// composables/useWikiTree.ts
export interface WikiPageItem {
    id: string
    parentId: string | null
    title: string
    isFolder: boolean
    sortOrder: number
    entityType?: string | null
    children?: WikiPageItem[]
}

export const useWikiTree = () => {
    const { $api } = useNuxtApp()

    // STATE
    const items = useState<WikiPageItem[]>('wiki-items', () => [])
    const isLoading = useState<boolean>('wiki-loading', () => false)

    // NEU: Globaler Sidebar State (Standardmäßig offen)
    const isSidebarOpen = useState<boolean>('wiki-sidebar-open', () => true)

    // COMPUTED: Tree Transformation
    const tree = computed(() => {
        const rawItems = items.value
        if (!rawItems || rawItems.length === 0) return []

        const roots: WikiPageItem[] = []
        const lookup: Record<string, WikiPageItem> = {}

        // Init Lookup
        rawItems.forEach(item => {
            lookup[item.id] = { ...item, children: [] }
        })

        // Build Tree
        rawItems.forEach(item => {
            const node = lookup[item.id]
            if (item.parentId && lookup[item.parentId]) {
                lookup[item.parentId].children?.push(node)
            } else {
                roots.push(node)
            }
        })

        // Sort
        const sortNodes = (nodes: WikiPageItem[]) => {
            nodes.sort((a, b) => {
                if (a.isFolder !== b.isFolder) return a.isFolder ? -1 : 1
                if (a.sortOrder !== b.sortOrder) return a.sortOrder - b.sortOrder
                return a.title.localeCompare(b.title)
            })
            nodes.forEach(node => {
                if (node.children?.length) sortNodes(node.children)
            })
        }

        sortNodes(roots)
        return roots
    })

    // ACTIONS
    const loadTree = async (params: { entityType?: string, entityId?: number, entityUuid?: string } = {}) => {
        isLoading.value = true
        try {
            const data = await $api<WikiPageItem[]>('/api/wiki/tree', {
                method: 'GET',
                query: params
            })
            items.value = data
        } catch (e) {
            console.error('Wiki Tree Load Error', e)
        } finally {
            isLoading.value = false
        }
    }

    return {
        tree,
        items,
        isLoading,
        isSidebarOpen, // Exportiert für Zugriff in Pages
        loadTree
    }
}