# E01-S05: prove cfg/compiler.cfg capacity checks, then run the map skeleton
# in VICE x128 and verify the fixed test mailbox at $1BF0.
[CmdletBinding()]
param(
    [int]$RemotePort = 6513,
    [int]$TimeoutSeconds = 30
)

$ErrorActionPreference = "Stop"
$project = Split-Path $PSScriptRoot -Parent
$build = Join-Path $project "build"
$program = Join-Path $build "map-skeleton.prg"
$screenshot = Join-Path $build "map-skeleton-vicii.png"
$x128 = "C:\Program Files\GTK3VICE-3.10-win64\bin\x128.exe"
$mailbox = 0x1BF0

# 1. Every bounded region must reject an overflow at link time.
foreach ($region in "ZP", "COMMON", "MAIN", "SWSTACK", "TABLES") {
    & (Join-Path $PSScriptRoot "build-map-skeleton.ps1") -Overflow $region
}

# 2. The real skeleton.
& (Join-Path $PSScriptRoot "build-map-skeleton.ps1")
if (-not (Test-Path -LiteralPath $x128)) { throw "x128.exe not found at $x128" }
if (Test-Path -LiteralPath $screenshot) { Remove-Item -LiteralPath $screenshot -Force }

$arguments = @(
    "-autostart", ('"' + $program + '"'),
    "-autostart-warp", "-warp", "-sounddev", "dummy",
    "-exitscreenshotvicii", ('"' + $screenshot + '"'),
    "-remotemonitor", "-remotemonitoraddress", ("ip4://127.0.0.1:{0}" -f $RemotePort)
) -join ' '
$psi = [Diagnostics.ProcessStartInfo]::new()
$psi.FileName = $x128
$psi.Arguments = $arguments
$psi.UseShellExecute = $true
$psi.WindowStyle = [Diagnostics.ProcessWindowStyle]::Hidden
$process = [Diagnostics.Process]::Start($psi)
$client = $null

function Read-Available($stream) {
    $buffer = New-Object byte[] 16384
    $text = ""
    Start-Sleep -Milliseconds 300
    while ($stream.DataAvailable) {
        $count = $stream.Read($buffer, 0, $buffer.Length)
        if ($count -le 0) { break }
        $text += [Text.Encoding]::ASCII.GetString($buffer, 0, $count)
        Start-Sleep -Milliseconds 50
    }
    return $text
}

function Convert-Dump([string]$text) {
    $memory = @{}
    $rows = [regex]::Matches($text, "(?i)C:([0-9a-f]{4})((?:[ ]{1,2}[0-9a-f]{2}){1,16})")
    foreach ($row in $rows) {
        $address = [Convert]::ToInt32($row.Groups[1].Value, 16)
        foreach ($hex in ($row.Groups[2].Value.Trim() -split '\s+')) {
            $memory[$address] = [Convert]::ToInt32($hex, 16)
            $address++
        }
    }
    return $memory
}

try {
    $deadline = [DateTime]::UtcNow.AddSeconds(10)
    while ([DateTime]::UtcNow -lt $deadline) {
        if ($process.HasExited) { throw "x128 exited before remote verification" }
        try {
            $client = [Net.Sockets.TcpClient]::new()
            $client.Connect("127.0.0.1", $RemotePort)
            break
        } catch {
            if ($client) { $client.Dispose(); $client = $null }
            Start-Sleep -Milliseconds 200
        }
    }
    if (-not $client -or -not $client.Connected) { throw "could not connect to VICE remote monitor" }

    $stream = $client.GetStream()
    $writer = [IO.StreamWriter]::new($stream, [Text.Encoding]::ASCII, 1024, $true)
    $writer.NewLine = "`n"
    $writer.AutoFlush = $true

    # Mailbox protocol: magic "N8", then status leaves RUNNING ($01).
    $memory = @{}
    $deadline = [DateTime]::UtcNow.AddSeconds($TimeoutSeconds)
    while ($true) {
        Start-Sleep -Seconds 1
        $writer.WriteLine(("m `${0:X4} `${1:X4}" -f $mailbox, ($mailbox + 15)))
        $chunk = Read-Available $stream
        $memory = Convert-Dump $chunk
        $magic = ($memory[$mailbox] -eq 0x4E -and $memory[$mailbox + 1] -eq 0x38)
        if ($magic -and $memory[$mailbox + 3] -in 0xA5, 0xFA) { break }
        if ([DateTime]::UtcNow -ge $deadline) {
            throw "mailbox never reached a final status; last response: $chunk"
        }
        $writer.WriteLine("x")
        Read-Available $stream | Out-Null
    }
    $writer.WriteLine("x")
    Start-Sleep -Seconds 2                     # let the OK line print
    $writer.WriteLine("m 0000 0000")
    Read-Available $stream | Out-Null

    $bytes = 0..15 | ForEach-Object { "{0:X2}" -f $memory[$mailbox + $_] }
    $code = $memory[$mailbox + 4] + 256 * $memory[$mailbox + 5]
    $writer.WriteLine("quit")
    $writer.Dispose(); $client.Dispose(); $client = $null
    if (-not $process.WaitForExit(10000)) { throw "x128 did not exit after monitor quit" }

    Write-Host ("mailbox `$1BF0: {0}" -f ($bytes -join ' '))
    $checks = @(@(0x01, "ZP"), @(0x02, "KCALL"), @(0x04, "BANK1"), @(0x08, "NMI"),
        @(0x10, "COMMON"), @(0x20, "RESTORE"))
    $failed = @($checks | Where-Object { $code -band $_[0] } | ForEach-Object { $_[1] })
    if ($memory[$mailbox + 2] -ne 0x01) { throw "producer is not the platform skeleton" }
    if ($memory[$mailbox + 3] -ne 0xA5 -or $code -ne 0) {
        throw ("skeleton FAILED checks: {0} (code `${1:X4})" -f ($failed -join ', '), $code)
    }
    $nmis = $memory[$mailbox + 8]
    if ($nmis -lt 1) { throw "no NMI was counted" }
    Write-Host ("verified mailbox PASS, code `$0000, {0} NMI(s) under CR `${1:X2} / P0 page `${2:X2}, ZP sentinel `${3:X2}" -f
        $nmis, $memory[$mailbox + 9], $memory[$mailbox + 10], $memory[$mailbox + 11])
    if (Test-Path -LiteralPath $screenshot) { Write-Host ("screenshot: {0}" -f $screenshot) }
} finally {
    if ($client) { $client.Dispose() }
    if ($process -and -not $process.HasExited) { $process.Kill(); $process.WaitForExit() }
}