const fs = require('fs')
const path = require('path')
const { createClient } = require('./httpClient')
const cheerio = require('cheerio')
const patternLib = require('./patternLibrary')
const { analyzePage } = require('./pageAnalyzer')

const servicesDir = path.join(__dirname, '..', 'services')

const probeClient = createClient({
  headers: { 'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36' },
  timeout: 10000,
})

const domainLocks = new Map()
const MIN_INTERVAL_MS = 1500

async function throttledProbe(url) {
  let domain
  try { domain = new URL(url).hostname } catch { domain = url }
  const lastCall = domainLocks.get(domain) || 0
  const elapsed = Date.now() - lastCall
  if (elapsed < MIN_INTERVAL_MS) {
    await new Promise(r => setTimeout(r, MIN_INTERVAL_MS - elapsed))
  }
  domainLocks.set(domain, Date.now())
  return probeUrl(url)
}

function resetThrottle() {
  domainLocks.clear()
}

const SEARCH_TERMS = ['Naruto', 'The Matrix']

function getBaseUrl(code) {
  // Buscar BASE_URL (patrón estándar)
  let match = code.match(/BASE_URL\s*=\s*['"]([^'"]+)['"]/)
  if (match) return match[1]

  // Buscar variables con URL base (detailBase, searchBase, apiUrl, siteUrl, etc.)
  // Soporta comillas simples, dobles y backticks
  match = code.match(/(?:detail|search|api|site|base)(?:[Uu]rl|[Bb]ase)\s*=\s*['"`]https?:\/\/[^'"`]+['"`]/)
  if (match) {
    const urlMatch = match[0].match(/https?:\/\/[^'"`]+/)
    if (urlMatch) return urlMatch[0]
  }

  return null
}

function extractUrlPatterns(code) {
  const patterns = []
  // Buscar template literals con ${variable} que contengan paths de URLs
  const re = /`\$\{[^}]+\}([^`]*)`/g
  let m
  while ((m = re.exec(code)) !== null) {
    const path = m[1]
    if (path.length > 1) {  // ignorar paths vacíos
      const isSearch = path.includes('?') || path.includes('q=')
      patterns.push({ path, isSearch, hasVariables: path.includes('${') })
    }
  }
  return patterns
}

const MAX_HTML_SIZE = 50000  // 50KB max per page to prevent OOM

async function probeUrl(url) {
  try {
    const resp = await probeClient.get(url, { validateStatus: () => true })
    const rawHtml = resp.data
    const html = typeof rawHtml === 'string' ? rawHtml.slice(0, MAX_HTML_SIZE) : rawHtml
    return { url, status: resp.status, ok: resp.status === 200, html, length: typeof rawHtml === 'string' ? rawHtml.length : 0 }
  } catch (err) {
    return { url, status: null, ok: false, html: null, length: 0, error: err.message }
  }
}

function stripPath(url) {
  const parsed = new URL(url)
  const segments = parsed.pathname.split('/').filter(Boolean)
  if (segments.length <= 1) return null
  segments.pop()
  return `${parsed.origin}/${segments.join('/')}`
}

async function searchSite(baseUrl, searchPath, query) {
  const url = baseUrl + searchPath
    .replace(/\$\{encodeURIComponent\([^)]+\)\}/g, encodeURIComponent(query))
    .replace(/\$\{[^}]+\}/g, encodeURIComponent(query))

  try {
    const resp = await probeClient.get(url)
    const links = []

    // Handle JSON responses (Next.js data API, etc.)
    if (typeof resp.data === 'object' && resp.data !== null) {
      const movies = resp.data.pageProps?.movies || resp.data.results || []
      for (const m of movies.slice(0, 5)) {
        const slug = m.url?.slug || m.slug || ''
        const title = m.titles?.name || m.title || m.name || slug.split('/').pop()
        if (slug) {
          // Construir URL de detalle en el dominio principal (no en el API domain)
          // wv3.cuevana3.eu → www.cuevana3.eu, api.example.com → www.example.com
          const mainDomain = baseUrl.replace(/https?:\/\/(?:[^.]+\.)?([^/]+)(?:\/.*)?/, (_, domain) => `https://www.${domain}`).replace(/\/_next\/data\/[^/]+/, '')
          const slugParts = slug.split('/')
          const slugName = slugParts[slugParts.length - 1]
          // Detectar tipo: movies/ → /pelicula/, serie/ → /serie/
          const isMovie = slug.startsWith('movies/') || slug.includes('/movies/')
          const pathPrefix = isMovie ? '/pelicula' : '/serie'
          const href = `${mainDomain}${pathPrefix}/${slugName}`
          links.push({ title, href, slug, tmdbId: m.TMDbId })
        }
      }
      return { url, links: links.slice(0, 5), html: null, json: resp.data }
    }

    // Handle HTML responses
    const $ = cheerio.load(resp.data)
    $('a').each((_, el) => {
      const href = $(el).attr('href') || ''
      if (href.includes('/anime/') || href.includes('/movie/') || href.includes('/pelicula/') || href.includes('/serie/')) {
        const title = $(el).text().trim() || $(el).find('h1,h2,h3').text().trim() || href.split('/').pop()
        if (title && !links.find(l => l.href === href)) links.push({ title, href: href.startsWith('http') ? href : baseUrl + href })
      }
    })
    $('li a').each((_, el) => {
      const href = $(el).attr('href') || ''
      if (href.includes('/anime/') || href.includes('/movie/') || href.includes('/pelicula/') || href.includes('/serie/')) {
        const title = $(el).text().trim() || $(el).find('h1,h2,h3,h4').text().trim()
        if (title && !links.find(l => l.href === href)) links.push({ title: title || href.split('/').pop(), href: href.startsWith('http') ? href : baseUrl + href })
      }
    })

    return { url, links: links.slice(0, 5), html: resp.data }
  } catch (err) {
    return { url, links: [], html: null, error: err.message }
  }
}

async function tryDirectPatterns(baseUrl, mediaType, title, slug, tmdbId) {
  const results = []
  // Only try patterns that can be constructed from title data (not search_result-dependent)
  const patterns = patternLib.getDirectFromTitle(mediaType)

  for (const p of patterns.slice(0, 5)) {
    const vars = { slug, id: tmdbId, season: 1, episode: 1, title }
    const urlPath = patternLib.fillUrlTemplate(p.urlTmpl, vars)
    const url = baseUrl.endsWith('/') ? baseUrl.slice(0, -1) + urlPath : baseUrl + urlPath

    const pr = await throttledProbe(url)
    results.push({
      pattern: p.id,
      url,
      status: pr.status,
      ok: pr.ok,
      html: pr.ok ? pr.html : null,
      length: pr.length,
    })

    if (pr.ok && results.filter(r => r.ok).length >= 1) break
  }

  return results
}

function sanitizeToSlug(title) {
  return title
    .toLowerCase()
    .replace(/[áäàâ]/g, 'a').replace(/[éëèê]/g, 'e').replace(/[íïìî]/g, 'i')
    .replace(/[óöòô]/g, 'o').replace(/[úüùû]/g, 'u').replace(/ñ/g, 'n')
    .replace(/[^a-z0-9]+/g, '-')
    .replace(/^-|-$/g, '')
}

const PROVIDER_MEDIA_TYPES = {
  animejl: 'anime', animeonline: 'anime', sololatino: 'anime', 'stremio-anime': 'anime',
  animefenix: 'anime', jkanime: 'anime', aniwave: 'anime',
  cinecalidadrs: 'movie', cinecalidadec: 'movie', cuevana3: 'movie', peliplus: 'movie',
  homecine: 'serie',
}

async function probe(providerName) {
  const servicePath = path.join(servicesDir, `${providerName}Service.js`)
  if (!fs.existsSync(servicePath)) return { error: `Service ${providerName} no encontrado` }

  const code = fs.readFileSync(servicePath, 'utf-8')
  const baseUrl = getBaseUrl(code)
  if (!baseUrl) return { error: 'No se encontró BASE_URL en el código' }

  const mediaType = PROVIDER_MEDIA_TYPES[providerName] || 'movie'
  const patterns = extractUrlPatterns(code)
  const results = []
  let realContentUrls = []
  let patternHits = []
  let searchDone = false

  // --- FASE 1: PROBAR PATRONES DIRECTOS (sin search) ---
  for (const term of SEARCH_TERMS.slice(0, 1)) {
    const slug = sanitizeToSlug(term)
    const directResults = await tryDirectPatterns(baseUrl, mediaType, term, slug, 603)

    for (const dr of directResults) {
      results.push({
        label: `direct(${dr.pattern})`,
        url: dr.url,
        type: 'direct',
        status: dr.status,
        ok: dr.ok,
        length: dr.length,
        html: dr.html,
      })
      if (dr.ok) patternHits.push(dr)
    }
  }

  // Si patrón directo funciona, extraer contenido
  if (patternHits.length > 0) {
    for (const hit of patternHits.slice(0, 2)) {
      // Intentar extraer episodios si es serie/anime
      if (mediaType === 'anime' || mediaType === 'serie') {
        const episodeUrls = [
          hit.url + '/episodio-1',
          hit.url + '/1',
          hit.url + '/episode-1',
          hit.url.replace(/\/$/, '') + '/temporada-1-capitulo-1',
          hit.url.replace(/\/$/, '') + '-temporada-1-capitulo-1',
        ]
        for (const epUrl of episodeUrls.slice(0, 3)) {
          const pr = await throttledProbe(epUrl)
          results.push({
            label: `episode_direct(${epUrl.split('/').pop()})`,
            url: epUrl,
            type: 'episode',
            status: pr.status,
            ok: pr.ok,
            length: pr.length,
            html: pr.ok ? pr.html : null,
          })
        }
      }

      // Extraer estructura del HTML de detalle
      if (hit.html) {
        const structureHints = patternLib.matchByExtractionPattern(hit.html)
        results.push({
          label: `structure_hints(${structureHints.length} found)`,
          url: hit.url,
          type: 'structure',
          status: 200,
          ok: true,
          length: hit.html.length,
          html: null,
          hints: structureHints.map(h => ({ patternId: h.patternId, confidence: h.confidence })),
        })
      }
    }
  }

  // --- FASE 2: SEARCH FALLBACK (solo si directo no funcionó) ---
  const directFailed = patternHits.length === 0
  const noEpisodeData = !results.some(r => r.type === 'episode' && r.ok)

  if (directFailed || noEpisodeData) {
    searchDone = true
    const searchPattern = patterns.find(p => p.isSearch)
    if (searchPattern) {
      for (const term of SEARCH_TERMS) {
        const sr = await searchSite(baseUrl, searchPattern.path, term)
        results.push({
          label: `search(${term})`,
          url: sr.url,
          type: 'search',
          status: sr.error ? null : 200,
          ok: sr.links.length > 0 || !!sr.json,  // OK si hay links o JSON válido
          length: sr.html ? sr.html.length : 0,
          itemsFound: sr.links.length,
          error: sr.error || null,
          html: sr.html || null,
          json: sr.json || null,
        })
        realContentUrls.push(...sr.links.map(l => ({ title: l.title, href: l.href })))
      }

      // Probar detail + episode desde search results
      if (realContentUrls.length > 0) {
        const unique = [...new Set(realContentUrls.map(r => r.href))].slice(0, 2)
        for (const u of unique) {
          const pr = await throttledProbe(u)
          results.push({
            label: `detail_search(${u.split('/').pop()})`, url: u, type: 'detail',
            status: pr.status, ok: pr.ok, length: pr.length, html: pr.ok ? pr.html : null,
          })

          if (pr.ok && (mediaType === 'anime' || mediaType === 'serie')) {
            for (const suffix of ['/episodio-1', '/1']) {
              const ep = await throttledProbe(u + suffix)
              results.push({
                label: `episode_search(${suffix})`, url: u + suffix, type: 'episode',
                status: ep.status, ok: ep.ok, length: ep.length, html: ep.ok ? ep.html : null,
              })
            }

            for (const suffix of ['/episodio-1', '/1']) {
              const epResult = await throttledProbe(u + suffix)
              if (!epResult.ok) {
                let parentUrl = stripPath(u + suffix)
                let depth = 0
                while (parentUrl && depth < 5) {
                  const pr = await throttledProbe(parentUrl)
                  results.push({
                    label: `hierarchy(${parentUrl.split('/').pop()})`, url: parentUrl, type: 'hierarchy',
                    status: pr.status, ok: pr.ok, length: pr.length, html: pr.ok ? pr.html : null, depth,
                  })
                  if (pr.ok) break
                  parentUrl = stripPath(parentUrl)
                  depth++
                }
              }
            }
          }
        }
      }
    }
  }

  // Collect working HTML
  const workingPages = results.filter(r => r.ok && r.html)
  const workingHtml = workingPages.map(p => ({ url: p.url, html: p.html }))

  // Try structure matching on working pages (for LLM context)
  let structureMatches = []
  for (const wp of workingPages.slice(0, 3)) {
    const matches = patternLib.matchByExtractionPattern(wp.html)
    structureMatches.push(...matches.map(m => ({
      url: wp.url,
      patternId: m.patternId,
      confidence: m.confidence,
      matchType: m.matchType,
    })))
  }

  // Learn from successful direct patterns
  if (patternHits.length > 0) {
    for (const hit of patternHits.slice(0, 1)) {
      const domain = new URL(baseUrl).hostname
      const existing = patternLib.matchBySite(baseUrl)
      if (existing.length === 0) {
        patternLib.learnFromFix(
          providerName, baseUrl, mediaType,
          hit.url.replace(baseUrl, ''),
          'auto_probed',
          hit.html || ''
        )
      }
    }
  }

  const workingSlugs = SEARCH_TERMS.map(t => ({
    title: t, slug: sanitizeToSlug(t), id: t === 'Naruto' ? 462 : t === 'The Matrix' ? 603 : null
  })).filter(s => results.some(r => r.ok && (r.url.includes(s.slug) || r.url.includes(encodeURIComponent(s.title)))))

  for (const wp of workingHtml) {
    try {
      const analysis = await analyzePage(wp.html, wp.url)
      if (!analysis.contentHints.hasRealContent && wp.html.length < 100000) {
        const idx = results.findIndex(r => r.url === wp.url && r.ok)
        if (idx !== -1) {
          results[idx] = { ...results[idx], ok: false, emptyContent: true }
          patternHits = patternHits.filter(h => h.url !== wp.url)
        }
      }
    } catch {}
  }

  let pageAnalysis = null
  const homepageHtml = workingHtml.find(h => new URL(h.url).pathname === '/' || new URL(h.url).pathname === '')
  let bestHtml = workingHtml.find(h => h.html.length >= 5000 && results.some(r => r.url === h.url && r.ok))
  if (!bestHtml) bestHtml = workingHtml[0]
  if (bestHtml) {
    try {
      pageAnalysis = await analyzePage(bestHtml.html, bestHtml.url)
      if (homepageHtml && homepageHtml.url !== bestHtml.url) {
        const homeAnalysis = await analyzePage(homepageHtml.html, homepageHtml.url)
        pageAnalysis.homepageType = homeAnalysis.pageType
        pageAnalysis.homepagePatterns = homeAnalysis.linkPatterns
      }
    } catch {}
  }

  return {
    provider: providerName,
    baseUrl,
    mediaType,
    urlResults: results.map(r => ({
      label: r.label, url: r.url, type: r.type,
      status: r.status, ok: r.ok, length: r.length,
      itemsFound: r.itemsFound, error: r.error, depth: r.depth,
      hints: r.hints,
    })),
    hierarchyResults: results.filter(r => r.type === 'hierarchy')
      .map(r => ({ url: r.url, status: r.status, ok: r.ok, depth: r.depth })),
    workingHtml,
    structureMatches,
    patternHits: patternHits.map(h => ({ url: h.url, pattern: h.pattern, status: h.status })),
    searchDone,
    directHit: patternHits.length > 0,
    workingSlugs: workingSlugs.length > 0 ? workingSlugs : null,
    pageAnalysis,
  }
}

module.exports = { probe, throttledProbe, resetThrottle }