#!/usr/bin/env python3
"""
DexOrder User Container Main Entry Point

Brings together:
- Config and secrets loading from k8s mounted YAML files
- ZeroMQ event publisher for user events
- MCP server with minimal "hello world" resource
- Lifecycle management integration
"""

import asyncio
import logging
import os
import signal
import sys
from pathlib import Path
from typing import Optional

import yaml
import uvicorn
from mcp.server import Server
from mcp.server.stdio import stdio_server
from mcp.server.sse import SseServerTransport
from starlette.applications import Starlette
from starlette.routing import Route, Mount
from starlette.requests import Request
from starlette.responses import Response
from sse_starlette import EventSourceResponse

from dexorder import EventPublisher, start_lifecycle_manager, get_lifecycle_manager
from dexorder.events import EventType, UserEvent, DeliverySpec
from dexorder.api.workspace_tools import get_workspace_store
from dexorder.api.category_tools import get_category_manager


# =============================================================================
# Global Data Directory
# =============================================================================

# Default data directory (relative to working directory for local dev)
DEFAULT_DATA_DIR = Path("data")

# Global data directory - set after config is loaded
DATA_DIR: Path = DEFAULT_DATA_DIR


def get_data_dir() -> Path:
    """Get the global data directory."""
    return DATA_DIR


# =============================================================================
# Configuration
# =============================================================================

class Config:
    """Application configuration loaded from config.yaml and secrets.yaml"""

    def __init__(self):
        # User ID (required)
        self.user_id: str = os.getenv("USER_ID", "")
        if not self.user_id:
            raise ValueError("USER_ID environment variable required")

        # Config and secrets paths (k8s mounted)
        self.config_path = Path(os.getenv("CONFIG_PATH", "/app/config/config.yaml"))
        self.secrets_path = Path(os.getenv("SECRETS_PATH", "/app/config/secrets.yaml"))

        # ZMQ ports for event system
        self.zmq_xpub_port: int = int(os.getenv("ZMQ_XPUB_PORT", "5570"))
        self.zmq_gateway_endpoint: str = os.getenv(
            "ZMQ_GATEWAY_ENDPOINT",
            "tcp://gateway:5571"
        )

        # MCP server settings
        self.mcp_server_name: str = os.getenv("MCP_SERVER_NAME", "dexorder-user")
        self.mcp_transport: str = os.getenv("MCP_TRANSPORT", "sse")  # "stdio" or "sse"
        self.mcp_http_port: int = int(os.getenv("MCP_HTTP_PORT", "3000"))
        self.mcp_http_host: str = os.getenv("MCP_HTTP_HOST", "0.0.0.0")

        # Lifecycle settings
        self.idle_timeout_minutes: int = int(os.getenv("IDLE_TIMEOUT_MINUTES", "15"))
        self.enable_idle_shutdown: bool = os.getenv("ENABLE_IDLE_SHUTDOWN", "true").lower() == "true"

        # Loaded from files
        self.config_data: dict = {}
        self.secrets_data: dict = {}

        # Data directory (set after config load)
        self.data_dir: Path = DEFAULT_DATA_DIR

    def load(self) -> None:
        """Load configuration and secrets from YAML files"""
        global DATA_DIR

        # Load config.yaml if exists
        if self.config_path.exists():
            with open(self.config_path) as f:
                self.config_data = yaml.safe_load(f) or {}
            logging.info(f"Loaded config from {self.config_path}")
        else:
            logging.warning(f"Config file not found: {self.config_path}")

        # Load secrets.yaml if exists
        if self.secrets_path.exists():
            with open(self.secrets_path) as f:
                self.secrets_data = yaml.safe_load(f) or {}
            logging.info(f"Loaded secrets from {self.secrets_path}")
        else:
            logging.warning(f"Secrets file not found: {self.secrets_path}")

        # Set data directory from config or environment
        # Priority: env var > config file > default
        data_dir_str = os.getenv("DATA_DIR") or self.config_data.get("data_dir")
        if data_dir_str:
            self.data_dir = Path(data_dir_str)
        else:
            self.data_dir = DEFAULT_DATA_DIR

        # Update global DATA_DIR
        DATA_DIR = self.data_dir

        # Ensure data directory exists
        self.data_dir.mkdir(parents=True, exist_ok=True)
        logging.info(f"Data directory: {self.data_dir}")

    @property
    def workspace_dir(self) -> Path:
        """Workspace directory under DATA_DIR."""
        return self.data_dir / "workspace"


# =============================================================================
# MCP Server Setup
# =============================================================================

def create_mcp_server(config: Config, event_publisher: EventPublisher) -> Server:
    """Create MCP server with resources and workspace tools"""

    server = Server(config.mcp_server_name)

    # Initialize workspace store
    workspace_store = get_workspace_store(config.workspace_dir)
    logging.info(f"Workspace store initialized at {config.workspace_dir}")

    # Initialize category file manager
    category_manager = get_category_manager(config.data_dir)
    logging.info(f"Category manager initialized at {config.data_dir}")

    @server.list_resources()
    async def list_resources():
        """List available resources"""
        return [
            {
                "uri": f"dexorder://user/{config.user_id}/hello",
                "name": "Hello World",
                "description": "A simple hello world resource",
                "mimeType": "text/plain",
                "annotations": {
                    "agent_accessible": True,  # Available to agent for ad-hoc queries
                }
            }
        ]

    @server.read_resource()
    async def read_resource(uri: str):
        """Read a resource by URI"""
        if uri == f"dexorder://user/{config.user_id}/hello":
            # Publish an event when resource is accessed
            await event_publisher.publish(UserEvent(
                event_type=EventType.STRATEGY_LOG,
                payload={
                    "message": "Hello world resource accessed",
                    "uri": uri,
                },
                delivery=DeliverySpec.informational(),
            ))

            return {
                "uri": uri,
                "mimeType": "text/plain",
                "text": f"Hello from DexOrder user container!\nUser ID: {config.user_id}\n",
            }
        else:
            raise ValueError(f"Unknown resource: {uri}")

    @server.list_tools()
    async def list_tools():
        """List available tools including workspace and category tools"""
        return [
            {
                "name": "workspace_read",
                "description": "Read a workspace store from persistent storage",
                "inputSchema": {
                    "type": "object",
                    "properties": {
                        "store_name": {
                            "type": "string",
                            "description": "Name of the store (e.g., 'chartStore', 'userPreferences')"
                        }
                    },
                    "required": ["store_name"]
                },
                "annotations": {
                    "agent_accessible": True,  # Agent can read workspace stores
                }
            },
            {
                "name": "workspace_write",
                "description": "Write a workspace store to persistent storage",
                "inputSchema": {
                    "type": "object",
                    "properties": {
                        "store_name": {
                            "type": "string",
                            "description": "Name of the store"
                        },
                        "data": {
                            "description": "Data to write"
                        }
                    },
                    "required": ["store_name", "data"]
                },
                "annotations": {
                    "agent_accessible": True,  # Agent can write workspace stores
                }
            },
            {
                "name": "workspace_patch",
                "description": "Apply JSON patch operations to a workspace store",
                "inputSchema": {
                    "type": "object",
                    "properties": {
                        "store_name": {
                            "type": "string",
                            "description": "Name of the store"
                        },
                        "patch": {
                            "type": "array",
                            "description": "JSON Patch operations (RFC 6902)",
                            "items": {
                                "type": "object",
                                "properties": {
                                    "op": {"type": "string", "enum": ["add", "remove", "replace", "move", "copy", "test"]},
                                    "path": {"type": "string"},
                                    "value": {}
                                },
                                "required": ["op", "path"]
                            }
                        }
                    },
                    "required": ["store_name", "patch"]
                },
                "annotations": {
                    "agent_accessible": True,  # Agent can patch workspace stores
                }
            },
            {
                "name": "category_write",
                "description": "Write a new strategy, indicator, or research script with validation",
                "inputSchema": {
                    "type": "object",
                    "properties": {
                        "category": {
                            "type": "string",
                            "enum": ["strategy", "indicator", "research"],
                            "description": "Category of the script"
                        },
                        "name": {
                            "type": "string",
                            "description": "Display name (can contain special characters)"
                        },
                        "description": {
                            "type": "string",
                            "description": "LLM-generated description of what this does (required)"
                        },
                        "code": {
                            "type": "string",
                            "description": "Python implementation code"
                        },
                        "metadata": {
                            "type": "object",
                            "description": "Optional category-specific metadata (e.g., default_length for indicators, data_feeds for strategies)"
                        }
                    },
                    "required": ["category", "name", "description", "code"]
                },
                "annotations": {
                    "agent_accessible": True,
                }
            },
            {
                "name": "category_edit",
                "description": "Edit an existing category script (updates code, description, or metadata)",
                "inputSchema": {
                    "type": "object",
                    "properties": {
                        "category": {
                            "type": "string",
                            "enum": ["strategy", "indicator", "research"],
                            "description": "Category of the script"
                        },
                        "name": {
                            "type": "string",
                            "description": "Display name of the existing item"
                        },
                        "code": {
                            "type": "string",
                            "description": "Updated Python code (optional, omit to keep existing)"
                        },
                        "description": {
                            "type": "string",
                            "description": "Updated description (optional, omit to keep existing)"
                        },
                        "metadata": {
                            "type": "object",
                            "description": "Updated metadata fields (optional)"
                        }
                    },
                    "required": ["category", "name"]
                },
                "annotations": {
                    "agent_accessible": True,
                }
            },
            {
                "name": "category_read",
                "description": "Read a category script and its metadata",
                "inputSchema": {
                    "type": "object",
                    "properties": {
                        "category": {
                            "type": "string",
                            "enum": ["strategy", "indicator", "research"],
                            "description": "Category of the script"
                        },
                        "name": {
                            "type": "string",
                            "description": "Display name of the item"
                        }
                    },
                    "required": ["category", "name"]
                },
                "annotations": {
                    "agent_accessible": True,
                }
            },
            {
                "name": "category_list",
                "description": "List all items in a category with names and descriptions",
                "inputSchema": {
                    "type": "object",
                    "properties": {
                        "category": {
                            "type": "string",
                            "enum": ["strategy", "indicator", "research"],
                            "description": "Category to list"
                        }
                    },
                    "required": ["category"]
                },
                "annotations": {
                    "agent_accessible": True,
                }
            }
        ]

    @server.call_tool()
    async def handle_tool_call(name: str, arguments: dict):
        """Handle tool calls including workspace and category tools"""
        if name == "workspace_read":
            return workspace_store.read(arguments.get("store_name", ""))
        elif name == "workspace_write":
            return workspace_store.write(
                arguments.get("store_name", ""),
                arguments.get("data")
            )
        elif name == "workspace_patch":
            return workspace_store.patch(
                arguments.get("store_name", ""),
                arguments.get("patch", [])
            )
        elif name == "category_write":
            return category_manager.write(
                category=arguments.get("category", ""),
                name=arguments.get("name", ""),
                description=arguments.get("description", ""),
                code=arguments.get("code", ""),
                metadata=arguments.get("metadata")
            )
        elif name == "category_edit":
            return category_manager.edit(
                category=arguments.get("category", ""),
                name=arguments.get("name", ""),
                code=arguments.get("code"),
                description=arguments.get("description"),
                metadata=arguments.get("metadata")
            )
        elif name == "category_read":
            return category_manager.read(
                category=arguments.get("category", ""),
                name=arguments.get("name", "")
            )
        elif name == "category_list":
            return category_manager.list_items(
                category=arguments.get("category", "")
            )
        else:
            raise ValueError(f"Unknown tool: {name}")

    logging.info(f"MCP server '{config.mcp_server_name}' created with workspace and category tools")
    return server


# =============================================================================
# SSE Transport Setup
# =============================================================================

def create_sse_app(mcp_server: Server) -> Starlette:
    """Create Starlette app with SSE endpoint for MCP"""

    # Create SSE transport instance
    sse = SseServerTransport("/messages/")

    async def handle_sse(request: Request) -> Response:
        """Handle SSE connections for MCP"""
        async with sse.connect_sse(
            request.scope, request.receive, request._send
        ) as streams:
            await mcp_server.run(
                streams[0],
                streams[1],
                mcp_server.create_initialization_options()
            )
        return Response()

    async def handle_health(request: Request) -> Response:
        """Health check endpoint for k8s probes and gateway readiness checks"""
        return Response(
            content='{"status":"ok"}',
            media_type="application/json"
        )

    app = Starlette(
        routes=[
            Route("/sse", handle_sse),
            Mount("/messages/", app=sse.handle_post_message),
            Route("/health", handle_health),
        ]
    )

    return app


# =============================================================================
# Main Application
# =============================================================================

class UserContainer:
    """Main user container application"""

    def __init__(self):
        self.config = Config()
        self.event_publisher: Optional[EventPublisher] = None
        self.mcp_server: Optional[Server] = None
        self.running = False

    async def start(self) -> None:
        """Start all subsystems"""
        logging.info("Starting user container")

        # Load configuration
        self.config.load()

        # Start lifecycle manager
        await start_lifecycle_manager(
            user_id=self.config.user_id,
            idle_timeout_minutes=self.config.idle_timeout_minutes,
            enable_idle_shutdown=self.config.enable_idle_shutdown,
        )
        logging.info("Lifecycle manager started")

        # Start event publisher
        self.event_publisher = EventPublisher(
            user_id=self.config.user_id,
            xpub_port=self.config.zmq_xpub_port,
            gateway_router_endpoint=self.config.zmq_gateway_endpoint,
        )
        await self.event_publisher.start()
        logging.info("Event publisher started")

        # Publish CONTAINER_STARTING event
        await self.event_publisher.publish(UserEvent(
            event_type=EventType.CONTAINER_STARTING,
            payload={
                "user_id": self.config.user_id,
                "timestamp": None,  # Will be auto-filled
            },
            delivery=DeliverySpec.active_or_telegram(),
        ))

        # Create MCP server
        self.mcp_server = create_mcp_server(self.config, self.event_publisher)

        # Publish CONTAINER_READY event
        await self.event_publisher.publish(UserEvent(
            event_type=EventType.CONTAINER_READY,
            payload={
                "user_id": self.config.user_id,
            },
            delivery=DeliverySpec.active_or_telegram(),
        ))

        self.running = True
        logging.info("User container ready")

    async def stop(self) -> None:
        """Stop all subsystems"""
        if not self.running:
            return

        logging.info("Stopping user container")
        self.running = False

        # Publish CONTAINER_SHUTTING_DOWN event
        if self.event_publisher:
            await self.event_publisher.publish(UserEvent(
                event_type=EventType.CONTAINER_SHUTTING_DOWN,
                payload={
                    "user_id": self.config.user_id,
                },
                delivery=DeliverySpec.active_or_telegram(),
            ))

        # Stop subsystems
        if self.event_publisher:
            await self.event_publisher.stop()
            logging.info("Event publisher stopped")

        lifecycle = get_lifecycle_manager()
        if lifecycle:
            await lifecycle.stop()
            logging.info("Lifecycle manager stopped")

        logging.info("User container stopped")

    async def run(self) -> None:
        """Run the MCP server with configured transport"""
        await self.start()

        try:
            if self.config.mcp_transport == "stdio":
                # Run MCP server on stdio (for dev/testing)
                logging.info("Starting MCP server with stdio transport")
                async with stdio_server() as (read_stream, write_stream):
                    await self.mcp_server.run(
                        read_stream,
                        write_stream,
                        self.mcp_server.create_initialization_options()
                    )
            elif self.config.mcp_transport == "sse":
                # Run MCP server via HTTP/SSE (for production)
                logging.info(f"Starting MCP server with SSE transport on {self.config.mcp_http_host}:{self.config.mcp_http_port}")
                app = create_sse_app(self.mcp_server)
                config = uvicorn.Config(
                    app,
                    host=self.config.mcp_http_host,
                    port=self.config.mcp_http_port,
                    log_level=os.getenv("LOG_LEVEL", "info").lower(),
                    access_log=True,
                )
                server = uvicorn.Server(config)
                await server.serve()
            else:
                raise ValueError(f"Unknown MCP transport: {self.config.mcp_transport}")
        finally:
            await self.stop()


# =============================================================================
# Entry Point
# =============================================================================

async def main():
    """Main entry point"""
    # Setup logging
    log_level = os.getenv("LOG_LEVEL", "INFO").upper()
    logging.basicConfig(
        level=getattr(logging, log_level),
        format="%(asctime)s [%(levelname)s] %(name)s: %(message)s",
        stream=sys.stderr,  # MCP uses stdout for protocol
    )

    # Create and run container
    container = UserContainer()

    # Handle shutdown signals
    loop = asyncio.get_event_loop()

    def handle_signal(sig):
        logging.info(f"Received signal {sig}, shutting down...")
        asyncio.create_task(container.stop())
        loop.stop()

    for sig in (signal.SIGTERM, signal.SIGINT):
        loop.add_signal_handler(sig, lambda s=sig: handle_signal(s))

    try:
        await container.run()
    except KeyboardInterrupt:
        logging.info("Keyboard interrupt received")
    except Exception as e:
        logging.error(f"Fatal error: {e}", exc_info=True)
        sys.exit(1)


if __name__ == "__main__":
    asyncio.run(main())