using System;

namespace NaGet.SubCommands
{
	#region EventHandler<NaGetTaskSetEventArgs>関連
	
	public class NaGetTaskSetEventArgs : NaGetEventArgs
	{
		public NaGetTaskSetEventType Type;
		
		public NaGetTaskSetEventArgs(NaGetTaskSetEventType type, string message, float processPercent)
		{
			this.Type = type;
			this.TaskMessage = message;
			this.TaskProgressPercent = processPercent;
		}
	}
	
	/// <summary>
	/// タスクの種類
	/// </summary>
	public enum NaGetTaskSetEventType
	{
		/// <summary>
		/// 開始
		/// </summary>
		STARTED,
		/// <summary>
		/// 完了した(すべてを完了)
		/// </summary>
		COMPLETED,
		/// <summary>
		/// 作業がキャンセルされた
		/// </summary>
		CANCELED,
		/// <summary>
		/// エラーを発生し(中断した)
		/// </summary>
		ERROR,
		/// <summary>
		/// エラーが発生したが継続
		/// </summary>
		WARNING,
		/// <summary>
		/// そのほかの情報
		/// </summary>
		INFO,
		/// <summary>
		/// 作業を開始
		/// </summary>
		STARTED_TASKSET,
		/// <summary>
		/// 作業を終了
		/// </summary>
		COMPLETED_TASKSET,
	}
	
	#endregion
	
	#region NaGetTaskQueryHandler関連
	
	public delegate NaGetTaskQueryResult NaGetTaskQueryHandler(object sender, NaGetTaskQueryArgs e);
	
	public class NaGetTaskQueryArgs
	{
		/// <summary>
		/// タスクの現況のメッセージ
		/// </summary>
		public string Message;
		
		/// <summary>
		/// 回答の種類のフラグ
		/// </summary>
		public NaGetTaskQueryResult SelectionFlag;
		
		public NaGetTaskQueryArgs(string message, NaGetTaskQueryResult selectionFlag)
		{
			this.Message = message;
			this.SelectionFlag = selectionFlag;
		}
	}
	
	/// <summary>
	/// 質問の答え
	/// </summary>
	[Flags()]
	public enum NaGetTaskQueryResult : uint
	{
		/// <summary>
		/// 継続(=OK)
		/// </summary>
		CONTINUE = 0x01,
		/// <summary>
		/// 再試行
		/// </summary>
		RETRY = 0x02,
		/// <summary>
		/// キャンセル、中止
		/// </summary>
		CANCEL = 0x04,
		/// <summary>
		/// 自動的なキャンセル(ユーザの手ではないもの)
		/// </summary>
		CANCELED_AUTOMATICALLY = 0x00,
	}
	
	
	#endregion
	
	/// <summary>
	/// NaGetタスク処理のパック
	/// </summary>
	public abstract class NaGetTaskSet : NaGetTask
	{
		/// <summary>
		/// タスク処理のイベントハンドラ
		/// </summary>
		public event EventHandler<NaGetTaskSetEventArgs> TaskSetRaised;
		
		/// <summary>
		/// タスク処理中の質問のハンドラ
		/// </summary>
		public event NaGetTaskQueryHandler TaskQueryRaised;
		
		/// <summary>
		/// 文字列で表現した作業一覧リスト
		/// </summary>
		public string[] TaskSetNames;
		
		/// <summary>
		/// 現在実行中の作業番号
		/// </summary>
		public abstract int CurrentTaskSetIndex {
			get;
		}
		
		protected virtual void RaiseTaskSetEvent(NaGetTaskSetEventType type, string message)
		{
			float percent = (CurrentTaskSetIndex >= 0)? CurrentTaskSetIndex * 100 / TaskSetNames.Length : -1;
			RaiseTaskSetEvent(type, message, percent);
		}
		
		protected virtual void RaiseTaskSetEvent(NaGetTaskSetEventType type, string message, float percent)
		{
			if (TaskSetRaised != null) {
				TaskSetRaised(this, new NaGetTaskSetEventArgs(type, message, percent));
			}
		}
		
		protected virtual void ReceivedErrorData(object sender, NaGet.Utils.AnyDataEventArgs<string> e)
		{
			if (! string.IsNullOrEmpty(e.Data)) {
				RaiseTaskSetEvent(NaGetTaskSetEventType.WARNING, e.Data);
			}
		}
		
		protected virtual void ReceivedOutputData(object sender, NaGet.Utils.AnyDataEventArgs<string> e)
		{
			if (! string.IsNullOrEmpty(e.Data)) {
				RaiseTaskSetEvent(NaGetTaskSetEventType.INFO, e.Data);
			}
		}
		
		protected virtual NaGetTaskQueryResult RaiseTaskSetQueryEvent(string message, NaGetTaskQueryResult selection)
		{
			if (TaskQueryRaised != null) {
				return TaskQueryRaised(this, new NaGetTaskQueryArgs(message, selection));
			}
			return NaGetTaskQueryResult.CANCELED_AUTOMATICALLY;
		}
		
		public override bool Running {
			get { return CurrentTaskSetIndex >= 0 && !Done; }
		}
	}
}