import type { PaginationRequest } from '@/types/product-master-data/api'
import type { Product } from '@/types/product-master-data/product'

// ===== Mock 数据（至少7条） =====
const mockProducts: Product[] = [
  { productId: 1, productCode: 'PROD-001', productName: '5052铝板', category: '铝加工材', stage: '量产', grade: '一级品', standardized: '标品', minOrderQty: 5000.0000, isActive: 1, creationDate: '2026-01-15 08:30:00', createdBy: '张三', lastUpdateDate: '2026-06-20 14:00:00', lastUpdatedBy: '李四', versionNum: 1 },
  { productId: 2, productCode: 'PROD-002', productName: '6061铝棒', category: '铝加工材', stage: '量产', grade: '一级品', standardized: '标品', minOrderQty: 3000.0000, isActive: 1, creationDate: '2026-02-10 09:00:00', createdBy: '王五', lastUpdateDate: '2026-06-19 10:30:00', lastUpdatedBy: '王五', versionNum: 2 },
  { productId: 3, productCode: 'PROD-003', productName: '铝合金窗框', category: '铝加工制品', stage: '试产', grade: '二级品', standardized: '非标品', minOrderQty: 1000.0000, isActive: 1, creationDate: '2026-03-20 13:15:00', createdBy: '赵六', lastUpdateDate: '2026-06-18 16:45:00', lastUpdatedBy: '赵六', versionNum: 1 },
  { productId: 4, productCode: 'PROD-004', productName: '7075铝型材', category: '铝加工材', stage: '样品', grade: '一级品', standardized: '非标品', minOrderQty: 500.0000, isActive: 0, creationDate: '2026-04-05 10:00:00', createdBy: '张三', lastUpdateDate: '2026-05-15 11:20:00', lastUpdatedBy: '李四', versionNum: 3 },
  { productId: 5, productCode: 'PROD-005', productName: '废铝料A型', category: '废铝', stage: '量产', grade: '二级品', standardized: '标品', minOrderQty: 10000.0000, isActive: 1, creationDate: '2026-01-28 08:00:00', createdBy: '孙七', lastUpdateDate: '2026-06-21 09:30:00', lastUpdatedBy: '孙七', versionNum: 1 },
  { productId: 6, productCode: 'PROD-006', productName: '铝门框架-X1', category: '铝加工制品', stage: '量产', grade: '一级品', standardized: '标品', minOrderQty: 2000.0000, isActive: 1, creationDate: '2026-02-18 14:30:00', createdBy: '周八', lastUpdateDate: '2026-06-22 08:00:00', lastUpdatedBy: '周八', versionNum: 2 },
  { productId: 7, productCode: 'PROD-007', productName: '铝板边角料', category: '废铝', stage: '样品', grade: '二级品', standardized: '非标品', minOrderQty: 8000.0000, isActive: 0, creationDate: '2026-03-10 11:00:00', createdBy: '吴九', lastUpdateDate: '2026-04-20 15:00:00', lastUpdatedBy: '吴九', versionNum: 1 },
]

let nextId = 8

// 模拟 200ms 网络延迟
function delay(ms = 200): Promise<void> {
  return new Promise(resolve => setTimeout(resolve, ms))
}

// 深拷贝
function clone<T>(obj: T): T {
  return JSON.parse(JSON.stringify(obj))
}

// ===== API 函数 =====

// GET /crmProduct/get-id?id=xxx
export function getById(id: number) {
  // Mock 实现
  const product = mockProducts.find(p => p.productId === id)
  return delay().then(() => {
    if (!product) {
      return { code: '3100_crm_product_005', msg: '产品数据不存在', data: null }
    }
    return { code: '200', msg: '成功', data: clone(product) }
  })
}

// POST /crmProduct/find-pagination
export function findPagination(data: PaginationRequest) {
  const { pageIndex = 1, pageRows = 20, params = {} } = data
  return delay().then(() => {
    let filtered = [...mockProducts]
    const p = params as Record<string, unknown>
    if (p.productCode) {
      const keyword = String(p.productCode).toLowerCase()
      filtered = filtered.filter(item => item.productCode.toLowerCase().includes(keyword))
    }
    if (p.productName) {
      const keyword = String(p.productName).toLowerCase()
      filtered = filtered.filter(item => item.productName.toLowerCase().includes(keyword))
    }
    if (p.category) {
      filtered = filtered.filter(item => item.category === p.category)
    }
    if (p.stage) {
      filtered = filtered.filter(item => item.stage === p.stage)
    }
    if (p.standardized) {
      filtered = filtered.filter(item => item.standardized === p.standardized)
    }
    if (p.isActive !== '' && p.isActive !== undefined && p.isActive !== null) {
      filtered = filtered.filter(item => item.isActive === Number(p.isActive))
    }
    // 按 creationDate 降序排序
    filtered.sort((a, b) => {
      const dateA = a.creationDate || ''
      const dateB = b.creationDate || ''
      return dateB.localeCompare(dateA)
    })
    const total = filtered.length
    const start = (pageIndex - 1) * pageRows
    const records = filtered.slice(start, start + pageRows)
    return {
      code: '200',
      msg: '成功',
      data: { total, records, pageIndex, pageRows },
    }
  })
}

// POST /crmProduct/save
// 注意: 项目使用 { params: formData } 包装保存请求
export function save(params: Product) {
  return delay().then(() => {
    // 编码唯一性校验
    if (mockProducts.some(p => p.productCode === params.productCode)) {
      return { code: '3100_crm_product_007', msg: '产品编码已存在', data: null }
    }
    const newProduct: Product = {
      ...params,
      productId: nextId++,
      isActive: params.isActive ? 1 : 0,  // 注意: 后端 isActive 是 number
      creationDate: new Date().toISOString().replace('T', ' ').substring(0, 19),
      createdBy: '当前用户',
      lastUpdateDate: new Date().toISOString().replace('T', ' ').substring(0, 19),
      lastUpdatedBy: '当前用户',
      versionNum: 1,
    }
    mockProducts.unshift(newProduct)
    return { code: '200', msg: '成功', data: clone(newProduct) }
  })
}

// POST /crmProduct/update
export function update(params: Product) {
  return delay().then(() => {
    const index = mockProducts.findIndex(p => p.productId === params.productId)
    if (index === -1) {
      return { code: '3100_crm_product_005', msg: '产品数据不存在', data: null }
    }
    // 乐观锁检查
    if (params.versionNum !== undefined && mockProducts[index].versionNum !== params.versionNum) {
      return { code: 'UPDATE_DATA_VERSION_ERROR', msg: '数据已被他人修改，请刷新后重试', data: null }
    }
    const updated = {
      ...mockProducts[index],
      ...params,
      productCode: mockProducts[index].productCode, // 编码不可修改
      isActive: params.isActive ? 1 : 0,
      lastUpdateDate: new Date().toISOString().replace('T', ' ').substring(0, 19),
      lastUpdatedBy: '当前用户',
      versionNum: (mockProducts[index].versionNum || 0) + 1,
    }
    mockProducts[index] = updated
    return { code: '200', msg: '成功', data: clone(updated) }
  })
}

// GET /crmProduct/delete?id=xxx
export function deleteProduct(id: number) {
  return delay().then(() => {
    const index = mockProducts.findIndex(p => p.productId === id)
    if (index === -1) {
      return { code: '3100_crm_product_005', msg: '产品数据不存在', data: null }
    }
    mockProducts[index].isActive = 0
    mockProducts[index].lastUpdateDate = new Date().toISOString().replace('T', ' ').substring(0, 19)
    mockProducts[index].lastUpdatedBy = '当前用户'
    return { code: '200', msg: '成功', data: null }
  })
}

// GET /crmProduct/get-by-code?productCode=xxx
export function getByCode(productCode: string) {
  return delay().then(() => {
    const product = mockProducts.find(p => p.productCode === productCode)
    if (!product) {
      return { code: '200', msg: '成功', data: null }  // 不存在返回 null data
    }
    if (product.isActive === 0) {
      return { code: '3100_crm_product_009', msg: '该产品已下架，不可使用', data: null }
    }
    return { code: '200', msg: '成功', data: clone(product) }
  })
}