using System.Text.Json.Serialization;

namespace ParadoxSaveParser.WebAPI;

public class Config
{
    [JsonIgnore]
    public const int ActualVersion = 1;
    public int Version { get; set; } = ActualVersion;
    public string BaseUrl { get; set; } = "http://127.0.0.1:5226/";
    public int UploadLifetimeDays { get; set; } = 30;
    public string DbPath { get; set; } = "database.sqlite";
    public SaveUploadConfig SaveUpload { get; set; } = new();

    public class SaveUploadConfig
    {
        /// max size of game data entry after decompression
        public long MaxSizePlainTextBytes { get; set; } = 200 * 1024 * 1024;
        /// max size of uploaded .tar.zst
        public long MaxSizeCompressedBytes { get; set; } = 60 * 1024 * 1024;
    }

    public static JsonSerializerOptions JsonOptions = new()
    {
        WriteIndented = false,
        MaxDepth = 1024,
        DefaultIgnoreCondition = JsonIgnoreCondition.WhenWritingNull,
    };

    public static Config Load(IOPath configPath)
    {
        var cfg = JsonSerializer.Deserialize<Config>(File.ReadAllText(configPath))
            ?? throw new Exception("Could not parse config file");
        if (cfg.Version < ActualVersion)
            throw new Exception($"config is obsolete (config v{cfg.Version} < program v{ActualVersion})");
        if (cfg.Version > ActualVersion)
            throw new Exception($"program is obsolete (config v{cfg.Version} > program v{ActualVersion})");
        return cfg;
    }

    public override string ToString() => JsonSerializer.Serialize(this, JsonOptions);

    public void Save(IOPath configPath)
    {
        File.WriteAllText(configPath, ToString());
    }
}