import { resolveInlineTravelApplicationRequest } from './workbenchAiApplicationGateModel.js'

export const WORKBENCH_AI_INTENT_SOURCE_MODEL = 'llm_function_call'
export const WORKBENCH_AI_INTENT_SOURCE_RULE_FALLBACK = 'rule_fallback'

export const WORKBENCH_AI_INTENT_CONFIDENCE_THRESHOLD = 0.6

export const WORKBENCH_AI_STEP_BUILD_APPLICATION_PREVIEW = 'build_application_preview'
export const WORKBENCH_AI_STEP_VALIDATE_REQUIRED_FIELDS = 'validate_required_fields'
export const WORKBENCH_AI_STEP_SAVE_APPLICATION_DRAFT = 'save_application_draft'
export const WORKBENCH_AI_STEP_RUN_DUPLICATE_PRECHECK = 'run_duplicate_precheck'
export const WORKBENCH_AI_STEP_SUBMIT_APPLICATION = 'submit_application'

const TRAVEL_APPLICATION_INTENT = 'create_travel_application'

function normalizePromptAction(prompt = '') {
  const compact = String(prompt || '').replace(/\s+/g, '')
  if (/直接提交|提交申请|确认提交|提交审批/.test(compact)) {
    return 'submit'
  }
  if (/保存草稿|保存|存草稿|先保存/.test(compact)) {
    return 'save_draft'
  }
  return 'preview'
}

function normalizePlannerSource(value = '') {
  return String(value || '').trim() === WORKBENCH_AI_INTENT_SOURCE_MODEL
    ? WORKBENCH_AI_INTENT_SOURCE_MODEL
    : WORKBENCH_AI_INTENT_SOURCE_RULE_FALLBACK
}

function normalizeSlotKey(key = '') {
  const normalized = String(key || '').trim()
  if (['time_range', 'business_time', 'occurred_date', 'application_time'].includes(normalized)) {
    return 'timeRange'
  }
  if (['transport_mode', 'transportType', 'transport_type', 'trafficMode'].includes(normalized)) {
    return 'transportMode'
  }
  if (['business_reason', 'businessPurpose', 'purpose'].includes(normalized)) {
    return 'reason'
  }
  return normalized
}

function normalizeSlots(rawSlots = {}) {
  if (!rawSlots || typeof rawSlots !== 'object') {
    return {}
  }
  return Object.entries(rawSlots).reduce((slots, [key, value]) => {
    const normalizedKey = normalizeSlotKey(key)
    const normalizedValue = String(value || '').trim()
    if (normalizedKey && normalizedValue) {
      slots[normalizedKey] = normalizedValue
    }
    return slots
  }, {})
}

const ONTOLOGY_FIELD_ALIASES = {
  business_time: 'time_range',
  occurred_date: 'time_range',
  application_time: 'time_range',
  transportType: 'transport_mode',
  transport_type: 'transport_mode',
  trafficMode: 'transport_mode',
  business_reason: 'reason',
  businessPurpose: 'reason',
  purpose: 'reason'
}

const SUPPORTED_ONTOLOGY_FIELDS = new Set([
  'expense_type',
  'time_range',
  'location',
  'reason',
  'amount',
  'transport_mode',
  'attachments',
  'customer_name',
  'merchant_name',
  'department_name',
  'employee_name',
  'employee_no'
])

function normalizeOntologyFields(rawFields = {}) {
  if (!rawFields || typeof rawFields !== 'object') {
    return {}
  }
  return Object.entries(rawFields).reduce((fields, [key, value]) => {
    const normalizedKey = ONTOLOGY_FIELD_ALIASES[String(key || '').trim()] || String(key || '').trim()
    const normalizedValue = String(value || '').trim()
    if (SUPPORTED_ONTOLOGY_FIELDS.has(normalizedKey) && normalizedValue) {
      fields[normalizedKey] = normalizedValue
    }
    return fields
  }, {})
}

function buildApplicationSteps(requestedAction = 'preview') {
  const steps = [
    WORKBENCH_AI_STEP_BUILD_APPLICATION_PREVIEW,
    WORKBENCH_AI_STEP_VALIDATE_REQUIRED_FIELDS
  ]
  if (requestedAction === 'submit') {
    steps.push(
      WORKBENCH_AI_STEP_RUN_DUPLICATE_PRECHECK,
      WORKBENCH_AI_STEP_SUBMIT_APPLICATION
    )
  } else if (requestedAction === 'save_draft') {
    steps.push(WORKBENCH_AI_STEP_SAVE_APPLICATION_DRAFT)
  }
  return steps
}

function normalizeServerApplicationSteps(rawSteps = []) {
  if (!Array.isArray(rawSteps)) {
    return []
  }
  const mappedSteps = rawSteps
    .map((step) => String(step?.action_type || step?.actionType || '').trim())
    .map((actionType) => {
      if (actionType === WORKBENCH_AI_STEP_BUILD_APPLICATION_PREVIEW) {
        return WORKBENCH_AI_STEP_BUILD_APPLICATION_PREVIEW
      }
      if (actionType === WORKBENCH_AI_STEP_VALIDATE_REQUIRED_FIELDS) {
        return WORKBENCH_AI_STEP_VALIDATE_REQUIRED_FIELDS
      }
      if (actionType === WORKBENCH_AI_STEP_SAVE_APPLICATION_DRAFT) {
        return WORKBENCH_AI_STEP_SAVE_APPLICATION_DRAFT
      }
      if (actionType === WORKBENCH_AI_STEP_RUN_DUPLICATE_PRECHECK) {
        return WORKBENCH_AI_STEP_RUN_DUPLICATE_PRECHECK
      }
      if (actionType === WORKBENCH_AI_STEP_SUBMIT_APPLICATION) {
        return WORKBENCH_AI_STEP_SUBMIT_APPLICATION
      }
      return ''
    })
    .filter(Boolean)
  return [...new Set(mappedSteps)]
}

function resolveModelTasks(rawPlan = {}) {
  return Array.isArray(rawPlan?.tasks) ? rawPlan.tasks : []
}

function isModelTravelApplicationTask(task = {}) {
  if (!task || typeof task !== 'object') {
    return false
  }
  const taskType = String(task?.task_type || task?.taskType || '').trim()
  const assignedAgent = String(task?.assigned_agent || task?.assignedAgent || '').trim()
  return taskType === 'expense_application' || assignedAgent === 'application_assistant'
}

function findModelTravelApplicationTask(rawPlan = {}) {
  return resolveModelTasks(rawPlan).find(isModelTravelApplicationTask) || null
}

function resolveModelRemainingTasks(rawPlan = {}, selectedTask = null) {
  const tasks = resolveModelTasks(rawPlan)
  const selectedIndex = tasks.findIndex((task) => task === selectedTask)
  if (selectedIndex < 0) {
    return []
  }
  return tasks.slice(selectedIndex + 1).filter((task) => {
    if (!task || typeof task !== 'object') {
      return false
    }
    const taskType = String(task?.task_type || task?.taskType || '').trim()
    const assignedAgent = String(task?.assigned_agent || task?.assignedAgent || '').trim()
    return Boolean(taskType || assignedAgent)
  })
}

function resolveCandidateFlows(rawPlan = {}) {
  const pendingFlow = rawPlan?.pending_flow_confirmation || rawPlan?.pendingFlowConfirmation || {}
  const pendingCandidates = pendingFlow?.candidate_flows || pendingFlow?.candidateFlows
  const rootCandidates = rawPlan?.candidate_flows || rawPlan?.candidateFlows
  if (Array.isArray(pendingCandidates)) {
    return pendingCandidates
  }
  return Array.isArray(rootCandidates) ? rootCandidates : []
}

function findSingleApplicationCandidateFlow(rawPlan = {}) {
  const pendingFlow = rawPlan?.pending_flow_confirmation || rawPlan?.pendingFlowConfirmation || {}
  if (String(pendingFlow?.status || '').trim() !== 'pending') {
    return null
  }
  const candidateFlows = resolveCandidateFlows(rawPlan)
  if (candidateFlows.length !== 1) {
    return null
  }
  const [candidate] = candidateFlows
  const flowId = String(candidate?.flow_id || candidate?.flowId || '').trim()
  const label = String(candidate?.label || '').trim()
  if (flowId === 'travel_application' && /先发起出差申请/.test(label)) {
    return candidate
  }
  return null
}

export function normalizeWorkbenchAiIntentPlan(rawPlan = {}, options = {}) {
  const prompt = String(options.prompt || rawPlan?.sourceText || rawPlan?.source_text || '').trim()
  const task = findModelTravelApplicationTask(rawPlan)
  if (!task) {
    const candidateFlow = findSingleApplicationCandidateFlow(rawPlan)
    if (!candidateFlow) {
      return null
    }
    const ontologyFields = normalizeOntologyFields(candidateFlow.ontology_fields || candidateFlow.ontologyFields)
    const requestedAction = normalizePromptAction(prompt)
    return {
      source: normalizePlannerSource(rawPlan.planning_source || rawPlan.planningSource),
      intent: TRAVEL_APPLICATION_INTENT,
      requestedAction,
      confidence: Number(candidateFlow.confidence || rawPlan.confidence || 0),
      sourceText: prompt,
      ontologyFields,
      slots: normalizeSlots(ontologyFields),
      missingFields: Array.isArray(candidateFlow.missing_fields || candidateFlow.missingFields)
        ? candidateFlow.missing_fields || candidateFlow.missingFields
        : [],
      steps: buildApplicationSteps(requestedAction)
    }
  }

  const rawOntologyFields = task.ontology_fields || task.ontologyFields || rawPlan.slots
  const ontologyFields = normalizeOntologyFields(rawOntologyFields)
  const requestedAction = String(
    task.requested_action ||
      task.requestedAction ||
      rawPlan.requested_action ||
      rawPlan.requestedAction ||
      ''
  ).trim() || normalizePromptAction(prompt)
  const serverSteps = normalizeServerApplicationSteps(task.action_steps || task.actionSteps)
  return {
    source: normalizePlannerSource(rawPlan.planning_source || rawPlan.planningSource),
    intent: TRAVEL_APPLICATION_INTENT,
    requestedAction,
    confidence: Number(task.confidence || rawPlan.confidence || 0),
    sourceText: prompt,
    ontologyFields,
    slots: normalizeSlots(ontologyFields),
    missingFields: Array.isArray(task.missing_fields || task.missingFields)
      ? task.missing_fields || task.missingFields
      : [],
    steps: serverSteps.length ? serverSteps : buildApplicationSteps(requestedAction),
    stewardRemainingTasks: resolveModelRemainingTasks(rawPlan, task)
  }
}

export function buildRuleFallbackWorkbenchAiIntentPlan(prompt = '') {
  const request = resolveInlineTravelApplicationRequest(prompt)
  if (!request) {
    return null
  }
  const requestedAction = request.requestedSubmit ? 'submit' : normalizePromptAction(prompt)
  return {
    source: WORKBENCH_AI_INTENT_SOURCE_RULE_FALLBACK,
    intent: TRAVEL_APPLICATION_INTENT,
    requestedAction,
    confidence: 0.72,
    sourceText: request.sourceText,
    ontologyFields: {},
    slots: {},
    missingFields: [],
    steps: buildApplicationSteps(requestedAction)
  }
}

export function shouldRequestWorkbenchAiIntentPlan(prompt = '') {
  const compact = String(prompt || '').replace(/\s+/g, '')
  if (!compact) {
    return false
  }
  if (compact.length < 2 || /^[\d\s.,，。:：;；!?！？-]+$/.test(compact)) {
    return false
  }
  if (!WORKBENCH_AI_BUSINESS_KEYWORD_PATTERN.test(compact)) {
    return false
  }
  return true
}

const WORKBENCH_AI_BUSINESS_KEYWORD_PATTERN = (
  /报销|报账|出差|差旅|申请|审批|审核|报销单|申请单|草稿|删除|提交|保存|查|看|找|列出|发起|新建|创建|驳回|退回|通过|多少|标准|制度|规则|政策/
)

export function resolveExecutableTravelApplicationPlan(plan = null) {
  if (!plan || plan.intent !== TRAVEL_APPLICATION_INTENT) {
    return null
  }
  if (!Array.isArray(plan.steps) || !plan.steps.includes(WORKBENCH_AI_STEP_BUILD_APPLICATION_PREVIEW)) {
    return null
  }
  const requestedSubmit = plan.steps.includes(WORKBENCH_AI_STEP_SUBMIT_APPLICATION)
  const request = {
    expenseType: 'travel',
    expenseTypeLabel: '差旅费',
    sourceText: String(plan.sourceText || '').trim(),
    ontologyFields: normalizeOntologyFields(plan.ontologyFields || {}),
    autoSubmit: false,
    autoSaveDraft: plan.steps.includes(WORKBENCH_AI_STEP_SAVE_APPLICATION_DRAFT),
    requestedSubmit,
    submitRequiresConfirmation: requestedSubmit
  }
  const stewardRemainingTasks = Array.isArray(plan.stewardRemainingTasks) ? plan.stewardRemainingTasks : []
  if (stewardRemainingTasks.length) {
    request.stewardRemainingTasks = stewardRemainingTasks
  }
  return request
}

export function isLowConfidenceTravelApplicationPlan(plan = null) {
  if (!plan || plan.intent !== TRAVEL_APPLICATION_INTENT) {
    return false
  }
  if (plan.source === WORKBENCH_AI_INTENT_SOURCE_RULE_FALLBACK) {
    return false
  }
  if (plan.requestedAction === 'submit' || plan.requestedAction === 'save_draft') {
    return false
  }
  const confidence = Number(plan.confidence)
  if (!Number.isFinite(confidence)) {
    return false
  }
  return confidence < WORKBENCH_AI_INTENT_CONFIDENCE_THRESHOLD
}