param (
[string]$ScriptFolder = "C:\Database\Updates",
[string]$Version = "2.11.0.0",
[string]$SendEmailsTo = "test@test.com",
[boolean]$GetAllChanges = 0
)

#sends notification emails
 Function SendEmail($SendEmailsTo_, $EmailSubject_, $changes_)
 {
   $emailFrom = "teamcity@test.com" 
   $smtpserver="smtp.test.com" 
   $smtp=new-object Net.Mail.SmtpClient($smtpServer) 

   foreach ($email in $SendEmailsTo_.split(';'))
   {   
      $smtp.Send($emailFrom, $email, $EmailSubject_, $changes_)
   }
 }

 #get file by version number
 Function GetReleaseFileName($Version_)
 {
    $VersionFilename_ ="v";
     $Version_.split('.') | ForEach-Object{
        $VersionFilename_ +=  [System.Convert]::ToDouble($_).ToString("00"); 
    }
    $VersionFilename_ += ".sql";

     #format e.g. v12.12.00.10.sql
    return $VersionFilename_;
 }

#return if no emails added
if($SendEmailsTo.trim() -eq "") { "no emails defined!"; return;}

$VersionFilename =  GetReleaseFileName $Version;

$EmailSubject = "Release $Version database changes";
$changes = "Changes in release file $VersionFilename `r`n `r`n";
$hasChanges = 0;

if(!$GetAllChanges) {  
    (dir $ScriptFolder) | sort CreationTime -Descending |
     ForEach-Object {  
        $fileContent = get-content ($_.Directory.FullName + "\" + $VersionFilename) -Raw;

        $patterns = 'alter','drop','insert','delete','update','create'; #paterns/strings to find
        $hasChanges = 0;
        foreach ($pattern in $patterns)
        {
           $fileContent.split("`r`n") | ?  { $_ -match $pattern } | % { $changes += $_.trim() + "`r`n"; $hasChanges = 1; } 
        } 

        if($hasChanges -eq 0) { $changes += "`r`nNo database changes for release $Version !"}

        write-output $changes

        SendEmail $SendEmailsTo $EmailSubject $changes;

        break;        
    }
}
else
{
  #parse all files for all previous releases
  $EmailSubject = "All database changes";
  $changes = "All database changes: `r`n `r`n";

  (dir $ScriptFolder) | sort CreationTime -Descending |
    ForEach-Object {  
        $fileContent = get-content ($_.Directory.FullName + "\" + $_.name) -Raw;

        $patterns = 'alter','drop','insert','delete','update','create';
        $changes += "`r`nChanges in release file $_`r`n";
        $hasChanges = 0;

        foreach ($pattern in $patterns)
        {          
           if($fileContent)
           {
              $fileContent.split("`r`n") | ?  { $_ -match $pattern } | % { $changes += $_.trim() + "`r`n"; $hasChanges = 1; }  
           } 
        } 

        if($hasChanges -eq 0) { $changes += "`r`nNo database changes for release " + $_.name.Replace(".sql","").Replace("v0","");}

        $changes += "`r`n-------------------------------`r`n";      
    }

    write-output $changes 

    SendEmail $SendEmailsTo $EmailSubject $changes;
}