#requires -Version 7.0
<#
.SYNOPSIS
    Launches the interactive Conditional Access Policy Wizard (TUI).

.DESCRIPTION
    Starts the Python-based TUI wizard that guides you through tenant,
    user, admin, guest, and application policy choices. The wizard
    generates a deployment-ready YAML baseline using the structured
    naming convention.

    Automatically locates the project venv or system Python with the
    required packages (rich, pyyaml).

.EXAMPLE
    ./Scripts/Start-CAWizard.ps1
#>
[CmdletBinding()]
param()

$ErrorActionPreference = 'Stop'

$wizardPath = Join-Path $PSScriptRoot 'ca-wizard.py'
if (-not (Test-Path $wizardPath)) {
    throw "Wizard script not found: $wizardPath"
}

# =====================================================================
# Resolve Python interpreter
# =====================================================================

function Test-PythonPackages {
    param([string]$PyExe)
    if (-not $PyExe) { return $false }
    try {
        $result = & $PyExe -c "import rich, yaml" 2>&1
        return ($LASTEXITCODE -eq 0)
    } catch {
        return $false
    }
}

$candidates = [System.Collections.Generic.List[string]]::new()

# 1. Project venv (Linux/macOS)
$venvPy = Join-Path (Split-Path $PSScriptRoot -Parent) '.venv-pdf/bin/python3'
if (Test-Path $venvPy) { $candidates.Add($venvPy) }

# 2. Project venv (Windows)
$venvPyWin = Join-Path (Split-Path $PSScriptRoot -Parent) '.venv-pdf/Scripts/python.exe'
if (Test-Path $venvPyWin) { $candidates.Add($venvPyWin) }

# 3. Common system commands
foreach ($cmd in @('python3', 'python')) {
    $found = Get-Command $cmd -ErrorAction SilentlyContinue
    if ($found) { $candidates.Add($found.Source) }
}

$pythonPath = $null
foreach ($c in $candidates) {
    if (Test-PythonPackages -PyExe $c) {
        $pythonPath = $c
        break
    }
}

# If nothing has the packages, try installing into the venv
if (-not $pythonPath) {
    $venvPy = $candidates | Where-Object { $_ -match '\.venv' } | Select-Object -First 1
    if ($venvPy -and (Test-Path $venvPy)) {
        Write-Host "Installing required packages into venv..." -ForegroundColor Yellow
        $pip = Join-Path (Split-Path $venvPy -Parent) 'pip'
        if (-not (Test-Path $pip)) { $pip = Join-Path (Split-Path $venvPy -Parent) 'pip3' }
        & $pip install rich pyyaml 2>&1 | ForEach-Object { Write-Host "  $_" -ForegroundColor DarkGray }
        if (Test-PythonPackages -PyExe $venvPy) {
            $pythonPath = $venvPy
        }
    }
}

if (-not $pythonPath) {
    throw @"
Could not find a Python interpreter with 'rich' and 'pyyaml' installed.

Please install the requirements:
  python3 -m pip install rich pyyaml

Or activate the project venv manually:
  source .venv-pdf/bin/activate
  python3 Scripts/ca-wizard.py
"@
}

Write-Host "Using Python: $pythonPath" -ForegroundColor DarkGray

# =====================================================================
# Run wizard
# =====================================================================
& $pythonPath $wizardPath