<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">
        <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">
          <button
              @click="createNewPage"
              class="p-1.5 text-gray-500 hover:text-primary-600 rounded hover:bg-gray-100 transition-colors"
              title="Neue Seite erstellen"
          >
            <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>

          <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 die erste Notiz!
          </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 WikiTreeItem from '~/components/wiki/TreeItem.vue'
import WikiEditor from '~/components/wiki/WikiEditor.vue'

// --- SETUP & STATE ---
const route = useRoute()
const router = useRouter()
const { $api } = useNuxtApp()
const { tree, isLoading: isLoadingTree, loadTree, isSidebarOpen } = useWikiTree()

// ID aus der URL lesen
const pageId = computed(() => route.params.id as string | undefined)

// Editor State
const isSaving = ref(false)
const lastSaved = ref(false)
const saveTimeout = ref<any>(null)
const contentBuffer = ref(null)

// --- INITIAL LOAD ---
onMounted(() => {
  loadTree()
})

// Wenn sich die ID ändert, Speicher-Timer zurücksetzen!
watch(pageId, () => {
  if (saveTimeout.value) clearTimeout(saveTimeout.value)
  isSaving.value = false
})

// --- PAGE CONTENT LOAD ---
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 // Initiale Daten setzen
      return res
    },
    {
      watch: [pageId],
      immediate: true
    }
)

// --- ACTIONS ---

async function createNewPage() {
  const title = prompt("Name der neuen Seite:", "Neue Notiz")
  if (!title) return

  try {
    const newPage = await $api('/api/wiki', {
      method: 'POST',
      body: {
        title,
        parentId: null,
        isFolder: false,
        entityType: null
      }
    })

    await loadTree()

    // @ts-ignore
    if (newPage?.id) {
      // @ts-ignore
      router.push(`/wiki/${newPage.id}`)
    }
  } catch (e) {
    // Fehlerhandling durch Plugin
  }
}

// Titel speichern (sofort bei Blur)
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() // Baum aktualisieren für neuen Titel
    showSavedFeedback()
  } finally {
    isSaving.value = false
  }
}

// Inhalt speichern (Debounce)
function handleContentChange(newContent: any) {
  // WICHTIG: Hier habe ich die strikte JSON Prüfung entfernt, die das Speichern blockiert hat.

  contentBuffer.value = newContent
  isSaving.value = true
  lastSaved.value = false

  // Alten Timer löschen
  if (saveTimeout.value) clearTimeout(saveTimeout.value)

  // Neuen Timer starten
  saveTimeout.value = setTimeout(async () => {
    // Sicherheitscheck: Sind wir noch auf der gleichen Seite?
    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>