"use client";

import { useCallback, useEffect, useState } from "react";
import { apiFetch, ApiError } from "@/lib/api";
import { useToast } from "@/components/toast";
import { DataTable, type Column } from "@/components/DataTable";
import { Button, Card, ConfirmDialog, PageHeader } from "@/components/ui";
import { TrashIcon } from "@/components/icons";
import { toFa } from "@/lib/utils";

interface Feedback {
  id: number;
  stars?: number | null;
  content?: string | null;
  created_at?: string;
  user?: {
    name?: string | null;
    identifier?: string | null;
    mobile?: string | null;
  } | null;
}

interface Summary {
  total: number;
  rated: number;
  with_comment: number;
  average_stars: number;
}

interface AdminResponse {
  summary: Summary;
  feedback: { data: Feedback[] };
}

function Stars({ value }: { value?: number | null }) {
  if (!value) return <span className="text-muted">—</span>;
  return (
    <span className="text-amber-500" dir="ltr" title={toFa(value)}>
      {"★".repeat(value)}
      <span className="text-border">{"★".repeat(5 - value)}</span>
    </span>
  );
}

function userName(u: Feedback["user"]): string {
  return u?.name || u?.identifier || u?.mobile || "—";
}

function faDate(value?: string): string {
  if (!value) return "—";
  try {
    return toFa(new Date(value).toLocaleDateString("fa-IR"));
  } catch {
    return "—";
  }
}

export default function AppFeedbackPage() {
  const toast = useToast();

  const [rows, setRows] = useState<Feedback[]>([]);
  const [summary, setSummary] = useState<Summary | null>(null);
  const [loading, setLoading] = useState(true);
  const [error, setError] = useState<string | null>(null);

  const [deleting, setDeleting] = useState<Feedback | null>(null);
  const [removing, setRemoving] = useState(false);

  // Fetch without touching state synchronously (safe to call from an effect).
  const fetchFeedback = useCallback(() => {
    return apiFetch<AdminResponse>("/admin/app-feedback")
      .then((res) => {
        setRows(res.feedback?.data ?? []);
        setSummary(res.summary ?? null);
        setError(null);
      })
      .catch((e: unknown) =>
        setError(e instanceof ApiError ? e.message : "خطا در دریافت اطلاعات"),
      )
      .finally(() => setLoading(false));
  }, []);

  // Reload triggered by user actions (retry / after delete): show the spinner.
  const reload = useCallback(() => {
    setLoading(true);
    setError(null);
    fetchFeedback();
  }, [fetchFeedback]);

  useEffect(() => {
    fetchFeedback();
  }, [fetchFeedback]);

  async function confirmDelete() {
    if (!deleting) return;
    setRemoving(true);
    try {
      await apiFetch(`/admin/app-feedback/${deleting.id}`, { method: "DELETE" });
      toast.success("بازخورد حذف شد.");
      setDeleting(null);
      reload();
    } catch (err) {
      toast.error(err instanceof ApiError ? err.message : "خطا در حذف");
    } finally {
      setRemoving(false);
    }
  }

  const columns: Column<Feedback>[] = [
    { key: "id", header: "شناسه", render: (r) => toFa(r.id), className: "w-20" },
    { key: "user", header: "کاربر", render: (r) => userName(r.user) },
    {
      key: "stars",
      header: "امتیاز",
      className: "w-28",
      render: (r) => <Stars value={r.stars} />,
    },
    {
      key: "content",
      header: "ایده / نظر",
      render: (r) => r.content || <span className="text-muted">—</span>,
    },
    {
      key: "created_at",
      header: "تاریخ",
      className: "w-32",
      render: (r) => faDate(r.created_at),
    },
  ];

  return (
    <div>
      <PageHeader
        title="نظرات و ایده‌ها"
        subtitle="بازخورد کاربران درباره برنامه"
      />

      {summary && (
        <div className="mb-6 grid grid-cols-2 gap-3 sm:grid-cols-4">
          <Card>
            <p className="text-sm text-muted">میانگین امتیاز</p>
            <p className="mt-1 text-2xl font-bold text-foreground">
              {toFa(summary.average_stars)} <span className="text-amber-500">★</span>
            </p>
          </Card>
          <Card>
            <p className="text-sm text-muted">کل بازخوردها</p>
            <p className="mt-1 text-2xl font-bold text-foreground">
              {toFa(summary.total)}
            </p>
          </Card>
          <Card>
            <p className="text-sm text-muted">دارای امتیاز</p>
            <p className="mt-1 text-2xl font-bold text-foreground">
              {toFa(summary.rated)}
            </p>
          </Card>
          <Card>
            <p className="text-sm text-muted">دارای نظر</p>
            <p className="mt-1 text-2xl font-bold text-foreground">
              {toFa(summary.with_comment)}
            </p>
          </Card>
        </div>
      )}

      <DataTable
        columns={columns}
        rows={rows}
        loading={loading}
        error={error}
        onRetry={reload}
        emptyMessage="هنوز بازخوردی ثبت نشده است."
        actions={(row) => (
          <Button
            variant="ghost"
            onClick={() => setDeleting(row)}
            aria-label="حذف"
            className="text-danger"
          >
            <TrashIcon className="h-4 w-4" />
          </Button>
        )}
      />

      <ConfirmDialog
        open={!!deleting}
        message={`آیا از حذف بازخورد «${userName(deleting?.user)}» مطمئن هستید؟`}
        loading={removing}
        onConfirm={confirmDelete}
        onClose={() => setDeleting(null)}
      />
    </div>
  );
}