<#
.SYNOPSIS
    Starts the Likwid development environment.
.DESCRIPTION
    Starts PostgreSQL (via Podman), backend (Rust/Axum), and frontend (Astro).
    Use dev-stop.ps1 to stop all services.
#>
[CmdletBinding()]
param()

$ErrorActionPreference = 'Stop'

# Paths
$root = Split-Path -Parent $PSScriptRoot
$stateDir = Join-Path $PSScriptRoot '.dev'
$stateFile = Join-Path $stateDir 'state.json'
$backendLog = Join-Path $stateDir 'backend.log'
$frontendLog = Join-Path $stateDir 'frontend.log'

New-Item -ItemType Directory -Force -Path $stateDir | Out-Null

# Environment
if (-not $env:POSTGRES_USER) { $env:POSTGRES_USER = 'likwid' }
if (-not $env:POSTGRES_PASSWORD) { $env:POSTGRES_PASSWORD = 'likwid' }
if (-not $env:POSTGRES_DB) { $env:POSTGRES_DB = 'likwid' }
$env:DATABASE_URL = "postgres://$($env:POSTGRES_USER):$($env:POSTGRES_PASSWORD)@127.0.0.1:5432/$($env:POSTGRES_DB)"

# Check if already running
if (Test-Path $stateFile) {
    $state = Get-Content -Raw $stateFile | ConvertFrom-Json -ErrorAction SilentlyContinue
    if ($state -and $state.backendPid) {
        $p = Get-Process -Id $state.backendPid -ErrorAction SilentlyContinue
        if ($p) {
            Write-Host "Already running (backend PID $($state.backendPid)). Run dev-stop.ps1 first."
            exit 0
        }
    }
}

# Start Podman machine if needed
try {
    $machines = podman machine list --format json 2>$null | ConvertFrom-Json
    $running = $machines | Where-Object { $_.Running -eq $true }
    if (-not $running) {
        Write-Host "Starting Podman machine..."
        podman machine start ($machines | Select-Object -First 1).Name 2>$null
    }
} catch {
    Write-Host "Podman machine check failed (may already be running)"
}

# Start PostgreSQL container
Write-Host "Starting PostgreSQL..."
$composeFile = Join-Path $root 'compose/dev.yml'

$composeExitCode = 0
try {
    podman-compose -f $composeFile up -d 2>$null
    $composeExitCode = $LASTEXITCODE
} catch {
    $composeExitCode = $LASTEXITCODE
}
if ($composeExitCode -ne 0) {
    $containerExistsExitCode = 0
    try {
        podman container exists likwid-postgres 2>$null
        $containerExistsExitCode = $LASTEXITCODE
    } catch {
        $containerExistsExitCode = $LASTEXITCODE
    }
    if ($containerExistsExitCode -ne 0) {
        throw "Failed to start PostgreSQL via podman-compose (exit code: $composeExitCode)."
    }
    Write-Host "Warning: podman-compose returned exit code $composeExitCode, but likwid-postgres exists. Continuing."
}

# Wait for PostgreSQL to be ready
$maxWait = 30
for ($i = 0; $i -lt $maxWait; $i++) {
    $pg = netstat -ano 2>$null | Select-String ':5432.*LISTENING'
    if ($pg) { break }
    Start-Sleep -Seconds 1
}

Write-Host "Running database migrations..."
Push-Location (Join-Path $root 'backend')
try {
    sqlx migrate run --ignore-missing
    if ($LASTEXITCODE -ne 0) {
        throw "Failed to run database migrations (sqlx migrate run)."
    }
} finally {
    Pop-Location
}

# Start backend
Write-Host "Starting backend..."
$backend = Start-Process -FilePath 'cmd.exe' `
    -ArgumentList '/c', 'cargo', 'run', '2>&1' `
    -WorkingDirectory (Join-Path $root 'backend') `
    -PassThru -WindowStyle Hidden `
    -RedirectStandardOutput $backendLog

# Start frontend
Write-Host "Starting frontend..."
$frontend = Start-Process -FilePath 'cmd.exe' `
    -ArgumentList '/c', "set PUBLIC_API_BASE=http://127.0.0.1:3000&& npm run dev", '2>&1' `
    -WorkingDirectory (Join-Path $root 'frontend') `
    -PassThru -WindowStyle Hidden `
    -RedirectStandardOutput $frontendLog

# Save state
@{
    backendPid = $backend.Id
    frontendPid = $frontend.Id
    startedAt = (Get-Date).ToString('o')
} | ConvertTo-Json | Set-Content -Encoding UTF8 $stateFile

# Brief wait for startup
Start-Sleep -Seconds 3

# Status report
Write-Host ""
Write-Host "=== Likwid Dev Environment ==="
if (-not $backend.HasExited) {
    Write-Host "Backend:   Running (PID $($backend.Id)) - http://127.0.0.1:3000"
} else {
    Write-Host "Backend:   FAILED - check $backendLog"
}
if (-not $frontend.HasExited) {
    Write-Host "Frontend:  Running (PID $($frontend.Id)) - http://localhost:4321"
} else {
    Write-Host "Frontend:  FAILED - check $frontendLog"
}
Write-Host "PostgreSQL: Running on port 5432"
Write-Host ""
Write-Host "Logs: $stateDir"
Write-Host "Stop: .\scripts\dev-stop.ps1"