param(
    [switch]$SkipBuild
)

$ErrorActionPreference = "Stop"

$ScriptDir = Split-Path -Parent $MyInvocation.MyCommand.Path
$RootDir = Split-Path -Parent $ScriptDir
$SrcDir = Join-Path $RootDir "src"
$VersionFile = Join-Path $SrcDir "version.py"
$DefaultConfigDir = Join-Path $RootDir "packaging\default_config"
$BuildDir = Join-Path $RootDir "build"
$DistDir = Join-Path $RootDir "dist"
$ReleaseRoot = Join-Path $RootDir "release"
$AppExeName = "AutoPrint"

function Read-VersionValue {
    param(
        [string]$Path,
        [string]$Name
    )

    $pattern = "^\s*$Name\s*=\s*`"([^`"]+)`""
    foreach ($line in Get-Content -LiteralPath $Path -Encoding UTF8) {
        if ($line -match $pattern) {
            return $Matches[1]
        }
    }
    throw "Cannot find $Name in $Path"
}

function Assert-InProject {
    param([string]$Path)

    $resolvedRoot = (Resolve-Path -LiteralPath $RootDir).Path
    if (Test-Path -LiteralPath $Path) {
        $resolvedPath = (Resolve-Path -LiteralPath $Path).Path
        if (-not $resolvedPath.StartsWith($resolvedRoot, [System.StringComparison]::OrdinalIgnoreCase)) {
            throw "Refusing to modify path outside project: $resolvedPath"
        }
    }
}

$AppName = Read-VersionValue -Path $VersionFile -Name "APP_NAME"
$AppVersion = Read-VersionValue -Path $VersionFile -Name "APP_VERSION"
$ReleaseName = "$AppExeName-$AppVersion"
$ReleaseDir = Join-Path $ReleaseRoot $ReleaseName
$PyInstallerOutputDir = Join-Path $DistDir $AppExeName
$ExePath = Join-Path $ReleaseDir "$AppExeName.exe"

Write-Host "Building $AppName $AppVersion"

$pythonVersionText = & python --version
if ($LASTEXITCODE -ne 0) {
    throw "Python is not available."
}
if ($pythonVersionText -notmatch "Python 3\.7\.") {
    throw "Python 3.7 is required, current version: $pythonVersionText"
}

& python -c "import PyInstaller"
if ($LASTEXITCODE -ne 0) {
    throw "PyInstaller is not installed. Run: pip install -r requirements.txt"
}

if (-not (Test-Path -LiteralPath $DefaultConfigDir)) {
    throw "Default config directory not found: $DefaultConfigDir"
}

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

foreach ($path in @($BuildDir, $PyInstallerOutputDir, $ReleaseDir)) {
    Assert-InProject -Path $path
    if (Test-Path -LiteralPath $path) {
        Remove-Item -LiteralPath $path -Recurse -Force
    }
}

if (-not $SkipBuild) {
    & python -m PyInstaller `
        --noconfirm `
        --clean `
        --onedir `
        --windowed `
        --name $AppExeName `
        --paths $SrcDir `
        --add-data "$SrcDir\resources;resources" `
        "$SrcDir\main.py"
    if ($LASTEXITCODE -ne 0) {
        throw "PyInstaller build failed."
    }
}

if (-not (Test-Path -LiteralPath $PyInstallerOutputDir)) {
    throw "PyInstaller output not found: $PyInstallerOutputDir"
}

Copy-Item -LiteralPath $PyInstallerOutputDir -Destination $ReleaseDir -Recurse
Copy-Item -LiteralPath $DefaultConfigDir -Destination (Join-Path $ReleaseDir "config") -Recurse
New-Item -ItemType Directory -Force -Path (Join-Path $ReleaseDir "logs") | Out-Null
New-Item -ItemType Directory -Force -Path (Join-Path $ReleaseDir "output") | Out-Null

$ReadmePath = Join-Path $ReleaseDir "README.txt"
$Readme = @(
    "$AppName $AppVersion",
    "",
    "Start:",
    "Double-click $AppExeName.exe.",
    "",
    "Folders:",
    "- config: default config and custom templates.",
    "- logs: runtime logs.",
    "- output: default export folder.",
    "",
    "Do not delete dependency files in this folder."
)
Set-Content -LiteralPath $ReadmePath -Value $Readme -Encoding UTF8

if (-not (Test-Path -LiteralPath $ExePath)) {
    throw "Executable not found: $ExePath"
}

Write-Host "Release created: $ReleaseDir"