const express = require('express');
const router = express.Router();
const channelsSvc = require('../services/channels');
const settings = require('../services/settings');
const autoPublish = require('../services/articleAutoPublish');
const { query } = require('../config/db');

const getUserId = (req) => {
  const id = req.headers['x-user-id'];
  if (!id) return null;
  return parseInt(id);
};

// ── Admin routes (системные каналы zeropost, без user_id) ─────────────────────

// GET /api/channels/admin — список системных каналов
router.get('/admin', async (req, res) => {
  try {
    const { rows } = await query(
      `SELECT c.*,
         to_jsonb(s.*) - 'channel_id' - 'updated_at' AS style,
         to_jsonb(sch.*) - 'channel_id' - 'updated_at' AS schedule
       FROM channels c
       LEFT JOIN channel_style s ON s.channel_id = c.id
       LEFT JOIN channel_schedule sch ON sch.channel_id = c.id
       WHERE c.is_system = true
       ORDER BY c.created_at ASC`
    );
    res.json(rows);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// POST /api/channels/admin — создать системный канал
router.post('/admin', async (req, res) => {
  try {
    const {
      name, platform = 'telegram',
      tg_channel_id, tg_username, bot_token,
      vk_group_id, vk_access_token,
      max_channel_id, max_access_token,
      niche, audience, goal = 'educational',
    } = req.body;
    if (!name) return res.status(400).json({ error: 'name is required' });
    const { rows } = await query(
      `INSERT INTO channels
         (user_id, name, platform, tg_channel_id, tg_username, bot_token,
          vk_group_id, vk_access_token, max_channel_id, max_access_token,
          niche, audience, goal, is_system)
       VALUES (0,$1,$2,$3,$4,$5,$6,$7,$8,$9,$10,$11,$12,true)
       RETURNING *`,
      [name, platform, tg_channel_id||null, tg_username||null, bot_token||null,
       vk_group_id||null, vk_access_token||null, max_channel_id||null, max_access_token||null,
       niche||null, audience||null, goal]
    );
    await query(`INSERT INTO channel_style (channel_id) VALUES ($1) ON CONFLICT DO NOTHING`, [rows[0].id]);
    await query(`INSERT INTO channel_schedule (channel_id) VALUES ($1) ON CONFLICT DO NOTHING`, [rows[0].id]);
    res.json(rows[0]);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// PATCH /api/channels/admin/:id — обновить системный канал
router.patch('/admin/:id', async (req, res) => {
  try {
    const allowed = [
      'name','platform','tg_channel_id','tg_username','bot_token',
      'vk_group_id','vk_access_token','max_channel_id','max_access_token',
      'niche','audience','goal','is_active',
      // autopublish
      'auto_publish_enabled','auto_publish_categories','auto_publish_delay_min',
      'auto_publish_template','auto_publish_with_cover','auto_publish_button_text','auto_publish_image_source',
    ];
    const fields = []; const vals = []; let i = 1;
    for (const key of allowed) {
      if (req.body[key] !== undefined) {
        fields.push(`${key}=$${i++}`);
        vals.push(req.body[key]);
      }
    }
    if (!fields.length) return res.status(400).json({ error: 'Nothing to update' });
    fields.push(`updated_at=NOW()`);
    vals.push(req.params.id);
    const { rows } = await query(
      `UPDATE channels SET ${fields.join(',')} WHERE id=$${i} AND is_system=true RETURNING *`,
      vals
    );
    if (!rows.length) return res.status(404).json({ error: 'Not found' });
    res.json(rows[0]);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// DELETE /api/channels/admin/:id
router.delete('/admin/:id', async (req, res) => {
  try {
    await query(`DELETE FROM channels WHERE id=$1 AND is_system=true`, [req.params.id]);
    res.json({ ok: true });
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// POST /api/channels/admin/:id/publish — опубликовать статью в канал ПРЯМО СЕЙЧАС
// Использует channel.auto_publish_template (если есть) и channel.auto_publish_with_cover.
router.post('/admin/:id/publish', async (req, res) => {
  try {
    const { article_id, custom_text, with_cover } = req.body;
    const { rows } = await query(`SELECT * FROM channels WHERE id=$1 AND is_system=true`, [req.params.id]);
    if (!rows.length) return res.status(404).json({ error: 'Channel not found' });
    const channel = rows[0];

    // Создаём временный scheduled_post на NOW и сразу запускаем runner на него.
    const { rows: spRows } = await query(
      `INSERT INTO scheduled_posts (channel_id, article_id, custom_text, scheduled_at, status)
       VALUES ($1,$2,$3,NOW(),'pending') RETURNING *`,
      [channel.id, article_id || null, custom_text || null]
    );
    const sp = spRows[0];

    // Точечный запуск
    const runner = require('../services/scheduledPostsRunner');
    try {
      const { messageId } = await runner.publishOne(sp);
      await query(
        `UPDATE scheduled_posts SET status='sent', published_at=NOW(), error=NULL WHERE id=$1`,
        [sp.id]
      );
      return res.json({ ok: true, platform: channel.platform, tg_message_id: messageId || null, scheduled_post_id: sp.id });
    } catch (err) {
      const msg = err.response?.data?.description || err.response?.data?.error?.error_msg || err.message;
      await query(
        `UPDATE scheduled_posts SET status='failed', error=$1 WHERE id=$2`,
        [String(msg).slice(0, 1000), sp.id]
      );
      return res.status(500).json({ error: msg });
    }
  } catch (err) {
    const msg = err.response?.data?.description || err.message;
    res.status(500).json({ error: msg });
  }
});

// GET /api/channels/admin/:id/posts — история публикаций канала
router.get('/admin/:id/posts', async (req, res) => {
  try {
    const { rows } = await query(
      `SELECT * FROM posts WHERE channel_id=$1 ORDER BY created_at DESC LIMIT 50`,
      [req.params.id]
    );
    res.json(rows);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// ── Publish slots ─────────────────────────────────────────────────────────────

// GET /api/channels/admin/:id/slots
router.get('/admin/:id/slots', async (req, res) => {
  try {
    const { rows } = await query(
      `SELECT * FROM publish_slots WHERE channel_id=$1 ORDER BY sort_order, slot_hour, slot_minute`,
      [req.params.id]
    );
    res.json(rows);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// POST /api/channels/admin/:id/slots
router.post('/admin/:id/slots', async (req, res) => {
  try {
    const { slot_hour, slot_minute, label, enabled = true } = req.body;
    const { rows: existing } = await query(
      `SELECT COUNT(*) as cnt FROM publish_slots WHERE channel_id=$1`, [req.params.id]
    );
    const sort_order = parseInt(existing[0].cnt);
    const { rows } = await query(
      `INSERT INTO publish_slots (channel_id, slot_hour, slot_minute, label, enabled, sort_order)
       VALUES ($1,$2,$3,$4,$5,$6)
       ON CONFLICT (channel_id, slot_hour, slot_minute) DO UPDATE
       SET label=$4, enabled=$5 RETURNING *`,
      [req.params.id, slot_hour, slot_minute, label || null, enabled, sort_order]
    );
    res.json(rows[0]);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// DELETE /api/channels/admin/:id/slots/:slotId
router.delete('/admin/:id/slots/:slotId', async (req, res) => {
  try {
    await query(`DELETE FROM publish_slots WHERE id=$1 AND channel_id=$2`,
      [req.params.slotId, req.params.id]);
    res.json({ ok: true });
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// GET /api/channels/admin/:id/scheduled — запланированные посты канала (pending+failed+sent последние)
router.get('/admin/:id/scheduled', async (req, res) => {
  try {
    const { rows } = await query(
      `SELECT sp.*, a.title as article_title, a.slug as article_slug, a.category as article_category
       FROM scheduled_posts sp
       LEFT JOIN articles a ON a.id = sp.article_id
       WHERE sp.channel_id=$1
       ORDER BY sp.scheduled_at DESC LIMIT 30`,
      [req.params.id]
    );
    res.json(rows);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// POST /api/channels/admin/:id/schedule — поставить пост в очередь
// scheduled_at: если не передан — берём ближайший слот канала (через autoPublish.pickScheduleTime).
router.post('/admin/:id/schedule', async (req, res) => {
  try {
    const { article_id, custom_text, scheduled_at } = req.body;
    const { rows: chs } = await query(`SELECT * FROM channels WHERE id=$1 AND is_system=true`, [req.params.id]);
    if (!chs.length) return res.status(404).json({ error: 'Channel not found' });

    const when = scheduled_at ? new Date(scheduled_at) : await autoPublish.pickScheduleTime(chs[0]);
    const { rows } = await query(
      `INSERT INTO scheduled_posts (channel_id, article_id, custom_text, scheduled_at)
       VALUES ($1,$2,$3,$4) RETURNING *`,
      [req.params.id, article_id || null, custom_text || null, when]
    );
    res.json(rows[0]);
  } catch (err) { res.status(500).json({ error: err.message }); }
});

// ── User routes (НЕ системные, для tool) ──────────────────────────────────────

router.get('/', async (req, res) => {
  const userId = getUserId(req);
  if (!userId) return res.status(401).json({ error: 'x-user-id required' });
  try {
    const channels = await channelsSvc.listChannels(userId);
    res.json(channels);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.get('/:id', async (req, res) => {
  const userId = getUserId(req);
  if (!userId) return res.status(401).json({ error: 'x-user-id required' });
  try {
    const channel = await channelsSvc.getFullChannel(req.params.id, userId);
    if (!channel) return res.status(404).json({ error: 'Channel not found' });
    res.json(channel);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.post('/', async (req, res) => {
  const userId = getUserId(req);
  if (!userId) return res.status(401).json({ error: 'x-user-id required' });
  try {
    // Проверяем лимит каналов по тарифу
    const billing = require('../services/billing');
    const bal = await billing.getBalance(userId);
    if (bal.channelsMax !== -1) {
      const { rows: [{ cnt }] } = await require('../config/db').query(
        'SELECT count(*)::int as cnt FROM channels WHERE user_id=$1 AND is_active=true', [userId]
      );
      if (cnt >= bal.channelsMax) {
        return res.status(402).json({
          error: `Лимит каналов по тарифу ${bal.planName}: максимум ${bal.channelsMax}. Перейдите на следующий тариф.`,
          code: 'CHANNEL_LIMIT_REACHED',
          current: cnt,
          max: bal.channelsMax,
          plan: bal.plan,
        });
      }
    }
    const channel = await channelsSvc.createChannel(userId, req.body);
    res.json(channel);
  } catch (err) {
    console.error('[Route] POST /channels', err);
    res.status(500).json({ error: err.message });
  }
});

router.patch('/:id', async (req, res) => {
  const userId = getUserId(req);
  if (!userId) return res.status(401).json({ error: 'x-user-id required' });
  try {
    const channel = await channelsSvc.updateChannel(req.params.id, userId, req.body);
    res.json(channel);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

router.delete('/:id', async (req, res) => {
  const userId = getUserId(req);
  if (!userId) return res.status(401).json({ error: 'x-user-id required' });
  try {
    await channelsSvc.deleteChannel(req.params.id, userId);
    res.json({ ok: true });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;