using System;
using System.IO;
using AAXClean;
using AAXClean.Codecs;
using Dinah.Core.StepRunner;
using FileManager;

namespace AaxDecrypter
{
	public class AaxcDownloadSingleConverter : AaxcDownloadConvertBase
	{
		protected override StepSequence Steps { get; }

		public AaxcDownloadSingleConverter(string outFileName, string cacheDirectory, IDownloadOptions dlOptions)
			: base(outFileName, cacheDirectory, dlOptions)
		{
			Steps = new StepSequence
			{
				Name = "Download and Convert Aaxc To " + DownloadOptions.OutputFormat,

				["Step 1: Get Aaxc Metadata"] = Step_GetMetadata,
				["Step 2: Download Decrypted Audiobook"] = Step_DownloadAudiobookAsSingleFile,
				["Step 3: Create Cue"] = Step_CreateCue,
				["Step 4: Cleanup"] = Step_Cleanup,
			};
		}

		private bool Step_DownloadAudiobookAsSingleFile()
		{
			var zeroProgress = Step_DownloadAudiobook_Start();

			FileUtility.SaferDelete(OutputFileName);

			var outputFile = File.Open(OutputFileName, FileMode.OpenOrCreate, FileAccess.ReadWrite);
			OnFileCreated(OutputFileName);

			AaxFile.ConversionProgressUpdate += AaxFile_ConversionProgressUpdate;
			var decryptionResult
				= DownloadOptions.OutputFormat == OutputFormat.M4b
				? AaxFile.ConvertToMp4a(outputFile, DownloadOptions.ChapterInfo, DownloadOptions.TrimOutputToChapterLength)
				: AaxFile.ConvertToMp3(outputFile, DownloadOptions.LameConfig, DownloadOptions.ChapterInfo, DownloadOptions.TrimOutputToChapterLength);
			AaxFile.ConversionProgressUpdate -= AaxFile_ConversionProgressUpdate;

			DownloadOptions.ChapterInfo = AaxFile.Chapters;

			Step_DownloadAudiobook_End(zeroProgress);

			var success = decryptionResult == ConversionResult.NoErrorsDetected && !IsCanceled;
			if (success)
				base.OnFileCreated(OutputFileName);

			return success;
		}
	}
}