<template>
  <div class="admin-dashboard">
    <h2>관리자 대시보드</h2>
    
    <div v-if="loading" class="loading-spinner">
      <ProgressSpinner />
    </div>
    
    <div v-else class="grid">
      <!-- 요약 카드 -->
      <div class="col-12 md:col-6 lg:col-3">
        <div class="dashboard-card">
          <div class="card-header">
            <i class="pi pi-users"></i>
            <h3>사용자</h3>
          </div>
          <div class="card-content">
            <p>총 사용자 수: {{ summary.totalUsers }}</p>
          </div>
          <div class="card-footer">
            <Button label="사용자 관리" icon="pi pi-arrow-right" @click="navigateTo('/admin/users')" />
          </div>
        </div>
      </div>
      
      <div class="col-12 md:col-6 lg:col-3">
        <div class="dashboard-card">
          <div class="card-header">
            <i class="pi pi-building"></i>
            <h3>클럽</h3>
          </div>
          <div class="card-content">
            <p>총 클럽 수: {{ summary.totalClubs }}</p>
          </div>
          <div class="card-footer">
            <Button label="클럽 관리" icon="pi pi-arrow-right" @click="navigateTo('/admin/clubs')" />
          </div>
        </div>
      </div>
      
      <div class="col-12 md:col-6 lg:col-3">
        <div class="dashboard-card">
          <div class="card-header">
            <i class="pi pi-credit-card"></i>
            <h3>구독</h3>
          </div>
          <div class="card-content">
            <p>활성 구독: {{ summary.activeSubscriptions }}</p>
          </div>
          <div class="card-footer">
            <Button label="구독 관리" icon="pi pi-arrow-right" @click="navigateTo('/admin/subscriptions')" />
          </div>
        </div>
      </div>
      
      <div class="col-12 md:col-6 lg:col-3">
        <div class="dashboard-card">
          <div class="card-header">
            <i class="pi pi-history"></i>
            <h3>활동 로그</h3>
          </div>
          <div class="card-content">
            <p>시스템 활동 기록</p>
          </div>
          <div class="card-footer">
            <Button label="활동 로그" icon="pi pi-arrow-right" @click="navigateTo('/admin/activity-logs')" />
          </div>
        </div>
      </div>

      <!-- 최근 데이터 -->
      <div class="col-12 md:col-6">
        <div class="dashboard-card">
          <div class="card-header">
            <i class="pi pi-users"></i>
            <h3>최근 가입한 사용자</h3>
          </div>
          <div class="card-content">
            <DataTable :value="recent.users" :rows="5" stripedRows>
              <Column field="name" header="이름"></Column>
              <Column field="email" header="이메일"></Column>
              <Column field="role" header="권한"></Column>
              <Column field="createdAt" header="가입일">
                <template #body="{ data }">
                  {{ formatDate(data.createdAt) }}
                </template>
              </Column>
            </DataTable>
          </div>
        </div>
      </div>

      <div class="col-12 md:col-6">
        <div class="dashboard-card">
          <div class="card-header">
            <i class="pi pi-building"></i>
            <h3>최근 생성된 클럽</h3>
          </div>
          <div class="card-content">
            <DataTable :value="recent.clubs" :rows="5" stripedRows>
              <Column field="name" header="클럽명"></Column>
              <Column field="memberCount" header="회원 수"></Column>
              <Column field="owner.name" header="모임장"></Column>
              <Column field="createdAt" header="생성일">
                <template #body="{ data }">
                  {{ formatDate(data.createdAt) }}
                </template>
              </Column>
            </DataTable>
          </div>
        </div>
      </div>

      <!-- 월별 통계 차트 -->
      <div class="col-12">
        <div class="dashboard-card">
          <div class="card-header">
            <i class="pi pi-chart-line"></i>
            <h3>월별 통계</h3>
          </div>
          <div class="card-content">
            <Chart type="line" :data="chartData" :options="chartOptions" />
          </div>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, onMounted, computed } from 'vue';
import { useRouter } from 'vue-router';
import { useToast } from 'primevue/usetoast';
import dayjs from 'dayjs';
import adminService from '@/services/adminService';

// 컴포넌트들은 main.js에서 전역으로 등록되어 있으므로 import 불필요

const router = useRouter();
const toast = useToast();

// 데이터 상태
const loading = ref(true);
const summary = ref({
  totalUsers: 0,
  totalClubs: 0,
  activeSubscriptions: 0
});
const recent = ref({
  users: [],
  clubs: [],
  subscriptions: []
});
const stats = ref({
  users: [],
  clubs: [],
  subscriptions: []
});

// 차트 데이터 계산
const chartData = computed(() => {
  const months = stats.value.users.map(item => item.month);
  
  return {
    labels: months,
    datasets: [
      {
        label: '사용자',
        data: stats.value.users.map(item => item.count),
        borderColor: '#42A5F5',
        tension: 0.4
      },
      {
        label: '클럽',
        data: stats.value.clubs.map(item => item.count),
        borderColor: '#66BB6A',
        tension: 0.4
      },
      {
        label: '구독',
        data: stats.value.subscriptions.map(item => item.count),
        borderColor: '#FFA726',
        tension: 0.4
      }
    ]
  };
});

// 차트 옵션
const chartOptions = {
  responsive: true,
  maintainAspectRatio: false,
  plugins: {
    legend: {
      position: 'top'
    }
  },
  scales: {
    y: {
      beginAtZero: true,
      ticks: {
        stepSize: 1
      }
    }
  }
};

// 컴포넌트 마운트 시 데이터 로드
onMounted(async () => {
  try {
    loading.value = true;
    await loadDashboardData();
  } catch (error) {
    console.error('관리자 대시보드 데이터 로딩 오류:', error);
  } finally {
    loading.value = false;
  }
});

// 대시보드 데이터 로드 함수
const loadDashboardData = async () => {
  try {
    const response = await adminService.getDashboardData();
    const data = response.data;
    
    summary.value = data.summary;
    recent.value = data.recent;
    stats.value = data.stats;
  } catch (error) {
    console.error('관리자 대시보드 데이터 로딩 중 오류 발생:', error);
    toast.add({ severity: 'error', summary: '오류', detail: '관리자 대시보드 데이터를 가져오는 중 오류가 발생했습니다.', life: 3000 });
  }
};

// 날짜 포맷 함수
const formatDate = (date) => {
  return dayjs(date).format('YYYY-MM-DD');
};

const navigateTo = (path) => {
  router.push(path);
};
</script>

<style scoped>
.admin-dashboard {
  padding: 1rem;
}

.loading-spinner {
  display: flex;
  justify-content: center;
  align-items: center;
  height: 200px;
}

.dashboard-card {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.1);
  padding: 1.5rem;
  height: 100%;
  display: flex;
  flex-direction: column;
  margin-bottom: 1rem;
}

.card-header {
  display: flex;
  align-items: center;
  margin-bottom: 1rem;
}

.card-header i {
  font-size: 1.5rem;
  margin-right: 0.5rem;
  color: #3B82F6;
}

.card-header h3 {
  margin: 0;
  font-size: 1.25rem;
}

.card-content {
  flex: 1;
  margin-bottom: 1rem;
}

.card-footer {
  display: flex;
  justify-content: flex-end;
}

:deep(.p-datatable) {
  box-shadow: none;
}

:deep(.p-datatable .p-datatable-thead > tr > th) {
  background-color: #f8f9fa;
}

:deep(.p-datatable .p-datatable-tbody > tr) {
  background-color: transparent;
}

@media (max-width: 600px) {
  .admin-dashboard, .header, .dashboard-card, .activity-log-container, .subscription-management-container, .user-management-container, .club-management {
    padding: 0.5rem !important;
    margin-bottom: 0.5rem !important;
  }
  .dashboard-card {
    padding: 0.7rem !important;
    font-size: 0.95rem;
  }
  .header h2, .dashboard-card h3 {
    font-size: 1.1rem !important;
  }
  .p-datatable-wrapper {
    overflow-x: auto !important;
  }
  /* Dialog 팝업 중앙 정렬 개선 */
  :deep(.p-dialog) {
    align-items: flex-start !important;
    justify-content: center !important;
    padding-top: 2.5rem !important;
  }
  :deep(.p-dialog .p-dialog-content) {
    margin-top: 0 !important;
  }
}
</style>
