247 lines
8.1 KiB
C#
247 lines
8.1 KiB
C#
using YD_Event.Core.Enum;
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namespace YD_Event.Core.Domain.Pricing;
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/// <summary>
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/// 赛事定价计算服务
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/// 所有金额计算均以此服务为准，确保计算结果的一致性
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/// </summary>
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public static class EventPricingService
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{
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/// <summary>
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/// 定价计算输入参数
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/// </summary>
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public class PricingInput
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{
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/// <summary>
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/// 收费模式
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/// </summary>
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public ChargeMode ChargeMode { get; set; }
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/// <summary>
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/// 参赛人数
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/// </summary>
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public int ParticipantCount { get; set; }
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/// <summary>
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/// 赛事定价（用于定价（赛事）和单价（赛事）模式）
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/// </summary>
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public decimal EventPrice { get; set; }
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/// <summary>
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/// 项目列表（单价项目模式使用）
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/// </summary>
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public List<ProjectPricingInfo> Projects { get; set; } = new List<ProjectPricingInfo>();
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}
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/// <summary>
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/// 项目定价信息
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/// </summary>
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public class ProjectPricingInfo
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{
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/// <summary>
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/// 项目ID
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/// </summary>
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public long ProjectId { get; set; }
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/// <summary>
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/// 项目名称
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/// </summary>
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public string ProjectName { get; set; } = string.Empty;
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/// <summary>
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/// 项目单价（元）
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/// </summary>
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public decimal UnitPrice { get; set; }
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}
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/// <summary>
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/// 定价计算结果
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/// </summary>
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public class PricingResult
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{
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/// <summary>
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/// 总金额（精确到分）
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/// </summary>
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public decimal TotalAmount { get; set; }
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/// <summary>
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/// 总人数
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/// </summary>
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public int TotalPersonCount { get; set; }
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/// <summary>
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/// 费用明细
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/// </summary>
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public List<PricingDetailItem> Details { get; set; } = new List<PricingDetailItem>();
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/// <summary>
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/// 计算日志（用于审计）
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/// </summary>
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public List<string> CalculationLogs { get; set; } = new List<string>();
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}
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/// <summary>
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/// 费用明细项
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/// </summary>
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public class PricingDetailItem
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{
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/// <summary>
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/// 项目名称
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/// </summary>
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public string ItemName { get; set; } = string.Empty;
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/// <summary>
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/// 单价
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/// </summary>
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public decimal UnitPrice { get; set; }
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/// <summary>
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/// 数量
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/// </summary>
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public int Quantity { get; set; }
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/// <summary>
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/// 小计
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/// </summary>
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public decimal Subtotal { get; set; }
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/// <summary>
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/// 备注
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/// </summary>
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public string? Remark { get; set; }
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}
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/// <summary>
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/// 计算赛事报名费用
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/// </summary>
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/// <param name="input">定价计算输入</param>
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/// <returns>定价计算结果</returns>
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public static PricingResult Calculate(PricingInput input)
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{
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var result = new PricingResult
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{
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TotalPersonCount = input.ParticipantCount
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};
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result.CalculationLogs.Add($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] 开始计算费用，收费模式: {input.ChargeMode}, 人数: {input.ParticipantCount}");
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switch (input.ChargeMode)
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{
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case ChargeMode.Free:
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CalculateFreeMode(result);
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break;
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case ChargeMode.FixedPrice:
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CalculateFixedPriceMode(result, input);
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break;
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case ChargeMode.UnitPriceEvent:
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CalculateUnitPriceEventMode(result, input);
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break;
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case ChargeMode.UnitPriceProject:
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CalculateUnitPriceProjectMode(result, input);
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break;
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}
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// 确保金额精确到分
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result.TotalAmount = Math.Round(result.TotalAmount, 2, MidpointRounding.AwayFromZero);
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result.CalculationLogs.Add($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] 最终总金额: {result.TotalAmount:F2} 元");
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return result;
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}
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/// <summary>
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/// 免费模式
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/// </summary>
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private static void CalculateFreeMode(PricingResult result)
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{
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result.TotalAmount = 0;
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result.Details.Add(new PricingDetailItem
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{
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ItemName = "报名费",
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UnitPrice = 0,
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Quantity = 1,
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Subtotal = 0,
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Remark = "免费"
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});
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result.CalculationLogs.Add($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] 免费模式，总金额: 0 元");
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}
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/// <summary>
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/// 定价（赛事）模式：固定为赛事设定价格/场，无论参赛主体是个人还是单位，也无论参赛项目数量多少，均统一按固定价格计算
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/// </summary>
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private static void CalculateFixedPriceMode(PricingResult result, PricingInput input)
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{
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var price = input.EventPrice;
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result.TotalAmount = price;
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result.Details.Add(new PricingDetailItem
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{
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ItemName = "赛事报名费",
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UnitPrice = price,
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Quantity = 1,
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Subtotal = price,
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Remark = $"固定价格 {price:F2} 元/场，参赛人数: {input.ParticipantCount} 人"
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});
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result.CalculationLogs.Add($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] 定价（赛事）模式: 固定价格 {price:F2} 元/场");
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}
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/// <summary>
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/// 单价（赛事）模式：按照赛事设定的单价乘以实际报名人数计算总金额
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/// </summary>
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private static void CalculateUnitPriceEventMode(PricingResult result, PricingInput input)
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{
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var unitPrice = input.EventPrice;
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var totalAmount = unitPrice * input.ParticipantCount;
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result.TotalAmount = totalAmount;
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result.Details.Add(new PricingDetailItem
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{
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ItemName = "赛事报名费",
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UnitPrice = unitPrice,
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Quantity = input.ParticipantCount,
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Subtotal = totalAmount,
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Remark = input.ParticipantCount == 1
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? $"个人参赛 {unitPrice:F2} 元"
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: $"团队参赛 {unitPrice:F2} 元/人 × {input.ParticipantCount} 人"
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});
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result.CalculationLogs.Add($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] 单价（赛事）模式: {unitPrice:F2} 元/人 × {input.ParticipantCount} 人 = {totalAmount:F2} 元");
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}
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/// <summary>
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/// 单价（项目）模式：根据每个项目的单独定价和报名人数进行计算。
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/// 将每个报名项目的单价相加得到单人总费用，再乘以报名人数得出最终金额
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/// </summary>
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private static void CalculateUnitPriceProjectMode(PricingResult result, PricingInput input)
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{
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decimal totalProjectPrice = 0;
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foreach (var project in input.Projects)
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{
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totalProjectPrice += project.UnitPrice;
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result.Details.Add(new PricingDetailItem
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{
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ItemName = project.ProjectName,
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UnitPrice = project.UnitPrice,
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Quantity = 1,
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Subtotal = project.UnitPrice,
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Remark = "项目单价"
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});
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result.CalculationLogs.Add($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] 项目: {project.ProjectName}, 单价: {project.UnitPrice:F2} 元");
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}
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var totalAmount = totalProjectPrice * input.ParticipantCount;
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result.TotalAmount = totalAmount;
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// 添加汇总项
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result.Details.Add(new PricingDetailItem
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{
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ItemName = input.ParticipantCount == 1 ? "项目总价" : "项目总价 × 人数",
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UnitPrice = totalProjectPrice,
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Quantity = input.ParticipantCount,
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Subtotal = totalAmount,
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Remark = input.ParticipantCount == 1
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? $"个人参赛，项目总价 {totalProjectPrice:F2} 元"
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: $"团队参赛，({totalProjectPrice:F2} 元) × {input.ParticipantCount} 人"
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});
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result.CalculationLogs.Add($"[{DateTime.Now:yyyy-MM-dd HH:mm:ss}] 单价（项目）模式: 项目总价 {totalProjectPrice:F2} 元 × {input.ParticipantCount} 人 = {totalAmount:F2} 元");
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}
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}
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