const express = require('express');
const router = express.Router();
const { fetchJSON, uploadJSON, listImages, listTemplateFiles } = require('../services/pixelbin');
const { processCurl } = require('../services/openai2');

// GET /api/templates/images — must be BEFORE /:slug to avoid conflict
router.get('/images', async (req, res) => {
  try {
    const images = await listImages(`brands/${process.env.MERCHANT_ID}/images`);
    res.json({ images });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// GET /api/templates
router.get('/', async (req, res) => {
  try {
    const merchantId = process.env.MERCHANT_ID;
    const folder = `brands/${merchantId}/templates`;
    console.log(`[Templates] GET /api/templates start | merchant=${merchantId} | pid=${process.pid}`);
    const slugs = await listTemplateFiles(folder);
    console.log(`[Templates] GET /api/templates files | merchant=${merchantId} | slugs=[${slugs.join(', ')}]`);
    const templates = [];
    for (const slug of slugs) {
      const tmpl = await fetchJSON(folder, slug);
      if (tmpl) {
        console.log(
          `[Templates] GET /api/templates item | merchant=${merchantId} | slug=${slug} | eventSlug=${tmpl.eventSlug || 'n/a'} | approved=${!!tmpl.approvedVariant} | updatedAt=${tmpl.updatedAt || 'n/a'}`
        );
        templates.push(tmpl);
      } else {
        console.log(`[Templates] GET /api/templates item-miss | merchant=${merchantId} | slug=${slug}`);
      }
    }
    console.log(`[Templates] GET /api/templates done | merchant=${merchantId} | count=${templates.length}`);
    res.json({ templates });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// GET /api/templates/:slug
router.get('/:slug', async (req, res) => {
  try {
    const merchantId = process.env.MERCHANT_ID;
    const slug = req.params.slug;
    const folder = `brands/${merchantId}/templates`;
    console.log(`[Templates] GET /api/templates/:slug start | merchant=${merchantId} | slug=${slug} | pid=${process.pid}`);
    const tmpl = await fetchJSON(folder, slug);
    if (!tmpl) return res.status(404).json({ error: 'Template not found' });
    console.log(
      `[Templates] GET /api/templates/:slug done | merchant=${merchantId} | slug=${slug} | approved=${!!tmpl.approvedVariant} | updatedAt=${tmpl.updatedAt || 'n/a'}`
    );
    res.json(tmpl);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// POST /api/templates/:slug/approve
router.post('/:slug/approve', async (req, res) => {
  try {
    const { approvedVariant } = req.body;
    if (!approvedVariant) return res.status(400).json({ error: 'approvedVariant is required' });

    const merchantId = process.env.MERCHANT_ID;
    const slug = req.params.slug;
    const folder = `brands/${merchantId}/templates`;
    console.log(
      `[Templates] POST /api/templates/:slug/approve start | merchant=${merchantId} | slug=${slug} | incomingLen=${approvedVariant.length} | pid=${process.pid}`
    );
    const tmpl = await fetchJSON(folder, slug);
    if (!tmpl) return res.status(404).json({ error: 'Template not found' });
    console.log(
      `[Templates] POST /api/templates/:slug/approve before | merchant=${merchantId} | slug=${slug} | approved=${!!tmpl.approvedVariant} | updatedAt=${tmpl.updatedAt || 'n/a'}`
    );

    tmpl.approvedVariant = approvedVariant;
    tmpl.whitelistStatus = 'submitted';
    tmpl.updatedAt = new Date().toISOString();
    await uploadJSON(folder, slug, tmpl);
    console.log(
      `[Templates] POST /api/templates/:slug/approve after | merchant=${merchantId} | slug=${slug} | approved=${!!tmpl.approvedVariant} | updatedAt=${tmpl.updatedAt}`
    );
    res.json(tmpl);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// POST /api/templates/:slug/curl
router.post('/:slug/curl', async (req, res) => {
  try {
    const { rawCurl } = req.body;
    if (!rawCurl) return res.status(400).json({ error: 'rawCurl is required' });

    const folder = `brands/${process.env.MERCHANT_ID}/templates`;
    const tmpl = await fetchJSON(folder, req.params.slug);
    if (!tmpl) return res.status(404).json({ error: 'Template not found' });
    if (!tmpl.approvedVariant) return res.status(400).json({ error: 'Template must have an approved variant first' });

    const { processedCurl, variableMap } = await processCurl(rawCurl, tmpl.approvedVariant, req.params.slug);
    tmpl.rawCurl = rawCurl;
    tmpl.processedCurl = processedCurl;
    tmpl.variableMap = variableMap;
    tmpl.updatedAt = new Date().toISOString();
    await uploadJSON(folder, req.params.slug, tmpl);
    res.json({ processedCurl, variableMap });
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

// POST /api/templates/:slug/image
router.post('/:slug/image', async (req, res) => {
  try {
    const { imagePath } = req.body;
    if (imagePath === undefined) return res.status(400).json({ error: 'imagePath is required' });

    const folder = `brands/${process.env.MERCHANT_ID}/templates`;
    const tmpl = await fetchJSON(folder, req.params.slug);
    if (!tmpl) return res.status(404).json({ error: 'Template not found' });

    tmpl.selectedImagePath = imagePath;
    tmpl.updatedAt = new Date().toISOString();
    await uploadJSON(folder, req.params.slug, tmpl);
    res.json(tmpl);
  } catch (err) {
    res.status(500).json({ error: err.message });
  }
});

module.exports = router;