"use client";

/**
 * 班级邀请码管理 - 客户端组件（ARCHITECTURE.md §7.3 / §9.4 / §10 P5）
 *
 * 数据契约：
 * - useClassInvitationCodes / useGenerateClassInvitationCode / useRevokeClassInvitationCode
 *   ❌ schema 无对应根字段 → MSW 兜底（@contract-pending）
 *
 * 功能：
 * - 列出班级所有邀请码（含状态/有效期/使用次数）
 * - 生成自定义邀请码（可选有效期/次数/备注）
 * - 撤销邀请码（软删除）
 * - 复制邀请码到剪贴板
 *
 * 关联：ARCHITECTURE.md §5.3 / §5.4 / §7.3 / §9.4 / §10 P5 / §11.3 / §11.4
 */
import { useState } from "react";
import { Ban, Copy, Plus } from "lucide-react";
import { useTranslations } from "next-intl";

import {
  useGenerateClassInvitationCode,
  useRevokeClassInvitationCode,
  useClassInvitationCodes,
  type ClassInvitationCode,
} from "@/lib/api";
import { notify } from "@/shared/lib/notify";
import {
  AlertDialog,
  AlertDialogAction,
  AlertDialogCancel,
  AlertDialogContent,
  AlertDialogDescription,
  AlertDialogFooter,
  AlertDialogHeader,
  AlertDialogTitle,
} from "@/shared/components/ui/alert-dialog";
import { Badge } from "@/shared/components/ui/badge";
import { Button } from "@/shared/components/ui/button";
import {
  Dialog,
  DialogContent,
  DialogDescription,
  DialogFooter,
  DialogHeader,
  DialogTitle,
} from "@/shared/components/ui/dialog";
import { Input } from "@/shared/components/ui/input";
import { FormField } from "@/features/admin/school/schools-client";

// ── ClassInvitationManagerDialog ────────────────────────────────

/**
 * 班级邀请码管理对话框。
 *
 * - 列表查询：useClassInvitationCodes(classId)
 * - 生成：useGenerateClassInvitationCode，自定义有效期/次数/备注
 * - 撤销：useRevokeClassInvitationCode，软删除
 * - 复制：navigator.clipboard.writeText
 *
 * 子对话框：GenerateCodeDialog（生成新邀请码）
 */
export function ClassInvitationManagerDialog({
  open,
  classId,
  className,
  onClose,
}: {
  open: boolean;
  classId: string;
  className: string;
  onClose: () => void;
}): React.ReactElement | null {
  const t = useTranslations("admin.school.classes.invitation");
  const tCommon = useTranslations("common");
  const {
    data: codes,
    loading,
    error,
    refetch,
  } = useClassInvitationCodes(classId);
  const revokeMutation = useRevokeClassInvitationCode();

  const [generateOpen, setGenerateOpen] = useState(false);
  const [revokeTarget, setRevokeTarget] = useState<ClassInvitationCode | null>(
    null,
  );

  const handleCopy = async (code: string): Promise<void> => {
    try {
      await navigator.clipboard.writeText(code);
      notify.success(t("copied"));
    } catch (err) {
      notify.error(tCommon("error.loadFailed", { message: String(err) }));
    }
  };

  const handleRevoke = async (): Promise<void> => {
    if (!revokeTarget) return;
    try {
      await revokeMutation.run(revokeTarget.id);
      notify.success(t("revokeSuccess"));
      setRevokeTarget(null);
      void refetch();
    } catch (err) {
      notify.error(tCommon("error.loadFailed", { message: String(err) }));
    }
  };

  const handleGenerated = (): void => {
    void refetch();
  };

  if (!open) return null;

  return (
    <Dialog
      open={open}
      onOpenChange={(o) => {
        if (!o) onClose();
      }}
    >
      <DialogContent className="flex max-h-[90vh] max-w-3xl flex-col p-6">
        <DialogHeader>
          <DialogTitle>{t("title")}</DialogTitle>
          <DialogDescription className="sr-only">
            {t("title")}
          </DialogDescription>
          {className ? (
            <p className="text-xs text-muted-foreground">
              {t("classLabel")}: {className}
            </p>
          ) : null}
        </DialogHeader>
        <div className="flex justify-end">
          <Button size="sm" onClick={() => setGenerateOpen(true)}>
            <Plus className="mr-1.5 size-4" />
            {t("generate")}
          </Button>
        </div>

        <div className="flex-1 overflow-y-auto">
          {loading ? (
            <div className="py-12 text-center text-sm text-muted-foreground">
              {tCommon("loading")}
            </div>
          ) : error ? (
            <div className="rounded-xl border border-destructive/30 bg-destructive/5 p-6 text-center">
              <p className="text-sm text-destructive">
                {tCommon("error.loadFailed", { message: String(error) })}
              </p>
            </div>
          ) : codes && codes.length > 0 ? (
            <div className="overflow-x-auto rounded-xl border">
              <table className="w-full text-sm">
                <thead className="border-b bg-muted/30">
                  <tr>
                    <th className="p-3 text-left font-medium">
                      {t("colCode")}
                    </th>
                    <th className="p-3 text-left font-medium">
                      {t("colStatus")}
                    </th>
                    <th className="p-3 text-left font-medium">
                      {t("colUsedCount")}
                    </th>
                    <th className="p-3 text-left font-medium">
                      {t("colExpiresAt")}
                    </th>
                    <th className="p-3 text-left font-medium">
                      {t("colNote")}
                    </th>
                    <th className="p-3 text-right font-medium">
                      {t("colActions")}
                    </th>
                  </tr>
                </thead>
                <tbody className="divide-y">
                  {codes.map((record) => (
                    <tr key={record.id} className="hover:bg-muted/30">
                      <td className="p-3 font-mono font-medium tracking-wider">
                        {record.code}
                      </td>
                      <td className="p-3">
                        <InvitationStatusBadge status={record.status} />
                      </td>
                      <td className="p-3 text-sm">
                        {record.usedCount}
                        {record.maxUses !== null ? ` / ${record.maxUses}` : ""}
                      </td>
                      <td className="p-3 text-sm text-muted-foreground">
                        {record.expiresAt
                          ? new Date(record.expiresAt).toLocaleString()
                          : t("neverExpires")}
                      </td>
                      <td className="max-w-xs truncate p-3 text-sm text-muted-foreground">
                        {record.note ?? "-"}
                      </td>
                      <td className="p-3 text-right">
                        <div className="flex justify-end gap-1">
                          <Button
                            variant="ghost"
                            size="sm"
                            onClick={() => void handleCopy(record.code)}
                            aria-label={t("copy")}
                          >
                            <Copy className="size-4" />
                          </Button>
                          {record.status === "active" ? (
                            <Button
                              variant="ghost"
                              size="sm"
                              onClick={() => setRevokeTarget(record)}
                              aria-label={t("revoke")}
                            >
                              <Ban className="size-4" />
                            </Button>
                          ) : null}
                        </div>
                      </td>
                    </tr>
                  ))}
                </tbody>
              </table>
            </div>
          ) : (
            <div className="py-12 text-center text-sm text-muted-foreground">
              {t("empty")}
            </div>
          )}
        </div>

        <DialogFooter className="mt-4">
          <Button variant="outline" onClick={onClose}>
            {tCommon("form.close")}
          </Button>
        </DialogFooter>

        <GenerateCodeDialog
          open={generateOpen}
          classId={classId}
          onClose={() => setGenerateOpen(false)}
          onCreated={handleGenerated}
        />

        {revokeTarget ? (
          <AlertDialog
            open={true}
            onOpenChange={(o) => {
              if (!o && !revokeMutation.loading) setRevokeTarget(null);
            }}
          >
            <AlertDialogContent>
              <AlertDialogHeader>
                <AlertDialogTitle>{t("revoke")}</AlertDialogTitle>
                <AlertDialogDescription>
                  {t("revokeConfirm")}
                </AlertDialogDescription>
              </AlertDialogHeader>
              <AlertDialogFooter>
                <AlertDialogCancel
                  disabled={revokeMutation.loading}
                  onClick={() => setRevokeTarget(null)}
                >
                  {tCommon("form.cancel")}
                </AlertDialogCancel>
                <AlertDialogAction
                  disabled={revokeMutation.loading}
                  onClick={() => void handleRevoke()}
                >
                  {revokeMutation.loading
                    ? tCommon("form.processing")
                    : t("revoke")}
                </AlertDialogAction>
              </AlertDialogFooter>
            </AlertDialogContent>
          </AlertDialog>
        ) : null}
      </DialogContent>
    </Dialog>
  );
}

// ── InvitationStatusBadge ───────────────────────────────────────

/**
 * 邀请码状态徽章。
 *
 * - active：默认变体（primary 色）
 * - 其他（used/expired/revoked）：secondary 变体
 */
function InvitationStatusBadge({
  status,
}: {
  status: string;
}): React.ReactElement {
  const t = useTranslations("admin.school.classes.invitation");
  const variant = status === "active" ? "default" : "secondary";
  const label =
    status === "active" ||
    status === "used" ||
    status === "expired" ||
    status === "revoked"
      ? t(`status.${status}`)
      : status;
  return <Badge variant={variant}>{label}</Badge>;
}

// ── GenerateCodeDialog ──────────────────────────────────────────

/**
 * 生成新邀请码对话框。
 *
 * 字段：有效期（小时）/ 最大使用次数 / 备注
 * 全部可选，留空则生成无限制邀请码。
 */
function GenerateCodeDialog({
  open,
  classId,
  onClose,
  onCreated,
}: {
  open: boolean;
  classId: string;
  onClose: () => void;
  onCreated: () => void;
}): React.ReactElement | null {
  const t = useTranslations("admin.school.classes.invitation");
  const tCommon = useTranslations("common");
  const generateMutation = useGenerateClassInvitationCode();

  const [expiresInHours, setExpiresInHours] = useState<string>("");
  const [maxUses, setMaxUses] = useState<string>("");
  const [note, setNote] = useState<string>("");

  const handleSubmit = async (
    e: React.FormEvent<HTMLFormElement>,
  ): Promise<void> => {
    e.preventDefault();
    if (!classId) return;

    try {
      await generateMutation.run({
        classId,
        expiresInHours: expiresInHours ? Number(expiresInHours) : null,
        maxUses: maxUses ? Number(maxUses) : null,
        note: note.trim() || null,
      });
      notify.success(t("generateSuccess"));
      setExpiresInHours("");
      setMaxUses("");
      setNote("");
      onCreated();
      onClose();
    } catch (err) {
      notify.error(tCommon("error.loadFailed", { message: String(err) }));
    }
  };

  if (!open) return null;

  return (
    <Dialog
      open={open}
      onOpenChange={(o) => {
        if (!o) onClose();
      }}
    >
      <DialogContent className="max-w-md">
        <DialogHeader>
          <DialogTitle>{t("generateWithCustom")}</DialogTitle>
          <DialogDescription>
            {t("defaultDuration")} · {t("defaultMaxUses")}
          </DialogDescription>
        </DialogHeader>
        <form onSubmit={handleSubmit} className="space-y-4">
          <FormField label={t("expiresInHours")}>
            <Input
              type="number"
              min="1"
              value={expiresInHours}
              onChange={(e) => setExpiresInHours(e.target.value)}
              placeholder={t("defaultDuration")}
            />
          </FormField>
          <FormField label={t("maxUsesLabel")}>
            <Input
              type="number"
              min="1"
              value={maxUses}
              onChange={(e) => setMaxUses(e.target.value)}
              placeholder={t("defaultMaxUses")}
            />
          </FormField>
          <FormField label={t("customNote")}>
            <Input
              type="text"
              value={note}
              onChange={(e) => setNote(e.target.value)}
              placeholder={t("customNotePlaceholder")}
              maxLength={255}
            />
          </FormField>
          <DialogFooter>
            <Button
              type="button"
              variant="outline"
              onClick={onClose}
              disabled={generateMutation.loading}
            >
              {tCommon("form.cancel")}
            </Button>
            <Button type="submit" disabled={generateMutation.loading}>
              {generateMutation.loading
                ? tCommon("form.processing")
                : t("generate")}
            </Button>
          </DialogFooter>
        </form>
      </DialogContent>
    </Dialog>
  );
}