import { join } from 'path'

const PORT = 3456
const PIPELINE_ROOT = process.env.PIPELINE_ROOT ||
  join(import.meta.dir, '..', 'data', 'pipeline')
const INTEL_ROOT = join(import.meta.dir, '..', 'data', 'intelligence')
const DIST_ROOT = join(import.meta.dir, '..', 'dist')
const IS_PROD = process.env.NODE_ENV === 'production'

const cors = {
  'Access-Control-Allow-Origin': '*',
  'Access-Control-Allow-Methods': 'GET, OPTIONS',
  'Access-Control-Allow-Headers': 'Content-Type',
  'Content-Type': 'application/json'
}

async function readJson(path: string) {
  const f = Bun.file(path)
  if (!(await f.exists())) return null
  return f.json()
}

async function getProducts() {
  const catalog = await readJson(join(PIPELINE_ROOT, 'catalog.json')) as any[]
  const images = await readJson(join(PIPELINE_ROOT, 'product-images.json')) as Record<string, any>

  return catalog.map((p: any) => {
    const img = images?.[p.sku] || {}
    const intelPath = join(INTEL_ROOT, p.sku, 'review-aspects.json')
    return {
      sku: p.sku,
      name: img.name || p.sku,
      totalReviews: p.total_reviews || 0,
      variants: p.variants || [],
      imageUrl: img.image_url || null,
      productUrl: img.url ? `https://www.justvitamins.co.uk${img.url}` : null,
      hasIntelligence: Bun.file(intelPath).exists()
    }
  }).sort((a: any, b: any) => b.totalReviews - a.totalReviews)
}

async function serveStatic(pathname: string): Promise<Response | null> {
  if (!IS_PROD) return null
  // Strip query string, decode
  const clean = decodeURIComponent(pathname.split('?')[0])
  const filePath = join(DIST_ROOT, clean === '/' ? 'index.html' : clean)
  const f = Bun.file(filePath)
  if (await f.exists()) return new Response(f)
  // SPA fallback — serve index.html for all non-file routes
  const index = Bun.file(join(DIST_ROOT, 'index.html'))
  if (await index.exists()) return new Response(index, { headers: { 'Content-Type': 'text/html' } })
  return null
}

const server = Bun.serve({
  port: PORT,
  async fetch(req) {
    const url = new URL(req.url)
    const path = url.pathname

    if (req.method === 'OPTIONS') return new Response(null, { headers: cors })

    // API routes
    if (path.startsWith('/api/')) {
      // GET /api/products
      if (path === '/api/products') {
        const products = await getProducts()
        const resolved = await Promise.all(
          products.map(async (p: any) => ({ ...p, hasIntelligence: await p.hasIntelligence }))
        )
        return new Response(JSON.stringify(resolved), { headers: cors })
      }

      // GET /api/intelligence/:sku/:view
      const intelMatch = path.match(/^\/api\/intelligence\/([^/]+)\/([^/]+)$/)
      if (intelMatch) {
        const [, sku, view] = intelMatch
        if (view === 'all') {
          const views = ['review-aspects', 'strengths-weaknesses', 'conversion-blockers', 'improvements', 'image-audit', 'photo-brief']
          const result: Record<string, any> = {}
          for (const v of views) {
            const data = await readJson(join(INTEL_ROOT, sku, `${v}.json`))
            if (data) result[v.replace(/-([a-z])/g, (_: string, c: string) => c.toUpperCase())] = data
          }
          return Object.keys(result).length
            ? new Response(JSON.stringify(result), { headers: cors })
            : new Response(JSON.stringify({ error: 'No intelligence data' }), { status: 404, headers: cors })
        }
        const data = await readJson(join(INTEL_ROOT, sku, `${view}.json`))
        return data
          ? new Response(JSON.stringify(data), { headers: cors })
          : new Response(JSON.stringify({ error: 'Not found' }), { status: 404, headers: cors })
      }

      return new Response(JSON.stringify({ error: 'Not found' }), { status: 404, headers: cors })
    }

    // Static file serving in production
    const static_ = await serveStatic(path)
    if (static_) return static_

    return new Response('Not found', { status: 404 })
  }
})

console.log(`JV Dashboard running on http://localhost:${PORT} (${IS_PROD ? 'production' : 'dev'})`)