/**
 * Outbound 模块 - 消息发送
 * @module outbound
 */

import type { SendResult } from "./types.js";
import { chunkText } from "./utils/chunker.js";
import { createLogger } from "./utils/logger.js";

const MODULE = "outbound";

// 外部 Gateway 管理器 - 由 channel.ts 注入
let gatewayMap: Map<string, {
  sendText: (to: string, content: string, replyTo?: string) => Promise<{ success: boolean; messageId?: string; error?: string }>;
  sendMedia: (to: string, mediaUrl: string, text?: string, replyTo?: string) => Promise<{ success: boolean; messageId?: string; error?: string }>;
}> | null = null;

/**
 * 设置 Gateway 映射（由 channel.ts 调用）
 */
export function setGatewayMap(map: Map<string, never>): void {
  gatewayMap = map as unknown as typeof gatewayMap;
}

/**
 * 发送文本消息
 */
export async function sendText(options: {
  to: string;
  text: string;
  accountId: string;
  replyToId?: string;
}): Promise<SendResult> {
  const { to, text, accountId, replyToId } = options;
  const log = createLogger(MODULE);

  try {
    const gateway = gatewayMap?.get(accountId);
    if (!gateway) {
      return { messageId: "", error: "Gateway not available" };
    }

    // 获取分块限制
    const chunkLimit = 4000;
    const chunks = chunkText(text, { limit: chunkLimit, mode: "markdown" });

    if (chunks.length === 1) {
      const result = await gateway.sendText(to, text, replyToId);
      return {
        messageId: result.messageId ?? "",
        error: result.error,
      };
    }

    // 多块消息，逐块发送
    const messageIds: string[] = [];
    let lastError: string | undefined;

    for (let i = 0; i < chunks.length; i++) {
      const chunk = chunks[i];
      const chunkSuffix = chunks.length > 1 ? `\n\n--- [${i + 1}/${chunks.length}] ---` : "";
      const result = await gateway.sendText(to, chunk + chunkSuffix, replyToId);
      
      if (result.messageId) {
        messageIds.push(result.messageId);
      }
      if (result.error) {
        lastError = result.error;
      }

      // 块之间添加延迟
      if (i < chunks.length - 1) {
        await new Promise(resolve => setTimeout(resolve, 100));
      }
    }

    return {
      messageId: messageIds.join(","),
      error: lastError,
    };
  } catch (error) {
    const message = error instanceof Error ? error.message : String(error);
    log.error("Failed to send text", { to, error: message });
    return { messageId: "", error: message };
  }
}

/**
 * 发送媒体消息
 */
export async function sendMedia(options: {
  to: string;
  text?: string;
  mediaUrl: string;
  accountId: string;
  replyToId?: string;
}): Promise<SendResult> {
  const { to, text, mediaUrl, accountId, replyToId } = options;
  const log = createLogger(MODULE);

  try {
    const gateway = gatewayMap?.get(accountId);
    if (!gateway) {
      return { messageId: "", error: "Gateway not available" };
    }

    const result = await gateway.sendMedia(to, mediaUrl, text, replyToId);
    
    return {
      messageId: result.messageId ?? "",
      error: result.error,
    };
  } catch (error) {
    const message = error instanceof Error ? error.message : String(error);
    log.error("Failed to send media", { to, mediaUrl, error: message });
    return { messageId: "", error: message };
  }
}