from django.shortcuts import get_object_or_404
from django.utils import timezone
from rest_framework.views import APIView
from rest_framework.response import Response
from rest_framework.permissions import IsAdminUser
from tracker.api.envelope import EnvelopeMixin, ok
from tracker.models import Site


def _norm_domains(raw) -> list[str]:
    """域名归一：去协议/端口/路径、转小写、去空去重。"""
    if isinstance(raw, str) or not isinstance(raw, (list, tuple)):
        return []   # 标量/字符串（会逐字符迭代成单字符域名）→ 走 invalid_domains 400
    out = []
    for d in raw:
        d = str(d).strip().lower()
        for pre in ("https://", "http://"):
            if d.startswith(pre):
                d = d[len(pre):]
        d = d.split("/")[0].split(":")[0]
        if d and d not in out:
            out.append(d)
    return out


def _to_bool(v) -> bool:
    """宽松布尔解析：bool 直通，"true"/"false" 字符串按字面（bool("false") 是 True，
    对 allow_no_origin 这类放宽开关方向不利），其余（数字/未知串/None）一律 False。"""
    if isinstance(v, bool):
        return v
    if isinstance(v, str) and v.lower() in ("true", "false"):
        return v.lower() == "true"
    return False


def _serialize(site: Site) -> dict:
    # USE_TZ=True 下 isoformat() 是 UTC（"+00:00"），前端直接切串显示会与
    # Dashboard 的上海自然日口径同屏矛盾——统一按上海时区序列化。
    return {"id": site.pk, "name": site.name, "site_id": site.site_id,
            "domains": site.domains, "allow_no_origin": site.allow_no_origin,
            "is_active": site.is_active,
            "created_at": timezone.localtime(site.created_at).isoformat()}


class SiteListView(EnvelopeMixin, APIView):
    def get(self, request):
        return ok([_serialize(s) for s in Site.objects.order_by("-created_at")])

    def post(self, request):
        data = request.data if isinstance(request.data, dict) else {}   # JSON 数组等畸形 body → 空表（.get 会 500）
        name = data.get("name")
        if not isinstance(name, str) or not name.strip():
            return Response({"code": 400, "data": None, "message": "invalid_name"}, status=400)
        domains = _norm_domains(data.get("domains"))
        if not domains:
            return Response({"code": 400, "data": None, "message": "invalid_domains"}, status=400)
        site = Site.objects.create(name=name.strip()[:100], domains=domains,
                                   allow_no_origin=_to_bool(data.get("allow_no_origin")))
        return ok(_serialize(site), "created")


class SiteDetailView(EnvelopeMixin, APIView):
    def get_permissions(self):
        # DELETE（软删）仅 admin；PATCH 登录成员即可（settings 默认 IsAuthenticated；无 detail GET，前端走列表）。
        # 在 initial() 阶段判权限：403 先于 404，且不泄露站点存在性。
        if self.request.method == "DELETE":
            return [IsAdminUser()]
        return super().get_permissions()

    def _get(self, request, pk):
        return get_object_or_404(Site, pk=pk)

    def patch(self, request, pk):
        site = self._get(request, pk)
        data = request.data if isinstance(request.data, dict) else {}
        if "name" in data:
            name = data["name"]
            if not isinstance(name, str) or not name.strip():
                return Response({"code": 400, "data": None, "message": "invalid_name"}, status=400)
            site.name = name.strip()[:100]
        if "domains" in data:
            domains = _norm_domains(data["domains"])
            if not domains:
                return Response({"code": 400, "data": None, "message": "invalid_domains"}, status=400)
            site.domains = domains
        if "allow_no_origin" in data:
            site.allow_no_origin = _to_bool(data["allow_no_origin"])
        if "is_active" in data:
            site.is_active = _to_bool(data["is_active"])
        site.save()
        return ok(_serialize(site))

    def delete(self, request, pk):
        # 软删：默认停用即可（上报侧 collect 见 is_active=False 即 403，Task7 联动）。
        # 物理清除走未来管理命令分批删——大站单语句级联删除有锁表/binlog 风暴风险，
        # CASCADE 仅作完整性兜底，不在请求路径触发。
        site = self._get(request, pk)
        site.is_active = False
        site.save(update_fields=["is_active", "updated_at"])
        return ok(_serialize(site), "deactivated")