import React from 'react'

function formatDate(value) {
  if (!value) return null

  try {
    return new Intl.DateTimeFormat('en', {
      month: 'short',
      day: 'numeric',
      year: 'numeric',
    }).format(new Date(value))
  } catch {
    return null
  }
}

function formatYear(value) {
  if (!value) return null
  try {
    return new Intl.DateTimeFormat('en', { year: 'numeric' }).format(new Date(value))
  } catch {
    return null
  }
}

function iconForType(type) {
  switch (type) {
    case 'first_upload':
      return 'fa-solid fa-seedling'
    case 'first_featured_artwork':
      return 'fa-solid fa-star'
    case 'first_group_release':
      return 'fa-solid fa-people-group'
    case 'biggest_download_spike':
      return 'fa-solid fa-bolt'
    case 'best_performing_work':
      return 'fa-solid fa-trophy'
    case 'most_productive_year':
      return 'fa-solid fa-calendar-check'
    case 'yearly_recap':
      return 'fa-solid fa-chart-column'
    // v2
    case 'comeback_minor':
      return 'fa-solid fa-rotate-right'
    case 'comeback_major':
      return 'fa-solid fa-person-walking-arrow-right'
    case 'comeback_legendary':
      return 'fa-solid fa-fire-flame-curved'
    case 'upload_streak_3':
    case 'upload_streak_6':
    case 'upload_streak_12':
      return 'fa-solid fa-fire'
    case 'active_year_streak_3':
    case 'active_year_streak_5':
      return 'fa-solid fa-calendar-days'
    case 'before_now':
      return 'fa-solid fa-arrows-rotate'
    case 'era_started':
      return 'fa-solid fa-flag'
    default:
      return 'fa-solid fa-sparkles'
  }
}

function milestoneHref(item) {
  return item?.artwork?.url || item?.release?.url || null
}

function StatPill({ label, value }) {
  if (value === null || value === undefined || value === '') return null

  return (
    <div className="rounded-2xl border border-white/10 bg-white/[0.04] px-3.5 py-2.5">
      <div className="text-[10px] font-semibold uppercase tracking-[0.24em] text-sky-200/60">{label}</div>
      <div className="mt-1 text-sm font-semibold text-white">{value}</div>
    </div>
  )
}

function EmptyJourneyState({ username, memberSinceYear, yearsOnSkinbase }) {
  return (
    <div className="rounded-[28px] border border-dashed border-white/12 bg-white/[0.03] px-6 py-12">
      <div className="flex flex-wrap items-center gap-3">
        <div className="flex h-12 w-12 items-center justify-center rounded-2xl border border-white/10 bg-white/[0.05] text-slate-200">
          <i className="fa-solid fa-route text-lg" />
        </div>
        <div>
          <div className="text-lg font-semibold text-white">Creator Journey is just getting started</div>
          <div className="mt-1 text-sm text-slate-400">
            Public milestones will appear here as @{username} builds more history on Skinbase.
          </div>
        </div>
      </div>

      <div className="mt-5 grid gap-3 sm:grid-cols-2 lg:grid-cols-3">
        <StatPill label="Member since" value={memberSinceYear || 'Unknown'} />
        <StatPill label="Years on Skinbase" value={yearsOnSkinbase ?? 0} />
        <StatPill label="Milestones saved" value="0" />
      </div>
    </div>
  )
}

// ── v2: Era strip ─────────────────────────────────────────────────────────────

const ERA_COLORS = {
  early_years:  { bg: 'bg-slate-800/60',   border: 'border-slate-600/40',   text: 'text-slate-300',   icon: 'fa-solid fa-seedling',          dot: 'bg-slate-400' },
  breakthrough: { bg: 'bg-amber-900/30',   border: 'border-amber-600/30',   text: 'text-amber-200',   icon: 'fa-solid fa-star',              dot: 'bg-amber-400' },
  experimental: { bg: 'bg-violet-900/30',  border: 'border-violet-600/30',  text: 'text-violet-200',  icon: 'fa-solid fa-flask',             dot: 'bg-violet-400' },
  comeback:     { bg: 'bg-emerald-900/30', border: 'border-emerald-600/30', text: 'text-emerald-200', icon: 'fa-solid fa-rotate-right',      dot: 'bg-emerald-400' },
  current:      { bg: 'bg-sky-900/30',     border: 'border-sky-600/30',     text: 'text-sky-200',     icon: 'fa-solid fa-bolt',             dot: 'bg-sky-400' },
}

function EraStrip({ eras }) {
  if (!eras?.length) return null

  return (
    <div className="mt-7">
      <div className="text-xs font-semibold uppercase tracking-[0.24em] text-slate-400 mb-3">Creator Eras</div>
      <div className="flex flex-wrap gap-3">
        {eras.map((era, i) => {
          const style = ERA_COLORS[era.type] ?? ERA_COLORS.current
          return (
            <div
              key={i}
              className={`flex items-start gap-3 rounded-2xl border ${style.border} ${style.bg} px-4 py-3 min-w-[180px] max-w-xs flex-1`}
            >
              <div className={`mt-0.5 flex h-8 w-8 shrink-0 items-center justify-center rounded-xl bg-white/5 ${style.text}`}>
                <i className={style.icon} />
              </div>
              <div className="min-w-0">
                <div className="flex items-center gap-2">
                  <span className={`text-sm font-semibold ${style.text}`}>{era.title}</span>
                  {era.is_current && (
                    <span className="rounded-full bg-white/10 px-2 py-0.5 text-[10px] font-semibold uppercase tracking-wider text-slate-300">
                      Now
                    </span>
                  )}
                </div>
                <div className="mt-0.5 text-[11px] text-slate-500">
                  {formatYear(era.starts_at)}
                  {era.ends_at ? ` – ${formatYear(era.ends_at)}` : era.is_current ? ' – present' : ''}
                </div>
                {era.description && (
                  <p className="mt-1.5 text-[11px] leading-relaxed text-slate-400 line-clamp-2">{era.description}</p>
                )}
                {(era.stats?.uploads_count ?? 0) > 0 && (
                  <div className="mt-2 text-[10px] text-slate-500">
                    {era.stats.uploads_count} upload{era.stats.uploads_count !== 1 ? 's' : ''}
                  </div>
                )}
              </div>
            </div>
          )
        })}
      </div>
    </div>
  )
}

// ── v2: Streaks ──────────────────────────────────────────────────────────────

function StreakBadge({ label, value, active = false }) {
  if (!value) return null
  return (
    <div className={`flex items-center gap-3 rounded-2xl border px-4 py-3 ${active ? 'border-orange-500/30 bg-orange-900/20' : 'border-white/10 bg-white/[0.03]'}`}>
      <div className={`flex h-9 w-9 shrink-0 items-center justify-center rounded-xl ${active ? 'bg-orange-500/15 text-orange-300' : 'bg-white/5 text-slate-400'}`}>
        <i className={`fa-solid fa-fire${active ? '' : ''}`} />
      </div>
      <div>
        <div className={`text-base font-bold tabular-nums ${active ? 'text-orange-200' : 'text-white'}`}>{value}</div>
        <div className="text-[11px] text-slate-500">{label}</div>
      </div>
    </div>
  )
}

function StreaksSection({ streaks }) {
  if (!streaks) return null
  const { current_monthly_upload_streak, best_monthly_upload_streak, current_active_year_streak, best_active_year_streak } = streaks
  const hasAny = current_monthly_upload_streak > 0 || best_monthly_upload_streak > 0 || best_active_year_streak > 0

  if (!hasAny) return null

  return (
    <div className="mt-7">
      <div className="text-xs font-semibold uppercase tracking-[0.24em] text-slate-400 mb-3">Creative Streaks</div>
      <div className="grid grid-cols-2 gap-3 sm:grid-cols-4">
        {current_monthly_upload_streak > 0 && (
          <StreakBadge label="Current monthly streak" value={`${current_monthly_upload_streak}mo`} active />
        )}
        {best_monthly_upload_streak > 0 && (
          <StreakBadge label="Best monthly streak" value={`${best_monthly_upload_streak}mo`} />
        )}
        {current_active_year_streak > 0 && (
          <StreakBadge label="Active year streak" value={`${current_active_year_streak}yr`} active={current_active_year_streak >= 3} />
        )}
        {best_active_year_streak > 0 && (
          <StreakBadge label="Best year streak" value={`${best_active_year_streak}yr`} />
        )}
      </div>
    </div>
  )
}

// ── v2: Growth & Evolution ───────────────────────────────────────────────────

const RELATION_LABELS = {
  remake_of:           'Remake',
  remaster_of:         'Remaster',
  revision_of:         'Revision',
  inspired_by:         'Inspired by own work',
  variation_of:        'Variation',
}

function EvolutionSection({ evolution }) {
  if (!evolution?.length) return null

  return (
    <div className="mt-7 rounded-[28px] border border-white/10 bg-white/[0.03] p-5">
      <div className="text-xs font-semibold uppercase tracking-[0.24em] text-slate-400">Growth &amp; Evolution</div>
      <div className="mt-1 text-lg font-semibold text-white">Then &amp; Now</div>

      <div className="mt-5 space-y-5">
        {evolution.map((item) => (
          <div key={item.id} className="grid gap-3 sm:grid-cols-[1fr_auto_1fr]">
            {/* Original */}
            <a
              href={item.target_artwork?.url}
              className="group flex items-start gap-3 rounded-2xl border border-white/8 bg-white/[0.03] p-3 transition-colors hover:border-white/20 hover:bg-white/[0.06]"
            >
              <div className="flex h-9 w-9 shrink-0 items-center justify-center rounded-xl bg-white/5 text-slate-500 group-hover:text-slate-300">
                <i className="fa-solid fa-image" />
              </div>
              <div className="min-w-0">
                <div className="text-[10px] font-semibold uppercase tracking-[0.2em] text-slate-600">Original</div>
                <div className="mt-0.5 truncate text-sm font-medium text-slate-300 group-hover:text-white">{item.target_artwork?.title}</div>
                <div className="text-[10px] text-slate-600">{formatYear(item.target_artwork?.published_at)}</div>
              </div>
            </a>

            {/* Arrow + relation type */}
            <div className="flex flex-col items-center justify-center gap-1 py-2 text-slate-600">
              <i className="fa-solid fa-arrow-right-long" />
              <span className="text-[10px] font-semibold uppercase tracking-wider text-slate-600">
                {RELATION_LABELS[item.relation_type] ?? item.relation_type}
              </span>
              {item.years_between > 0 && (
                <span className="text-[10px] text-slate-700">{item.years_between}yr later</span>
              )}
            </div>

            {/* New version */}
            <a
              href={item.source_artwork?.url}
              className="group flex items-start gap-3 rounded-2xl border border-emerald-700/30 bg-emerald-900/10 p-3 transition-colors hover:border-emerald-600/50 hover:bg-emerald-900/20"
            >
              <div className="flex h-9 w-9 shrink-0 items-center justify-center rounded-xl bg-emerald-500/10 text-emerald-400">
                <i className="fa-solid fa-wand-magic-sparkles" />
              </div>
              <div className="min-w-0">
                <div className="text-[10px] font-semibold uppercase tracking-[0.2em] text-emerald-600">New version</div>
                <div className="mt-0.5 truncate text-sm font-medium text-emerald-200 group-hover:text-white">{item.source_artwork?.title}</div>
                <div className="text-[10px] text-emerald-800">{formatYear(item.source_artwork?.published_at)}</div>
              </div>
            </a>
          </div>
        ))}
      </div>
    </div>
  )
}

export default function CreatorJourneySection({ journey, username }) {
  const summary = journey?.summary ?? {}
  const highlights = Array.isArray(journey?.highlights) ? journey.highlights : []
  const timeline = Array.isArray(journey?.timeline) ? journey.timeline.slice(0, 6) : []
  const recaps = Array.isArray(journey?.yearly_recaps) ? journey.yearly_recaps.slice(0, 3) : []
  const eras = Array.isArray(journey?.eras) ? journey.eras : []
  const evolution = Array.isArray(journey?.evolution) ? journey.evolution : []
  const streaks = journey?.streaks ?? null
  const latestMilestone = summary.latest_milestone ?? null
  const available = !!summary.available

  if (!available) {
    return (
      <section className="rounded-[34px] border border-white/10 bg-[linear-gradient(145deg,rgba(17,24,39,0.96),rgba(15,23,42,0.9))] p-6 shadow-[0_24px_80px_rgba(2,6,23,0.28)] sm:p-7">
        <div className="mb-5 flex flex-wrap items-center justify-between gap-4">
          <div>
            <div className="text-[11px] font-semibold uppercase tracking-[0.3em] text-sky-200/70">Creator Journey</div>
            <h2 className="mt-2 text-2xl font-semibold text-white">A profile built as a story, not only a feed</h2>
          </div>
        </div>

        <EmptyJourneyState
          username={username}
          memberSinceYear={summary.member_since_year}
          yearsOnSkinbase={summary.years_on_skinbase}
        />
      </section>
    )
  }

  return (
    <section className="rounded-[34px] border border-white/10 bg-[linear-gradient(145deg,rgba(15,23,42,0.98),rgba(8,15,28,0.92))] p-6 shadow-[0_24px_80px_rgba(2,6,23,0.32)] sm:p-7">
      <div className="flex flex-wrap items-start justify-between gap-5">
        <div className="max-w-2xl">
          <div className="text-[11px] font-semibold uppercase tracking-[0.3em] text-sky-200/70">Creator Journey</div>
          <h2 className="mt-2 text-2xl font-semibold text-white">A profile shaped by milestones, turning points, and yearly chapters.</h2>
          {latestMilestone && (
            <p className="mt-3 max-w-xl text-sm leading-relaxed text-slate-300">
              Latest moment: <span className="font-semibold text-white">{latestMilestone.title}</span>
              {latestMilestone.headline ? ` - ${latestMilestone.headline}` : ''}
            </p>
          )}
        </div>

        <div className="grid min-w-[18rem] gap-3 sm:grid-cols-3">
          <StatPill label="Member since" value={summary.member_since_year} />
          <StatPill label="Years on Skinbase" value={summary.years_on_skinbase ?? 0} />
          <StatPill label="Milestones" value={summary.milestone_count ?? 0} />
        </div>
      </div>

      {/* ── v2: Era strip ── */}
      <EraStrip eras={eras} />

      {highlights.length > 0 && (
        <div className="mt-7 grid gap-4 xl:grid-cols-2">
          {highlights.map((item) => {
            const href = milestoneHref(item)

            return (
              <article
                key={item.id}
                className="rounded-[28px] border border-white/10 bg-[linear-gradient(180deg,rgba(255,255,255,0.06),rgba(255,255,255,0.02))] p-5"
              >
                <div className="flex items-start justify-between gap-4">
                  <div className="flex min-w-0 items-start gap-3">
                    <div className="flex h-11 w-11 shrink-0 items-center justify-center rounded-2xl bg-sky-400/12 text-sky-200">
                      <i className={iconForType(item.type)} />
                    </div>
                    <div className="min-w-0">
                      <div className="text-xs font-semibold uppercase tracking-[0.22em] text-slate-400">{item.title}</div>
                      <div className="mt-1 text-lg font-semibold text-white">{item.headline || item.value}</div>
                    </div>
                  </div>
                  {item.value && (
                    <div className="rounded-full border border-white/10 bg-white/[0.04] px-3 py-1 text-xs font-medium text-slate-200">
                      {item.value}
                    </div>
                  )}
                </div>

                {item.summary && (
                  <p className="mt-4 text-sm leading-relaxed text-slate-300">{item.summary}</p>
                )}

                {href && (
                  <a
                    href={href}
                    className="mt-4 inline-flex items-center gap-2 text-sm font-medium text-sky-200 transition-colors hover:text-white"
                  >
                    Open source moment
                    <i className="fa-solid fa-arrow-up-right-from-square text-xs" />
                  </a>
                )}
              </article>
            )
          })}
        </div>
      )}

      <div className="mt-7 grid gap-6 xl:grid-cols-[minmax(0,1.35fr)_minmax(18rem,0.95fr)]">
        <div className="rounded-[28px] border border-white/10 bg-white/[0.03] p-5">
          <div className="flex items-center justify-between gap-3">
            <div>
              <div className="text-xs font-semibold uppercase tracking-[0.24em] text-slate-400">Timeline</div>
              <div className="mt-1 text-lg font-semibold text-white">Important creator milestones</div>
            </div>
          </div>

          <div className="mt-5 space-y-4">
            {timeline.map((item, index) => {
              const href = milestoneHref(item)

              return (
                <div key={item.id} className="grid grid-cols-[2.5rem_minmax(0,1fr)] gap-3">
                  <div className="flex flex-col items-center">
                    <div className="flex h-10 w-10 items-center justify-center rounded-2xl border border-white/10 bg-white/[0.05] text-slate-100">
                      <i className={iconForType(item.type)} />
                    </div>
                    {index < timeline.length - 1 && <div className="mt-2 h-full w-px bg-white/10" />}
                  </div>
                  <div className="pb-4">
                    <div className="flex flex-wrap items-center gap-2">
                      <div className="text-base font-semibold text-white">{item.title}</div>
                      {formatDate(item.occurred_at) && (
                        <div className="text-xs uppercase tracking-[0.2em] text-slate-500">{formatDate(item.occurred_at)}</div>
                      )}
                    </div>
                    {item.headline && <div className="mt-1 text-sm font-medium text-sky-100">{item.headline}</div>}
                    {item.summary && <div className="mt-1 text-sm leading-relaxed text-slate-400">{item.summary}</div>}
                    {href && (
                      <a href={href} className="mt-2 inline-flex items-center gap-2 text-sm text-slate-200 transition-colors hover:text-white">
                        View linked work
                        <i className="fa-solid fa-arrow-right text-xs" />
                      </a>
                    )}
                  </div>
                </div>
              )
            })}
          </div>
        </div>

        <div className="rounded-[28px] border border-white/10 bg-white/[0.03] p-5">
          <div>
            <div className="text-xs font-semibold uppercase tracking-[0.24em] text-slate-400">Yearly recap</div>
            <div className="mt-1 text-lg font-semibold text-white">Recent chapters</div>
          </div>

          <div className="mt-5 space-y-3">
            {recaps.map((item) => {
              const status = item.metrics?.year_status
              const statusColors = {
                breakout:     'bg-emerald-400/12 text-emerald-200',
                steady:       'bg-sky-400/12 text-sky-200',
                experimental: 'bg-violet-400/12 text-violet-200',
                comeback:     'bg-amber-400/12 text-amber-200',
                quiet:        'bg-slate-700 text-slate-400',
              }
              return (
                <article key={item.id} className="rounded-2xl border border-white/10 bg-white/[0.04] p-4">
                  <div className="flex items-center justify-between gap-3">
                    <div>
                      <div className="flex items-center gap-2">
                        <div className="text-sm font-semibold uppercase tracking-[0.2em] text-slate-400">{item.value}</div>
                        {status && (
                          <span className={`rounded-full px-2 py-0.5 text-[10px] font-semibold capitalize ${statusColors[status] ?? statusColors.steady}`}>
                            {status}
                          </span>
                        )}
                      </div>
                      <div className="mt-1 text-lg font-semibold text-white">{item.headline}</div>
                    </div>
                    <div className="flex h-11 w-11 items-center justify-center rounded-2xl bg-amber-400/12 text-amber-200">
                      <i className="fa-solid fa-chart-column" />
                    </div>
                  </div>
                  <p className="mt-3 text-sm leading-relaxed text-slate-300">{item.summary}</p>

                  <div className="mt-4 grid gap-2 sm:grid-cols-2">
                    <StatPill label="Views" value={(item.metrics?.views ?? 0).toLocaleString()} />
                    <StatPill label="Downloads" value={(item.metrics?.downloads ?? 0).toLocaleString()} />
                    {(item.metrics?.featured_count ?? 0) > 0 && (
                      <StatPill label="Featured" value={item.metrics.featured_count} />
                    )}
                    {item.metrics?.top_category && (
                      <StatPill label="Top category" value={item.metrics.top_category} />
                    )}
                  </div>
                </article>
              )
            })}
          </div>
        </div>
      </div>

      {/* ── v2: Streaks ── */}
      <StreaksSection streaks={streaks} />

      {/* ── v2: Growth & Evolution ── */}
      <EvolutionSection evolution={evolution} />
    </section>
  )
}