<script setup lang="ts">
import { onMounted, onUnmounted, computed } from 'vue'
import { useRouter } from 'vue-router'
import { useNotificationStore } from '../stores/notifications'
import { Bell, BellOff, CheckCheck, ChevronRight } from '@lucide/vue'

const store = useNotificationStore()
const router = useRouter()

const sortedNotifications = computed(() => {
  return [...store.notifications].sort(
    (a, b) => new Date(b.createdAt).getTime() - new Date(a.createdAt).getTime()
  )
})

function typeIcon(type: string): string {
  switch (type) {
    case 'task_assigned': return '👤'
    case 'task_review': return '✅'
    case 'task_blocked': return '🚫'
    default: return '🔔'
  }
}

function typeColor(type: string): string {
  switch (type) {
    case 'task_assigned': return '#4d8cf6'
    case 'task_review': return '#f6a84d'
    case 'task_blocked': return '#e16e75'
    default: return '#7b6ef2'
  }
}

function timeAgo(dateStr: string): string {
  const now = Date.now()
  const then = new Date(dateStr).getTime()
  const diffSec = Math.floor((now - then) / 1000)
  if (diffSec < 60) return 'vor ' + diffSec + ' Sek'
  const diffMin = Math.floor(diffSec / 60)
  if (diffMin < 60) return 'vor ' + diffMin + ' Min'
  const diffHr = Math.floor(diffMin / 60)
  if (diffHr < 24) return 'vor ' + diffHr + ' Std'
  const diffDay = Math.floor(diffHr / 24)
  return 'vor ' + diffDay + ' Tag' + (diffDay > 1 ? 'en' : '')
}

function onNotificationClick(n: { id: string, taskId: string | null }) {
  if (n.taskId) {
    router.push('/tasks')
  }
  store.markAsRead(n.id)
}

onMounted(() => {
  store.startListPolling()
})

onUnmounted(() => {
  store.stopListPolling()
})
</script>

<template>
  <div class="notifications-page">
    <div class="page-header">
      <h1>
        <Bell :size="22" />
        Benachrichtigungen
      </h1>
      <button
        v-if="store.unreadCount > 0"
        class="mark-all-btn"
        @click="store.markAllAsRead()"
      >
        <CheckCheck :size="15" />
        Alle als gelesen markieren
      </button>
    </div>

    <div v-if="sortedNotifications.length === 0" class="empty-state">
      <BellOff :size="48" />
      <p>Keine Benachrichtigungen</p>
    </div>

    <div v-else class="notification-list">
      <div
        v-for="n in sortedNotifications"
        :key="n.id"
        :class="['notification-card', { unread: !n.isRead }]"
        @click="onNotificationClick(n)"
      >
        <div class="icon-wrapper" :style="{ background: typeColor(n.type) + '20' }">
          <span class="type-icon">{{ typeIcon(n.type) }}</span>
        </div>
        <div class="card-body">
          <div :class="['card-title', { bold: !n.isRead }]">{{ n.title }}</div>
          <div v-if="n.message" class="card-message">{{ n.message }}</div>
        </div>
        <div class="card-meta">
          <span class="timestamp">{{ timeAgo(n.createdAt) }}</span>
          <ChevronRight v-if="n.taskId" :size="14" class="arrow" />
        </div>
      </div>
    </div>
  </div>
</template>

<style scoped>
.notifications-page {
  max-width: 720px;
  margin: 0 auto;
  padding: 24px;
}

.page-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 24px;
  gap: 12px;
}

.page-header h1 {
  margin: 0;
  font-size: 20px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.mark-all-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border: 1px solid var(--nx-line, #1f2330);
  border-radius: 6px;
  background: transparent;
  color: var(--nx-text-dim, #6f7889);
  font-size: 10.5px;
  cursor: pointer;
  transition: background .15s, color .15s;
}

.mark-all-btn:hover {
  background: var(--nx-accent-soft, rgba(123, 110, 242, .08));
  color: #d8dbe3;
}

/* ── Empty State ── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 80px 0;
  color: var(--nx-text-dim, #6f7889);
  gap: 16px;
}

.empty-state p {
  font-size: 14px;
  margin: 0;
}

/* ── Notification List ── */
.notification-list {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.notification-card {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 12px 14px;
  border-radius: 8px;
  cursor: pointer;
  transition: background .15s;
  border: 1px solid transparent;
}

.notification-card:hover {
  background: var(--nx-accent-soft, rgba(123, 110, 242, .06));
}

.notification-card.unread {
  background: rgba(77, 140, 246, .06);
  border-color: rgba(77, 140, 246, .12);
}

.icon-wrapper {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  display: grid;
  place-items: center;
  flex-shrink: 0;
}

.type-icon {
  font-size: 16px;
  line-height: 1;
}

.card-body {
  flex: 1;
  min-width: 0;
}

.card-title {
  font-size: 12.5px;
  color: #d8dbe3;
  line-height: 1.4;
}

.card-title.bold {
  font-weight: 700;
  color: #fff;
}

.card-message {
  font-size: 10.5px;
  color: var(--nx-text-dim, #6f7889);
  margin-top: 3px;
  line-height: 1.3;
}

.card-meta {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  gap: 4px;
  flex-shrink: 0;
  min-width: 60px;
}

.timestamp {
  font-size: 9px;
  color: var(--nx-text-dim, #6f7889);
  white-space: nowrap;
}

.arrow {
  color: var(--nx-text-dim, #6f7889);
  opacity: .5;
}
</style>
