from fastapi import APIRouter, Depends, HTTPException, File, UploadFile
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select, and_
from fastcrud import FastCRUD
from pathlib import Path
import os
import shutil
from datetime import datetime

from database import get_db
from models import SystemSetting, User
from schemas import (
    SystemSettingCreate,
    SystemSettingUpdate,
    SystemSettingResponse,
)
from middleware import get_current_user
from utils.like_filter import ilike_contains

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

# 创建FastCRUD实例
setting_crud = FastCRUD(SystemSetting, SystemSettingResponse)

# 图片存储目录
UPLOAD_DIR = Path(__file__).parent.parent.parent / "uploads"
UPLOAD_DIR.mkdir(exist_ok=True)


@router.post("/", response_model=SystemSettingResponse)
async def create_setting(
    setting_data: SystemSettingCreate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """创建设置项"""
    # 检查设置键名是否已存在
    result = await db.execute(select(SystemSetting).filter(SystemSetting.key == setting_data.key))
    existing_setting = result.scalar_one_or_none()
    if existing_setting:
        raise HTTPException(status_code=400, detail="设置键名已存在")

    # 创建设置实例
    db_setting = SystemSetting(
        key=setting_data.key,
        value=setting_data.value,
        type=setting_data.type or "string",
        options=setting_data.options,
        description=setting_data.description,
    )

    db.add(db_setting)
    await db.commit()
    await db.refresh(db_setting)

    return db_setting


@router.get("/", response_model=list[SystemSettingResponse])
async def get_settings(
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """获取所有设置项"""
    result = await db.execute(select(SystemSetting))
    settings = result.scalars().all()
    return [SystemSettingResponse.model_validate(s) for s in settings]


@router.get("/{setting_id}", response_model=SystemSettingResponse)
async def get_setting(
    setting_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """获取单个设置项"""
    setting = await setting_crud.get(db, id=setting_id)
    if not setting:
        raise HTTPException(status_code=404, detail="设置项不存在")
    return setting


@router.get("/key/{key}", response_model=SystemSettingResponse)
async def get_setting_by_key(
    key: str,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """根据键名获取设置项"""
    result = await db.execute(select(SystemSetting).filter(SystemSetting.key == key))
    setting = result.scalar_one_or_none()
    if not setting:
        raise HTTPException(status_code=404, detail="设置项不存在")
    return setting


@router.put("/{setting_id}", response_model=SystemSettingResponse)
async def update_setting(
    setting_id: int,
    setting_data: SystemSettingUpdate,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """更新设置项"""
    # 检查设置键名是否被其他设置使用
    if setting_data.key:
        result = await db.execute(
            select(SystemSetting).filter(SystemSetting.key == setting_data.key, SystemSetting.id != setting_id)
        )
        existing_setting = result.scalar_one_or_none()
        if existing_setting:
            raise HTTPException(status_code=400, detail="设置键名已存在")

    # 准备更新数据
    update_data = setting_data.model_dump(exclude_unset=True)

    # 使用FastCRUD更新设置
    updated_setting = await setting_crud.update(
        db, update_data, id=setting_id, schema_to_select=SystemSettingResponse, return_as_model=True
    )
    if not updated_setting:
        raise HTTPException(status_code=404, detail="设置项不存在")
    return updated_setting


@router.delete("/{setting_id}")
async def delete_setting(
    setting_id: int,
    db: AsyncSession = Depends(get_db),
    current_user: User = Depends(get_current_user),
):
    """删除设置项"""
    # 检查设置是否存在
    result = await db.execute(select(SystemSetting).filter(SystemSetting.id == setting_id))
    existing_setting = result.scalar_one_or_none()
    if not existing_setting:
        raise HTTPException(status_code=404, detail="设置项不存在")

    # 使用FastCRUD删除设置
    deleted = await setting_crud.delete(db, id=setting_id)
    return {"message": "设置项删除成功"}


@router.post("/upload")
async def upload_image(
    file: UploadFile = File(...),
    current_user: User = Depends(get_current_user),
):
    """上传图片"""
    # 检查文件类型
    if not file.filename or not file.filename.lower().endswith(('.png', '.jpg', '.jpeg', '.gif', '.webp')):
        raise HTTPException(status_code=400, detail="只支持图片格式（png, jpg, jpeg, gif, webp）")

    # 检查文件大小（2MB）
    file_size = 0
    chunk = await file.read(1024)
    while chunk:
        file_size += len(chunk)
        if file_size > 2 * 1024 * 1024:
            raise HTTPException(status_code=400, detail="文件大小不能超过2MB")
        chunk = await file.read(1024)
    
    # 重置文件指针
    await file.seek(0)

    # 生成文件名
    timestamp = datetime.now().strftime("%Y%m%d%H%M%S")
    ext = file.filename.split('.')[-1]
    filename = f"setting_{timestamp}.{ext}"
    file_path = UPLOAD_DIR / filename

    # 保存文件
    with open(file_path, "wb") as buffer:
        shutil.copyfileobj(file.file, buffer)

    # 返回文件路径
    return {"url": f"/uploads/{filename}"}