namespace Admin.NET.Plugin.AiDOP.Supply;

public static class NumberRuleFormatter
{
    public static int ResolveSerialWidth(int? maxValue)
    {
        if (!maxValue.HasValue || maxValue.Value <= 0) return 4;
        return Math.Max(1, maxValue.Value.ToString().Length);
    }

    public static string BuildNumber(string? prefix1, string? prefix2, string? prefix3, string? dateType, bool? isDateType, int serial, int? maxValue, DateTime now)
    {
        var prefix = BuildPrefix(prefix1, prefix2, prefix3, dateType, isDateType, now);
        return $"{prefix}{serial.ToString().PadLeft(ResolveSerialWidth(maxValue), '0')}";
    }

    public static string BuildPrefix(string? prefix1, string? prefix2, string? prefix3, string? dateType, bool? isDateType, DateTime now)
    {
        var prefix = string.Concat(
            prefix1?.Trim(),
            prefix2?.Trim(),
            prefix3?.Trim());

        if (isDateType == true || !string.IsNullOrWhiteSpace(dateType))
            prefix += FormatDatePart(dateType, now);

        return prefix;
    }

    public static string FormatDatePart(string? dateType, DateTime now)
    {
        var normalized = (dateType ?? string.Empty).Trim().ToUpperInvariant();
        return normalized switch
        {
            "YYYYMMDD" => now.ToString("yyyyMMdd"),
            "YYMMDD" => now.ToString("yyMMdd"),
            "YYYYMM" => now.ToString("yyyyMM"),
            "YYMM" => now.ToString("yyMM"),
            "YYYY" => now.ToString("yyyy"),
            "MMDD" => now.ToString("MMdd"),
            _ => normalized
                .Replace("YYYY", now.ToString("yyyy"))
                .Replace("YY", now.ToString("yy"))
                .Replace("MM", now.ToString("MM"))
                .Replace("DD", now.ToString("dd"))
        };
    }

    public static DateTime? ResolveSequenceDate(string? dateType, bool? isDateType, DateTime now)
    {
        var normalized = (dateType ?? string.Empty).Trim().ToUpperInvariant();
        if (isDateType != true && string.IsNullOrWhiteSpace(normalized)) return null;

        return normalized switch
        {
            "YY" or "YYYY" => new DateTime(now.Year, 1, 1),
            "YYMM" or "YYYYMM" => new DateTime(now.Year, now.Month, 1),
            _ => now.Date
        };
    }
}