# E07-S01 integration checks for scripts/prepare-disk.ps1.
[CmdletBinding()]
param()

$ErrorActionPreference = "Stop"

$project = Split-Path (Split-Path $PSScriptRoot -Parent) -Parent
$repository = Split-Path $project -Parent
$prepare = Join-Path $project "scripts\prepare-disk.ps1"
$buildMinimal = Join-Path $project "scripts\build-minimal.ps1"
$source = Join-Path $repository "vim\work.d81"
$c1541 = "C:\Program Files\GTK3VICE-3.10-win64\bin\c1541.exe"
$testRoot = Join-Path $project "build\disk-test"
$output = Join-Path $testRoot "newlang-test.d81"
$examples = Join-Path $testRoot "examples"
$testCompiler = Join-Path $testRoot "n128c-test.prg"
$missing = Join-Path $testRoot "missing"

if (-not (Test-Path -LiteralPath $prepare -PathType Leaf)) {
    throw "prepare-disk.ps1 not found"
}
if (-not (Test-Path -LiteralPath $source -PathType Leaf)) {
    throw "test source D81 not found: $source"
}
if (-not (Test-Path -LiteralPath $c1541 -PathType Leaf)) {
    throw "test c1541 not found: $c1541"
}

New-Item -ItemType Directory -Force -Path $examples | Out-Null
[IO.File]::WriteAllText((Join-Path $examples "demo.n8"),
    "program Main`n  print `"Nova128`"`nend program`n",
    [Text.UTF8Encoding]::new($false))

# E01-S01 is this story's completed dependency and provides a known-good PRG.
& $buildMinimal | Out-Host
$minimal = Join-Path $project "build\minimal.prg"
Copy-Item -LiteralPath $minimal -Destination $testCompiler -Force

$sourceHashBefore = (Get-FileHash -LiteralPath $source -Algorithm SHA256).Hash

$first = & $prepare -SourceImage $source -OutputImage $output -C1541Path $c1541 `
    -CompilerPrg $testCompiler -ProbePrg $minimal -ExamplesDirectory $examples `
    -RequireCompiler
if (-not (Test-Path -LiteralPath $output -PathType Leaf)) {
    throw "prepare-disk did not create the disposable image"
}
$firstHash = (Get-FileHash -LiteralPath $output -Algorithm SHA256).Hash
$listing = (& $c1541 $output -list 2>&1) -join "`n"
foreach ($expected in @(
        '(?im)"n128c"\s+prg\s*$',
        '(?im)"n128probe"\s+prg\s*$',
        '(?im)"demo\.n8"\s+seq\s*$')) {
    if ($listing -notmatch $expected) {
        throw "prepared directory lacks expected entry $expected`n$listing"
    }
}

# Damage only the generated output, then prove a rebuild returns to the exact
# same bytes from the clean source image.
[IO.File]::WriteAllBytes($output, [byte[]](1, 2, 3, 4))
$second = & $prepare -SourceImage $source -OutputImage $output -C1541Path $c1541 `
    -CompilerPrg $testCompiler -ProbePrg $minimal -ExamplesDirectory $examples `
    -RequireCompiler
$secondHash = (Get-FileHash -LiteralPath $output -Algorithm SHA256).Hash
if ($firstHash -ne $secondHash) {
    throw "two clean prepares produced different D81 hashes"
}

$sourceHashAfter = (Get-FileHash -LiteralPath $source -Algorithm SHA256).Hash
if ($sourceHashAfter -ne $sourceHashBefore) {
    throw "source D81 hash changed during prepare test"
}

# Optional, not-yet-built artifacts must be skipped without preventing a clean
# copy. This deliberately uses absent compiler, probe, and examples paths.
$optionalOutput = Join-Path $testRoot "optional-only.d81"
$optional = & $prepare -SourceImage $source -OutputImage $optionalOutput `
    -C1541Path $c1541 -CompilerPrg (Join-Path $missing "n128c.prg") `
    -ProbePrg (Join-Path $missing "probe.prg") `
    -ExamplesDirectory (Join-Path $missing "examples") 3>&1
if (-not (Test-Path -LiteralPath $optionalOutput -PathType Leaf)) {
    throw "missing optional artifacts prevented creation of the copied D81"
}

function Assert-FailsWith {
    param(
        [Parameter(Mandatory = $true)][scriptblock]$Action,
        [Parameter(Mandatory = $true)][string]$Pattern
    )
    $caught = $null
    try {
        & $Action
    } catch {
        $caught = $_.Exception.Message
    }
    if ($null -eq $caught) {
        throw "expected failure matching '$Pattern', but the command succeeded"
    }
    if ($caught -notmatch $Pattern) {
        throw "failure '$caught' did not match '$Pattern'"
    }
}

Assert-FailsWith -Pattern 'source D81 not found' -Action {
    & $prepare -SourceImage (Join-Path $missing "work.d81") `
        -OutputImage (Join-Path $testRoot "never-source.d81") `
        -C1541Path $c1541
}
Assert-FailsWith -Pattern 'c1541 tool not found' -Action {
    & $prepare -SourceImage $source `
        -OutputImage (Join-Path $testRoot "never-tool.d81") `
        -C1541Path (Join-Path $missing "c1541.exe")
}
Assert-FailsWith -Pattern 'must not be the source' -Action {
    & $prepare -SourceImage $source -OutputImage $source -C1541Path $c1541
}

Write-Host "prepare-disk tests passed"
Write-Host "source SHA-256 unchanged: $sourceHashAfter"
Write-Host "deterministic output SHA-256: $secondHash"
Write-Host "directory entries verified: n128c, n128probe, demo.n8"