<script setup lang="ts">
/**
 * @file home.vue
 * @description หน้าแดชบอร์ดหลัก (Dashboard)
 * แสดงข้อความต้อนรับ และคอร์สแนะนำสำหรับผู้เรียน
 */

definePageMeta({
  layout: 'default',
  middleware: 'auth'
})

useHead({
  title: 'Dashboard - e-Learning'
})

const { currentUser } = useAuth()
const { fetchCourses } = useCourse() // Import useCourse
const { fetchCategories } = useCategory() // Import useCategory

// Helper to get localized text
const getLocalizedText = (text: string | { th: string; en: string } | undefined) => {
  if (!text) return ''
  if (typeof text === 'string') return text
  return text.th || text.en || ''
}

// Recommended Courses State
// เก็บข้อมูลคอร์สแนะนำ (สุ่มมา 3 คอร์ส)
const recommendedCourses = ref<any[]>([])

onMounted(async () => {
  // 1. Fetch Categories for mapping
  // ดึงหมวดหมู่เพื่อเอามาแสดงชื่อหมวดหมู่ในการ์ด
  const catRes = await fetchCategories()
  const catMap = new Map()
  if (catRes.success) {
    catRes.data?.forEach((c: any) => catMap.set(c.id, c.name))
  }

  // 2. Fetch All Courses and Randomize
  // ดึงคอร์สทั้งหมดและสุ่มเลือกมา 3 อัน
  const res = await fetchCourses()
  if (res.success && res.data?.length) {
    // Shuffle array (สุ่มลำดับ)
    const shuffled = [...res.data].sort(() => 0.5 - Math.random())
    
    // Pick first 3 (เลือกมา 3 อันแรก)
    recommendedCourses.value = shuffled.slice(0, 3).map((c: any) => ({
      id: c.id,
      title: getLocalizedText(c.title),
      category: getLocalizedText(catMap.get(c.category_id)) || 'General', // Map Category ID to Name
      duration: c.lessons ? `${c.lessons} บทเรียน` : 'พร้อมเรียน', // Use lesson count or default
      image: c.thumbnail_url || '',
      badge: '', // No mock badge
      badgeType: '' 
    }))
  }
})
</script>

<template>
  <div class="dashboard-container py-8 px-4">
    <!-- Welcome Header Section -->
    <div class="welcome-section mb-10 overflow-hidden relative rounded-[2.5rem] p-10 md:p-14 text-white shadow-lg dark:shadow-2xl dark:shadow-blue-900/20 transition-all">
      <div class="relative z-10 flex flex-col md:flex-row justify-between items-center gap-8">
        <div>
          <h1 class="text-4xl md:text-5xl font-black mb-3 slide-up tracking-tight text-white dark:text-white">{{ $t('dashboard.welcomeTitle') }}, {{ currentUser?.firstName }}!</h1>
          <p class="text-lg slide-up font-medium text-blue-100" style="animation-delay: 0.1s;">{{ $t('dashboard.welcomeSubtitle') }}</p>
        </div>
        <div class="stats-mini flex gap-6 slide-up" style="animation-delay: 0.2s;"/>
      </div>
      <!-- Decorative Background elements -->
      <div class="absolute inset-0 bg-gradient-to-br from-blue-500 via-blue-600 to-indigo-700 dark:from-blue-600 dark:via-blue-700 dark:to-indigo-900 -z-0"/>
      <div class="absolute -top-20 -right-20 w-80 h-80 bg-white/10 blur-[100px] rounded-full"/>
      <div class="absolute -bottom-20 -left-20 w-80 h-80 bg-blue-400/20 blur-[100px] rounded-full"/>
    </div>

      <!-- Main Content Area -->
      <div class="lg:col-span-12">
        <!-- Section: Recommended Courses -->
        <div class="mb-8">
           <h2 class="text-2xl font-black flex items-center gap-3 tracking-tight text-slate-900 dark:text-white">
            <span class="w-1.5 h-8 bg-emerald-500 rounded-full shadow-[0_0_15px_rgba(16,185,129,0.5)]"/>
            {{ $t('menu.recommendedCourses') }}
          </h2>
        </div>
        
        <!-- Recommended Grid -->
        <div class="grid grid-cols-1 md:grid-cols-2 lg:grid-cols-3 gap-8">
           <NuxtLink v-for="(course, idx) in recommendedCourses" :key="course.id" :to="`/course/${course.id}`" class="p-0 overflow-hidden group border border-slate-200 dark:border-white/5 rounded-3xl shadow-sm dark:shadow-xl transition-all hover:-translate-y-1 dark:hover:-translate-y-1 block" style="background-color: var(--bg-surface);">
              <div class="h-48 overflow-hidden relative rounded-t-3xl">
                 <img v-if="course.image" :src="course.image" :alt="course.title" class="w-full h-full object-cover group-hover:scale-110 transition-transform duration-700" >
                 <div class="absolute inset-x-0 bottom-0 h-1/2 bg-gradient-to-t from-slate-900/20 dark:from-[#1e293b] to-transparent"/>
              </div>
              <div class="p-7" style="background-color: var(--bg-surface);">
                 <div class="text-[10px] font-black text-slate-700 dark:text-slate-500 uppercase tracking-[0.2em] mb-2">{{ course.category }}</div>
                 <h4 class="font-black text-xl mb-6 text-slate-900 dark:text-white group-hover:text-blue-700 dark:group-hover:text-blue-400 transition-colors line-clamp-2">{{ course.title }}</h4>
                 <div class="flex items-center justify-between">
                    <span class="text-xs font-bold text-slate-700 dark:text-slate-400 flex items-center gap-2">
                      <svg xmlns="http://www.w3.org/2000/svg" class="h-4 w-4 text-slate-600 dark:text-slate-500" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M12 8v4l3 3m6-3a9 9 0 11-18 0 9 9 0 0118 0z" /></svg>
                      {{ course.duration }}
                    </span>
                     <span class="px-4 py-2 bg-blue-600 text-white text-xs font-bold rounded-lg hover:bg-blue-700 transition-colors shadow-md">{{ $t('menu.viewDetails') }}</span>
                 </div>
              </div>
           </NuxtLink>
        </div>
        
        <!-- Loading State for Recommended -->
        <div v-if="recommendedCourses.length === 0" class="flex justify-center py-10 opacity-50">
           <div class="animate-pulse">Loading recommendations...</div>
        </div>
      </div>
  </div>
</template>

<style scoped>
.dashboard-container {
  max-width: 1400px;
  margin: 0 auto;
}

.card-premium {
  background: #ffffff;
  border-radius: 2.5rem;
  transition: all 0.4s cubic-bezier(0.34, 1.56, 0.64, 1);
  box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
}

.card-premium:hover {
  transform: translateY(-6px);
  box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.15);
}

:global(.dark) .card-premium {
  background: #1e293b;
  box-shadow: 0 20px 50px -12px rgba(0, 0, 0, 0.5);
}

:global(.dark) .card-premium:hover {
  box-shadow: 0 30px 60px -12px rgba(0, 0, 0, 0.6);
}

:global(.app-main) {
  background-color: #ffffff;
  color: #1e293b;
  transition: background-color 0.2s, color 0.2s;
}

:global(.dark) :global(.app-main) {
  background-color: #0f172a;
  color: #f1f5f9;
}

.glass-bright {
  background: rgba(255, 255, 255, 0.08);
  backdrop-filter: blur(20px);
}

@keyframes slide-up {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

.slide-up {
  animation: slide-up 0.8s cubic-bezier(0.2, 0.8, 0.2, 1) forwards;
  opacity: 0;
}

.status-pill {
   @apply px-4 py-1.5 rounded-full font-black uppercase tracking-widest border;
}
.status-success {
   @apply bg-emerald-500/10 text-emerald-400 border-emerald-500/30;
}
.status-warning {
   @apply bg-amber-500/10 text-amber-400 border-amber-500/30;
}

:global(.app-main) {
  background-color: #ffffff;
  color: #1e293b;
  min-height: 100vh;
  transition: background-color 0.2s, color 0.2s;
}

:global(.dark) :global(.app-main) {
  background-color: #0f172a;
  color: #f1f5f9;
}
</style>
