[CmdletBinding(SupportsShouldProcess)]param()

function RemoveAlias {
    param([string]$Name)
    $local:a = $Name | Where-Object { $_ } | Get-Alias -ErrorAction SilentlyContinue
    if ( -not $a ) { return }
    if ( Get-Command -ListImported Remove-Alias -ErrorAction SilentlyContinue ) {
        $a | Remove-Alias -Scope $MyAliasScope -ErrorAction SilentlyContinue
    }
    else {
        Remove-Item "Alias:$a"
    }
}
function SafeSetAlias {
    param([string]$Name, [string]$Value, [string]$Description)

    . RemoveAlias $Name
    try {
        Set-Alias $Name $Value -Scope $MyAliasScope -Description:$Description -ErrorAction Stop
    }
    catch {
        Set-Alias $Name $Value -Scope $MyAliasScope -Description:$Description -Option AllScope
    }
}

try { Get-Alias Get-MyAliases -ErrorAction Stop | ForEach-Object { . RemoveAlias $($_.Name) } } catch {}
function Get-MyAliases {
    [CmdletBinding()]param([switch]$ScriptsOnly)

    $local:allAliases = @()

    $MyAliasScope = 0
    $local:_scope = 0
    $local:_done = $false
    do {
        try {
            $local:newAliases += Get-Alias -Scope $_scope |
                Where-Object {
                    ($_.Definition -like "$MyPSScriptRoot*") -or (-not $ScriptsOnly -and ($_.Description -match '#MyAlias'))
                }
            if ( $newAliases ) {
                $allAliases += $newAliases
                $MyAliasScope = $_scope;
                Write-Verbose "`$MyAliasScope is now set to $MyAliasScope"
            }
        }
        catch {
            Write-Verbose "catch: $($_.Exception.Message)"
            $_done = $_.Exception.Message -match 'The scope .* exceeds'
        }
        $_scope += 1
    } until ( $_done )

    $allAliases
}

function getScriptName {
    param([string]$FullPath)
    $FullPath -replace '\.ps1$', '' -replace "^$([regex]::Escape($MyPSScriptRoot)).", ''
}

$local:IsVerbose = [bool]($PSBoundParameters['Verbose'])

# Loads mandatory Package code
try {
    $null = [Packagesz]
}
catch {
    $local:PackagePath = $(Join-Path $MyPSScriptRoot 'base')
    Join-Path $(Join-Path $PackagePath profile.d) 'classes.ps1' |
        Where-Object { Test-Path $_ } | ForEach-Object { . $_ }
}
$local:myPackages = Get-MyPackages -ReturnFullPath -IncludeRoot | Get-Item

$local:myAliases = [ordered]@{}

$myPackages | 
    ForEach-Object { Join-Path $_.FullName Aliases } |
    Where-Object { Test-Path $_ } |
    Get-ChildItem | ForEach-Object {
        $myAliases[$_.BaseName] = Get-Content $_.FullName
    }

$script:MyAliasScope = 0

$local:oldAliases = Get-MyAliases

$oldAliases = Get-Alias -Scope $MyAliasScope |
    Where-Object Name -in $($oldAliases.Name + $myAliases.Keys)

if ( $oldAliases -and $IsVerbose ) { 
    Write-Verbose "Removing: $($oldAliases.Name -join ', ')"
}
$oldAliases | ForEach-Object { . RemoveAlias $($_.Name) }

if ( $(. Get-ScopeDepth) -gt 0 ) {
    Write-Host -ForegroundColor Red "Try sourcing Reload-MyScripts instead of just running it"
}

foreach ( $local:PackagePath in $myPackages ) {
    #$local:PackageName = $PackagePath.Name

    Join-Path $PackagePath 'profile.d' | Where-Object { Test-Path $_ } |
        Get-ChildItem -Filter '*.ps1' |
        ForEach-Object {
            Write-Verbose "Loading $(getScriptName $_.FullName)...";
            ". '$($_.FullName)';"
        } |
        Invoke-Expression

    Join-Path $PackagePath 'profile.d' | Where-Object { Test-Path $_ } |
        Get-ChildItem -Filter '*.format.ps1xml' |
        ForEach-Object {
            Write-Verbose "Loading $(getScriptName $_.FullName)...";
            "Update-FormatData '$($_.FullName)';"
        } |
        Invoke-Expression

    $local:CommandsToAlias = (
        @( $PackagePath ) + $(
            [SystemName]::_GetValidValues("", $true, $true) |
                ForEach-Object {
                    Join-Path $PackagePath "sys.$_"
                }
            )) |
            Where-Object { Test-Path $_ } |
            ForEach-Object {
                Get-ChildItem (Join-Path $_ '*.ps1') | Where-Object Name -notmatch '\.inc\.ps1$'
            }
    
    foreach ( $local:newAlias in $CommandsToAlias ) {
        Write-Verbose "Creating alias for $(getScriptName $newAlias.FullName) Script..."
        . SafeSetAlias $($newAlias.BaseName) $($newAlias.FullName)
    }
}

foreach ( $local:alias in $myAliases.Keys ) {
    Write-Verbose "Adding $($alias) alias..."
    . SafeSetAlias $alias $myAliases[$alias] '#MyAlias'
}

Remove-Item Function:\RemoveAlias, Function:\SafeSetAlias -ErrorAction SilentlyContinue