# E01-S01: build the minimal native-mode C128 platform proof.
[CmdletBinding()]
param()

$ErrorActionPreference = "Stop"
$project = Split-Path $PSScriptRoot -Parent
$build = Join-Path $project "build"
$source = Join-Path $project "src\platform\minimal.s"
$config = Join-Path $project "cfg\minimal-c128.cfg"
$object = Join-Path $build "minimal.o"
$program = Join-Path $build "minimal.prg"
$map = Join-Path $build "minimal.map"
$labels = Join-Path $build "minimal.lbl"
$debug = Join-Path $build "minimal.dbg"

$ca65 = (Get-Command ca65 -ErrorAction Stop).Source
$ld65 = (Get-Command ld65 -ErrorAction Stop).Source

New-Item -ItemType Directory -Force -Path $build | Out-Null

foreach ($path in @($object, $program, $map, $labels, $debug)) {
    if (Test-Path -LiteralPath $path) {
        Remove-Item -LiteralPath $path -Force
    }
}

& $ca65 --cpu 6502 --debug-info -o $object $source
if ($LASTEXITCODE -ne 0) { throw "ca65 failed with exit code $LASTEXITCODE" }

& $ld65 -C $config -o $program -m $map -Ln $labels --dbgfile $debug $object
if ($LASTEXITCODE -ne 0) { throw "ld65 failed with exit code $LASTEXITCODE" }

$bytes = [IO.File]::ReadAllBytes($program)
if ($bytes.Length -lt 16) { throw "minimal.prg is unexpectedly short" }
if ($bytes[0] -ne 0x01 -or $bytes[1] -ne 0x1C) {
    throw "minimal.prg load address is not `$1C01"
}

# The first BASIC line must be SYS 7181, whose target is $1C0D.
$expectedHeader = [byte[]](0x0B,0x1C,0x0A,0x00,0x9E,0x37,0x31,0x38,0x31,0x00,0x00,0x00)
for ($i = 0; $i -lt $expectedHeader.Length; $i++) {
    if ($bytes[$i + 2] -ne $expectedHeader[$i]) {
        throw ("BASIC header differs at file offset {0}: expected {1:X2}, got {2:X2}" -f
            ($i + 2), $expectedHeader[$i], $bytes[$i + 2])
    }
}

$labelText = Get-Content -Raw -LiteralPath $labels
$expectedLabels = @{
    minimal_entry  = "001C0D"
    minimal_done   = "001C24"
    minimal_result = "001C3E"
}
foreach ($item in $expectedLabels.GetEnumerator()) {
    $pattern = "(?im)^al\s+" + $item.Value + "\s+\." + [regex]::Escape($item.Key) + "\s*$"
    if ($labelText -notmatch $pattern) {
        throw ("linker label {0} did not resolve to `${1}" -f $item.Key, $item.Value.Substring(2))
    }
}

Write-Host ("built {0} ({1} bytes)" -f $program, $bytes.Length)
Write-Host ("map   {0}" -f $map)
Write-Host ("labels {0}" -f $labels)