/**
 * Central chrome.runtime.onMessage handler for the background service worker.
 * Routes messages from content scripts and the dashboard to local handlers or
 * the native host. Handled actions:
 *   - send            Forward a typed payload to the native host (async).
 *   - registerSwarm   Track a swarm ID for a tab (local, not forwarded).
 *   - subscribe       Subscribe a tab to tunnel lifecycle events.
 *   - unsubscribe     Unsubscribe a tab from tunnel lifecycle events.
 *   - registerDashboard   Add a tab to the dashboard broadcast set.
 *   - unregisterDashboard Remove a tab from the dashboard broadcast set.
 *   - getState        Fetch full extension + native host state (async).
 * Depends on: state.js, logs.js, proxy.js (getActiveTlds, applyPAC, pacConfirmedActive),
 *             native-messaging.js (send, port, subscribedTabs, dashboardTabs)
 */

browser.runtime.onMessage.addListener((message, sender, sendResponse) => {
  let responded = false;
  function reply(value) {
    if (responded) return;
    responded = true;
    try { sendResponse(value); } catch (_) {}
  }

  if (message.target !== 'holesail-native') {
    reply({ error: 'Unknown target' });
    return false;
  }

  // Handle registerSwarm locally (legacy) - don't forward to native host
  if (message.action === 'send' && message.payload?.type === 'registerSwarm') {
    const swarmId = message.payload?.payload?.swarmId;
    if (swarmId && sender.tab?.id != null) {
      if (!tabSwarms.has(sender.tab.id)) {
        tabSwarms.set(sender.tab.id, new Set());
      }
      tabSwarms.get(sender.tab.id).add(swarmId);
      const count = swarmRefCount.get(swarmId) || 0;
      swarmRefCount.set(swarmId, count + 1);
      log('Registered swarm', swarmId, 'for tab', sender.tab.id, '- refcount:', count + 1);
    }
    reply({ ok: true });
    return false;
  }

  if (message.action === 'send') {
    send(message.payload)
      .then((r) => {
        // After setVirtualHost or removeVirtualHost, refresh virtualHosts and re-apply PAC
        if (r && r.ok && (
          message.payload?.type === 'setVirtualHost' ||
          message.payload?.type === 'removeVirtualHost'
        )) {
          send({ type: 'getState', payload: {} }).then((state) => {
            if (state && state.ok && Array.isArray(state.virtualHosts)) {
              extensionState.virtualHosts = state.virtualHosts;
              const newTlds = getActiveTlds(extensionState.virtualHosts);
              applyPAC(newTlds);
              if (message.payload?.type === 'setVirtualHost' && message.payload?.payload?.hostname) {
                const hostname = message.payload.payload.hostname;
                const parts = hostname.split('.');
                if (parts.length >= 3) {
                  const baseDomain = parts.slice(-2).join('.');
                  if (baseDomain !== 'hole.sail') {
                    const origin = '*://*.' + baseDomain + '/*';
                    browser.permissions.request({ origins: [origin] }, (granted) => {
                      log('permissions.request for', origin, ':', granted ? 'granted' : 'denied');
                    });
                  }
                }
              }
            }
          }).catch(() => {});
        }
        reply(r);
      })
      .catch((err) => reply({ error: err.message }));
    return true; // async response
  }

  if (message.action === 'subscribe' && sender.tab && sender.tab.id != null) {
    subscribedTabs.add(sender.tab.id);
    reply({ ok: true });
    return false;
  }
  if (message.action === 'unsubscribe' && sender.tab && sender.tab.id != null) {
    subscribedTabs.delete(sender.tab.id);
    reply({ ok: true });
    return false;
  }

  if (message.action === 'registerDashboard' && sender.tab && sender.tab.id != null) {
    dashboardTabs.add(sender.tab.id);
    log('Dashboard registered for tab', sender.tab.id);
    reply({ ok: true, logs: logs.slice(0) });
    return false;
  }

  if (message.action === 'unregisterDashboard' && sender.tab && sender.tab.id != null) {
    dashboardTabs.delete(sender.tab.id);
    reply({ ok: true });
    return false;
  }

  if (message.action === 'getState') {
    debugLog('getState action: port=', !!port);
    updateExtensionState();
    if (port) {
      send({ type: 'getState', payload: {} })
        .then((payload) => {
          debugLog('getState response: ok=', payload && payload.ok, 'servers=', payload && payload.servers && payload.servers.length, 'virtualHosts=', payload && payload.virtualHosts && payload.virtualHosts.length, 'proxyPort=', payload && payload.proxyPort, 'connectProxyPort=', payload && payload.connectProxyPort);
          if (payload && payload.ok === true && (payload.servers || payload.virtualHosts || payload.proxyPort != null || payload.connectProxyPort != null)) {
            extensionState.proxyPort = payload.proxyPort ?? null;
            extensionState.connectProxyPort = payload.connectProxyPort ?? null;
            extensionState.virtualHosts = payload.virtualHosts || [];
            if (payload.settings && typeof payload.settings.notifyOnDisconnect === 'boolean') {
              notifyOnDisconnect = payload.settings.notifyOnDisconnect;
            }
            if (payload.settings && typeof payload.settings.notifyOnTunnelError === 'boolean') {
              notifyOnTunnelError = payload.settings.notifyOnTunnelError;
            }
            if (!pacConfirmedActive) {
              log('getState: PAC not confirmed active, re-applying');
              applyPAC(getActiveTlds(extensionState.virtualHosts));
            }
            reply({
              ok: true,
              state: {
                hostConnected: true,
                servers: payload.servers || [],
                virtualHosts: payload.virtualHosts || [],
                serviceTunnels: payload.serviceTunnels || [],
                proxyPort: payload.proxyPort ?? null,
                connectProxyPort: payload.connectProxyPort ?? null,
                caInstalled: payload.caInstalled ?? false,
                settings: payload.settings || {},
                sshConnections: payload.sshConnections || [],
                rdpConnections: payload.rdpConnections || [],
                trafficStats: payload.trafficStats || null,
                stats: { ...extensionState.stats, ...payload.stats }
              }
            });
          } else {
            reply({
              ok: true,
              state: {
                hostConnected: true,
                servers: extensionState.servers || [],
                virtualHosts: extensionState.virtualHosts || [],
                serviceTunnels: [],
                sshConnections: [],
                rdpConnections: [],
                proxyPort: null,
                connectProxyPort: null,
                caInstalled: false,
                stats: extensionState.stats
              }
            });
          }
        })
        .catch((err) => {
          debugLog('getState send failed:', err && err.message);
          reply({
            ok: true,
            state: {
              hostConnected: extensionState.hostConnected,
              servers: extensionState.servers || [],
              virtualHosts: extensionState.virtualHosts || [],
              serviceTunnels: [],
              sshConnections: [],
              rdpConnections: [],
              proxyPort: null,
              connectProxyPort: null,
              caInstalled: false,
              stats: extensionState.stats
            }
          });
        });
    } else {
      debugLog('getState: no port, replying hostConnected=false');
      reply({
        ok: true,
        state: {
          hostConnected: false,
          servers: [],
          virtualHosts: [],
          serviceTunnels: [],
          sshConnections: [],
          rdpConnections: [],
          proxyPort: null,
          connectProxyPort: null,
          caInstalled: false,
          stats: extensionState.stats
        }
      });
    }
    return true;
  }

  reply({ error: 'Unknown action' });
  return false;
});