/**
 * Machine detail — document management sub-composable.
 *
 * Handles document loading, upload, delete and preview state.
 */

import { ref, computed } from 'vue'
import { useDocuments } from '~/composables/useDocuments'
import { canPreviewDocument } from '~/utils/documentPreview'

type AnyRecord = Record<string, unknown>

interface MachineDetailDocumentsDeps {
  machine: Ref<AnyRecord | null>
}

export function useMachineDetailDocuments(deps: MachineDetailDocumentsDeps) {
  const { machine } = deps
  const {
    uploadDocuments,
    deleteDocument,
    loadDocumentsByMachine,
    loadDocumentsByProduct,
  } = useDocuments()

  // ---------------------------------------------------------------------------
  // State
  // ---------------------------------------------------------------------------

  const machineDocumentFiles = ref<File[]>([])
  const machineDocumentsUploading = ref(false)
  const machineDocumentsLoaded = ref(false)
  const previewDocument = ref<AnyRecord | null>(null)
  const previewVisible = ref(false)

  // ---------------------------------------------------------------------------
  // Computed
  // ---------------------------------------------------------------------------

  const machineDocumentsList = computed(
    () => ((machine.value as AnyRecord)?.documents as AnyRecord[]) || [],
  )

  // ---------------------------------------------------------------------------
  // Methods
  // ---------------------------------------------------------------------------

  const refreshMachineDocuments = async () => {
    if (!machine.value?.id) return
    const result: any = await loadDocumentsByMachine(machine.value.id as string, { updateStore: false })
    if (result.success && machine.value) {
      machine.value.documents = result.data || []
      machineDocumentsLoaded.value = true
    }
  }

  const handleMachineFilesAdded = async (files: File[]) => {
    if (!files.length || !machine.value?.id) return
    machineDocumentsUploading.value = true
    try {
      const result: any = await uploadDocuments(
        { files, context: { machineId: machine.value.id } } as any,
        { updateStore: false },
      )
      if (result.success && machine.value) {
        const newDocs = (result.data as AnyRecord[]) || []
        machine.value.documents = [
          ...newDocs,
          ...((machine.value.documents as AnyRecord[]) || []),
        ]
        machineDocumentFiles.value = []
      }
    } finally {
      machineDocumentsUploading.value = false
    }
  }

  const removeMachineDocument = async (documentId: string) => {
    if (!documentId) return
    const result: any = await deleteDocument(documentId, { updateStore: false })
    if (result.success && machine.value) {
      machine.value.documents = ((machine.value.documents as AnyRecord[]) || []).filter(
        (doc) => doc.id !== documentId,
      )
    }
  }

  const openPreview = (doc: AnyRecord) => {
    if (!canPreviewDocument(doc)) return
    previewDocument.value = doc
    previewVisible.value = true
  }

  const closePreview = () => {
    previewVisible.value = false
    previewDocument.value = null
  }

  const loadProductDocuments = async (machineProductLinks: AnyRecord[]) => {
    const productIds = machineProductLinks
      .map((link) => {
        const p = link.product as AnyRecord | string | null
        if (typeof p === 'string') return p.split('/').pop() || null
        return (p as AnyRecord)?.id as string | null
      })
      .filter((id): id is string => !!id)

    const results = await Promise.allSettled(
      productIds.map(async (id) => {
        const result: any = await loadDocumentsByProduct(id, { updateStore: false })
        if (result.success && Array.isArray(result.data)) {
          return { id, docs: result.data as AnyRecord[] }
        }
        return { id, docs: [] }
      }),
    )

    const map = new Map<string, AnyRecord[]>()
    results.forEach((r) => {
      if (r.status === 'fulfilled' && r.value.docs.length) {
        map.set(r.value.id, r.value.docs)
      }
    })
    return map
  }

  return {
    // State
    machineDocumentFiles,
    machineDocumentsUploading,
    machineDocumentsLoaded,
    previewDocument,
    previewVisible,

    // Computed
    machineDocumentsList,

    // Methods
    refreshMachineDocuments,
    handleMachineFilesAdded,
    removeMachineDocument,
    openPreview,
    closePreview,
    loadProductDocuments,
  }
}