using System.Globalization;
using TakeoutSaaS.Application.App.Finance.Transactions.Dto;
using TakeoutSaaS.Domain.Finance.Enums;
using TakeoutSaaS.Domain.Finance.Models;
using TakeoutSaaS.Domain.Orders.Enums;
using TakeoutSaaS.Domain.Payments.Enums;

namespace TakeoutSaaS.Application.App.Finance.Transactions.Handlers;

/// <summary>
/// 交易流水映射与文案转换。
/// </summary>
internal static class FinanceTransactionMapping
{
    /// <summary>
    /// 生成交易复合标识。
    /// </summary>
    public static string BuildTransactionId(FinanceTransactionSourceType sourceType, long sourceId)
    {
        var sourceCode = sourceType switch
        {
            FinanceTransactionSourceType.PaymentRecord => "payment",
            FinanceTransactionSourceType.PaymentRefundRecord => "payment_refund",
            FinanceTransactionSourceType.RefundRequest => "refund_request",
            FinanceTransactionSourceType.StoredCardRechargeRecord => "stored_card_recharge",
            FinanceTransactionSourceType.MemberPointLedger => "member_point",
            _ => "unknown"
        };

        return $"{sourceCode}:{sourceId}";
    }

    /// <summary>
    /// 解析交易类型编码。
    /// </summary>
    public static string ToTransactionTypeCode(FinanceTransactionType transactionType)
    {
        return transactionType switch
        {
            FinanceTransactionType.Income => "income",
            FinanceTransactionType.Refund => "refund",
            FinanceTransactionType.StoredCardRecharge => "stored_card_recharge",
            FinanceTransactionType.PointRedeem => "point_redeem",
            _ => "unknown"
        };
    }

    /// <summary>
    /// 解析交易类型文案。
    /// </summary>
    public static string ToTransactionTypeText(FinanceTransactionType transactionType)
    {
        return transactionType switch
        {
            FinanceTransactionType.Income => "收入",
            FinanceTransactionType.Refund => "退款",
            FinanceTransactionType.StoredCardRecharge => "储值充值",
            FinanceTransactionType.PointRedeem => "积分抵扣",
            _ => "未知"
        };
    }

    /// <summary>
    /// 解析渠道文案。
    /// </summary>
    public static string ToChannelText(DeliveryType? deliveryType)
    {
        return deliveryType switch
        {
            DeliveryType.Delivery => "外卖",
            DeliveryType.Pickup => "自提",
            DeliveryType.DineIn => "堂食",
            _ => "—"
        };
    }

    /// <summary>
    /// 解析支付方式文案。
    /// </summary>
    public static string ToPaymentMethodText(PaymentMethod? paymentMethod)
    {
        return paymentMethod switch
        {
            PaymentMethod.WeChatPay => "微信",
            PaymentMethod.Alipay => "支付宝",
            PaymentMethod.Cash => "现金",
            PaymentMethod.Card => "刷卡",
            PaymentMethod.Balance => "储值余额",
            _ => "—"
        };
    }

    /// <summary>
    /// 映射列表行。
    /// </summary>
    public static FinanceTransactionListItemDto ToListItem(FinanceTransactionRecord source)
    {
        return new FinanceTransactionListItemDto
        {
            TransactionId = BuildTransactionId(source.SourceType, source.SourceId),
            TransactionNo = source.TransactionNo ?? string.Empty,
            OrderNo = source.OrderNo,
            TransactionType = ToTransactionTypeCode(source.TransactionType),
            TransactionTypeText = ToTransactionTypeText(source.TransactionType),
            ChannelText = ToChannelText(source.DeliveryType),
            PaymentMethodText = ToPaymentMethodText(source.PaymentMethod),
            AmountSigned = decimal.Round(source.AmountSigned, 2, MidpointRounding.AwayFromZero),
            OccurredAt = source.OccurredAt,
            Remark = string.IsNullOrWhiteSpace(source.Remark) ? "—" : source.Remark.Trim(),
            IsIncome = source.AmountSigned > 0
        };
    }

    /// <summary>
    /// 映射详情。
    /// </summary>
    public static FinanceTransactionDetailDto ToDetail(FinanceTransactionRecord source)
    {
        return new FinanceTransactionDetailDto
        {
            TransactionId = BuildTransactionId(source.SourceType, source.SourceId),
            TransactionNo = source.TransactionNo ?? string.Empty,
            TransactionType = ToTransactionTypeCode(source.TransactionType),
            TransactionTypeText = ToTransactionTypeText(source.TransactionType),
            StoreId = source.StoreId,
            OrderNo = source.OrderNo,
            ChannelText = ToChannelText(source.DeliveryType),
            PaymentMethodText = ToPaymentMethodText(source.PaymentMethod),
            AmountSigned = decimal.Round(source.AmountSigned, 2, MidpointRounding.AwayFromZero),
            OccurredAt = source.OccurredAt,
            Remark = string.IsNullOrWhiteSpace(source.Remark) ? "—" : source.Remark.Trim(),
            CustomerName = string.IsNullOrWhiteSpace(source.CustomerName) ? "—" : source.CustomerName.Trim(),
            CustomerPhone = string.IsNullOrWhiteSpace(source.CustomerPhone) ? "—" : source.CustomerPhone.Trim(),
            RefundNo = source.RefundNo,
            RefundReason = source.RefundReason,
            MemberName = source.MemberName,
            MemberMobileMasked = source.MemberMobileMasked,
            RechargeAmount = source.RechargeAmount,
            GiftAmount = source.GiftAmount,
            ArrivedAmount = source.ArrivedAmount,
            PointChangeAmount = source.PointChangeAmount,
            PointBalanceAfterChange = source.PointBalanceAfterChange
        };
    }

    /// <summary>
    /// 导出金额文本。
    /// </summary>
    public static string FormatAmount(decimal amountSigned)
    {
        var rounded = decimal.Round(amountSigned, 2, MidpointRounding.AwayFromZero);
        var sign = rounded >= 0 ? "+" : string.Empty;
        return $"{sign}{rounded.ToString("0.00", CultureInfo.InvariantCulture)}";
    }
}