<script setup lang="ts">
import { computed, onMounted, watch } from 'vue'
import { useRouter } from 'vue-router'
import { useLecturesStore } from '@/stores/lectures'
import { useAuthStore } from '@/stores/auth'
import GlassCard from '@/components/ui/GlassCard.vue'
import StatsWidget from '@/components/ui/StatsWidget.vue'
import EmptyState from '@/components/ui/EmptyState.vue'

const lecturesStore = useLecturesStore()
const auth = useAuthStore()
const router = useRouter()

const teacherLectures = computed(() => {
  return lecturesStore.all
})
const upcoming = computed(() =>
  teacherLectures.value.filter((l) => l.status !== 'completed').slice(0, 3),
)
const enrolledTotal = computed(() =>
  teacherLectures.value.reduce((sum, l) => sum + l.enrolledSeats, 0),
)
const visibility = computed(() =>
  teacherLectures.value.length ? Math.min(100, Math.round(enrolledTotal.value * 4)) : 0,
)

function fetchTeacherLectures() {
  if (!auth.user?.id) return
  void lecturesStore.fetchLectures({ TeacherId: auth.user.id })
}

onMounted(fetchTeacherLectures)
watch(() => auth.user?.id, fetchTeacherLectures)
</script>

<template>
  <div class="teacher-dashboard page-content">
    <div class="header">
      <h1 class="page-title">Дашборд преподавателя</h1>
      <div class="actions">
        <button class="btn-primary" @click="router.push('/teacher/lectures')">Мои лекции</button>
        <button class="btn-secondary" @click="router.push('/teacher/analytics')">
          Посмотреть отзывы
        </button>
      </div>
    </div>

    <div class="stats-row">
      <StatsWidget label="Предстоящие лекции" :value="upcoming.length" icon="📅" color="green" />
      <StatsWidget label="Записавшихся" :value="enrolledTotal" icon="👥" color="aqua" />
      <StatsWidget label="Средняя оценка" :value="'—'" icon="⭐" color="orange" />
      <StatsWidget
        label="Вовлеченность вне направления"
        :value="`${visibility}%`"
        icon="🌍"
        color="purple"
      />
    </div>

    <GlassCard>
      <div class="section-title">Ближайшие лекции</div>
      <EmptyState
        v-if="!upcoming.length"
        title="Лекций пока нет"
        subtitle="После синхронизации или назначения лекции появятся здесь."
      />
      <div v-else class="upcoming">
        <div class="upcoming-item" v-for="l in upcoming" :key="l.id">
          <div>
            <div class="upcoming-title">{{ l.title }}</div>
            <div class="upcoming-meta">
              {{ new Date(l.date).toLocaleDateString('ru-RU') }} {{ l.time }}
            </div>
            <div class="upcoming-meta">Записалось {{ l.enrolledSeats }} студентов</div>
          </div>
          <button class="btn-secondary btn-sm" @click="router.push('/teacher/lectures')">
            Управлять
          </button>
        </div>
      </div>
    </GlassCard>
  </div>
</template>

<style scoped>
.teacher-dashboard {
  display: flex;
  flex-direction: column;
  gap: 18px;
}
.header {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  flex-wrap: wrap;
}
.actions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.stats-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 16px;
}
.upcoming {
  display: flex;
  flex-direction: column;
  gap: 12px;
  margin-top: 10px;
}
.upcoming-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 12px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--color-border-glass);
}
.upcoming-item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}
.upcoming-title {
  font-weight: 700;
}
.upcoming-meta {
  font-size: 13px;
  color: var(--color-text-secondary);
}
.btn-sm {
  padding: 6px 12px;
  font-size: 12px;
}
</style>
