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
}

$AppName = Read-VersionValue -Path $VersionFile -Name "APP_NAME"
$AppVersion = Read-VersionValue -Path $VersionFile -Name "APP_VERSION"
$ReleaseName = "$AppExeName-$AppVersion"
$ReleaseDir = Join-Path $ReleaseRoot $ReleaseName
$ReleaseZip = Join-Path $ReleaseRoot "$ReleaseName.zip"
$ManifestPath = Join-Path $ReleaseRoot "manifest.json"
$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, $ReleaseZip, $ManifestPath)) {
    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
Set-Content -LiteralPath (Join-Path $ReleaseDir "version.txt") -Value $AppVersion -Encoding ascii -NoNewline

$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"
}

Compress-Archive -Path (Join-Path $ReleaseDir "*") -DestinationPath $ReleaseZip -Force
$ReleaseHash = (Get-FileHash -LiteralPath $ReleaseZip -Algorithm SHA256).Hash
$ReleaseSize = (Get-Item -LiteralPath $ReleaseZip).Length
if (-not $MinSupported) {
    $MinSupported = $AppVersion
}
$Manifest = [ordered]@{
    version = $AppVersion
    url = Join-Url -BaseUrl $ManifestBaseUrl -Name (Split-Path -Leaf $ReleaseZip)
    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) {
    New-Item -ItemType Directory -Force -Path $PublishDir | Out-Null
    Copy-Item -LiteralPath $ReleaseZip -Destination $PublishDir -Force
    Copy-Item -LiteralPath $ManifestPath -Destination $PublishDir -Force
    Write-Host "Published update files to: $PublishDir"
}

Write-Host "Release created: $ReleaseDir"
Write-Host "Release zip: $ReleaseZip"
Write-Host "Manifest: $ManifestPath"