$ErrorActionPreference = 'Stop'

function Stop-TrackedProcess {
    param(
        [string]$PidFile
    )

    if (-not (Test-Path $PidFile)) {
        return
    }

    $pidText = (Get-Content $PidFile -Raw).Trim()
    if (-not $pidText) {
        Remove-Item $PidFile -Force -ErrorAction SilentlyContinue
        return
    }

    $existing = Get-Process -Id ([int]$pidText) -ErrorAction SilentlyContinue
    if ($null -ne $existing) {
        Stop-Process -Id $existing.Id -Force
    }

    Remove-Item $PidFile -Force -ErrorAction SilentlyContinue
}

function Wait-HttpReady {
    param(
        [string]$Url,
        [int]$MaxAttempts = 60,
        [int]$SleepSeconds = 1
    )

    for ($i = 0; $i -lt $MaxAttempts; $i++) {
        try {
            $response = Invoke-WebRequest -UseBasicParsing -Uri $Url -TimeoutSec 3
            return $response
        } catch {
            Start-Sleep -Seconds $SleepSeconds
        }
    }

    return $null
}

function Show-LogTail {
    param(
        [string]$Path
    )

    if (Test-Path $Path) {
        Write-Host ""
        Write-Host "Last log lines: $Path"
        Get-Content $Path -Tail 40
    }
}

$repoRoot = (Resolve-Path (Join-Path $PSScriptRoot '..\..')).Path
$frontendRoot = Join-Path $repoRoot 'frontend\admin'
$runtimeRoot = Join-Path $repoRoot 'runtime'
$logsRoot = Join-Path $repoRoot 'logs'
$binRoot = Join-Path $repoRoot 'bin'
$cacheRoot = Join-Path $repoRoot '.cache\go'
$buildCache = Join-Path $repoRoot '.cache\go-build'
$modCache = Join-Path $cacheRoot 'pkg\mod'

New-Item -ItemType Directory -Force $runtimeRoot, $logsRoot, $binRoot, $cacheRoot, $buildCache, $modCache | Out-Null

$backendPidFile = Join-Path $runtimeRoot 'backend.pid'
$frontendPidFile = Join-Path $runtimeRoot 'frontend.pid'
$backendOut = Join-Path $logsRoot 'backend-dev.out.log'
$backendErr = Join-Path $logsRoot 'backend-dev.err.log'
$frontendOut = Join-Path $logsRoot 'frontend-dev.out.log'
$frontendErr = Join-Path $logsRoot 'frontend-dev.err.log'
$backendExe = Join-Path $binRoot 'server.exe'

Stop-TrackedProcess -PidFile $backendPidFile
Stop-TrackedProcess -PidFile $frontendPidFile

Remove-Item $backendOut, $backendErr, $frontendOut, $frontendErr -Force -ErrorAction SilentlyContinue

$env:GOPATH = $cacheRoot
$env:GOCACHE = $buildCache
$env:GOMODCACHE = $modCache

Push-Location $repoRoot
try {
    & go build -o $backendExe .\cmd\server
} finally {
    Pop-Location
}

$node = (Get-Command node).Source

$backendProcess = Start-Process -FilePath $backendExe `
    -WorkingDirectory $repoRoot `
    -RedirectStandardOutput $backendOut `
    -RedirectStandardError $backendErr `
    -PassThru
Set-Content -Path $backendPidFile -Value $backendProcess.Id

$frontendProcess = Start-Process -FilePath $node `
    -ArgumentList '.\node_modules\vite\bin\vite.js', '--configLoader', 'native', '--host', '0.0.0.0', '--port', '3000' `
    -WorkingDirectory $frontendRoot `
    -RedirectStandardOutput $frontendOut `
    -RedirectStandardError $frontendErr `
    -PassThru
Set-Content -Path $frontendPidFile -Value $frontendProcess.Id

$backendReady = Wait-HttpReady -Url 'http://127.0.0.1:8080/health'
$frontendReady = Wait-HttpReady -Url 'http://127.0.0.1:3000'

if ($null -eq $backendReady) {
    Write-Host 'Backend failed to become ready on http://127.0.0.1:8080/health'
    Show-LogTail -Path $backendErr
    Show-LogTail -Path $backendOut
    exit 1
}

if ($null -eq $frontendReady) {
    Write-Host 'Frontend failed to become ready on http://127.0.0.1:3000'
    Show-LogTail -Path $frontendErr
    Show-LogTail -Path $frontendOut
    exit 1
}

Write-Host ''
Write-Host "Backend ready: http://127.0.0.1:8080"
Write-Host "Frontend ready: http://127.0.0.1:3000"
Write-Host "Backend PID: $($backendProcess.Id)"
Write-Host "Frontend PID: $($frontendProcess.Id)"
Write-Host "Stop command: powershell -ExecutionPolicy Bypass -File scripts/dev/stop-preview-local.ps1"
Write-Host ""
Write-Host "Note: this repository does not ship a default admin account."
Write-Host "If login fails on first run, initialize one explicitly:"
Write-Host "  powershell -ExecutionPolicy Bypass -File scripts/dev/init-admin-local.ps1 -Username admin -Password '<strong-password>' -Email 'admin@example.com'"