<#
.SYNOPSIS
    Builds the CursorLang installer for handing the application round outside
    the Store.

.DESCRIPTION
    Nothing has to be installed beyond the .NET SDK: WiX arrives as a NuGet
    package, the same way makeappx does for the MSIX build.

    Nobody signs the result, so Windows warns about an unknown publisher and the
    user has to insist. Short of a certificate from a trusted authority there is
    no way round that, and it is the reason this installer is meant for people who
    already know where the file came from.

    The application is published with its own copy of .NET: Windows carries no
    runtime of its own, and a self-contained build is tied to x64.

.PARAMETER Install
    Runs the installer once it is built, to see the thing through the way a user
    would.

.EXAMPLE
    # Build and run it, to see what a user sees
    pwsh -File Packaging\build-installer.ps1 -Install

.EXAMPLE
    # What a release needs
    pwsh -File Packaging\build-installer.ps1 -Version 1.0.1
#>
[CmdletBinding()]
param(
    # Three numbers: unlike the Store, an installer keeps no place for a fourth
    [string] $Version = '1.0.0',

    [switch] $Install,

    [string] $OutputPath
)

Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

$root = $PSScriptRoot
$repository = Split-Path -Parent $root
$agentProject = Join-Path $repository 'CursorLang.Agent\CursorLang.Agent.csproj'
$settingsProject = Join-Path $repository 'CursorLang.Settings\CursorLang.Settings.csproj'
$installerProject = Join-Path $root 'Installer\CursorLang.wixproj'
$icon = Join-Path $repository 'CursorLang.Core\Resources\CursorLang.ico'
$license = Join-Path $repository 'LICENSE'

if (-not $OutputPath) { $OutputPath = Join-Path $repository 'artifacts' }
$stagingRoot = Join-Path $OutputPath 'installer-staging'
$installersPath = Join-Path $OutputPath 'installers'

if ($Version -notmatch '^\d+\.\d+\.\d+$') {
    throw "The version '$Version' does not fit: an installer is versioned by three numbers, for example 1.0.0."
}

if (-not (Test-Path $icon)) {
    throw "The icon is missing from '$icon'. Git LFS may have left a pointer in its place: run git lfs pull."
}

function Invoke-Tool {
    <#
        .SYNOPSIS
            Runs a program and fails the build if it returned an error.
        .DESCRIPTION
            A wrapper of our own is needed because PowerShell does not treat the
            failure of an external program as an error and quietly moves on.
    #>
    param(
        [string] $Path,
        [string[]] $Arguments
    )

    & $Path @Arguments
    if ($LASTEXITCODE -ne 0) {
        throw "'$([System.IO.Path]::GetFileName($Path))' exited with code $LASTEXITCODE."
    }
}

function Write-LicenseRtf {
    <#
        .SYNOPSIS
            Turns the plain-text LICENSE into the RTF the wizard needs.
        .DESCRIPTION
            The licence page of a Windows Installer wizard reads RTF and nothing
            else, and keeping a second copy of the licence in the repository would
            mean keeping the two in step by hand. The conversion is as plain as it
            looks: the text carries no formatting to preserve.
    #>
    param([string] $Path)

    $text = (Get-Content $license -Raw) -replace '\\', '\\\\' -replace '{', '\{' -replace '}', '\}'
    $body = ($text -split "`r?`n") -join '\par' + "`r`n"

    Set-Content -Path $Path -Value "{\rtf1\ansi\deff0{\fonttbl{\f0 Segoe UI;}}\fs18 $body}" -Encoding ASCII
}

Remove-Item $stagingRoot -Recurse -Force -ErrorAction SilentlyContinue
New-Item -ItemType Directory -Path $installersPath -Force | Out-Null

$licenseRtf = Join-Path $stagingRoot 'License.rtf'
New-Item -ItemType Directory -Path $stagingRoot -Force | Out-Null
Write-LicenseRtf -Path $licenseRtf

Write-Host 'Building...' -ForegroundColor Cyan

$staging = Join-Path $stagingRoot 'x64'

# Both halves go into one folder: each of them looks for the other beside
# itself — the tray menu opens the settings window, and the settings window
# registers the agent for startup
foreach ($half in @($agentProject, $settingsProject)) {
    Invoke-Tool -Path 'dotnet' -Arguments @(
        'publish', $half,
        '--configuration', 'Release',
        '--runtime', 'win-x64',
        '--self-contained', 'true',
        "-p:Version=$Version",
        '--output', $staging,
        '--nologo'
    )
}

# Debug symbols only make the download bigger; they are of no use to anyone
# who installs the application
Get-ChildItem $staging -Recurse -Filter '*.pdb' | Remove-Item -Force

$installer = Join-Path $installersPath "CursorLang-$Version-x64.msi"

Invoke-Tool -Path 'dotnet' -Arguments @(
    'build', $installerProject,
    '--configuration', 'Release',
    # The architecture of the package is the architecture of what goes in it:
    # a self-contained build fits nothing else
    '-p:InstallerPlatform=x64',
    # Handed over one by one rather than as a ready list of constants: a
    # semicolon in a property value is where MSBuild stops reading it. The
    # project gathers them into DefineConstants itself
    "-p:CursorLangVersion=$Version",
    "-p:PayloadDir=$staging",
    "-p:IconFile=$icon",
    "-p:LicenseFile=$licenseRtf",
    "-p:OutputPath=$installersPath\",
    "-p:OutputName=CursorLang-$Version-x64",
    '--nologo'
)

if ($Install) {
    Write-Host "Running $([System.IO.Path]::GetFileName($installer))..." -ForegroundColor Cyan

    # Started the way a user would, with the wizard showing: the point of -Install
    # is to see what the person on the other end sees
    Start-Process 'msiexec.exe' -ArgumentList '/i', "`"$installer`"" -Wait
}

Write-Host ''
Write-Host 'Done.' -ForegroundColor Green
Write-Host "  $installer"

Write-Host ''
Write-Host '  Nobody signed it, so Windows warns about an unknown publisher.'