<template>
  <div style="max-width: 1100px">
    <n-breadcrumb style="margin-bottom: 16px">
      <n-breadcrumb-item @click="navigateTo('/admin/faqs')">常见问答</n-breadcrumb-item>
      <n-breadcrumb-item>{{ isNew ? '新增' : '编辑' }}</n-breadcrumb-item>
    </n-breadcrumb>

    <n-space justify="space-between" align="center" style="margin-bottom: 24px">
      <h1 style="margin: 0; font-size: 20px; font-weight: 600; color: #111827">{{ isNew ? '新增问答' : '编辑问答' }}</h1>
      <n-space>
        <n-button secondary @click="navigateTo('/admin/faqs')">取消</n-button>
        <n-button type="primary" :loading="saving" @click="handleSave">保存</n-button>
      </n-space>
    </n-space>

    <n-card v-if="loadError" style="text-align: center; color: #ef4444">{{ loadError }}</n-card>
    <n-spin v-else-if="pageLoading" style="display: flex; justify-content: center; padding: 60px" />

    <template v-else>
      <n-card style="max-width: 700px">
        <n-form label-placement="top">
          <n-form-item label="问题" required>
            <n-input v-model:value="form.question" placeholder="输入常见问题" />
          </n-form-item>
          <n-form-item label="答案" required>
            <n-input v-model:value="form.answer" type="textarea" :rows="8" placeholder="输入答案内容" />
          </n-form-item>
          <n-form-item label="排序">
            <n-input-number v-model:value="form.sortOrder" :min="0" placeholder="数字越小越靠前" style="width: 200px" />
          </n-form-item>
          <n-form-item label="状态">
            <n-select v-model:value="form.published" :options="[{ label: '已发布', value: true }, { label: '草稿', value: false }]" style="width: 200px" />
          </n-form-item>
        </n-form>
      </n-card>

      <n-alert v-if="formError" type="error" style="margin-top: 12px; max-width: 700px">{{ formError }}</n-alert>

      <div class="save-bar">
        <n-button secondary @click="navigateTo('/admin/faqs')">取消</n-button>
        <n-button type="primary" :loading="saving" @click="handleSave">保存</n-button>
      </div>
    </template>
  </div>
</template>

<script setup>
import { NButton, NCard, NSpace, NInput, NInputNumber, NForm, NFormItem, NSelect, NBreadcrumb, NBreadcrumbItem, NSpin, NAlert } from 'naive-ui'
import { useMessage } from 'naive-ui'

definePageMeta({ layout: 'admin', middleware: 'admin' })

const route = useRoute()
const { adminFetch } = useAdmin()
const message = useMessage()

const isNew = computed(() => route.params.id === 'new')
const pageLoading = ref(!isNew.value)
const loadError = ref('')
const saving = ref(false)
const formError = ref('')

const form = ref({ question: '', answer: '', sortOrder: 0, published: true })

async function loadItem() {
  if (isNew.value) return
  pageLoading.value = true
  try {
    const data = await adminFetch(`/api/admin/faqs/${route.params.id}`)
    form.value = { ...data, published: !!data.published }
  } catch (e) { loadError.value = e.data?.message || '加载失败' }
  finally { pageLoading.value = false }
}

async function handleSave() {
  if (!form.value.question?.trim()) { formError.value = '问题不能为空'; return }
  if (!form.value.answer?.trim()) { formError.value = '答案不能为空'; return }
  saving.value = true; formError.value = ''
  try {
    if (isNew.value) {
      await adminFetch('/api/admin/faqs', { method: 'POST', body: form.value })
      message.success('创建成功')
      setTimeout(() => navigateTo('/admin/faqs'), 800)
    } else {
      await adminFetch(`/api/admin/faqs/${route.params.id}`, { method: 'PUT', body: form.value })
      message.success('保存成功')
    }
  } catch (e) { formError.value = e.data?.message || '保存失败' }
  finally { saving.value = false }
}

onMounted(loadItem)
</script>

<style scoped>
.save-bar { position: sticky; bottom: 0; display: flex; justify-content: flex-end; gap: 8px; padding: 16px 0; margin-top: 24px; background: #f0f2f5; border-top: 1px solid #e5e7eb; max-width: 700px; }
</style>
