namespace YD_Event.Application.Scoring;

/// <summary>从已保存的计算快照读取展示值，不能在查询时静默重算历史成绩。</summary>
public static class ScoreDisplayService
{
    /// <summary>按角色格式化本人得分，主裁系数保留三位。</summary>
    public static string JudgeText(EventJudgeScoreSheet sheet, bool isFactorTotal) =>
        sheet.IsDisqualified ? "DQ" : JudgeValue(sheet, isFactorTotal).ToString(
            isFactorTotal && JudgeRoleSchemaService.NormalizeRoleType(sheet.JudgeRoleType) == "T" ? "F3" : "F2",
            System.Globalization.CultureInfo.InvariantCulture);

    /// <summary>本裁判分值；主裁为本人的系数预览，综合M以成绩快照为准。</summary>
    public static decimal JudgeValue(EventJudgeScoreSheet sheet, bool isFactorTotal)
    {
        if (!isFactorTotal) return sheet.TotalScore;
        var role = JudgeRoleSchemaService.NormalizeRoleType(sheet.JudgeRoleType);
        if (role == "T") return Math.Max(0m, 1m - sheet.DeductionScore);
        if (role == "P") return sheet.PerformanceScore;
        return role.StartsWith("D", StringComparison.OrdinalIgnoreCase) ? sheet.DifficultyScore : sheet.TotalScore;
    }

    /// <summary>花样得分系数 M；非花样或缺少计算快照时不推断数值。</summary>
    public static decimal? DeductionFactor(string? calculationJson)
    {
        if (string.IsNullOrWhiteSpace(calculationJson)) return null;
        try
        {
            var root = JObject.Parse(calculationJson);
            return root["factors"] is JObject factors
                ? factors["m"]?.Value<decimal?>()
                : null;
        }
        catch (Exception ex) when (ex is JsonException or FormatException or InvalidCastException or OverflowException)
        {
            return null;
        }
    }
}