#region License
/*
MIT License

Copyright(c) 2020 Petteri Kautonen

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
#endregion

using System.Drawing;
using System.Xml.Linq;

namespace VPKSoft.ScintillaLexers.ScintillaNotepadPlusPlus
{
    /// <summary>
    /// A helper class for Notepad++ XML style definition files.
    /// </summary>
    public class XmlStyleNotepadPlusPlusHelper
    {
        /// <summary>
        /// Gets or sets the name of the style definition.
        /// </summary>
        public string Name { get; set; }

        /// <summary>
        /// Gets or sets a value indicating whether the style definition defines a fond as bold.
        /// </summary>
        public bool Bold { get; set;}

        /// <summary>
        /// Gets or sets a value indicating whether the style definition defines a fond as italic.
        /// </summary>
        public  bool Italic { get; set;}

        /// <summary>
        /// Gets or sets the style identifier from a style definition.
        /// </summary>
        public int StyleId { get; set; }

        /// <summary>
        /// Gets or sets the foreground color of a font from a style definition.
        /// </summary>
        public Color ColorForeground { get; set; }

        /// <summary>
        /// Gets or sets the background color of a font from a style definition.
        /// </summary>
        public Color ColorBackground { get; set; }

        /// <summary>
        /// Gets or sets the name of the font from a style definition.
        /// </summary>
        public string FontName { get; set; }

        /// <summary>
        /// Gets or sets the size of the font from a style definition.
        /// </summary>
        public int FontSize { get; set; }

        /// <summary>
        /// Gets the attribute value of a given <see cref="XElement"/>.
        /// </summary>
        /// <param name="element">The element to get the attribute from.</param>
        /// <param name="attributeName">Name of the attribute.</param>
        /// <param name="defaultValue">The default value for the attribute in case the attribute is null or the value is empty.</param>
        /// <returns>The <see cref="XAttribute"/> value based on given parameters if successful; otherwise <paramref name="defaultValue"/>.</returns>
        private static string GetAttributeValue(XElement element, string attributeName, string defaultValue = "")
        {
            var attribute = element.Attribute(attributeName);
            if (attribute == null)
            {
                return defaultValue;
            }
            
            if (attribute.Value.Trim() != string.Empty)
            {
                return attribute.Value.Trim();
            }

            return defaultValue;
        }

        /// <summary>
        /// Gets the attribute value of a given <see cref="XElement"/> as a <see cref="Color"/>.
        /// </summary>
        /// <param name="element">The element to get the color attribute from.</param>
        /// <param name="attributeName">Name of the attribute.</param>
        /// <returns>A color if the operation was successful; otherwise Color.Empty.</returns>
        private static Color GetAttributeAsColor(XElement element, string attributeName)
        {
            var attribute = element.Attribute(attributeName);
            if (attribute == null)
            {
                return Color.Empty;
            }
            
            if (attribute.Value.Trim() == string.Empty)
            {
                return Color.Empty;
            }

            try
            {
                return ColorTranslator.FromHtml("#" + element.Attribute(attributeName)?.Value);
            }
            catch
            {
                return Color.Empty;
            } 
        }

        /// <summary>
        /// Creates a new instance of this class based on the given <see cref="XElement"/>
        /// </summary>
        /// <param name="element">The element to get the style definition from.</param>
        /// <returns>A <see cref="XmlStyleNotepadPlusPlusHelper"/> class instance filled with the style definition data.</returns>
        public static XmlStyleNotepadPlusPlusHelper FromXElement(XElement element)
        {
            return new XmlStyleNotepadPlusPlusHelper
            {
                Name = GetAttributeValue(element, "name", "None"),
                Bold = int.Parse(GetAttributeValue(element, "fontStyle", "0")) == 1,
                Italic = int.Parse(GetAttributeValue(element, "fontStyle", "0")) == 2,
                StyleId = int.Parse(GetAttributeValue(element, "styleID", "0")),
                ColorForeground = GetAttributeAsColor(element, "fgColor"),
                ColorBackground = GetAttributeAsColor(element, "bgColor"),
                FontName = GetAttributeValue(element, "fontName", "Consolas"),
                FontSize = int.Parse(GetAttributeValue(element, "fontSize", "10")),
            };
        }
    }
}