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<template>
  <div
    v-if="show"
    class="fixed inset-0 z-50 h-full w-full overflow-y-auto bg-gray-600 bg-opacity-50"
  >
    <div class="relative top-10 mx-auto w-4/5 max-w-4xl rounded-md border bg-white p-5 shadow-lg">
      <div class="mt-3">
        <div class="mb-6 flex items-center justify-between">
          <div>
            <h3 class="text-lg font-medium text-gray-900">
              Usage Statistics - {{ user?.displayName || user?.username }}
            </h3>
            <p class="text-sm text-gray-500">@{{ user?.username }}{{ user?.role }}</p>
          </div>
          <button class="text-gray-400 hover:text-gray-600" @click="emit('close')">
            <svg class="h-6 w-6" fill="none" stroke="currentColor" viewBox="0 0 24 24">
              <path
                d="M6 18L18 6M6 6l12 12"
                stroke-linecap="round"
                stroke-linejoin="round"
                stroke-width="2"
              />
            </svg>
          </button>
        </div>

        <!-- Period Selector -->
        <div class="mb-6">
          <select
            v-model="selectedPeriod"
            class="block w-32 rounded-md border-gray-300 shadow-sm focus:border-blue-500 focus:ring-blue-500 sm:text-sm"
            @change="loadUsageStats"
          >
            <option value="day">Last 24 Hours</option>
            <option value="week">Last 7 Days</option>
            <option value="month">Last 30 Days</option>
            <option value="quarter">Last 90 Days</option>
          </select>
        </div>

        <!-- Loading State -->
        <div v-if="loading" class="py-12 text-center">
          <svg
            class="mx-auto h-8 w-8 animate-spin text-blue-600"
            fill="none"
            viewBox="0 0 24 24"
            xmlns="http://www.w3.org/2000/svg"
          >
            <circle
              class="opacity-25"
              cx="12"
              cy="12"
              r="10"
              stroke="currentColor"
              stroke-width="4"
            ></circle>
            <path
              class="opacity-75"
              d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4zm2 5.291A7.962 7.962 0 014 12H0c0 3.042 1.135 5.824 3 7.938l3-2.647z"
              fill="currentColor"
            ></path>
          </svg>
          <p class="mt-2 text-sm text-gray-500">Loading usage statistics...</p>
        </div>

        <!-- Stats Content -->
        <div v-else class="space-y-6">
          <!-- Summary Cards -->
          <div class="grid grid-cols-1 gap-4 md:grid-cols-2 lg:grid-cols-4">
            <div class="overflow-hidden rounded-lg bg-blue-50 shadow">
              <div class="p-5">
                <div class="flex items-center">
                  <div class="flex-shrink-0">
                    <svg
                      class="h-6 w-6 text-blue-600"
                      fill="none"
                      stroke="currentColor"
                      viewBox="0 0 24 24"
                    >
                      <path
                        d="M13 10V3L4 14h7v7l9-11h-7z"
                        stroke-linecap="round"
                        stroke-linejoin="round"
                        stroke-width="2"
                      />
                    </svg>
                  </div>
                  <div class="ml-5 w-0 flex-1">
                    <dl>
                      <dt class="truncate text-sm font-medium text-blue-600">Requests</dt>
                      <dd class="text-lg font-medium text-blue-900">
                        {{ formatNumber(usageStats?.totalRequests || 0) }}
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>

            <div class="overflow-hidden rounded-lg bg-green-50 shadow">
              <div class="p-5">
                <div class="flex items-center">
                  <div class="flex-shrink-0">
                    <svg
                      class="h-6 w-6 text-green-600"
                      fill="none"
                      stroke="currentColor"
                      viewBox="0 0 24 24"
                    >
                      <path
                        d="M7 7h.01M7 3h5c.512 0 1.024.195 1.414.586l7 7a2 2 0 010 2.828l-7 7a2 2 0 01-2.828 0l-7-7A1.994 1.994 0 013 12V7a4 4 0 014-4z"
                        stroke-linecap="round"
                        stroke-linejoin="round"
                        stroke-width="2"
                      />
                    </svg>
                  </div>
                  <div class="ml-5 w-0 flex-1">
                    <dl>
                      <dt class="truncate text-sm font-medium text-green-600">Input Tokens</dt>
                      <dd class="text-lg font-medium text-green-900">
                        {{ formatNumber(usageStats?.totalInputTokens || 0) }}
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>

            <div class="overflow-hidden rounded-lg bg-purple-50 shadow">
              <div class="p-5">
                <div class="flex items-center">
                  <div class="flex-shrink-0">
                    <svg
                      class="h-6 w-6 text-purple-600"
                      fill="none"
                      stroke="currentColor"
                      viewBox="0 0 24 24"
                    >
                      <path
                        d="M7 7h.01M7 3h5c.512 0 1.024.195 1.414.586l7 7a2 2 0 010 2.828l-7 7a2 2 0 01-2.828 0l-7-7A1.994 1.994 0 013 12V7a4 4 0 014-4z"
                        stroke-linecap="round"
                        stroke-linejoin="round"
                        stroke-width="2"
                      />
                    </svg>
                  </div>
                  <div class="ml-5 w-0 flex-1">
                    <dl>
                      <dt class="truncate text-sm font-medium text-purple-600">Output Tokens</dt>
                      <dd class="text-lg font-medium text-purple-900">
                        {{ formatNumber(usageStats?.totalOutputTokens || 0) }}
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>

            <div class="overflow-hidden rounded-lg bg-yellow-50 shadow">
              <div class="p-5">
                <div class="flex items-center">
                  <div class="flex-shrink-0">
                    <svg
                      class="h-6 w-6 text-yellow-600"
                      fill="none"
                      stroke="currentColor"
                      viewBox="0 0 24 24"
                    >
                      <path
                        d="M12 8c-1.657 0-3 .895-3 2s1.343 2 3 2 3 .895 3 2-1.343 2-3 2m0-8c1.11 0 2.08.402 2.599 1M12 8V7m0 1v8m0 0v1m0-1c-1.11 0-2.08-.402-2.599-1"
                        stroke-linecap="round"
                        stroke-linejoin="round"
                        stroke-width="2"
                      />
                    </svg>
                  </div>
                  <div class="ml-5 w-0 flex-1">
                    <dl>
                      <dt class="truncate text-sm font-medium text-yellow-600">Total Cost</dt>
                      <dd class="text-lg font-medium text-yellow-900">
                        ${{ (usageStats?.totalCost || 0).toFixed(4) }}
                      </dd>
                    </dl>
                  </div>
                </div>
              </div>
            </div>
          </div>

          <!-- User API Keys Table -->
          <div
            v-if="userDetails?.apiKeys?.length > 0"
            class="rounded-lg border border-gray-200 bg-white"
          >
            <div class="border-b border-gray-200 px-4 py-5 sm:px-6">
              <h4 class="text-lg font-medium leading-6 text-gray-900">API Keys Usage</h4>
            </div>
            <div class="overflow-hidden">
              <table class="min-w-full divide-y divide-gray-200">
                <thead class="bg-gray-50">
                  <tr>
                    <th
                      class="px-6 py-3 text-left text-xs font-medium uppercase tracking-wider text-gray-500"
                      scope="col"
                    >
                      API Key
                    </th>
                    <th
                      class="px-6 py-3 text-left text-xs font-medium uppercase tracking-wider text-gray-500"
                      scope="col"
                    >
                      Status
                    </th>
                    <th
                      class="px-6 py-3 text-left text-xs font-medium uppercase tracking-wider text-gray-500"
                      scope="col"
                    >
                      Requests
                    </th>
                    <th
                      class="px-6 py-3 text-left text-xs font-medium uppercase tracking-wider text-gray-500"
                      scope="col"
                    >
                      Tokens
                    </th>
                    <th
                      class="px-6 py-3 text-left text-xs font-medium uppercase tracking-wider text-gray-500"
                      scope="col"
                    >
                      Cost
                    </th>
                    <th
                      class="px-6 py-3 text-left text-xs font-medium uppercase tracking-wider text-gray-500"
                      scope="col"
                    >
                      Last Used
                    </th>
                  </tr>
                </thead>
                <tbody class="divide-y divide-gray-200 bg-white">
                  <tr v-for="apiKey in userDetails.apiKeys" :key="apiKey.id">
                    <td class="whitespace-nowrap px-6 py-4">
                      <div class="text-sm font-medium text-gray-900">{{ apiKey.name }}</div>
                      <div class="text-sm text-gray-500">{{ apiKey.keyPreview }}</div>
                    </td>
                    <td class="whitespace-nowrap px-6 py-4">
                      <span
                        :class="[
                          'inline-flex items-center rounded-full px-2.5 py-0.5 text-xs font-medium',
                          apiKey.isActive
                            ? 'bg-green-100 text-green-800'
                            : 'bg-red-100 text-red-800'
                        ]"
                      >
                        {{ apiKey.isActive ? 'Active' : 'Disabled' }}
                      </span>
                    </td>
                    <td class="whitespace-nowrap px-6 py-4 text-sm text-gray-900">
                      {{ formatNumber(apiKey.usage?.requests || 0) }}
                    </td>
                    <td class="whitespace-nowrap px-6 py-4 text-sm text-gray-900">
                      <div>In: {{ formatNumber(apiKey.usage?.inputTokens || 0) }}</div>
                      <div>Out: {{ formatNumber(apiKey.usage?.outputTokens || 0) }}</div>
                    </td>
                    <td class="whitespace-nowrap px-6 py-4 text-sm text-gray-900">
                      ${{ (apiKey.usage?.totalCost || 0).toFixed(4) }}
                    </td>
                    <td class="whitespace-nowrap px-6 py-4 text-sm text-gray-500">
                      {{ apiKey.lastUsedAt ? formatDate(apiKey.lastUsedAt) : 'Never' }}
                    </td>
                  </tr>
                </tbody>
              </table>
            </div>
          </div>

          <!-- Chart Placeholder -->
          <div class="rounded-lg border border-gray-200 bg-white">
            <div class="border-b border-gray-200 px-4 py-5 sm:px-6">
              <h4 class="text-lg font-medium leading-6 text-gray-900">Usage Trend</h4>
            </div>
            <div class="p-6">
              <div
                class="flex h-64 items-center justify-center rounded-lg border-2 border-dashed border-gray-300"
              >
                <div class="text-center">
                  <svg
                    class="mx-auto h-12 w-12 text-gray-400"
                    fill="none"
                    stroke="currentColor"
                    viewBox="0 0 24 24"
                  >
                    <path
                      d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z"
                      stroke-linecap="round"
                      stroke-linejoin="round"
                      stroke-width="2"
                    />
                  </svg>
                  <h3 class="mt-2 text-sm font-medium text-gray-900">Usage Chart</h3>
                  <p class="mt-1 text-sm text-gray-500">
                    Daily usage trends for {{ selectedPeriod }} period
                  </p>
                  <p class="mt-2 text-xs text-gray-400">
                    (Chart integration can be added with Chart.js, D3.js, or similar library)
                  </p>
                </div>
              </div>
            </div>
          </div>

          <!-- No Data State -->
          <div v-if="usageStats && usageStats.totalRequests === 0" class="py-12 text-center">
            <svg
              class="mx-auto h-12 w-12 text-gray-400"
              fill="none"
              stroke="currentColor"
              viewBox="0 0 24 24"
            >
              <path
                d="M9 19v-6a2 2 0 00-2-2H5a2 2 0 00-2 2v6a2 2 0 002 2h2a2 2 0 002-2zm0 0V9a2 2 0 012-2h2a2 2 0 012 2v10m-6 0a2 2 0 002 2h2a2 2 0 002-2m0 0V5a2 2 0 012-2h2a2 2 0 012 2v14a2 2 0 01-2 2h-2a2 2 0 01-2-2z"
                stroke-linecap="round"
                stroke-linejoin="round"
                stroke-width="2"
              />
            </svg>
            <h3 class="mt-2 text-sm font-medium text-gray-900">No usage data</h3>
            <p class="mt-1 text-sm text-gray-500">
              This user hasn't made any API requests in the selected period.
            </p>
          </div>
        </div>

        <div class="mt-6 flex justify-end">
          <button
            class="rounded-md border border-gray-300 px-4 py-2 text-sm font-medium text-gray-700 hover:bg-gray-50 focus:outline-none focus:ring-2 focus:ring-blue-500 focus:ring-offset-2"
            @click="$emit('close')"
          >
            Close
          </button>
        </div>
      </div>
    </div>
  </div>
</template>

<script setup>
import { ref, watch } from 'vue'
import { apiClient } from '@/config/api'
import { showToast } from '@/utils/toast'

const props = defineProps({
  show: {
    type: Boolean,
    default: false
  },
  user: {
    type: Object,
    default: null
  }
})

const emit = defineEmits(['close'])

const loading = ref(false)
const selectedPeriod = ref('week')
const usageStats = ref(null)
const userDetails = ref(null)

const formatNumber = (num) => {
  if (num >= 1000000) {
    return (num / 1000000).toFixed(1) + 'M'
  } else if (num >= 1000) {
    return (num / 1000).toFixed(1) + 'K'
  }
  return num.toString()
}

const formatDate = (dateString) => {
  if (!dateString) return null
  return new Date(dateString).toLocaleDateString('en-US', {
    year: 'numeric',
    month: 'short',
    day: 'numeric',
    hour: '2-digit',
    minute: '2-digit'
  })
}

const loadUsageStats = async () => {
  if (!props.user) return

  loading.value = true
  try {
    const [statsResponse, userResponse] = await Promise.all([
      apiClient.get(`/users/${props.user.id}/usage-stats`, {
        params: { period: selectedPeriod.value }
      }),
      apiClient.get(`/users/${props.user.id}`)
    ])

    if (statsResponse.success) {
      usageStats.value = statsResponse.stats
    }

    if (userResponse.success) {
      userDetails.value = userResponse.user
    }
  } catch (error) {
    console.error('Failed to load user usage stats:', error)
    showToast('Failed to load usage statistics', 'error')
  } finally {
    loading.value = false
  }
}

// Watch for when modal is shown and user changes
watch([() => props.show, () => props.user], ([show, user]) => {
  if (show && user) {
    loadUsageStats()
  }
})
</script>

<style scoped>
/* 组件特定样式 */
</style>