<script setup lang="ts">
import { computed, onMounted, ref } from 'vue'
import { useRouter } from 'vue-router'
import {
  NCard, NSpace, NTag, NText, NSelect, NInput, NButton, NEmpty, NSkeleton, NSpin,
  NPagination,
} from 'naive-ui'
import { articlesApi, sourcesApi, type ArticleListItem, type Source } from '@/api/articles'
import { useAuthStore } from '@/stores/auth'
import dayjs from 'dayjs'
import relativeTime from 'dayjs/plugin/relativeTime'
import 'dayjs/locale/zh-cn'
dayjs.extend(relativeTime)
dayjs.locale('zh-cn')

const router = useRouter()
const auth = useAuthStore()
const items = ref<ArticleListItem[]>([])
const sources = ref<Source[]>([])
const loading = ref(false)

// === 页码分页(替代原来的 cursor 无限滚动)===
const page = ref(1)
const pageSize = ref(50)
const total = ref(0)
const totalPages = ref(1)

const sourceFilter = ref<string[]>([])
const q = ref('')

const sourceOptions = ref<{ label: string; value: string }[]>([])

async function load() {
  if (loading.value) return
  loading.value = true
  try {
    const resp = await articlesApi.list({
      source: sourceFilter.value.join(',') || undefined,
      q: q.value || undefined,
      page: page.value,
      page_size: pageSize.value,
    })
    items.value = resp.items
    total.value = resp.total
    totalPages.value = resp.total_pages
  } finally {
    loading.value = false
  }
}

async function loadSources() {
  sources.value = await sourcesApi.list()
  sourceOptions.value = sources.value.map((s) => ({ label: s.name, value: s.slug }))
}

// 切页 → 重新加载 + 滚到顶部
function onPageChange(p: number) {
  page.value = p
  load()
  window.scrollTo({ top: 0, behavior: 'smooth' })
}

// 筛选/搜索变化 → 回到第 1 页
function resetToFirstPage() {
  page.value = 1
  load()
}

function open(a: ArticleListItem) {
  router.push(`/article/${a.id}`)
}

function star(a: ArticleListItem) {
  a.is_starred = !a.is_starred
}

function fmtTime(s?: string | null) {
  if (!s) return '—'
  return dayjs(s).fromNow()
}

// category 是逗号分隔字符串(LLM 输出),拆成多个 tag
function splitCategory(c?: string | null): string[] {
  if (!c) return []
  return c.split(',').map((s) => s.trim()).filter(Boolean)
}

// 评论预览:长文截断
function previewCommentary(c?: string | null, max = 120): string {
  if (!c) return ''
  const trimmed = c.replace(/\s+/g, ' ').trim()
  return trimmed.length > max ? trimmed.slice(0, max) + '…' : trimmed
}

function commentaryStatusType(s?: string | null): 'success' | 'warning' | 'error' | 'default' {
  if (s === 'ok') return 'success'
  if (s === 'failed') return 'error'
  if (s === 'pending') return 'warning'
  return 'default'
}

// 正文摘要(取 body_zh_text 前 N 字;没有就 fallback 到 summary_zh)
function bodyExcerpt(text?: string | null, max = 200): string {
  if (!text) return ''
  const trimmed = text.replace(/\s+/g, ' ').trim()
  return trimmed.length > max ? trimmed.slice(0, max) + '…' : trimmed
}

const itemsLabel = computed(() => `共 ${total.value} 条`)

onMounted(async () => {
  await loadSources()
  await load()
})
</script>

<template>
  <NSpace vertical>
    <NSpace align="center" justify="space-between">
      <NSpace>
        <NSelect
          v-model:value="sourceFilter"
          multiple
          clearable
          placeholder="按源筛选"
          :options="sourceOptions"
          style="min-width: 240px"
          @update:value="resetToFirstPage"
        />
        <NInput v-model:value="q" placeholder="关键词搜索" clearable style="width: 200px"
                @keyup.enter="resetToFirstPage" @clear="resetToFirstPage" />
        <NButton @click="resetToFirstPage">刷新</NButton>
      </NSpace>
      <NText depth="3">{{ itemsLabel }}</NText>
    </NSpace>

    <NSpin :show="loading && items.length === 0">
      <NSkeleton v-if="loading && items.length === 0" :repeat="4" />
      <NEmpty v-else-if="items.length === 0 && !loading" description="暂无新闻" />
      <div v-else>
        <NCard
          v-for="a in items"
          :key="a.id"
          class="article-card"
          hoverable
          @click="open(a)"
        >
          <NSpace vertical :size="6">
            <NSpace align="center" :size="8">
              <NTag size="small" type="info">{{ a.source.name }}</NTag>
              <NTag v-if="a.lang_src" size="small">{{ a.lang_src }}</NTag>
              <NTag v-if="a.translation_status !== 'ok'" size="small" type="warning">
                {{ a.translation_status }}
              </NTag>
              <NTag
                v-for="c in splitCategory(a.category)"
                :key="c"
                size="small"
                type="success"
              >
                {{ c }}
              </NTag>
              <NText depth="3" style="font-size: 12px">{{ fmtTime(a.published_at || a.fetched_at) }}</NText>
            </NSpace>

            <!-- 原标题(灰色,辅助) -->
            <div style="font-size: 13px; color: #999; line-height: 1.4;">
              {{ a.title }}
            </div>
            <!-- 中文标题(主标题) -->
            <div v-if="a.title_zh" style="font-size: 18px; font-weight: 600; color: #333; line-height: 1.4;">
              {{ a.title_zh }}
            </div>

            <!-- AI 插图(若有) -->
            <img
              v-if="a.image_ai_url || a.image_url"
              :src="a.image_ai_url || a.image_url || ''"
              style="
                display: block;
                max-width: 100%;
                max-height: 280px;
                object-fit: cover;
                border-radius: 4px;
                margin: 4px 0;
              "
              referrerpolicy="no-referrer"
              loading="lazy"
            />

            <!-- 翻译后正文摘要(列表钩子,详情页有完整版) -->
            <div
              v-if="a.body_zh_text || a.summary_zh"
              style="
                margin-top: 6px;
                color: #444;
                font-size: 14px;
                line-height: 1.7;
              "
            >
              {{ bodyExcerpt(a.body_zh_text || a.summary_zh, 220) }}
            </div>

            <!-- 评论预览 -->
            <div
              v-if="a.commentary"
              style="
                margin-top: 8px;
                padding: 8px 10px;
                background: #f6f8ff;
                border-left: 3px solid #2080f0;
                border-radius: 4px;
                color: #444;
                font-size: 13px;
                line-height: 1.6;
              "
            >
              <NSpace align="center" :size="6" style="margin-bottom: 4px">
                <NText depth="2" style="font-size: 12px; font-weight: 600">💬 评论</NText>
                <NTag size="tiny" :type="commentaryStatusType(a.commentary_status)">
                  {{ a.commentary_status || 'n/a' }}
                </NTag>
              </NSpace>
              <span>{{ previewCommentary(a.commentary, 140) }}</span>
            </div>
          </NSpace>
        </NCard>

        <!-- 页码分页(替代无限滚动) -->
        <NSpace v-if="total > 0" justify="center" style="margin: 24px 0 16px">
          <NPagination
            v-model:page="page"
            :page-count="totalPages"
            :page-size="pageSize"
            show-quick-jumper
            @update:page="onPageChange"
          />
        </NSpace>
        <NText v-else depth="3" style="display:block; text-align:center; padding: 16px">— 暂无数据 —</NText>
      </div>
    </NSpin>
  </NSpace>
</template>
