<script setup lang="ts">
/**
 * @file LanguageSwitcher.vue
 * @description Language switcher component using Quasar dropdown.
 * Allows switching between Thai (th) and English (en) locales.
 */

const { locale, setLocale, locales } = useI18n()

// Get available locales with their names
const availableLocales = computed(() => {
  return (locales.value as Array<{ code: string; name: string }>).map((loc) => ({
    code: loc.code,
    name: loc.name
  }))
})

// Get flag image path for a locale
const getFlagPath = (code: string) => `/flags/${code}.png`

// Handle locale change
const changeLocale = async (code: string) => {
  await setLocale(code as 'th' | 'en')
  // Cookie is automatically handled by @nuxtjs/i18n with detectBrowserLanguage.useCookie
}
</script>

<template>
  <q-btn
    round
    flat
    class="language-btn"
    :aria-label="$t('language.label')"
  >
    <!-- Show current locale flag -->
    <img 
      :src="getFlagPath(locale)" 
      :alt="locale.toUpperCase()" 
      class="flag-icon"
    />
    
    <q-menu
      anchor="bottom right"
      self="top right"
      class="language-menu"
      :offset="[0, 8]"
    >
      <q-list style="min-width: 180px" class="py-1">
        <q-item-label 
          header 
          class="text-xs font-black uppercase tracking-wider mb-1 px-4 pt-3"
          style="color: var(--text-secondary)"
          :class="['text-slate-600', 'dark:text-slate-400']"
        >
          {{ $t('language.label') }}
        </q-item-label>
        
        <q-item
          v-for="loc in availableLocales"
          :key="loc.code"
          clickable
          v-close-popup
          @click="changeLocale(loc.code)"
          class="language-item mx-2 mb-1 rounded-lg transition-colors duration-200"
          :class="[
            locale === loc.code 
              ? 'bg-blue-50 dark:bg-blue-900/20' 
              : 'hover:bg-slate-50 dark:hover:bg-slate-800'
          ]"
        >
          <q-item-section avatar style="min-width: 0; padding-right: 12px;">
            <img 
              :src="getFlagPath(loc.code)" 
              :alt="loc.code.toUpperCase()" 
              class="flag-icon-menu"
            />
          </q-item-section>
          
          <q-item-section>
            <q-item-label 
              class="font-bold text-sm"
              :class="[
                locale === loc.code 
                  ? 'text-blue-700 dark:text-blue-300' 
                  : 'text-slate-900 dark:text-slate-100'
              ]"
            >
              {{ loc.name }}
            </q-item-label>
            <q-item-label 
              caption 
              class="text-xs font-medium mt-0.5"
              :class="[
                locale === loc.code 
                  ? 'text-blue-600/80 dark:text-blue-300/70' 
                  : 'text-slate-500 dark:text-slate-400'
              ]"
            >
              {{ loc.code.toUpperCase() }}
            </q-item-label>
          </q-item-section>
          
          <q-item-section side v-if="locale === loc.code">
            <q-icon 
              name="check" 
              size="18px"
              :class="['text-blue-700', 'dark:text-blue-300']" 
            />
          </q-item-section>
        </q-item>
      </q-list>
    </q-menu>
    
    <q-tooltip>{{ $t('language.label') }}</q-tooltip>
  </q-btn>
</template>

<style scoped>
.language-btn {
  width: 40px;
  height: 40px;
  background: #ffffff;
  border: 2px solid var(--border-color);
  transition: all 0.3s ease;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
  overflow: hidden;
  padding: 0;
}

.language-btn:hover {
  transform: scale(1.05);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.15);
  border-color: var(--primary);
}

.flag-icon {
  width: 28px;
  height: 28px;
  object-fit: cover;
  border-radius: 50%;
}

.flag-icon-menu {
  width: 28px;
  height: 20px;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 1px 3px rgba(0, 0, 0, 0.1);
}

.language-item {
  border-radius: 8px;
  margin: 4px 8px;
  transition: all 0.2s ease;
}

.language-item:hover {
  background: var(--bg-secondary);
}

.active-locale {
  background: rgba(75, 130, 247, 0.1);
}

:deep(.language-menu) {
  border-radius: 16px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
  background: var(--bg-surface);
  border: 1px solid var(--border-color);
}

:global(.dark) .language-btn {
  background: #1e293b;
  border-color: rgba(255, 255, 255, 0.15);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.3);
}

:global(.dark) .language-btn:hover {
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.4);
  border-color: var(--primary);
}

:global(.dark) :deep(.language-menu) {
  background: #1e293b;
  border-color: rgba(255, 255, 255, 0.1);
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.4);
}

:global(.dark) .active-locale {
  background: rgba(59, 130, 246, 0.2);
}
</style>
