/* ObsiGate — Sync: SSE client + PWA registration */
import { state } from './state.js';
import { showToast } from './ui.js';
import { loadVaults, loadTags, refreshTagsForContext, refreshSidebarTreePreservingState } from './sidebar.js';
import { loadRecentFiles } from './config.js';
import { openFile } from './viewer.js';

// ---------------------------------------------------------------------------
// SSE Client — IndexUpdateManager
// ---------------------------------------------------------------------------
export const IndexUpdateManager = (() => {
  let eventSource = null;
  let reconnectTimer = null;
  let reconnectDelay = 1000;
  const MAX_RECONNECT_DELAY = 30000;
  let recentEvents = [];
  const MAX_RECENT_EVENTS = 20;
  let connectionState = "disconnected"; // disconnected | connecting | connected

  function connect() {
    if (eventSource) {
      eventSource.close();
    }
    connectionState = "connecting";
    _updateBadge();

    eventSource = new EventSource("/api/events");

    eventSource.addEventListener("connected", (e) => {
      connectionState = "connected";
      reconnectDelay = 1000;
      _updateBadge();
    });

    eventSource.addEventListener("index_updated", (e) => {
      try {
        const data = JSON.parse(e.data);
        _addEvent("index_updated", data);
        _onIndexUpdated(data);
      } catch (err) {
        console.error("SSE parse error:", err);
      }
    });

    eventSource.addEventListener("index_reloaded", (e) => {
      try {
        const data = JSON.parse(e.data);
        _addEvent("index_reloaded", data);
        _onIndexReloaded(data);
      } catch (err) {
        console.error("SSE parse error:", err);
      }
    });

    eventSource.addEventListener("vault_added", (e) => {
      try {
        const data = JSON.parse(e.data);
        _addEvent("vault_added", data);
        showToast(`Vault "${data.vault}" ajouté (${data.stats.file_count} fichiers)`, "info");
        loadVaults();
        loadTags();
      } catch (err) {
        console.error("SSE parse error:", err);
      }
    });

    eventSource.addEventListener("vault_removed", (e) => {
      try {
        const data = JSON.parse(e.data);
        _addEvent("vault_removed", data);
        showToast(`Vault "${data.vault}" supprimé`, "info");
        loadVaults();
        loadTags();
      } catch (err) {
        console.error("SSE parse error:", err);
      }
    });

    eventSource.addEventListener("index_start", (e) => {
      try {
        const data = JSON.parse(e.data);
        _addEvent("index_start", data);
        connectionState = "syncing";
        _updateBadge();
        showToast(`Indexation démarrée (${data.total_vaults} vaults)`, "info");
      } catch (err) {
        console.error("SSE parse error:", err);
      }
    });

    eventSource.addEventListener("index_progress", (e) => {
      try {
        const data = JSON.parse(e.data);
        _addEvent("index_progress", data);
        connectionState = "syncing";
        _updateBadge();
        loadVaults();
        loadTags();
      } catch (err) {
        console.error("SSE parse error:", err);
      }
    });

    eventSource.addEventListener("index_complete", (e) => {
      try {
        const data = JSON.parse(e.data);
        _addEvent("index_complete", data);
        connectionState = "connected";
        _updateBadge();
        showToast(`Indexation terminée (${data.total_files} fichiers)`, "success");
        loadVaults();
        loadTags();
      } catch (err) {
        console.error("SSE parse error:", err);
      }
    });

    eventSource.onerror = () => {
      connectionState = "disconnected";
      _updateBadge();
      eventSource.close();
      eventSource = null;
      _scheduleReconnect();
    };
  }

  function _scheduleReconnect() {
    if (reconnectTimer) clearTimeout(reconnectTimer);
    reconnectTimer = setTimeout(() => {
      reconnectDelay = Math.min(reconnectDelay * 2, MAX_RECONNECT_DELAY);
      connect();
    }, reconnectDelay);
  }

  function _addEvent(type, data) {
    recentEvents.unshift({
      type,
      data,
      timestamp: new Date().toISOString(),
    });
    if (recentEvents.length > MAX_RECENT_EVENTS) {
      recentEvents = recentEvents.slice(0, MAX_RECENT_EVENTS);
    }
  }

  async function _onIndexUpdated(data) {
    // Brief syncing state
    connectionState = "syncing";
    _updateBadge();

    const n = data.total_changes || 0;
    const vaults = (data.vaults || []).join(", ");
    // Toast removed: silent auto-indexing — no notification needed

    // Refresh sidebar and tags if affected vault matches current context
    const affectsCurrentVault = state.selectedContextVault === "all" || (data.vaults || []).includes(state.selectedContextVault);
    if (affectsCurrentVault) {
      try {
        await Promise.all([refreshSidebarTreePreservingState(), refreshTagsForContext()]);
        // Refresh current file if it was updated
        if (state.currentVault && state.currentPath) {
          const changed = (data.changes || []).some((c) => c.vault === state.currentVault && c.path === state.currentPath);
          if (changed) {
            openFile(state.currentVault, state.currentPath);
          }
        }
      } catch (err) {
        console.error("Error refreshing after index update:", err);
      }
    }

    // Refresh recent tab if it is active
    if (state.activeSidebarTab === "recent") {
      const vaultFilter = document.getElementById("recent-vault-filter");
      loadRecentFiles(vaultFilter ? vaultFilter.value || null : null);
    }

    setTimeout(() => {
      connectionState = "connected";
      _updateBadge();
    }, 1500);
  }

  async function _onIndexReloaded(data) {
    connectionState = "syncing";
    _updateBadge();
    showToast("Index complet rechargé", "info");
    try {
      await Promise.all([loadVaults(), loadTags()]);
    } catch (err) {
      console.error("Error refreshing after full reload:", err);
    }
    setTimeout(() => {
      connectionState = "connected";
      _updateBadge();
    }, 1500);
  }

  function _updateBadge() {
    const badge = document.getElementById("sync-badge");
    if (!badge) return;
    badge.className = "sync-badge sync-badge--" + connectionState;
    const labels = {
      disconnected: "Déconnecté",
      connecting: "Connexion...",
      connected: "Synchronisé",
      syncing: "Mise à jour...",
    };
    badge.title = labels[connectionState] || connectionState;
  }

  function disconnect() {
    if (eventSource) {
      eventSource.close();
      eventSource = null;
    }
    if (reconnectTimer) {
      clearTimeout(reconnectTimer);
      reconnectTimer = null;
    }
    connectionState = "disconnected";
    _updateBadge();
  }

  function getState() {
    return connectionState;
  }

  function getRecentEvents() {
    return recentEvents;
  }

  return { connect, disconnect, getState, getRecentEvents };
})();

// ---------------------------------------------------------------------------
// Sync status badge and panel
// ---------------------------------------------------------------------------

function initSyncStatus() {
  const badge = document.getElementById("sync-badge");
  if (!badge) return;

  badge.addEventListener("click", (e) => {
    e.stopPropagation();
    toggleSyncPanel();
  });

  IndexUpdateManager.connect();

  // Initialize AI status tracking
  _initAIStatus();
}

function toggleSyncPanel() {
  let panel = document.getElementById("sync-panel");
  if (panel) {
    panel.remove();
    return;
  }
  // Auto reconnect if disconnected when user opens the panel
  if (IndexUpdateManager.getState() === "disconnected") {
    IndexUpdateManager.connect();
  }
  panel = document.createElement("div");
  panel.id = "sync-panel";
  panel.className = "sync-panel";
  _renderSyncPanel(panel);
  document.body.appendChild(panel);

  // Close on outside click
  setTimeout(() => {
    document.addEventListener("click", _closeSyncPanelOutside, { once: true });
  }, 0);
}

function _closeSyncPanelOutside(e) {
  const panel = document.getElementById("sync-panel");
  if (panel && !panel.contains(e.target) && e.target.id !== "sync-badge") {
    panel.remove();
  }
}

function _renderSyncPanel(panel) {
  const state = IndexUpdateManager.getState();
  const events = IndexUpdateManager.getRecentEvents();

  const stateLabels = {
    disconnected: "Déconnecté",
    connecting: "Connexion...",
    connected: "Connecté",
    syncing: "Synchronisation...",
  };

  let html = `<div class="sync-panel__header">
    <span class="sync-panel__title">Synchronisation</span>
    <span class="sync-panel__state sync-panel__state--${state}">${stateLabels[state] || state}</span>
  </div>`;

  if (events.length === 0) {
    html += `<div class="sync-panel__empty">Aucun événement récent</div>`;
  } else {
    html += `<div class="sync-panel__events">`;
    events.slice(0, 10).forEach((ev) => {
      const time = new Date(ev.timestamp).toLocaleTimeString();
      const typeLabels = {
        index_updated: "Mise à jour",
        index_reloaded: "Rechargement",
        vault_added: "Vault ajouté",
        vault_removed: "Vault supprimé",
        index_start: "Démarrage index.",
        index_progress: "Vault indexé",
        index_complete: "Indexation tech.",
      };
      const label = typeLabels[ev.type] || ev.type;
      let detail = ev.data.vaults ? ev.data.vaults.join(", ") : ev.data.vault || "";
      if (ev.type === "index_start") detail = `${ev.data.total_vaults} vaults à traiter`;
      if (ev.type === "index_progress") detail = `${ev.data.vault} (${ev.data.files} fichiers)`;
      if (ev.type === "index_complete" && ev.data.total_files !== undefined) detail = `${ev.data.total_files} fichiers total`;
      html += `<div class="sync-panel__event">
        <span class="sync-panel__event-type">${label}</span>
        <span class="sync-panel__event-detail">${detail}</span>
        <span class="sync-panel__event-time">${time}</span>
      </div>`;
    });
    html += `</div>`;
  }

  panel.innerHTML = html;

  // ── AI Status section ──
  _renderAIStatusSection(panel);
}

// ---------------------------------------------------------------------------
// AI Status Indicator (inside sync panel + header badge animation)
// ---------------------------------------------------------------------------

let _aiProcessing = false;
let _aiStatusChecked = false;
let _aiConfigured = null; // null = unknown, true/false

/** Check if AI is configured by calling the status endpoint. */
async function _checkAIStatus() {
  if (_aiStatusChecked) return;
  try {
    const resp = await api('/api/ai/status');
    _aiConfigured = !!(resp && resp.configured);
  } catch (e) {
    _aiConfigured = false;
  }
  _aiStatusChecked = true;
}

function _renderAIStatusSection(panel) {
  const section = document.createElement('div');
  section.className = 'sync-panel__ai-section';
  section.id = 'sync-panel-ai';

  let statusIcon, statusText, statusClass;
  if (_aiProcessing) {
    statusIcon = 'loader';
    statusText = 'Traitement en cours…';
    statusClass = 'sync-panel__ai--processing';
  } else if (_aiConfigured === true) {
    statusIcon = 'check-circle';
    statusText = 'IA configurée et active';
    statusClass = 'sync-panel__ai--active';
  } else if (_aiConfigured === false) {
    statusIcon = 'x-circle';
    statusText = 'IA non configurée';
    statusClass = 'sync-panel__ai--inactive';
  } else {
    statusIcon = 'help-circle';
    statusText = 'Statut IA inconnu';
    statusClass = 'sync-panel__ai--unknown';
  }

  section.innerHTML = `
    <div class="sync-panel__ai-header">
      <span class="sync-panel__ai-title">Intelligence Artificielle</span>
      <span class="sync-panel__ai-state ${statusClass}" data-lucide-icon="${statusIcon}">
        <i data-lucide="${statusIcon}" style="width:14px;height:14px"></i>
        ${statusText}
      </span>
    </div>
  `;

  panel.appendChild(section);
  // Trigger icon refresh via global
  if (window._obsigateRefreshIcons) window._obsigateRefreshIcons();
}

/** Update the AI section in the open sync panel. */
function _updateAIStatusInPanel() {
  const section = document.getElementById('sync-panel-ai');
  if (!section) return;
  section.innerHTML = '';
  const panel = document.getElementById('sync-panel');
  if (panel) {
    // Re-render just the AI section
    const oldSection = panel.querySelector('.sync-panel__ai-section');
    if (oldSection) oldSection.remove();
    _renderAIStatusSection(panel);
  }
}

/** Flash the sync badge white during AI processing. */
function _setBadgeAIProcessing(active) {
  const badge = document.getElementById('sync-badge');
  if (!badge) return;
  if (active) {
    badge.classList.add('sync-badge--ai-processing');
  } else {
    badge.classList.remove('sync-badge--ai-processing');
  }
}

/** Initialize AI status tracking. */
function _initAIStatus() {
  // Listen for AI processing events from ai.js
  document.addEventListener('ai-processing-start', () => {
    _aiProcessing = true;
    _setBadgeAIProcessing(true);
    _updateAIStatusInPanel();
  });

  document.addEventListener('ai-processing-end', () => {
    _aiProcessing = false;
    _setBadgeAIProcessing(false);
    _updateAIStatusInPanel();
  });

  // Check AI status on first sync panel open
  const badge = document.getElementById('sync-badge');
  if (badge) {
    const origClick = badge.onclick;
    badge.addEventListener('click', () => {
      _checkAIStatus().then(() => _updateAIStatusInPanel());
    }, { once: false });
  }
}

// ---------------------------------------------------------------------------
// PWA Service Worker Registration
// ---------------------------------------------------------------------------
function registerServiceWorker() {
  if ("serviceWorker" in navigator) {
    window.addEventListener("load", () => {
      navigator.serviceWorker
        .register("/sw.js")
        .then((registration) => {
          console.log("[PWA] Service Worker registered successfully:", registration.scope);

          // Check for updates periodically
          setInterval(() => {
            registration.update();
          }, 60000); // Check every minute

          // Handle service worker updates
          registration.addEventListener("updatefound", () => {
            const newWorker = registration.installing;
            newWorker.addEventListener("statechange", () => {
              if (newWorker.state === "installed" && navigator.serviceWorker.controller) {
                // New service worker available
                showUpdateNotification();
              }
            });
          });
        })
        .catch((error) => {
          console.log("[PWA] Service Worker registration failed:", error);
        });
    });
  }
}

function showUpdateNotification() {
  const message = document.createElement("div");
  message.className = "pwa-update-notification";
  message.innerHTML = `
    <div class="pwa-update-content">
      <span>Une nouvelle version d'ObsiGate est disponible !</span>
      <button class="pwa-update-btn" onclick="window.location.reload()">Mettre à jour</button>
      <button class="pwa-update-dismiss" onclick="this.parentElement.parentElement.remove()">×</button>
    </div>
  `;
  document.body.appendChild(message);

  // Auto-dismiss after 30 seconds
  setTimeout(() => {
    if (message.parentElement) {
      message.remove();
    }
  }, 30000);
}

// Handle install prompt
let deferredPrompt;
window.addEventListener("beforeinstallprompt", (e) => {
  e.preventDefault();
  deferredPrompt = e;

  // Show install button if desired
  const installBtn = document.getElementById("pwa-install-btn");
  if (installBtn) {
    installBtn.style.display = "block";
    installBtn.addEventListener("click", async () => {
      if (deferredPrompt) {
        deferredPrompt.prompt();
        const { outcome } = await deferredPrompt.userChoice;
        console.log(`[PWA] User response to install prompt: ${outcome}`);
        deferredPrompt = null;
        installBtn.style.display = "none";
      }
    });
  }
});

// Log when app is installed
window.addEventListener("appinstalled", () => {
  console.log("[PWA] ObsiGate has been installed");
  showToast("ObsiGate installé avec succès !", "success");
});

// ── Dashboard tab switching (runs on page load and after rebuild) ──
function initDashboardTabs() {
  document.querySelectorAll(".dashboard-tab").forEach(tab => {
    // Remove existing listeners by cloning
    const newTab = tab.cloneNode(true);
    tab.parentNode.replaceChild(newTab, tab);
    newTab.addEventListener("click", function() {
      document.querySelectorAll(".dashboard-tab").forEach(t => t.classList.remove("active"));
      document.querySelectorAll(".dashboard-panel").forEach(p => p.classList.remove("active"));
      this.classList.add("active");
      const panel = document.getElementById("dashboard-panel-" + this.dataset.tab);
      if (panel) panel.classList.add("active");
    });
  });
}

// ---------------------------------------------------------------------------
// Init — called by app.js orchestrator
// ---------------------------------------------------------------------------
export { initSyncStatus, initDashboardTabs };
export function init() {
  registerServiceWorker();
  initDashboardTabs();
}