const api = require('./api');

let polling = false;
const pollIntervalMs = Number(process.env.TWITCH_POLL_INTERVAL_MS || 5000); // 5s default

// Keep track of which streams we've already announced per guild:user -> { started_at }
const announced = new Map(); // key: `${guildId}:${user}` -> { started_at }

async function checkGuild(client, guild) {
  try {
    // Intentionally quiet: per-guild checking logs are suppressed to avoid spam
    const settings = await api.getServerSettings(guild.id) || {};
    const liveSettings = settings.liveNotifications || {};
    if (!liveSettings.enabled) return;
    const channelId = liveSettings.channelId;
    const users = (liveSettings.users || []).map(u => u.toLowerCase()).filter(Boolean);
    if (!channelId || users.length === 0) return;
    // ask backend for current live streams
    const query = users.join(',');
    const streams = await api._rawGetTwitchStreams ? api._rawGetTwitchStreams(query) : null;
    // If the helper isn't available, try backend proxy
    let live = [];
    if (streams) live = streams.filter(s => s.is_live);
    else {
      try {
        const resp = await api.tryFetchTwitchStreams(query);
        live = (resp || []).filter(s => s.is_live);
      } catch (e) {
        live = [];
      }
    }
    if (!live || live.length === 0) {
      // No live streams: ensure any announced keys for these users are cleared so they can be re-announced later
      for (const u of users) {
        const key = `${guild.id}:${u}`;
        if (announced.has(key)) {
          announced.delete(key);
        }
      }
      return;
    }


    // fetch channel using client to ensure we can reach it
    let channel = null;
    try {
      channel = await client.channels.fetch(channelId);
    } catch (e) {
      console.error(`TwitchWatcher: failed to fetch channel ${channelId}:`, e && e.message ? e.message : e);
      channel = null;
    }
    if (!channel) {
      // Channel not found or inaccessible; skip
      return;
    }

    // Build a map of live logins for quick lookup
    const liveLogins = new Set(live.map(s => (s.user_login || '').toLowerCase()));

    // Clear announced entries for users that are no longer live
    for (const u of users) {
      const key = `${guild.id}:${u}`;
      if (!liveLogins.has(u) && announced.has(key)) {
        announced.delete(key);
      }
    }

    // Announce each live once per live session
    for (const s of live) {
      const login = (s.user_login || '').toLowerCase();
      const key = `${guild.id}:${login}`;
      if (announced.has(key)) continue; // already announced for this live session
      // mark announced for this session
      announced.set(key, { started_at: s.started_at || new Date().toISOString() });

      // Build and send embed
      try {
        // Announce without per-guild log spam
        const { EmbedBuilder } = require('discord.js');
        const embed = new EmbedBuilder()
          .setColor(0x9146FF)
          .setTitle(s.title || `${s.user_name} is live`)
          .setURL(s.url)
          .setAuthor({ name: s.user_name, iconURL: s.profile_image_url || undefined, url: s.url })
          .setThumbnail(s.thumbnail_url || s.profile_image_url || undefined)
          .addFields(
            { name: 'Category', value: s.game_name || 'Unknown', inline: true },
            { name: 'Viewers', value: String(s.viewer_count || 0), inline: true }
          )
          .setDescription(s.description || '')
          .setFooter({ text: `ehchadservices • Started: ${s.started_at ? new Date(s.started_at).toLocaleString() : 'unknown'}` });

        await channel.send({ embeds: [embed] });
        console.log(`🔔 Announced live: ${login} - ${(s.title || '').slice(0, 80)}`);
      } catch (e) {
        console.error(`TwitchWatcher: failed to send announcement for ${login}:`, e && e.message ? e.message : e);
        // fallback
        const msg = `🔴 ${s.user_name} is live: **${s.title}**\nWatch: ${s.url}`;
        try { await channel.send({ content: msg }); console.log('TwitchWatcher: fallback message sent'); } catch (err) { console.error('TwitchWatcher: fallback send failed:', err && err.message ? err.message : err); }
      }
    }
  } catch (e) {
    console.error('Error checking guild for live streams:', e && e.message ? e.message : e);
  }
}

async function poll(client) {
  if (polling) return;
  polling = true;
  console.log(`🔁 TwitchWatcher started, polling every ${Math.round(pollIntervalMs/1000)}s`);
  while (polling) {
    try {
      const guilds = Array.from(client.guilds.cache.values());
      for (const g of guilds) {
        await checkGuild(client, g).catch(err => { console.error('TwitchWatcher: checkGuild error', err && err.message ? err.message : err); });
      }
    } catch (e) {
      console.error('Error during twitch poll loop:', e && e.message ? e.message : e);
    }
    await new Promise(r => setTimeout(r, pollIntervalMs));
  }
}

function stop() { polling = false; }

module.exports = { poll, stop };