import { createFileRoute, useNavigate } from "@tanstack/react-router";
import { useGetRoleById, useGetRolePermissions } from "@/hooks/queries";
import {
  Card,
  CardContent,
  CardDescription,
  CardHeader,
  CardTitle,
} from "@/components/ui/card";
import { Button } from "@/components/ui/button";
import { Badge } from "@/components/ui/badge";
import { Shield, ArrowLeft, Check, X } from "lucide-react";
import type { PermissionOnRole } from "@/types/permission";

export const Route = createFileRoute("/_auth/user/role/$roleId/")({
  head: () => ({
    meta: [{ title: "Quyền của người dùng | AccessControl" }]
  }),
  component: ViewRolePermissionsComponent,
  loader: async ({ context, params }) => {
    context.breadcrumbs = [
      {
        title: "Quản lý tài khoản",
        path: "#"
      },
      {
        title: "Danh sách người dùng",
        path: "/user"
      },
      {
        title: "Quyền của người dùng",
        path: `/user/role/${params.roleId}`
      }
    ];
  },
});

function ViewRolePermissionsComponent() {
  const { roleId } = Route.useParams();
  const navigate = useNavigate();
  const roleIdNum = parseInt(roleId, 10);

  const { data: role, isLoading: roleLoading } = useGetRoleById(roleIdNum);
  const { data: permissions = [], isLoading: permissionsLoading } = useGetRolePermissions(roleIdNum);

  const isLoading = roleLoading || permissionsLoading;

  // Group permissions by parent
  const groupedPermissions = (permissions as PermissionOnRole[]).reduce((acc, permission) => {
    if (permission.parentId === null) {
      if (!acc[permission.permisionId]) {
        acc[permission.permisionId] = { parent: permission, children: [] };
      } else {
        acc[permission.permisionId].parent = permission;
      }
    } else {
      if (!acc[permission.parentId]) {
        acc[permission.parentId] = { parent: null as any, children: [] };
      }
      acc[permission.parentId].children.push(permission);
    }
    return acc;
  }, {} as Record<number, { parent: PermissionOnRole; children: PermissionOnRole[] }>);

  if (isLoading) {
    return (
      <div className="flex items-center justify-center h-64">
        <div className="animate-spin rounded-full h-8 w-8 border-b-2 border-primary"></div>
      </div>
    );
  }

  return (
    <div className="w-full px-6 space-y-4">
      <div className="flex items-center gap-4">
        <Button variant="ghost" size="sm" onClick={() => navigate({ to: "/user" })}>
          <ArrowLeft className="h-4 w-4 mr-2" />
          Quay lại
        </Button>
      </div>

      <Card>
        <CardHeader>
          <CardTitle className="flex items-center gap-2">
            <Shield className="h-5 w-5" />
            Quyền hạn của Role: {role?.roleName || `#${roleId}`}
          </CardTitle>
          <CardDescription>
            Danh sách các quyền được gán cho role này
            {role?.priority !== undefined && (
              <span className="ml-2">(Độ ưu tiên: <Badge variant="outline">{role.priority}</Badge>)</span>
            )}
          </CardDescription>
        </CardHeader>
        <CardContent>
          {permissions.length === 0 ? (
            <div className="text-center text-muted-foreground py-8">Không có quyền nào được gán cho role này</div>
          ) : (
            <div className="space-y-6">
              {Object.values(groupedPermissions).map(({ parent, children }) => (
                <div key={parent?.permisionId} className="border rounded-lg p-4">
                  <div className="flex items-center justify-between mb-3">
                    <div className="flex items-center gap-2">
                      <span className="font-semibold text-lg">{parent?.permissionName || "Allow all"}</span>
                      <Badge variant="secondary" className="text-xs">{parent?.permissionCode}</Badge>
                    </div>
                    <div className="flex items-center gap-1">
                      {(parent?.isChecked === 1 || parent === null) ? (
                        <Badge variant="default" className="bg-green-600">
                          <Check className="h-3 w-3 mr-1" />Đã bật
                        </Badge>
                      ) : (
                        <Badge variant="secondary">
                          <X className="h-3 w-3 mr-1" />Đã tắt
                        </Badge>
                      )}
                    </div>
                  </div>

                  {children.length > 0 && (
                    <div className="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-2 mt-3 pl-4 border-l-2 border-muted">
                      {children.map((child) => (
                        <div key={child.permisionId} className="flex items-center justify-between p-2 rounded bg-muted/50">
                          <div className="flex flex-col">
                            <span className="text-sm font-medium">{child.permissionName}</span>
                            <span className="text-xs text-muted-foreground">{child.permissionCode}</span>
                          </div>
                          {child.isChecked === 1 ? (
                            <Check className="h-4 w-4 text-green-600" />
                          ) : (
                            <X className="h-4 w-4 text-muted-foreground" />
                          )}
                        </div>
                      ))}
                    </div>
                  )}
                </div>
              ))}
            </div>
          )}
        </CardContent>
      </Card>
    </div>
  );
}