# E04-S03: run the scalar emitter fixture, check results, capture golden bytes,
# disassemble them with da65, and compare committed expectations when present.
[CmdletBinding()]
param(
    [int]$Port = 6530,
    [int]$TimeoutSeconds = 90
)

$ErrorActionPreference = "Stop"
$project = Split-Path $PSScriptRoot -Parent
Import-Module (Join-Path $PSScriptRoot "lib\Nova128Test.psm1") -Force
& (Join-Path $PSScriptRoot "build-scalar-test.ps1")

$out = Join-Path $project "build\scalar-test"
$prg = Join-Path $out "scalar-test.prg"
$labels = Join-Path $out "scalar-test.lbl"
$session = Start-Nova128X128 -Autostart $prg -Port $Port `
    -Screenshot (Join-Path $out "scalar-test-vicii.png")
try {
    $mb = Wait-Nova128Mailbox $session -TimeoutSeconds $TimeoutSeconds
    $lenAddr = Get-Nova128Label -Labels $labels -Name "golden_len"
    $copyAddr = Get-Nova128Label -Labels $labels -Name "golden_copy"
    $lenBytes = Read-Nova128Memory -Session $session -Address $lenAddr -Count 1
    $goldenLen = [int]$lenBytes[0]
    if ($goldenLen -eq 0) { throw "golden_len is zero" }
    $golden = Read-Nova128Memory -Session $session -Address $copyAddr -Count $goldenLen
} finally {
    Stop-Nova128X128 $session
}

Write-Host ('mailbox: ' + (($mb | ForEach-Object { $_.ToString('X2') }) -join ' '))
Write-Host ("results: byte={0:X2} cmp={1:X2} add={2:X2}{3:X2} sub={4:X2}{5:X2} mul={6:X2} fault={7}" -f `
    $mb[8], $mb[9], $mb[11], $mb[10], $mb[13], $mb[12], $mb[14], $mb[15])

$failures = @()
if ($mb[2] -ne 0x03) { $failures += "producer $($mb[2]) is not a generated program" }
if ($mb[3] -ne 0xA5) { $failures += "fixture status is not PASS" }
if ($mb[4] -ne 0 -or $mb[5] -ne 0) { $failures += "code is $($mb[4] + 256 * $mb[5])" }
$want = [ordered]@{
    byte = 0x5A
    cmp = 0x0E
    addLow = 0x21; addHigh = 0x22
    subLow = 0xBB; subHigh = 0xEC
    mulLow = 0xE0
    fault = 1
}
if ($mb[8] -ne $want.byte) { $failures += ('byte assignment is {0:X2}, expected {1:X2}' -f $mb[8], $want.byte) }
if ($mb[9] -ne $want.cmp) { $failures += ('comparisons are {0:X2}, expected {1:X2}' -f $mb[9], $want.cmp) }
if ($mb[10] -ne $want.addLow -or $mb[11] -ne $want.addHigh) {
    $failures += ('add is {0:X2}{1:X2}, expected {2:X2}{3:X2}' -f $mb[11], $mb[10], $want.addHigh, $want.addLow)
}
if ($mb[12] -ne $want.subLow -or $mb[13] -ne $want.subHigh) {
    $failures += ('sub is {0:X2}{1:X2}, expected {2:X2}{3:X2}' -f $mb[13], $mb[12], $want.subHigh, $want.subLow)
}
if ($mb[14] -ne $want.mulLow) { $failures += ('mul low is {0:X2}, expected {1:X2}' -f $mb[14], $want.mulLow) }
if ($mb[15] -ne $want.fault) { $failures += "fault byte is $($mb[15]), expected 1" }

$binPath = Join-Path $out "scalar.golden.bin"
[IO.File]::WriteAllBytes($binPath, $golden)
$disPath = Join-Path $out "scalar.golden.dis"
$da65 = (Get-Command da65 -ErrorAction Stop).Source
& $da65 --cpu 6502 --start-addr 0000 -o $disPath $binPath 2>&1 | Out-Null
if ($LASTEXITCODE -ne 0) { throw "da65 failed on $binPath" }
# Remove da65's timestamp/path header so the committed listing is stable.
$disLines = Get-Content -LiteralPath $disPath | Where-Object {
    $_.Trim() -ne "" -and -not $_.StartsWith(";")
}
[IO.File]::WriteAllText($disPath, (($disLines -join "`n") + "`n"))

$hex = (($golden | ForEach-Object { $_.ToString("X2") }) -join " ") + "`n"
$actualHex = Join-Path $out "scalar.golden.hex"
[IO.File]::WriteAllText($actualHex, $hex)
Write-Host "golden bytes: $goldenLen"
Write-Host "hex: $actualHex"
Write-Host "disassembly: $disPath"

$expectedHexPath = Join-Path $project "tests\codegen\scalar.expected.hex"
if (Test-Path -LiteralPath $expectedHexPath) {
    $expectedHex = ([IO.File]::ReadAllText($expectedHexPath)).Trim()
    if ($hex.Trim() -ne $expectedHex) {
        $failures += "golden bytes differ from tests/codegen/scalar.expected.hex"
    }
} else {
    Write-Host "no tests/codegen/scalar.expected.hex yet"
}

$expectedDisPath = Join-Path $project "tests\codegen\scalar.expected.dis"
if (Test-Path -LiteralPath $expectedDisPath) {
    $expectedDis = ([IO.File]::ReadAllText($expectedDisPath)).Replace("`r`n", "`n").TrimEnd()
    $actualDis = ([IO.File]::ReadAllText($disPath)).Replace("`r`n", "`n").TrimEnd()
    if ($actualDis -ne $expectedDis) {
        $failures += "golden disassembly differs from tests/codegen/scalar.expected.dis"
    }
} else {
    Write-Host "no tests/codegen/scalar.expected.dis yet"
}

if ($failures) { throw ("scalar verification failed:`n  " + ($failures -join "`n  ")) }
Write-Host "verified scalar assignments, comparisons, short-circuit, arithmetic, and divide-by-zero"