#requires -Version 5.1

$ErrorActionPreference = "Stop"

$ProjectRoot = Split-Path -Parent $PSScriptRoot
$RootPath = Join-Path $ProjectRoot "downloads"
$Separator = " - "

try {
    $Host.UI.RawUI.WindowTitle = "Группировка альбомов по исполнителям"
}
catch {
}

function Wait-BeforeExit {
    Write-Host ""
    [void](Read-Host "Нажмите Enter для выхода")
}

Clear-Host

Write-Host "Группировка альбомов по исполнителям" -ForegroundColor Cyan
Write-Host "Папка: $RootPath"
Write-Host ""

if (-not (Test-Path -LiteralPath $RootPath -PathType Container)) {
    New-Item -ItemType Directory -Path $RootPath -Force | Out-Null
}

$AlbumFolders = Get-ChildItem -LiteralPath $RootPath -Directory |
    Where-Object {
        $_.Name.Contains($Separator)
    } |
    ForEach-Object {
        $Artist = ($_.Name -split [regex]::Escape($Separator), 2)[0].Trim()

        [PSCustomObject]@{
            Artist = $Artist
            Folder = $_
        }
    }

$ArtistGroups = $AlbumFolders | Group-Object -Property Artist

$Moved = 0
$Skipped = 0

foreach ($Group in $ArtistGroups) {
    # Папка исполнителя создаётся только при наличии двух и более альбомов.
    if ($Group.Count -lt 2) {
        continue
    }

    $ArtistName = $Group.Name
    $ArtistPath = Join-Path -Path $RootPath -ChildPath $ArtistName

    if (-not (Test-Path -LiteralPath $ArtistPath -PathType Container)) {
        New-Item -Path $ArtistPath -ItemType Directory | Out-Null
        Write-Host "Создана папка: $ArtistName" -ForegroundColor Green
    }

    foreach ($Album in $Group.Group) {
        $SourcePath = $Album.Folder.FullName
        $DestinationPath = Join-Path -Path $ArtistPath -ChildPath $Album.Folder.Name

        if (Test-Path -LiteralPath $DestinationPath) {
            Write-Warning "Папка уже существует, пропущено: $DestinationPath"
            $Skipped++
            continue
        }

        try {
            Move-Item `
                -LiteralPath $SourcePath `
                -Destination $ArtistPath `
                -ErrorAction Stop

            Write-Host "Перемещено: $($Album.Folder.Name) -> $ArtistName" -ForegroundColor Cyan
            $Moved++
        }
        catch {
            Write-Warning "Не удалось переместить '$SourcePath': $($_.Exception.Message)"
            $Skipped++
        }
    }
}

Write-Host ""
Write-Host "Обработка завершена." -ForegroundColor Yellow
Write-Host "Перемещено: $Moved"
Write-Host "Пропущено:  $Skipped"

Wait-BeforeExit