Function ConfigureUmbraco {
    Param([string]$url, [string]$username, [string]$email, [string]$password, [string]$databaseType, [string]$sqlServer, [string]$databaseName, [bool]$sqlUseIntegratedAuthentication, [string]$sqlUsername, [string]$sqlPassword)

    try { $response = Invoke-WebRequest $("{0}/install/api/GetSetup" -f $url) -SessionVariable 'session' -Method GET }
    catch { $response = $null }

    if ($null -ne $response) {
        $responseData = ParseResponse($response);

        $installId = $responseData.installId;
        $isUpgrade = $responseData.steps[0].name -eq "Upgrade";

        if ($isUpgrade -eq $false) {
            $data = @{
                installId    = $installId
                instructions = @{
                    User                = @{
                        name                  = $username
                        email                 = $email
                        password              = $password
                        subscribeToNewsLetter = $false
                    }
                    DatabaseConfigure   = @{
                        dbType = [DatabaseType]::$databaseType
                    }
                    ConfigureMachineKey = $true
                    StarterKitDownload  = "00000000-0000-0000-0000-000000000000"
                }
            }

            if ([DatabaseType]::$databaseType -ne [DatabaseType]::SqlCe) {
                $data.instructions.DatabaseConfigure.server = $sqlServer;
                $data.instructions.DatabaseConfigure.databaseName = $databaseName;

                if ($sqlUseIntegratedAuthentication) {
                    $data.instructions.DatabaseConfigure.integratedAuth = $true;
                }
                else {
                    $data.instructions.DatabaseConfigure.login = $sqlUsername;
                    $data.instructions.DatabaseConfigure.password = $sqlPassword;
                }
            }

            if ((StartUmbracoProcess $("{0}/install/api/PostPerformInstall" -f $url) $data $session) -eq $false) {
                Error "An error occured during Umbraco configuration"
            }
        }
        else {
            $model = ParseResponse($response).steps[0].model;

            $data = @{
                username = $email
                password = $password
            };

            try { $response = Invoke-WebRequest $("{0}/umbraco/backoffice/UmbracoApi/Authentication/PostLogin" -f $url) -WebSession $session -Method POST -Body ($data | ConvertTo-Json -Depth 5) -ContentType "application/json" }
            catch { $response = $null}

            if ($null -ne $response) {
                $data = @{
                    installId    = $installId
                    instructions = @{
                        Upgrade = $model
                    }
                }

                if ((StartUmbracoProcess $("{0}/install/api/PostPerformInstall" -f $url) $data $session) -eq $false) {
                    Error "An error occured during Umbraco configuration"
                }
            }
            else {
                Error "The authentication to Umbraco back office failed";
            }
        }

        Success
    }
    else {
        Warning "No configuration needed"
    }
}

Function StartUmbracoProcess {
    Param([string]$url, [Hashtable]$data, [Microsoft.PowerShell.Commands.WebRequestSession]$session)

    $continue = $true;

    do {
        try {
            $response = Invoke-WebRequest $url -WebSession $session -Method POST -Body ($data | ConvertTo-Json -Depth 5) -ContentType "application/json; charset=utf-8"
            $continue = !(ParseResponse($response)).complete;
        }
        catch {
            return $false
        }
    } while ($continue -eq $true);

    return $true
}