param(
    [Parameter(Mandatory=$true)]
    [string]$PackagePath,
    [string]$WorkDir = ""
)

$ErrorActionPreference = "Stop"
Set-StrictMode -Version Latest

function ConvertTo-Sha256Hex([string]$Text) {
    $bytes = [System.Text.Encoding]::UTF8.GetBytes($Text)
    $sha = [System.Security.Cryptography.SHA256]::Create()
    try {
        return -join ($sha.ComputeHash($bytes) | ForEach-Object { $_.ToString("x2") })
    }
    finally {
        $sha.Dispose()
    }
}

function Read-FirstJsonLine([string]$Path) {
    if (-not (Test-Path -LiteralPath $Path)) {
        return $null
    }
    foreach ($line in Get-Content -LiteralPath $Path) {
        $trimmed = $line.Trim()
        if ($trimmed.StartsWith("{") -and $trimmed.EndsWith("}")) {
            return ($trimmed | ConvertFrom-Json)
        }
    }
    return $null
}

function Test-NonEmptyString($Value) {
    if ($null -eq $Value) {
        return $false
    }
    return -not [string]::IsNullOrWhiteSpace([string]$Value)
}

if (-not (Test-Path -LiteralPath $PackagePath)) {
    throw "package not found: $PackagePath"
}

$resolvedPackage = (Resolve-Path -LiteralPath $PackagePath).Path
$cleanup = $false
if ([string]::IsNullOrWhiteSpace($WorkDir)) {
    $WorkDir = Join-Path ([System.IO.Path]::GetTempPath()) ("isphere-returned-send-sandbox-" + [guid]::NewGuid().ToString("N"))
    $cleanup = $true
}

if (Test-Path -LiteralPath $WorkDir) {
    Remove-Item -LiteralPath $WorkDir -Recurse -Force
}
New-Item -ItemType Directory -Force -Path $WorkDir | Out-Null

try {
    if ($resolvedPackage.EndsWith(".zip", [System.StringComparison]::OrdinalIgnoreCase)) {
        Expand-Archive -LiteralPath $resolvedPackage -DestinationPath $WorkDir -Force
        $root = $WorkDir
    }
    else {
        $root = $resolvedPackage
    }

    $allFiles = Get-ChildItem -LiteralPath $root -Recurse -File
    $inputsFile = $allFiles | Where-Object { $_.Name -like "SANDBOX-SEND-INPUTS*.json" } | Sort-Object FullName | Select-Object -First 1
    if (-not $inputsFile) {
        throw "missing SANDBOX-SEND-INPUTS json"
    }
    $inputs = Get-Content -LiteralPath $inputsFile.FullName -Raw | ConvertFrom-Json

    $capabilityLog = $allFiles | Where-Object { $_.Name -like "*capability-test*.txt" -or $_.Name -like "*capability*.log" } | Sort-Object FullName | Select-Object -First 1
    $capability = $null
    if ($capabilityLog) {
        $capability = Read-FirstJsonLine $capabilityLog.FullName
    }

    $liveProbeZips = @($allFiles | Where-Object { $_.Name -like "isphere-live-probe-*.zip" })
    $beforeMarkers = @($allFiles | Where-Object { $_.FullName -match "\\before\\" -or $_.FullName -match "/before/" -or $_.Name -like "*before*" })
    $afterMarkers = @($allFiles | Where-Object { $_.FullName -match "\\after\\" -or $_.FullName -match "/after/" -or $_.Name -like "*after*" })

    $contentText = [string]$inputs.content_text_to_send
    $expectedHash = [string]$inputs.content_sha256
    $actualHash = ConvertTo-Sha256Hex $contentText
    $contentHashMatches = ($actualHash -eq $expectedHash)

    $capabilityOK = $false
    $capabilityToolCount = 0
    $productionSendEnabled = $false
    if ($null -ne $capability) {
        $capabilityOK = ($capability.ok -eq $true)
        if ($null -ne $capability.tool_count) {
            $capabilityToolCount = [int]$capability.tool_count
        }
        if ($null -ne $capability.production_send_enabled) {
            $productionSendEnabled = [bool]$capability.production_send_enabled
        }
    }

    $hasExplicitTarget = (Test-NonEmptyString $inputs.sandbox_target_type) -and (Test-NonEmptyString $inputs.sandbox_target_id)
    $hasIdempotencyKey = Test-NonEmptyString $inputs.idempotency_key
    $hasSuccessRecord = Test-NonEmptyString $inputs.success_ack_or_sent_record
    $manualStartPresent = Test-NonEmptyString $inputs.manual_send_started_at_local
    $manualFinishPresent = Test-NonEmptyString $inputs.manual_send_finished_at_local
    $operatorSuccess = ($inputs.operator_observed_success -eq $true)
    $noSecondSend = ($inputs.do_not_send_second_time_confirmed -eq $true)
    $hasBeforeProbe = ($liveProbeZips.Count -gt 0 -or $beforeMarkers.Count -gt 0)
    $hasAfterProbe = ($afterMarkers.Count -gt 0)

    $partialUsable = (
        $capabilityOK -and
        $capabilityToolCount -eq 9 -and
        -not $productionSendEnabled -and
        $hasExplicitTarget -and
        $contentHashMatches -and
        $hasIdempotencyKey -and
        $operatorSuccess -and
        $hasSuccessRecord -and
        $noSecondSend -and
        $hasBeforeProbe
    )

    $r6dGatePass = (
        $partialUsable -and
        $manualStartPresent -and
        $manualFinishPresent -and
        $hasAfterProbe
    )

    $missing = New-Object System.Collections.Generic.List[string]
    if (-not $manualStartPresent) { $missing.Add("manual_send_started_at_local") }
    if (-not $manualFinishPresent) { $missing.Add("manual_send_finished_at_local") }
    if (-not $hasAfterProbe) { $missing.Add("after_recorder_output") }

    [ordered]@{
        ok = $true
        package = $resolvedPackage
        input_file_name = $inputsFile.Name
        partial_evidence_usable = $partialUsable
        r6d_gate_pass = $r6dGatePass
        target_type_present = Test-NonEmptyString $inputs.sandbox_target_type
        target_id_present = Test-NonEmptyString $inputs.sandbox_target_id
        content_hash_matches = $contentHashMatches
        idempotency_key_present = $hasIdempotencyKey
        operator_observed_success = $operatorSuccess
        success_ack_or_sent_record_present = $hasSuccessRecord
        do_not_send_second_time_confirmed = $noSecondSend
        manual_send_started_at_local_present = $manualStartPresent
        manual_send_finished_at_local_present = $manualFinishPresent
        capability_test_ok = $capabilityOK
        capability_tool_count = $capabilityToolCount
        production_send_enabled = $productionSendEnabled
        has_before_probe = $hasBeforeProbe
        has_after_probe = $hasAfterProbe
        live_probe_zip_count = $liveProbeZips.Count
        missing_for_full_gate = @($missing)
        decision = if ($r6dGatePass) { "full_gate_pass" } elseif ($partialUsable) { "partial_use_only" } else { "not_usable" }
    } | ConvertTo-Json -Depth 6 -Compress
}
finally {
    if ($cleanup -and (Test-Path -LiteralPath $WorkDir)) {
        Remove-Item -LiteralPath $WorkDir -Recurse -Force
    }
}