// Trip PDF via browser print window
import { createElement } from 'react'
import { getCategoryIcon } from '../shared/categoryIcons'
import { mapsApi } from '../../api/client'

// ── SVG inline icons (for chips) ─────────────────────────────────────────────
const svgPin   = `<svg width="11" height="11" viewBox="0 0 24 24" fill="#94a3b8" style="flex-shrink:0;margin-top:1px"><path d="M12 2C8.13 2 5 5.13 5 9c0 5.25 7 13 7 13s7-7.75 7-13c0-3.87-3.13-7-7-7z"/><circle cx="12" cy="9" r="2.5" fill="white"/></svg>`
const svgClock = `<svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="#374151" stroke-width="2" stroke-linecap="round"><circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 3"/></svg>`
const svgClock2= `<svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="#d97706" stroke-width="2" stroke-linecap="round"><circle cx="12" cy="12" r="9"/><path d="M12 7v5l3 3"/></svg>`
const svgCheck = `<svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="#059669" stroke-width="2.5" stroke-linecap="round" stroke-linejoin="round"><path d="M5 12l5 5L19 7"/></svg>`
const svgEuro  = `<svg width="10" height="10" viewBox="0 0 24 24" fill="none" stroke="#059669" stroke-width="2" stroke-linecap="round"><path d="M14 5c-3.87 0-7 3.13-7 7s3.13 7 7 7c2.17 0 4.1-.99 5.4-2.55"/><path d="M5 11h8M5 13h8"/></svg>`

function escHtml(str) {
  if (!str) return ''
  return String(str).replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;').replace(/"/g, '&quot;')
}

function absUrl(url) {
  if (!url) return null
  if (url.startsWith('http://') || url.startsWith('https://') || url.startsWith('data:')) return url
  return window.location.origin + (url.startsWith('/') ? '' : '/') + url
}

function safeImg(url) {
  if (!url) return null
  if (url.startsWith('https://') || url.startsWith('http://')) return url
  return /\.(jpe?g|png|webp|bmp|tiff?)(\?.*)?$/i.test(url) ? absUrl(url) : null
}

// Generate SVG string from Lucide icon name (for category thumbnails)
let _renderToStaticMarkup = null
async function ensureRenderer() {
  if (!_renderToStaticMarkup) {
    const mod = await import('react-dom/server')
    _renderToStaticMarkup = mod.renderToStaticMarkup
  }
}
function categoryIconSvg(iconName, color = '#6366f1', size = 24) {
  if (!_renderToStaticMarkup) return ''
  const Icon = getCategoryIcon(iconName)
  return _renderToStaticMarkup(
    createElement(Icon, { size, strokeWidth: 1.8, color: 'rgba(255,255,255,0.92)' })
  )
}

function shortDate(d, locale) {
  if (!d) return ''
  return new Date(d + 'T00:00:00').toLocaleDateString(locale, { weekday: 'short', day: 'numeric', month: 'short' })
}

function longDateRange(days, locale) {
  const dd = [...days].filter(d => d.date).sort((a, b) => a.day_number - b.day_number)
  if (!dd.length) return null
  const f = new Date(dd[0].date + 'T00:00:00')
  const l = new Date(dd[dd.length - 1].date + 'T00:00:00')
  return `${f.toLocaleDateString(locale, { day: 'numeric', month: 'long' })} – ${l.toLocaleDateString(locale, { day: 'numeric', month: 'long', year: 'numeric' })}`
}

function dayCost(assignments, dayId, locale) {
  const total = (assignments[String(dayId)] || []).reduce((s, a) => s + (parseFloat(a.place?.price) || 0), 0)
  return total > 0 ? `${total.toLocaleString(locale)} EUR` : null
}

// Pre-fetch Google Place photos for all assigned places
async function fetchPlacePhotos(assignments) {
  const photoMap = {} // placeId → photoUrl
  const allPlaces = Object.values(assignments).flatMap(a => a.map(x => x.place)).filter(Boolean)
  const unique = [...new Map(allPlaces.map(p => [p.id, p])).values()]

  const toFetch = unique.filter(p => !p.image_url && p.google_place_id)

  await Promise.allSettled(
    toFetch.map(async (place) => {
      try {
        const data = await mapsApi.placePhoto(place.google_place_id)
        if (data.photoUrl) photoMap[place.id] = data.photoUrl
      } catch {}
    })
  )
  return photoMap
}

export async function downloadTripPDF({ trip, days, places, assignments, categories, dayNotes, t: _t, locale: _locale }) {
  await ensureRenderer()
  const loc = _locale || 'de-DE'
  const tr = _t || (k => k)
  const sorted = [...(days || [])].sort((a, b) => a.day_number - b.day_number)
  const range = longDateRange(sorted, loc)
  const coverImg = safeImg(trip?.cover_image)

  // Pre-fetch place photos from Google
  const photoMap = await fetchPlacePhotos(assignments)

  const totalAssigned = new Set(
    Object.values(assignments || {}).flatMap(a => a.map(x => x.place?.id)).filter(Boolean)
  ).size
  const totalCost = Object.values(assignments || {})
    .flatMap(a => a).reduce((s, a) => s + (parseFloat(a.place?.price) || 0), 0)

  // Build day HTML
  const daysHtml = sorted.map((day, di) => {
    const assigned = assignments[String(day.id)] || []
    const notes = (dayNotes || []).filter(n => n.day_id === day.id)
    const cost = dayCost(assignments, day.id, loc)

    const merged = []
    assigned.forEach(a => merged.push({ type: 'place', k: a.sort_order ?? 0, data: a }))
    notes.forEach(n    => merged.push({ type: 'note',  k: n.sort_order ?? 0, data: n }))
    merged.sort((a, b) => a.k - b.k)

    let pi = 0
    const itemsHtml = merged.length === 0
      ? `<div class="empty-day">${escHtml(tr('dayplan.emptyDay'))}</div>`
      : merged.map(item => {
          if (item.type === 'note') {
            const note = item.data
            return `
              <div class="note-card">
                <div class="note-line"></div>
                <svg class="note-icon" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="#94a3b8" stroke-width="1.8" stroke-linecap="round">
                  <rect x="4" y="3" width="16" height="18" rx="2"/>
                  <line x1="8" y1="8" x2="16" y2="8"/>
                  <line x1="8" y1="12" x2="16" y2="12"/>
                  <line x1="8" y1="16" x2="13" y2="16"/>
                </svg>
                <div class="note-body">
                  <div class="note-text">${escHtml(note.text)}</div>
                  ${note.time ? `<div class="note-time">${escHtml(note.time)}</div>` : ''}
                </div>
              </div>`
          }

          pi++
          const place = item.data.place
          if (!place) return ''
          const cat = categories.find(c => c.id === place.category_id)
          const color = cat?.color || '#6366f1'

          // Image: direct > google photo > fallback icon
          const directImg = safeImg(place.image_url)
          const googleImg = photoMap[place.id] || null
          const img = directImg || googleImg

          const confirmed = place.reservation_status === 'confirmed'
          const pending   = place.reservation_status === 'pending'

          const iconSvg = categoryIconSvg(cat?.icon, color, 24)
          const thumbHtml = img
            ? `<img class="place-thumb" src="${escHtml(img)}" />`
            : `<div class="place-thumb-fallback" style="background:${color}">
                 ${iconSvg}
               </div>`

          const chips = [
            place.place_time ? `<span class="chip">${svgClock}${escHtml(place.place_time)}</span>` : '',
            place.price && parseFloat(place.price) > 0 ? `<span class="chip chip-green">${svgEuro}${Number(place.price).toLocaleString('de-DE')} EUR</span>` : '',
            confirmed ? `<span class="chip chip-green">${svgCheck}${escHtml(tr('reservations.confirmed'))}</span>` : '',
            pending   ? `<span class="chip chip-amber">${svgClock2}${escHtml(tr('reservations.pending'))}</span>` : '',
          ].filter(Boolean).join('')

          return `
            <div class="place-card">
              <div class="place-bar" style="background:${color}"></div>
              ${thumbHtml}
              <div class="place-info">
                <div class="place-name-row">
                  <span class="place-num">${pi}</span>
                  <span class="place-name">${escHtml(place.name)}</span>
                  ${cat ? `<span class="cat-badge" style="background:${color}">${escHtml(cat.name)}</span>` : ''}
                </div>
                ${place.address ? `<div class="info-row">${svgPin}<span class="info-text">${escHtml(place.address)}</span></div>` : ''}
                ${place.description ? `<div class="info-row"><span class="info-spacer"></span><span class="info-text muted italic">${escHtml(place.description)}</span></div>` : ''}
                ${chips ? `<div class="chips">${chips}</div>` : ''}
                ${place.notes ? `<div class="info-row"><span class="info-spacer"></span><span class="info-text muted italic">${escHtml(place.notes)}</span></div>` : ''}
              </div>
            </div>`
        }).join('')

    return `
      <div class="day-section${di > 0 ? ' page-break' : ''}">
        <div class="day-header">
          <span class="day-tag">${escHtml(tr('dayplan.dayN', { n: day.day_number })).toUpperCase()}</span>
          <span class="day-title">${escHtml(day.title || `Tag ${day.day_number}`)}</span>
          ${day.date ? `<span class="day-date">${shortDate(day.date, loc)}</span>` : ''}
          ${cost ? `<span class="day-cost">${cost}</span>` : ''}
        </div>
        <div class="day-body">${itemsHtml}</div>
      </div>`
  }).join('')

  const html = `<!DOCTYPE html>
<html lang="de">
<head>
<meta charset="UTF-8">
<base href="${window.location.origin}/">
<title>${escHtml(trip?.name || tr('pdf.travelPlan'))}</title>
<link href="https://fonts.googleapis.com/css2?family=Poppins:ital,wght@0,400;0,500;0,600;0,700;1,400&display=swap" rel="stylesheet">
<style>
  *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
  body { font-family: 'Poppins', sans-serif; background: #fff; color: #1e293b; -webkit-print-color-adjust: exact; print-color-adjust: exact; }
  svg { -webkit-print-color-adjust: exact; print-color-adjust: exact; }

  /* ── Cover ─────────────────────────────────────── */
  .cover {
    width: 100%; min-height: 100vh;
    background: #0f172a;
    display: flex; flex-direction: column; justify-content: flex-end;
    padding: 52px; position: relative; overflow: hidden;
  }
  .cover-bg {
    position: absolute; inset: 0;
    background-size: cover; background-position: center;
    opacity: 0.28;
  }
  .cover-dim { position: absolute; inset: 0; background: rgba(8,12,28,0.55); }
  .cover-brand {
    position: absolute; top: 36px; right: 52px;
    font-size: 9px; font-weight: 600; letter-spacing: 2.5px;
    color: rgba(255,255,255,0.3); text-transform: uppercase;
  }
  .cover-body { position: relative; z-index: 1; }
  .cover-circle {
    width: 100px; height: 100px; border-radius: 50%;
    overflow: hidden; border: 2.5px solid rgba(255,255,255,0.25);
    margin-bottom: 26px; flex-shrink: 0;
  }
  .cover-circle img { width: 100%; height: 100%; object-fit: cover; }
  .cover-circle-ph {
    width: 100px; height: 100px; border-radius: 50%;
    background: rgba(255,255,255,0.07);
    margin-bottom: 26px;
  }
  .cover-label { font-size: 9px; font-weight: 600; letter-spacing: 2.5px; color: rgba(255,255,255,0.4); text-transform: uppercase; margin-bottom: 8px; }
  .cover-title { font-size: 42px; font-weight: 700; color: #fff; line-height: 1.1; margin-bottom: 8px; }
  .cover-desc  { font-size: 13px; color: rgba(255,255,255,0.55); line-height: 1.6; margin-bottom: 18px; max-width: 420px; }
  .cover-dates { font-size: 12px; color: rgba(255,255,255,0.45); margin-bottom: 30px; }
  .cover-line  { height: 1px; background: rgba(255,255,255,0.1); margin-bottom: 24px; }
  .cover-stats { display: flex; gap: 36px; }
  .cover-stat-num { font-size: 28px; font-weight: 700; color: #fff; line-height: 1; }
  .cover-stat-lbl { font-size: 9px; font-weight: 500; color: rgba(255,255,255,0.4); letter-spacing: 1px; margin-top: 4px; text-transform: uppercase; }

  /* ── Day ───────────────────────────────────────── */
  .page-break { page-break-before: always; }
  .day-header {
    background: #0f172a; padding: 11px 28px;
    display: flex; align-items: center; gap: 8px;
  }
  .day-tag { font-size: 8px; font-weight: 700; color: #fff; letter-spacing: 0.8px; background: rgba(255,255,255,0.12); border-radius: 4px; padding: 3px 8px; flex-shrink: 0; }
  .day-title { font-size: 13px; font-weight: 600; color: #fff; flex: 1; }
  .day-date  { font-size: 9px; color: rgba(255,255,255,0.45); }
  .day-cost  { font-size: 9px; font-weight: 600; color: rgba(255,255,255,0.65); }
  .day-body  { padding: 12px 28px 6px; }

  /* ── Place card ────────────────────────────────── */
  .place-card {
    display: flex; align-items: stretch;
    border: 1px solid #e2e8f0; border-radius: 8px;
    margin-bottom: 8px; overflow: hidden;
    background: #fff; page-break-inside: avoid;
  }
  .place-bar { width: 4px; flex-shrink: 0; }
  .place-thumb {
    width: 52px; height: 52px; object-fit: cover;
    margin: 8px; border-radius: 6px; flex-shrink: 0;
  }
  .place-thumb-fallback {
    width: 52px; height: 52px; margin: 8px; border-radius: 8px;
    flex-shrink: 0; display: flex; align-items: center; justify-content: center;
  }
  .place-thumb-fallback svg { width: 24px; height: 24px; }
  .place-info { flex: 1; padding: 9px 10px 8px 0; min-width: 0; }

  .place-name-row { display: flex; align-items: center; gap: 5px; margin-bottom: 4px; }
  .place-num {
    width: 16px; height: 16px; border-radius: 50%;
    background: #1e293b; color: #fff; font-size: 8px; font-weight: 700;
    display: flex; align-items: center; justify-content: center; flex-shrink: 0;
  }
  .place-name { font-size: 11.5px; font-weight: 600; color: #1e293b; flex: 1; }
  .cat-badge { font-size: 7.5px; font-weight: 600; color: #fff; border-radius: 99px; padding: 2px 7px; flex-shrink: 0; white-space: nowrap; }

  .info-row { display: flex; align-items: flex-start; gap: 4px; margin-bottom: 2px; padding-left: 21px; }
  .info-row svg { flex-shrink: 0; margin-top: 1px; }
  .info-spacer { width: 13px; flex-shrink: 0; }
  .info-text { font-size: 9px; color: #64748b; line-height: 1.5; }
  .info-text.muted { color: #94a3b8; }
  .info-text.italic { font-style: italic; }

  .chips { display: flex; flex-wrap: wrap; gap: 4px; padding-left: 21px; margin-top: 4px; }
  .chip { display: inline-flex; align-items: center; gap: 3px; font-size: 8px; font-weight: 600; background: #f1f5f9; color: #374151; border-radius: 99px; padding: 2px 7px; white-space: nowrap; }
  .chip svg { flex-shrink: 0; }
  .chip-green { background: #ecfdf5; color: #059669; }
  .chip-amber { background: #fffbeb; color: #d97706; }

  /* ── Note card ─────────────────────────────────── */
  .note-card {
    display: flex; align-items: center; gap: 8px;
    background: #f8fafc; border: 1px solid #e2e8f0; border-radius: 6px;
    padding: 8px 10px; margin-bottom: 7px; page-break-inside: avoid;
  }
  .note-line { width: 3px; border-radius: 99px; background: #94a3b8; align-self: stretch; flex-shrink: 0; }
  .note-icon { flex-shrink: 0; }
  .note-body { flex: 1; min-width: 0; }
  .note-text { font-size: 9.5px; color: #334155; line-height: 1.55; }
  .note-time { font-size: 8px; color: #94a3b8; margin-top: 2px; }

  .empty-day { font-size: 9.5px; color: #cbd5e1; font-style: italic; text-align: center; padding: 14px 0; }

  /* ── Print ─────────────────────────────────────── */
  @media print {
    body { margin: 0; }
    .cover { min-height: 100vh; page-break-after: always; }
    @page { margin: 0; }
  }
</style>
</head>
<body>

<!-- Cover -->
<div class="cover">
  ${coverImg ? `<div class="cover-bg" style="background-image:url('${escHtml(coverImg)}')"></div>` : ''}
  <div class="cover-dim"></div>
  <div class="cover-brand">NOMAD</div>
  <div class="cover-body">
    ${coverImg
      ? `<div class="cover-circle"><img src="${escHtml(coverImg)}" /></div>`
      : `<div class="cover-circle-ph"></div>`}
    <div class="cover-label">${escHtml(tr('pdf.travelPlan'))}</div>
    <div class="cover-title">${escHtml(trip?.name || 'Meine Reise')}</div>
    ${trip?.description ? `<div class="cover-desc">${escHtml(trip.description)}</div>` : ''}
    ${range ? `<div class="cover-dates">${range}</div>` : ''}
    <div class="cover-line"></div>
    <div class="cover-stats">
      <div>
        <div class="cover-stat-num">${sorted.length}</div>
        <div class="cover-stat-lbl">${escHtml(tr('dashboard.days'))}</div>
      </div>
      <div>
        <div class="cover-stat-num">${places?.length || 0}</div>
        <div class="cover-stat-lbl">${escHtml(tr('dashboard.places'))}</div>
      </div>
      <div>
        <div class="cover-stat-num">${totalAssigned}</div>
        <div class="cover-stat-lbl">${escHtml(tr('pdf.planned'))}</div>
      </div>
      ${totalCost > 0 ? `<div>
        <div class="cover-stat-num">${totalCost.toLocaleString('de-DE')}</div>
        <div class="cover-stat-lbl">${escHtml(tr('pdf.costLabel'))}</div>
      </div>` : ''}
    </div>
  </div>
</div>

<!-- Days -->
${daysHtml}

</body></html>`

  // Open print window
  const overlay = document.createElement('div')
  overlay.id = 'pdf-preview-overlay'
  overlay.style.cssText = 'position:fixed;inset:0;background:rgba(0,0,0,0.7);z-index:9999;display:flex;align-items:center;justify-content:center;padding:8px;'
  overlay.onclick = (e) => { if (e.target === overlay) overlay.remove() }

  const card = document.createElement('div')
  card.style.cssText = 'width:100%;max-width:1000px;height:95vh;background:var(--bg-card);border-radius:12px;overflow:hidden;display:flex;flex-direction:column;box-shadow:0 20px 60px rgba(0,0,0,0.3);'

  const header = document.createElement('div')
  header.style.cssText = 'display:flex;align-items:center;justify-content:space-between;padding:10px 16px;border-bottom:1px solid var(--border-primary);flex-shrink:0;'
  header.innerHTML = `
    <span style="font-size:13px;font-weight:600;color:var(--text-primary)">${escHtml(trip?.name || tr('pdf.travelPlan'))}</span>
    <div style="display:flex;align-items:center;gap:8px">
      <button id="pdf-print-btn" style="display:flex;align-items:center;gap:5px;font-size:12px;font-weight:500;color:var(--text-muted);background:none;border:none;cursor:pointer;padding:4px 8px;border-radius:6px;font-family:inherit">${tr('pdf.saveAsPdf')}</button>
      <button id="pdf-close-btn" style="background:none;border:none;cursor:pointer;color:var(--text-faint);display:flex;padding:4px;border-radius:6px">
        <svg width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round"><line x1="18" y1="6" x2="6" y2="18"/><line x1="6" y1="6" x2="18" y2="18"/></svg>
      </button>
    </div>
  `

  const iframe = document.createElement('iframe')
  iframe.style.cssText = 'flex:1;width:100%;border:none;'
  iframe.srcdoc = html

  card.appendChild(header)
  card.appendChild(iframe)
  overlay.appendChild(card)
  document.body.appendChild(overlay)

  header.querySelector('#pdf-close-btn').onclick = () => overlay.remove()
  header.querySelector('#pdf-print-btn').onclick = () => { iframe.contentWindow?.print() }
}