import type { DatabaseClient } from "./database";
import {
  addTaskJoinWay,
  deleteJoinWay,
  getJoinWayQrCode,
  updateTaskJoinWay,
  type WecomConfig,
} from "./wecom-client";

type FetchLike = typeof fetch;

function text(value: unknown) {
  return String(value ?? "").trim();
}

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

export async function bindTaskCustomerChat(
  db: DatabaseClient,
  params: { taskId: string; chatId: string; chatName: string },
  config: WecomConfig,
  fetchImpl: FetchLike = fetch,
): Promise<BindTaskCustomerChatResult> {
  const taskId = text(params.taskId);
  const chatId = text(params.chatId);
  const chatName = text(params.chatName).slice(0, 255);
  if (!taskId) throw new Error("缺少 taskId");
  if (!chatId) throw new Error("请选择要绑定的客户群");

  const task = await db
    .prepare("SELECT id, name, join_config_id FROM tasks WHERE id = ?")
    .bind(taskId)
    .first<{ id: string; name: string; join_config_id: string | null }>();
  if (!task) throw new Error("任务不存在");

  const joinInput = {
    chatIdList: [chatId],
    roomBaseName: task.name,
    state: `task-${taskId}`,
  };

  let configId = text(task.join_config_id);
  if (configId) {
    try {
      await updateTaskJoinWay(config, { ...joinInput, configId }, fetchImpl);
    } catch {
      // 活码配置可能已被企微侧清理，降级为重新创建
      configId = (await addTaskJoinWay(config, joinInput, fetchImpl)).configId;
    }
  } else {
    configId = (await addTaskJoinWay(config, joinInput, fetchImpl)).configId;
  }

  let joinQrCode = "";
  let qrError: string | undefined;
  try {
    joinQrCode = (await getJoinWayQrCode(config, configId, fetchImpl)).qrCode;
  } catch (error) {
    qrError = `活码二维码获取失败：${error instanceof Error ? error.message : String(error)}`;
  }

  await db
    .prepare(
      `UPDATE tasks
       SET customer_chat_id = ?, customer_chat_name = ?, join_config_id = ?, join_qr_code = ?
       WHERE id = ?`,
    )
    .bind(chatId, chatName, configId, joinQrCode, taskId)
    .run();

  return {
    customerChatId: chatId,
    customerChatName: chatName,
    joinConfigId: configId,
    joinQrCode,
    qrError,
  };
}

export async function unbindTaskCustomerChat(
  db: DatabaseClient,
  taskId: string,
  config: WecomConfig,
  fetchImpl: FetchLike = fetch,
): Promise<void> {
  const id = text(taskId);
  if (!id) throw new Error("缺少 taskId");
  const task = await db
    .prepare("SELECT join_config_id FROM tasks WHERE id = ?")
    .bind(id)
    .first<{ join_config_id: string | null }>();
  if (!task) throw new Error("任务不存在");
  const configId = text(task.join_config_id);
  if (configId) {
    await deleteJoinWay(config, configId, fetchImpl);
  }
  await db
    .prepare(
      `UPDATE tasks
       SET customer_chat_id = '', customer_chat_name = '', join_config_id = '', join_qr_code = ''
       WHERE id = ?`,
    )
    .bind(id)
    .run();
}