param(
    [string]$Target
)

$ErrorActionPreference = "Stop"

Write-Host "===================================="
Write-Host " Unity CI Build (Windows Agent)"
Write-Host " Target: $Target"
Write-Host "===================================="

# -----------------------------
# Load toolchain config
# -----------------------------
$config = Get-Content ".\ci\toolchain.json" | ConvertFrom-Json

$unityVersion = $config.unityVersion
$unityRoot = $config.windows.unityRoot

$hubExe = "${env:ProgramFiles}\Unity Hub\Unity Hub.exe"

if (!(Test-Path $hubExe)) {
    throw "Unity Hub not found at: $hubExe"
}

# -----------------------------
# Ensure Unity is installed
# -----------------------------
$unityEditorPath = Join-Path $unityRoot "$unityVersion\Editor\Unity.exe"

if (!(Test-Path $unityEditorPath)) {

    Write-Host "Unity $unityVersion not found. Installing via Unity Hub..."

    # Install Unity Editor
    & $hubExe -- --headless install `
        --version $unityVersion 2>$null

    if ($LASTEXITCODE -ne 0) {
        throw "Failed to install Unity $unityVersion"
    }
}

Write-Host "Unity found: $unityEditorPath"

# -----------------------------
# Ensure required modules
# -----------------------------
# NOTE:
# Unity Hub CLI installs modules per version.
# These are cached per editor version, not reinstalled each build.

$modules = $config.windows.modules

Write-Host "Ensuring Unity modules: $($modules -join ', ')"

foreach ($module in $modules) {

    Write-Host "Checking module: $module"

    # Check installed modules via Unity Hub
    $installed = & $hubExe -- --headless editors --installed

    if ($installed -notmatch "$unityVersion.*$module") {

        Write-Host "Installing module: $module"

        & $hubExe -- --headless install-modules `
            --version $unityVersion `
            --module $module

        if ($LASTEXITCODE -ne 0) {
            throw "Failed to install module: $module"
        }
    }
    else {
        Write-Host "Module already installed: $module"
    }
}

# -----------------------------
# Resolve Unity build method
# -----------------------------
if(!$Target){
    Write-Host "No Target Provided"
    exit
}
$method = switch ($Target) {
    "Windows" { "BuildScript.Windows" }
    "Android" { "BuildScript.Android" }
}

Write-Host "Using Unity method: $method"

# -----------------------------
# Run Unity build
# -----------------------------
& $unityEditorPath `
    -batchmode `
    -nographics `
    -quit `
    -projectPath $PWD `
    -executeMethod $method `
    -logFile build-$Target.log

$exitCode = $LASTEXITCODE

# -----------------------------
# Validate result
# -----------------------------
if ($exitCode -ne 0) {
    throw "Unity build failed ($Target). Exit code: $exitCode"
}

Write-Host "===================================="
Write-Host " BUILD SUCCESS: $Target"
Write-Host "===================================="