/**
 * 审批流服务 - 与后端审批API交互
 */

import { authFetch, baseUrl } from './authHelper'
import type { AdminRole } from '../auth/roles'

export interface ApprovalFlow {
  id: number
  flowCode: string
  flowName: string
  moduleCode: string
  description?: string
  status: number
  createdAt: string
  updatedAt?: string
}

export interface ApprovalRecord {
  id: number
  flowId: number
  bizType: string
  bizId: string
  title: string
  applicantId: number
  applicantName: string
  currentStatus: string
  currentNodeId: number
  currentNodeName: string
  applyReason?: string
  applyAttachments?: string
  createdAt: string
  updatedAt?: string
}

export interface ApprovalNode {
  id: number
  flowId: number
  nodeName: string
  nodeType: 'start' | 'approver' | 'condition' | 'cc' | 'end'
  approverType: 'user' | 'role' | 'department_leader'
  approverIds?: string
  approverRoles?: string
  condition?: string
  timeout: number
  action: string
  sortOrder: number
}

export interface ApprovalHistory {
  id: number
  recordId: number
  nodeId: number
  nodeName: string
  action: 'submit' | 'approve' | 'reject' | 'transfer' | 'callback'
  operatorId: number
  operatorName: string
  comment?: string
  attachments?: string
  createdAt: string
}

export interface CreateFlowRequest {
  flowCode: string
  flowName: string
  moduleCode: string
  description?: string
}

export interface UpdateFlowRequest extends Partial<CreateFlowRequest> {
  id: number
  status?: number
}

export interface ApiResponse<T> {
  code: number
  data: T
  message?: string
}

/**
 * 审批流服务类
 */
class ApprovalService {
  private baseUrl = baseUrl || '/api/v1'

  /**
   * 获取所有审批流
   */
  async getFlows(): Promise<ApprovalFlow[]> {
    const response = await authFetch(`${this.baseUrl}/approval/flows`, {
      credentials: undefined
    })
    const result = await response.json() as ApiResponse<ApprovalFlow[]>
    if (result.code !== 200) {
      throw new Error(result.message || '获取审批流失败')
    }
    return result.data
  }

  /**
   * 获取审批流详情
   */
  async getFlowById(id: number): Promise<ApprovalFlow | null> {
    const response = await authFetch(`${this.baseUrl}/approval/flows/${id}`, {
      credentials: undefined
    })
    const result = await response.json() as ApiResponse<ApprovalFlow>
    if (result.code !== 200) {
      return null
    }
    return result.data
  }

  /**
   * 创建审批流
   */
  async createFlow(data: CreateFlowRequest): Promise<number> {
    const response = await authFetch(`${this.baseUrl}/approval/flows`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify(data)
    })
    const result = await response.json() as ApiResponse<number>
    if (result.code !== 200) {
      throw new Error(result.message || '创建审批流失败')
    }
    return result.data
  }

  /**
   * 更新审批流
   */
  async updateFlow(data: UpdateFlowRequest): Promise<void> {
    const response = await authFetch(`${this.baseUrl}/approval/flows/${data.id}`, {
      method: 'PUT',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify(data)
    })
    const result = await response.json() as ApiResponse<void>
    if (result.code !== 200) {
      throw new Error(result.message || '更新审批流失败')
    }
  }

  /**
   * 删除审批流
   */
  async deleteFlow(id: number): Promise<void> {
    const response = await authFetch(`${this.baseUrl}/approval/flows/${id}`, {
      method: 'DELETE',
      credentials: undefined
    })
    const result = await response.json() as ApiResponse<void>
    if (result.code !== 200) {
      throw new Error(result.message || '删除审批流失败')
    }
  }

  /**
   * 获取待审批列表
   */
  async getPendingApprovals(): Promise<ApprovalRecord[]> {
    const response = await authFetch(`${this.baseUrl}/approval/pending`, {
      credentials: undefined
    })
    const result = await response.json() as ApiResponse<ApprovalRecord[]>
    if (result.code !== 200) {
      throw new Error(result.message || '获取待审批列表失败')
    }
    return result.data
  }

  /**
   * 获取已审批列表
   */
  async getApprovedList(): Promise<ApprovalRecord[]> {
    const response = await authFetch(`${this.baseUrl}/approval/processed`, {
      credentials: undefined
    })
    const result = await response.json() as ApiResponse<ApprovalRecord[]>
    if (result.code !== 200) {
      throw new Error(result.message || '获取已审批列表失败')
    }
    return result.data
  }

  /**
   * 获取我发起的审批
   */
  async getMyApplications(): Promise<ApprovalRecord[]> {
    const response = await authFetch(`${this.baseUrl}/approval/my`, {
      credentials: undefined
    })
    const result = await response.json() as ApiResponse<ApprovalRecord[]>
    if (result.code !== 200) {
      throw new Error(result.message || '获取我发起的审批失败')
    }
    return result.data
  }

  /**
   * 审批操作（统一入口）
   * @deprecated 请使用 approveRecord, rejectRecord, transferRecord 三个独立方法
   */
  async approve(data: {
    recordId: number
    action: 'APPROVE' | 'REJECT' | 'TRANSFER'
    operatorId: number
    comment?: string
    transferTo?: number  // TRANSFER时必填
  }): Promise<void> {
    // 根据action调用对应的独立接口
    switch (data.action) {
      case 'APPROVE':
        return this.approveRecord({ recordId: data.recordId, comment: data.comment })
      case 'REJECT':
        return this.rejectRecord({ recordId: data.recordId, comment: data.comment })
      case 'TRANSFER':
        if (data.transferTo == null) {
          throw new Error('TRANSFER操作需要提供transferTo参数')
        }
        return this.transferRecord({ recordId: data.recordId, transferTo: data.transferTo, comment: data.comment })
      default:
        throw new Error(`Unknown action: ${data.action}`)
    }
  }

  /**
   * 审批通过
   */
  async approveRecord(data: {
    recordId: number
    comment?: string
  }): Promise<void> {
    const response = await authFetch(`${this.baseUrl}/approval/approve`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify({
        recordId: data.recordId,
        comment: data.comment || ''
      })
    })
    const result = await response.json() as ApiResponse<void>
    if (result.code !== 200) {
      throw new Error(result.message || '审批通过失败')
    }
  }

  /**
   * 审批拒绝
   */
  async rejectRecord(data: {
    recordId: number
    comment?: string
  }): Promise<void> {
    const response = await authFetch(`${this.baseUrl}/approval/reject`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify({
        recordId: data.recordId,
        comment: data.comment || ''
      })
    })
    const result = await response.json() as ApiResponse<void>
    if (result.code !== 200) {
      throw new Error(result.message || '审批拒绝失败')
    }
  }

  /**
   * 审批转交
   */
  async transferRecord(data: {
    recordId: number
    transferTo: number
    comment?: string
  }): Promise<void> {
    const response = await authFetch(`${this.baseUrl}/approval/transfer`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify({
        recordId: data.recordId,
        transferTo: data.transferTo,
        comment: data.comment || ''
      })
    })
    const result = await response.json() as ApiResponse<void>
    if (result.code !== 200) {
      throw new Error(result.message || '审批转交失败')
    }
  }

  /**
   * 审批委托
   */
  async delegateRecord(data: {
    recordId: number
    delegateTo: number
    reason?: string
  }): Promise<void> {
    const response = await authFetch(`${this.baseUrl}/approval/delegate`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify({
        recordId: data.recordId,
        delegateTo: data.delegateTo,
        reason: data.reason || ''
      })
    })
    const result = await response.json() as ApiResponse<void>
    if (result.code !== 200) {
      throw new Error(result.message || '审批委托失败')
    }
  }

  /**
   * 批量审批操作
   * 使用新批量接口 POST /api/v1/approval/batch (approval.index.batch.ALL)
   * 注意：批量转交使用 POST /api/v1/approval/batch-transfer (approval.index.batch.transfer.ALL)
   */
  async batchApprove(data: {
    recordIds: number[]
    action: 'APPROVE' | 'REJECT' | 'TRANSFER'
    comment?: string
  }): Promise<{
    total: number
    successCount: number
    failCount: number
    results: Array<{ recordId: number; success: boolean; status: string; message: string }>
  }> {
    // 根据操作类型选择接口：TRANSFER使用批量转交接口，其他使用批量审批接口
    const endpoint = data.action === 'TRANSFER'
      ? `${this.baseUrl}/api/v1/approval/batch-transfer`
      : `${this.baseUrl}/api/v1/approval/batch`;

    const response = await authFetch(endpoint, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify(data)
    })
    const result = await response.json() as ApiResponse<{
      total: number
      successCount: number
      failCount: number
      results: Array<{ recordId: number; success: boolean; status: string; message: string }>
    }>
    if (result.code !== 200) {
      throw new Error(result.message || '批量审批操作失败')
    }
    return result.data
  }

  /**
   * 提交审批申请
   */
  async submitApproval(data: {
    flowId: number
    bizType: string
    bizId: number
    title: string
    applicantId: number
    applyReason: string
  }): Promise<number> {
    const response = await authFetch(`${this.baseUrl}/approval/submit`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify(data)
    })
    const result = await response.json() as ApiResponse<{ recordId: number }>
    if (result.code !== 200) {
      throw new Error(result.message || '提交审批失败')
    }
    return result.data.recordId
  }

  /**
   * 取消审批
   */
  async cancelApproval(recordId: number, operatorId: number): Promise<void> {
    const response = await authFetch(`${this.baseUrl}/approval/cancel`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify({ recordId, operatorId })
    })
    const result = await response.json() as ApiResponse<void>
    if (result.code !== 200) {
      throw new Error(result.message || '取消审批失败')
    }
  }

  /**
   * 获取审批记录详情
   */
  async getRecordById(id: number): Promise<ApprovalRecord | null> {
    const response = await authFetch(`${this.baseUrl}/approval/records/${id}`, {
      credentials: undefined
    })
    const result = await response.json() as ApiResponse<ApprovalRecord>
    if (result.code !== 200) {
      return null
    }
    return result.data
  }

  /**
   * 获取审批历史
   */
  async getApprovalHistory(recordId: number): Promise<ApprovalHistory[]> {
    const response = await authFetch(`${this.baseUrl}/approval/records/${recordId}/history`, {
      credentials: undefined
    })
    const result = await response.json() as ApiResponse<ApprovalHistory[]>
    if (result.code !== 200) {
      throw new Error(result.message || '获取审批历史失败')
    }
    return result.data
  }

  /**
   * 添加审批意见（不改变审批状态）
   */
  async addComment(recordId: number, comment: string): Promise<void> {
    const response = await authFetch(`${this.baseUrl}/approval/records/${recordId}/comment`, {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      credentials: undefined,
      body: JSON.stringify({ comment })
    })
    const result = await response.json() as ApiResponse<void>
    if (result.code !== 200) {
      throw new Error(result.message || '添加审批意见失败')
    }
  }
}

export const approvalService = new ApprovalService()
export default approvalService