<#*,:&cls
@echo off
pushd "%~dp0"
powershell -NoProfile -ExecutionPolicy RemoteSigned -Command ". ([ScriptBlock]::Create((Get-Content -LiteralPath \"%~0\" -ReadCount 0 | Out-String ))) "
popd
exit /b
#>

function GenSrt {
  param(
    [string]$Source,
    [string]$Output,
    [timespan]$EndTimeDiff = ([timespan]::FromMilliseconds(150)),
    [timespan]$StartTimeDiff = ([timespan]::FromMilliseconds(-500)),
    [timespan]$MinDiff = ([timespan]::FromMilliseconds(1000))
  )
  $re = New-Object System.Text.RegularExpressions.Regex -ArgumentList @("(\d{2}:\d{2}:\d{2},\d{3}) --> (\d{2}:\d{2}:\d{2},\d{3})", [System.Text.RegularExpressions.RegexOptions]::Compiled)
  # $re = [regex]"(\d{2}:\d{2}:\d{2},\d{3}) --> (\d{2}:\d{2}:\d{2},\d{3})"
  $format = "hh\:mm\:ss\,fff"
  $timelineformat = "{0:$format} --> {1:$format}"
  Get-Content -Path $Source -Encoding utf8 | ForEach-Object -Begin {
    $lineCtr = 0
    $section = @([timespan]::Zero.Add($EndTimeDiff), $null)
    $sectionIndex = 1
  } -Process {
    if ($lineCtr -eq 1) {
      $match = $re.Match($_)
      if ($match.Success) {
        $section[1] = [timespan]::ParseExact($match.Groups[1].Value, $format, $null).Add($StartTimeDiff)
        if ($section[1].Subtract($section[0]).Duration() -ge $MinDiff ) {
          $sectionIndex
          $timelineformat -f $section
          ""
          ""
          $sectionIndex++
        }
        # $timelineformat -f $section | Write-Host -ForegroundColor Green
        $section[0] = [timespan]::ParseExact($match.Groups[2].Value, $format, $null).Add($EndTimeDiff)
      }
    }
    if ($lineCtr -ge 3) {
      $lineCtr = 0
    } else {
      $lineCtr++
    }
  } | Set-Content -Path $Output -Encoding utf8
}

# [System.IO.Directory]::CreateDirectory($dstdir) | Out-Null
Get-ChildItem -Path "*.srt" -Filter "*.srt" -Exclude "*-副本.srt" | ForEach-Object {
  if (-not $_.PSIsContainer) {
    $dstfile = $_.BaseName + "-副本.srt"
    Write-Host "$($_.Name) --> $dstfile"
    GenSrt -Source $_ -Output $dstfile
  }
}
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@if(0)==(0) echo off
dir /b *.srt | findstr /i /v /e "\-副本.srt" | cscript //nologo //e:jscript "%~f0"
pause & exit
@end

var fso = new ActiveXObject('Scripting.FileSystemObject');

while (!WSH.StdIn.AtEndOfStream){
    var srcFile = WSH.StdIn.ReadLine();
    var objFile = fso.OpenTextFile(srcFile, 1);

    var out = [];
    var i = 0;
    var eTime = '00:00:00,000';

    while (!objFile.AtEndOfStream){
        var s = objFile.ReadLine();
        var m = s.match(/^(\d\d:\d\d:\d\d,\d\d\d) --> (\d\d:\d\d:\d\d,\d\d\d)$/);
        if (!m) continue;
        var t1 = getTotalMillisecond(eTime, 150);
        var t2 = getTotalMillisecond(m[1], -500);
        if ( t2 - t1 > 1000 ) {
            var s1 = formatTime(t1);
            var s2 = formatTime(t2);
            out.push( ++i + '\r\n' + s1 + ' --> ' + s2);
        }
        eTime = m[2];
    }

    var dstFile = srcFile.replace(/\.srt$/i, '-副本$&');
    fso.OpenTextFile(dstFile, 2, true).WriteLine( out.join('\r\n\r\n') );
}

function getTotalMillisecond(t, x){
    var arr = t.split(/[:,]/);
    return ( 3600 * arr[0] + 60 * arr[1] + 1 * arr[2] ) * 1000 + 1 * arr[3] + x;
}
    
function formatTime(t){
    var ms =  10 * ( t % 1000 / 10 ).toFixed() + 1000;
    t = Math.floor( t / 1000 );
    var HH = Math.floor( t / 3600 ) + 100;
    var mm = Math.floor( t % 3600 / 60 ) + 100;
    var ss =  t % 60 + 100;
    HH = ( '' + HH ).substr(1);
    mm = ( '' + mm ).substr(1);
    ss = ( '' + ss ).substr(1);
    ms = ( '' + ms ).substr(1);
    return HH + ':' + mm + ':' + ss + ',' + ms;
}
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