using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.Linq;
using UAF;
using UAF.WPF.Models;

namespace DataFileAnalyzer
{
    /// <summary>
    /// A dependency to a data file.
    /// </summary>
    public class DataFileDependency : ListViewItemData
    {
        /// <summary>
        /// Normalized path of the target file
        /// </summary>
        public string Path { get; set; }

        /// <summary>
        /// Key of the target file if it exists
        /// </summary>
        public DataFileKey Key { get; set; }

        /// <summary>
        /// On which platform this dependency exists
        /// </summary>
        public HashSet<Platform> Platforms { get; set; }

        /// <summary>
        /// Constructor
        /// </summary>
        public DataFileDependency()
        {
            Key = DataFileKey.Invalid;
            Platforms = new HashSet<Platform>();
        }

        /// <summary>
        /// Save in an XML element
        /// </summary>
        public bool Save(XElement _element)
        {
            _element.SetAttributeValue("Path", Path);
            DataFileKey.Save(Key, _element);
            _element.SetAttributeValue("Missing", Missing);

            if (Platforms.Count != 0)
            {
                string platformListString = string.Join(",",
                    Enum.GetValues(typeof (PlatformId)).Cast<PlatformId>().Select(x => new Platform(x).Name));
                _element.SetAttributeValue("Platforms", platformListString);
            }

            return true;
        }

        /// <summary>
        /// Load from an XML element
        /// </summary>
        public bool Load(XElement _element)
        {
            bool result = true;

            Path = _element.Attribute("Path").Value;
            Key = DataFileKey.Load(_element);
            Missing = Convert.ToBoolean(_element.Attribute("Missing").Value);

            XAttribute attr = _element.Attribute("Platforms");
            if (attr != null && !string.IsNullOrEmpty(attr.Value))
            {
                string listString = attr.Value;
                foreach(string platformName in listString.Split(','))
                {
                    Platform platform = new Platform(platformName);
                    result &= (platform.Id != PlatformId.UNDEFINED);
                    Platforms.Add(platform);
                }
            }

            return result;
        }

        /// <summary>
        /// Is the dependency valid
        /// </summary>
        public bool IsValid { get { return !Key.IsInvalid() && !Missing; } }

        /// <summary>
        /// Is the dependency missing
        /// </summary>
        public bool Missing { get; set; }
    }
}