const REQUEST_TYPE_META = {
  travel: {
    label: '差旅费',
    detailVariant: 'travel',
    tone: 'travel',
    secondaryStatusLabel: '行程状态'
  },
  entertainment: {
    label: '业务招待费',
    detailVariant: 'general',
    tone: 'entertainment',
    secondaryStatusLabel: '票据状态'
  },
  hotel: {
    label: '住宿费',
    detailVariant: 'general',
    tone: 'travel',
    secondaryStatusLabel: '票据状态'
  },
  transport: {
    label: '交通费',
    detailVariant: 'general',
    tone: 'travel',
    secondaryStatusLabel: '票据状态'
  },
  meal: {
    label: '餐费',
    detailVariant: 'general',
    tone: 'meeting',
    secondaryStatusLabel: '票据状态'
  },
  office: {
    label: '办公费',
    detailVariant: 'general',
    tone: 'office',
    secondaryStatusLabel: '票据状态'
  },
  meeting: {
    label: '会务费',
    detailVariant: 'general',
    tone: 'meeting',
    secondaryStatusLabel: '票据状态'
  },
  training: {
    label: '培训费',
    detailVariant: 'general',
    tone: 'training',
    secondaryStatusLabel: '票据状态'
  },
  other: {
    label: '其他费用',
    detailVariant: 'general',
    tone: 'other',
    secondaryStatusLabel: '票据状态'
  }
}

const APPROVAL_META = {
  draft: { label: '草稿', tone: 'draft' },
  in_progress: { label: '审批中', tone: 'info' },
  supplement: { label: '待补充', tone: 'warning' },
  completed: { label: '已完成', tone: 'success' },
  rejected: { label: '已退回', tone: 'danger' }
}

const BACKEND_STATUS_META = {
  draft: { key: 'draft', label: '草稿', tone: 'draft' },
  submitted: { key: 'in_progress', label: '审批中', tone: 'info' },
  pending: { key: 'in_progress', label: '审批中', tone: 'info' },
  reviewing: { key: 'in_progress', label: '审批中', tone: 'info' },
  in_review: { key: 'in_progress', label: '审批中', tone: 'info' },
  in_progress: { key: 'in_progress', label: '审批中', tone: 'info' },
  approved: { key: 'completed', label: '已完成', tone: 'success' },
  paid: { key: 'completed', label: '已完成', tone: 'success' },
  completed: { key: 'completed', label: '已完成', tone: 'success' },
  supplement: { key: 'supplement', label: '待补充', tone: 'warning' },
  returned: { key: 'supplement', label: '待提交', tone: 'warning' },
  rejected: { key: 'rejected', label: '已退回', tone: 'danger' },
  cancelled: { key: 'rejected', label: '已退回', tone: 'danger' }
}

function parseRequestDateFromId(id) {
  const match = String(id || '').match(/(\d{4})[-]?(\d{2})(\d{2})/)

  if (!match) {
    return ''
  }

  const [, year, month, day] = match
  return `${year}-${month}-${day}`
}

function parseAmount(value) {
  if (typeof value === 'number' && Number.isFinite(value)) {
    return value
  }

  const normalized = String(value || '')
    .replace(/[，,\s]/g, '')
    .replace(/[¥￥]/g, '')
    .replace(/元/g, '')
    .trim()

  if (!normalized || !/^-?\d+(?:\.\d+)?$/.test(normalized)) {
    return null
  }

  const amount = Number(normalized)
  return Number.isFinite(amount) ? amount : null
}

export function formatRequestCurrency(value) {
  const amount = parseAmount(value)
  if (amount === null) {
    return String(value || '').trim() || '待补充'
  }

  return new Intl.NumberFormat('zh-CN', {
    style: 'currency',
    currency: 'CNY',
    minimumFractionDigits: 0,
    maximumFractionDigits: Number.isInteger(amount) ? 0 : 2
  }).format(amount)
}

function resolveApprovalState(request) {
  const normalizedStatus = String(request?.status || '').trim().toLowerCase()

  if (normalizedStatus && BACKEND_STATUS_META[normalizedStatus]) {
    const meta = BACKEND_STATUS_META[normalizedStatus]
    return {
      key: meta.key,
      label: request.approvalStatus || request.approval || meta.label,
      tone: request.approvalTone || meta.tone
    }
  }

  if (request?.approvalKey && APPROVAL_META[request.approvalKey]) {
    return {
      key: request.approvalKey,
      label: request.approvalStatus || request.approval || APPROVAL_META[request.approvalKey].label,
      tone: request.approvalTone || APPROVAL_META[request.approvalKey].tone
    }
  }

  if (typeof request?.approval === 'string' && request.approval.trim()) {
    return {
      key: request.approvalKey || 'in_progress',
      label: request.approval,
      tone: request.approvalTone || 'info'
    }
  }

  if (typeof request?.status === 'string') {
    if (request.status === 'success') return { key: 'completed', label: '已完成', tone: 'success' }
    if (request.status === 'danger') return { key: 'supplement', label: '待补充', tone: 'warning' }
  }

  return { key: 'in_progress', label: '审批中', tone: 'info' }
}

function resolveTypeMeta(request) {
  const typeCode = String(request?.typeCode || request?.expense_type || '').trim() || 'other'
  const typeMeta = REQUEST_TYPE_META[typeCode] || REQUEST_TYPE_META.other

  return {
    typeCode,
    typeLabel: String(request?.typeLabel || request?.category || '').trim() || typeMeta.label,
    detailVariant: String(request?.detailVariant || '').trim() || typeMeta.detailVariant,
    typeTone: typeMeta.tone,
    secondaryStatusLabel: request?.secondaryStatusLabel || typeMeta.secondaryStatusLabel
  }
}

function normalizeRoleLabels(value) {
  if (Array.isArray(value)) {
    return value.map((item) => String(item || '').trim()).filter(Boolean)
  }

  const text = String(value || '').trim()
  return text ? [text] : []
}

export function normalizeRequestForUi(request) {
  if (!request) {
    return null
  }

  const { typeCode, typeLabel, detailVariant, typeTone, secondaryStatusLabel } = resolveTypeMeta(request)
  const approvalState = resolveApprovalState(request)
  const amountValue = parseAmount(request.amount)
  const amountDisplay = formatRequestCurrency(amountValue ?? request.amount)
  const title = String(request.title || request.reason || '').trim() || `${typeLabel}报销`
  const sceneTarget = String(request.sceneTarget || request.location || request.city || request.entity || '').trim() || '待补充'
  const occurredDisplay = String(request.occurredDisplay || request.period || request.occurredAt || '').trim() || '待补充'
  const applyTime = String(request.applyTime || parseRequestDateFromId(request.id) || '').trim() || '待补充'
  const workflowNode = String(
    request.workflowNode
    || request.node
    || request.approval_stage
    || request.approvalStage
    || ''
  ).trim() || '待提交'
  const secondaryStatusValue =
    String(request.secondaryStatusValue || request.travel || '').trim()
    || (detailVariant === 'travel' ? '待安排行程' : '待补充票据')
  const secondaryStatusTone = String(request.secondaryStatusTone || request.travelTone || '').trim() || 'neutral'
  const roleLabels = normalizeRoleLabels(request.roleLabels || request.role_labels)
  const profileIdentity =
    String(request.profileIdentity || request.employeeIdentity || request.identity || '').trim()
    || roleLabels.join(' / ')
    || '员工'

  return {
    ...request,
    claimId: String(request.claimId || request.claim_id || '').trim(),
    documentNo: String(request.documentNo || request.claimNo || request.claim_no || request.id || '').trim(),
    typeCode,
    typeLabel,
    detailVariant,
    typeTone,
    title,
    reason: title,
    sceneLabel: String(request.sceneLabel || '').trim() || typeLabel,
    sceneTarget,
    city: sceneTarget,
    location: String(request.location || '').trim() || sceneTarget,
    relatedCustomer: String(request.relatedCustomer || '').trim() || '待补充',
    occurredDisplay,
    period: occurredDisplay,
    applyTime,
    amountValue,
    amountDisplay,
    amount: amountDisplay,
    workflowNode,
    node: workflowNode,
    approvalKey: approvalState.key,
    approvalStatus: approvalState.label,
    approval: approvalState.label,
    approvalTone: approvalState.tone,
    secondaryStatusLabel,
    secondaryStatusValue,
    secondaryStatusTone,
    travel: secondaryStatusValue,
    travelTone: secondaryStatusTone,
    riskSummary: String(request.riskSummary || request.risk || '').trim() || '暂无异常',
    attachmentSummary: String(request.attachmentSummary || '').trim() || '待补充',
    rangeBucket: String(request.rangeBucket || request.range || '').trim() || '本周',
    detailTitle: String(request.detailTitle || '').trim() || title,
    note: String(request.note || '').trim(),
    profileName: String(request.person || request.applicant || request.employeeName || '').trim() || '当前申请人',
    profileDepartment: String(request.dept || request.department || request.departmentName || '').trim() || '所属部门',
    profileIdentity,
    profilePosition:
      String(request.profilePosition || request.employeePosition || request.employee_position || request.position || '').trim()
      || '待补充',
    profileGrade: String(request.profileGrade || request.employeeGrade || request.employee_grade || request.grade || '').trim() || '待补充',
    profileManager: String(request.profileManager || request.managerName || request.manager_name || request.manager || '').trim() || '待补充',
    roleLabels,
    profileAvatar:
      String(request.person || request.applicant || request.employeeName || '申').trim().slice(0, 1) || '申'
  }
}