<template>
  <div class="flex h-full w-full bg-white overflow-hidden relative">

    <aside
        class="flex flex-col border-r border-gray-200 bg-gray-50/50 transition-all duration-300 ease-in-out overflow-hidden whitespace-nowrap h-full"
        :class="[isSidebarOpen ? 'w-80 min-w-[20rem] translate-x-0' : 'w-0 min-w-0 -translate-x-full opacity-0 border-none']"
    >

      <div class="flex items-center justify-between border-b border-gray-200 px-4 py-3 bg-white h-14 shrink-0 relative z-20">
        <h2 class="font-semibold text-gray-800 flex items-center gap-2">
          <span class="text-primary-600">📚</span> Wiki
        </h2>

        <div class="flex items-center gap-1">

          <div class="relative">
            <button
                @click.stop="showRootMenu = !showRootMenu"
                class="p-1.5 text-gray-500 hover:text-primary-600 rounded hover:bg-gray-100 transition-colors"
                :class="{ 'bg-gray-100 text-primary-600': showRootMenu }"
                title="Neu..."
            >
              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="w-5 h-5"><path d="M10.75 4.75a.75.75 0 00-1.5 0v4.5h-4.5a.75.75 0 000 1.5h4.5v4.5a.75.75 0 001.5 0v-4.5h4.5a.75.75 0 000-1.5h-4.5v-4.5z" /></svg>
            </button>

            <div v-if="showRootMenu" v-on-click-outside="() => showRootMenu = false" class="absolute right-0 top-full mt-1 w-40 bg-white rounded-md shadow-lg border border-gray-100 py-1 text-xs text-gray-700 animate-in fade-in slide-in-from-top-1 duration-100 origin-top-right">
              <button @click="createRootItem(false)" class="w-full text-left px-3 py-2 hover:bg-gray-50 flex items-center gap-2">
                <svg class="w-3 h-3 text-gray-400" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M9 13h6m-3-3v6m5 5H7a2 2 0 01-2-2V5a2 2 0 012-2h5.586a1 1 0 01.707.293l5.414 5.414a1 1 0 01.293.707V19a2 2 0 01-2 2z" /></svg>
                Neue Seite
              </button>
              <button @click="createRootItem(true)" class="w-full text-left px-3 py-2 hover:bg-gray-50 flex items-center gap-2">
                <svg class="w-3 h-3 text-yellow-500" fill="none" viewBox="0 0 24 24" stroke="currentColor"><path stroke-linecap="round" stroke-linejoin="round" stroke-width="2" d="M3 7v10a2 2 0 002 2h14a2 2 0 002-2V9a2 2 0 00-2-2h-6l-2-2H5a2 2 0 00-2 2z" /></svg>
                Neuer Ordner
              </button>
            </div>
          </div>

          <button
              @click="isSidebarOpen = false"
              class="p-1.5 text-gray-400 hover:text-gray-700 rounded hover:bg-gray-100 transition-colors ml-1"
              title="Sidebar einklappen"
          >
            <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="w-5 h-5"><path fill-rule="evenodd" d="M15.79 14.77a.75.75 0 01-1.06.02l-4.5-4.25a.75.75 0 010-1.08l4.5-4.25a.75.75 0 111.04 1.08L11.832 10l3.938 3.71a.75.75 0 01.02 1.06zm-6 0a.75.75 0 01-1.06.02l-4.5-4.25a.75.75 0 010-1.08l4.5-4.25a.75.75 0 111.04 1.08L5.832 10l3.938 3.71a.75.75 0 01.02 1.06z" clip-rule="evenodd" /></svg>
          </button>
        </div>
      </div>

      <div class="flex-1 overflow-y-auto px-2 py-3 custom-scrollbar">
        <div v-if="isLoadingTree && !tree.length" class="space-y-2 px-2 mt-2">
          <div class="h-4 w-3/4 bg-gray-200 animate-pulse rounded"></div>
          <div class="h-4 w-1/2 bg-gray-200 animate-pulse rounded"></div>
        </div>

        <div v-else>
          <WikiTreeItem v-for="node in tree" :key="node.id" :item="node" />

          <div v-if="!tree.length" class="text-center text-sm text-gray-400 mt-10 px-4">
            Keine Seiten.<br>Erstelle den ersten Ordner oben rechts!
          </div>
        </div>
      </div>
    </aside>


    <main class="flex-1 overflow-hidden relative bg-white h-full flex flex-col min-w-0">

      <div v-if="pageId && page" class="flex flex-col h-full">
        <header class="px-8 pt-8 pb-4 flex flex-col gap-2 shrink-0">
          <div class="flex items-center gap-3 w-full">
            <button
                v-show="!isSidebarOpen"
                @click="isSidebarOpen = true"
                class="p-2 -ml-2 text-gray-400 hover:text-primary-600 hover:bg-gray-100 rounded transition-colors shrink-0"
                title="Sidebar öffnen"
            >
              <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="w-6 h-6"><path fill-rule="evenodd" d="M4 10a.75.75 0 01.75-.75h7.5a.75.75 0 010 1.5h-7.5A.75.75 0 014 10z" clip-rule="evenodd" /><path fill-rule="evenodd" d="M4 6a.75.75 0 01.75-.75h11.5a.75.75 0 010 1.5H4.75A.75.75 0 014 6z" clip-rule="evenodd" /><path fill-rule="evenodd" d="M4 14a.75.75 0 01.75-.75h11.5a.75.75 0 010 1.5H4.75A.75.75 0 014 14z" clip-rule="evenodd" /></svg>
            </button>

            <input
                v-model="page.title"
                @blur="saveTitle"
                @keydown.enter="($event.target as HTMLInputElement).blur()"
                class="text-4xl font-bold text-gray-900 w-full outline-none placeholder-gray-300 bg-transparent min-w-0"
                placeholder="Unbenannte Seite"
            />
          </div>

          <div class="flex items-center gap-4 text-xs text-gray-400 h-6 ml-0.5">
            <span>{{ new Date(page.createdAt).toLocaleDateString() }}</span>
            <transition name="fade">
              <span v-if="isSaving" class="text-primary-600 flex items-center gap-1">
                <svg class="animate-spin h-3 w-3" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path></svg>
                Speichert...
              </span>
              <span v-else-if="lastSaved" class="text-green-600">Gespeichert</span>
            </transition>
          </div>
        </header>

        <div class="flex-1 overflow-hidden border-t border-gray-100">
          <WikiEditor v-model="contentBuffer" @update:modelValue="handleContentChange" />
        </div>
      </div>

      <div v-else-if="pageId && pendingPage" class="flex h-full items-center justify-center text-gray-400">
        <div class="flex flex-col items-center gap-2">
          <svg class="animate-spin h-8 w-8 text-gray-300" xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24"><circle class="opacity-25" cx="12" cy="12" r="10" stroke="currentColor" stroke-width="4"></circle><path class="opacity-75" fill="currentColor" d="M4 12a8 8 0 018-8V0C5.373 0 0 5.373 0 12h4z"></path></svg>
          <span>Lade Seite...</span>
        </div>
      </div>

      <div v-else class="flex h-full flex-col items-center justify-center text-gray-400 bg-gray-50/30">
        <button
            v-if="!isSidebarOpen"
            @click="isSidebarOpen = true"
            class="absolute left-4 top-4 p-2 bg-white border shadow-sm rounded-md hover:bg-gray-50"
        >
          <svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 20 20" fill="currentColor" class="w-5 h-5"><path fill-rule="evenodd" d="M4 10a.75.75 0 01.75-.75h7.5a.75.75 0 010 1.5h-7.5A.75.75 0 014 10z" clip-rule="evenodd" /><path fill-rule="evenodd" d="M4 6a.75.75 0 01.75-.75h11.5a.75.75 0 010 1.5H4.75A.75.75 0 014 6z" clip-rule="evenodd" /><path fill-rule="evenodd" d="M4 14a.75.75 0 01.75-.75h11.5a.75.75 0 010 1.5H4.75A.75.75 0 014 14z" clip-rule="evenodd" /></svg>
        </button>

        <div class="bg-gray-100 p-6 rounded-full mb-4">
          <svg xmlns="http://www.w3.org/2000/svg" fill="none" viewBox="0 0 24 24" stroke-width="1.5" stroke="currentColor" class="w-12 h-12 text-gray-400"><path stroke-linecap="round" stroke-linejoin="round" d="M12 6.042A8.967 8.967 0 006 3.75c-1.052 0-2.062.18-3 .512v14.25A8.987 8.987 0 016 18c2.305 0 4.408.867 6 2.292m0-14.25a8.966 8.966 0 016-2.292c1.052 0 2.062.18 3 .512v14.25A8.987 8.987 0 0018 18a8.967 8.967 0 00-6 2.292m0-14.25v14.25" /></svg>
        </div>
        <p class="text-lg font-medium text-gray-600">Keine Seite ausgewählt</p>
        <p class="text-sm mt-1">Wähle eine Notiz aus der Navigation.</p>
      </div>

    </main>
  </div>
</template>

<script setup lang="ts">
import { vOnClickOutside } from '@vueuse/components' // Import für Click-Outside
import WikiTreeItem from '~/components/wiki/TreeItem.vue'
import WikiEditor from '~/components/wiki/WikiEditor.vue'

const route = useRoute()
const router = useRouter()
const { $api } = useNuxtApp()
const { tree, isLoading: isLoadingTree, loadTree, isSidebarOpen, createItem } = useWikiTree()

const pageId = computed(() => route.params.id as string | undefined)

// UI States
const showRootMenu = ref(false)
const isSaving = ref(false)
const lastSaved = ref(false)
const saveTimeout = ref<any>(null)
const contentBuffer = ref(null)

onMounted(() => loadTree())

watch(pageId, () => {
  if (saveTimeout.value) clearTimeout(saveTimeout.value)
  isSaving.value = false
  lastSaved.value = false
})

const { data: page, pending: pendingPage } = await useAsyncData(
    () => `wiki-page-${pageId.value}`,
    async () => {
      if (!pageId.value) return null
      const res = await $api<any>(`/api/wiki/${pageId.value}`)
      contentBuffer.value = res.content
      return res
    },
    { watch: [pageId], immediate: true }
)

// --- ACTIONS ---

async function createRootItem(isFolder: boolean) {
  showRootMenu.value = false // Menü schließen
  const type = isFolder ? "Ordner" : "Seite"
  const title = prompt(`Name für neuen Root-${type}:`, `Neuer ${type}`)
  if (!title) return

  const newItem = await createItem(title, null, isFolder)

  // Nur bei Seiten navigieren wir, Ordner bleiben in der Struktur
  // @ts-ignore
  if (newItem && !isFolder) {
    // @ts-ignore
    router.push(`/wiki/${newItem.id}`)
  }
}

async function saveTitle() {
  if (!page.value || !pageId.value) return
  isSaving.value = true
  try {
    await $api(`/api/wiki/${pageId.value}`, { method: 'PATCH', body: { title: page.value.title } })
    loadTree()
    showSavedFeedback()
  } finally { isSaving.value = false }
}

function handleContentChange(newContent: any) {
  contentBuffer.value = newContent
  isSaving.value = true
  lastSaved.value = false
  if (saveTimeout.value) clearTimeout(saveTimeout.value)
  saveTimeout.value = setTimeout(async () => {
    if (!pageId.value) return
    try {
      await $api(`/api/wiki/${pageId.value}`, { method: 'PATCH', body: { content: contentBuffer.value } })
      showSavedFeedback()
    } catch (e) { console.error(e) } finally { isSaving.value = false }
  }, 1000)
}

function showSavedFeedback() {
  lastSaved.value = true
  setTimeout(() => { lastSaved.value = false }, 2000)
}
</script>

<style scoped>
.custom-scrollbar::-webkit-scrollbar { width: 4px; }
.custom-scrollbar::-webkit-scrollbar-track { background: transparent; }
.custom-scrollbar::-webkit-scrollbar-thumb { background-color: #e5e7eb; border-radius: 10px; }

.fade-enter-active, .fade-leave-active { transition: opacity 0.5s; }
.fade-enter-from, .fade-leave-to { opacity: 0; }
</style>