from typing import Optional

from fastapi import APIRouter, Depends, Query, Response, status

from app.database import get_database, get_redis
from app.models.todo import (
    TodoCreate,
    TodoUpdate,
    TodoResponse,
    TodoListResponse,
    BatchRequest,
    BatchResponse,
    ToggleResponse,
)
from app.services.todo_service import TodoService

router = APIRouter(prefix="/api/todos", tags=["todos"])


def _get_service(
    db=Depends(get_database),
    redis=Depends(get_redis),
) -> TodoService:
    return TodoService(db, redis)


# 중요: /batch를 /{id} 보다 위에 등록
@router.post("/batch", response_model=BatchResponse)
async def batch_action(
    data: BatchRequest,
    service: TodoService = Depends(_get_service),
):
    """F-019~F-021: 일괄 작업 (완료/삭제/카테고리 변경)"""
    return await service.batch_action(data)


@router.get("", response_model=TodoListResponse)
async def list_todos(
    page: int = Query(1, ge=1, description="페이지 번호"),
    limit: int = Query(20, ge=1, le=100, description="페이지당 항목 수"),
    completed: Optional[bool] = Query(None, description="완료 상태 필터"),
    category_id: Optional[str] = Query(None, description="카테고리 필터"),
    priority: Optional[str] = Query(None, description="우선순위 필터 (high/medium/low)"),
    tag: Optional[str] = Query(None, description="태그 필터"),
    sort: str = Query("created_at", description="정렬 기준 (created_at/due_date/priority)"),
    order: str = Query("desc", description="정렬 방향 (asc/desc)"),
    service: TodoService = Depends(_get_service),
):
    """F-002: 할일 목록 조회 (필터/정렬/페이지네이션)"""
    return await service.list_todos(
        page=page,
        limit=limit,
        completed=completed,
        category_id=category_id,
        priority=priority,
        tag=tag,
        sort=sort,
        order=order,
    )


@router.post("", response_model=TodoResponse, status_code=status.HTTP_201_CREATED)
async def create_todo(
    data: TodoCreate,
    service: TodoService = Depends(_get_service),
):
    """F-001: 할일 생성"""
    return await service.create_todo(data)


@router.get("/{todo_id}", response_model=TodoResponse)
async def get_todo(
    todo_id: str,
    service: TodoService = Depends(_get_service),
):
    """F-003: 할일 상세 조회"""
    return await service.get_todo(todo_id)


@router.put("/{todo_id}", response_model=TodoResponse)
async def update_todo(
    todo_id: str,
    data: TodoUpdate,
    service: TodoService = Depends(_get_service),
):
    """F-004: 할일 수정"""
    return await service.update_todo(todo_id, data)


@router.delete("/{todo_id}", status_code=status.HTTP_204_NO_CONTENT)
async def delete_todo(
    todo_id: str,
    service: TodoService = Depends(_get_service),
):
    """F-005: 할일 삭제"""
    await service.delete_todo(todo_id)
    return Response(status_code=status.HTTP_204_NO_CONTENT)


@router.patch("/{todo_id}/toggle", response_model=ToggleResponse)
async def toggle_todo(
    todo_id: str,
    service: TodoService = Depends(_get_service),
):
    """F-006: 할일 완료 토글"""
    return await service.toggle_todo(todo_id)