"""定时任务 API 路由 - 创建/启动/停止/删除/列表"""

import logging
from datetime import datetime

from fastapi import APIRouter, Depends, HTTPException
from sqlalchemy import select
from sqlalchemy.ext.asyncio import AsyncSession

from app.database import get_db
from app.models.market import ScheduledTask
from app.schemas import CreateTaskRequest, TaskInfo, TaskListResponse
from app.services.cache import (
    create_task,
    delete_task,
    disable_task,
    enable_task,
    get_task,
)
from app.services.scheduler import (
    add_job,
    get_all_jobs,
    is_job_running,
    remove_job,
)

logger = logging.getLogger(__name__)
router = APIRouter(prefix="/tasks", tags=["定时任务"])


def _to_task_info(task: ScheduledTask, job_info: dict | None = None) -> TaskInfo:
    """ORM -> Pydantic TaskInfo。"""
    next_run = None
    if job_info and job_info.get("next_run_time"):
        next_run = job_info["next_run_time"]

    return TaskInfo(
        id=task.id,
        symbol=task.symbol,
        data_type=task.data_type,
        periods=task.periods.split(",") if task.periods else [],
        interval_seconds=task.interval_seconds,
        task_type=task.task_type if hasattr(task, "task_type") else "interval",
        enabled=task.enabled,
        running=False,  # 由调用方异步更新
        last_run=task.last_run.isoformat() if task.last_run else None,
        last_status=task.last_status,
        next_run=next_run,
        created_at=task.created_at.isoformat(),
        updated_at=task.updated_at.isoformat(),
    )


@router.post("", response_model=TaskInfo)
async def create_new_task(
    req: CreateTaskRequest,
    db: AsyncSession = Depends(get_db),
):
    """创建并启动一个定时采集任务。"""
    periods_str = ",".join(req.periods) if isinstance(req.periods, list) else req.periods

    task = await create_task(
        db=db,
        symbol=req.symbol,
        data_type=req.data_type,
        periods=periods_str,
        interval_seconds=req.interval_seconds,
        task_type=req.task_type,
        run_time=req.run_time,
    )

    job_id = await add_job(task.id, task.interval_seconds, task.task_type, task.run_time)
    task.job_id = job_id
    await db.flush()

    return _to_task_info(task)


@router.get("", response_model=TaskListResponse)
async def list_all_tasks(
    db: AsyncSession = Depends(get_db),
):
    """列出所有定时任务（未完成的）。"""
    stmt = (
        select(ScheduledTask)
        .where(ScheduledTask.is_finished == False)  # noqa: E712
        .order_by(ScheduledTask.created_at.desc())
    )
    result = await db.execute(stmt)
    tasks = list(result.scalars().all())
    job_status = await get_all_jobs()

    task_infos = []
    for t in tasks:
        job_id = f"task_{t.id}"
        job_info = job_status.get(job_id)
        info = _to_task_info(t, job_info)
        info.running = await is_job_running(t.id)
        task_infos.append(info)

    return TaskListResponse(tasks=task_infos, total=len(task_infos))


@router.get("/history", response_model=TaskListResponse)
async def list_finished_tasks(
    db: AsyncSession = Depends(get_db),
):
    """列出已完成的历史任务。"""
    stmt = (
        select(ScheduledTask)
        .where(ScheduledTask.is_finished == True)  # noqa: E712
        .order_by(ScheduledTask.updated_at.desc())
    )
    result = await db.execute(stmt)
    tasks = list(result.scalars().all())

    task_infos = [_to_task_info(t) for t in tasks]
    return TaskListResponse(tasks=task_infos, total=len(task_infos))


@router.post("/{task_id}/rerun", response_model=TaskInfo)
async def rerun_task(
    task_id: int,
    db: AsyncSession = Depends(get_db),
):
    """重新执行已完成的任务。"""
    task = await get_task(db, task_id)
    if not task:
        raise HTTPException(status_code=404, detail=f"任务 {task_id} 不存在")

    if not task.is_finished:
        raise HTTPException(status_code=400, detail=f"任务 {task_id} 尚未完成，无法重新执行")

    task.is_finished = False
    task.enabled = True
    task.last_run = None
    task.last_status = None
    task.updated_at = datetime.now()
    await db.flush()

    job_id = await add_job(task.id, task.interval_seconds, task.task_type, task.run_time)
    task.job_id = job_id
    await db.flush()

    return _to_task_info(task)


@router.post("/{task_id}/stop", response_model=TaskInfo)
async def stop_task(
    task_id: int,
    db: AsyncSession = Depends(get_db),
):
    """停止定时任务（从调度器移除，保留配置）。"""
    task = await get_task(db, task_id)
    if not task:
        raise HTTPException(status_code=404, detail=f"任务 {task_id} 不存在")

    await remove_job(task_id)
    task = await disable_task(db, task_id)

    return _to_task_info(task)


@router.post("/{task_id}/start", response_model=TaskInfo)
async def start_task(
    task_id: int,
    db: AsyncSession = Depends(get_db),
):
    """重新启动已停止的定时任务。"""
    task = await get_task(db, task_id)
    if not task:
        raise HTTPException(status_code=404, detail=f"任务 {task_id} 不存在")

    await enable_task(db, task_id)
    await add_job(task.id, task.interval_seconds, task.task_type, task.run_time)

    return _to_task_info(task)


@router.delete("/{task_id}")
async def delete_existing_task(
    task_id: int,
    db: AsyncSession = Depends(get_db),
):
    """删除定时任务（同时从调度器移除）。"""
    task = await get_task(db, task_id)
    if not task:
        raise HTTPException(status_code=404, detail=f"任务 {task_id} 不存在")

    await remove_job(task_id)
    await delete_task(db, task_id)

    return {"message": f"任务 {task_id} 已删除"}


@router.post("/{task_id}/update-interval", response_model=TaskInfo)
async def update_interval(
    task_id: int,
    interval_seconds: int,
    db: AsyncSession = Depends(get_db),
):
    """更新任务的轮询间隔。"""
    task = await get_task(db, task_id)
    if not task:
        raise HTTPException(status_code=404, detail=f"任务 {task_id} 不存在")

    task.interval_seconds = interval_seconds
    task.updated_at = datetime.now()
    await db.flush()

    if task.enabled and await is_job_running(task_id):
        await remove_job(task_id)
        await add_job(task.id, task.interval_seconds, task.task_type, task.run_time)

    return _to_task_info(task)