namespace ALttPRandomizer.Serialization {
    using System;
    using System.Text;
    using System.Threading.Tasks;
    using Microsoft.AspNetCore.Mvc.Formatters;
    using Microsoft.Extensions.Logging;
    using Microsoft.Net.Http.Headers;
    using YamlDotNet.Serialization;

    public class YamlInputFormatter : TextInputFormatter {
        private IDeserializer Deserializer { get; }
        private ILogger<YamlInputFormatter> Logger { get; }

        public YamlInputFormatter(IDeserializer deserializer, ILogger<YamlInputFormatter> logger) {
            this.Deserializer = deserializer;
            this.Logger = logger;

            this.SupportedEncodings.Add(Encoding.UTF8);
            this.SupportedEncodings.Add(Encoding.Unicode);
            this.SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("application/yaml"));
            this.SupportedMediaTypes.Add(MediaTypeHeaderValue.Parse("text/yaml"));
        }

        public override async Task<InputFormatterResult> ReadRequestBodyAsync(InputFormatterContext context, Encoding encoding) {
            var request = context.HttpContext.Request;

            using var reader = context.ReaderFactory(request.Body, encoding);
            var type = context.ModelType;

            try {
                var content = await reader.ReadToEndAsync();
                var model = this.Deserializer.Deserialize(content, type);
                return await InputFormatterResult.SuccessAsync(model);
            } catch (Exception ex) {
                this.Logger.LogInformation(ex, "Error parsing YAML");
                return await InputFormatterResult.FailureAsync();
            }
        }
    }
}