<template>
  <main class="goods-page">
    <section class="goods-hero" :style="heroStyle">
      <div class="goods-hero-mask">
        <div class="mx-auto max-w-screen-xl px-4 py-8">
          <a-breadcrumb class="goods-breadcrumb">
            <a-breadcrumb-item>
              <NuxtLink to="/">首页</NuxtLink>
            </a-breadcrumb-item>
            <a-breadcrumb-item>商品</a-breadcrumb-item>
            <a-breadcrumb-item>{{ pageTitle }}</a-breadcrumb-item>
          </a-breadcrumb>

          <div class="goods-hero-title">{{ pageTitle }}</div>

          <div class="goods-hero-meta">
            <a-tag v-if="typeof total === 'number'" color="green">共 {{ total }} 件</a-tag>
            <a-tag v-if="keywords" color="blue">关键词：{{ keywords }}</a-tag>
          </div>

          <div class="mt-4 flex flex-wrap items-center gap-2">
            <a-input
              v-model:value="keywordInput"
              allow-clear
              class="w-full sm:w-80"
              placeholder="搜索商品名称/关键词"
              @press-enter="applySearch"
            />
            <a-button type="primary" @click="applySearch">搜索</a-button>
            <a-button v-if="keywords" @click="clearSearch">清除</a-button>
          </div>
        </div>
      </div>
    </section>

    <section class="mx-auto max-w-screen-xl px-4 py-10">
      <a-card class="goods-card" :bordered="false">
        <a-skeleton v-if="pending" active :paragraph="{ rows: 10 }" />

        <a-result
          v-else-if="!isValidCategoryId"
          status="404"
          title="分类不存在"
          sub-title="分类ID无效或缺失。"
        >
          <template #extra>
            <a-space>
              <a-button type="primary" @click="navigateTo('/')">返回首页</a-button>
            </a-space>
          </template>
        </a-result>

        <a-result
          v-else-if="loadError"
          status="error"
          title="商品加载失败"
          :sub-title="loadError.message"
        >
          <template #extra>
            <a-space>
              <a-button type="primary" @click="refresh()">重试</a-button>
              <a-button @click="navigateTo('/')">返回首页</a-button>
            </a-space>
          </template>
        </a-result>

        <template v-else>
          <a-empty v-if="!goodsList.length" description="暂无商品" />

          <div v-else class="grid grid-cols-12 gap-6">
            <a-card
              v-for="(g, idx) in goodsList"
              :key="String(g.goodsId ?? g.code ?? `${String(route.params.navigationId)}-${idx}`)"
              hoverable
              class="col-span-12 sm:col-span-6 lg:col-span-3 goods-item"
              @click="goDetail(g)"
            >
              <template #cover>
                <img
                  class="goods-cover"
                  :src="resolveGoodsImage(g)"
                  :alt="resolveGoodsTitle(g)"
                  loading="lazy"
                  @error="onImgError"
                />
              </template>

              <a-card-meta :title="resolveGoodsTitle(g)">
                <template #description>
                  <div class="goods-desc">
                    <div class="goods-price-row">
                      <span class="goods-price">
                        {{ formatMoney(resolveGoodsPrice(g)) }}
                        <span v-if="resolveGoodsUnit(g)" class="goods-unit">/ {{ resolveGoodsUnit(g) }}</span>
                      </span>
                      <a-tag v-if="Number(g.isNew) === 1" color="blue">新品</a-tag>
                      <a-tag v-if="Number(g.recommend) === 1" color="green">推荐</a-tag>
                    </div>
                    <div class="goods-sub">
                      <span v-if="typeof g.sales === 'number'">销量 {{ g.sales }}</span>
                      <span v-if="typeof g.stock === 'number'">库存 {{ g.stock }}</span>
                    </div>
                  </div>
                </template>
              </a-card-meta>
            </a-card>
          </div>

          <div v-if="total > 0" class="mt-6 flex items-center justify-end">
            <a-pagination
              :current="page"
              :page-size="limit"
              :total="total"
              show-size-changer
              :page-size-options="['12', '24', '48', '96']"
              @change="onPageChange"
              @show-size-change="onPageSizeChange"
            />
          </div>
        </template>
      </a-card>
    </section>
  </main>
</template>

<script setup lang="ts">
import { pageShopGoods } from '@/api/shop/shopGoods'
import type { ShopGoods } from '@/api/shop/shopGoods/model'
import { getShopGoodsCategory } from '@/api/shop/shopGoodsCategory'
import type { ShopGoodsCategory } from '@/api/shop/shopGoodsCategory/model'
import type { LocationQueryRaw } from 'vue-router'

const route = useRoute()
const router = useRouter()

function parseNumberParam(raw: unknown): number {
  const text = Array.isArray(raw) ? raw[0] : raw
  const n = Number(text)
  return Number.isFinite(n) ? n : NaN
}

function parsePositiveInt(raw: unknown, fallback: number) {
  const text = Array.isArray(raw) ? raw[0] : raw
  const n = Number(text)
  if (!Number.isFinite(n)) return fallback
  const i = Math.floor(n)
  return i > 0 ? i : fallback
}

function parseQueryString(raw: unknown) {
  const text = Array.isArray(raw) ? raw[0] : raw
  return typeof text === 'string' ? text.trim() : ''
}

const categoryId = computed(() => parseNumberParam(route.params.navigationId))
const isValidCategoryId = computed(() => Number.isFinite(categoryId.value) && categoryId.value > 0)

const page = computed(() => parsePositiveInt(route.query.page, 1))
const limit = computed(() => parsePositiveInt(route.query.limit, 12))
const keywords = computed(() => parseQueryString(route.query.q))

const keywordInput = ref(keywords.value)
watch(
  () => keywords.value,
  (v) => {
    keywordInput.value = v
  }
)

function updateQuery(next: LocationQueryRaw) {
  // Keep list state shareable via URL.
  router.replace({
    path: route.path,
    query: {
      ...route.query,
      ...next
    }
  })
}

function applySearch() {
  updateQuery({ q: keywordInput.value?.trim() || undefined, page: 1 })
}

function clearSearch() {
  keywordInput.value = ''
  updateQuery({ q: undefined, page: 1 })
}

function onPageChange(nextPage: number) {
  updateQuery({ page: nextPage })
}

function onPageSizeChange(_current: number, nextSize: number) {
  updateQuery({ limit: nextSize, page: 1 })
}

const { data: category } = await useAsyncData<ShopGoodsCategory | null>(
  () => `shop-goods-category-${String(route.params.navigationId)}`,
  async () => {
    if (!isValidCategoryId.value) return null
    return await getShopGoodsCategory(categoryId.value).catch(() => null)
  },
  { watch: [categoryId] }
)

const {
  data: goodsPage,
  pending,
  error: loadError,
  refresh
} = await useAsyncData<{ list: ShopGoods[]; count: number } | null>(
  () =>
    `shop-goods-${String(route.params.navigationId)}-${page.value}-${limit.value}-${keywords.value}`,
  async () => {
    if (!isValidCategoryId.value) return null
    return await pageShopGoods({
      categoryId: categoryId.value,
      page: page.value,
      limit: limit.value,
      keywords: keywords.value || undefined
    })
  },
  { watch: [categoryId, page, limit, keywords] }
)

const goodsList = computed(() => goodsPage.value?.list ?? [])
const total = computed(() => goodsPage.value?.count ?? 0)

function goDetail(g: ShopGoods) {
  const id = (g as unknown as { goodsId?: unknown }).goodsId
  const n = typeof id === 'number' ? id : Number(id)
  if (!Number.isFinite(n)) return
  navigateTo(`/goods-item/${n}`)
}

function pickString(obj: unknown, key: string) {
  if (!obj || typeof obj !== 'object') return ''
  const record = obj as Record<string, unknown>
  const value = record[key]
  return typeof value === 'string' ? value.trim() : ''
}

const pageTitle = computed(() => {
  const name = category.value?.title?.trim()
  if (name) return name
  if (isValidCategoryId.value) return `分类 ${categoryId.value}`
  return '商品列表'
})

const heroStyle = computed(() => {
  const banner = pickString(category.value, 'image')
  if (banner) {
    return {
      backgroundImage: `url(${banner})`
    }
  }
  return {}
})

function resolveGoodsTitle(g: ShopGoods) {
  return String(g.goodsName || g.name || g.code || '未命名商品').trim()
}

function resolveGoodsPrice(g: ShopGoods) {
  const anyG = g as unknown as Record<string, unknown>
  const candidates = [
    anyG.salePrice,
    anyG.price,
    anyG.chainStorePrice,
    anyG.originPrice,
    anyG.buyingPrice
  ]
  for (const v of candidates) {
    if (typeof v === 'number' && Number.isFinite(v)) return v
    if (typeof v === 'string' && v.trim()) return v.trim()
  }
  return undefined
}

function resolveGoodsUnit(g: ShopGoods) {
  const unit = (g as unknown as { unitName?: unknown }).unitName
  if (typeof unit === 'string' && unit.trim()) return unit.trim()
  return ''
}

function resolveGoodsImage(g: ShopGoods) {
  const img = typeof g.image === 'string' ? g.image.trim() : ''
  if (img) return img
  const files = typeof g.files === 'string' ? g.files.trim() : ''
  if (files) {
    // Some APIs store files as JSON array string: [{ url: "..." }, ...]
    if (files.startsWith('[')) {
      try {
        const parsed = JSON.parse(files) as unknown
        if (Array.isArray(parsed)) {
          const first = parsed[0] as any
          const url = typeof first?.url === 'string' ? first.url.trim() : ''
          if (url) return url
        }
      } catch {
        // ignore JSON parse errors
      }
    }
    return files.split(',')[0]?.trim() || ''
  }
  // Keep it empty -> browser will trigger @error and swap to placeholder.
  return ''
}

function onImgError(e: Event) {
  const img = e.target as HTMLImageElement | null
  if (!img) return
  img.onerror = null
  img.src =
    'https://oss.wsdns.cn/20251226/675876f9f5a84732b22efc02b275440a.png'
}

function formatMoney(value: unknown) {
  if (typeof value === 'number' && Number.isFinite(value)) return `¥${value.toFixed(2)}`
  const v = typeof value === 'string' ? value.trim() : ''
  if (!v) return '-'
  const n = Number(v)
  if (!Number.isFinite(n)) return `¥${v}`
  return `¥${n.toFixed(2)}`
}

const seoTitle = computed(() => `${pageTitle.value} - 商品`)
const seoDescription = computed(() => {
  if (!isValidCategoryId.value) return '商品分类列表'
  const suffix = keywords.value ? `，关键词：${keywords.value}` : ''
  return `分类 ${pageTitle.value} 商品列表${suffix}`
})

useSeoMeta({
  title: seoTitle,
  description: seoDescription,
  ogTitle: seoTitle,
  ogDescription: seoDescription,
  ogType: 'website'
})

const canonicalUrl = computed(() => {
  if (import.meta.client) return window.location.href
  try {
    return useRequestURL().href
  } catch {
    return ''
  }
})

useHead(() => ({
  link: canonicalUrl.value ? [{ rel: 'canonical', href: canonicalUrl.value }] : []
}))
</script>

<style scoped>
.goods-page {
  background: #f4f6f8;
}

.goods-hero {
  background:
    radial-gradient(circle at 15% 20%, rgba(22, 163, 74, 0.22), transparent 60%),
    radial-gradient(circle at 85% 10%, rgba(59, 130, 246, 0.18), transparent 55%),
    linear-gradient(180deg, #ffffff, #f8fafc);
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
}

.goods-hero-mask {
  background: linear-gradient(180deg, rgba(255, 255, 255, 0.88), rgba(255, 255, 255, 0.92));
}

.goods-breadcrumb {
  color: rgba(0, 0, 0, 0.6);
}

.goods-hero-title {
  margin-top: 10px;
  font-size: 30px;
  font-weight: 900;
  color: rgba(0, 0, 0, 0.88);
  line-height: 1.2;
}

.goods-hero-meta {
  margin-top: 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.goods-card {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 28px rgba(0, 0, 0, 0.06);
}

.goods-cover {
  width: 100%;
  height: 180px;
  object-fit: cover;
  display: block;
  background: #f3f4f6;
}

.goods-desc {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.goods-price-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.goods-price {
  color: #16a34a;
  font-weight: 800;
}

.goods-unit {
  color: rgba(0, 0, 0, 0.6);
  font-weight: 600;
  margin-left: 4px;
}

.goods-sub {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
  color: rgba(0, 0, 0, 0.55);
  font-size: 12px;
}
</style>
