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

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 }
+}