param([string]$buildNumber="NotSet", [string]$buildId="NotSet", [string]$branch="NotSet", [string]$buildName="NoSet", [string]$buildBy="NoSet")

# PRINT PASSED VARS
#=======================================================================
Write-Host "Triggering Slack Build Notification...";
Write-Host " - Build Number: $buildNumber";
Write-Host " - Build Id: $buildId";
Write-Host " - Build Name: $buildName";
Write-Host " - Branch: $branch";
Write-Host " - By: $buildBy";

# VARIABLES
#=======================================================================
$urlString = 'https://hooks.slack.com/services/XXXXXXXXXXXXXXXXXXXX/XXXXXXXXXXXXXXXXXXXXX';
$channel = '#SLACKCHANNELNAME';
$userName = 'TFSBUILD';
$userImage = 'http://i.imgur.com/23ycZ8A.png';

# DEFINE FIELD ARRY
#=======================================================================
[Array] $fields = @(
    @{ title="Build Definition"; value=$buildName; short='false'; }
    @{ title="Branch"; value=$branch; short='false'; }
    @{ title="Requested by"; value=$buildBy; short='false'; }
)

# CREATE BODY
#=======================================================================
$postParams = @{
    channel = $channel
    username = $userName
    icon_url = $userImage;
    as_user = 'false'
    text = 'Build <http://rddevtfs1:8080/tfs/DefaultCollection/HiFx/_build#_a=summary&buildId=' + $buildId + '|Build ' + $buildNumber + '> started';
    attachments = @(
        @{
            color = "#e3e4e6";
            fields = $fields;
        };
    );
}

$json = $postParams | ConvertTo-Json -Depth 4
$json = [regex]::replace($json,'\\u[a-fA-F0-9]{4}',{[char]::ConvertFromUtf32(($args[0].Value -replace '\\u','0x'))})
$json = $json -replace "\\\\", "\"

# EXECUTE
#=======================================================================
Invoke-WebRequest -Uri $urlString -Method POST -Body $json