<#
  SkillMate installer for Windows PowerShell.
  Installs dependencies for backend, frontend, admin panel and creates a backend .env with dev defaults.
#>

param(
  [switch]$SkipBuild
)

$ErrorActionPreference = 'Stop'

function New-RandomHex([int]$length) {
  if ($length % 2 -ne 0) { throw "Length must be even" }
  $bytes = New-Object byte[] ($length / 2)
  [System.Security.Cryptography.RandomNumberGenerator]::Fill($bytes)
  return ($bytes | ForEach-Object { $_.ToString('x2') }) -join ''
}

$scriptRoot = Split-Path -Parent $MyInvocation.MyCommand.Path
Write-Host "==> Installing SkillMate dependencies..." -ForegroundColor Cyan

if (-not (Get-Command node -ErrorAction SilentlyContinue)) {
  throw 'Node.js is required but was not found in PATH. Install Node.js LTS first.'
}

$npmVersion = (& npm --version)
Write-Host "   npm version $npmVersion detected." -ForegroundColor DarkGray

$projects = @('backend', 'frontend', 'admin-panel')
foreach ($project in $projects) {
  $projectPath = Join-Path $scriptRoot $project
  if (-not (Test-Path $projectPath)) {
    throw "Project folder '$project' not found."
  }

  Write-Host "--> Installing dependencies in $project..." -ForegroundColor Cyan
  Push-Location $projectPath
  try {
    if (Test-Path 'package-lock.json') {
      npm ci
    } else {
      npm install
    }
  } finally {
    Pop-Location
  }
}

$envPath = Join-Path $scriptRoot 'backend/.env'
if (-not (Test-Path $envPath)) {
  Write-Host '--> Creating backend/.env with development defaults...' -ForegroundColor Cyan
  $fieldKey = New-RandomHex 64
  $dbKey = New-RandomHex 64
  @(
    'NODE_ENV=development'
    'PORT=3004'
    "FIELD_ENCRYPTION_KEY=$fieldKey"
    "DATABASE_ENCRYPTION_KEY=$dbKey"
    'FRONTEND_URL=http://localhost:5173'
    'ADMIN_PANEL_URL=http://localhost:5174'
    'NODE_TYPE=admin'
  ) | Set-Content -Path $envPath -Encoding utf8
}

if (-not $SkipBuild) {
  Write-Host '==> Building frontend and admin panel...' -ForegroundColor Cyan
  foreach ($project in @('frontend', 'admin-panel')) {
    Push-Location (Join-Path $scriptRoot $project)
    try {
      npm run build
    } finally {
      Pop-Location
    }
  }
  Write-Host '==> Building backend...' -ForegroundColor Cyan
  Push-Location (Join-Path $scriptRoot 'backend')
  try {
    npm run build
  } finally {
    Pop-Location
  }
} else {
  Write-Host '!! SkipBuild set: build steps skipped.' -ForegroundColor DarkYellow
}

Write-Host "Installation complete. Use run-dev.cmd or run-prod.cmd to start services." -ForegroundColor Green