exports.generatePicturePrompt = (project = {}) => {
  const {
    title = '',
    lyrics: lyricsRaw,
    musicConfig = {},
    coverStyle: coverStyleRaw = '',
    artistName: artistNameRaw = '',
  } = project || {}

  // --- 1. Nettoyage et Normalisation ---
  const sanitizeInline = (value = '') => {
    if (typeof value !== 'string') return ''
    return value
      .replace(/[\r\n]+/g, ' ')
      .replace(/[<>]/g, '')
      .trim()
  }

  const titleForPrompt = sanitizeInline(title) || 'Sans titre'
  const artistName = sanitizeInline(artistNameRaw) || sanitizeInline(project?.userName || '')
  const hasArtistName = artistName.length > 0

  const { genres = [], tempo = '', mood = '', instruments = [] } = musicConfig || {}
  const userStyle = sanitizeInline(coverStyleRaw)

  // --- 2. Intelligence Visuelle (Mapping) ---

  // Détermination de l'énergie visuelle
  const isEnergetic =
    tempo && /\b(rapid|fast|vite|agité|upbeat|energ|dance|rock|metal)\b/i.test(String(tempo))
  const isDark =
    mood && /\b(sombre|triste|dark|sad|mélancoli|nuit|night|eerie)\b/i.test(String(mood))

  // Construction de la Palette & Lumière
  let visualAtmosphere = ''
  if (isDark) {
    visualAtmosphere =
      'Atmosphere: Cinematic atmosphere, moody shadows, deep contrast. Palette: Midnight blue, obsidian, deep purple, metallic accents.'
  } else if (isEnergetic) {
    visualAtmosphere =
      'Atmosphere: Dynamic atmosphere, high energy, vibrant saturation. Palette: Neon colors, electric blue, magenta, bright yellow, high contrast.'
  } else {
    visualAtmosphere =
      'Atmosphere: Soft atmosphere, harmonious and ethereal. Palette: Pastel tones, warm gold, soft coral, balanced and elegant colors.'
  }

  // Définition du Style de Rendu (Si l'utilisateur est vague, on renforce)
  let renderingStyle = userStyle ? `Art Style: ${userStyle}` : 'Art Style: Digital Art, Mixed Media'

  if (userStyle.toLowerCase().includes('realist') || userStyle.toLowerCase().includes('photo')) {
    renderingStyle +=
      ', 8k resolution, highly detailed texture, photorealistic, cinematic depth of field, raytracing.'
  } else if (
    userStyle.toLowerCase().includes('illu') ||
    userStyle.toLowerCase().includes('dessin')
  ) {
    renderingStyle +=
      ', vector art, clean lines, professional illustration, flat design or detailed painting.'
  } else {
    // Style par défaut "Album Cover" qui marche bien
    renderingStyle += ', abstract surrealism, conceptual album art, high fidelity, masterpiece.'
  }

  // --- 3. Extraction de l'Inspiration (Lyrics) ---

  // On cherche le REFRAIN en priorité pour l'image, car c'est le cœur visuel
  const sections = Array.isArray(lyricsRaw) ? lyricsRaw : []
  const chorus = sections.find((s) => s.type === 'refrain' || s.type === 'chorus')
  const verse = sections.find((s) => s.type === 'couplet' || s.type === 'verse')

  // On prend 2 lignes max du refrain, ou du premier couplet
  const visualHook = (chorus?.lyrics || verse?.lyrics || '')
    .split('\n')
    .filter((l) => l.length > 10) // On évite les lignes trop courtes
    .slice(0, 2)
    .join('. ')

  const imageryPrompt = visualHook
    ? `Visual Inspiration: An interpretation of these lyrics: "${visualHook}".`
    : "Visual Inspiration: Abstract visual representation of the song's mood."

  // --- 4. Construction du Prompt Final (Structure Optimisée Imagen 3) ---

  const promptParts = [
    // Rôle
    'Design a professional, high-quality music album cover.',

    // 1. Le Texte (Crucial pour Imagen 3 - Doit être au début ou très clair)
    `**Typography & Text:**`,
    `The song title "${titleForPrompt}" must be the CENTERPIECE. Write it in a distinct font that matches the mood.`,
    hasArtistName
      ? `The artist name "${artistName}" must appear smaller, elegant, and legible near the bottom or top.`
      : '',
    'Ensure perfect spelling. The text should be integrated into the artwork (e.g., metallic texture, neon glow, or bold cut-out), not just pasted on top.',

    // 2. Le Visuel
    `**Visuals:**`,
    renderingStyle,
    imageryPrompt,
    `Subject: A central visual element that represents the song. ${isEnergetic ? 'Dynamic composition.' : 'Balanced, centered composition.'}`,

    // 3. L'Atmosphère (Context from music config)
    `**Mood & Color:**`,
    visualAtmosphere,
    genres.length > 0 ? `Musical Vibe Reference: ${genres.join(', ')}.` : '',

    // 4. Contraintes Négatives (Phrasées positivement pour l'IA)
    '**Constraints:**',
    'Use a square 1:1 aspect ratio.',
    'Do NOT depict literal musical instruments (like guitars or microphones) unless they are part of a surreal abstract composition.',
    'No blurry text. No messy borders. No watermarks.',
  ]

  return promptParts.filter(Boolean).join('\n\n')
}