"""Main entry point for X-Agents agent service."""

import logging
import asyncio
import sys
from pathlib import Path

# Add project root to path (parent of core directory)
project_root = Path(__file__).parent.parent.parent
core_dir = project_root / "core"
sys.path.insert(0, str(project_root))  # for X-Agents root
sys.path.insert(0, str(core_dir))      # for core
sys.path.insert(0, str(core_dir / "nanobot"))  # for nanobot

from fastapi import FastAPI
import uvicorn

from agents.config import Config
from agents.api.routes import router, set_agent, set_team_agent, add_cors
from agents.agent.loop import AgentLoop
from agents.agent.team_agent import TeamAgent
from agents.llm import ProviderFactory
from agents.tools import create_default_registry

# Configure logging
logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s - %(name)s - %(levelname)s - %(message)s",
)
logger = logging.getLogger(__name__)


class SimpleProvider:
    """Simple LLM provider placeholder for testing without API keys."""

    def __init__(self, api_key: str = "", base_url: str | None = None):
        self.api_key = api_key
        self.base_url = base_url

    async def chat(self, messages: list[dict], model: str, **kwargs) -> dict:
        """Simulate LLM chat response.

        Args:
            messages: Message list
            model: Model name

        Returns:
            Simulated response
        """
        from agents.llm import LLMResponse

        user_msg = ""
        for msg in reversed(messages):
            if msg.get("role") == "user":
                user_msg = msg.get("content", "")
                break

        return LLMResponse(
            content=f"I received your message: {user_msg[:50]}... (LLM integration pending)",
            tool_calls=[],
            finish_reason="stop",
        )

    async def chat_with_retry(self, *args, **kwargs):
        return await self.chat(*args, **kwargs)

    def get_default_model(self) -> str:
        return "simple"


def create_app(config: Config | None = None) -> FastAPI:
    """Create and configure the FastAPI application.

    Args:
        config: Configuration instance

    Returns:
        Configured FastAPI app
    """
    config = config or Config()

    app = FastAPI(
        title="X-Agents API",
        description="Agent API for X-Agents platform",
        version="0.1.0",
    )

    # Include routers with /api/v1 prefix (aligned with Go backend paths: /api/agent/chat, /api/agent/chat/stream)
    app.include_router(router, prefix="/api/v1")

    # Add CORS middleware to allow Go backend cross-origin requests
    add_cors(app)

    # Initialize LLM provider
    if config.LLM_API_KEY:
        try:
            provider = ProviderFactory.create(
                provider=config.LLM_PROVIDER,
                api_key=config.LLM_API_KEY,
                api_base=config.LLM_BASE_URL,
            )
            logger.info(f"Using {config.LLM_PROVIDER} provider with model {config.LLM_MODEL}")
        except ImportError as e:
            logger.warning(f"Failed to import provider package: {e}, using placeholder")
            provider = SimpleProvider(api_key=config.LLM_API_KEY)
    else:
        logger.warning("No LLM_API_KEY provided, using placeholder provider")
        provider = SimpleProvider()

    # Create tool registry
    tools = create_default_registry()

    # Initialize agent
    agent = AgentLoop(
        provider=provider,
        model=config.LLM_MODEL,
        workspace=config.WORKSPACE,
        max_iterations=config.MAX_ITERATIONS,
        tools=tools,
    )

    set_agent(agent)

    # Initialize team agent for multi-agent collaboration
    team_agent = TeamAgent(
        provider=provider,
        model=config.LLM_MODEL,
        workspace=config.WORKSPACE,
    )
    set_team_agent(team_agent)

    @app.on_event("startup")
    async def startup_event():
        logger.info("X-Agents starting up...")
        logger.info(f"Model: {config.LLM_MODEL}")
        logger.info(f"Provider: {config.LLM_PROVIDER}")
        logger.info(f"Workspace: {config.WORKSPACE}")
        logger.info(f"Tools: {tools.tool_names}")

    @app.on_event("shutdown")
    async def shutdown_event():
        logger.info("X-Agents shutting down...")

    return app


def main():
    """Run the agent service."""
    config = Config()

    # Ensure workspace exists
    config.WORKSPACE.mkdir(exist_ok=True)

    app = create_app(config)

    uvicorn.run(
        app,
        host=config.API_HOST,
        port=config.API_PORT,
        log_level="info",
    )


if __name__ == "__main__":
    main()