param(
    [switch]$Build
)

$ErrorActionPreference = "Stop"

$projectRoot = (Resolve-Path (Join-Path $PSScriptRoot "..")).Path
Set-Location -LiteralPath $projectRoot

$imageInputFiles = @(
    "Dockerfile",
    "requirements.txt",
    ".dockerignore",
    "compose.yaml",
    "compose.dev.yaml"
)
$fingerprintLines = foreach ($relativePath in $imageInputFiles) {
    $filePath = Join-Path $projectRoot $relativePath
    if (Test-Path -LiteralPath $filePath) {
        "$relativePath=$((Get-FileHash -Algorithm SHA256 -LiteralPath $filePath).Hash)"
    } else {
        "$relativePath=MISSING"
    }
}
$fingerprintText = $fingerprintLines -join "`n"
$hashAlgorithm = [System.Security.Cryptography.SHA256]::Create()
try {
    $fingerprintBytes = [System.Text.Encoding]::UTF8.GetBytes($fingerprintText)
    $currentFingerprint = ([System.BitConverter]::ToString($hashAlgorithm.ComputeHash($fingerprintBytes))).Replace("-", "").ToLowerInvariant()
} finally {
    $hashAlgorithm.Dispose()
}
$stateDir = Join-Path $projectRoot ".dev-state"
$stateFile = Join-Path $stateDir "docker-image-inputs.sha256"
$previousFingerprint = if (Test-Path -LiteralPath $stateFile) {
    (Get-Content -LiteralPath $stateFile -Raw).Trim()
} else {
    ""
}
$inputsChanged = -not $previousFingerprint -or $previousFingerprint -ne $currentFingerprint
$shouldBuild = $Build -or $inputsChanged

$composeArgs = @("-f", "compose.yaml", "-f", "compose.dev.yaml", "up", "-d")
if ($shouldBuild) {
    $composeArgs += "--build"
}

if ($Build) {
    Write-Host "Image rebuild requested explicitly with -Build."
} elseif ($inputsChanged) {
    Write-Host "Docker image inputs changed or were not recorded yet; rebuilding automatically."
} else {
    Write-Host "Docker image inputs are unchanged; starting without rebuild."
}

docker compose @composeArgs
New-Item -ItemType Directory -Force -Path $stateDir | Out-Null
Set-Content -LiteralPath $stateFile -Value $currentFingerprint -NoNewline
docker compose -f compose.yaml -f compose.dev.yaml ps

Write-Host ""
Write-Host "Development server: http://127.0.0.1:8010"
Write-Host "Source edits reload automatically."
Write-Host "Dependency and Docker image-setting changes are detected and rebuilt automatically."
Write-Host "Use -Build only when you intentionally want to force a clean image check."