import os
import json
from fastapi import FastAPI, HTTPException, WebSocket, WebSocketDisconnect
from fastapi.middleware.cors import CORSMiddleware

from .config import CORS_ALLOW_ORIGINS
from .db import init_db, get_all_agents, get_agent_config, update_agent_config, get_agent_tasks, get_pending_approvals, get_task, get_logs, get_activity_feed
from .models import CommandRequest, ApprovalRequest, AgentConfigUpdate
from .websocket_manager import ws_manager
from .agents import init_agents, get_agent, get_all_agent_states, AGENT_REGISTRY
from .scheduler import init_scheduler
from . import telegram_bot

app = FastAPI()

_cors_origins = CORS_ALLOW_ORIGINS.split(",")
app.add_middleware(
    CORSMiddleware,
    allow_origins=[o.strip() for o in _cors_origins],
    allow_credentials=False,
    allow_methods=["GET", "POST", "PUT", "DELETE", "OPTIONS"],
    allow_headers=["Content-Type"],
)

@app.on_event("startup")
async def on_startup():
    init_db()
    os.makedirs("/app/data", exist_ok=True)
    init_agents()
    for agent in AGENT_REGISTRY.values():
        agent.set_ws_manager(ws_manager)
    init_scheduler()

@app.get("/health")
def health():
    return {"ok": True}

# --- WebSocket ---

@app.websocket("/api/agent-office/ws")
async def websocket_endpoint(ws: WebSocket):
    await ws_manager.connect(ws)
    try:
        await ws.send_text(json.dumps({
            "type": "init",
            "agents": get_all_agent_states(),
            "pending": [t["id"] for t in get_pending_approvals()],
        }, ensure_ascii=False))
        while True:
            data = await ws.receive_text()
            try:
                msg = json.loads(data)
            except json.JSONDecodeError:
                continue
            await _handle_ws_message(msg)
    except WebSocketDisconnect:
        pass
    finally:
        await ws_manager.disconnect(ws)

async def _handle_ws_message(msg: dict):
    msg_type = msg.get("type")
    agent_id = msg.get("agent")
    agent = get_agent(agent_id) if agent_id else None

    if msg_type == "command" and agent:
        action = msg.get("action", "")
        params = msg.get("params", {})
        result = await agent.on_command(action, params)
        await ws_manager.broadcast({"type": "command_result", "agent": agent_id, "result": result})

    elif msg_type == "approval" and agent:
        task_id = msg.get("task_id")
        approved = msg.get("approved", False)
        if task_id:
            await agent.on_approval(task_id, approved)

    elif msg_type == "query" and agent:
        status = await agent.get_status()
        await ws_manager.broadcast({"type": "agent_status", "agent": agent_id, "status": status})

# --- REST Endpoints ---

@app.get("/api/agent-office/agents")
def list_agents():
    return {"agents": get_all_agents()}

@app.get("/api/agent-office/agents/{agent_id}")
def agent_detail(agent_id: str):
    config = get_agent_config(agent_id)
    if not config:
        raise HTTPException(status_code=404, detail="Agent not found")
    agent = get_agent(agent_id)
    state_info = {"state": agent.state, "detail": agent.state_detail} if agent else {}
    return {**config, **state_info}

@app.put("/api/agent-office/agents/{agent_id}")
def update_agent(agent_id: str, body: AgentConfigUpdate):
    update_agent_config(agent_id, enabled=body.enabled,
                        schedule_config=body.schedule_config,
                        custom_config=body.custom_config)
    return {"ok": True}

@app.get("/api/agent-office/agents/{agent_id}/tasks")
def agent_tasks(agent_id: str, limit: int = 20):
    return {"tasks": get_agent_tasks(agent_id, limit)}

@app.get("/api/agent-office/agents/{agent_id}/logs")
def agent_logs(agent_id: str, limit: int = 50):
    return {"logs": get_logs(agent_id, limit)}

@app.get("/api/agent-office/tasks/pending")
def pending_tasks():
    return {"tasks": get_pending_approvals()}

@app.get("/api/agent-office/tasks/{task_id}")
def task_detail(task_id: str):
    task = get_task(task_id)
    if not task:
        raise HTTPException(status_code=404, detail="Task not found")
    return task

@app.post("/api/agent-office/command")
async def send_command(body: CommandRequest):
    agent = get_agent(body.agent)
    if not agent:
        return {"error": f"Agent '{body.agent}' not found"}
    result = await agent.on_command(body.action, body.params or {})
    return result

@app.post("/api/agent-office/approve")
async def approve(body: ApprovalRequest):
    agent = get_agent(body.agent)
    if not agent:
        return {"error": f"Agent '{body.agent}' not found"}
    await agent.on_approval(body.task_id, body.approved, body.feedback or "")
    return {"ok": True}

# --- Telegram Webhook ---

async def _agent_dispatcher(agent_id: str, command: str, params: dict) -> dict:
    """텔레그램 라우터가 호출하는 에이전트 디스패처."""
    # 전역 상태 조회
    if agent_id == "__global__" and command == "status":
        result = {}
        for aid, agent in AGENT_REGISTRY.items():
            result[aid] = {"state": agent.state, "detail": agent.state_detail}
        return result

    agent = AGENT_REGISTRY.get(agent_id)
    if agent is None:
        return {"ok": False, "message": f"Unknown agent: {agent_id}"}
    return await agent.on_command(command, params or {})


@app.post("/api/agent-office/telegram/webhook")
async def telegram_webhook(data: dict):
    result = await telegram_bot.handle_webhook(data, agent_dispatcher=_agent_dispatcher)
    # callback_query (승인/거절) → 기존 승인 흐름
    if result and "approved" in result:
        agent = get_agent(result["agent_id"])
        if agent:
            await agent.on_approval(result["task_id"], result["approved"])
    return {"ok": True}

@app.get("/api/agent-office/states")
def all_states():
    return {"agents": get_all_agent_states()}

@app.get("/api/agent-office/agents/{agent_id}/token-usage")
def agent_token_usage(agent_id: str, days: int = 1):
    from .db import get_token_usage_stats
    return get_token_usage_stats(agent_id, days)

@app.get("/api/agent-office/conversation/stats")
def conversation_stats(days: int = 7):
    from .db import get_conversation_stats
    return get_conversation_stats(days)

@app.get("/api/agent-office/activity")
def activity_feed(limit: int = 50, offset: int = 0):
    return get_activity_feed(limit, offset)