import hashlib
from typing import Union

from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import JSONResponse
from fastapi.security import HTTPBearer, HTTPAuthorizationCredentials

from app.core.auth import get_current_user
from app.core.database import get_db_connection
from app.models.models import LoginRequest, LoginResponse
from app.services.jwt_service import jwt_service
from app.core.response import create_api_response

security = HTTPBearer()

router = APIRouter()

def hash_password(password: str) -> str:
    return hashlib.sha256(password.encode()).hexdigest()

@router.post("/auth/login")
def login(request: LoginRequest):
    with get_db_connection() as connection:
        cursor = connection.cursor(dictionary=True)
        
        query = "SELECT user_id, username, caption, email, password_hash, role_id FROM users WHERE username = %s"
        cursor.execute(query, (request.username,))
        user = cursor.fetchone()
        
        if not user:
            return create_api_response(code="401", message="用户名或密码错误")
        
        hashed_input = hash_password(request.password)
        if user['password_hash'] != hashed_input:
            return create_api_response(code="401", message="用户名或密码错误")
        
        # 创建JWT token
        token_data = {
            "user_id": user['user_id'],
            "username": user['username'],
            "caption": user['caption'],
            "role_id": user['role_id']
        }
        token = jwt_service.create_access_token(token_data)
        
        login_response_data = LoginResponse(
            user_id=user['user_id'],
            username=user['username'],
            caption=user['caption'],
            email=user['email'],
            token=token,
            role_id=user['role_id']
        )
        
        return create_api_response(
            code="200", 
            message="登录成功", 
            data=login_response_data.dict()
        )

@router.post("/auth/logout")
def logout(credentials: HTTPAuthorizationCredentials = Depends(security)):
    """登出接口，撤销当前token"""
    token = credentials.credentials

    payload = jwt_service.verify_token(token)
    if not payload:
        return create_api_response(code="401", message="无效或过期的token")

    user_id = payload.get("user_id")
    if not user_id:
        return create_api_response(code="401", message="无效的token payload")

    revoked = jwt_service.revoke_token(token, user_id)

    if revoked:
        return create_api_response(code="200", message="登出成功")
    else:
        return create_api_response(code="400", message="已经登出或token未找到")


@router.post("/auth/logout-all")
def logout_all(current_user: dict = Depends(get_current_user)):
    """登出所有设备"""
    user_id = current_user["user_id"]
    revoked_count = jwt_service.revoke_all_user_tokens(user_id)
    return create_api_response(code="200", message=f"从 {revoked_count} 个设备登出")


@router.post("/auth/admin/revoke-user-tokens/{user_id}")
def admin_revoke_user_tokens(
    user_id: int, credentials: HTTPAuthorizationCredentials = Depends(security)
):
    """管理员功能：撤销指定用户的所有token"""
    token = credentials.credentials

    payload = jwt_service.verify_token(token)
    if not payload:
        return create_api_response(code="401", message="无效或过期的token")

    admin_user_id = payload.get("user_id")
    if not admin_user_id:
        return create_api_response(code="401", message="无效的token payload")

    # 这里可以添加管理员权限检查，目前暂时允许任何登录用户操作
    # if payload.get('role_id') != ADMIN_ROLE_ID:
    #     return create_api_response(code="403", message="需要管理员权限")

    revoked_count = jwt_service.revoke_all_user_tokens(user_id)
    return create_api_response(
        code="200", message=f"为用户 {user_id} 撤销了 {revoked_count} 个token"
    )


@router.get("/auth/me")
def get_me(current_user: dict = Depends(get_current_user)):
    """获取当前用户信息"""
    return create_api_response(code="200", message="获取用户信息成功", data=current_user)


@router.post("/auth/refresh")
def refresh_token(current_user: dict = Depends(get_current_user)):
    """刷新token"""
    token_data = {
        "user_id": current_user["user_id"],
        "username": current_user["username"],
        "caption": current_user["caption"],
        "role_id": current_user["role_id"],
    }
    new_token = jwt_service.create_access_token(token_data)
    return create_api_response(
        code="200", message="Token刷新成功", data={"token": new_token}
    )