'use client'

import { useState, useEffect, useMemo } from 'react'
import ProductCard from './ProductCard'
import WelcomeModal from './WelcomeModal'
import GuidedTour from './GuidedTour'
import type { CatalogItem } from '@/data/mock-catalog'

interface ActiveOccasion {
  key:                string
  label:              string
  emoji:              string
  blurb:              string
  squareCategorySlug?: string
}

export default function FeaturedProducts() {
  const [items,           setItems]           = useState<CatalogItem[]>([])
  const [activeOccasions, setActiveOccasions] = useState<ActiveOccasion[]>([])
  const [catOrder,        setCatOrder]        = useState<string[]>([])
  const [catHidden,       setCatHidden]       = useState<string[]>([])
  const [loading,         setLoading]         = useState(true)
  const [error,           setError]           = useState(false)

  const [category, setCategory] = useState<string>('all')
  const [search, setSearch] = useState('')
  const [searchOpen, setSearchOpen] = useState(false)

  const [showWelcome, setShowWelcome] = useState(false)
  const [showTour,    setShowTour]    = useState(false)

  // Show welcome modal once per browser (after products load so tour targets exist)
  useEffect(() => {
    if (!loading && !localStorage.getItem('bpb_seen_welcome')) {
      setShowWelcome(true)
    }
  }, [loading])

  const dismissWelcome = () => {
    localStorage.setItem('bpb_seen_welcome', '1')
    setShowWelcome(false)
  }

  const startTour = () => {
    localStorage.setItem('bpb_seen_welcome', '1')
    setShowWelcome(false)
    setShowTour(true)
  }

  const tourInit = () => {
    setCategory('all')
    setSearch('')
    setSearchOpen(false)
  }

  const endTour = () => {
    setShowTour(false)
    // Close any customization modal that may have been opened during the tour
    window.dispatchEvent(new KeyboardEvent('keydown', { key: 'Escape', bubbles: true }))
  }

  const productCategories = useMemo(() => {
    const seen = new Map<string, string>()
    items.forEach((item) => {
      const cats   = item.categories   ?? [item.category]
      const labels = item.categoryLabels ?? [item.categoryLabel]
      cats.forEach((slug, i) => {
        if (!seen.has(slug)) seen.set(slug, labels[i] ?? slug)
      })
    })
    const all = Array.from(seen.entries()).map(([key, label]) => ({ key, label }))
    const visible = all.filter((c) => !catHidden.includes(c.key))
    visible.sort((a, b) => {
      const ai = catOrder.indexOf(a.key)
      const bi = catOrder.indexOf(b.key)
      if (ai === -1 && bi === -1) return 0
      if (ai === -1) return 1
      if (bi === -1) return -1
      return ai - bi
    })
    return visible
  }, [items, catOrder, catHidden])

  const tabs = useMemo(() => {
    // Category slugs already represented by an occasion tab — hide them from the regular tabs
    const occasionSlugs = new Set(activeOccasions.map((o) => o.squareCategorySlug).filter(Boolean) as string[])
    return [
      ...activeOccasions.map((o) => ({ key: o.key, label: `${o.emoji} ${o.label}`, occasion: true })),
      { key: 'all', label: 'All', occasion: false },
      ...productCategories.filter((c) => !occasionSlugs.has(c.key)).map((c) => ({ ...c, occasion: false })),
    ]
  }, [activeOccasions, productCategories])

  const activeOccasion: ActiveOccasion | undefined = useMemo(
    () => activeOccasions.find((o) => o.key === category),
    [activeOccasions, category]
  )

  useEffect(() => {
    Promise.all([
      fetch('/api/catalog').then((r) => { if (!r.ok) throw new Error('catalog error'); return r.json() }),
      fetch('/api/inventory').then((r) => r.ok ? r.json() : { counts: {} }).catch(() => ({ counts: {} })),
      fetch('/api/occasions').then((r) => r.ok ? r.json() : { occasions: [] }).catch(() => ({ occasions: [] })),
      fetch('/api/categories-display').then((r) => r.ok ? r.json() : { order: [], hidden: [] }).catch(() => ({ order: [], hidden: [] })),
    ])
      .then(([{ items }, { counts }, { occasions }, catDisplay]: [
        { items: CatalogItem[] },
        { counts: Record<string, number> },
        { occasions: ActiveOccasion[] },
        { order: string[]; hidden: string[] },
      ]) => {
        const withInventory = items.map((item) => ({
          ...item,
          variations: item.variations.map((v) =>
            v.id in counts ? { ...v, inventory: counts[v.id] } : v
          ),
        }))
        setItems(withInventory)
        setActiveOccasions(occasions)
        setCatOrder(catDisplay.order ?? [])
        setCatHidden(catDisplay.hidden ?? [])
        if (occasions.length > 0) setCategory(occasions[0].key)
        setLoading(false)
      })
      .catch(() => { setError(true); setLoading(false) })
  }, [])

  const q = search.trim().toLowerCase()

  const filtered = (activeOccasion
    ? activeOccasion.squareCategorySlug
      ? items.filter((i) => (i.categories ?? [i.category]).includes(activeOccasion.squareCategorySlug!))
      : items
    : category === 'all'
      ? items
      : items.filter((i) => (i.categories ?? [i.category]).includes(category))
  ).filter((i) =>
    !q || i.name.toLowerCase().includes(q) || i.description.toLowerCase().includes(q)
  )

  return (
    <section className="section shop-section">
      <div className="container">

        {/* Section header */}
        <div className="has-text-centered mb-5" style={{ position: 'relative', paddingLeft: '36px', paddingRight: '36px' }}>
          <h2 className="is-size-3">Shop</h2>
          <p className="is-size-6 has-text-grey">
            Choose an arrangement, pick your colors, and place your order.
          </p>
          {/* Persistent tour button */}
          <button
            onClick={startTour}
            title="How does this work?"
            aria-label="How does this work?"
            style={{
              position:     'absolute',
              right:        0,
              top:          0,
              width:        '28px',
              height:       '28px',
              borderRadius: '50%',
              border:       '1.5px solid #ccc',
              background:   '#fff',
              color:        '#888',
              fontSize:     '0.8rem',
              fontWeight:   700,
              cursor:       'pointer',
              lineHeight:   1,
              display:      'flex',
              alignItems:   'center',
              justifyContent: 'center',
            }}
          >
            ?
          </button>
        </div>

        {/* Category tabs + search */}
        <div data-tour="tabs" style={{ display: 'flex', alignItems: 'center', gap: '0.75rem', marginBottom: '0.5rem', flexWrap: 'wrap' }}>
          <div className="tabs is-centered" style={{ flex: 1, marginBottom: 0 }}>
            <ul>
              {tabs.map(({ key, label, occasion }) => (
                <li key={occasion ? `occ-${key}` : `cat-${key}`} className={category === key ? 'is-active' : ''}>
                  <a onClick={() => { setCategory(key); setSearch(''); setSearchOpen(false) }}>{label}</a>
                </li>
              ))}
            </ul>
          </div>
          <div style={{ flexShrink: 0, display: 'flex', alignItems: 'center' }}>
            {searchOpen ? (
              <div className="control has-icons-left" style={{ display: 'flex', alignItems: 'center', gap: '6px' }}>
                <input
                  className="input is-small"
                  type="search"
                  placeholder="Search…"
                  value={search}
                  autoFocus
                  onChange={(e) => { setSearch(e.target.value); if (e.target.value) setCategory('all') }}
                  onBlur={() => { if (!search) setSearchOpen(false) }}
                  onKeyDown={(e) => { if (e.key === 'Escape') { setSearch(''); setSearchOpen(false) } }}
                  style={{ width: '160px' }}
                />
                <span className="icon is-small is-left">
                  <svg xmlns="http://www.w3.org/2000/svg" width="14" height="14" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round"><circle cx="11" cy="11" r="8"/><line x1="21" y1="21" x2="16.65" y2="16.65"/></svg>
                </span>
              </div>
            ) : (
              <button
                onClick={() => setSearchOpen(true)}
                aria-label="Search"
                style={{ background: 'none', border: 'none', cursor: 'pointer', color: '#555', padding: '4px', lineHeight: 1, display: 'flex' }}
              >
                <svg xmlns="http://www.w3.org/2000/svg" width="18" height="18" viewBox="0 0 24 24" fill="none" stroke="currentColor" strokeWidth="2.5" strokeLinecap="round" strokeLinejoin="round"><circle cx="11" cy="11" r="8"/><line x1="21" y1="21" x2="16.65" y2="16.65"/></svg>
              </button>
            )}
          </div>
        </div>

        {/* Holiday/occasion banner */}
        {activeOccasion && (
          <div style={{
            background:    'linear-gradient(135deg, #11b3be 0%, #7585ff 100%)',
            borderRadius:  '12px',
            padding:       '1rem 1.5rem',
            marginBottom:  '1.5rem',
            textAlign:     'center',
            color:         '#fff',
          }}>
            <span style={{ fontSize: '1.5rem' }}>{activeOccasion.emoji}</span>
            <p style={{ fontWeight: 'bold', fontSize: '1rem', margin: '0.25rem 0 0.1rem' }}>
              {activeOccasion.label}
            </p>
            <p style={{ fontSize: '0.85rem', opacity: 0.9 }}>{activeOccasion.blurb}</p>
          </div>
        )}

        {/* Welcome modal + guided tour */}
        {showWelcome && <WelcomeModal onTour={startTour} onDismiss={dismissWelcome} />}
        {showTour    && <GuidedTour onDone={endTour} onStart={tourInit} />}

        {/* Product grid */}
        {loading ? (
          <SkeletonGrid />
        ) : error ? (
          <p className="has-text-centered has-text-danger py-6">
            Unable to load products right now. Please try again shortly.
          </p>
        ) : filtered.length === 0 ? (
          <p className="has-text-centered has-text-grey py-6">
            {q
              ? `No results for "${search}".`
              : activeOccasion
                ? `Our ${activeOccasion.label} collection is coming soon — check back shortly!`
                : 'No products in this category yet.'
            }
          </p>
        ) : (
          <div className="columns is-multiline is-centered">
            {filtered.map((item, index) => (
              <div
                key={item.id}
                className="column is-3-desktop is-6-tablet is-12-mobile"
                {...(index === 0 ? { 'data-tour': 'first-card' } : {})}
              >
                <ProductCard item={item} />
              </div>
            ))}
          </div>
        )}
      </div>
    </section>
  )
}

function SkeletonGrid() {
  return (
    <div className="columns is-multiline is-centered">
      {Array.from({ length: 8 }).map((_, i) => (
        <div key={i} className="column is-3-desktop is-6-tablet is-12-mobile">
          <div className="product-card">
            <div className="skeleton-block" style={{ height: '220px' }} />
            <div className="card-content" style={{ gap: '0.75rem', display: 'flex', flexDirection: 'column' }}>
              <div className="skeleton-block" style={{ height: '1.2rem', width: '60%' }} />
              <div className="skeleton-block" style={{ height: '1rem', width: '30%' }} />
              <div className="skeleton-block" style={{ height: '0.85rem', width: '90%' }} />
              <div className="skeleton-block" style={{ height: '0.85rem', width: '75%' }} />
            </div>
          </div>
        </div>
      ))}
    </div>
  )
}