Goto.psm1

$script:GotoDataPath = Join-Path -Path $env:APPDATA -ChildPath 'PowerShell\Goto'
$script:AliasFilePath = Join-Path -Path $script:GotoDataPath -ChildPath "GotoAliases.ps1"
$script:BackupFilePath = Join-Path -Path $script:GotoDataPath -ChildPath "GotoAliases.bak"



$Global:DirectoryAliases = @{}

function Backup-Aliases {
    if (Test-Path $script:AliasFilePath) {
        Copy-Item -Path $script:AliasFilePath -Destination $script:BackupFilePath -Force
        Write-Host "Aliases backed up to $script:BackupFilePath" -ForegroundColor Green
    }
}

function Restore-AliasesFromBackup {
    if (Test-Path $script:BackupFilePath) {
        Copy-Item -Path $script:BackupFilePath -Destination $script:AliasFilePath -Force
        Write-Host "Aliases restored from backup." -ForegroundColor Green
        Import-Aliases
    }
    else {
        Write-Warning "No backup file found. Unable to restore aliases."
    }
}

function Update-GotoModule {
    try {
        Backup-Aliases

        $currentAliases = $Global:DirectoryAliases.Clone()

        $currentModule = Get-InstalledModule -Name Goto -ErrorAction Stop

        try {
            $onlineModule = Find-Module -Name Goto -ErrorAction Stop
            $newVersion = $onlineModule.Version
        }
        catch {
            Write-Host "Unable to check for updates using Find-Module. Using alternative method." -ForegroundColor Yellow
            $response = Invoke-RestMethod -Uri "https://www.powershellgallery.com/api/v2/Packages?`$filter=Id eq 'Goto' and IsLatestVersion" -ErrorAction Stop
            $newVersion = [version]($response.properties.Version)
        }

        if ($newVersion -gt $currentModule.Version) {
            Write-Host "Current Goto version: $($currentModule.Version)" -ForegroundColor Cyan
            Write-Host "New version available: $newVersion" -ForegroundColor Green

            Update-Module -Name Goto -Force -ErrorAction Stop

            $updatedModule = Get-InstalledModule -Name Goto
            Write-Host "Goto has been successfully updated to version $($updatedModule.Version)!" -ForegroundColor Green

            $Global:DirectoryAliases = $currentAliases
            Save-Aliases

            Write-Host "Aliases have been restored." -ForegroundColor Green

            Initialize-GotoEnvironment

            Write-Host "Please restart your PowerShell session to use the new version." -ForegroundColor Yellow
        }
        else {
            Write-Host "Goto is already at the latest version ($($currentModule.Version))." -ForegroundColor Green
        }
    }
    catch {
        Write-Host "An error occurred while updating Goto: $_" -ForegroundColor Red
        Write-Host "Error details: $($_.Exception.Message)" -ForegroundColor Red
        Write-Host "Stack trace: $($_.ScriptStackTrace)" -ForegroundColor Red

        Restore-AliasesFromBackup
    }
}

function Initialize-GotoEnvironment {
    if (-not (Test-Path -Path $script:GotoDataPath)) {
        New-Item -Path $script:GotoDataPath -ItemType Directory -Force | Out-Null
    }

    if (-not (Test-Path -Path $script:AliasFilePath)) {
        Save-Aliases
    }

    $profileContent = "Import-Module Goto -DisableNameChecking"

    if (-not (Test-Path -Path $PROFILE)) {
        New-Item -Path $PROFILE -ItemType File -Force | Out-Null
    }

    $currentProfileContent = Get-Content -Path $PROFILE -Raw -ErrorAction SilentlyContinue

    if ($currentProfileContent -notmatch [regex]::Escape($profileContent)) {
        Add-Content -Path $PROFILE -Value "`n$profileContent"
    }
}

function Invoke-VersionCheck {
    $installedModule = Get-InstalledModule -Name Goto -ErrorAction SilentlyContinue
    $onlineModule = Find-Module -Name Goto -ErrorAction SilentlyContinue

    if ($installedModule -and $onlineModule) {
        if ($onlineModule.Version -gt $installedModule.Version) {
            Write-Host "`nNew version $($onlineModule.Version) is available! Your version: $($installedModule.Version)" -ForegroundColor Cyan
            Write-Host "To update, run the following command:" -ForegroundColor Cyan
            Write-Host " goto update" -ForegroundColor Green
        }
    }
}

function Save-Aliases {
    try {
        $Global:DirectoryAliases | Export-Clixml -Path $script:AliasFilePath
        Write-Host "Aliases saved successfully." -ForegroundColor Green
    }
    catch {
        Write-Warning "Failed to save aliases. Error: $_"
    }
}

function Import-Aliases {
    if (Test-Path $script:AliasFilePath) {
        try {
            $aliasData = Import-Clixml -Path $script:AliasFilePath
            $Global:DirectoryAliases = $aliasData

            $Global:DirectoryAliases.GetEnumerator() | ForEach-Object {
                $alias = $_.Key
                $path = $_.Value
                Set-Alias -Name "cd$alias" -Value { Set-Location $path } -Scope Global
            }
        }
        catch {
            Write-Warning "Failed to load aliases from $script:AliasFilePath. Error: $_"
            $Global:DirectoryAliases = @{}
        }
    }
    else {
        $Global:DirectoryAliases = @{}
    }
}

function _goto_print_similar {
    param([string]$aliasInput)

    $normalizedInput = $aliasInput.ToLower()
    $matches = $Global:DirectoryAliases.Keys | Where-Object {
        $_ -like "*$normalizedInput*"
    }

    $matchedAliases = $matches | ForEach-Object {
        [PSCustomObject]@{
            Alias = $_
            Path  = $Global:DirectoryAliases[$_]
        }
    }

    if ($matchedAliases.Count -eq 1) {
        $selectedAlias = $matchedAliases[0].Alias
        $path = $matchedAliases[0].Path
        Write-Host "Navigating to '$selectedAlias' -> '$path'." -ForegroundColor Green
        return $selectedAlias
    }
    elseif ($matchedAliases.Count -gt 1) {
        Write-Host "Did you mean one of these? Type the number to navigate, or press ENTER to cancel:" -ForegroundColor Yellow
        for ($i = 0; $i -lt $matchedAliases.Count; $i++) {
            Write-Host "[$($i+1)]: $($matchedAliases[$i].Alias) -> $($matchedAliases[$i].Path)" -ForegroundColor Cyan
        }
        $choice = Read-Host "Enter your choice (1-$($matchedAliases.Count))"
        if ($choice -match '^\d+$' -and [int]$choice -ge 1 -and [int]$choice -le $matchedAliases.Count) {
            $selectedAlias = $matchedAliases[[int]$choice - 1].Alias
            $path = $matchedAliases[[int]$choice - 1].Path
            Write-Host "Navigating to '$selectedAlias' -> '$path'." -ForegroundColor Green
            return $selectedAlias
        }
    }
    return $null
}

function goto {
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true, Position = 0)]
        [string]$Command,

        [Parameter(Mandatory = $false, Position = 1)]
        [string]$Alias,

        [Parameter(Mandatory = $false, Position = 2)]
        [string]$Path
    )

    if ($Global:DirectoryAliases.ContainsKey($Command)) {
        $path = $Global:DirectoryAliases[$Command]
        Write-Host "Navigating to alias '$Command' at path '$path'."
        Set-Location $path
    }
    else {
        switch ($Command) {
            'update' {
                Update-GotoModule
            }
            'r' {
                if (-not [string]::IsNullOrWhiteSpace($Alias) -and -not [string]::IsNullOrWhiteSpace($Path)) {
                    if (Test-Path $Path) {
                        $resolvedPath = Resolve-Path -Path $Path | Select-Object -ExpandProperty Path
                        $Global:DirectoryAliases[$Alias] = $resolvedPath
                        Set-Alias -Name "cd$Alias" -Value { Set-Location $resolvedPath } -Scope Global
                        Write-Host "Alias '$Alias' registered for path '$resolvedPath'." -ForegroundColor Green
                        Save-Aliases
                    }
                    else {
                        Write-Warning "The specified path does not exist."
                    }
                }
                else {
                    Write-Warning "Alias name or path not specified. Usage: goto r <alias_name> <path>"
                }
            }
            'u' {
                if ($Global:DirectoryAliases.ContainsKey($Alias)) {
                    $aliasPath = $Global:DirectoryAliases[$Alias]
                    $confirmDeletion = Read-Host "Are you sure you want to unregister the alias '$Alias' which points to '$aliasPath'? [Y/N]"
                    if ($confirmDeletion -eq 'Y') {
                        $Global:DirectoryAliases.Remove($Alias)
                        Write-Host "`nAlias '$Alias' unregistered." -ForegroundColor Green
                        Save-Aliases
                    }
                    else {
                        Write-Host "`nAlias unregistration cancelled." -ForegroundColor Yellow
                    }
                }
                else {
                    Write-Warning "`nAlias '$Alias' does not exist." -ForegroundColor Yellow
                }
            }
            'l' {
                if ($Global:DirectoryAliases.Count -eq 0) {
                    Write-Host "`nNo aliases registered."
                }
                else {
                    $horizontalLine = ([char]0x2500).ToString() * 2
                    $maxAliasLength = ($Global:DirectoryAliases.Keys | Measure-Object -Maximum -Property Length).Maximum + 2
                    Write-Host ""
                    $Global:DirectoryAliases.GetEnumerator() | Sort-Object Name | ForEach-Object {
                        $aliasPadded = $_.Key.PadRight($maxAliasLength)
                        Write-Host " $aliasPadded" -ForegroundColor Green -NoNewline
                        Write-Host "$horizontalLine> " -NoNewline
                        Write-Host $_.Value -ForegroundColor Yellow
                    }
                }
            }
            'x' {
                if ($Global:DirectoryAliases.ContainsKey($Alias)) {
                    Write-Host "`n$Alias -> $($Global:DirectoryAliases[$Alias])" -ForegroundColor Green
                }
                else {
                    Write-Warning "`nAlias $Alias does not exist." -ForegroundColor Yellow
                }
            }
            'c' {
                $keysToRemove = $Global:DirectoryAliases.Keys | Where-Object {
                    $path = $Global:DirectoryAliases[$_]
                    -not [string]::IsNullOrWhiteSpace($path) -and -not (Test-Path $path)
                }

                if ($keysToRemove.Count -gt 0) {
                    foreach ($key in $keysToRemove) {
                        Write-Warning "`n Cleaning up alias '$key' because the path no longer exists." -ForegroundColor Yellow
                        $Global:DirectoryAliases.Remove($key)
                    }
                    Save-Aliases
                    Write-Host "`nCleanup complete. Removed aliases with non-existent paths." -ForegroundColor Green
                }
                else {
                    Write-Host "`nNo cleanup needed. All aliases point to valid paths." -ForegroundColor Yellow
                }
            }
            'p' {
                $currentPath = (Get-Location).Path
                Push-Location

                if ($Global:DirectoryAliases.ContainsKey($Alias)) {
                    $path = $Global:DirectoryAliases[$Alias]
                    Write-Host "Pushed current directory '$currentPath' to stack and moved to alias '$Alias' at path '$path'." -ForegroundColor Green
                    Set-Location $path
                }
                else {
                    if (-not [string]::IsNullOrWhiteSpace($Alias)) {
                        $selectedAlias = _goto_print_similar -aliasInput $Alias
                        if ($selectedAlias) {
                            $path = $Global:DirectoryAliases[$selectedAlias]
                            Write-Host "Pushed current directory '$currentPath' to stack and moved to alias '$selectedAlias' at path '$path'." -ForegroundColor Green
                            Set-Location $path
                        }
                        else {
                            Pop-Location
                            Write-Host "No matching alias found. Current directory was not changed." -ForegroundColor Yellow
                        }
                    }
                    else {
                        Write-Host "Pushed current directory '$currentPath' to stack." -ForegroundColor Yellow
                    }
                }
            }
            'o' {
                try {
                    $previousPath = (Get-Location).Path
                    Pop-Location
                    $newPath = (Get-Location).Path
                    Write-Host "Popped and moved from '$previousPath' to '$newPath'." -ForegroundColor Green
                }
                catch {
                    Write-Warning "Directory stack is empty or an error occurred."
                }
            }
            default {
                $selectedAlias = _goto_print_similar -aliasInput $Command
                if ($selectedAlias) {
                    $path = $Global:DirectoryAliases[$selectedAlias]
                    Set-Location $path
                }
                else {
                    Write-Host "Usage: goto [ r <alias> <path> | u <alias> | l | x <alias> | c | p <alias> | o | <alias>]"
                }
            }
        }
    }
}

# Initialization when loading module
Initialize-GotoEnvironment
Import-Aliases

# Export of functions
Export-ModuleMember -Function goto, Import-Aliases, Initialize-GotoEnvironment, Update-GotoModule, Save-Aliases

Register-ArgumentCompleter -CommandName 'goto' -ScriptBlock {
    param($commandName, $wordToComplete, $commandAst, $fakeBoundParameters)
    $commands = 'r', 'u', 'l', 'x', 'c', 'p', 'o', 'update'  # Register, Unregister, List, eXpand, Cleanup, Push, Pop, Update
    $aliases = $Global:DirectoryAliases.Keys

    if ($wordToComplete -eq 'u' -or $wordToComplete -eq 'x') {
        $aliases | Where-Object { $_ -like "$wordToComplete*" } | ForEach-Object {
            [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterValue', $_)
        }
    }
    else {
        $commands | Where-Object { $_ -like "$wordToComplete*" } | ForEach-Object {
            [System.Management.Automation.CompletionResult]::new($_, $_, 'ParameterValue', "Perform $_ operation")
        }
    }
}

$Global:DirectoryAliases.Keys | ForEach-Object {
    Export-ModuleMember -Alias "cd$_"
}