namespace Admin.NET.Plugin.AiDOP.Infrastructure;

/// <summary>
/// L1/L2 合并：期量差与绿黄红（指标模型总方案 03）。
/// 阈值含义（以达标比例%表示）：
///   higher_is_better: 绿 actual/target >= 100%；黄 >= yellowPct；红 &lt; redPct
///   lower_is_better:  绿 actual/target &lt;= 100%；黄 &lt;= yellowPct；红 > redPct
/// 默认值：higher (95/80)  lower (110/120)
/// </summary>
public static class AidopS4KpiMerge
{
    public const string Green = "green";
    public const string Yellow = "yellow";
    public const string Red = "red";

    public static string AchievementLevel(
        decimal? current, decimal? target, string direction,
        decimal? yellowThreshold = null, decimal? redThreshold = null)
    {
        if (current == null || target == null)
            return Yellow;
        var c = current.Value;
        var t = target.Value;
        if (t == 0) return Yellow;

        if (direction == "lower_is_better")
        {
            var yPct = yellowThreshold ?? 110m;
            var rPct = redThreshold ?? 120m;
            if (c <= t) return Green;
            if (c <= t * yPct / 100m) return Yellow;
            return Red;
        }

        // higher_is_better
        {
            var yPct = yellowThreshold ?? 95m;
            var rPct = redThreshold ?? 80m;
            if (c >= t) return Green;
            if (c >= t * yPct / 100m) return Yellow;
            return Red;
        }
    }

    /// <summary>期量差数值（当前−目标）；展示用箭头与符号在调用方处理。</summary>
    public static decimal? GapValue(decimal? current, decimal? target)
    {
        if (current == null || target == null) return null;
        return current.Value - target.Value;
    }

    public static string GapArrow(decimal? gap)
    {
        if (gap == null) return "flat";
        return gap.Value >= 0 ? "up" : "down";
    }
}