import { computed, ref } from 'vue'

import {
  DATE_INPUT_FORMAT,
  REVIEW_CATEGORY_PRESET_OPTIONS,
  REVIEW_OTHER_CATEGORY_OPTIONS,
  REVIEW_SCENE_OTHER_OPTION,
  buildInlineReviewChangedLines,
  buildInlineReviewState,
  buildReviewCategoryOptions,
  buildReviewDocumentDrafts,
  buildReviewDocumentSummaries,
  buildReviewPanelConfidence,
  buildReviewRecognitionNotes,
  buildReviewRecognizedLines,
  cloneReviewDocumentDrafts,
  cloneReviewEditFields,
  createEmptyInlineReviewState,
  extractAmountInputValue,
  formatConfidenceLabel,
  isValidIsoDateString,
  normalizeAmountValue,
  normalizeReviewDocumentComparableValue,
  resolveReviewCategoryConfidenceScore
} from './travelReimbursementReviewModel.js'

export function useTravelReimbursementReviewDrawer({
  activeReviewPayload,
  reviewFilePreviews,
  flowSteps,
  submitting,
  reviewActionBusy,
  triggerFileUpload,
  resolveDocumentPreview,
  buildReviewFactCards,
  buildReviewRiskItems,
  buildReviewRiskSummary,
  buildReviewIntentText,
  resolveReviewRiskBriefs,
  reviewDrawerMode: externalReviewDrawerMode,
  REVIEW_DRAWER_MODE_REVIEW,
  REVIEW_DRAWER_MODE_DOCUMENTS,
  REVIEW_DRAWER_MODE_RISK,
  REVIEW_DRAWER_MODE_FLOW
}) {
  const reviewInlineForm = ref(createEmptyInlineReviewState())
  const reviewInlineBaseForm = ref(createEmptyInlineReviewState())
  const reviewInlineBaseFields = ref([])
  const reviewInlinePendingFiles = ref([])
  const reviewInlineEditorKey = ref('')
  const reviewInlineErrors = ref({})
  const reviewOtherCategoryOpen = ref(false)
  const reviewDocumentDrafts = ref([])
  const reviewDocumentBaseDrafts = ref([])
  const activeReviewDocumentIndex = ref(0)
  const reviewDrawerMode = externalReviewDrawerMode || ref(REVIEW_DRAWER_MODE_REVIEW)
  const documentPreviewDialog = ref({
    open: false,
    filename: '',
    kind: 'file',
    url: ''
  })

  const activeReviewFilePreviews = computed(() => reviewFilePreviews.value)
  const reviewIntentText = computed(() => buildReviewIntentText(activeReviewPayload.value))
  const reviewFactCards = computed(() => buildReviewFactCards(activeReviewPayload.value, reviewInlineForm.value))
  const reviewCategoryOptions = computed(() =>
    buildReviewCategoryOptions(activeReviewPayload.value, reviewInlineForm.value.expense_type, reviewInlineForm.value)
  )
  const reviewOtherCategoryOptions = computed(() =>
    REVIEW_OTHER_CATEGORY_OPTIONS.map((item) => ({
      ...item,
      confidenceLabel: formatConfidenceLabel(
        resolveReviewCategoryConfidenceScore(activeReviewPayload.value, item.label, reviewInlineForm.value)
      )
    }))
  )
  const reviewSelectedOtherCategory = computed(() => {
    const presetLabels = REVIEW_CATEGORY_PRESET_OPTIONS.filter((item) => !item.is_other).map((item) => item.label)
    return presetLabels.includes(reviewInlineForm.value.expense_type) ? '' : reviewInlineForm.value.expense_type
  })
  const reviewInlineDirty = computed(
    () =>
      buildInlineReviewChangedLines(
        reviewInlineBaseForm.value,
        reviewInlineForm.value,
        reviewInlinePendingFiles.value
      ).length > 0
  )
  const reviewPanelConfidence = computed(() => buildReviewPanelConfidence(activeReviewPayload.value, reviewInlineForm.value))
  const reviewRiskSummary = computed(() => buildReviewRiskSummary(activeReviewPayload.value))
  const reviewRiskItems = computed(() => buildReviewRiskItems(activeReviewPayload.value))
  const reviewRiskEmpty = computed(() => !reviewRiskItems.value.length)
  const reviewDocumentCount = computed(() => reviewDocumentDrafts.value.length)
  const reviewDocumentDrawerAvailable = computed(() => reviewDocumentCount.value > 0)
  const reviewRiskDrawerAvailable = computed(() => !reviewRiskEmpty.value)
  const reviewFlowDrawerAvailable = computed(() => flowSteps.value.length > 0)
  const recognizedNarratives = computed(() => buildReviewRecognizedLines(activeReviewPayload.value))
  const reviewRecognitionNotes = computed(() => buildReviewRecognitionNotes(activeReviewPayload.value))
  const reviewDocumentSummaries = computed(() => buildReviewDocumentSummaries(activeReviewPayload.value))
  const isReviewDocumentDrawer = computed(() => reviewDrawerMode.value === REVIEW_DRAWER_MODE_DOCUMENTS)
  const isReviewRiskDrawer = computed(() => reviewDrawerMode.value === REVIEW_DRAWER_MODE_RISK)
  const isReviewFlowDrawer = computed(() => reviewDrawerMode.value === REVIEW_DRAWER_MODE_FLOW)
  const reviewDrawerTitle = computed(() => (
    isReviewDocumentDrawer.value
      ? '绁ㄦ嵁璇嗗埆缁撴灉'
      : isReviewRiskDrawer.value
        ? '椋庨櫓鎻愮ず'
        : isReviewFlowDrawer.value
          ? '璋冪敤娴佺▼'
          : '鎶ラ攢璇嗗埆鏍稿'
  ))
  const reviewDocumentDrawerLabel = computed(() => (
    '鍗曟嵁璇嗗埆'
  ))
  const reviewDocumentDrawerIcon = computed(() => (
    isReviewDocumentDrawer.value
      ? 'mdi mdi-file-document-multiple'
      : 'mdi mdi-file-document-multiple-outline'
  ))
  const reviewRiskDrawerLabel = computed(() => (
    '鏄剧ず椋庨櫓'
  ))
  const reviewRiskDrawerIcon = computed(() => (
    isReviewRiskDrawer.value
      ? 'mdi mdi-shield-alert'
      : 'mdi mdi-shield-alert-outline'
  ))
  const reviewFlowDrawerLabel = computed(() => (
    '璋冪敤娴佺▼'
  ))
  const reviewFlowDrawerIcon = computed(() => (
    isReviewFlowDrawer.value
      ? 'mdi mdi-timeline-clock'
      : 'mdi mdi-timeline-clock-outline'
  ))
  const activeReviewDocument = computed(() => reviewDocumentDrafts.value[activeReviewDocumentIndex.value] ?? null)
  const activeReviewDocumentPreview = computed(() =>
    activeReviewDocument.value
      ? (
          resolveDocumentPreview(activeReviewFilePreviews.value, activeReviewDocument.value.filename)
          || (
            activeReviewDocument.value.preview_kind === 'image' && activeReviewDocument.value.preview_data_url
              ? {
                  filename: activeReviewDocument.value.filename,
                  kind: activeReviewDocument.value.preview_kind,
                  url: activeReviewDocument.value.preview_data_url
                }
              : null
          )
        )
      : null
  )
  const canPreviewActiveReviewDocument = computed(() => Boolean(activeReviewDocumentPreview.value?.url))
  const reviewDocumentDirty = computed(() => {
    const baseValue = JSON.stringify(reviewDocumentBaseDrafts.value.map(normalizeReviewDocumentComparableValue))
    const nextValue = JSON.stringify(reviewDocumentDrafts.value.map(normalizeReviewDocumentComparableValue))
    return baseValue !== nextValue
  })
  const reviewHasUnsavedChanges = computed(() => reviewInlineDirty.value || reviewDocumentDirty.value)

  function resetReviewDrawerFromPayload(payload) {
    const normalizedInlineState = buildInlineReviewState(payload)
    reviewInlineForm.value = { ...normalizedInlineState }
    reviewInlineBaseForm.value = { ...normalizedInlineState }
    reviewInlineBaseFields.value = cloneReviewEditFields(payload?.edit_fields)
    const nextDocumentDrafts = buildReviewDocumentDrafts(payload)
    reviewDocumentDrafts.value = cloneReviewDocumentDrafts(nextDocumentDrafts)
    reviewDocumentBaseDrafts.value = cloneReviewDocumentDrafts(nextDocumentDrafts)
    activeReviewDocumentIndex.value = nextDocumentDrafts.length
      ? Math.min(activeReviewDocumentIndex.value, nextDocumentDrafts.length - 1)
      : 0
    reviewDrawerMode.value = resolveReviewRiskBriefs(payload).length
      ? REVIEW_DRAWER_MODE_RISK
      : REVIEW_DRAWER_MODE_REVIEW
    reviewInlinePendingFiles.value = []
    reviewInlineEditorKey.value = ''
    reviewInlineErrors.value = {}
    reviewOtherCategoryOpen.value = false
  }

  function setInlineReviewFieldError(key, message) {
    reviewInlineErrors.value = {
      ...reviewInlineErrors.value,
      [key]: String(message || '').trim()
    }
  }

  function clearInlineReviewFieldError(key) {
    if (!reviewInlineErrors.value[key]) {
      return
    }

    const nextErrors = { ...reviewInlineErrors.value }
    delete nextErrors[key]
    reviewInlineErrors.value = nextErrors
  }

  function openInlineReviewEditor(key) {
    if (!activeReviewPayload.value || submitting.value || reviewActionBusy.value) return
    if (key === 'attachments') {
      triggerFileUpload('inline-review')
      return
    }

    if (reviewInlineEditorKey.value && reviewInlineEditorKey.value !== key && !commitInlineReviewEditor()) {
      return
    }

    if (reviewInlineEditorKey.value === key) {
      commitInlineReviewEditor()
      return
    }

    if (key === 'amount') {
      reviewInlineForm.value = {
        ...reviewInlineForm.value,
        amount: extractAmountInputValue(reviewInlineForm.value.amount)
      }
    }

    clearInlineReviewFieldError(key)
    reviewInlineEditorKey.value = key
    if (key !== 'expense_type') {
      reviewOtherCategoryOpen.value = false
    }
  }

  function closeInlineReviewEditor() {
    reviewInlineEditorKey.value = ''
    reviewOtherCategoryOpen.value = false
  }

  function commitInlineReviewEditor() {
    const activeEditorKey = reviewInlineEditorKey.value
    const nextForm = {
      ...reviewInlineForm.value,
      occurred_date: String(reviewInlineForm.value.occurred_date || '').trim(),
      amount: String(reviewInlineForm.value.amount || '').trim(),
      transport_type: String(reviewInlineForm.value.transport_type || '').trim(),
      customer_name: String(reviewInlineForm.value.customer_name || '').trim(),
      location: String(reviewInlineForm.value.location || '').trim(),
      merchant_name: String(reviewInlineForm.value.merchant_name || '').trim(),
      participants: String(reviewInlineForm.value.participants || '').trim(),
      scene_label: String(reviewInlineForm.value.scene_label || '').trim(),
      reason_value: String(reviewInlineForm.value.reason_value || reviewInlineForm.value.scene_label || '').trim(),
      expense_type: String(reviewInlineForm.value.expense_type || '').trim()
    }

    if (
      activeEditorKey === 'scene' &&
      nextForm.scene_label === REVIEW_SCENE_OTHER_OPTION
    ) {
      nextForm.reason_value = String(reviewInlineForm.value.reason_value || '').trim()
      if (!nextForm.reason_value) {
        setInlineReviewFieldError('scene', '璇烽€夋嫨鈥滃叾浠栧満鏅€濆悗锛岃琛ュ厖鍏蜂綋浜嬬敱')
        reviewInlineForm.value = nextForm
        return false
      }
    } else if (activeEditorKey === 'scene') {
      nextForm.reason_value = nextForm.scene_label
    }

    if (activeEditorKey === 'occurred_date' && nextForm.occurred_date && !isValidIsoDateString(nextForm.occurred_date)) {
      setInlineReviewFieldError('occurred_date', `璇疯緭鍏ユ纭殑鏃堕棿鏍煎紡锛?{DATE_INPUT_FORMAT}`)
      return false
    }

    if (activeEditorKey === 'amount' && nextForm.amount) {
      const normalizedAmount = normalizeAmountValue(nextForm.amount)
      if (!normalizedAmount) {
        setInlineReviewFieldError('amount', '璇疯緭鍏ユ纭殑鏁板瓧閲戦锛屼緥濡?200 鎴?200.50')
        return false
      }
      nextForm.amount = normalizedAmount
    }

    if (activeEditorKey) {
      clearInlineReviewFieldError(activeEditorKey)
    }

    reviewInlineForm.value = nextForm
    reviewInlineEditorKey.value = ''
    return true
  }

  function selectInlineScene(scene) {
    const normalizedScene = String(scene || '').trim()
    reviewInlineForm.value = {
      ...reviewInlineForm.value,
      scene_label: normalizedScene,
      reason_value:
        normalizedScene === REVIEW_SCENE_OTHER_OPTION
          ? ''
          : normalizedScene
    }
    clearInlineReviewFieldError('scene')
    if (normalizedScene !== REVIEW_SCENE_OTHER_OPTION) {
      reviewInlineEditorKey.value = ''
    }
  }

  function selectReviewCategory(option) {
    if (!option) return
    if (option.is_other) {
      reviewOtherCategoryOpen.value = !reviewOtherCategoryOpen.value
      return
    }

    reviewInlineForm.value = {
      ...reviewInlineForm.value,
      expense_type: option.label
    }
    reviewOtherCategoryOpen.value = false
  }

  function selectReviewOtherCategory(option) {
    if (!option) return
    reviewInlineForm.value = {
      ...reviewInlineForm.value,
      expense_type: option.label
    }
    reviewOtherCategoryOpen.value = false
  }

  function goReviewDocument(direction) {
    const total = reviewDocumentCount.value
    if (!total) return
    const nextIndex = activeReviewDocumentIndex.value + Number(direction || 0)
    activeReviewDocumentIndex.value = Math.max(0, Math.min(total - 1, nextIndex))
  }

  function openActiveReviewDocumentPreview() {
    if (!activeReviewDocument.value || !activeReviewDocumentPreview.value?.url) return
    documentPreviewDialog.value = {
      open: true,
      filename: activeReviewDocument.value.filename,
      kind: activeReviewDocumentPreview.value.kind,
      url: activeReviewDocumentPreview.value.url
    }
  }

  function closeDocumentPreview() {
    documentPreviewDialog.value = {
      ...documentPreviewDialog.value,
      open: false
    }
  }

  function enforceReviewDrawerAvailability() {
    if (!reviewDocumentDrawerAvailable.value && reviewDrawerMode.value === REVIEW_DRAWER_MODE_DOCUMENTS) {
      reviewDrawerMode.value = REVIEW_DRAWER_MODE_REVIEW
    }
    if (!reviewRiskDrawerAvailable.value && reviewDrawerMode.value === REVIEW_DRAWER_MODE_RISK) {
      reviewDrawerMode.value = REVIEW_DRAWER_MODE_REVIEW
    }
    if (!reviewFlowDrawerAvailable.value && reviewDrawerMode.value === REVIEW_DRAWER_MODE_FLOW) {
      reviewDrawerMode.value = REVIEW_DRAWER_MODE_REVIEW
    }
  }

  return {
    reviewInlineForm,
    reviewInlineBaseForm,
    reviewInlineBaseFields,
    reviewInlinePendingFiles,
    reviewInlineEditorKey,
    reviewInlineErrors,
    reviewOtherCategoryOpen,
    reviewDocumentDrafts,
    reviewDocumentBaseDrafts,
    activeReviewDocumentIndex,
    reviewDrawerMode,
    documentPreviewDialog,
    activeReviewFilePreviews,
    reviewIntentText,
    reviewFactCards,
    reviewCategoryOptions,
    reviewOtherCategoryOptions,
    reviewSelectedOtherCategory,
    reviewInlineDirty,
    reviewPanelConfidence,
    reviewRiskSummary,
    reviewRiskItems,
    reviewRiskEmpty,
    reviewDocumentDrawerAvailable,
    reviewRiskDrawerAvailable,
    reviewFlowDrawerAvailable,
    recognizedNarratives,
    reviewRecognitionNotes,
    reviewDocumentSummaries,
    reviewDocumentCount,
    isReviewDocumentDrawer,
    isReviewRiskDrawer,
    isReviewFlowDrawer,
    reviewDrawerTitle,
    reviewDocumentDrawerLabel,
    reviewDocumentDrawerIcon,
    reviewRiskDrawerLabel,
    reviewRiskDrawerIcon,
    reviewFlowDrawerLabel,
    reviewFlowDrawerIcon,
    activeReviewDocument,
    activeReviewDocumentPreview,
    canPreviewActiveReviewDocument,
    reviewDocumentDirty,
    reviewHasUnsavedChanges,
    setInlineReviewFieldError,
    clearInlineReviewFieldError,
    resetReviewDrawerFromPayload,
    openInlineReviewEditor,
    closeInlineReviewEditor,
    commitInlineReviewEditor,
    selectInlineScene,
    selectReviewCategory,
    selectReviewOtherCategory,
    goReviewDocument,
    openActiveReviewDocumentPreview,
    closeDocumentPreview,
    enforceReviewDrawerAvailability
  }
}