const express = require('express');
const router = express.Router();
const { query } = require('../config/db');
const channelsSvc = require('../services/channels');
const generationQueue = require('../workers/generation');

// POST /api/generate — создать задачу генерации
router.post('/', async (req, res) => {
  try {
    const { type, topic, channelId, rubric, keywords = [], useCritique = true } = req.body;
    const userId = req.headers['x-user-id'] || null;

    if (!type) return res.status(400).json({ error: 'type is required' });
    if (!['post', 'article', 'topics'].includes(type)) return res.status(400).json({ error: 'Invalid type' });
    if (type !== 'topics' && !topic) return res.status(400).json({ error: 'topic is required' });
    if (type === 'post' && !channelId) return res.status(400).json({ error: 'channelId is required for posts' });

    const { rows } = await query(
      `INSERT INTO generation_jobs (user_id, channel_id, type, topic, rubric, status)
       VALUES ($1,$2,$3,$4,$5,'pending') RETURNING id`,
      [userId, channelId || null, type, topic || null, rubric || null]
    );
    const jobId = rows[0].id;

    await generationQueue.add({ jobId, type, topic, channelId, rubric, keywords, useCritique });

    res.json({ jobId, status: 'pending' });
  } catch (err) {
    console.error('[Route] POST /generate', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/generate/:id — статус и результат
router.get('/:id', async (req, res) => {
  try {
    const { rows } = await query(`SELECT * FROM generation_jobs WHERE id=$1`, [req.params.id]);
    if (!rows.length) return res.status(404).json({ error: 'Job not found' });
    res.json(rows[0]);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// POST /api/generate/transform — синхронная трансформация поста (короче/длиннее/улучшить)
router.post('/transform', async (req, res) => {
  try {
    const { channelId, originalPost, action } = req.body;
    const userId = parseInt(req.headers['x-user-id']) || null;
    if (!channelId || !originalPost || !action) {
      return res.status(400).json({ error: 'channelId, originalPost, action required' });
    }
    const channel = await channelsSvc.getChannel(userId, channelId);
    if (!channel) return res.status(404).json({ error: 'Channel not found' });

    const ai = require('../services/ai');
    const result = await ai.transformPost(channel, { originalPost, action });
    res.json(result);
  } catch (err) {
    console.error('[Route] POST /transform', err);
    res.status(500).json({ error: err.message });
  }
});

// POST /api/generate/post-image — синхронная генерация картинки к посту
router.post('/post-image', async (req, res) => {
  try {
    const { channelId, post } = req.body;
    const userId = parseInt(req.headers['x-user-id']) || null;
    if (!channelId || !post) return res.status(400).json({ error: 'channelId and post required' });

    const channel = await channelsSvc.getChannel(userId, channelId);
    if (!channel) return res.status(404).json({ error: 'Channel not found' });

    const { generatePostImage } = require('../services/postImages');
    const result = await generatePostImage({ post, channel, style: channel.style || {} });
    res.json(result);
  } catch (err) {
    console.error('[Route] POST /post-image', err);
    res.status(500).json({ error: err.message });
  }
});

// GET /api/generate/image-styles — список доступных стилей картинок
router.get('/image-styles', async (_, res) => {
  const { IMAGE_STYLES, IMAGE_PALETTES } = require('../services/postImages');
  res.json({
    styles: Object.entries(IMAGE_STYLES).map(([v, s]) => ({ value: v, label: s.label })),
    palettes: Object.keys(IMAGE_PALETTES).map(v => ({
      value: v,
      label: { auto: 'Авто', dark: 'Тёмная', light: 'Светлая', warm: 'Тёплая', cool: 'Холодная', mono: 'Монохром', vibrant: 'Яркая' }[v] || v
    })),
  });
});

// POST /api/generate/topics-ideas — синхронные идеи тем для канала
router.post('/topics-ideas', async (req, res) => {
  try {
    const { channelId, count = 7 } = req.body;
    const userId = parseInt(req.headers['x-user-id']) || null;
    if (!channelId) return res.status(400).json({ error: 'channelId required' });
    const channel = await channelsSvc.getChannel(userId, channelId);
    if (!channel) return res.status(404).json({ error: 'Channel not found' });

    const ai = require('../services/ai');
    const result = await ai.generateTopics(channel, count);
    res.json(result);
  } catch (err) {
    console.error('[Route] POST /topics-ideas', err);
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;