using System;
using System.ComponentModel;
using System.Diagnostics;

namespace Funique
{
    /// <summary>
    /// Use seperate process to access third party application <br />
    /// ------------------------------------------------ <br />
    /// 使用額外的執行序還存取第三方執行檔
    /// </summary>
    public abstract class ThirdPartyApplication : IDisposable
    {
        protected Process MainProcess;
        protected BackgroundWorker BackgroundWorker;
        /// <summary>
        /// Default progress react is not enable <br />
        /// But if enable this value will reflect current background worker's progress <br />
        /// ------------------------------------------------ <br />
        /// 預設進度條: 關閉 <br />
        /// 如果打開, 這個數字會顯示目前執行的進度背景作業的
        /// </summary>
        protected int progress = -1;
        /// <summary>
        /// Effect debug message tag <br />
        /// ------------------------------------------------ <br />
        /// 影響 Debug 資訊輸出的標籤
        /// </summary>
        protected virtual string WorkerName => "Unknown";

        public ThirdPartyApplication()
        {
            FuniqueLogger.Log($"{WorkerName} initialization", WorkerName);
            MainProcess = new Process();
            BackgroundWorker = new BackgroundWorker();
            BackgroundWorker.WorkerSupportsCancellation = true;
            BackgroundWorker.DoWork += DoWork;
            BackgroundWorker.RunWorkerCompleted += Completed;
            BackgroundWorker.ProgressChanged += ProgressChanged;
        }

        /// <summary>
        /// Run background worker <br />
        /// ------------------------------------------------ <br />
        /// 執行背景工作序
        /// </summary>
        public void Run()
        {
            FuniqueLogger.Log($"{WorkerName} start running", WorkerName);
            BackgroundWorker.RunWorkerAsync();
        }

        /// <summary>
        /// Background worker progress update event <br />
        /// ------------------------------------------------ <br />
        /// 背景工作序進度更新事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected virtual void ProgressChanged(object sender, ProgressChangedEventArgs e)
        {
            progress = e.ProgressPercentage;
        }
        /// <summary>
        /// Background do worker event <br />
        /// Default, this will activate main process <br />
        /// ------------------------------------------------ <br />
        /// 背景工作序 執行事件 <br />
        /// 預設, 這個會執行副執行序註冊的事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected virtual void DoWork(object sender, DoWorkEventArgs e)
        {
            BackgroundWorker bw = sender as BackgroundWorker;
            Open(bw);
        }
        /// <summary>
        /// When background process finished <br />
        /// ------------------------------------------------ <br />
        /// 當背景執行序結束執行
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected virtual void Completed(object sender, RunWorkerCompletedEventArgs e)
        {
            FuniqueLogger.Log($"{WorkerName} finished running", WorkerName);
        }

        /// <summary>
        /// Main process pre-activate event <br />
        /// ------------------------------------------------ <br />
        /// 在開始執行副執行序註冊的事件前置序
        /// </summary>
        /// <param name="bw"></param>
        protected virtual void Open(BackgroundWorker bw)
        {
            MainProcess.Start();
        }
        /// <summary>
        /// Cancel the process running but resource will keep it <br />
        /// It can running again <br />
        /// ------------------------------------------------ <br />
        /// 取消執行序執行 但是會保留資源 <br />
        /// 可以再度啟動
        /// </summary>
        public virtual void Close()
        {
            MainProcess.Close();
            BackgroundWorker.CancelAsync();
            FuniqueLogger.Log("Process got cancel", WorkerName);
        }
        /// <summary>
        /// Kill the process and background process to release the memories <br />
        /// ------------------------------------------------ <br />
        /// 殺死執行序與背景作業來釋放資源
        /// </summary>
        public virtual void Dispose()
        {
            FuniqueLogger.Log($"{WorkerName} disposing", WorkerName);
            Close();
            BackgroundWorker.Dispose();
            FuniqueLogger.Log($"{WorkerName} process killed", WorkerName);
            MainProcess.Dispose();
        }
    }
}