refactor(P3): HomeView 拆分为 3 composable + CommentDrawer 组件 (924行→~180行)

backend/internal/video/video_entity.go

@@ -14,7 +14,6 @@ type Video struct {
 	LikesCount  int64     `gorm:"column:likes_count;not null;default:0;index:idx_videos_likes_count_id,priority:1,sort:desc" json:"likes_count"`
 	Popularity  int64     `gorm:"column:popularity;not null;default:0;index:idx_videos_popularity_time_id,priority:1,sort:desc" json:"popularity"`
 }
-}
 
 type PublishVideoRequest struct {
 	Title       string `json:"title"`

frontend/src/components/CommentDrawer.vue

@@ -0,0 +1,153 @@
+<script setup lang="ts">
+import { reactive } from 'vue'
+
+import { ApiError } from '../api/client'
+import * as commentApi from '../api/comment'
+import type { Comment, FeedVideoItem } from '../api/types'
+import { useAuthStore } from '../stores/auth'
+import { useToastStore } from '../stores/toast'
+
+const props = defineProps<{ video: FeedVideoItem | null }>()
+const emit = defineEmits<{ close: [] }>()
+
+const auth = useAuthStore()
+const toast = useToastStore()
+
+const drawer = reactive({
+  loading: false,
+  error: '',
+  comments: [] as Comment[],
+  content: '',
+})
+
+function needLogin() {
+  toast.error('请先登录')
+}
+
+function close() {
+  drawer.comments = []
+  drawer.content = ''
+  drawer.error = ''
+  emit('close')
+}
+
+async function loadComments() {
+  if (!props.video) return
+  drawer.loading = true
+  drawer.error = ''
+  try {
+    drawer.comments = await commentApi.listAll(props.video.id)
+  } catch (e) {
+    drawer.error = e instanceof ApiError ? e.message : String(e)
+  } finally {
+    drawer.loading = false
+  }
+}
+
+async function publishComment() {
+  if (!props.video) return
+  if (!auth.isLoggedIn) return needLogin()
+  const content = drawer.content.trim()
+  if (!content) return
+  drawer.loading = true
+  drawer.error = ''
+  try {
+    await commentApi.publish(props.video.id, content)
+    drawer.content = ''
+    await loadComments()
+    toast.success('评论已发布')
+  } catch (e) {
+    drawer.error = e instanceof ApiError ? e.message : String(e)
+    toast.error(drawer.error)
+  } finally {
+    drawer.loading = false
+  }
+}
+
+function canDeleteComment(c: Comment) {
+  const myId = auth.claims?.account_id
+  return !!myId && myId === c.author_id
+}
+
+async function deleteComment(commentId: number) {
+  if (!props.video) return
+  if (!auth.isLoggedIn) return needLogin()
+  if (!window.confirm('确认删除这条评论？')) return
+  drawer.loading = true
+  drawer.error = ''
+  try {
+    await commentApi.remove(commentId)
+    await loadComments()
+    toast.info('评论已删除')
+  } catch (e) {
+    drawer.error = e instanceof ApiError ? e.message : String(e)
+    toast.error(drawer.error)
+  } finally {
+    drawer.loading = false
+  }
+}
+
+defineExpose({ loadComments })
+</script>
+
+<template>
+  <div class="drawer-backdrop" @click.self="close">
+    <div class="drawer">
+      <div class="drawer-head">
+        <div class="drawer-title">{{ video?.title ?? '评论' }}</div>
+        <button class="drawer-x" type="button" @click="close">×</button>
+      </div>
+
+      <div class="drawer-body">
+        <div v-if="drawer.loading" class="drawer-hint">加载中…</div>
+        <div v-else-if="drawer.error" class="drawer-hint bad">{{ drawer.error }}</div>
+        <div v-else-if="drawer.comments.length === 0" class="drawer-hint">暂无评论</div>
+
+        <div class="comment" v-for="c in drawer.comments" :key="c.id">
+          <div class="comment-top">
+            <div class="comment-user">{{ c.username }}</div>
+            <div class="comment-meta mono">#{{ c.id }} · {{ new Date(c.created_at).toLocaleString() }}</div>
+          </div>
+          <div class="comment-content">{{ c.content }}</div>
+          <div class="comment-actions">
+            <button v-if="canDeleteComment(c)" class="chip danger" type="button" :disabled="drawer.loading" @click="deleteComment(c.id)">删除</button>
+          </div>
+        </div>
+      </div>
+
+      <div class="drawer-foot">
+        <textarea v-model="drawer.content" placeholder="说点什么…" :disabled="drawer.loading" />
+        <div class="row" style="justify-content: space-between; margin-top: 8px">
+          <button class="chip" type="button" :disabled="drawer.loading" @click="loadComments">刷新</button>
+          <button class="chip primary" type="button" :disabled="drawer.loading || !drawer.content.trim()" @click="publishComment">发送</button>
+        </div>
+      </div>
+    </div>
+  </div>
+</template>
+
+<style scoped>
+.drawer-backdrop { position: fixed; inset: 0; background: rgba(0,0,0,0.55); backdrop-filter: blur(10px); z-index: 120; display: grid; justify-items: end; }
+.drawer { width: min(420px, calc(100vw - 18px)); height: 100vh; background: rgba(0,0,0,0.65); border-left: 1px solid rgba(255,255,255,0.12); display: grid; grid-template-rows: auto 1fr auto; }
+.drawer-head { display: flex; align-items: center; justify-content: space-between; padding: 14px 14px; border-bottom: 1px solid rgba(255,255,255,0.1); }
+.drawer-title { font-weight: 800; font-size: 14px; overflow: hidden; text-overflow: ellipsis; white-space: nowrap; }
+.drawer-x { width: 34px; height: 34px; border-radius: 12px; border: 1px solid rgba(255,255,255,0.14); background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.9); cursor: pointer; font-size: 20px; line-height: 1; }
+.drawer-body { overflow: auto; padding: 12px 14px; display: grid; gap: 10px; }
+.drawer-foot { border-top: 1px solid rgba(255,255,255,0.1); padding: 12px 14px; }
+.drawer-foot textarea { width: 100%; min-height: 82px; resize: none; border-radius: 14px; border: 1px solid rgba(255,255,255,0.14); background: rgba(255,255,255,0.06); color: rgba(255,255,255,0.9); padding: 10px 12px; outline: none; }
+.drawer-hint { color: rgba(255,255,255,0.78); padding: 12px 0; }
+.drawer-hint.bad { color: rgba(254,44,85,0.92); }
+.comment { border: 1px solid rgba(255,255,255,0.1); background: rgba(255,255,255,0.05); border-radius: 14px; padding: 10px 10px; }
+.comment-top { display: grid; gap: 3px; }
+.comment-user { font-weight: 700; font-size: 13px; }
+.comment-meta { font-size: 12px; color: rgba(255,255,255,0.55); }
+.comment-content { margin-top: 8px; font-size: 13px; line-height: 1.35; color: rgba(255,255,255,0.86); white-space: pre-wrap; word-break: break-word; }
+.comment-actions { margin-top: 10px; display: flex; justify-content: flex-end; }
+.chip { display: inline-flex; align-items: center; gap: 8px; padding: 7px 10px; border-radius: 999px; border: 1px solid rgba(255,255,255,0.14); background: rgba(0,0,0,0.28); color: rgba(255,255,255,0.86); font-size: 12px; text-decoration: none; cursor: pointer; }
+.chip.primary { border-color: rgba(254,44,85,0.45); background: rgba(254,44,85,0.14); }
+.chip.danger { border-color: rgba(254,44,85,0.55); background: rgba(254,44,85,0.12); }
+@media (max-width: 900px) {
+  .drawer-backdrop { justify-items: center; align-items: end; }
+  .drawer { width: calc(100vw - 16px); height: min(72vh, 560px); border-left: none; border-top: 1px solid rgba(255,255,255,0.12); border-radius: 18px 18px 0 0; overflow: hidden; }
+}
+</style>

frontend/src/composables/useLikeFollow.ts

@@ -0,0 +1,67 @@
+import { reactive } from 'vue'
+import { ApiError } from '../api/client'
+import * as likeApi from '../api/like'
+import type { FeedVideoItem } from '../api/types'
+import { useAuthStore } from '../stores/auth'
+import { useSocialStore } from '../stores/social'
+import { useToastStore } from '../stores/toast'
+
+export function useLikeFollow(needLogin: () => void) {
+  const auth = useAuthStore()
+  const social = useSocialStore()
+  const toast = useToastStore()
+
+  const likeBusy = reactive<Record<string, boolean>>({})
+  const followBusy = reactive<Record<string, boolean>>({})
+
+  async function toggleLike(item: FeedVideoItem) {
+    if (!auth.isLoggedIn) return needLogin()
+    const key = String(item.id)
+    if (likeBusy[key]) return
+    likeBusy[key] = true
+    try {
+      if (item.is_liked) await likeApi.unlike(item.id)
+      else await likeApi.like(item.id)
+      item.is_liked = !item.is_liked
+      item.likes_count = Math.max(0, item.likes_count + (item.is_liked ? 1 : -1))
+    } catch (e) {
+      const msg = e instanceof ApiError ? e.message : String(e)
+      toast.error(msg)
+    } finally {
+      likeBusy[key] = false
+    }
+  }
+
+  async function toggleFollow(authorId: number) {
+    if (!auth.isLoggedIn) return needLogin()
+    const key = String(authorId)
+    if (followBusy[key]) return
+    followBusy[key] = true
+    try {
+      if (social.isFollowing(authorId)) {
+        await social.unfollow(authorId)
+        toast.info('已取关')
+      } else {
+        await social.follow(authorId)
+        toast.success('已关注')
+      }
+    } catch (e) {
+      const msg = e instanceof ApiError ? e.message : String(e)
+      toast.error(msg)
+    } finally {
+      followBusy[key] = false
+    }
+  }
+
+  async function share(item: FeedVideoItem) {
+    const url = `${location.origin}/video/${item.id}`
+    try {
+      await navigator.clipboard.writeText(url)
+      toast.success('链接已复制')
+    } catch {
+      window.prompt('复制链接', url)
+    }
+  }
+
+  return { likeBusy, followBusy, toggleLike, toggleFollow, share }
+}

frontend/src/composables/useVideoFeed.ts

@@ -0,0 +1,112 @@
+import { computed, reactive, ref } from 'vue'
+import { ApiError } from '../api/client'
+import * as feedApi from '../api/feed'
+import type { FeedVideoItem } from '../api/types'
+import { useAuthStore } from '../stores/auth'
+
+export type TabKey = 'recommend' | 'hot' | 'following'
+
+export function useVideoFeed() {
+  const auth = useAuthStore()
+  const tab = ref<TabKey>('recommend')
+
+  const recommend = reactive({
+    items: [] as FeedVideoItem[],
+    loading: false, error: '',
+    hasMore: false, nextTime: 0,
+  })
+
+  const hot = reactive({
+    items: [] as FeedVideoItem[],
+    loading: false, error: '',
+    hasMore: false,
+    nextLikesCountBefore: undefined as number | undefined,
+    nextIdBefore: undefined as number | undefined,
+  })
+
+  const following = reactive({
+    items: [] as FeedVideoItem[],
+    loading: false, error: '',
+    hasMore: false, nextTime: 0,
+  })
+
+  const currentState = computed(() => {
+    if (tab.value === 'hot') return hot
+    if (tab.value === 'following') return following
+    return recommend
+  })
+
+  async function loadRecommend(reset: boolean) {
+    if (recommend.loading) return
+    recommend.loading = true
+    recommend.error = ''
+    try {
+      const res = await feedApi.listLatest({ limit: 10, latest_time: reset ? 0 : recommend.nextTime })
+      recommend.hasMore = res.has_more
+      recommend.nextTime = res.next_time
+      recommend.items = reset ? res.video_list : recommend.items.concat(res.video_list)
+    } catch (e) {
+      recommend.error = e instanceof ApiError ? e.message : String(e)
+    } finally {
+      recommend.loading = false
+    }
+  }
+
+  async function loadHot(reset: boolean) {
+    if (hot.loading) return
+    hot.loading = true
+    hot.error = ''
+    try {
+      const res = await feedApi.listLikesCount({
+        limit: 10,
+        likes_count_before: reset ? undefined : hot.nextLikesCountBefore,
+        id_before: reset ? undefined : hot.nextIdBefore,
+      })
+      hot.hasMore = res.has_more
+      hot.nextLikesCountBefore = res.next_likes_count_before
+      hot.nextIdBefore = res.next_id_before
+      hot.items = reset ? res.video_list : hot.items.concat(res.video_list)
+    } catch (e) {
+      hot.error = e instanceof ApiError ? e.message : String(e)
+    } finally {
+      hot.loading = false
+    }
+  }
+
+  async function loadFollowing(reset: boolean) {
+    if (!auth.isLoggedIn) {
+      following.error = '登录后才能查看关注流'
+      return
+    }
+    if (following.loading) return
+    following.loading = true
+    following.error = ''
+    try {
+      const res = await feedApi.listByFollowing({ limit: 10, latest_time: reset ? 0 : following.nextTime })
+      following.hasMore = res.has_more
+      following.nextTime = res.next_time
+      following.items = reset ? res.video_list : following.items.concat(res.video_list)
+    } catch (e) {
+      following.error = e instanceof ApiError ? e.message : String(e)
+    } finally {
+      following.loading = false
+    }
+  }
+
+  async function ensureTabLoaded() {
+    if (tab.value === 'recommend' && recommend.items.length === 0) await loadRecommend(true)
+    if (tab.value === 'hot' && hot.items.length === 0) await loadHot(true)
+    if (tab.value === 'following' && following.items.length === 0) await loadFollowing(true)
+  }
+
+  async function loadMoreIfNeeded(activeIndex: number) {
+    const items = currentState.value.items
+    if (items.length === 0) return
+    if (activeIndex < items.length - 3) return
+    if (tab.value === 'recommend' && recommend.hasMore) await loadRecommend(false)
+    if (tab.value === 'hot' && hot.hasMore) await loadHot(false)
+    if (tab.value === 'following' && following.hasMore) await loadFollowing(false)
+  }
+
+  return { tab, recommend, hot, following, currentState, loadRecommend, loadHot, loadFollowing, ensureTabLoaded, loadMoreIfNeeded }
+}

frontend/src/composables/useVideoPlayer.ts

@@ -0,0 +1,78 @@
+import { ref } from 'vue'
+import { useToastStore } from '../stores/toast'
+
+export function useVideoPlayer(scrollerRef: ReturnType<typeof ref<HTMLDivElement | null>>) {
+  const toast = useToastStore()
+  const muted = ref(true)
+  const activeIndex = ref(0)
+  const videoMap = new Map<number, HTMLVideoElement>()
+
+  function getScrollerHeight() {
+    return scrollerRef.value?.clientHeight ?? 0
+  }
+
+  function setVideoRef(id: number, el: HTMLVideoElement | null) {
+    if (el) {
+      el.muted = muted.value
+      videoMap.set(id, el)
+    } else {
+      videoMap.delete(id)
+    }
+  }
+
+  function scrollToIndex(idx: number, totalItems: number) {
+    const el = scrollerRef.value
+    if (!el) return
+    const h = getScrollerHeight()
+    if (!h) return
+    const next = Math.max(0, Math.min(idx, Math.max(0, totalItems - 1)))
+    el.scrollTo({ top: next * h, behavior: 'smooth' })
+  }
+
+  let scrollRaf = 0
+  function onScroll() {
+    if (!scrollerRef.value) return
+    if (scrollRaf) return
+    scrollRaf = window.requestAnimationFrame(() => {
+      scrollRaf = 0
+      const el = scrollerRef.value
+      if (!el) return
+      const h = el.clientHeight
+      if (!h) return
+      const idx = Math.round(el.scrollTop / h)
+      if (idx !== activeIndex.value) activeIndex.value = idx
+    })
+  }
+
+  async function playActive(activeItemId: number | undefined) {
+    if (!activeItemId) return
+    for (const [id, v] of videoMap.entries()) {
+      if (id === activeItemId) continue
+      v.pause()
+    }
+    const video = videoMap.get(activeItemId)
+    if (!video) return
+    video.muted = muted.value
+    try {
+      await video.play()
+    } catch {
+      /* ignore autoplay errors */
+    }
+  }
+
+  function toggleMute() {
+    muted.value = !muted.value
+    for (const v of videoMap.values()) v.muted = muted.value
+    toast.info(muted.value ? '已静音' : '已取消静音')
+  }
+
+  function togglePlayPause(activeItemId: number | undefined) {
+    if (!activeItemId) return
+    const video = videoMap.get(activeItemId)
+    if (!video) return
+    if (video.paused) void video.play()
+    else video.pause()
+  }
+
+  return { muted, activeIndex, videoMap, setVideoRef, scrollToIndex, onScroll, playActive, toggleMute, togglePlayPause }
+}