[CmdletBinding()]
Param(
  [Parameter(Mandatory=$True)]
   [string]$client,
   [Parameter(Mandatory=$True)]
   [string]$emDashEnvironment,
   [Parameter(Mandatory=$True)]
   [string]$buildNumber
)

function ValidateCredentials($credential, $errorMessage)
{
    if (-Not($credential.UserName -and $credential.Password.Length -ne 0))
    {
        Write-Error $errorMessage
        Exit
    }
}
function Get-RemoteFile ($url,$Target,$username,$password, $sourceFile) 
{ 
    $authInfo = $username + ":" + $password
    $authInfo = [System.Convert]::ToBase64String([System.Text.Encoding]::Default.GetBytes($authInfo))

    $webRequest = [System.Net.WebRequest]::Create($url)
    $webRequest.Headers["Authorization"] = "Basic " + $authInfo
    $webRequest.PreAuthenticate = $true
    $webRequest.Timeout = 600000

    try {
       $resp = $webRequest.GetResponse()
     } catch [System.Net.WebException] {
       $resp = $_.Exception.Response
     }

    if ($resp.StatusCode -ne 'OK')
    {
        Write-Error "ERROR - Unable to get Team City artefact at URL $url"
        exit 1
    }

    # get a download stream from the server response 
    $responsestream = $resp.GetResponseStream() 

    # create the target file on the local system and the download buffer 
    $targetfile = New-Object IO.FileStream ($Target,[IO.FileMode]::Create) 
    [byte[]]$readbuffer = New-Object byte[] 1024 

    # loop through the download stream and send the data to the target file 
    do{ 
        $readlength = $responsestream.Read($readbuffer,0,1024) 
        $targetfile.Write($readbuffer,0,$readlength) 
    } 
    while ($readlength -ne 0) 

    $targetfile.close() 
    $destinationFolder = $sourceFile -replace '.zip',''
       $destination = 'c:\emdash\installer'
       [io.compression.zipfile]::ExtractToDirectory($Target, $destination)
} 

function Get-EmdashDatabaseAndServer ($username,$password,$client,$environment) 
{ 
	$authInfo = $username + ":" + $password
    $authInfo = [System.Convert]::ToBase64String([System.Text.Encoding]::Default.GetBytes($authInfo))

	$headers = New-Object "System.Collections.Generic.Dictionary[[String],[String]]"
	$authHeader = "Basic " + $authInfo
	$headers.Add("Authorization", $authHeader)

    $url = "https://downloads.emdashsoftware.com/LicenceManager/api/Environment?client=" + $client + "&emDashEnvironment=" + $environment

	$response = Invoke-RestMethod $url -Headers $headers

	Return $response
} 

$teamCityUser="emdash\emdash"
$teamCityPassword="D0wnLoads!"



$appPoolCredentials = $host.ui.PromptForCredential("Service account credentials", "Please enter emDash service account username and password.", "", "")
ValidateCredentials($appPoolCredentials,"emDash service account credentials must be entered.")
$appPoolPassword = [Runtime.InteropServices.Marshal]::PtrToStringAuto([Runtime.InteropServices.Marshal]::SecureStringToBSTR($appPoolCredentials.Password))

Add-Type -assembly "system.io.compression.filesystem"

$sourceFileUrl = "https://downloads.emdashsoftware.com/LicenceManager/api/Artefact?buildNumber=" + $buildNumber + "&artefactName=Build"
$sourceFile = "Build.zip"

# Create the installer directory
If (Test-Path 'c:\emdash\installer'){
       Remove-Item 'c:\emdash\installer\*' -recurse
}
Else {
New-Item 'c:\emdash\installer' -type directory
}

$targetFilePath = 'c:\emdash\installer\' + $sourceFile
Get-RemoteFile $sourceFileUrl $targetFilePath $teamCityUser $teamCityPassword $sourceFile 'c:\emdash\installer'

$command  = 'c:\emdash\installer\emDash.Build.exe'

# Update the connection string for build.exe
$emdashDatabaseAndServer = Get-EmdashDatabaseAndServer $teamCityUser $teamCityPassword $client $emDashEnvironment
$database = $emdashDatabaseAndServer.EmdashDatabaseName
$server = $emdashDatabaseAndServer.EmdashDatabaseServer
$argList = "$database $server"
Invoke-Expression  "c:\emdash\installer\scripts\workflows\UpdateBuildExeConfigFile.ps1 $argList"
# Updated the build exe connection strings

$AllArgs = @('EMDASHDEPLOY',$client , $emDashEnvironment, $teamCityUser, $teamCityPassword, $buildNumber, $appPoolCredentials.UserName, $appPoolPassword, $appPoolCredentials.UserName, $appPoolPassword, $database,$server)

Write-Host "Starting Deploy emDash."
& $command $AllArgs
Write-Host "Completed Deploy emDash."