for async cleanup
                pass


# ---------------------------------------------------------------------------
# Entry point
# ---------------------------------------------------------------------------


def main():
    """Entry point: load env, parse args, validate, run factory."""
    load_dotenv()
    args = parse_args()

    # Logging
    level = logging.DEBUG if args.debug else logging.INFO
    stream_handler = logging.StreamHandler()
    stream_handler.setFormatter(
        LevelColorFormatter(
            fmt="[%(asctime)s] [%(name)s] [%(levelname)s] %(message)s",
            datefmt="%Y-%m-%dT%H:%M:%S",
            stream=stream_handler.stream,
        )
    )
    logging.basicConfig(
        level=level,
        handlers=[stream_handler],
        force=True,
    )

    # Validate or dry-run
    try:
        config = validate_environment()
    except ConfigurationError as e:
        print(f"Configuration error: {e}", file=sys.stderr)
        sys.exit(1)
    except DockerDaemonError as e:
        print(f"Docker error: {e}", file=sys.stderr)
        sys.exit(1)
    except GitError as e:
        print(f"Git error: {e}", file=sys.stderr)
        sys.exit(1)

    if args.dry_run:
        print("Dry-run: configuration is valid. All checks passed.")
        return

    # Run
    start_time = datetime.now(timezone.utc)
    try:
        result = asyncio.run(run_factory(args, config))
        print_summary(result, start_time)
    except ClarificationTimeout as e:
        print(
            f"Clarification timeout: {e}. "
            "Run with --interactive for manual resolution.",
            file=sys.stderr,
        )
        sys.exit(1)
    except KeyboardInterrupt:
        print("\nInterrupted.", file=sys.stderr)
        sys.exit(130)
    except Exception as e:
        logger.exception("Fatal error")
        print(f"Fatal error: {e}", file=sys.stderr)
        sys.exit(1)


if __name__ == "__main__":
    main()