using System.Globalization;
using System.Text.RegularExpressions;

namespace JiDangJia.Core;

public sealed record ConsignmentFees(decimal Service,decimal Storage,decimal Proceeds)
{
    public decimal Total => Service+Storage;
}

public static class Consignment
{
    public static void ValidateExpected(string value)
    {
        if(string.IsNullOrWhiteSpace(value))return;
        var match=Regex.Match(value.Trim(),@"^(\d+(?:\.\d{1,2})?)\s*(?:[-–—~～至]\s*(\d+(?:\.\d{1,2})?))?$");
        if(!match.Success)throw new ArgumentException("客户期望金额请填写金额或区间，例如 4500-5000");
        if(!decimal.TryParse(match.Groups[1].Value,NumberStyles.Number,CultureInfo.InvariantCulture,out var low) || !decimal.TryParse(match.Groups[2].Success?match.Groups[2].Value:match.Groups[1].Value,NumberStyles.Number,CultureInfo.InvariantCulture,out var high))throw new ArgumentException("客户期望金额超出范围");
        if(low<=0 || high<low || high>999999999)throw new ArgumentException("客户期望金额应大于零，区间上限不能小于下限");
    }
    public static ConsignmentFees Calculate(DbRow row,bool requireSale=false)
    {
        var amount=row.Money("amount");var storage=row.Money("storageFee");var mode=row.Text("serviceFeeMode");var value=row.Money("serviceFeeValue");
        if(amount<0 || amount>999999999 || storage<0 || storage>999999999 || value<0 || value>999999999)throw new ArgumentException("成交金额和费用应在 0 至 999,999,999 之间");
        if(mode.Length>0 && mode is not ("FIXED" or "PERCENT"))throw new ArgumentException("请选择寄卖服务费收取方式");
        if(mode=="PERCENT" && value>100)throw new ArgumentException("寄卖服务费比例应在 0% 至 100% 之间");
        var service=mode=="PERCENT"?Fees.Round(amount*value/100):mode=="FIXED"?Fees.Round(value):row.Money("commission");
        if(service<0)throw new ArgumentException("服务费不能为负数");
        if(requireSale)BusinessService.Positive(amount,"实际成交金额");
        if((requireSale || amount>0) && service+storage>amount)throw new ArgumentException("服务费和保管费合计不能超过实际成交金额");
        return new(service,Fees.Round(storage),Fees.Round(amount-service-storage));
    }
}