using YLErp.Modules.AppModule;
using YLErp.Models;

namespace YLErp.Modules.SwapModule
{
    public static class SwapMarginTemplateConfigService
    {
        public const string ConfigName = "Trade.SwapMarginTemplateConfig";

        public const string DefaultConfigJson = @"{
  ""options"": [
    { ""text"": ""授信保证金"", ""value"": ""授信保证金"" },
    { ""text"": ""现金保证金"", ""value"": ""现金保证金"" }
  ],
  ""defaultValue"": ""现金保证金""
}";

        public static SwapMarginTemplateConfig GetConfig()
        {
            var json = AppManager.GetAppConfigValue("ProjectConfig", ConfigName);
            return TryParse(json, out var config, out _) ? config : GetDefaultConfig();
        }

        public static bool TryValidate(string json, out string error)
        {
            return TryParse(json, out _, out error);
        }

        private static SwapMarginTemplateConfig GetDefaultConfig()
        {
            return JsonHelper.Deserialize<SwapMarginTemplateConfig>(DefaultConfigJson);
        }

        private static bool TryParse(string json, out SwapMarginTemplateConfig config, out string error)
        {
            config = null;
            error = null;

            try
            {
                config = JsonHelper.Deserialize<SwapMarginTemplateConfig>(json);
            }
            catch (Exception)
            {
                error = "保证金模板配置不是有效的 JSON";
                return false;
            }

            var items = config?.options?
                .Where(item => item != null && !string.IsNullOrWhiteSpace(item.Value))
                .ToArray();
            if (items == null || items.Length == 0)
            {
                error = "保证金模板配置至少需要一个有效选项";
                return false;
            }
            if (items.Select(item => item.Value).Distinct(StringComparer.OrdinalIgnoreCase).Count() != items.Length)
            {
                error = "保证金模板配置的选项值不能重复";
                return false;
            }
            var defaultValue = config.defaultValue;
            if (!items.Any(item => item.Value == defaultValue))
            {
                error = "保证金模板默认值必须在选项中";
                return false;
            }

            config.options = items;
            return true;
        }
    }

    public class SwapMarginTemplateConfig
    {
        public IEnumerable<SelectItem> options { get; set; }

        public string defaultValue { get; set; }
    }
}