import { defineStore } from 'pinia'
import { ref, computed, watch } from 'vue'
import { db } from 'src/db'
import { startAutoSync, getToken } from 'src/services/syncService'

// Color interpolation
function lerpColor(a, b, t) {
  const ar = parseInt(a.slice(1, 3), 16)
  const ag = parseInt(a.slice(3, 5), 16)
  const ab = parseInt(a.slice(5, 7), 16)
  const br = parseInt(b.slice(1, 3), 16)
  const bg = parseInt(b.slice(3, 5), 16)
  const bb = parseInt(b.slice(5, 7), 16)
  const r = Math.round(ar + (br - ar) * t)
  const g = Math.round(ag + (bg - ag) * t)
  const blue = Math.round(ab + (bb - ab) * t)
  return `#${r.toString(16).padStart(2, '0')}${g.toString(16).padStart(2, '0')}${blue.toString(16).padStart(2, '0')}`
}

// Gradient presets: [negative, neutral, positive]
const GRADIENT_PRESETS = [
  { name: 'Standard', colors: ['#E91E63', '#FFD700', '#4CAF50'] },
  { name: 'Sunset', colors: ['#FD1D1D', '#FCB045', '#833AB4'] },
  { name: 'Earth', colors: ['#ED8153', '#ED8153', '#217B9E'] },
  { name: 'Ocean', colors: ['#00D4FF', '#164173', '#440559'] },
  { name: 'Spring', colors: ['#FDBB2D', '#96BE74', '#22C1C3'] },
  { name: 'Neon', colors: ['#FC466B', '#9A52B6', '#3F5EFB'] },
  { name: 'Pastel', colors: ['#EEAECA', '#C2B4D9', '#94BBE9'] },
  { name: 'Aurora', colors: ['#FF6B6B', '#C084FC', '#67E8F9'] },
  { name: 'Forest', colors: ['#DC2626', '#A3A830', '#059669'] },
  { name: 'Berry', colors: ['#F472B6', '#FB923C', '#A78BFA'] }
]

// Glow color logic: emotion value → color, with optional gradient preset
function emotionToColor(emotion, gradientIdx = null) {
  const preset = gradientIdx !== null ? GRADIENT_PRESETS[gradientIdx] : null
  if (preset) {
    const [neg, mid, pos] = preset.colors
    if (emotion >= 0) {
      return lerpColor(mid, pos, emotion)
    } else {
      return lerpColor(mid, neg, Math.abs(emotion))
    }
  }
  if (emotion >= 0) {
    if (emotion < 0.5) {
      return lerpColor('#FF6B35', '#FFD700', emotion / 0.5)
    }
    return lerpColor('#FFD700', '#4CAF50', (emotion - 0.5) / 0.5)
  } else {
    const abs = Math.abs(emotion)
    if (abs < 0.5) {
      return lerpColor('#2196F3', '#9C27B0', abs / 0.5)
    }
    return lerpColor('#9C27B0', '#E91E63', (abs - 0.5) / 0.5)
  }
}

// Demo seed data
const demoEvents = [
  { id: crypto.randomUUID(), title: 'Erster Schultag', date: '1995-09-01', emotion: 0.6, customColor: null, gradientPreset: null, image: null, note: '', syncStatus: 'local', createdAt: Date.now(), updatedAt: Date.now() },
  { id: crypto.randomUUID(), title: 'Abiball', date: '2004-06-25', emotion: 0.85, customColor: null, gradientPreset: 1, image: 'demo/photo-1530103862676-de8c9debad1d.jpeg', note: 'Was für eine Party!', syncStatus: 'local', createdAt: Date.now(), updatedAt: Date.now() },
  { id: crypto.randomUUID(), title: 'Trennung', date: '2010-03-15', emotion: -0.7, customColor: null, gradientPreset: null, image: null, note: '', syncStatus: 'local', createdAt: Date.now(), updatedAt: Date.now() },
  { id: crypto.randomUUID(), title: 'Bergwanderung', date: '2014-08-12', emotion: 0.75, customColor: null, gradientPreset: 4, image: 'demo/photo-1534067783941-51c9c23ecefd.jpeg', note: 'Unvergesslicher Ausblick', syncStatus: 'local', createdAt: Date.now(), updatedAt: Date.now() },
  { id: crypto.randomUUID(), title: 'Jobverlust', date: '2016-11-03', emotion: -0.6, customColor: null, gradientPreset: null, image: null, note: '', syncStatus: 'local', createdAt: Date.now(), updatedAt: Date.now() },
  { id: crypto.randomUUID(), title: 'Hochzeit', date: '2018-07-20', emotion: 0.95, customColor: null, gradientPreset: 5, image: 'demo/photo-1506905925346-21bda4d32df4.jpeg', note: 'Der schönste Tag', syncStatus: 'local', createdAt: Date.now(), updatedAt: Date.now() },
  { id: crypto.randomUUID(), title: 'Umzug', date: '2021-04-01', emotion: -0.3, customColor: null, gradientPreset: null, image: null, note: '', syncStatus: 'local', createdAt: Date.now(), updatedAt: Date.now() },
  { id: crypto.randomUUID(), title: 'Neuer Job', date: '2023-01-10', emotion: 0.5, customColor: null, gradientPreset: null, image: 'demo/photo-1530103862676-de8c9debad1d.jpeg', note: 'Neues Kapitel', syncStatus: 'local', createdAt: Date.now(), updatedAt: Date.now() }
]

// Generate realistic demo events for testing at scale
function generateManyEvents(count = 500) {
  // Realistic life event categories with emotion ranges
  const categories = [
    // Positive events
    { titles: ['Geburtstag', 'Geburtstagsfeier', 'Überraschungsparty'], emotionRange: [0.3, 0.8], noteChance: 0.4, notes: ['Tolles Fest!', 'Viele Geschenke', 'Schöner Tag mit Freunden', 'Alles Gute!'] },
    { titles: ['Urlaub', 'Strandurlaub', 'Städtereise', 'Roadtrip', 'Backpacking'], emotionRange: [0.4, 0.95], noteChance: 0.6, notes: ['Unvergesslich', 'Wunderschöne Landschaft', 'Endlich Erholung', 'Muss ich wiederholen'] },
    { titles: ['Hochzeit', 'Verlobung', 'Jahrestag'], emotionRange: [0.7, 1.0], noteChance: 0.8, notes: ['Der schönste Tag', 'Für immer', 'Tränen der Freude', 'Unbeschreiblich'] },
    { titles: ['Beförderung', 'Neuer Job', 'Gehaltserhöhung', 'Jobangebot'], emotionRange: [0.5, 0.9], noteChance: 0.5, notes: ['Endlich!', 'Harte Arbeit zahlt sich aus', 'Neues Kapitel', 'Verdient'] },
    { titles: ['Konzert', 'Festival', 'Theaterbesuch', 'Oper'], emotionRange: [0.3, 0.85], noteChance: 0.5, notes: ['Gänsehaut', 'Beste Band ever', 'Geniale Atmosphäre', 'Nächstes Jahr wieder'] },
    { titles: ['Geburt', 'Baby da!', 'Nachwuchs'], emotionRange: [0.85, 1.0], noteChance: 0.9, notes: ['Das größte Wunder', 'Willkommen auf der Welt', 'Unbeschreibliches Glück'] },
    { titles: ['Abschluss', 'Prüfung bestanden', 'Diplom', 'Master geschafft'], emotionRange: [0.6, 0.95], noteChance: 0.6, notes: ['Geschafft!', 'Jahre harter Arbeit', 'Stolz', 'Endlich vorbei'] },
    { titles: ['Bergwanderung', 'Gipfel erreicht', 'Marathon geschafft', 'Triathlon'], emotionRange: [0.5, 0.9], noteChance: 0.5, notes: ['Was für ein Ausblick!', 'Körperliche Grenzen überwunden', 'Nie aufgeben'] },
    { titles: ['Hauskauf', 'Wohnungseinweihung', 'Renovierung fertig'], emotionRange: [0.4, 0.8], noteChance: 0.5, notes: ['Endlich eigene vier Wände', 'Traum wird wahr', 'Viel Arbeit, aber es lohnt sich'] },
    { titles: ['Erstes Date', 'Zusammengekommen', 'Liebeserklärung'], emotionRange: [0.5, 0.95], noteChance: 0.6, notes: ['Schmetterlinge', 'Liebe auf den ersten Blick', 'Endlich getraut'] },
    // Neutral events
    { titles: ['Umzug', 'Neue Stadt', 'Wohnungswechsel'], emotionRange: [-0.2, 0.3], noteChance: 0.4, notes: ['Neuanfang', 'Alles anders', 'Spannend und stressig zugleich'] },
    { titles: ['Arztbesuch', 'Vorsorge', 'Check-up'], emotionRange: [-0.1, 0.1], noteChance: 0.2, notes: ['Alles okay', 'Routine'] },
    { titles: ['Meeting', 'Präsentation', 'Workshop'], emotionRange: [-0.1, 0.4], noteChance: 0.3, notes: ['Gut gelaufen', 'Viel gelernt', 'Anstrengend'] },
    { titles: ['Friseur', 'Shopping', 'Einkauf'], emotionRange: [0.0, 0.3], noteChance: 0.1, notes: ['Neuer Look', 'Guter Fund'] },
    // Negative events
    { titles: ['Trennung', 'Beziehungsende', 'Scheidung'], emotionRange: [-1.0, -0.5], noteChance: 0.5, notes: ['Schmerzhaft', 'Warum?', 'Es ist besser so', 'Brauche Zeit'] },
    { titles: ['Jobverlust', 'Kündigung', 'Firma pleite'], emotionRange: [-0.9, -0.4], noteChance: 0.5, notes: ['Schock', 'Wie geht es weiter?', 'Unverdient'] },
    { titles: ['Krankheit', 'OP', 'Krankenhaus'], emotionRange: [-0.8, -0.3], noteChance: 0.6, notes: ['Wird schon', 'Hauptsache gesund werden', 'Lange Genesung'] },
    { titles: ['Abschied', 'Verlust', 'Trauer'], emotionRange: [-1.0, -0.6], noteChance: 0.7, notes: ['Ruhe in Frieden', 'Fehlt mir', 'Unvergessen', 'Schwerer Tag'] },
    { titles: ['Streit', 'Konflikt', 'Auseinandersetzung'], emotionRange: [-0.7, -0.2], noteChance: 0.3, notes: ['Muss nicht sein', 'Hoffe auf Klärung'] },
    { titles: ['Unfall', 'Panne', 'Autopanne'], emotionRange: [-0.6, -0.2], noteChance: 0.4, notes: ['Zum Glück nichts Schlimmes', 'Ärgerlich', 'Hätte schlimmer sein können'] },
    { titles: ['Prüfung nicht bestanden', 'Absage', 'Ablehnung'], emotionRange: [-0.7, -0.3], noteChance: 0.4, notes: ['Nächstes Mal', 'Nicht aufgeben', 'Enttäuschend'] },
  ]

  const demoImages = [
    'demo/photo-1530103862676-de8c9debad1d.jpeg',
    'demo/photo-1534067783941-51c9c23ecefd.jpeg',
    'demo/photo-1506905925346-21bda4d32df4.jpeg'
  ]

  // Seeded random for reproducibility
  let seed = 42
  function rand() {
    seed = (seed * 16807 + 0) % 2147483647
    return (seed - 1) / 2147483646
  }

  function randInt(min, max) {
    return Math.floor(rand() * (max - min + 1)) + min
  }

  function pick(arr) {
    return arr[Math.floor(rand() * arr.length)]
  }

  function randFloat(min, max) {
    return Math.round((min + rand() * (max - min)) * 100) / 100
  }

  const evts = []
  const startYear = 1985
  const endYear = 2026

  // Generate events with realistic distribution (more events in recent years)
  for (let i = 0; i < count; i++) {
    // Weight towards recent years: cube root distribution
    const t = rand()
    const yearFloat = startYear + (endYear - startYear) * (t * t * 0.4 + t * 0.6)
    const year = Math.floor(yearFloat)
    const month = randInt(1, 12)
    const day = randInt(1, 28) // safe for all months
    const date = `${year}-${String(month).padStart(2, '0')}-${String(day).padStart(2, '0')}`

    const cat = pick(categories)
    const title = pick(cat.titles)
    const emotion = randFloat(cat.emotionRange[0], cat.emotionRange[1])
    const hasNote = rand() < cat.noteChance
    const note = hasNote ? pick(cat.notes) : ''
    const hasImage = rand() < 0.15 // 15% chance
    const image = hasImage ? pick(demoImages) : null
    const hasPreset = rand() < 0.25 // 25% chance
    const gradientPreset = hasPreset ? randInt(0, 9) : null

    evts.push({
      id: crypto.randomUUID(),
      title,
      date,
      emotion,
      customColor: null,
      gradientPreset,
      image,
      note,
      syncStatus: 'local',
      createdAt: Date.now(),
      updatedAt: Date.now()
    })
  }

  // Sort by date
  evts.sort((a, b) => a.date.localeCompare(b.date))
  return evts
}

export { emotionToColor, GRADIENT_PRESETS, demoEvents, generateManyEvents }

export const useEventsStore = defineStore('events', () => {
  const events = ref([])
  const isLoaded = ref(false)
  const selectedEventId = ref(null)
  const panelOpen = ref(false)
  const editingEventId = ref(null)

  // Load events from IndexedDB; seed demo data on first launch
  async function init() {
    try {
      let stored = await db.events.orderBy('date').toArray()
      if (stored.length === 0) {
        const seed = generateManyEvents(500)
        await db.events.bulkPut(seed)
        stored = seed
      }
      events.value = stored
    } catch (e) {
      console.warn('Dexie load failed, using demo data:', e)
      events.value = [...demoEvents]
    }
    isLoaded.value = true

    // Start auto-sync if authenticated
    getToken().then((token) => {
      if (token) startAutoSync()
    })
  }

  // Fire-and-forget DB write (UI already updated via ref)
  function dbPut(event) {
    db.events.put(event).catch(e => console.warn('Dexie put failed:', e))
  }

  function dbDelete(id) {
    db.events.delete(id).catch(e => console.warn('Dexie delete failed:', e))
  }

  function dbQueueSync(eventId, action, payload) {
    db.syncQueue.add({ eventId, action, payload, createdAt: Date.now() })
      .catch(e => console.warn('Dexie sync queue failed:', e))
  }

  // Ghost event for live preview while creating/editing
  const ghostEmotion = ref(0)
  const ghostCustomColor = ref(null)
  const ghostGradientPreset = ref(null)
  const ghostTitle = ref('')
  const ghostDate = ref(new Date().toISOString().slice(0, 10))
  const ghostNote = ref('')
  const ghostImage = ref(null)

  const ghostEvent = computed(() => ({
    id: '__ghost__',
    title: ghostTitle.value || 'New Event',
    date: ghostDate.value,
    emotion: ghostEmotion.value,
    customColor: ghostCustomColor.value,
    gradientPreset: ghostGradientPreset.value,
    image: ghostImage.value,
    note: ghostNote.value
  }))

  const sortedEvents = computed(() => {
    return [...events.value].sort((a, b) => new Date(a.date) - new Date(b.date))
  })

  function selectEvent(id) {
    selectedEventId.value = id
  }

  function openPanel(eventId = null) {
    if (eventId) {
      editingEventId.value = eventId
      const event = events.value.find((e) => e.id === eventId)
      if (event) {
        ghostTitle.value = event.title
        ghostDate.value = event.date
        ghostEmotion.value = event.emotion
        ghostCustomColor.value = event.customColor
        ghostGradientPreset.value = event.gradientPreset ?? null
        ghostImage.value = event.image || null
        ghostNote.value = event.note
      }
    } else {
      editingEventId.value = null
      ghostTitle.value = ''
      ghostDate.value = new Date().toISOString().slice(0, 10)
      ghostEmotion.value = 0
      ghostCustomColor.value = null
      ghostGradientPreset.value = null
      ghostImage.value = null
      ghostNote.value = ''
    }
    panelOpen.value = true
  }

  // Auto-save: persist ghost → event in edit mode
  function persistToEvent() {
    if (!editingEventId.value) return
    const idx = events.value.findIndex((e) => e.id === editingEventId.value)
    if (idx === -1) return
    const updated = {
      ...events.value[idx],
      title: ghostTitle.value,
      date: ghostDate.value,
      emotion: ghostEmotion.value,
      customColor: ghostCustomColor.value,
      gradientPreset: ghostGradientPreset.value,
      image: ghostImage.value,
      note: ghostNote.value,
      syncStatus: 'modified',
      updatedAt: Date.now()
    }
    events.value[idx] = updated
    dbPut(updated)
  }

  watch(
    [ghostTitle, ghostDate, ghostEmotion, ghostCustomColor, ghostGradientPreset, ghostImage, ghostNote],
    () => { persistToEvent() }
  )

  function closePanel() {
    if (!editingEventId.value && ghostTitle.value.trim()) {
      const newEvent = {
        id: crypto.randomUUID(),
        title: ghostTitle.value,
        date: ghostDate.value,
        emotion: ghostEmotion.value,
        customColor: ghostCustomColor.value,
        gradientPreset: ghostGradientPreset.value,
        image: ghostImage.value,
        note: ghostNote.value,
        syncStatus: 'local',
        createdAt: Date.now(),
        updatedAt: Date.now()
      }
      events.value.push(newEvent)
      dbPut(newEvent)
      dbQueueSync(newEvent.id, 'create', { ...newEvent })
    }
    panelOpen.value = false
    editingEventId.value = null
    selectedEventId.value = null
  }

  function deleteEvent(id) {
    events.value = events.value.filter((e) => e.id !== id)
    dbDelete(id)
    dbQueueSync(id, 'delete', null)
    closePanel()
  }

  function getGlowColor(event) {
    if (event.customColor) return event.customColor
    return emotionToColor(event.emotion, event.gradientPreset ?? null)
  }

  // Auto-init on store creation
  init()

  return {
    events,
    isLoaded,
    selectedEventId,
    panelOpen,
    editingEventId,
    ghostEmotion,
    ghostCustomColor,
    ghostGradientPreset,
    ghostTitle,
    ghostDate,
    ghostNote,
    ghostImage,
    ghostEvent,
    sortedEvents,
    selectEvent,
    openPanel,
    closePanel,
    deleteEvent,
    getGlowColor
  }
})