# Rebuild (optional) and refresh firmware/cyd_28r from PlatformIO build output.
# Usage:
#   .\firmware\export_from_build.ps1
#   .\firmware\export_from_build.ps1 -SkipBuild

param([switch]$SkipBuild)

$ErrorActionPreference = "Stop"
$root = Split-Path -Parent (Split-Path -Parent $MyInvocation.MyCommand.Path)
Set-Location $root

if (-not $SkipBuild) {
  pio run -e cyd_28r
  if ($LASTEXITCODE -ne 0) { exit $LASTEXITCODE }
}

$src = Join-Path $root ".pio\build\cyd_28r"
$dst = Join-Path $root "firmware\cyd_28r"
New-Item -ItemType Directory -Force -Path $dst | Out-Null

Copy-Item (Join-Path $src "bootloader.bin") $dst -Force
Copy-Item (Join-Path $src "partitions.bin") $dst -Force
Copy-Item (Join-Path $src "firmware.bin") $dst -Force

$bootApp = Join-Path $env:USERPROFILE ".platformio\packages\framework-arduinoespressif32\tools\partitions\boot_app0.bin"
if (-not (Test-Path $bootApp)) {
  Write-Error "boot_app0.bin not found under PlatformIO packages"
}
Copy-Item $bootApp (Join-Path $dst "boot_app0.bin") -Force

$git = "nogit"
try {
  $git = (git -C $root rev-parse --short HEAD 2>$null).Trim()
  if (-not $git) { $git = "nogit" }
} catch { $git = "nogit" }

$date = Get-Date -Format "yyyy-MM-dd"
$hashes = Get-FileHash (Join-Path $dst "*.bin") -Algorithm SHA256
$lines = @(
  "name: CYD SGP30 air quality dashboard (cyd_28r)",
  "git: $git",
  "date: $date",
  "board: ESP32-2432S028R (ILI9341)",
  "sgp30: SDA=GPIO22 SCL=GPIO27",
  "flash_size: 4MB",
  "offsets:",
  "  0x1000  bootloader.bin",
  "  0x8000  partitions.bin",
  "  0xe000  boot_app0.bin",
  "  0x10000 firmware.bin",
  "sha256:"
)
foreach ($h in $hashes) {
  $lines += ("  {0,-15} {1}" -f (Split-Path $h.Path -Leaf), $h.Hash)
}
$lines | Set-Content -Encoding utf8 (Join-Path $dst "VERSION.txt")
Write-Host "Exported -> $dst (git $git)"