"""
异步任务 API 路由

提供异步任务的创建、查询、取消等操作
"""
from fastapi import APIRouter, Depends, HTTPException, status, BackgroundTasks
from typing import List, Optional, Dict, Any

from app.models.task import (
    AsyncTask,
    TaskCreateRequest,
    TaskResponse,
    TaskType,
    TaskStatus
)
from app.core.task_manager import get_task_manager, TaskManager
from app.utils.logger import get_logger

logger = get_logger(__name__)

router = APIRouter(prefix="/tasks", tags=["异步任务"])


@router.post("/", response_model=TaskResponse, status_code=status.HTTP_201_CREATED)
async def create_task(
    request: TaskCreateRequest,
    task_manager: TaskManager = Depends(get_task_manager)
):
    """
    创建新的异步任务

    创建后任务会立即返回任务ID，需要通过轮询 /tasks/{task_id} 来获取任务状态和结果
    """
    task = task_manager.create_task(
        task_type=request.type,
        params=request.params,
        project_id=request.project_id
    )

    return TaskResponse(
        id=task.id,
        type=task.type,
        status=task.status,
        progress=task.progress,
        result=task.result,
        error=task.error,
        project_id=task.project_id,
        created_at=task.created_at,
        updated_at=task.updated_at
    )


@router.get("/{task_id}", response_model=TaskResponse)
async def get_task(
    task_id: str,
    task_manager: TaskManager = Depends(get_task_manager)
):
    """获取任务详情"""
    task = task_manager.get_task(task_id)
    if not task:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"任务不存在: {task_id}"
        )

    return TaskResponse(
        id=task.id,
        type=task.type,
        status=task.status,
        progress=task.progress,
        result=task.result,
        error=task.error,
        project_id=task.project_id,
        created_at=task.created_at,
        updated_at=task.updated_at
    )


@router.get("/", response_model=List[TaskResponse])
async def list_tasks(
    task_type: Optional[TaskType] = None,
    project_id: Optional[str] = None,
    status: Optional[TaskStatus] = None,
    task_manager: TaskManager = Depends(get_task_manager)
):
    """
    列出任务

    支持按类型、项目ID、状态筛选
    """
    tasks = []

    if task_type:
        tasks = task_manager.get_tasks_by_type(task_type)
    elif project_id:
        tasks = task_manager.get_tasks_by_project(project_id)
    else:
        # 返回所有任务（最多100个）
        tasks = list(task_manager._tasks.values())[:100]

    # 状态筛选
    if status:
        tasks = [t for t in tasks if t.status == status]

    return [
        TaskResponse(
            id=t.id,
            type=t.type,
            status=t.status,
            progress=t.progress,
            result=t.result,
            error=t.error,
            project_id=t.project_id,
            created_at=t.created_at,
            updated_at=t.updated_at
        )
        for t in tasks
    ]


@router.post("/{task_id}/cancel", response_model=TaskResponse)
async def cancel_task(
    task_id: str,
    task_manager: TaskManager = Depends(get_task_manager)
):
    """取消任务"""
    success = task_manager.cancel_task(task_id)
    if not success:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"任务不存在: {task_id}"
        )

    task = task_manager.get_task(task_id)
    return TaskResponse(
        id=task.id,
        type=task.type,
        status=task.status,
        progress=task.progress,
        result=task.result,
        error=task.error,
        project_id=task.project_id,
        created_at=task.created_at,
        updated_at=task.updated_at
    )


@router.delete("/{task_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_task(
    task_id: str,
    task_manager: TaskManager = Depends(get_task_manager)
):
    """删除任务"""
    success = task_manager.delete_task(task_id)
    if not success:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail=f"任务不存在: {task_id}"
        )

    return None


@router.get("/project/{project_id}", response_model=List[TaskResponse])
async def get_project_tasks(
    project_id: str,
    task_manager: TaskManager = Depends(get_task_manager)
):
    """获取项目的所有任务"""
    tasks = task_manager.get_tasks_by_project(project_id)

    return [
        TaskResponse(
            id=t.id,
            type=t.type,
            status=t.status,
            progress=t.progress,
            result=t.result,
            error=t.error,
            project_id=t.project_id,
            created_at=t.created_at,
            updated_at=t.updated_at
        )
        for t in tasks
    ]