using System;
using System.Diagnostics;
using System.IO;
using System.Threading.Tasks;

namespace BetterEN5.Services
{
    public class ConversionService : IConversionService
    {
        public async Task<string> ConvertPptxToEnbxAsync(string pptxPath)
        {
            if (!File.Exists(pptxPath))
                throw new FileNotFoundException("PPT 文件未找到", pptxPath);

            var outputPath = Path.ChangeExtension(pptxPath, ".enbx");

            var converterProcess = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86),
                "Seewo", "EasiNote5", "EasiNote5_5.2.4.9855", "Main",
                "EasiNote.OfficeDocumentConverter.exe");

            if (File.Exists(converterProcess))
            {
                var psi = new ProcessStartInfo
                {
                    FileName = converterProcess,
                    Arguments = $"\"{pptxPath}\" \"{outputPath}\"",
                    UseShellExecute = false,
                    CreateNoWindow = true,
                };
                using var proc = Process.Start(psi);
                if (proc != null)
                {
                    await proc.WaitForExitAsync();
                }
            }
            else
            {
                throw new FileNotFoundException("转换器未找到，请确认希沃白板安装完整", converterProcess);
            }

            return outputPath;
        }

        public async Task<string> ConvertEnbxToPptxAsync(string enbxPath)
        {
            if (!File.Exists(enbxPath))
                throw new FileNotFoundException("ENBX 文件未找到", enbxPath);

            var outputPath = Path.ChangeExtension(enbxPath, ".pptx");

            var exporterProcess = Path.Combine(
                Environment.GetFolderPath(Environment.SpecialFolder.ProgramFilesX86),
                "Seewo", "EasiNote5", "EasiNote5_5.2.4.9855", "Main",
                "EasiNote.OfficeDocumentConverter.exe");

            if (File.Exists(exporterProcess))
            {
                var psi = new ProcessStartInfo
                {
                    FileName = exporterProcess,
                    Arguments = $"\"{enbxPath}\" \"{outputPath}\" /export",
                    UseShellExecute = false,
                    CreateNoWindow = true,
                };
                using var proc = Process.Start(psi);
                if (proc != null)
                {
                    await proc.WaitForExitAsync();
                }
            }
            else
            {
                throw new FileNotFoundException("转换器未找到，请确认希沃白板安装完整", exporterProcess);
            }

            return outputPath;
        }

        public async Task FixConversionErrorsAsync()
        {
            await Task.Run(() =>
            {
                var en5Path = Path.Combine(
                    Environment.GetFolderPath(Environment.SpecialFolder.LocalApplicationData),
                    "Seewo", "EasiNote5");

                if (Directory.Exists(en5Path))
                {
                    var tempDir = Path.Combine(en5Path, "Temp", "Conversion");
                    if (Directory.Exists(tempDir))
                    {
                        try { Directory.Delete(tempDir, true); } catch { }
                    }
                }
            });
        }
    }
}