<script setup>
import { computed, ref, watch } from 'vue'
import { useRoute, useRouter } from 'vue-router'
import { api } from '../lib/api'
import { editorPath, followingFeedPath, loginPath } from '../lib/paths'
import { toApiUrl } from '../lib/runtime'
import { useAuthStore } from '../stores/auth'
import { useToast } from '../composables/useToast'

const route = useRoute()
const router = useRouter()
const auth = useAuthStore()
const toast = useToast()

const userId = computed(() => route.params.userId || '')
const profile = ref(null)
const tierLists = ref([])
const query = ref('')
const isLoading = ref(false)
const isFollowBusy = ref(false)
const error = ref('')
const brokenThumbnailIds = ref({})

const profileAvatarUrl = computed(() => (profile.value?.avatarSrc ? toApiUrl(profile.value.avatarSrc) : ''))
const profileDisplayName = computed(() => profile.value?.nickname || profile.value?.accountName || '알 수 없음')
const profileFallback = computed(() => (profile.value?.accountName || 'u').trim().charAt(0).toUpperCase() || '?')
const canFollow = computed(() => !!auth.user && !!profile.value && !profile.value.isSelf)

watch(error, (message) => {
  if (!message) return
  toast.error(message)
  error.value = ''
})

function fmt(ts) {
  return new Date(ts).toLocaleDateString(undefined, {
    year: 'numeric',
    month: '2-digit',
    day: '2-digit',
  })
}

function displayNameOf(tierList) {
  return tierList.authorName || profileDisplayName.value
}

function avatarSrcOf(tierList) {
  return tierList.authorAvatarSrc ? toApiUrl(tierList.authorAvatarSrc) : profileAvatarUrl.value
}

function avatarFallbackOf(tierList) {
  return (tierList.authorAccountName || profile.value?.accountName || 'u').trim().charAt(0).toUpperCase() || '?'
}

function tierListThumbnailUrl(tierList) {
  if (!tierList?.id || brokenThumbnailIds.value[tierList.id]) return ''
  return tierList.thumbnailSrc ? toApiUrl(tierList.thumbnailSrc) : ''
}

function handleThumbnailError(tierListId) {
  if (!tierListId || brokenThumbnailIds.value[tierListId]) return
  brokenThumbnailIds.value = { ...brokenThumbnailIds.value, [tierListId]: true }
}

async function loadProfile() {
  isLoading.value = true
  try {
    if (!auth.hydrated) await auth.refresh()
    const [profileRes, tierListsRes] = await Promise.all([
      api.getUserProfile(userId.value),
      api.listUserPublicTierLists(userId.value, { q: query.value }),
    ])
    profile.value = profileRes.user || null
    tierLists.value = tierListsRes.tierLists || []
    brokenThumbnailIds.value = {}
  } catch (e) {
    error.value = '작성자 프로필을 불러오지 못했어요.'
    profile.value = null
    tierLists.value = []
  } finally {
    isLoading.value = false
  }
}

async function toggleFollow() {
  if (!canFollow.value || !profile.value?.id || isFollowBusy.value) return
  try {
    isFollowBusy.value = true
    const data = profile.value.isFollowing
      ? await api.unfollowUser(profile.value.id)
      : await api.followUser(profile.value.id)
    profile.value = data.user || profile.value
    toast.success(profile.value.isFollowing ? '팔로우했어요.' : '팔로우를 해제했어요.')
  } catch (e) {
    if (e?.status === 401) {
      router.push(loginPath(route.fullPath))
      return
    }
    error.value = '팔로우 상태를 변경하지 못했어요.'
  } finally {
    isFollowBusy.value = false
  }
}

function openTierList(tierList) {
  router.push(editorPath(tierList.topicSlug || tierList.topicId, tierList.id))
}

watch(userId, loadProfile, { immediate: true })
</script>

<template>
  <section class="pageWrap">
    <section class="pageHead">
      <div class="pageHead__main">
        <div class="pageHead__eyebrow">User Profile</div>
        <h2 class="pageHead__title">사용자 프로필</h2>
        <div class="pageHead__desc">
          이 사용자가 공개한 티어표를 모아볼 수 있어요.
        </div>
      </div>
      <div class="pageHead__aside profileActions">
        <button v-if="canFollow" class="btn btn--primary" :disabled="isFollowBusy" type="button" @click="toggleFollow">
          {{ profile?.isFollowing ? '팔로잉' : '팔로우' }}
        </button>
        <button v-if="auth.user" class="btn" type="button" @click="router.push(followingFeedPath())">팔로우 피드</button>
      </div>
    </section>

    <section class="profileHero">
      <div class="profileCard">
        <img v-if="profileAvatarUrl" class="profileAvatar" :src="profileAvatarUrl" :alt="profileDisplayName" draggable="false" />
        <div v-else class="profileAvatar profileAvatar--fallback">{{ profileFallback }}</div>
        <div class="profileMeta">
          <div class="profileMeta__name">{{ profileDisplayName }}</div>
        </div>
      </div>
      <div class="profileStats">
        <article class="profileStat">
          <span class="profileStat__label">공개 티어표</span>
          <strong class="profileStat__value">{{ profile?.publicTierListCount || 0 }}</strong>
        </article>
        <article class="profileStat">
          <span class="profileStat__label">팔로워</span>
          <strong class="profileStat__value">{{ profile?.followerCount || 0 }}</strong>
        </article>
        <article class="profileStat">
          <span class="profileStat__label">팔로잉</span>
          <strong class="profileStat__value">{{ profile?.followingCount || 0 }}</strong>
        </article>
      </div>
    </section>

    <section class="listToolbar">
      <input v-model="query" class="input" placeholder="이 작성자의 공개 티어표 검색" @keydown.enter.prevent="loadProfile" />
      <button class="btn" :disabled="isLoading" type="button" @click="loadProfile">{{ isLoading ? '검색중...' : '검색' }}</button>
    </section>

    <div v-if="isLoading" class="empty">작성자 티어표를 불러오고 있어요.</div>
    <div v-else-if="!tierLists.length" class="empty">아직 공개 티어표가 없어요.</div>
    <div v-else class="list">
      <article v-for="tierList in tierLists" :key="tierList.id" class="boardCard">
        <button class="boardCard__body" type="button" @click="openTierList(tierList)">
          <div class="boardCard__thumbWrap">
            <img
              v-if="tierListThumbnailUrl(tierList)"
              class="boardCard__thumb"
              :src="tierListThumbnailUrl(tierList)"
              :alt="tierList.title"
              draggable="false"
              @error="handleThumbnailError(tierList.id)"
            />
            <div v-else class="boardCard__thumbPlaceholder">대표 썸네일</div>
          </div>
          <div class="boardCard__head">
            <div class="boardCard__titleRow">
              <div class="boardCard__title">{{ tierList.title }}</div>
              <div class="favoriteStat">{{ tierList.isFavorited ? '♥' : '♡' }} {{ tierList.favoriteCount || 0 }}</div>
            </div>
            <div class="boardCard__metaRow">
              <div class="boardCard__author">
                <img
                  v-if="avatarSrcOf(tierList)"
                  class="boardCard__avatar"
                  :src="avatarSrcOf(tierList)"
                  :alt="displayNameOf(tierList)"
                  draggable="false"
                />
                <div v-else class="boardCard__avatar boardCard__avatar--fallback">{{ avatarFallbackOf(tierList) }}</div>
                <span class="boardCard__authorName">{{ displayNameOf(tierList) }}</span>
              </div>
              <div class="boardCard__date">{{ fmt(tierList.updatedAt) }}</div>
            </div>
          </div>
        </button>
      </article>
    </div>
  </section>
</template>

<style scoped>
.profileActions {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
}
.btn {
  padding: 11px 13px;
  border-radius: 14px;
  border: 1px solid var(--theme-border);
  background: var(--theme-surface-soft-2);
  color: var(--theme-text);
  font-weight: 800;
  cursor: pointer;
}
.btn--primary {
  border: 0;
  background: linear-gradient(135deg, #6366f1, #8b5cf6);
  color: #fff;
}
.profileHero {
  display: grid;
  grid-template-columns: minmax(0, 1fr) minmax(320px, 420px);
  gap: 18px;
  margin-bottom: 22px;
}
.profileCard,
.profileStat {
  border-radius: 24px;
  border: 1px solid var(--theme-card-border);
  background: var(--theme-card-bg);
  box-shadow: inset 0 1px 0 var(--theme-card-shadow);
}
.profileCard {
  padding: 24px;
  display: flex;
  align-items: center;
  gap: 18px;
  min-width: 0;
}
.profileAvatar {
  width: 82px;
  height: 82px;
  border-radius: 9999px;
  object-fit: cover;
  border: 1px solid var(--theme-avatar-border);
  background: var(--theme-border);
  flex: 0 0 auto;
}
.profileAvatar--fallback {
  display: grid;
  place-items: center;
  font-size: 28px;
  font-weight: 900;
}
.profileMeta {
  min-width: 0;
  display: grid;
  gap: 6px;
}
.profileMeta__name {
  font-size: 24px;
  font-weight: 900;
  color: var(--theme-text);
  word-break: break-word;
}
.profileStats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
}
.profileStat {
  padding: 18px;
  display: grid;
  gap: 8px;
  align-content: center;
}
.profileStat__label {
  font-size: 12px;
  font-weight: 800;
  color: var(--theme-text-faint);
}
.profileStat__value {
  font-size: 26px;
  font-weight: 900;
  color: var(--theme-text);
}
.listToolbar {
  display: flex;
  gap: 10px;
  flex-wrap: wrap;
  margin-bottom: 18px;
}
.input {
  min-width: 260px;
  padding: 11px 13px;
  border-radius: 14px;
  border: 1px solid var(--theme-border);
  background: var(--theme-surface-soft);
  color: var(--theme-text);
}
.empty {
  opacity: 0.76;
}
.list {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 18px;
}
.boardCard {
  min-width: 0;
  border-radius: 22px;
  border: 1px solid var(--theme-card-border);
  background: var(--theme-card-bg);
  color: var(--theme-text);
  overflow: hidden;
  box-shadow: inset 0 1px 0 var(--theme-card-shadow);
  transition:
    transform 0.16s ease,
    background 0.16s ease;
}
.boardCard:hover {
  background: var(--theme-card-bg-hover);
  transform: translateY(-2px);
}
.boardCard__body {
  width: 100%;
  min-width: 0;
  text-align: left;
  cursor: pointer;
  border: 0;
  background: transparent;
  color: inherit;
  padding: 0;
  display: grid;
}
.boardCard__thumbWrap {
  width: 100%;
  aspect-ratio: 16 / 9;
  padding: 14px 14px 0;
  box-sizing: border-box;
}
.boardCard__thumb,
.boardCard__thumbPlaceholder {
  width: 100%;
  height: 100%;
  border-radius: 18px;
  display: block;
}
.boardCard__thumb {
  object-fit: cover;
}
.boardCard__thumbPlaceholder {
  display: grid;
  place-items: center;
  background: var(--theme-thumb-fallback-bg);
  color: var(--theme-text-faint);
  font-size: 13px;
  font-weight: 700;
}
.boardCard__head {
  min-width: 0;
  padding: 16px 18px 18px;
  display: grid;
  gap: 8px;
}
.boardCard__titleRow,
.boardCard__metaRow {
  min-width: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 10px;
}
.boardCard__titleRow {
  align-items: flex-start;
}
.boardCard__metaRow {
  align-items: flex-end;
}
.boardCard__title {
  min-width: 0;
  font-weight: 800;
  font-size: 18px;
  line-height: 1.35;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  text-overflow: ellipsis;
  word-break: break-word;
}
.boardCard__author {
  min-width: 0;
  max-width: 100%;
  display: inline-flex;
  gap: 7px;
  align-items: center;
  font-size: 13px;
  opacity: 0.86;
  overflow: hidden;
}
.boardCard__authorName {
  min-width: 0;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.boardCard__avatar {
  width: 22px;
  height: 22px;
  border-radius: 9999px;
  object-fit: cover;
  border: 1px solid var(--theme-avatar-border);
  background: var(--theme-border);
  flex: 0 0 auto;
}
.boardCard__avatar--fallback {
  display: grid;
  place-items: center;
  font-size: 11px;
  font-weight: 900;
}
.boardCard__date,
.favoriteStat {
  flex: 0 0 auto;
  min-width: 0;
  max-width: 100%;
  font-size: 13px;
  color: var(--theme-text-faint);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.boardCard__date {
  font-size: 10px;
}
@media (max-width: 1400px) {
  .list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}
@media (max-width: 1200px) {
  .profileHero {
    grid-template-columns: 1fr;
  }

  .list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (max-width: 720px) {
  .profileCard {
    padding: 18px;
  }

  .profileStats,
  .list {
    grid-template-columns: 1fr;
  }

  .input {
    min-width: 0;
    width: 100%;
  }
}
</style>
