# ✅ 授权管理接口：manager 给 user 授权网站 + 普通用户申请接口
from ninja import Router, Schema, Query
from pydantic import Field
from typing import List, Optional
from django.shortcuts import get_object_or_404
from django.db import models

from accounts.models import User
from websites.models import Website
from utils.auth import jwt_auth
from utils.permissions import manager_required, login_required

router = Router(tags=["授权管理"])


class WebsiteAccessRequest(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE)
    website = models.ForeignKey(Website, on_delete=models.CASCADE)
    status = models.CharField(
        max_length=20,
        choices=[("pending", "待审批"), ("approved", "已通过"), ("rejected", "已拒绝")],
        default="pending"
    )
    reason = models.TextField(blank=True)
    created_at = models.DateTimeField(auto_now_add=True)


class AuthorizeIn(Schema):
    user_id: int = Field(..., description="被授权的用户ID")
    website_ids: List[int] = Field(..., description="要授权的网站ID列表")


class AccessRequestIn(Schema):
    website_id: int = Field(...)
    reason: Optional[str] = Field(None, description="申请原因")


@router.post("/authorize", auth=jwt_auth)
@manager_required
def authorize_user(request, data: AuthorizeIn):
    manager = request.user
    target_user = get_object_or_404(User, id=data.user_id)

    if target_user.role != "user":
        return {"success": False, "message": "只能授权给普通用户"}

    managed_ids = set(manager.managed_websites.values_list("id", flat=True))
    for wid in data.website_ids:
        if wid not in managed_ids:
            return {"success": False, "message": f"无权授权网站ID：{wid}"}

    target_user.authorized_websites.add(*data.website_ids)

    # 如果用户曾申请过，设置为已批准
    WebsiteAccessRequest.objects.filter(user=target_user, website_id__in=data.website_ids).update(status="approved")

    return {
        "success": True,
        "message": f"已授权 {target_user.username} 访问 {len(data.website_ids)} 个网站",
    }


@router.post("/apply", auth=jwt_auth)
@login_required
def request_access(request, data: AccessRequestIn):
    user = request.user
    site = get_object_or_404(Website, id=data.website_id)

    # 不允许重复申请
    if WebsiteAccessRequest.objects.filter(user=user, website=site, status="pending").exists():
        return {"success": False, "message": "您已申请，正在等待审批"}

    WebsiteAccessRequest.objects.create(user=user, website=site, reason=data.reason or "")

    return {"success": True, "message": "申请已提交，等待分管理审批"}


@router.get("/pending", auth=jwt_auth)
@manager_required
def list_pending_requests(request):
    manager = request.user
    managed_ids = manager.managed_websites.values_list("id", flat=True)

    requests = WebsiteAccessRequest.objects.filter(website_id__in=managed_ids, status="pending")

    return {
        "success": True,
        "items": [
            {
                "id": r.id,
                "user": r.user.username,
                "website": r.website.name,
                "reason": r.reason,
                "created_at": r.created_at,
            }
            for r in requests
        ]
    }


@router.post("/approve", auth=jwt_auth)
@manager_required
def approve_request(request, request_id: int = Query(...), approve: bool = Query(True)):
    r = get_object_or_404(WebsiteAccessRequest, id=request_id)

    if r.website not in request.user.managed_websites.all():
        return {"success": False, "message": "无权审批此申请"}

    r.status = "approved" if approve else "rejected"
    r.save()

    if approve:
        r.user.authorized_websites.add(r.website)

    return {"success": True, "message": f"已{'通过' if approve else '拒绝'} {r.user.username} 的访问申请"}


@router.get("/my-sites", auth=jwt_auth)
@login_required
def list_my_authorized_websites(request):
    user = request.user
    sites = user.authorized_websites.all().values("id", "name", "db_alias")
    return {"success": True, "websites": list(sites)}


@router.get("/public-sites")
def list_public_websites(request):
    websites = Website.objects.all().values("id", "name", "db_alias", "description")
    return {"success": True, "websites": list(websites)}