#requires -Version 5
<#
.SYNOPSIS
    Generates manifest.json deterministically from pack.lock.json.

.DESCRIPTION
    The lockfile (pack.lock.json) is the source of truth for every mod's exact
    version, URL, SHA-1, and size. Running this script does not change versions.

    To intentionally bump versions, use Update-Pack.ps1 with the -Refresh flag.
    To see what new versions are available, use Check-Updates.ps1.

    Workflow:
      1. Edit pack.lock.json (manually or via Update-Pack.ps1 -Refresh)
      2. Run Build-Pack.ps1 -OutputPath ...\manifest.json
      3. Update the server to match
      4. Deploy manifest to your hosted URL

.PARAMETER OutputPath
    Where to write manifest.json.

.PARAMETER LocalPackSource
    Optional folder containing local override files (configs, resourcepacks, etc.).

.PARAMETER SelfHostBaseUrl
    Public URL prefix for self-hosted files (only used when LocalPackSource is set).
#>

[CmdletBinding()]
param(
    [string]$OutputPath        = ".\manifest.json",
    [string]$LocalPackSource   = "",
    [string]$SelfHostBaseUrl   = "https://sijbers.uk/pack/files",
    # Optional -- point at a published launcher .exe to embed launcherVersion + launcherUrl
    # in the manifest. The launcher displays a "newer version available" banner when
    # its embedded version is lower than this. Skip entirely to leave both fields out.
    [string]$LauncherExePath   = "",
    [string]$LauncherPublicUrl = "https://sijbers.uk/pack/BrassAndSigil-Launcher.exe",
    # Skip the auto-invoke of Build-Tweaks.ps1 (only touch this if you're debugging).
    [switch]$SkipTweaks
)

$ErrorActionPreference = 'Stop'
$ProgressPreference    = 'SilentlyContinue'

$here     = Split-Path -Parent $MyInvocation.MyCommand.Path
$lockPath = Join-Path $here '..\pack\pack.lock.json'

# Build any data-only tweak jars first, then fold the resulting overrides
# folder into the manifest. Set -SkipTweaks to bypass. The "overrides" name
# matches CurseForge/Modrinth modpack conventions: files that override or
# augment the standard mod set, hosted by us.
$tweaksRoot    = Join-Path $here '..\pack\tweaks'
$overridesRoot = Join-Path $here '..\pack\overrides'
if (-not $SkipTweaks -and (Test-Path $tweaksRoot)) {
    & (Join-Path $here 'Build-Tweaks.ps1') -TweaksRoot $tweaksRoot -OutputRoot (Join-Path $overridesRoot 'mods')
}
if (-not $LocalPackSource -and (Test-Path $overridesRoot)) {
    $LocalPackSource = $overridesRoot
}

if (-not (Test-Path $lockPath)) {
    throw "pack.lock.json not found at $lockPath. Run Update-Pack.ps1 -Refresh first to bootstrap it."
}

$lock = Get-Content $lockPath -Raw | ConvertFrom-Json

Write-Host ""
Write-Host "Building manifest from pack.lock.json:"
Write-Host ("  Pack:     {0} v{1}" -f $lock.name, $lock.version)
Write-Host ("  MC:       {0} ({1} {2})" -f $lock.minecraft, $lock.loader.type, $lock.loader.version)
Write-Host ("  Locked:   {0}" -f $lock.lockedAt)
Write-Host ("  Mods:     {0}" -f $lock.mods.Count)
Write-Host ""

$files = @()
$totalBytes = 0L

foreach ($mod in $lock.mods) {
    $files += [pscustomobject]@{
        path = $mod.path
        url  = $mod.url
        sha1 = $mod.sha1
        size = $mod.size
    }
    $totalBytes += $mod.size
    Write-Host ("  [{0}] {1,-26} {2,-22} {3,8:N0} KB" -f $mod.source.PadRight(7).Substring(0,7), $mod.slug, $mod.version, ($mod.size/1KB))
}

# Local overrides (configs, custom files not on Modrinth/CurseForge)
if ($LocalPackSource -and (Test-Path $LocalPackSource)) {
    Write-Host ""
    Write-Host "Adding local overrides from $LocalPackSource..."
    $managedRoots = @('mods', 'config', 'resourcepacks', 'shaderpacks', 'kubejs', 'defaultconfigs')
    $base = $SelfHostBaseUrl.TrimEnd('/')
    $sourceFull = (Resolve-Path $LocalPackSource).Path.TrimEnd('\','/')
    foreach ($root in $managedRoots) {
        $rootDir = Join-Path $LocalPackSource $root
        if (-not (Test-Path $rootDir)) { continue }
        Get-ChildItem -Path $rootDir -Recurse -File | ForEach-Object {
            $rel = $_.FullName.Substring($sourceFull.Length).TrimStart('\','/') -replace '\\','/'
            $sha1 = (Get-FileHash -Algorithm SHA1 -Path $_.FullName).Hash.ToLowerInvariant()
            $files += [pscustomobject]@{
                path = $rel
                url  = "$base/$rel"
                sha1 = $sha1
                size = $_.Length
            }
            $totalBytes += $_.Length
            Write-Host ("  [local]   {0}" -f $rel)
        }
    }
}

$manifest = [ordered]@{
    name      = $lock.name
    version   = $lock.version
    minecraft = [ordered]@{ version = $lock.minecraft }
    loader    = [ordered]@{ type = $lock.loader.type; version = $lock.loader.version }
    files     = $files
}

# Optional: copy a defaultServer block through from the lockfile so the launcher
# can pre-populate friends' multiplayer list. Lockfile schema:
#   "defaultServer": { "name": "Brass & Sigil", "ip": "bns.sijbers.uk" }
if ($lock.PSObject.Properties.Name -contains "defaultServer" -and $lock.defaultServer) {
    $manifest.defaultServer = [ordered]@{
        name = $lock.defaultServer.name
        ip   = $lock.defaultServer.ip
    }
    Write-Host ("  Default server: {0} ({1})" -f $lock.defaultServer.name, $lock.defaultServer.ip)
}

# Optional: shader pack to enable by default on fresh installs. Lockfile schema:
#   "defaultShader": "ComplementaryReimagined_r5.7.1.zip"
if ($lock.PSObject.Properties.Name -contains "defaultShader" -and $lock.defaultShader) {
    $manifest.defaultShader = $lock.defaultShader
    Write-Host ("  Default shader: {0}" -f $lock.defaultShader)
}

# Optional: public URL of the brass-sigil-server panel. Used by the launcher
# to send friend-side whitelist requests. Lockfile schema:
#   "panelUrl": "https://bns-admin.sijbers.uk"
if ($lock.PSObject.Properties.Name -contains "panelUrl" -and $lock.panelUrl) {
    $manifest.panelUrl = $lock.panelUrl
    Write-Host ("  Panel URL: {0}" -f $lock.panelUrl)
}

# Optional launcher metadata: when -LauncherExePath is supplied, read the exe's
# FileVersion (set via <Version> in ModpackLauncher.csproj) and embed it. The
# launcher compares its assembly version to this value and shows an upgrade
# banner pointing at LauncherPublicUrl when older.
if ($LauncherExePath) {
    if (-not (Test-Path $LauncherExePath)) {
        throw "LauncherExePath '$LauncherExePath' does not exist."
    }
    $launcherFile = Get-Item $LauncherExePath
    $launcherVersion = $launcherFile.VersionInfo.FileVersion
    if ([string]::IsNullOrWhiteSpace($launcherVersion)) {
        throw "Launcher exe has no FileVersion -- set <Version> in ModpackLauncher.csproj and republish."
    }
    # FileVersion is the four-component form (e.g. "0.1.0.0" for csproj <Version>0.1.0</Version>).
    # Embed as-is -- the launcher's Version.Parse handles it directly and avoids ambiguous
    # comparisons between trimmed and untrimmed forms.
    $manifest.launcherVersion = $launcherVersion
    $manifest.launcherUrl     = $LauncherPublicUrl

    Write-Host ""
    Write-Host ("Launcher metadata embedded:")
    Write-Host ("  Version:  {0}" -f $launcherVersion)
    Write-Host ("  Url:      {0}" -f $LauncherPublicUrl)
    Write-Host ("  Source:   {0}" -f $launcherFile.FullName)
}

$json = $manifest | ConvertTo-Json -Depth 10
$outDir = Split-Path -Parent $OutputPath
if ($outDir -and -not (Test-Path $outDir)) { New-Item -ItemType Directory -Path $outDir | Out-Null }
[System.IO.File]::WriteAllText($OutputPath, $json, [System.Text.UTF8Encoding]::new($false))

Write-Host ""
Write-Host "Manifest written: $OutputPath"
Write-Host ("  Files:    {0}" -f $files.Count)
Write-Host ("  Total:    {0:N1} MB (download size)" -f ($totalBytes / 1MB))