param(
    [string]$OutputDir = "runs/offline-broute-reverse",
    [string]$ReportPath = "docs/source-discovery/2026-07-12-offline-broute-reverse-index.md"
)

$ErrorActionPreference = "Stop"

$repo = (Resolve-Path -LiteralPath (Join-Path $PSScriptRoot "..")).Path
$outDir = Join-Path $repo $OutputDir
$reportFullPath = Join-Path $repo $ReportPath
New-Item -ItemType Directory -Force -Path $outDir | Out-Null
New-Item -ItemType Directory -Force -Path (Split-Path -Parent $reportFullPath) | Out-Null

$samples = @(
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/IMPlatformClient.exe"
        role = "main managed client; text send, chat window, plugin/IPC candidates"
        expected_sha256 = "E2966E58360DAEEBF178410A961E2DC52748C63E9CCBD94BD6EC8434A1A09CB7"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/IMPP.Service.dll"
        role = "file upload service candidates"
        expected_sha256 = "F859DE2F34E024B5F372D95F22CBF8A018C780F24203E7A76D392E52BD90CADD"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/IMPP.Interface.dll"
        role = "service/interface contract candidates"
        expected_sha256 = "DD093CF61FAE85C2D2581F289B01AA477546712E098FEF81272FDD989E50D12D"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/IMPP.Model.dll"
        role = "model/parameter types"
        expected_sha256 = "7CBABDD23A7234D15E294C549EEEC78EFBAD6E957CD45A6E8A85309349A624A5"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/IMPP.UI.dll"
        role = "UI/plugin helpers and possible send controls"
        expected_sha256 = "4C61212519C01D1B731ED4F20DF3411C491616F4ADA98A4529722A6AA3689E6D"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/IMPP.Common.dll"
        role = "shared utility and message types"
        expected_sha256 = "02A47C99C27C9BFE2BADC438389300C92220B07609BD87C48B4B5E1B4EE6AEB4"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/IMPP.Helper.dll"
        role = "helper abstractions"
        expected_sha256 = "30932D082B6678699C832C63F923E01EAD84674FAEDB613D631E034E03742FB9"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/smack.dll"
        role = "XMPP chat/send layer"
        expected_sha256 = "BAD0BB0591765DB153B17CECC1112B0BBDBF3B1D3370DDF973F91974E92CEC66"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/TcpFileTransfer.dll"
        role = "native/transfer candidate"
        expected_sha256 = "6C4874B46D1E7DC04C9B6784180603452400B881E04509D464A0D58814EFEDA7"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/HttpServerLib.dll"
        role = "local API/IPC candidate"
        expected_sha256 = "FFDB633216AE332B8EDFFC83E2AE546B7A80144C659FF4053FDFE4FE382A8D12"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/INetwork.dll"
        role = "network abstraction candidate"
        expected_sha256 = "E40BE4EE2439E4280461F4D2BADB318A5F4572428F069AB6D17B4C4F0E8CFAC9"
    },
    @{
        path = "runs/offline-real-client-window/full/zyl/Impp/IOClientNetwork.dll"
        role = "network implementation candidate"
        expected_sha256 = "64CA231A614771325741A5F098E52EBF20F7190E339B64962DE2EDEDCFFFF904"
    }
)

$entries = foreach ($sample in $samples) {
    $fullPath = Join-Path $repo $sample.path
    $exists = Test-Path -LiteralPath $fullPath -PathType Leaf
    $item = $null
    $sha256 = ""
    $matches = $false
    if ($exists) {
        $item = Get-Item -LiteralPath $fullPath
        $sha256 = (Get-FileHash -LiteralPath $fullPath -Algorithm SHA256).Hash.ToUpperInvariant()
        $matches = ($sha256 -eq $sample.expected_sha256)
    }
    [pscustomobject]@{
        path = $sample.path
        file_name = Split-Path -Leaf $sample.path
        role = $sample.role
        exists = $exists
        size_bytes = if ($item) { $item.Length } else { $null }
        last_write_time = if ($item) { $item.LastWriteTime.ToString("o") } else { $null }
        sha256 = $sha256
        expected_sha256 = $sample.expected_sha256
        sha256_matches_expected = $matches
    }
}

$summary = [pscustomobject]@{
    generated_at = (Get-Date).ToUniversalTime().ToString("o")
    repository = $repo
    output_dir = $OutputDir
    samples_total = @($entries).Count
    samples_present = @($entries | Where-Object { $_.exists }).Count
    hash_matches = @($entries | Where-Object { $_.sha256_matches_expected }).Count
    originals_copied = $false
    originals_modified = $false
    entries = $entries
}

$jsonPath = Join-Path $outDir "index.json"
$summary | ConvertTo-Json -Depth 8 | Set-Content -LiteralPath $jsonPath -Encoding UTF8

$lines = New-Object System.Collections.Generic.List[string]
$lines.Add("# Offline B-Route Reverse Index")
$lines.Add("")
$lines.Add("Date: 2026-07-12")
$lines.Add("")
$lines.Add("## Scope")
$lines.Add("")
$lines.Add("This index records the read-only offline samples for B-route reverse engineering. The script reads metadata and SHA256 hashes only; it does not copy or modify the original binaries.")
$lines.Add("")
$lines.Add("## Summary")
$lines.Add("")
$lines.Add("- Samples total: $($summary.samples_total)")
$lines.Add("- Samples present: $($summary.samples_present)")
$lines.Add("- Hash matches: $($summary.hash_matches)")
$lines.Add("- Originals copied: false")
$lines.Add("- Originals modified: false")
$lines.Add("- Machine JSON: ``$OutputDir/index.json``")
$lines.Add("")
$lines.Add("## Sample table")
$lines.Add("")
$lines.Add("| Sample | Role | Size | SHA256 match | SHA256 |")
$lines.Add("| --- | --- | ---: | --- | --- |")
foreach ($entry in $entries) {
    $size = if ($null -ne $entry.size_bytes) { [string]$entry.size_bytes } else { "missing" }
    $match = if ($entry.sha256_matches_expected) { "yes" } else { "no" }
    $sha = if ($entry.sha256) { $entry.sha256 } else { "missing" }
    $lines.Add("| ``$($entry.path)`` | $($entry.role) | $size | $match | ``$sha`` |")
}
$lines.Add("")
$lines.Add("## Verified facts")
$lines.Add("")
$lines.Add("- All metadata came from local filesystem reads under the repository workspace.")
$lines.Add("- The expected primary B-route samples are present if `Samples present` equals `Samples total`.")
$lines.Add("- Hash matching only proves local file identity against this plan's recorded sample list; it does not prove runtime invocability.")
$lines.Add("")
$lines.Add("## Next reverse targets")
$lines.Add("")
$lines.Add("1. Text-send static call graph: `SendTxtMessageByJid`, `MessageScheduling.SendChatMessage`, `Chat.SendMessage`, `XMPPConnection.send`.")
$lines.Add("2. File-send/upload static call graph: `OffLineFileSend.sendFile`, `FileTransfer.FileUpload`, `AsynFileUpload`, `sendFileMessage`.")
$lines.Add("3. Bridge/IPC/plugin map: `HttpServerLib`, plugin loaders, local HTTP, named pipes, command-line switches, services.")

($lines -join "`n") + "`n" | Set-Content -LiteralPath $reportFullPath -Encoding UTF8

[pscustomobject]@{
    ok = $true
    json_path = $jsonPath
    report_path = $reportFullPath
    samples_total = $summary.samples_total
    samples_present = $summary.samples_present
    hash_matches = $summary.hash_matches
    originals_copied = $false
    originals_modified = $false
} | ConvertTo-Json -Depth 4