<script setup lang="ts">
import { ref, onMounted } from 'vue'
import { useApi } from '@/composables/useApi'
import { useRouter } from 'vue-router'
import { Key, KeyRound, Users, DollarSign, Server, UserPlus, ArrowRight, ScrollText, CreditCard, MonitorCog } from 'lucide-vue-next'
import { safeCurrency, safeLocaleString } from '@/utils/formatters'

const api = useApi()
const router = useRouter()

interface PlatformStats {
  total_licenses: number
  active_licenses: number
  total_users: number
  module_mrr: number
  servers_online: number
  new_signups_this_week: number
}

const stats = ref<PlatformStats | null>(null)
const isLoading = ref(false)

const kpiCards = [
  { key: 'total_licenses' as const, label: 'Total Licenses', icon: Key, format: 'number' },
  { key: 'active_licenses' as const, label: 'Active Licenses', icon: KeyRound, format: 'number' },
  { key: 'total_users' as const, label: 'Total Users', icon: Users, format: 'number' },
  { key: 'module_mrr' as const, label: 'Module MRR', icon: DollarSign, format: 'currency' },
  { key: 'servers_online' as const, label: 'Servers Online', icon: Server, format: 'number' },
  { key: 'new_signups_this_week' as const, label: 'New Signups This Week', icon: UserPlus, format: 'number' },
]

const quickLinks = [
  { label: 'Licenses', description: 'Manage license keys and activations', icon: Key, route: '/admin/licenses' },
  { label: 'Subscriptions', description: 'View module subscriptions and MRR', icon: CreditCard, route: '/admin/subscriptions' },
  { label: 'Users', description: 'Manage platform users and permissions', icon: Users, route: '/admin/users' },
  { label: 'Servers', description: 'Monitor connected game servers', icon: MonitorCog, route: '/admin/servers' },
]

function formatValue(value: number | undefined, format: string): string {
  if (format === 'currency') {
    return safeCurrency(value, '$', '\u2014')
  }
  return safeLocaleString(value, '\u2014')
}

async function fetchStats() {
  isLoading.value = true
  try {
    stats.value = await api.get<PlatformStats>('/admin/stats')
  } catch {
    // API not wired yet
  } finally {
    isLoading.value = false
  }
}

onMounted(() => {
  fetchStats()
})
</script>

<template>
  <div class="p-6 space-y-8 bg-neutral-950 min-h-screen">
    <!-- Header -->
    <div>
      <div class="flex items-center gap-3 mb-1">
        <ScrollText class="w-6 h-6 text-oxide-500" />
        <h1 class="text-2xl font-bold text-neutral-100">Platform Admin</h1>
      </div>
      <p class="text-sm text-neutral-400 ml-9">Overview of all platform activity and key metrics.</p>
    </div>

    <!-- KPI Cards -->
    <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-3 gap-4">
      <div
        v-for="card in kpiCards"
        :key="card.key"
        class="bg-neutral-900 border border-neutral-800 rounded-lg p-5"
      >
        <div class="flex items-center gap-3 mb-3">
          <div class="p-2 rounded-lg bg-oxide-500/10">
            <component :is="card.icon" class="w-4 h-4 text-oxide-400" />
          </div>
          <p class="text-sm text-neutral-400">{{ card.label }}</p>
        </div>
        <!-- Loading state -->
        <div v-if="isLoading" class="h-8 w-24 bg-neutral-800 rounded animate-pulse" />
        <!-- Value -->
        <p v-else class="text-3xl font-bold text-neutral-100">
          {{ stats ? formatValue(stats[card.key], card.format) : '\u2014' }}
        </p>
      </div>
    </div>

    <!-- Quick Links -->
    <div>
      <h2 class="text-lg font-semibold text-neutral-200 mb-4">Quick Links</h2>
      <div class="grid grid-cols-1 sm:grid-cols-2 lg:grid-cols-4 gap-4">
        <button
          v-for="link in quickLinks"
          :key="link.route"
          @click="router.push(link.route)"
          class="bg-neutral-900 border border-neutral-800 rounded-lg p-5 text-left hover:border-oxide-500/40 hover:bg-neutral-800/50 transition-all group"
        >
          <div class="flex items-center justify-between mb-2">
            <div class="p-2 rounded-lg bg-oxide-500/10">
              <component :is="link.icon" class="w-4 h-4 text-oxide-400" />
            </div>
            <ArrowRight class="w-4 h-4 text-neutral-600 group-hover:text-oxide-400 transition-colors" />
          </div>
          <p class="text-sm font-semibold text-neutral-100 mt-3">{{ link.label }}</p>
          <p class="text-xs text-neutral-500 mt-1">{{ link.description }}</p>
        </button>
      </div>
    </div>
  </div>
</template>
