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using System;
using System.Collections.Generic;
using NGit;
using NGit.Api;
using NGit.Api.Errors;
using NGit.Errors;
using NGit.Internal;
using NGit.Transport;
using Sharpen;

namespace NGit.Api
{
	/// <summary>
	/// A class used to execute a
	/// <code>Fetch</code>
	/// command. It has setters for all
	/// supported options and arguments of this command and a
	/// <see cref="Call()">Call()</see>
	/// method
	/// to finally execute the command.
	/// </summary>
	/// <seealso><a href="http://www.kernel.org/pub/software/scm/git/docs/git-fetch.html"
	/// *      >Git documentation about Fetch</a></seealso>
	public class FetchCommand : TransportCommand<NGit.Api.FetchCommand, FetchResult>
	{
		private string remote = Constants.DEFAULT_REMOTE_NAME;

		private IList<RefSpec> refSpecs;

		private ProgressMonitor monitor = NullProgressMonitor.INSTANCE;

		private bool checkFetchedObjects;

		private bool removeDeletedRefs;

		private bool dryRun;

		private bool thin = NGit.Transport.Transport.DEFAULT_FETCH_THIN;

		private TagOpt tagOption;

		/// <param name="repo"></param>
		protected internal FetchCommand(Repository repo) : base(repo)
		{
			refSpecs = new AList<RefSpec>(3);
		}

		/// <summary>
		/// Executes the
		/// <code>fetch</code>
		/// command with all the options and parameters
		/// collected by the setter methods of this class. Each instance of this
		/// class should only be used for one invocation of the command (means: one
		/// call to
		/// <see cref="Call()">Call()</see>
		/// )
		/// </summary>
		/// <returns>
		/// a
		/// <see cref="NGit.Transport.FetchResult">NGit.Transport.FetchResult</see>
		/// object representing the successful fetch
		/// result
		/// </returns>
		/// <exception cref="NGit.Api.Errors.InvalidRemoteException">when called with an invalid remote uri
		/// 	</exception>
		/// <exception cref="NGit.Api.Errors.TransportException">when an error occurs during transport
		/// 	</exception>
		/// <exception cref="NGit.Api.Errors.GitAPIException"></exception>
		public override FetchResult Call()
		{
			CheckCallable();
			try
			{
				NGit.Transport.Transport transport = NGit.Transport.Transport.Open(repo, remote);
				try
				{
					transport.SetCheckFetchedObjects(checkFetchedObjects);
					transport.SetRemoveDeletedRefs(removeDeletedRefs);
					transport.SetDryRun(dryRun);
					if (tagOption != null)
					{
						transport.SetTagOpt(tagOption);
					}
					transport.SetFetchThin(thin);
					Configure(transport);
					FetchResult result = transport.Fetch(monitor, refSpecs);
					return result;
				}
				finally
				{
					transport.Close();
				}
			}
			catch (NoRemoteRepositoryException e)
			{
				throw new InvalidRemoteException(MessageFormat.Format(JGitText.Get().invalidRemote
					, remote), e);
			}
			catch (NGit.Errors.TransportException e)
			{
				throw new NGit.Errors.TransportException(e.Message, e);
			}
			catch (URISyntaxException)
			{
				throw new InvalidRemoteException(MessageFormat.Format(JGitText.Get().invalidRemote
					, remote));
			}
			catch (NGit.Errors.NotSupportedException e)
			{
				throw new JGitInternalException(JGitText.Get().exceptionCaughtDuringExecutionOfFetchCommand
					, e);
			}
		}

		/// <summary>The remote (uri or name) used for the fetch operation.</summary>
		/// <remarks>
		/// The remote (uri or name) used for the fetch operation. If no remote is
		/// set, the default value of <code>Constants.DEFAULT_REMOTE_NAME</code> will
		/// be used.
		/// </remarks>
		/// <seealso cref="NGit.Constants.DEFAULT_REMOTE_NAME">NGit.Constants.DEFAULT_REMOTE_NAME
		/// 	</seealso>
		/// <param name="remote"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetRemote(string remote)
		{
			CheckCallable();
			this.remote = remote;
			return this;
		}

		/// <returns>the remote used for the remote operation</returns>
		public virtual string GetRemote()
		{
			return remote;
		}

		/// <returns>the timeout used for the fetch operation</returns>
		public virtual int GetTimeout()
		{
			return timeout;
		}

		/// <returns>whether to check received objects checked for validity</returns>
		public virtual bool IsCheckFetchedObjects()
		{
			return checkFetchedObjects;
		}

		/// <summary>If set to true, objects received will be checked for validity</summary>
		/// <param name="checkFetchedObjects"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetCheckFetchedObjects(bool checkFetchedObjects
			)
		{
			CheckCallable();
			this.checkFetchedObjects = checkFetchedObjects;
			return this;
		}

		/// <returns>whether or not to remove refs which no longer exist in the source</returns>
		public virtual bool IsRemoveDeletedRefs()
		{
			return removeDeletedRefs;
		}

		/// <summary>If set to true, refs are removed which no longer exist in the source</summary>
		/// <param name="removeDeletedRefs"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetRemoveDeletedRefs(bool removeDeletedRefs)
		{
			CheckCallable();
			this.removeDeletedRefs = removeDeletedRefs;
			return this;
		}

		/// <returns>the progress monitor for the fetch operation</returns>
		public virtual ProgressMonitor GetProgressMonitor()
		{
			return monitor;
		}

		/// <summary>The progress monitor associated with the fetch operation.</summary>
		/// <remarks>
		/// The progress monitor associated with the fetch operation. By default,
		/// this is set to <code>NullProgressMonitor</code>
		/// </remarks>
		/// <seealso cref="NGit.NullProgressMonitor">NGit.NullProgressMonitor</seealso>
		/// <param name="monitor"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetProgressMonitor(ProgressMonitor monitor)
		{
			CheckCallable();
			this.monitor = monitor;
			return this;
		}

		/// <returns>the ref specs</returns>
		public virtual IList<RefSpec> GetRefSpecs()
		{
			return refSpecs;
		}

		/// <summary>The ref specs to be used in the fetch operation</summary>
		/// <param name="specs"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetRefSpecs(params RefSpec[] specs)
		{
			CheckCallable();
			this.refSpecs.Clear();
			foreach (RefSpec spec in specs)
			{
				refSpecs.AddItem(spec);
			}
			return this;
		}

		/// <summary>The ref specs to be used in the fetch operation</summary>
		/// <param name="specs"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetRefSpecs(IList<RefSpec> specs)
		{
			CheckCallable();
			this.refSpecs.Clear();
			Sharpen.Collections.AddAll(this.refSpecs, specs);
			return this;
		}

		/// <returns>the dry run preference for the fetch operation</returns>
		public virtual bool IsDryRun()
		{
			return dryRun;
		}

		/// <summary>Sets whether the fetch operation should be a dry run</summary>
		/// <param name="dryRun"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetDryRun(bool dryRun)
		{
			CheckCallable();
			this.dryRun = dryRun;
			return this;
		}

		/// <returns>the thin-pack preference for fetch operation</returns>
		public virtual bool IsThin()
		{
			return thin;
		}

		/// <summary>Sets the thin-pack preference for fetch operation.</summary>
		/// <remarks>
		/// Sets the thin-pack preference for fetch operation.
		/// Default setting is Transport.DEFAULT_FETCH_THIN
		/// </remarks>
		/// <param name="thin"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetThin(bool thin)
		{
			CheckCallable();
			this.thin = thin;
			return this;
		}

		/// <summary>Sets the specification of annotated tag behavior during fetch</summary>
		/// <param name="tagOpt"></param>
		/// <returns>
		/// 
		/// <code>this</code>
		/// </returns>
		public virtual NGit.Api.FetchCommand SetTagOpt(TagOpt tagOpt)
		{
			CheckCallable();
			this.tagOption = tagOpt;
			return this;
		}
	}
}