"use client";

import { useCallback, useEffect, useState } from "react";
import { readApiResponse } from "./wecom-user-picker";

type CustomerChat = {
  chatId: string;
  name: string;
  ownerUserId: string;
  memberCount: number;
  status: number;
};

type BindResult = {
  customerChatId: string;
  customerChatName: string;
  joinConfigId: string;
  joinQrCode: string;
  qrError?: string;
};

export function TaskCustomerChatModal({
  task,
  onClose,
  onBound,
}: {
  task: { id: string; name: string; customerChatId: string; customerChatName: string };
  onClose: () => void;
  onBound: () => void;
}) {
  const [chats, setChats] = useState<CustomerChat[]>([]);
  const [boundChatId, setBoundChatId] = useState(task.customerChatId);
  const [loading, setLoading] = useState(true);
  const [saving, setSaving] = useState(false);
  const [error, setError] = useState("");
  const [notice, setNotice] = useState("");
  const [selectedChatId, setSelectedChatId] = useState(task.customerChatId);
  const [bindResult, setBindResult] = useState<BindResult | null>(null);

  const loadChats = useCallback(async () => {
    setLoading(true);
    setError("");
    try {
      const response = await fetch("/api/action", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({ action: "task_customer_chats", taskId: task.id }),
      });
      const parsed = await readApiResponse<{
        chats?: CustomerChat[];
        boundChatId?: string;
        error?: string;
      }>(response, "获取客户群列表失败");
      if (!response.ok) {
        throw new Error(parsed.error || "获取客户群列表失败");
      }
      setChats(Array.isArray(parsed.chats) ? parsed.chats : []);
      const bound = String(parsed.boundChatId ?? "");
      setBoundChatId(bound);
      setSelectedChatId(bound);
    } catch (reason) {
      setError(reason instanceof Error ? reason.message : "获取客户群列表失败");
    } finally {
      setLoading(false);
    }
  }, [task.id]);

  useEffect(() => {
    const timer = window.setTimeout(() => {
      void loadChats();
    }, 0);
    return () => window.clearTimeout(timer);
  }, [loadChats]);

  const submitBind = async (chatId: string) => {
    const chat = chats.find((item) => item.chatId === chatId);
    setSaving(true);
    setError("");
    setNotice("");
    try {
      const response = await fetch("/api/action", {
        method: "POST",
        headers: { "Content-Type": "application/json" },
        body: JSON.stringify({
          action: "task_bind_customer_chat",
          taskId: task.id,
          chatId,
          chatName: chat?.name ?? "",
        }),
      });
      const parsed = await readApiResponse<{ task?: BindResult; error?: string }>(
        response,
        "绑定客户群失败",
      );
      if (!response.ok) {
        throw new Error(parsed.error || "绑定客户群失败");
      }
      const result = parsed.task ?? null;
      setBindResult(result);
      setBoundChatId(chatId);
      setSelectedChatId(chatId);
      setNotice(
        chatId
          ? result?.qrError
            ? `已绑定，但${result.qrError}，可重新保存刷新`
            : `已绑定「${result?.customerChatName || chat?.name || chatId}」，认领人扫码即可进群`
          : "已解绑，认领页不再展示进群二维码",
      );
      onBound();
    } catch (reason) {
      setError(reason instanceof Error ? reason.message : "绑定客户群失败");
    } finally {
      setSaving(false);
    }
  };

  const unbind = async () => {
    if (!window.confirm("解绑后认领页将不再展示进群二维码，确定解绑？")) return;
    await submitBind("");
  };

  return (
    <div className="modal-backdrop" role="presentation" onMouseDown={onClose}>
      <div
        className="modal-card wecom-picker-modal"
        onMouseDown={(event) => event.stopPropagation()}
      >
        <div className="modal-heading">
          <div>
            <h2>绑定客户群</h2>
            <p>
              列出任务负责人名下的企业微信客户群，绑定后生成进群活码，认领人在领取页扫码进群。
            </p>
          </div>
          <button type="button" onClick={onClose} aria-label="关闭">×</button>
        </div>
        <div className="import-guide-strip">
          <span className="wecom-picker-cache-hint">
            任务：{task.name}
            {boundChatId ? ` · 当前绑定：${task.customerChatName || boundChatId}` : " · 未绑定"}
          </span>
          <button
            type="button"
            className="ghost-button"
            onClick={() => void loadChats()}
            disabled={loading || saving}
          >
            {loading ? "拉取中…" : "刷新列表"}
          </button>
        </div>
        {error && <p className="form-error">{error}</p>}
        {notice && <p className="wecom-picker-cache-hint">{notice}</p>}
        {bindResult?.joinQrCode && (
          <div className="join-qr-preview">
            <img src={bindResult.joinQrCode} alt="进群活码" />
            <span>进群活码（已同步展示在认领页）</span>
          </div>
        )}
        <div className="wecom-picker-list">
          {loading ? (
            <div className="wecom-picker-empty">正在拉取负责人名下客户群…</div>
          ) : chats.length === 0 ? (
            <div className="wecom-picker-empty">
              未拉取到客户群——请任务负责人先在企微客户端创建客户群（内外部成员都可拉入），
              再点击「刷新列表」。
            </div>
          ) : (
            chats.map((chat) => {
              const isBound = chat.chatId === boundChatId;
              return (
                <label key={chat.chatId} className="wecom-picker-row">
                  <span className="wecom-picker-avatar placeholder" aria-hidden="true">
                    {(chat.name || chat.chatId).slice(0, 1)}
                  </span>
                  <span className="wecom-picker-meta">
                    <span className="wecom-picker-name">{chat.name || chat.chatId}</span>
                    <span className="wecom-picker-sub">{chat.memberCount} 人</span>
                    <code className="wecom-picker-id">{chat.chatId}</code>
                  </span>
                  <input
                    type="radio"
                    name="customer-chat"
                    checked={selectedChatId === chat.chatId}
                    onChange={() => setSelectedChatId(chat.chatId)}
                  />
                  {isBound ? <span className="wecom-picker-current">已绑定</span> : null}
                </label>
              );
            })
          )}
        </div>
        <div className="modal-actions">
          {boundChatId ? (
            <button
              type="button"
              className="ghost-button"
              onClick={() => void unbind()}
              disabled={saving}
            >
              解绑当前群
            </button>
          ) : null}
          <button type="button" className="ghost-button" onClick={onClose} disabled={saving}>
            关闭
          </button>
          <button
            type="button"
            className="primary-button"
            onClick={() => void submitBind(selectedChatId)}
            disabled={saving || loading || !selectedChatId || selectedChatId === boundChatId}
          >
            {saving ? "保存中…" : selectedChatId === boundChatId ? "已绑定" : "绑定所选群"}
          </button>
        </div>
      </div>
    </div>
  );
}