// Copyright (c) 2026 Gordon Bolton. MIT License.

import { state, SSE_RECONNECT_MS } from './state.js';
import { renderDownloads } from './ui/downloads.js';
import { hideError, hideLoading } from './ui/auth.js';
import { loadHistory } from './ui/history.js';

export function startSSE() {
  stopSSE();
  const params = state.showAll ? '?showAll=true' : '';
  const source = new EventSource('/api/dashboard/stream' + params);
  state.sseSource = source;

  let firstMessage = true;
  source.onmessage = (event) => {
    try {
      const data = JSON.parse(event.data);
      state.currentUser = data.user;
      state.isAdmin = !!data.isAdmin;
      state.downloads = data.downloads;
      // Store download clients and update filter dropdown
      if (data.downloadClients) {
        state.downloadClients = data.downloadClients;
        // Trigger filter update
        const filterUpdateEvent = new CustomEvent('downloadClientsUpdated');
        document.dispatchEvent(filterUpdateEvent);
      }
      // Store Ombi requests and base URL
      if (data.ombiRequests) {
        state.ombiRequests = data.ombiRequests;
        // Trigger requests update event
        const requestsUpdateEvent = new CustomEvent('ombiRequestsUpdated');
        document.dispatchEvent(requestsUpdateEvent);
      }
      if (data.ombiBaseUrl) {
        state.ombiBaseUrl = data.ombiBaseUrl;
      }
      document.getElementById('currentUser').textContent = state.currentUser || '-';
      renderDownloads();
      hideError();
      if (firstMessage) { firstMessage = false; hideLoading(); }
    } catch (err) {
      console.error('[SSE] Failed to parse message:', err);
    }
  };

  // Listen for history-update events from server
  source.addEventListener('history-update', (event) => {
    try {
      const data = JSON.parse(event.data);
      console.log('[SSE] History update received:', data.type);
      // Trigger history reload
      const historyReloadEvent = new CustomEvent('historyReload');
      document.dispatchEvent(historyReloadEvent);
    } catch (err) {
      console.error('[SSE] Failed to parse history-update message:', err);
    }
  });

  source.onerror = () => {
    // EventSource retries automatically; we just log and show a reconnecting indicator
    console.warn('[SSE] Connection lost, browser will retry...');
  };

  console.log('[SSE] Stream connected');
}

export function stopSSE() {
  if (state.sseReconnectTimer) { clearTimeout(state.sseReconnectTimer); state.sseReconnectTimer = null; }
  if (state.sseSource) {
    state.sseSource.close();
    state.sseSource = null;
    console.log('[SSE] Stream closed');
  }
}

export function handleShowAllToggle(checked) {
  state.showAll = checked;
  // Re-open stream with updated showAll param
  startSSE();
  // Trigger history reload with updated showAll param
  const historyReloadEvent = new CustomEvent('historyReload');
  document.dispatchEvent(historyReloadEvent);
}