const express = require('express');
const { v4: uuidv4 } = require('uuid');
const { generateImage } = require('../lib/generate-image');

function createNoteRoutes(db) {
  const router = express.Router();

  function createPublishTask(note) {
    // 已成功发布过的笔记不再创建新任务（防止重复发布）
    const completed = db.prepare(
      "SELECT id FROM publish_tasks WHERE note_id = ? AND status = 'completed'"
    ).get(note.id);
    if (completed) return;
    const existing = db.prepare(
      "SELECT id FROM publish_tasks WHERE note_id = ? AND status IN ('pending', 'claimed', 'executing')"
    ).get(note.id);
    if (existing) return;
    db.prepare(
      'INSERT INTO publish_tasks (id, note_id, shop_id) VALUES (?, ?, ?)'
    ).run(uuidv4(), note.id, note.shop_id);
  }

  router.get('/next', (req, res) => {
    const { shop_id } = req.query;
    if (!shop_id) return res.status(400).json({ error: 'shop_id is required' });
    const note = db.prepare(
      "SELECT n.*, p.title AS product_title, s.shop_name FROM notes n LEFT JOIN products p ON p.id = n.product_id LEFT JOIN shops s ON s.id = n.shop_id WHERE n.shop_id = ? AND n.status = 'approved' ORDER BY n.created_at ASC LIMIT 1"
    ).get(shop_id);
    if (!note) return res.status(404).json({ error: 'No pending notes' });
    res.json({
      ...note,
      topics: JSON.parse(note.topics || '[]'),
      image_paths: JSON.parse(note.image_paths || '[]'),
    });
  });

  router.get('/next/task', (req, res) => {
    req.url = '/next' + (req.url.includes('?') ? req.url.slice(req.url.indexOf('?')) : '');
    return router.handle(req, res);
  });

  router.get('/', (req, res) => {
    const { shop_id, status, product_id } = req.query;
    let sql = 'SELECT n.*, p.title as product_title FROM notes n LEFT JOIN products p ON p.id = n.product_id WHERE 1=1';
    const params = [];
    if (shop_id) { sql += ' AND n.shop_id = ?'; params.push(shop_id); }
    if (status) { sql += ' AND n.status = ?'; params.push(status); }
    if (product_id) { sql += ' AND n.product_id = ?'; params.push(product_id); }
    sql += ' ORDER BY n.created_at DESC';
    const notes = db.prepare(sql).all(...params);
    const parsed = notes.map(n => ({
      ...n,
      topics: JSON.parse(n.topics || '[]'),
      image_paths: JSON.parse(n.image_paths || '[]'),
    }));
    res.json(parsed);
  });

  router.get('/export', (req, res) => {
    const { shop_id, status } = req.query;
    let sql = 'SELECT n.*, s.shop_name, p.title as product_title FROM notes n LEFT JOIN shops s ON s.id = n.shop_id LEFT JOIN products p ON p.id = n.product_id WHERE 1=1';
    const params = [];
    if (shop_id) { sql += ' AND n.shop_id = ?'; params.push(shop_id); }
    if (status) { sql += ' AND n.status = ?'; params.push(status); }
    sql += ' ORDER BY n.created_at DESC';
    const notes = db.prepare(sql).all(...params);
    const parsed = notes.map(n => ({
      ...n,
      topics: JSON.parse(n.topics || '[]'),
      image_paths: JSON.parse(n.image_paths || '[]'),
    }));
    res.json(parsed);
  });

  router.get('/:id', (req, res) => {
    const note = db.prepare('SELECT * FROM notes WHERE id = ?').get(req.params.id);
    if (!note) return res.status(404).json({ error: 'Note not found' });
    res.json({
      ...note,
      topics: JSON.parse(note.topics || '[]'),
      image_paths: JSON.parse(note.image_paths || '[]'),
    });
  });

  router.post('/', (req, res) => {
    const { product_id, shop_id, title, content, topics, image_paths } = req.body;
    if (!product_id || !shop_id || !title) {
      return res.status(400).json({ error: 'product_id, shop_id, and title are required' });
    }
    const id = uuidv4();
    db.prepare(
      'INSERT INTO notes (id, product_id, shop_id, title, content, topics, image_paths) VALUES (?, ?, ?, ?, ?, ?, ?)'
    ).run(id, product_id, shop_id, title, content || '', JSON.stringify(topics || []), JSON.stringify(image_paths || []));
    res.status(201).json(db.prepare('SELECT * FROM notes WHERE id = ?').get(id));
  });

  // Batch delete notes (POST because DELETE with body is not reliable)
  router.post('/batch-delete', (req, res) => {
    const { ids } = req.body;
    if (!Array.isArray(ids) || ids.length === 0) {
      return res.status(400).json({ error: 'ids array required' });
    }
    const placeholders = ids.map(() => '?').join(',');
    const result = db.prepare('DELETE FROM notes WHERE id IN (' + placeholders + ')').run(...ids);
    res.json({ deleted: result.changes });
  });

  // Batch delete notes (legacy DELETE route)
  router.delete('/batch', (req, res) => {
    const { ids } = req.body;
    if (!Array.isArray(ids) || ids.length === 0) {
      return res.status(400).json({ error: 'ids array required' });
    }
    const placeholders = ids.map(() => '?').join(',');
    const result = db.prepare('DELETE FROM notes WHERE id IN (' + placeholders + ')').run(...ids);
    res.json({ deleted: result.changes });
  });

  router.post('/batch/approve', (req, res) => {
    const { ids } = req.body;
    if (!Array.isArray(ids) || ids.length === 0) {
      return res.status(400).json({ error: 'ids array required' });
    }
    const placeholders = ids.map(() => '?').join(',');
    db.prepare('UPDATE notes SET status = ?, use_status = ?, updated_at = CURRENT_TIMESTAMP WHERE id IN (' + placeholders + ')').run('approved', 'pending', ...ids);
    const batchNotes = db.prepare('SELECT * FROM notes WHERE id IN (' + placeholders + ')').all(...ids);
    for (const note of batchNotes) {
      createPublishTask(note);
    }
    res.json({ updated: ids.length });
  });

  router.post('/batch/reject', (req, res) => {
    const { ids } = req.body;
    if (!Array.isArray(ids) || ids.length === 0) {
      return res.status(400).json({ error: 'ids array required' });
    }
    const placeholders = ids.map(() => '?').join(',');
    db.prepare('UPDATE notes SET status = ?, use_status = ?, updated_at = CURRENT_TIMESTAMP WHERE id IN (' + placeholders + ')').run('pending', 'pending', ...ids);
    res.json({ updated: ids.length });
  });

  router.post('/batch/publish-reset', (req, res) => {
    const { ids } = req.body;
    if (!Array.isArray(ids) || ids.length === 0) {
      return res.status(400).json({ error: 'ids array required' });
    }
    const placeholders = ids.map(() => '?').join(',');
    const resetNotes = db.prepare(
      'SELECT * FROM notes WHERE id IN (' + placeholders + ") AND status = 'approved' AND use_status = 'failed'"
    ).all(...ids);

    const reset = db.transaction(() => {
      const result = db.prepare(
        'UPDATE notes SET use_status = ?, error_message = ?, updated_at = CURRENT_TIMESTAMP WHERE id IN (' + placeholders + ") AND status = 'approved' AND use_status = 'failed'"
      ).run('pending', '', ...ids);
      for (const note of resetNotes) {
        createPublishTask({ ...note, use_status: 'pending' });
      }
      return result.changes;
    });

    res.json({ updated: reset() });
  });

  router.put('/:id', (req, res) => {
    const note = db.prepare('SELECT * FROM notes WHERE id = ?').get(req.params.id);
    if (!note) return res.status(404).json({ error: 'Note not found' });
    const { title, content, topics, image_paths, status, image_prompt, worker_id } = req.body;
    const nextStatus = status || note.status;
    const nextUseStatus = nextStatus === 'approved' && note.status !== 'approved' ? 'pending' : note.use_status;
    db.prepare(`UPDATE notes SET title=?, content=?, topics=?, image_paths=?, status=?, use_status=?, image_prompt=?, worker_id=?, updated_at=CURRENT_TIMESTAMP WHERE id=?`)
      .run(
        title || note.title,
        content !== undefined ? content : note.content,
        topics ? JSON.stringify(topics) : note.topics,
        image_paths ? JSON.stringify(image_paths) : note.image_paths,
        nextStatus,
        nextUseStatus,
        image_prompt !== undefined ? image_prompt : note.image_prompt,
        worker_id !== undefined ? worker_id : note.worker_id,
        req.params.id
      );
    if (status === 'approved' && note.status !== 'approved') {
      createPublishTask({ ...note, status: 'approved' });
    }
    res.json(db.prepare('SELECT * FROM notes WHERE id = ?').get(req.params.id));
  });

  router.post('/:id/rewrite', async (req, res) => {
    const note = db.prepare('SELECT * FROM notes WHERE id = ?').get(req.params.id);
    if (!note) return res.status(404).json({ error: 'Note not found' });

    const aiConfig = {};
    for (const k of ['ai_api_key', 'ai_model', 'ai_base_url', 'ai_temperature', 'prompt_template']) {
      const row = db.prepare('SELECT value FROM configs WHERE key = ?').get(k);
      aiConfig[k] = row?.value || '';
    }
    if (!aiConfig.ai_api_key) {
      return res.status(400).json({ error: 'AI API key not configured' });
    }

    const product = db.prepare('SELECT * FROM products WHERE id = ?').get(note.product_id);
    const productTitle = product?.title || note.title;

    db.prepare("UPDATE notes SET status='generating', use_status='pending', updated_at=CURRENT_TIMESTAMP WHERE id=?").run(req.params.id);
    // Cancel any pending publish tasks for this note
    db.prepare("UPDATE publish_tasks SET status='failed', updated_at=CURRENT_TIMESTAMP WHERE note_id = ? AND status IN ('pending', 'claimed', 'executing')").run(req.params.id);

    try {
      const promptTemplate = aiConfig.prompt_template || aiConfig.content_prompt_template || '为商品写一篇小红书笔记：{{title}}';
      const prompt = promptTemplate.replace(/\{\{title\}\}/g, productTitle).replace(/\{title\}/g, productTitle);
      const temperature = parseFloat(aiConfig.ai_temperature || '0.8');

      const response = await fetch((aiConfig.ai_base_url || 'https://api.deepseek.com') + '/chat/completions', {
        method: 'POST',
        headers: { 'Content-Type': 'application/json', 'Authorization': 'Bearer ' + aiConfig.ai_api_key },
        body: JSON.stringify({
          model: aiConfig.ai_model || 'deepseek-chat',
          messages: [{ role: 'user', content: prompt }],
          temperature,
          max_tokens: 2000,
        }),
      });

      if (!response.ok) throw new Error('AI API error: ' + response.status);
      const data = await response.json();
      const generated = data.choices?.[0]?.message?.content || '';
      const lines = generated.split('\n').filter(l => l.trim());
      const titleLine = lines.find(l => l.startsWith('#')) || lines[0] || productTitle;
      const title = titleLine.replace(/^#+\s*/, '').trim();
      const content = lines.slice(lines.indexOf(titleLine) + 1).join('\n').trim() || generated;
      const topicMatches = content.match(/#[^\s#]+/g) || [];
      const topics = topicMatches.map(t => t.replace('#', '').trim());

      // Generate new images
      const imageResult = await generateImage(db, req.params.id, productTitle);
      const imagePaths = imageResult.imagePaths || [];
      const imagePrompt = imageResult.imagePrompt || '';

      db.prepare("UPDATE notes SET title=?, content=?, topics=?, image_paths=?, image_prompt=?, status='generated', updated_at=CURRENT_TIMESTAMP WHERE id=?")
        .run(title, content, JSON.stringify(topics), JSON.stringify(imagePaths), imagePrompt, req.params.id);
      res.json({ id: req.params.id, title, content, topics, image_paths: imagePaths });
    } catch (error) {
      db.prepare("UPDATE notes SET status='failed', error_message=?, updated_at=CURRENT_TIMESTAMP WHERE id=?")
        .run(error.message, req.params.id);
      res.status(500).json({ error: error.message });
    }
  });

  router.post('/:id/complete', (req, res) => {
    const note = db.prepare('SELECT * FROM notes WHERE id = ?').get(req.params.id);
    if (!note) return res.status(404).json({ error: 'Note not found' });
    db.prepare("UPDATE notes SET status='approved', use_status='used', publish_result=?, error_message='', published_at=CURRENT_TIMESTAMP, updated_at=CURRENT_TIMESTAMP WHERE id=?")
      .run(JSON.stringify(req.body.result || {}), req.params.id);
    db.prepare("UPDATE publish_tasks SET status='completed', updated_at=CURRENT_TIMESTAMP WHERE note_id=? AND status != 'completed'")
      .run(req.params.id);
    res.json({ success: true });
  });

  router.post('/:id/fail', (req, res) => {
    const note = db.prepare('SELECT * FROM notes WHERE id = ?').get(req.params.id);
    if (!note) return res.status(404).json({ error: 'Note not found' });
    const { error_message } = req.body;
    db.prepare("UPDATE notes SET status='approved', use_status='failed', error_message=?, updated_at=CURRENT_TIMESTAMP WHERE id=?")
      .run(error_message || 'Unknown error', req.params.id);
    db.prepare("UPDATE publish_tasks SET status='failed', error_message=?, updated_at=CURRENT_TIMESTAMP WHERE note_id=? AND status != 'completed'")
      .run(error_message || 'Unknown error', req.params.id);
    res.json({ success: true });
  });

  router.post('/batch', (req, res) => {
    const { product_id, shop_id, notes } = req.body;
    if (!product_id || !shop_id || !Array.isArray(notes)) {
      return res.status(400).json({ error: 'product_id, shop_id, and notes array required' });
    }
    const insert = db.prepare(
      'INSERT INTO notes (id, product_id, shop_id, title, content, topics, image_paths) VALUES (?, ?, ?, ?, ?, ?, ?)'
    );
    const ids = [];
    const batch = db.transaction(() => {
      for (const n of notes) {
        const id = uuidv4();
        insert.run(id, product_id, shop_id, n.title, n.content || '', JSON.stringify(n.topics || []), JSON.stringify(n.image_paths || []));
        ids.push(id);
      }
    });
    batch();
    res.status(201).json({ count: ids.length, ids });
  });

  router.delete('/:id', (req, res) => {
    const result = db.prepare('DELETE FROM notes WHERE id = ?').run(req.params.id);
    if (result.changes === 0) return res.status(404).json({ error: 'Note not found' });
    res.json({ success: true });
  });

  return router;
}

module.exports = createNoteRoutes;