param (
    [string]$user,
    [string]$pass,
    [string]$server,
    [string]$db,
    [string]$newdb
)

$env:PSModulePath = $env:PSModulePath + ";C:\Program Files (x86)\Microsoft SQL Server\130\Tools\PowerShell\Modules\SQLPS"

Function Get-DBConnection($username, $password, $server, $database) {
    $connection = New-Object Microsoft.SqlServer.Management.Common.ServerConnection
    $connection.LoginSecure = $False
    $connection.Login = $username
    $connection.Password = $password
    $connection.DatabaseName = $database
    $connection.ServerInstance = $server
    return $connection
}

Function Copy-Database($username, $password, $server, $sourcedatabase, $targetdatabase) {
    $connection = Get-DBConnection -Username $username -Password $password -Server $server -Database $sourcedatabase

    $srv = New-Object Microsoft.SqlServer.Management.Smo.Server($connection)
    $srv.Databases | ?{ $_.Name -eq $sourcedatabase } | %{
        $error.clear()
        $transfer = New-Object Microsoft.SqlServer.Management.Smo.Transfer($_)
        $transfer.DestinationDatabase = $targetdatabase
        $transfer.DestinationLoginSecure = $False
        $transfer.DestinationServer = $server
        $transfer.DestinationLogin = $username
        $transfer.DestinationPassword = $password
        $transfer.CopyAllDatabaseTriggers = $True
        $transfer.CopyAllDefaults = $True
        $transfer.CopyAllFullTextCatalogs = $True
        $transfer.CopyAllUsers = $False
        $transfer.CopyAllLogins = $False
        $transfer.CopyAllObjects = $False
        $transfer.CopyAllSchemas = $True
        $transfer.CopyAllStoredProcedures = $True
        $transfer.CopyAllTables = $True
        $transfer.CopyAllUserDefinedFunctions = $True
        $transfer.CopyAllUserDefinedTableTypes = $True
        $transfer.CopyAllUserDefinedTypes = $True
        $transfer.CopyAllUserDefinedDataTypes = $True
        $transfer.CopyAllViews = $True
        $transfer.CopyData = $True
        $transfer.CopySchema = $True
        $transfer.DropDestinationObjectsFirst = $True
        $transfer.CreateTargetDatabase = $False
        $transfer.Options.WithDependencies = $true
        $transfer.Options.ContinueScriptingOnError = $true
        $transfer.Options.IncludeHeaders = $True
        $transfer.Options.DriAll = $True
        $transfer.Options.Triggers = $True

        Try {
            $transfer.TransferData()
        } Catch {
            $error | select *
        }
    }
}

Function Fix-ASPState($username, $password, $server, $olddatabase, $newdatabase) {
    $connection = Get-DBConnection -Username $username -Password $password -Server $server -Database $newdatabase
    $srv = New-Object Microsoft.SqlServer.Management.Smo.Server($connection)
    $srv.Databases | ?{ $_.Name -eq $newdatabase } | %{
        $_.StoredProcedures | ?{ $_.Schema -eq "dbo" } | %{
            $search = "\[$olddatabase\]"
            $replace = "[$newdatabase]"
            $_.TextBody = ($_.TextBody -Replace $search, $replace)
            $_.Alter()
        }
    }
}

Function Database-Exists($username, $password, $server, $database) {
    $result = Invoke-Sqlcmd -Query  "SELECT count(*) FROM master.dbo.sysdatabases WHERE name = '$database'" `
        -ServerInstance $server  -Database 'master' -Username $user -Password $password
    return [bool]$result.Column1
}

Function Create-Database($username, $password, $server, $database) {
    $query = "CREATE DATABASE [$database] CONTAINMENT = NONE ON PRIMARY " + `
        "( NAME = N'$database', FILENAME = N'D:\RDSDBDATA\DATA\$database.mdf' , SIZE = 5120KB , FILEGROWTH = 10%) " + `
        "LOG ON " + `
        "( NAME = N'$($database)_log', FILENAME = N'D:\RDSDBDATA\DATA\$($database)_log.ldf' , SIZE = 1024KB , FILEGROWTH = 10%)"
    Invoke-Sqlcmd -Query $query -ServerInstance $server -Database 'master' `
        -Username $user -Password $password
    return (Database-Exists -Username $username -Password $password -Server $server -Database $database)
}

if (! (Database-Exists -Username $user -Password $pass -Server $server -Database $newdb)) {
    Create-Database -Username $user -Password $pass -Server $server -Database $newdb | Out-Null
    Copy-Database -Username $user -Password $pass -Server $server -SourceDatabase $db -TargetDatabase $newdb
    if ($newdb -like "*ASPState*") {
        Fix-ASPState -Username $user -Password $pass -Server $server -OldDatabase $db -NewDatabase $newdb
    }
}