import express, { Application } from 'express';
import axios from 'axios';
import { getHandler } from './chatHandlers';
import { addMessageToConversation } from './store/conversation';
import { WhatsAppMessage, Conversation } from './types';

export interface WebhookConfig {
  API_URL: string;
  MAX_ATTEMPTS: number;
  RETRY_MS: number;
}

export function registerWebhookRoutes(
  app: Application,
  config: WebhookConfig,
  openWaUrl: string | undefined,
  agentUrl: string | undefined
) {
  app.post('/webhook', async (req: express.Request, res: express.Response) => {
    let message: WhatsAppMessage | undefined;
    let from: string | undefined;

    try {
      if (req.body && req.body.data) {
        message = req.body.data as WhatsAppMessage;
        from = req.body.data.from;
      } else {
        throw new Error('Invalid webhook format');
      }
    } catch {}

    if (message) {
      const origen = from || message.chatId || 'desconocido';
      console.log(`📩 Mensaje recibido (${message.text}) de ${origen}`);
    }

    try {
      if (!message) return res.sendStatus(200);
      if (!openWaUrl) throw new Error('Service URLs not configured');
      const chatId = message.chatId || from;
      let conv: Conversation | undefined;
      if (chatId) {
        try {
          conv = await addMessageToConversation(chatId, message, openWaUrl);
        } catch (err: any) {
          console.warn('Failed updating conversation:', err.message);
        }
      }
      if (!conv) throw new Error('Conversation unavailable');
      const handler = getHandler(chatId, agentUrl);
      if (!handler) throw new Error('No handler configured');
      let reply: string;
      if (typeof handler === 'string') {
        const agentRes = await axios.post(handler, { conversation: conv });
        reply = agentRes.data.reply || agentRes.data;
      } else {
        reply = await handler(conv);
      }
      await axios.post(`${openWaUrl}/sendText`, { args: { to: from, content: reply } });
    } catch (err: any) {
      console.error('Error processing message', err.message);
    }

    res.sendStatus(200);
  });
}

export async function waitForGateway(config: WebhookConfig) {
  for (let i = 1; i <= config.MAX_ATTEMPTS; i++) {
    try {
      await axios.get(`${config.API_URL}/api-docs/`);
      console.log('🟢  nucleo-whatsapp ready');
      return;
    } catch (e) {
      console.warn(
        'Gateway not responding',
        `connecting to: ${config.API_URL}/api-docs/ (attempt ${i}/${config.MAX_ATTEMPTS})…`,
        e
      );
      await new Promise((r) => setTimeout(r, config.RETRY_MS));
    }
  }
  throw new Error('nucleo-whatsapp did not respond in time');
}

export async function clearWebhooks(config: WebhookConfig) {
  try {
    const { data } = await axios.post(`${config.API_URL}/listWebhooks`);
    const hooks = data?.response || [];
    if (!hooks.length) {
      console.log('No existing webhooks to remove');
      return;
    }

    console.log(`Removing ${hooks.length} webhooks…`);
    const results = await Promise.allSettled(
      hooks.map((h: any) => axios.post(`${config.API_URL}/removeWebhook`, { args: { webhookId: h.id } }))
    );

    results.forEach((r: PromiseSettledResult<any>, i: number) => {
      const id = hooks[i].id;
      if (r.status === 'fulfilled' && (r as PromiseFulfilledResult<any>).value?.data?.response === true) {
        console.log(`✔️  Removed webhook ${id}`);
      } else {
        console.warn(`⚠️  Failed to remove webhook ${id}`);
      }
    });

    const ok = results.filter(
      (r: PromiseSettledResult<any>) => r.status === 'fulfilled' && (r as PromiseFulfilledResult<any>).value?.data?.response === true
    ).length;
    console.log(`Cleanup OK (${ok}/${hooks.length} removed)`);
  } catch (e: any) {
    console.error('Failed cleaning webhooks:', e.response?.data || e.message);
  }
}

export async function registerWebhook(config: WebhookConfig, port: number) {
  const url = process.env.WEBHOOK_URL || `http://whatsapp-router:${port}/webhook`;
  const eventConfig = {
    onAck: false,
    onAddedToGroup: true,
    // use onAnyMessage to also receive messages sent by nucleo-whatsapp itself
    onAnyMessage: true,
    onBattery: true,
    onBroadcast: true,
    onButton: true,
    onCallState: false,
    onChatDeleted: true,
    onChatOpened: true,
    onChatState: true,
    onContactAdded: true,
    onGlobalParticipantsChanged: true,
    onGroupApprovalRequest: true,
    onGroupChange: true,
    onIncomingCall: false,
    onLabel: true,
    onLogout: true,
    // disable onMessage to avoid duplicates with onAnyMessage
    onMessage: false,
    onMessageDeleted: true,
    onNewProduct: true,
    onOrder: true,
    onPlugged: false,
    onPollVote: true,
    onReaction: true,
    onRemovedFromGroup: false,
    onStateChanged: false,
    onStory: false,
  } as const;

  const events = Object.entries(eventConfig)
    .filter(([_, enabled]) => enabled)
    .map(([event]) => event);

  const { data } = await axios.post(`${config.API_URL}/registerWebhook`, {
    args: { url, events },
  });

  console.log('✔️  Webhook registered:', data);
}