$tenantId = "00000000-0000-0000-0000-000000000000"
$clientID = "00000000-0000-0000-0000-000000000000"
$clientSecret = (ConvertTo-SecureString "CLIENT_SECRET_VALUE" -AsPlainText -Force )
$Scope = "https://graph.microsoft.com/.default"
$authToken = Get-MsalToken -ClientId $clientID -ClientSecret $clientSecret -TenantId $tenantId -Scopes $Scope

$TeamsTeam = Read-Host "Enter team name"

$Headers = @{
    "Authorization" = "Bearer $($authToken.AccessToken)"
    "Content-type"  = "application/json"
}

$allTeams = @()
$aadTeams = (Invoke-RestMethod -Uri "https://graph.microsoft.com/v1.0/teams/" -Headers $Headers -Method Get -ContentType "application/json")
$allTeams += $aadTeams.value
if ($aadTeams.'@odata.nextLink') {
    do {
        $aadTeams = (Invoke-RestMethod -Uri $aadTeams.'@odata.nextLink' -Headers $Headers -Method Get -ContentType "application/json")
        $allTeams += $aadTeams.value
    } until (!$aadTeams.'@odata.nextLink')
}
$aadTeams = $allTeams

$channels = [System.Collections.ArrayList]::New()

foreach ($teams in $aadTeams) {
    if ($teams.displayName -like "$($TeamsTeam)*") {
        $apiUri = "https://graph.microsoft.com/v1.0/teams/$($teams.id)/channels"
        $Team = Invoke-RestMethod -Headers $Headers -Uri $apiUri -Method GET
        $channelList = $Team.Value
        foreach ($channel in $channelList) {
            $channelFolder = Invoke-RestMethod -Headers $Headers -Uri "https://graph.microsoft.com/v1.0/teams/$($teams.id)/channels/$($channel.id)/filesFolder" -Method GET
            $DriveID = $channelFolder.parentReference.driveId
            $displayName = $channelFolder.name -replace " ", "_" -replace ",", ""
            $Result = [PSCustomObject]@{
                displayName    = $displayName
                driveID        = $DriveID
                membershipType = $channel.membershipType
                teamName       = $teams.displayName
            }
            [void]$channels.Add($Result)
        }
    }    
}

$uniqueDrives = $channels | Sort-Object -Property driveID -Unique | Select-Object displayName, driveID, membershipType, teamName
$uniqueDrives | ForEach-Object { if ($_.membershipType -eq 'standard') { $_.displayName = $_.teamName -replace " ", "_" } }
foreach ($drive in $uniqueDrives) {
    $config = Get-Content -Path ./remote-template.conf -Raw
    $remote = $config -f $drive.displayName, $drive.driveID
    Add-Content -Value $remote -Path ./rclone.conf
}

$teamNames = $($uniqueDrives.displayName -join [Environment]::NewLine) -replace "\n", ": "
$teamNames = $teamNames + ":"
$union = Get-Content -Path ./union-template.conf -Raw
$unionConf = $union -f "$($channels[0].teamName)_union", $teamNames
Add-Content -Value $unionConf -Path ./rclone.conf