using System.Collections.Generic;

namespace Wayne.Lib
{
    /// <summary>
    /// Provides a version for the application. 
    /// </summary>
    public class VersionProvider : IVersionProvider
    {
        ///<summary>
        /// Constructor
        ///</summary>
        public VersionProvider()
        {
            ReleaseComponentVersion = new VersionNumber("0.0.0");
        }

        ///<summary>
        /// Main component version for the running process. Should be set in code as early as possible in the program.
        ///</summary>
        public VersionNumber ReleaseComponentVersion { get; set; }

        private readonly Dictionary<object, VersionNumber> internalDictionary = new Dictionary<object, VersionNumber>();
        private readonly object internalDictionaryLock = new object();

        /// <summary>
        /// Gets the version for a sub component.
        /// </summary>
        /// <typeparam name="TVersionIdentifier"></typeparam>
        /// <param name="versionIdentifier"></param>
        /// <returns></returns>
        public VersionNumber GetVersion<TVersionIdentifier>(TVersionIdentifier versionIdentifier)
        {
            VersionNumber result;
            lock (internalDictionary)
            {
                if (internalDictionary.TryGetValue(versionIdentifier, out result))
                    return result;
                
                return new VersionNumber("0.0.0");
            }
        }

        ///<summary>
        /// Sets the version for a sub component
        ///</summary>
        ///<param name="versionIdentifier"></param>
        ///<param name="versionNumber"></param>
        ///<typeparam name="TVersionIdentifier"></typeparam>
        public void SetVersion<TVersionIdentifier>(TVersionIdentifier versionIdentifier, VersionNumber versionNumber)
        {
            lock (internalDictionaryLock)
            {
                internalDictionary[versionIdentifier] = versionNumber;
            }
        }
    }
}