# E01-S04: build the independent C128 display/clock probe.
[CmdletBinding()]
param()

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

# VDC register access would make semantic storage/display behavior ambiguous.
$sourceText = Get-Content -Raw -LiteralPath $source
$codeOnly = ($sourceText -split "`n" | ForEach-Object {
    ($_ -split ';', 2)[0]
}) -join "`n"
if ($codeOnly -match '(?i)\$D60[01]') {
    throw "display/clock probe must not access VDC address/data registers"
}

& $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 ($bytes.Length -lt 16) { throw "display-clock.prg is unexpectedly short" }
if ($bytes[0] -ne 0x01 -or $bytes[1] -ne 0x1C) {
    throw "display-clock.prg load address is not `$1C01"
}

$labelText = Get-Content -Raw -LiteralPath $labels
$expectedLabels = @{
    display_clock_entry = '001C0D'
    mode_40_checkpoint  = '001C2E'
    mode_80_checkpoint  = '001C3D'
    fast_checkpoint     = '001C49'
    fallback_done       = '001C8C'
    display_result      = '001D0F'
    mode_observed       = '001D10'
    fast_observed       = '001D11'
    final_clock         = '001D12'
    semantic_a          = '001D13'
    semantic_b          = '001D14'
}
foreach ($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)