param(
    [switch]$SkipBuild,
    [string]$ManifestBaseUrl = "",
    [string]$PublishDir = "",
    [string]$ReleaseNotes = "",
    [string]$MinSupported = "",
    [switch]$Mandatory
)

$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 = "CMBot"

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"
        }
    }
}

function Join-Url {
    param(
        [string]$BaseUrl,
        [string]$Name
    )

    if (-not $BaseUrl) {
        return $Name
    }
    if (-not $BaseUrl.EndsWith("/")) {
        $BaseUrl = "$BaseUrl/"
    }
    return (New-Object -TypeName System.Uri -ArgumentList ([System.Uri]$BaseUrl), $Name).AbsoluteUri
}

$LauncherName = "Launcher"
$AppName = Read-VersionValue -Path $VersionFile -Name "APP_NAME"
$AppVersion = Read-VersionValue -Path $VersionFile -Name "APP_VERSION"
$ReleaseName = "$AppExeName-$AppVersion"
$ReleaseDir = Join-Path $ReleaseRoot $ReleaseName            # portable layout root
$AppDir = Join-Path $ReleaseDir "app"                        # becomes app\ on the client
$UpdateZip = Join-Path $ReleaseRoot "$ReleaseName.zip"       # self-update payload (app\ contents)
$PortableZip = Join-Path $ReleaseRoot "$ReleaseName-portable.zip"  # initial install
$ManifestPath = Join-Path $ReleaseRoot "manifest.json"
$AppPyiOut = Join-Path $DistDir $AppExeName                  # dist\CMBot (onedir)
$LauncherPyiOut = Join-Path $DistDir "$LauncherName.exe"     # dist\Launcher.exe (onefile)
$AppExePath = Join-Path $AppDir "$AppExeName.exe"
$LauncherExePath = Join-Path $ReleaseDir "$LauncherName.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, $AppPyiOut, $LauncherPyiOut, $ReleaseDir, $UpdateZip, $PortableZip, $ManifestPath)) {
    Assert-InProject -Path $path
    if (Test-Path -LiteralPath $path) {
        Remove-Item -LiteralPath $path -Recurse -Force
    }
}

if (-not $SkipBuild) {
    # Main app (onedir, windowed GUI)
    & 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 (app) build failed."
    }

    # Update launcher (onefile; console shows download/swap progress).
    # Lean: launcher only imports services/* (stdlib), no PySide6/Pillow.
    & python -m PyInstaller `
        --noconfirm `
        --clean `
        --onefile `
        --console `
        --name $LauncherName `
        --paths $SrcDir `
        "$SrcDir\launcher.py"
    if ($LASTEXITCODE -ne 0) {
        throw "PyInstaller (launcher) build failed."
    }
}

if (-not (Test-Path -LiteralPath $AppPyiOut)) {
    throw "PyInstaller app output not found: $AppPyiOut"
}
if (-not (Test-Path -LiteralPath $LauncherPyiOut)) {
    throw "PyInstaller launcher output not found: $LauncherPyiOut"
}

# Assemble the portable layout: <ReleaseDir>\Launcher.exe + <ReleaseDir>\app\
New-Item -ItemType Directory -Force -Path $ReleaseDir | Out-Null
Copy-Item -LiteralPath $AppPyiOut -Destination $AppDir -Recurse
Copy-Item -LiteralPath $DefaultConfigDir -Destination (Join-Path $AppDir "config") -Recurse
Set-Content -LiteralPath (Join-Path $AppDir "version.txt") -Value $AppVersion -Encoding ascii -NoNewline
Copy-Item -LiteralPath $LauncherPyiOut -Destination $LauncherExePath -Force

$ReadmePath = Join-Path $ReleaseDir "README.txt"
$Readme = @(
    "$AppName $AppVersion",
    "",
    "Start:",
    "Double-click Launcher.exe.",
    "",
    "Notes:",
    "- Extract this folder to any writable location (e.g. D:\CMBot or the Desktop).",
    "- Do NOT put it under C:\Program Files or the C: drive root (not writable).",
    "- Your settings, templates and exports live in %USERPROFILE%\.cmbot.",
    "- The app itself is in app\; Launcher.exe checks for updates on start."
)
Set-Content -LiteralPath $ReadmePath -Value $Readme -Encoding UTF8

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

# Self-update payload: contents of app\ (CMBot.exe at the zip root). manifest.url
# points here; the launcher downloads, verifies and swaps it into app\.
Compress-Archive -Path (Join-Path $AppDir "*") -DestinationPath $UpdateZip -Force
# Initial install: the full portable layout (Launcher.exe + app\).
Compress-Archive -Path (Join-Path $ReleaseDir "*") -DestinationPath $PortableZip -Force
$ReleaseHash = (Get-FileHash -LiteralPath $UpdateZip -Algorithm SHA256).Hash
$ReleaseSize = (Get-Item -LiteralPath $UpdateZip).Length
if (-not $MinSupported) {
    $MinSupported = $AppVersion
}
$Manifest = [ordered]@{
    version = $AppVersion
    url = Join-Url -BaseUrl $ManifestBaseUrl -Name (Split-Path -Leaf $UpdateZip)
    sha256 = $ReleaseHash
    size = $ReleaseSize
    mandatory = [bool]$Mandatory
    min_supported = $MinSupported
    notes = $ReleaseNotes
}
# Write UTF-8 WITHOUT BOM: Set-Content -Encoding UTF8 emits a BOM that breaks
# json.loads in the in-app update check (services/update_service.py).
[System.IO.File]::WriteAllText(
    $ManifestPath,
    ($Manifest | ConvertTo-Json),
    (New-Object System.Text.UTF8Encoding $false)
)

if ($PublishDir) {
    # Update server needs only the payload zip + manifest.
    New-Item -ItemType Directory -Force -Path $PublishDir | Out-Null
    Copy-Item -LiteralPath $UpdateZip -Destination $PublishDir -Force
    Copy-Item -LiteralPath $ManifestPath -Destination $PublishDir -Force
    Write-Host "Published update files to: $PublishDir"
}

Write-Host "Portable layout: $ReleaseDir  (Launcher.exe + app\)"
Write-Host "Initial install zip: $PortableZip"
Write-Host "Update payload zip:  $UpdateZip"
Write-Host "Manifest: $ManifestPath"