using System.Globalization;
using System.IO;
using Housing.Models;

namespace Housing.Services;

public static class InspectionSettingsStore
{
    public static InspectionJudgementSettings Load(string filePath)
    {
        if (!File.Exists(filePath))
        {
            var defaultSettings = new InspectionJudgementSettings();
            Save(filePath, defaultSettings);
            return defaultSettings;
        }

        var values = IniFile.LoadSection(filePath, "Judgement");
        return new InspectionJudgementSettings
        {
            VMin = GetDecimal(values, "VMin", 0.00m),
            VMax = GetDecimal(values, "VMax", 9.99m),
            AMin = GetDecimal(values, "AMin", 0.00m),
            AMax = GetDecimal(values, "AMax", 9.99m),
            RMin = GetOptionalDecimal(values, "RMin"),
            RMax = GetOptionalDecimal(values, "RMax")
        };
    }

    public static void Save(string filePath, InspectionJudgementSettings settings)
    {
        var lines = new[]
        {
            "[Judgement]",
            $"VMin={Format(settings.VMin)}",
            $"VMax={Format(settings.VMax)}",
            $"AMin={Format(settings.AMin)}",
            $"AMax={Format(settings.AMax)}",
            $"RMin={(settings.RMin.HasValue ? Format(settings.RMin.Value) : string.Empty)}",
            $"RMax={(settings.RMax.HasValue ? Format(settings.RMax.Value) : string.Empty)}"
        };

        File.WriteAllLines(filePath, lines);
    }

    private static decimal GetDecimal(Dictionary<string, string> values, string key, decimal defaultValue)
    {
        if (!values.TryGetValue(key, out var value))
        {
            return defaultValue;
        }

        return decimal.TryParse(value, NumberStyles.Number, CultureInfo.InvariantCulture, out var result)
            ? result
            : defaultValue;
    }

    private static string Format(decimal value)
    {
        return value.ToString("0.############################", CultureInfo.InvariantCulture);
    }

    private static decimal? GetOptionalDecimal(Dictionary<string, string> values, string key)
    {
        return values.TryGetValue(key, out var text) &&
               decimal.TryParse(text, NumberStyles.Number, CultureInfo.InvariantCulture, out var value)
            ? value : null;
    }
}