# Starts Child Gold Land backend + frontend for local dev.
# Manages only processes started by this script. No npm install / rebuild on each run.
#
# Usage:
#   pwsh -File .\scripts\dev-local-stack.ps1
#   pwsh -File .\scripts\dev-local-stack.ps1 -UseTestPorts -SmokeTest   # alt ports + health/login probe then exit
#
# Default ports: backend 3000, frontend 5174. Test ports: 3010 / 5184 (when 3000/5174 are busy).

param(
  [switch]$UseTestPorts,
  [switch]$SmokeTest
)

$ErrorActionPreference = 'Stop'

$BackendRoot = (Resolve-Path (Join-Path $PSScriptRoot '..')).Path
$WorkspaceRoot = (Resolve-Path (Join-Path $BackendRoot '..')).Path
$FrontendRoot = Join-Path $WorkspaceRoot 'frontend'

if ($UseTestPorts) {
  $BackendPort = 3010
  $FrontendPort = 5190
} else {
  $BackendPort = 3000
  $FrontendPort = 5174
}

$HealthUrl = "http://127.0.0.1:${BackendPort}/health"
$FrontendUrl = "http://localhost:${FrontendPort}/"
$LoginProxyUrl = "http://localhost:${FrontendPort}/api/auth/login"

$script:ManagedProcesses = @()
$script:TempDbDir = $null

function Write-Info([string]$Message) { Write-Host $Message -ForegroundColor Cyan }
function Write-Warn([string]$Message) { Write-Host $Message -ForegroundColor Yellow }
function Write-Err([string]$Message) { Write-Host $Message -ForegroundColor Red }

function Test-NodeEngines {
  if (-not (Get-Command node -ErrorAction SilentlyContinue)) {
    throw 'Node.js not found in PATH. Install Node ^22.18.0 or >=24.12.0 (see .nvmrc).'
  }
  $raw = (node -v).TrimStart('v')
  $ver = [version]$raw
  $ok = ($ver.Major -eq 22 -and $ver -ge [version]'22.18.0') -or ($ver.Major -ge 24 -and $ver -ge [version]'24.12.0')
  if (-not $ok) {
    throw "Node v$raw is not supported. Required: ^22.18.0 or >=24.12.0. Run: nvm install 22.18.0 && nvm use 22.18.0"
  }
  Write-Info "Node $(node -v) at $((Get-Command node).Source)"
}

function Test-RepoLayout {
  if (-not (Test-Path (Join-Path $BackendRoot 'package.json'))) {
    throw "Backend package.json not found at $BackendRoot"
  }
  if (-not (Test-Path (Join-Path $FrontendRoot 'package.json'))) {
    throw "Frontend not found at `"$FrontendRoot`" (expected sibling of backend-nest)."
  }
}

function Test-DependenciesPresent {
  if (-not (Test-Path (Join-Path $BackendRoot 'node_modules'))) {
    throw "Backend node_modules missing. Run once: cd `"$BackendRoot`"; npm install"
  }
  if (-not (Test-Path (Join-Path $FrontendRoot 'node_modules'))) {
    throw "Frontend node_modules missing. Run once: cd `"$FrontendRoot`"; npm install"
  }
}

function Get-ListenProcessId([int]$Port) {
  $conn = Get-NetTCPConnection -LocalPort $Port -State Listen -ErrorAction SilentlyContinue | Select-Object -First 1
  if ($conn) { return [int]$conn.OwningProcess }
  return $null
}

function Assert-PortFree([int]$Port, [string]$Label) {
  $ownerPid = Get-ListenProcessId $Port
  if ($null -ne $ownerPid) {
    $name = (Get-Process -Id $ownerPid -ErrorAction SilentlyContinue).ProcessName
    throw "${Label} port $Port is in use (PID $ownerPid, $name). Use -UseTestPorts or free the port."
  }
}

function New-BackendProcessEnvironment {
  $envMap = @{}
  foreach ($entry in [System.Environment]::GetEnvironmentVariables('Process').GetEnumerator()) {
    $envMap[$entry.Key] = [string]$entry.Value
  }
  $envMap['PORT'] = [string]$BackendPort
  $envMap['HOST'] = '0.0.0.0'
  $envMap['NODE_ENV'] = 'development'
  $envMap['CORS_ORIGIN'] = "http://localhost:${FrontendPort}"
  if ($UseTestPorts) {
    $script:TempDbDir = Join-Path ([System.IO.Path]::GetTempPath()) ("cgl-devstack-" + [guid]::NewGuid().ToString('N'))
    New-Item -ItemType Directory -Path $script:TempDbDir -Force | Out-Null
    $envMap['DB_PATH'] = Join-Path $script:TempDbDir 'app.db'
    Write-Info "Test backend DB: $($envMap['DB_PATH'])"
  }
  return $envMap
}

function Start-ProcessWithEnv {
  param(
    [string]$FilePath,
    [string[]]$ArgumentList,
    [string]$WorkingDirectory,
    [hashtable]$Environment
  )
  $psi = New-Object System.Diagnostics.ProcessStartInfo
  $psi.FileName = $FilePath
  $psi.WorkingDirectory = $WorkingDirectory
  $psi.UseShellExecute = $false
  $psi.CreateNoWindow = $true
  if ($ArgumentList -and $ArgumentList.Count -gt 0) {
    $quoted = $ArgumentList | ForEach-Object {
      if ($_ -match '\s') { "`"$_`"" } else { $_ }
    }
    $psi.Arguments = $quoted -join ' '
  }
  foreach ($entry in [System.Environment]::GetEnvironmentVariables('Process').GetEnumerator()) {
    $psi.EnvironmentVariables[[string]$entry.Key] = [string]$entry.Value
  }
  foreach ($key in $Environment.Keys) {
    $psi.EnvironmentVariables[$key] = [string]$Environment[$key]
  }
  $proc = [System.Diagnostics.Process]::Start($psi)
  if (-not $proc) {
    throw "Failed to start process: $FilePath"
  }
  return $proc
}

function Start-Backend {
  $mainJs = Join-Path $BackendRoot 'dist\main.js'
  if (-not (Test-Path $mainJs)) {
    throw "Missing dist/main.js. Run once: cd `"$BackendRoot`"; npm run build"
  }
  $node = (Get-Command node).Source
  $envMap = New-BackendProcessEnvironment
  Write-Info "Starting backend on port $BackendPort ..."
  $p = Start-ProcessWithEnv -FilePath $node -ArgumentList @($mainJs) -WorkingDirectory $BackendRoot -Environment $envMap
  $script:ManagedProcesses += $p
  Start-Sleep -Milliseconds 500
  if ($p.HasExited) {
    throw "Backend exited immediately (exit $($p.ExitCode)). Build with current Node and check dist/main.js."
  }
  return $p
}

function Start-Frontend {
  $npm = (Get-Command npm.cmd -ErrorAction SilentlyContinue).Source
  if (-not $npm) {
    $npm = (Get-Command npm -ErrorAction SilentlyContinue).Source
  }
  if (-not $npm) {
    throw 'npm not found in PATH.'
  }
  $envMap = @{}
  foreach ($entry in [System.Environment]::GetEnvironmentVariables('Process').GetEnumerator()) {
    $envMap[$entry.Key] = [string]$entry.Value
  }
  $envMap['VITE_DEV_PORT'] = [string]$FrontendPort
  $envMap['VITE_DEV_API_TARGET'] = "http://127.0.0.1:${BackendPort}"
  Write-Info "Starting frontend on port $FrontendPort (proxy -> $($envMap['VITE_DEV_API_TARGET'])) ..."
  $p = Start-ProcessWithEnv -FilePath $npm -ArgumentList @('run', 'dev', '--', '--port', [string]$FrontendPort) `
    -WorkingDirectory $FrontendRoot -Environment $envMap
  $script:ManagedProcesses += $p
  return $p
}

function Wait-BackendHealth {
  param([int]$TimeoutSeconds = 90)
  Write-Info "Waiting for backend health (max ${TimeoutSeconds}s) ..."
  $deadline = (Get-Date).AddSeconds($TimeoutSeconds)
  while ((Get-Date) -lt $deadline) {
    foreach ($p in $script:ManagedProcesses) {
      if ($p.HasExited) {
        throw "Managed process exited early (PID $($p.Id), exit $($p.ExitCode))."
      }
    }
    try {
      $r = Invoke-WebRequest -Uri $HealthUrl -UseBasicParsing -TimeoutSec 3
      if ($r.StatusCode -eq 200) {
        Write-Info "Backend health OK: $HealthUrl"
        return
      }
    } catch {
      Start-Sleep -Seconds 2
    }
  }
  throw "Backend health timed out: $HealthUrl"
}

function Wait-FrontendHttp {
  param([int]$TimeoutSeconds = 120)
  Write-Info "Waiting for frontend (max ${TimeoutSeconds}s) ..."
  $deadline = (Get-Date).AddSeconds($TimeoutSeconds)
  while ((Get-Date) -lt $deadline) {
    try {
      $r = Invoke-WebRequest -Uri $FrontendUrl -UseBasicParsing -TimeoutSec 3
      if ($r.StatusCode -eq 200) {
        Write-Info "Frontend OK: $FrontendUrl"
        return
      }
    } catch {
      Start-Sleep -Seconds 2
    }
  }
  throw "Frontend HTTP timed out: $FrontendUrl"
}

function Test-ProxyLogin {
  $body = '{"username":"demo","password":"123456"}'
  $r = Invoke-WebRequest -Uri $LoginProxyUrl -Method POST -Body $body -ContentType 'application/json' -UseBasicParsing
  if ($r.StatusCode -ne 200) {
    throw "Proxy login failed: HTTP $($r.StatusCode)"
  }
  Write-Info "Proxy login OK: $LoginProxyUrl"
}

function Stop-ManagedProcesses {
  foreach ($p in $script:ManagedProcesses) {
    if ($p -and -not $p.HasExited) {
      Write-Info "Stopping PID $($p.Id) ..."
      try {
        & taskkill.exe /PID $p.Id /T /F 2>$null | Out-Null
      } catch {
        Stop-Process -Id $p.Id -Force -ErrorAction SilentlyContinue
      }
    }
  }
  $script:ManagedProcesses = @()
  if ($script:TempDbDir -and (Test-Path $script:TempDbDir)) {
    Remove-Item -Recurse -Force $script:TempDbDir -ErrorAction SilentlyContinue
    $script:TempDbDir = $null
  }
}

try {
  Write-Info 'Child Gold Land — local dev stack'
  if ($UseTestPorts) { Write-Warn 'Using test ports 3010 / 5190 (temp SQLite when backend starts fresh DB).' }
  Test-NodeEngines
  Test-RepoLayout
  Test-DependenciesPresent
  Assert-PortFree -Port $BackendPort -Label 'Backend'
  Assert-PortFree -Port $FrontendPort -Label 'Frontend'

  Start-Backend | Out-Null
  Start-Frontend | Out-Null
  Wait-BackendHealth
  if ($SmokeTest) {
    Wait-FrontendHttp
    Test-ProxyLogin
    Write-Info 'SmokeTest passed.'
    exit 0
  }

  Write-Host ''
  Write-Info "Frontend: $FrontendUrl"
  Write-Info "Backend health: $HealthUrl"
  Write-Info 'Demo login: demo / 123456'
  Write-Warn 'Press Ctrl+C to stop only processes started by this script.'
  Write-Host ''

  while ($true) {
    Start-Sleep -Seconds 2
    foreach ($p in $script:ManagedProcesses) {
      if ($p.HasExited) {
        Write-Err "Process PID $($p.Id) exited unexpectedly (code $($p.ExitCode))."
        exit 1
      }
    }
  }
} catch {
  Write-Err $_.Exception.Message
  exit 1
} finally {
  Stop-ManagedProcesses
}