const formatSize = (size) => {
  if (size === undefined || size === null) { return '—' }
  if (size === 0) { return '0 B' }
  const units = ['B', 'KB', 'MB', 'GB']
  const index = Math.min(units.length - 1, Math.floor(Math.log(size) / Math.log(1024)))
  const formatted = size / Math.pow(1024, index)
  return `${formatted.toFixed(1)} ${units[index]}`
}

const renderPrintField = (label, value, fallback = '—') => {
  const display = value !== undefined && value !== null && value !== '' ? value : fallback
  return `<div class="print-field"><label>${label}</label><span>${display}</span></div>`
}

const renderPrintCustomFields = (fields = [], title, sectionClass = 'print-section') => {
  if (!fields.length) { return '' }
  const items = fields
    .map(field => `<div class="print-field"><label>${field.label}</label><span>${field.value || '—'}</span></div>`)
    .join('')
  return `
    <div class="${sectionClass}">
      <h3>${title}</h3>
      <div class="print-grid">
        ${items}
      </div>
    </div>
  `
}

const renderPrintDocuments = (documents = [], title, sectionClass = 'print-section') => {
  if (!documents.length) { return '' }
  const rows = documents
    .map(doc => `<tr><td>${doc.name}</td><td>${doc.type}</td><td>${doc.size}</td></tr>`)
    .join('')
  return `
    <div class="${sectionClass}">
      <h3>${title}</h3>
      <table class="print-table">
        <thead>
          <tr>
            <th>Nom</th>
            <th>Type</th>
            <th>Taille</th>
          </tr>
        </thead>
        <tbody>${rows}</tbody>
      </table>
    </div>
  `
}

const renderPrintPieces = (
  pieces = [],
  title = 'Pièces indépendantes',
  sectionClass = 'print-section print-section--pieces'
) => {
  if (!pieces.length) { return '' }

  const cards = pieces
    .map((piece, idx) => {
      const indexLabel = piece.indexPath ? piece.indexPath.join('.') : `${idx + 1}`
      const constructeurBadge = piece.constructeur?.name
        ? `<span class="print-badge print-badge--subtle">Constructeur: ${piece.constructeur.name}</span>`
        : ''

      const customFields = (piece.customFields || [])
        .filter(field => field.value && field.value !== '—' && field.value !== '')
        .map(
          field => `
            <li>
              <span class="print-list-label">${field.label}</span>
              <span class="print-list-value">${field.value}</span>
            </li>
          `
        )
        .join('')

      const customFieldsBlock = customFields
        ? `<div class="print-piece-section"><h4>Champs personnalisés</h4><ul class="print-list">${customFields}</ul></div>`
        : ''

      const documentsBlock = (piece.documents || []).length
        ? `<div class="print-piece-section"><h4>Documents</h4><ul class="print-list">${piece.documents
            .map(doc => `<li>${doc.name} <span class="print-list-hint">(${doc.type} • ${doc.size})</span></li>`)
            .join('')}</ul></div>`
        : ''

      return `
        <div class="print-piece-card">
          <div class="print-piece-header">
            <span class="print-index print-index--piece">${indexLabel}</span>
            <div class="print-piece-heading">
              <div class="print-piece-title">${piece.name}</div>
              <div class="print-piece-subtitle">${piece.reference || 'Référence non définie'}</div>
            </div>
            ${constructeurBadge}
          </div>
          ${piece.description ? `<p class="print-piece-description">${piece.description}</p>` : ''}
          <div class="print-piece-meta">
            <div class="print-field-mini">
              <label>Constructeur</label>
              <span>${piece.constructeur?.name || '—'}</span>
            </div>
            <div class="print-field-mini">
              <label>Contact</label>
              <span>${piece.constructeur?.contact || '—'}</span>
            </div>
          </div>
          ${customFieldsBlock}
          ${documentsBlock}
        </div>
      `
    })
    .join('')

  return `
    <div class="${sectionClass}">
      <h3>${title}</h3>
      <div class="print-piece-grid">
        ${cards}
      </div>
    </div>
  `
}

const renderPrintComponents = (components = [], depth = 0, indexPath = []) => {
  if (!components.length) { return '' }
  return components
    .map((component, idx) => {
      const badges = []
      if (component.constructeur?.name) {
        badges.push(`Constructeur: ${component.constructeur.name}`)
      }
      const sectionClass = `print-section print-section--component print-section-depth-${Math.min(depth, 3)}`
      const currentIndex = [...indexPath, idx + 1]
      const indexLabel = currentIndex.join('.')
      return `
        <div class="${sectionClass}">
          <h3>
            <span class="print-index print-index--component">${indexLabel}</span>
            <span>Composant&nbsp;: ${component.name}</span>
          </h3>
          ${component.description ? `<p class="print-muted">${component.description}</p>` : ''}
          ${badges.length ? `<div class="badge-group">${badges.map(badge => `<span class="print-badge">${badge}</span>`).join('')}</div>` : ''}
          ${renderPrintCustomFields(
            component.customFields,
            'Champs personnalisés',
            'print-section print-subsection print-section--custom-fields'
          )}
          ${renderPrintPieces(
            (component.pieces || []).map((piece, pieceIdx) => ({ ...piece, indexPath: [...currentIndex, pieceIdx + 1] })),
            'Pièces du composant',
            'print-section print-subsection print-section--pieces'
          )}
          ${renderPrintDocuments(
            component.documents,
            'Documents du composant',
            'print-section print-subsection print-section--documents'
          )}
          ${renderPrintComponents(component.subComponents || [], depth + 1, currentIndex)}
        </div>
      `
    })
    .join('')
}

const normalizeDocuments = (docs = []) => {
  return docs.map(doc => ({
    id: doc.id,
    name: doc.name || doc.filename || 'Document',
    type: doc.mimeType || doc.type || '—',
    size: formatSize(doc.size)
  }))
}

const normalizeCustomFields = (values = []) => {
  return values.map(value => ({
    id: value.id,
    label: value.customField?.name || 'Champ',
    value: value.value || '—'
  }))
}

const normalizeConstructeur = (constructeur) => {
  if (!constructeur) { return null }
  return {
    name: constructeur.name || '—',
    contact: [constructeur.email, constructeur.phone].filter(Boolean).join(' • ') || '—'
  }
}

const normalizePiece = piece => ({
  id: piece.id,
  name: piece.name || 'Pièce sans nom',
  description: piece.description || '',
  reference: piece.reference || '',
  customFields: normalizeCustomFields(piece.customFieldValues || []),
  documents: normalizeDocuments(piece.documents || []),
  constructeur: normalizeConstructeur(piece.constructeur),
  indexPath: piece.indexPath || null
})

const normalizeComponent = component => ({
  id: component.id,
  name: component.name || 'Composant sans nom',
  description: component.description || '',
  customFields: normalizeCustomFields(component.customFieldValues || []),
  documents: normalizeDocuments(component.documents || []),
  pieces: (component.pieces || []).map(normalizePiece),
  subComponents: (component.sousComposants || component.subComponents || []).map(normalizeComponent),
  constructeur: normalizeConstructeur(component.constructeur)
})

export const buildMachinePrintContext = ({
  machine,
  machineName,
  machineReference,
  machinePieces = [],
  components = [],
  selection
}) => {
  const selectionState = selection || {}
  const machineSelection = selectionState.machine || {}
  const componentSelection = selectionState.components || {}
  const pieceSelection = selectionState.pieces || {}

  const includeMachineInfo = machineSelection.info !== false
  const includeMachineCustomFields = machineSelection.customFields !== false
  const includeMachineDocuments = machineSelection.documents !== false

  const isComponentSelected = (id) => {
    if (!id) { return true }
    if (Object.prototype.hasOwnProperty.call(componentSelection, id)) {
      return componentSelection[id]
    }
    return true
  }

  const isPieceSelected = (id) => {
    if (!id) { return true }
    if (Object.prototype.hasOwnProperty.call(pieceSelection, id)) {
      return pieceSelection[id]
    }
    return true
  }

  const machineBadges = []
  if (machine?.typeMachine?.category) {
    machineBadges.push(machine.typeMachine.category)
  }
  if (machine?.site?.name) {
    machineBadges.push(`Site: ${machine.site.name}`)
  }
  if (machineReference) {
    machineBadges.push(`Ref: ${machineReference}`)
  }

  const normalizedPieces = machinePieces
    .map(normalizePiece)
    .filter(piece => isPieceSelected(piece.id))
    .map((piece, idx) => ({
      ...piece,
      indexPath: [idx + 1]
    }))

  const normalizedComponents = components.map(normalizeComponent)

  const filterComponentTree = (component) => {
    const filteredPieces = (component.pieces || []).filter(piece => isPieceSelected(piece.id))
    const filteredSubComponents = (component.subComponents || [])
      .map(filterComponentTree)
      .filter(Boolean)

    const includeSelf = isComponentSelected(component.id)
    const shouldInclude = includeSelf || filteredPieces.length > 0 || filteredSubComponents.length > 0

    if (!shouldInclude) {
      return null
    }

    return {
      ...component,
      pieces: filteredPieces,
      subComponents: filteredSubComponents
    }
  }

  const filteredComponents = normalizedComponents
    .map(filterComponentTree)
    .filter(Boolean)

  return {
    generatedAt: new Date().toLocaleString('fr-FR'),
    machine: {
      id: machine?.id || null,
      name: machineName,
      description: machine?.description || '',
      typeDescription: machine?.typeMachine?.description || '',
      reference: machineReference,
      site: machine?.site?.name || '',
      category: machine?.typeMachine?.category || '',
      badges: machineBadges,
      constructeur: normalizeConstructeur(machine?.constructeur),
      includeInfo: includeMachineInfo,
      customFields: includeMachineCustomFields
        ? normalizeCustomFields(machine?.customFieldValues || [])
        : [],
      documents: includeMachineDocuments
        ? normalizeDocuments(machine?.documents || [])
        : []
    },
    components: filteredComponents,
    pieces: normalizedPieces
  }
}

export const buildMachinePrintHtml = (context, styles) => {
  const title = context.machine.name ? `Impression - ${context.machine.name}` : 'Impression machine'
  const badgesHtml = context.machine.badges
    .map(badge => `<span class="print-badge">${badge}</span>`)
    .join('')
  const sections = []

  sections.push(`
    <div class="print-metadata">
      <span>Généré le ${context.generatedAt}</span>
      <span>Machine ID: ${context.machine.id || '—'}</span>
    </div>
    <div class="print-header">
      <div class="title-block">
        <div class="print-title">${context.machine.name || 'Machine sans nom'}</div>
        <div class="print-subtitle">${
          context.machine.description || context.machine.typeDescription || 'Aucune description disponible'
        }</div>
      </div>
      <div class="badge-group">${badgesHtml}</div>
    </div>
  `)

  if (context.machine.includeInfo) {
    sections.push(`
      <div class="print-section print-section--machine">
        <h3>Informations générales</h3>
        <div class="print-grid">
          ${renderPrintField('Nom', context.machine.name)}
          ${renderPrintField('Référence', context.machine.reference, 'Non définie')}
          ${renderPrintField('Site', context.machine.site, 'Non défini')}
          ${renderPrintField('Constructeur', context.machine.constructeur?.name, 'Non défini')}
          ${renderPrintField('Contact Constructeur', context.machine.constructeur?.contact, 'Non défini')}
        </div>
      </div>
    `)
  }

  const customFieldsSection = renderPrintCustomFields(
    context.machine.customFields,
    'Champs personnalisés de la machine',
    'print-section print-section--custom-fields'
  )
  if (customFieldsSection) {
    sections.push(customFieldsSection)
  }

  const documentsSection = renderPrintDocuments(
    context.machine.documents,
    'Documents liés à la machine',
    'print-section print-section--documents'
  )
  if (documentsSection) {
    sections.push(documentsSection)
  }

  const componentsSection = renderPrintComponents(context.components)
  if (componentsSection) {
    sections.push(componentsSection)
  }

  const piecesSection = renderPrintPieces(
    context.pieces,
    'Pièces indépendantes',
    'print-section print-section--pieces'
  )
  if (piecesSection) {
    sections.push(piecesSection)
  }

  sections.push(`
    <div class="print-section print-muted">
      Rapport généré automatiquement par Inventaire Pro.
    </div>
  `)

  const content = sections.join('\n')

  return `<!DOCTYPE html>
    <html lang="fr">
      <head>
        <meta charset="utf-8" />
        <meta name="viewport" content="width=device-width, initial-scale=1" />
        <meta name="color-scheme" content="light only" />
        <title>${title}</title>
        ${styles}
        <style>
          /* ============ Design tokens (sobre & pro) ============ */
          :root{
            --bg: #ffffff;
            --ink: #0f172a;              /* slate-900 */
            --muted: #475569;            /* slate-600 */
            --line: #cbd5e1;             /* slate-300 */
            --line-soft: #e2e8f0;        /* slate-200 */
            --accent: #1f2937;           /* gray-800 */
            --accent-ink: #111827;       /* gray-900 */
            --brand: #0ea5e9;            /* sky-500 (léger) */
            --brand-ink: #075985;        /* sky-800 */
            --ok: #059669;               /* emerald-600 */
            --warn: #ea580c;             /* orange-600 */
            --comp: #be185d;             /* pink-700 */
            --radius-xs: 2px;
            --radius-sm: 4px;
            --radius-md: 6px;
            --radius-lg: 8px;
            --shadow-0: none;
            --shadow-1: 0 1px 0 rgba(15,23,42,.04);
            --shadow-2: 0 2px 8px rgba(15,23,42,.06);
          }

          /* ============ Base ============ */
          @page { margin: 16mm 14mm; }
          html, body { height: 100%; }
          body {
            font-family: ui-sans-serif, system-ui, -apple-system, Segoe UI, Roboto, Inter, Helvetica, Arial, "Apple Color Emoji", "Segoe UI Emoji";
            background: #F9FAFB;
            color: var(--ink);
            -webkit-print-color-adjust: exact !important;
            print-color-adjust: exact !important;
          }

          .print-layout { max-width: 1120px; margin: 0 auto; padding: 28px; display: flex; flex-direction: column; gap: 20px; }

          .print-metadata {
            font-size: 11px; color: var(--muted); display: flex; justify-content: space-between; align-items: center; gap: 12px;
            letter-spacing: .04em; text-transform: uppercase; border-bottom: 1px solid var(--line); padding-bottom: 8px;
          }

          .print-header {
            display: flex; justify-content: space-between; align-items: flex-start; gap: 24px;
            background: var(--bg); padding: 18px 20px; border: 1px solid var(--line); border-radius: var(--radius-md);
            box-shadow: var(--shadow-2);
          }
          .print-header .title-block { flex: 1; }
          .print-title { font-size: 26px; font-weight: 800; margin: 0 0 6px; color: var(--accent-ink); }
          .print-subtitle { font-size: 14px; color: var(--muted); margin: 0; line-height: 1.5; }

          .badge-group { display: flex; flex-wrap: wrap; gap: 8px; justify-content: flex-end; }
          .print-badge {
            display: inline-flex; align-items: center; padding: 4px 8px; border-radius: var(--radius-sm);
            font-size: 11px; font-weight: 600; letter-spacing: .04em; text-transform: uppercase;
            background: #e0f2fe; color: var(--brand-ink); border: 1px solid #bae6fd;
          }
          .print-badge--subtle { background: #f1f5f9; border-color: var(--line); color: #334155; }

          .print-index {
            display: inline-flex; align-items: center; justify-content: center; min-width: 24px; height: 24px;
            border-radius: var(--radius-sm); font-size: 12px; font-weight: 700; margin-right: 8px;
            box-shadow: inset 0 0 0 1px var(--line);
          }
          .print-index--component { background: #fde2f2; color: var(--comp); }
          .print-index--piece { background: #ffedd5; color: var(--warn); }

          /* ============ Sections ============ */
          .print-section, .print-section.print-subsection, .print-piece-card { break-inside: avoid; page-break-inside: avoid; }
          .print-section {
            margin: 0; padding: 20px 22px; border-radius: var(--radius-md);
            border: 1px solid var(--line); background: var(--bg); box-shadow: var(--shadow-2); position: relative;
          }
          .print-section + .print-section { margin-top: 8px; }
          .print-section h3 {
            font-size: 16px; font-weight: 800; margin: 0 0 14px; letter-spacing: .02em; color: var(--accent);
            border-left: 3px solid var(--accent); padding-left: 10px;
          }

          .print-section--machine { border-left: 3px solid var(--brand); }
          .print-section--custom-fields { border-left: 3px solid #7c3aed; }
          .print-section--documents { border-left: 3px solid var(--ok); }
          .print-section--component { border-left: 3px solid var(--comp); }
          .print-section--pieces { border-left: 3px solid var(--warn); }

          .print-section.print-subsection {
            margin-top: 14px; margin-bottom: 10px; padding: 16px 18px; border-radius: var(--radius-sm);
            box-shadow: var(--shadow-1); background: #fcfcfd;
          }

          /* ============ Fields (grid) ============ */
          .print-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(220px, 1fr)); gap: 12px; }
          .print-field {
            display: flex; flex-direction: column; padding: 10px 12px; border-radius: var(--radius-sm);
            background: #fafbfc; border: 1px solid var(--line-soft); min-height: 72px;
          }
          .print-field label { font-size: 10px; text-transform: uppercase; color: #64748b; letter-spacing: .08em; margin-bottom: 8px; }
          .print-field span { font-size: 14px; color: var(--ink); font-weight: 600; line-height: 1.45; }

          /* ============ Pieces ============ */
          .print-piece-grid { display: grid; grid-template-columns: repeat(auto-fill, minmax(260px, 1fr)); gap: 12px; }
          .print-piece-card {
            padding: 14px 16px; border-radius: var(--radius-md); border: 1px solid #fed7aa; background: var(--bg); box-shadow: var(--shadow-1);
            display: flex; flex-direction: column; gap: 10px;
          }
          .print-piece-header { display: flex; align-items: center; gap: 10px; flex-wrap: wrap; }
          .print-piece-heading { flex: 1 1 160px; }
          .print-piece-title { font-size: 15px; font-weight: 800; color: #7c2d12; }
          .print-piece-subtitle { font-size: 11px; color: #a16207; text-transform: uppercase; letter-spacing: .06em; margin-top: 2px; }
          .print-piece-description { font-size: 12px; color: #7c2d12; margin: 0; }

          .print-piece-meta { display: grid; grid-template-columns: repeat(auto-fit, minmax(120px, 1fr)); gap: 8px; }
          .print-field-mini {
            padding: 8px 10px; border-radius: var(--radius-sm); background: #fff7ed; border: 1px solid #fed7aa; display: flex; flex-direction: column; gap: 4px;
          }
          .print-field-mini label { font-size: 9px; text-transform: uppercase; color: #9a3412; letter-spacing: .06em; }
          .print-field-mini span { font-size: 12px; font-weight: 700; color: #7c2d12; }
          .print-piece-section { display: flex; flex-direction: column; gap: 6px; }
          .print-piece-section h4 { font-size: 11px; font-weight: 800; text-transform: uppercase; letter-spacing: .06em; color: #7c2d12; margin: 0; }
          .print-list { margin: 0; padding-left: 16px; display: grid; gap: 4px; }
          .print-list li { font-size: 12px; color: #475569; break-inside: avoid; }
          .print-list-label { font-weight: 700; color: #7c2d12; margin-right: 4px; }
          .print-list-value { color: var(--ink); }
          .print-list-hint { color: #64748B; }

          /* ============ Tables ============ */
          .print-table { width: 100%; border-collapse: collapse; margin-top: 8px; font-size: 13px; border: 1px solid var(--line); border-radius: var(--radius-sm); overflow: hidden; }
          .print-table th, .print-table td { border: 1px solid var(--line-soft); padding: 10px 12px; text-align: left; vertical-align: top; }
          .print-table thead th { background: #f1f5f9; font-weight: 800; letter-spacing: .02em; text-transform: uppercase; color: var(--accent); font-size: 12px; }
          .print-table tr { break-inside: avoid; page-break-inside: avoid; }
          .print-section--documents .print-table thead th { background: #ecfdf5; color: #065f46; }
          .print-section--pieces .print-table thead th { background: #fffbeb; color: #92400e; }
          .print-section--component .print-table thead th { background: #fdf2f8; color: #831843; }

          /* ============ Utilities ============ */
          .print-muted { color: var(--muted); }
          .sr-only { position: absolute; width: 1px; height: 1px; padding: 0; margin: -1px; overflow: hidden; clip: rect(0,0,0,0); border: 0; }

          /* ============ Print media ============ */
          @media print {
            body { background: white; }
            .print-layout { padding: 0; max-width: none; }
            .print-header, .print-section, .print-section.print-subsection, .print-piece-card, .print-table { box-shadow: var(--shadow-0); }
            .print-section, .print-section.print-subsection, .print-piece-card { break-inside: avoid-page; page-break-inside: avoid; }
            .badge-group { justify-content: flex-start; }
            .print-metadata { border-bottom-color: var(--line); }
            /* Force couleurs d’accent légères pour économie d’encre */
            .print-badge { background: #e5f3fb !important; border-color: #d1e7f8 !important; }
            .print-index--component { background: #fbe7f3 !important; }
            .print-index--piece { background: #fff1e6 !important; }
          }
        </style>
      </head>
      <body>
        <div class="print-layout">
          ${content}
        </div>
      </body>
    </html>`
}