using System;
using System.Text.RegularExpressions;
using Microsoft.Xna.Framework;
using Newtonsoft.Json.Linq;
using StardewModdingAPI.Framework.Exceptions;

namespace StardewModdingAPI.Framework.Serialisation.CrossplatformConverters
{
    /// <summary>Handles deserialisation of <see cref="Rectangle"/> for crossplatform compatibility.</summary>
    /// <remarks>
    /// - Linux/Mac format: { "X": 1, "Y": 2, "Width": 3, "Height": 4 }
    /// - Windows format:   "{X:1 Y:2 Width:3 Height:4}"
    /// </remarks>
    internal class RectangleConverter : SimpleReadOnlyConverter<Rectangle>
    {
        /*********
        ** Protected methods
        *********/
        /// <summary>Read a JSON object.</summary>
        /// <param name="obj">The JSON object to read.</param>
        /// <param name="path">The path to the current JSON node.</param>
        protected override Rectangle ReadObject(JObject obj, string path)
        {
            int x = obj.ValueIgnoreCase<int>(nameof(Rectangle.X));
            int y = obj.ValueIgnoreCase<int>(nameof(Rectangle.Y));
            int width = obj.ValueIgnoreCase<int>(nameof(Rectangle.Width));
            int height = obj.ValueIgnoreCase<int>(nameof(Rectangle.Height));
            return new Rectangle(x, y, width, height);
        }

        /// <summary>Read a JSON string.</summary>
        /// <param name="str">The JSON string value.</param>
        /// <param name="path">The path to the current JSON node.</param>
        protected override Rectangle ReadString(string str, string path)
        {
            if (string.IsNullOrWhiteSpace(str))
                return Rectangle.Empty;

            var match = Regex.Match(str, @"^\{X:(?<x>\d+) Y:(?<y>\d+) Width:(?<width>\d+) Height:(?<height>\d+)\}$", RegexOptions.IgnoreCase);
            if (!match.Success)
                throw new SParseException($"Can't parse {typeof(Rectangle).Name} from invalid value '{str}' (path: {path}).");

            int x = Convert.ToInt32(match.Groups["x"].Value);
            int y = Convert.ToInt32(match.Groups["y"].Value);
            int width = Convert.ToInt32(match.Groups["width"].Value);
            int height = Convert.ToInt32(match.Groups["height"].Value);

            return new Rectangle(x, y, width, height);
        }
    }
}