#Requires -Version 5.1
Set-StrictMode -Version Latest

function wStep { param([string]$t); Write-Host "  [>] $t" -ForegroundColor Yellow }
function wOK   { param([string]$t); Write-Host "  [+] $t" -ForegroundColor Green }
function wFail { param([string]$t); Write-Host "  [-] $t" -ForegroundColor Red }
function wInfo { param([string]$t); Write-Host "  [i] $t" -ForegroundColor Gray }

Clear-Host
Write-Host "  ================================================" -ForegroundColor Cyan
Write-Host "   NetworkSwitchDiscovery - Kurulum Sihirbazi"      -ForegroundColor Cyan
Write-Host "  ================================================" -ForegroundColor Cyan
Write-Host ""

# 1. PowerShell versiyonu
wStep "PowerShell versiyonu..."
if ($PSVersionTable.PSVersion.Major -lt 5) {
    wFail "PowerShell 5.1+ gerekli. Mevcut: $($PSVersionTable.PSVersion)"; exit 1
}
wOK "PowerShell $($PSVersionTable.PSVersion) - Uyumlu"

# 2. ExecutionPolicy
wStep "ExecutionPolicy kontrol..."
$pol = Get-ExecutionPolicy -Scope CurrentUser
if ($pol -in @("Restricted","AllSigned")) {
    wInfo "Policy $pol - RemoteSigned olarak degistiriliyor..."
    Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser -Force
    wOK "ExecutionPolicy: RemoteSigned"
} else {
    wOK "ExecutionPolicy: $pol (uygun)"
}

# 3. Klasor yapisi
wStep "Klasor yapisi..."
$libDir = Join-Path $PSScriptRoot "lib"
if (-not (Test-Path $libDir)) {
    New-Item -ItemType Directory -Path $libDir | Out-Null
    wOK "lib\ olusturuldu"
} else {
    wOK "lib\ mevcut"
}

# 4. NuGet
wStep "NuGet provider..."
$nuget = Get-PackageProvider -Name NuGet -ErrorAction SilentlyContinue
if (-not $nuget -or $nuget.Version -lt [version]"2.8.5.201") {
    wInfo "NuGet kuruluyor..."
    Install-PackageProvider -Name NuGet -MinimumVersion 2.8.5.201 -Scope CurrentUser -Force | Out-Null
    wOK "NuGet kuruldu"
} else {
    wOK "NuGet: $($nuget.Version)"
}

# 5. PSGallery
wStep "PSGallery trust..."
$gal = Get-PSRepository -Name PSGallery -ErrorAction SilentlyContinue
if ($gal -and $gal.InstallationPolicy -ne "Trusted") {
    Set-PSRepository -Name PSGallery -InstallationPolicy Trusted
    wOK "PSGallery: Trusted"
} else {
    wOK "PSGallery: Trusted (zaten)"
}

# 6. Posh-SSH
wStep "Posh-SSH..."
$posh = Get-Module -ListAvailable -Name Posh-SSH | Select-Object -First 1
if (-not $posh) {
    wInfo "Posh-SSH bulunamadi, kuruluyor..."
    try {
        Install-Module -Name Posh-SSH -Scope CurrentUser -Force -AllowClobber
        wOK "Posh-SSH kuruldu"
    } catch {
        wFail "Posh-SSH kurulamadi: $($_.Exception.Message)"
        wInfo "Manuel: Install-Module Posh-SSH -Scope CurrentUser -Force"
    }
} else {
    wOK "Posh-SSH v$($posh.Version) mevcut"
}

# 7. ThreadJob (PS 5.1 icin)
wStep "ThreadJob (PS 5.1 icin)..."
if ($PSVersionTable.PSVersion.Major -ge 7) {
    wOK "PS 7+ - ThreadJob gereksiz, RunspacePool kullaniliyor"
} else {
    $tj = Get-Module -ListAvailable -Name ThreadJob | Select-Object -First 1
    if (-not $tj) {
        wInfo "ThreadJob bulunamadi, kuruluyor..."
        try {
            Install-Module -Name ThreadJob -Scope CurrentUser -Force
            wOK "ThreadJob kuruldu"
        } catch {
            wInfo "ThreadJob kurulamadi (opsiyonel): $($_.Exception.Message)"
        }
    } else {
        wOK "ThreadJob v$($tj.Version) mevcut"
    }
}

# 8. SharpSnmpLib (opsiyonel)
wStep "SharpSnmpLib.dll (opsiyonel)..."
$dll = Join-Path $PSScriptRoot "lib\SharpSnmpLib.dll"
if (Test-Path $dll) {
    wOK "SharpSnmpLib.dll mevcut"
} else {
    wInfo "SharpSnmpLib.dll yok - yerlesik UDP SNMP (v1/v2c) kullanilacak"
    wInfo "v3 icin: https://www.nuget.org/packages/SharpSnmpLib"
    wInfo "Indirip lib\ klasorune kopyalayin"
}

# 9. Script dosyalari
wStep "Script dosyalari..."
$ok = $true
foreach ($f in @("Invoke-SwitchDiscovery.ps1","Start-SwitchDiscovery.ps1")) {
    $p = Join-Path $PSScriptRoot $f
    if (Test-Path $p) { wOK "$f mevcut" }
    else { wFail "$f EKSIK!"; $ok = $false }
}

Write-Host ""
Write-Host "  ================================================" -ForegroundColor Cyan
if ($ok) {
    Write-Host "  Kurulum TAMAMLANDI!" -ForegroundColor Green
    Write-Host ""
    Write-Host "  Baslangic:" -ForegroundColor White
    Write-Host "    .\Start-SwitchDiscovery.ps1" -ForegroundColor Cyan
    Write-Host ""
    Write-Host "  Veya dogrudan:" -ForegroundColor White
    Write-Host "    .\Invoke-SwitchDiscovery.ps1 -IPRange '192.168.1.0/24' -Username admin" -ForegroundColor Cyan
} else {
    Write-Host "  UYARI: Bazi dosyalar eksik!" -ForegroundColor Yellow
}
Write-Host "  ================================================" -ForegroundColor Cyan
Write-Host ""
Read-Host "  Cikmak icin Enter"