// <copyright file="DataAnalysis.cs" company="Largo">
// Copyright (c) 2009 All Right Reserved
// </copyright>
// <author> vl </author>
// <email></email>
// <date>2009-01-01</date>
// <summary>Contains ...</summary>
namespace LargoCommon.Music
{
    using System;
    using System.Collections.Generic;
    using System.Diagnostics.Contracts;
    using System.IO;
    using System.Xml.Linq;
    using Support;

    /// <summary>
    /// Data Analysis.
    /// </summary>
    public class DataAnalysis
    {
        /// <summary>
        /// Singleton variable.
        /// </summary>
        private static readonly DataAnalysis InternalSingleton = new DataAnalysis();

        #region Constructors
        /// <summary>
        /// Prevents a default instance of the DataAnalysis class from being created.
        /// </summary>
        private DataAnalysis() {
        }
        #endregion

        #region Static properties
        /// <summary>
        /// Gets the ProcessLogger Singleton.
        /// </summary>
        /// <value> Property description. </value>
        public static DataAnalysis Singleton {
            get {
                Contract.Ensures(Contract.Result<DataAnalysis>() != null);
                if (InternalSingleton == null) {
                    throw new InvalidOperationException("Singleton DataAnalysis is null.");
                }

                return InternalSingleton;
            }
        }
        #endregion

        #region List Properties
        /// <summary>
        /// Gets or sets the orchestra blocks list.
        /// </summary>
        /// <value>
        /// The orchestra blocks list.
        /// </value>
        public List<OrchestraBlock> OrchestraBlockList { get; set; }

        #endregion

        #region Public methods OrchestraBlocks
        /// <summary>
        /// Loads the blocks.
        /// </summary>
        public void LoadOrchestraBlocks() {
            this.OrchestraBlockList = new List<OrchestraBlock>();
            var path = MusicalSettings.Singleton.Folders.GetFolder(MusicalFolder.UserData);
            var fileName = "OrchestraBlocks.xml";
            var filepath = Path.Combine(path, fileName);
            if (!File.Exists(filepath)) {
                return;
            }

            var xdoc = XDocument.Load(filepath);
            var root = xdoc.Root;
            if (root == null || root.Name != "OrchestraBlocks") {
                return;
            }

            var xlist = root;
            foreach (var xblock in xlist.Elements()) {
                OrchestraBlock block = new OrchestraBlock(xblock);
                if (block.Strip.OrchestraTracks.Count > 0) {
                    this.OrchestraBlockList.Add(block);
                }
            }
        }

        /// <summary>
        /// Saves the blocks.
        /// </summary>
        [JetBrains.Annotations.UsedImplicitlyAttribute]
        public void SaveOrchestraBlocks() {
            XElement xlist = new XElement("OrchestraBlocks");
            foreach (var block in this.OrchestraBlockList) {
                if (block.Strip.OrchestraTracks.Count == 0) {
                    continue;
                }

                var xblock = block.GetXElement;
                xlist.Add(xblock);
            }

            var xdoc = new XDocument(new XDeclaration("1.0", "utf-8", null), xlist);
            var path = MusicalSettings.Singleton.Folders.GetFolder(MusicalFolder.UserData);
            var fileName = "OrchestraBlocks.xml";
            var filepath = Path.Combine(path, fileName);
            xdoc.Save(filepath);
        }

        #endregion
    }
}