import { apiRequest } from './api.js'
import {
  buildApplicationPreviewRows,
  buildApplicationPreviewSubmitText,
  normalizeApplicationPreview
} from '../utils/expenseApplicationPreview.js'

export const AI_APPLICATION_ACTION_SAVE_DRAFT = 'ai_application_save_draft'
export const AI_APPLICATION_ACTION_SUBMIT = 'ai_application_submit'

function normalizeText(value) {
  return String(value || '').trim()
}

function resolveUserValue(user = {}, ...keys) {
  for (const key of keys) {
    const value = normalizeText(user?.[key])
    if (value) return value
  }
  return ''
}

function buildClientTimeContext() {
  const now = new Date()
  const locale =
    typeof navigator !== 'undefined' && typeof navigator.language === 'string'
      ? navigator.language
      : 'zh-CN'

  return {
    client_now_iso: now.toISOString(),
    client_timezone_offset_minutes: now.getTimezoneOffset(),
    client_locale: locale
  }
}

function buildApplicationPreviewSaveText(preview = {}) {
  const rows = buildApplicationPreviewRows(preview)
  return [
    '费用申请保存草稿',
    ...rows.map((row) => `${row.label}：${row.value}`),
    '',
    '保存草稿'
  ].join('\n')
}

export function buildAiApplicationPreviewActionText(actionType, preview = {}) {
  const normalized = normalizeApplicationPreview(preview)
  return actionType === AI_APPLICATION_ACTION_SUBMIT
    ? buildApplicationPreviewSubmitText(normalized)
    : buildApplicationPreviewSaveText(normalized)
}

export function buildAiApplicationPreviewActionPayload({
  actionType,
  applicationPreview,
  currentUser = {},
  conversationId = '',
  draftPayload = null
} = {}) {
  const normalizedPreview = normalizeApplicationPreview(applicationPreview || {})
  const message = buildAiApplicationPreviewActionText(actionType, normalizedPreview)
  const username = resolveUserValue(currentUser, 'username', 'account', 'email', 'name') || 'anonymous'
  const name = resolveUserValue(currentUser, 'name', 'username')
  const employeeNo = resolveUserValue(currentUser, 'employeeNo', 'employee_no')
  const managerName = resolveUserValue(currentUser, 'managerName', 'manager_name', 'directManagerName', 'direct_manager_name')
  const departmentName = resolveUserValue(currentUser, 'departmentName', 'department_name', 'department')
  const position = resolveUserValue(currentUser, 'position', 'employeePosition', 'employee_position')
  const grade = resolveUserValue(currentUser, 'grade', 'employeeGrade', 'employee_grade')
  const roleCodes = Array.isArray(currentUser.roleCodes)
    ? currentUser.roleCodes.map((item) => normalizeText(item)).filter(Boolean)
    : []
  const draftClaimId = normalizeText(draftPayload?.claim_id || draftPayload?.claimId)
  const isSubmit = actionType === AI_APPLICATION_ACTION_SUBMIT

  return {
    source: 'user_message',
    user_id: username,
    conversation_id: normalizeText(conversationId) || null,
    message,
    context_json: {
      role_codes: roleCodes,
      is_admin: Boolean(currentUser.isAdmin),
      name,
      role: resolveUserValue(currentUser, 'role'),
      department: departmentName,
      department_name: departmentName,
      position,
      employee_position: position,
      employeePosition: position,
      grade,
      employee_grade: grade,
      employeeGrade: grade,
      employee_no: employeeNo,
      employeeNo,
      manager_name: managerName,
      managerName,
      direct_manager_name: managerName,
      directManagerName: managerName,
      cost_center: resolveUserValue(currentUser, 'costCenter', 'cost_center'),
      finance_owner_name: resolveUserValue(currentUser, 'financeOwnerName', 'finance_owner_name'),
      ...buildClientTimeContext(),
      session_type: 'application',
      entry_source: 'workbench_ai_inline',
      source: 'workbench',
      document_type: 'expense_application',
      application_stage: 'expense_application',
      user_input_text: message,
      application_preview: normalizedPreview,
      ...(isSubmit
        ? {}
        : {
            application_action: 'save_draft',
            application_save_mode: true
          }),
      ...(draftClaimId
        ? {
            application_edit_claim_id: draftClaimId,
            draft_claim_id: draftClaimId,
            selected_claim_id: draftClaimId,
            application_edit_mode: true
          }
        : {})
    }
  }
}

export function runAiApplicationPreviewAction(params = {}, options = {}) {
  const payload = buildAiApplicationPreviewActionPayload(params)
  const isSubmit = params.actionType === AI_APPLICATION_ACTION_SUBMIT
  return apiRequest('/reimbursements/application-preview-action', {
    method: 'POST',
    body: JSON.stringify(payload),
    timeoutMs: isSubmit ? 45000 : 30000,
    timeoutMessage: isSubmit ? '申请提交处理超时，请稍后重试。' : '申请草稿保存超时，请稍后重试。',
    ...options
  })
}