using System.Globalization;
using YY.Admin.Core.Entity;

namespace YY.Admin.Core.Util;

/// <summary>
/// 「已入场重量」桌面端本地累计计算器。
/// 与后端 IMesXslRawMaterialEntryService.sumEnteredWeightByBillNos 保持同一口径：
///   ① 把 totalPortions / portionWeight 按 "x/y/z/" 拆分
///   ② 逐位 (份数 × 每份重量) 累加，得到该 entry 的小计
///   ③ 同一榜单（BillNo）下所有 entry 的小计再次累加
/// 任一位置解析失败或缺失：静默跳过，保证 UI 降级可用。
/// </summary>
public static class EnteredWeightCalculator
{
    /// <summary>累计一条入场记录的小计。</summary>
    public static double SumOneEntry(string? totalPortions, string? portionWeight)
    {
        var portions = SplitJoined(totalPortions);
        var weights = SplitJoined(portionWeight);
        if (portions.Length == 0 || weights.Length == 0)
        {
            return 0d;
        }
        var n = Math.Min(portions.Length, weights.Length);
        double sum = 0d;
        for (var i = 0; i < n; i++)
        {
            if (!TryParse(portions[i], out var p) || !TryParse(weights[i], out var w))
            {
                continue;
            }
            sum += p * w;
        }
        return sum;
    }

    /// <summary>按 BillNo 分组累计「已入场重量」。返回 Dictionary&lt;BillNo, 总和&gt;。</summary>
    public static Dictionary<string, double> SumByBillNos(
        IEnumerable<MesXslRawMaterialEntry> entries,
        IEnumerable<string?> billNos)
    {
        var keys = new HashSet<string>(StringComparer.OrdinalIgnoreCase);
        foreach (var b in billNos)
        {
            if (!string.IsNullOrWhiteSpace(b)) keys.Add(b!);
        }
        var result = new Dictionary<string, double>(StringComparer.OrdinalIgnoreCase);
        if (keys.Count == 0)
        {
            return result;
        }

        foreach (var e in entries)
        {
            if (string.IsNullOrWhiteSpace(e.BillNo) || !keys.Contains(e.BillNo!))
            {
                continue;
            }
            var sub = SumOneEntry(e.TotalPortions, e.PortionWeight);
            if (sub == 0d)
            {
                continue;
            }
            if (result.TryGetValue(e.BillNo!, out var acc))
            {
                result[e.BillNo!] = acc + sub;
            }
            else
            {
                result[e.BillNo!] = sub;
            }
        }
        return result;
    }

    private static string[] SplitJoined(string? value)
    {
        // 兼容 "x/y/z" 与 "x/y/z/" 两种格式；过滤空段
        if (string.IsNullOrWhiteSpace(value))
        {
            return Array.Empty<string>();
        }
        return value.Split('/')
            .Select(s => s.Trim())
            .Where(s => s.Length > 0)
            .ToArray();
    }

    private static bool TryParse(string s, out double v) =>
        double.TryParse(s, NumberStyles.Float, CultureInfo.InvariantCulture, out v);
}