'use client'

import { useState, useEffect } from 'react'
import { updateAISettings } from '@/app/actions/ai-settings'
import { updateUserSettings } from '@/app/actions/user-settings'
import { useLanguage } from '@/lib/i18n'
import { toast } from 'sonner'
import { Palette, Type, LayoutGrid, Maximize } from 'lucide-react'
import { applyDocumentTheme, normalizeThemeId, type ThemeId } from '@/lib/apply-document-theme'
import {
  NOTES_LAYOUT_STORAGE_KEY,
  parseNotesLayoutMode,
  setNotesLayoutPreference,
} from '@/lib/notes-view-preference'
import { isClassicLayoutMode, type NotesClassicLayoutMode } from '@/components/notes-list-views'
import { motion } from 'motion/react'

const PRESET_COLORS = [
  { name: 'Warm Earth', value: '#A47148' },
  { name: 'Sage', value: '#4E594A' },
  { name: 'Terracotta', value: '#B1523E' },
  { name: 'Iron', value: '#4A5568' },
  { name: 'Charcoal', value: '#1E293B' },
  { name: 'Slate', value: '#475569' },
  { name: 'Olive', value: '#7C8363' },
  { name: 'Wine', value: '#722F37' },
]

interface AppearanceSettingsClientProps {
  initialFontSize: string
  initialTheme: string
  initialFontFamily?: string
  initialAccentColor?: string
}

export function AppearanceSettingsClient({
  initialFontSize,
  initialTheme,
  initialFontFamily = 'inter',
  initialAccentColor = '#A47148',
}: AppearanceSettingsClientProps) {
  const { t } = useLanguage()
  const [theme, setTheme] = useState<ThemeId>(normalizeThemeId(initialTheme || 'light'))
  const [fontSize, setFontSize] = useState(initialFontSize || 'medium')
  const [fontFamily, setFontFamily] = useState(initialFontFamily)
  const [accentColor, setAccentColor] = useState(initialAccentColor)
  const [notesLayout, setNotesLayout] = useState<NotesClassicLayoutMode>('list')

  useEffect(() => {
    const stored = parseNotesLayoutMode(localStorage.getItem(NOTES_LAYOUT_STORAGE_KEY))
    setNotesLayout(isClassicLayoutMode(stored) ? stored : 'list')
  }, [])

  useEffect(() => {
    document.documentElement.style.setProperty('--color-brand-accent', accentColor)
  }, [accentColor])

  const handleAccentColorChange = async (color: string) => {
    setAccentColor(color)
    document.documentElement.style.setProperty('--color-brand-accent', color)
    localStorage.setItem('accent-color', color)
    await updateUserSettings({ accentColor: color })
  }

  const handleThemeChange = async (value: string) => {
    const next = normalizeThemeId(value)
    setTheme(next)
    localStorage.setItem('theme-preference', next)
    applyDocumentTheme(next)
    await updateUserSettings({ theme: next })
    toast.success(t('settings.settingsSaved'))
  }

  const handleFontSizeChange = async (value: string) => {
    setFontSize(value)
    const map: Record<string, string> = { small: '14px', medium: '16px', large: '18px', 'extra-large': '20px' }
    document.documentElement.style.setProperty('--user-font-size', map[value] || '16px')
    await updateAISettings({ fontSize: value as any })
    toast.success(t('settings.settingsSaved'))
  }

  const handleFontFamilyChange = async (value: string) => {
    const font = value === 'system' ? 'system'
      : value === 'playfair' ? 'playfair'
      : value === 'jetbrains' ? 'jetbrains'
      : 'inter'
    setFontFamily(font)
    localStorage.setItem('font-family', font)
    const root = document.documentElement
    root.classList.remove('font-system', 'font-playfair', 'font-jetbrains')
    if (font === 'system') root.classList.add('font-system')
    if (font === 'playfair') root.classList.add('font-playfair')
    if (font === 'jetbrains') root.classList.add('font-jetbrains')
    await updateAISettings({ fontFamily: font as 'inter' | 'playfair' | 'jetbrains' | 'system' })
    toast.success(t('settings.settingsSaved'))
  }

  const handleNotesLayoutChange = (value: string) => {
    const layout = value === 'grid' ? 'grid' : value === 'table' ? 'table' : 'list'
    setNotesLayout(layout)
    setNotesLayoutPreference(layout)
    window.dispatchEvent(new CustomEvent('memento-notes-layout-change', { detail: { layout } }))
    toast.success(t('settings.settingsSaved'))
  }

  const SelectCard = ({
    icon: Icon,
    title,
    description,
    value,
    options,
    onChange,
    optionGroups,
  }: {
    icon: React.ElementType
    title: string
    description: string
    value: string
    options?: { value: string; label: string }[]
    optionGroups?: { label: string; options: { value: string; label: string }[] }[]
    onChange: (v: string) => void
  }) => (
    <div className="bg-white/40 dark:bg-white/5 border border-border rounded-2xl p-8 space-y-8 group transition-all duration-300 hover:shadow-xl hover:shadow-slate/5">
      <div className="flex items-center gap-5">
        <div className="p-3 bg-paper dark:bg-white/10 rounded-2xl text-slate border border-border group-hover:scale-110 transition-transform duration-300">
          <Icon className="h-5 w-5" />
        </div>
        <div className="space-y-0.5 text-left">
          <h4 className="text-base font-bold text-foreground">{title}</h4>
          <p className="text-[11px] text-muted-foreground leading-tight">{description}</p>
        </div>
      </div>
      <div className="relative group/select">
        <select
          value={value}
          onChange={(e) => onChange(e.target.value)}
          className="w-full bg-white/50 dark:bg-black/40 border border-border rounded-xl px-5 py-4 text-sm outline-none focus:ring-1 ring-slate/20 appearance-none cursor-pointer text-foreground font-bold transition-all hover:bg-white dark:hover:bg-black/60"
        >
          {optionGroups
            ? optionGroups.map((g) => (
                <optgroup key={g.label} label={g.label}>
                  {g.options.map((o) => (
                    <option key={o.value} value={o.value}>
                      {o.label}
                    </option>
                  ))}
                </optgroup>
              ))
            : options?.map((o) => (
                <option key={o.value} value={o.value}>
                  {o.label}
                </option>
              ))}
        </select>
        <div className="absolute right-5 top-1/2 -translate-y-1/2 pointer-events-none text-muted-foreground group-hover/select:text-foreground transition-colors">
          <svg width="10" height="6" viewBox="0 0 10 6" fill="none">
            <path d="M1 1L5 5L9 1" stroke="currentColor" strokeWidth="1.5" strokeLinecap="round" strokeLinejoin="round"/>
          </svg>
        </div>
      </div>
    </div>
  )

  const themeOptionGroups = [
    {
      label: t('settings.themeBaseGroup'),
      options: [
        { value: 'light', label: t('settings.themeLight') },
        { value: 'dark', label: t('settings.themeDark') },
        { value: 'auto', label: t('settings.themeSystem') },
      ],
    },
    {
      label: t('settings.themePalettesGroup'),
      options: [
        { value: 'sepia', label: t('settings.themeSepia') },
        { value: 'midnight', label: t('settings.themeMidnight') },
        { value: 'rose', label: t('settings.themeRose') },
        { value: 'green', label: t('settings.themeGreen') },
        { value: 'lavender', label: t('settings.themeLavender') },
        { value: 'sand', label: t('settings.themeSand') },
        { value: 'ocean', label: t('settings.themeOcean') },
        { value: 'sunset', label: t('settings.themeSunset') },
        { value: 'blue', label: t('settings.themeBlue') },
      ],
    },
  ]

  return (
    <motion.div
      initial={{ opacity: 0, y: 10 }}
      animate={{ opacity: 1, y: 0 }}
      className="space-y-16 pb-20"
    >
      <div className="space-y-10">
        <p className="text-[11px] font-bold uppercase tracking-[0.2em] text-muted-foreground">
          {t('appearance.description')}
        </p>

        <div className="grid grid-cols-1 md:grid-cols-2 gap-8">
          {/* Accent Color Section */}
          <div className="md:col-span-2 bg-white/40 dark:bg-white/5 border border-border rounded-3xl p-10 space-y-8 group transition-all duration-300 hover:shadow-xl hover:shadow-brand-accent/5">
            <div className="flex items-center justify-between">
              <div className="flex items-center gap-5">
                <div className="p-3 bg-paper dark:bg-white/10 rounded-2xl border border-border group-hover:scale-110 transition-transform duration-300 shadow-sm" style={{ color: accentColor }}>
                  <Palette size={20} />
                </div>
                <div className="space-y-0.5 text-left">
                  <h4 className="text-base font-bold text-foreground">{t('appearance.accentColorTitle')}</h4>
                  <p className="text-[11px] text-muted-foreground leading-tight">{t('appearance.accentColorDescription')}</p>
                </div>
              </div>
              <div className="flex items-center gap-3 bg-slate-50 dark:bg-black/20 px-4 py-2 rounded-xl border border-border/40">
                <div className="w-4 h-4 rounded-full border border-border/60" style={{ backgroundColor: accentColor }} />
                <span className="text-xs font-mono font-medium text-muted-foreground uppercase tracking-widest">{accentColor}</span>
              </div>
            </div>

            <div className="flex flex-wrap gap-4">
              {PRESET_COLORS.map((color) => (
                <button
                  key={color.value}
                  onClick={() => handleAccentColorChange(color.value)}
                  className={`relative w-12 h-12 rounded-2xl transition-all duration-300 hover:scale-110 flex items-center justify-center p-1 border-2 ${
                    accentColor.toLowerCase() === color.value.toLowerCase()
                      ? 'border-foreground shadow-lg'
                      : 'border-transparent hover:border-muted-foreground/20'
                  }`}
                  title={color.name}
                >
                  <div
                    className="w-full h-full rounded-xl shadow-inner"
                    style={{ backgroundColor: color.value }}
                  />
                  {accentColor.toLowerCase() === color.value.toLowerCase() && (
                    <motion.div
                      layoutId="color-check"
                      className="absolute inset-0 flex items-center justify-center text-white mix-blend-difference"
                    >
                      <Palette size={14} />
                    </motion.div>
                  )}
                </button>
              ))}

              <div className="h-12 w-px bg-border/40 mx-2" />

              <div className="relative group/custom">
                <input
                  type="color"
                  value={accentColor}
                  onChange={(e) => handleAccentColorChange(e.target.value)}
                  className="w-12 h-12 rounded-2xl cursor-pointer opacity-0 absolute inset-0 z-10"
                />
                <div className="w-12 h-12 rounded-2xl border-2 border-dashed border-muted-foreground/30 flex items-center justify-center text-muted-foreground transition-all group-hover/custom:border-foreground group-hover/custom:text-foreground">
                  <Maximize size={16} />
                </div>
              </div>
            </div>
          </div>

          <SelectCard
            icon={Palette}
            title={t('settings.theme')}
            description={t('appearance.selectTheme')}
            value={theme}
            optionGroups={themeOptionGroups}
            onChange={handleThemeChange}
          />

          <SelectCard
            icon={Type}
            title={t('profile.fontSize')}
            description={t('profile.fontSizeDescription')}
            value={fontSize}
            options={[
              { value: 'small', label: t('profile.fontSizeSmall') },
              { value: 'medium', label: t('profile.fontSizeMedium') },
              { value: 'large', label: t('profile.fontSizeLarge') },
              { value: 'extra-large', label: t('profile.fontSizeExtraLarge') },
            ]}
            onChange={handleFontSizeChange}
          />

          <SelectCard
            icon={Type}
            title={t('appearance.fontFamilyLabel')}
            description={t('appearance.fontFamilyDescription')}
            value={fontFamily}
            options={[
              { value: 'inter', label: t('appearance.fontInterDefault') },
              { value: 'playfair', label: t('appearance.fontPlayfairDisplay') },
              { value: 'jetbrains', label: t('appearance.fontJetBrainsMono') },
              { value: 'system', label: t('appearance.fontSystem') },
            ]}
            onChange={handleFontFamilyChange}
          />

          <SelectCard
            icon={LayoutGrid}
            title={t('settings.notesViewLabel')}
            description={t('settings.notesViewDescription')}
            value={notesLayout === 'grid' ? 'masonry' : notesLayout === 'table' ? 'table' : 'list'}
            options={[
              { value: 'masonry', label: t('settings.notesViewMasonry') },
              { value: 'list', label: t('settings.notesViewList') },
              { value: 'table', label: t('settings.notesViewTable') },
            ]}
            onChange={(v) => handleNotesLayoutChange(v === 'masonry' ? 'grid' : v === 'table' ? 'table' : 'list')}
          />
        </div>
      </div>
    </motion.div>
  )
}