#Requires -Version 5.1
<#
.SYNOPSIS
    Build roadamp.exe

.PARAMETER OutDir
    Output directory. Defaults to the project root (where this script lives).

.PARAMETER Version
    Version string embedded via -ldflags. Defaults to the current git tag/commit.

.EXAMPLE
    .\build.ps1
    .\build.ps1 -OutDir C:\Deploy\roadamp
#>
param(
    [string]$OutDir  = $PSScriptRoot,
    [string]$Version = ""
)

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

Push-Location $PSScriptRoot
try {
    # Resolve version from git if not supplied
    if (-not $Version) {
        $tag    = git describe --tags --always --dirty 2>$null
        $Version = if ($tag) { $tag } else { "dev" }
    }

    $out = Join-Path $OutDir "roadamp.exe"

    Write-Host "Building roadamp $Version -> $out" -ForegroundColor Cyan

    # ── Patch sw.js with build version ────────────────────────────────────────
    # The service worker embeds a cache-bust token so installed PWA clients
    # pick up new assets after each release. We replace __BUILDVER__ in the
    # source file, run go build (which embeds it), then restore via git.
    $swPath = Join-Path $PSScriptRoot 'web\static\sw.js'
    $swOriginal = Get-Content $swPath -Raw
    try {
        $swPatched = $swOriginal -replace '__BUILDVER__', $Version
        [System.IO.File]::WriteAllText($swPath, $swPatched, [System.Text.Encoding]::UTF8)

        # ── Compile ───────────────────────────────────────────────────────────
        $env:GOOS        = "windows"
        $env:GOARCH      = "amd64"
        $env:CGO_ENABLED = "0"

        go build `
            -trimpath `
            -ldflags "-s -w -X main.Version=$Version" `
            -o $out `
            ./cmd/roadamp
    }
    finally {
        # Always restore sw.js so the template token is preserved in the repo.
        [System.IO.File]::WriteAllText($swPath, $swOriginal, [System.Text.Encoding]::UTF8)
    }

    $size = [math]::Round((Get-Item $out).Length / 1MB, 2)
    Write-Host "Done  $out  (${size} MB)" -ForegroundColor Green
}
finally {
    Pop-Location
}