<template>
  <div>
    <BreadcrumbBar :segments="[]" :show-root="false" class="mb-4" />

    <h2 class="text-2xl font-semibold text-gray-900 mb-6">Overview</h2>

    <div v-if="loading" class="text-gray-500">Loading overview…</div>

    <div v-else-if="error" class="text-red-600">{{ error }}</div>

    <template v-else-if="overview">
      <div class="grid grid-cols-1 md:grid-cols-4 gap-4 mb-8">
        <div class="bg-white border border-gray-200 rounded-xl p-6">
          <p class="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-1">Users</p>
          <p class="text-2xl font-bold text-gray-900">{{ overview.user_count }}</p>
        </div>

        <div class="bg-white border border-gray-200 rounded-xl p-6">
          <p class="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-1">Storage</p>
          <p class="text-2xl font-bold text-gray-900">{{ formatSize(overview.total_storage_bytes) }}</p>
        </div>

        <div class="bg-white border border-gray-200 rounded-xl p-6">
          <p class="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-1">Processing</p>
          <p class="text-2xl font-bold text-gray-900">{{ overview.doc_status?.processing ?? 0 }}</p>
        </div>

        <div class="bg-white border border-gray-200 rounded-xl p-6">
          <p class="text-xs font-semibold text-gray-400 uppercase tracking-wider mb-1">Ready</p>
          <p class="text-2xl font-bold text-gray-900">{{ overview.doc_status?.ready ?? 0 }}</p>
        </div>
      </div>

      <div>
        <h3 class="text-sm font-semibold text-gray-700 mb-3">Recent Activity</h3>

        <div v-if="overview.recent_audit && overview.recent_audit.length === 0" class="text-sm text-gray-400 italic">
          No recent activity
        </div>

        <div v-else class="bg-white rounded-xl border border-gray-200 overflow-hidden">
          <table class="w-full text-sm border-collapse">
            <thead>
              <tr class="bg-gray-50 border-b border-gray-200">
                <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">When</th>
                <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">Event</th>
                <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">Actor</th>
                <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">Target</th>
                <th scope="col" class="px-4 py-3 text-left text-xs font-semibold text-gray-400 uppercase tracking-wider">IP</th>
              </tr>
            </thead>
            <tbody>
              <tr
                v-for="entry in overview.recent_audit"
                :key="entry.id"
                class="border-b border-gray-100 hover:bg-gray-50 transition-colors"
              >
                <td class="px-4 py-3 font-mono text-xs text-gray-500">{{ formatDate(entry.created_at) }}</td>
                <td class="px-4 py-3 text-sm text-gray-700">{{ entry.event_type }}</td>
                <td class="px-4 py-3 text-sm text-gray-700">{{ entry.owner_handle ?? '—' }}</td>
                <td class="px-4 py-3 text-sm text-gray-500">{{ entry.target_user_handle ?? '—' }}</td>
                <td class="px-4 py-3 font-mono text-xs text-gray-700">{{ entry.ip_address ?? '—' }}</td>
              </tr>
            </tbody>
          </table>
        </div>
      </div>
    </template>
  </div>
</template>

<script setup>
import { ref, onMounted } from 'vue'
import { getAdminOverview } from '../../api/admin.js'
import { formatSize, formatDate } from '../../utils/formatters.js'
import BreadcrumbBar from '../../components/ui/BreadcrumbBar.vue'

const loading = ref(false)
const error = ref(null)
const overview = ref(null)

onMounted(async () => {
  loading.value = true
  try {
    overview.value = await getAdminOverview()
  } catch (e) {
    error.value = e?.message || 'Failed to load overview'
  } finally {
    loading.value = false
  }
})
</script>
