const BigNumber = require('bignumber.js');

exports.getPackageData = function (data, rest = {}) {
  return {
    ...rest,
    name: data.name.trim(),
    cateId: typeof data.cateId === 'string' ? data.cateId : '',
    desc: typeof data.desc === 'string' ? data.desc.trim() : '',
    hasValidDays: typeof data.hasValidDays === 'boolean' ? data.hasValidDays : false,
    validDays: typeof data.validDays === 'number' ? data.validDays : 0,
    enableDiscount: typeof data.enableDiscount === 'boolean' ? data.enableDiscount : false,
    minDiscount: typeof data.minDiscount === 'number' ? data.minDiscount : 10,
    packageType: data.packageType,
    packagePrice: data.packagePrice,
    projectNumber: data.projectNumber,
    projects: data.projects.map(i => ({
      _id: i._id,
      projectName: i.projectName,
      projectCateId: i.projectCateId,
      price: i.price,
      number: i.number,
      discount: i.discount,
      required: i.required
    }))
  }
}

exports.verifyPakcage = function (data) {
  if (typeof data.name !== 'string' || data.name.trim() === '') {
    return '套餐名称不能为空'
  }
  if (data.name.trim().length > 50) {
    return '套餐名称不能超过50个字符'
  }
  if (data.desc && typeof data.desc !== 'string') {
    return '套餐描述必须是字符串'
  }
  if (typeof data.desc === 'string' && data.desc.trim().length > 500) {
    return '套餐描述不能超过500个字符'
  }
  if (typeof data.hasValidDays !== 'boolean') {
    return '是否有有效期设置不正确'
  }
  if (data.hasValidDays && (typeof data.validDays !== 'number' || !(data.validDays > 0)) || data.validDays % 1 !== 0) {
    return '有效天数无效'
  }
  if (typeof data.enableDiscount !== 'boolean') {
    return '启用折扣设置不正确'
  }
  if (data.enableDiscount && (typeof data.minDiscount !== 'number' || !(data.minDiscount > 0 && data.minDiscount <= 10))) {
    return '最小折扣无效'
  }
  if (typeof data.cateId !== 'string' || data.cateId.trim() === '') {
    return '套餐分类不能为空'
  }
  if (data.enableDiscount && !checkDecimal(data.minDiscount, 2)) {
    return '最小折扣最多支持2为小数'
  }
  if (!['fixed', 'free'].includes(data.packageType)) {
    return '套餐类型不正确'
  }
  if (data.packagePrice === 'free' && (typeof data.packagePrice !== 'number' || !(data.packagePrice > 0))) {
    return '套餐价格无效'
  }
  if (data.packagePrice === 'free' && !checkDecimal(data.packagePrice, 2)) {
    return '套餐价格最多支持2位小数'
  }
  const msg = verifyPackageItems(data.projects, data.packageType);
  if (msg) return msg;
  if (typeof data.projectNumber !== 'number' || !(data.projectNumber > 0) || !checkDecimal(data.projectNumber, 0)) {
    return '套餐项目数量设置不正确'
  }
}

function verifyPackageItems(projects, packageType) {
  if (!Array.isArray(projects) || projects.length === 0) {
    return '套餐项目不能为空'
  }
  if (packageType === 'fixed' && projects.some(i => !(i._id && typeof i.projectName === 'string' && i.projectName.trim() !== '' && i.price && i.number && i.discount))) return '套餐项目信息不完整'
  for (let project of projects) {
    const name = project.projectName.trim();
    if (typeof project._id !== 'string' || project._id.trim() === '') {
      return `${name}数据设置不正确`
    }
    if (typeof project.price !== 'number' || !(project.price > 0)) {
      return `${name}价格设置不正确`
    }
    // if (checkDecimal(project.price, 2)) {
    //   return `${name}价格最多支持2位小数`
    // }
    if (typeof project.number !== 'number' || !(project.number > 0) || !checkDecimal(project.number, 0)) {
      return `${name} 项目数量设置不正确`
    }
    if (packageType === 'fixed') {
      if (typeof project.discount !== 'number' || !(project.discount > 0 && project.discount <= 10 && checkDecimal(project.discount, 2))) {
        return `${name} 折扣设置不正确`
      }
    }
    if (typeof project.required !== 'boolean') {
      return `${name} 是否必选设置不正确`
    }
  }
}

/**
 * 计算项目套餐价格
 */
exports.getPackageListWithPrice = function (packageList) {
  if (!Array.isArray(packageList)) return [];
  return packageList.map(p => {
    const projectData = Array.isArray(p.packageProjects) ? p.packageProjects : [];
    const _projects = Array.isArray(p.projects) ? p.projects : [];
    let allProjectPrice = new BigNumber(0);
    let count = 0;
    const projects = _projects.map(i => {
      const project = projectData.find(j => j._id === i._id);
      let projectFee = 0
      if (p.packageType === 'fixed') {
        count += 1
        const price = project && project.price >= 0 ? Number(project.price) : 0;
        const discount = i.discount >= 0 ? Number(i.discount) : 10;
        const number = i.number >= 0 ? Number(i.number) : 1;
        projectFee = new BigNumber(price).multipliedBy(discount).dividedBy(10).multipliedBy(number).toNumber();
        allProjectPrice = allProjectPrice.plus(projectFee);
      }
      return {
        ...i,
        projectName: project ? project.projectName : i.projectName,
        price: project ? project.price : i.price,
        number: i.number,
        discount: i.discount,
        projectFee,
        lowestDiscount: project ? project.lowestDiscount : '',
      }
    })
    const { packageProjects, ...rest } = p;
    return {
      ...rest,
      projects,
      count,
      packagePrice: p.packageType === 'fixed' ? allProjectPrice.toNumber() : p.packagePrice,
    }
  })
}


function checkDecimal(num, len) {
  if (typeof num !== 'number' || typeof len !== 'number' || !(len >= 0) || len % 1 !== 0) return false;
  if (len === 0) return Number.isInteger(num);
  return parseFloat(num.toFixed(len)) === num
}