param()

$ErrorActionPreference = 'Stop'

function Get-TrackedPaths {
    param(
        [string]$RepoRoot,
        [string]$Pattern
    )

    $output = & git -C $RepoRoot ls-files $Pattern
    if ($LASTEXITCODE -ne 0) {
        throw "git ls-files failed for pattern: $Pattern"
    }

    return @($output | Where-Object { $_ -and $_.Trim() })
}

function Normalize-Text {
    param([string]$Value)

    if ([string]::IsNullOrWhiteSpace($Value)) {
        return ''
    }

    $decoded = [System.Net.WebUtility]::HtmlDecode($Value)
    # Windows PowerShell leaves some supplementary-plane numeric emoji encoded.
    $decoded = [regex]::Replace($decoded, '&#(?<decimal>\d+);', {
        param($match)
        [char]::ConvertFromUtf32([int]$match.Groups['decimal'].Value)
    })
    $decoded = [regex]::Replace($decoded, '&#x(?<hex>[0-9a-f]+);', {
        param($match)
        [char]::ConvertFromUtf32([Convert]::ToInt32($match.Groups['hex'].Value, 16))
    }, [System.Text.RegularExpressions.RegexOptions]::IgnoreCase)
    return ([regex]::Replace($decoded, '\s+', ' ')).Trim()
}

function Resolve-WebPath {
    param(
        [string]$BasePath,
        [string]$RelativePath
    )

    $path = $RelativePath.Trim()
    if ($path.StartsWith('./')) {
        $path = $path.Substring(2)
    }

    if ($path.StartsWith('/')) {
        return $path.TrimStart('/')
    }

    return "$BasePath/$path" -replace '\\', '/' -replace '/+', '/'
}

$repoRoot = Split-Path -Parent $PSScriptRoot
$gamesRoot = Join-Path $repoRoot 'games'
$catalogPath = Join-Path $repoRoot 'js\game-catalog.js'
$sitemapPath = Join-Path $repoRoot 'sitemap.xml'
$siteRoot = 'https://supagamesai.com'

$trackedLevelIndexes = Get-TrackedPaths -RepoRoot $repoRoot -Pattern 'games/lvl*/index.html'
$trackedGameFiles = Get-TrackedPaths -RepoRoot $repoRoot -Pattern 'games/lvl*/*.html'
$trackedLearnFiles = Get-TrackedPaths -RepoRoot $repoRoot -Pattern 'learn/*.html'
$trackedGameSet = [System.Collections.Generic.HashSet[string]]::new([System.StringComparer]::OrdinalIgnoreCase)

foreach ($trackedPath in $trackedGameFiles) {
    if ($trackedPath -notlike '*/index.html') {
        [void]$trackedGameSet.Add($trackedPath.Replace('\', '/'))
    }
}

$catalog = New-Object System.Collections.Generic.List[object]
$levelEntries = New-Object System.Collections.Generic.List[object]

$cardPattern = '<a\s+href="(?<href>[^"]+)"\s+class="[^"]*\bgame-card\b[^"]*"[^>]*>\s*<span\s+class="game-icon">(?<icon>.*?)</span>.*?<h3(?:\s+[^>]*)?>(?<title>.*?)</h3>\s*<p(?:\s+[^>]*)?>(?<description>.*?)</p>\s*</a>'

foreach ($relativeIndex in $trackedLevelIndexes) {
    $indexPath = Join-Path $repoRoot $relativeIndex
    $html = Get-Content $indexPath -Raw -Encoding UTF8
    $levelId = [regex]::Match($relativeIndex, 'games/(?<level>lvl\d+)/index\.html').Groups['level'].Value
    $levelNumber = [int]([regex]::Match($levelId, '\d+').Value)
    $indexDir = Split-Path $relativeIndex -Parent
    $headingMatch = [regex]::Match($html, '<h1>(?<heading>[^<]+)</h1>', [System.Text.RegularExpressions.RegexOptions]::IgnoreCase)
    $heading = Normalize-Text $headingMatch.Groups['heading'].Value
    $theme = $heading

    if ($heading -match ':\s*(.+)$') {
        $theme = $matches[1].Trim()
    }

    $cards = [regex]::Matches(
        $html,
        $cardPattern,
        [System.Text.RegularExpressions.RegexOptions]::IgnoreCase -bor [System.Text.RegularExpressions.RegexOptions]::Singleline
    )

    $validCardCount = 0
    foreach ($card in $cards) {
        $gamePath = Resolve-WebPath -BasePath $indexDir.Replace('\', '/') -RelativePath $card.Groups['href'].Value
        if (-not $trackedGameSet.Contains($gamePath)) {
            continue
        }

        $validCardCount++
        $catalog.Add([pscustomobject]@{
            url = $gamePath
            title = Normalize-Text $card.Groups['title'].Value
            description = Normalize-Text $card.Groups['description'].Value
            icon = Normalize-Text $card.Groups['icon'].Value
            levelId = $levelId
            levelNumber = $levelNumber
            levelLabel = ('Level {0}' -f $levelNumber)
            theme = $theme
        }) | Out-Null
    }

    if ($validCardCount -gt 0) {
        $levelEntries.Add([pscustomobject]@{
            path = $relativeIndex.Replace('\', '/')
            levelId = $levelId
            levelNumber = $levelNumber
        }) | Out-Null
    }
}

$catalog = $catalog |
    Sort-Object levelNumber, url |
    ForEach-Object {
        [pscustomobject]@{
            url = $_.url
            title = $_.title
            description = $_.description
            icon = $_.icon
            levelId = $_.levelId
            levelNumber = $_.levelNumber
            levelLabel = $_.levelLabel
            theme = $_.theme
        }
    }

$catalogJson = $catalog | ConvertTo-Json -Depth 4
$catalogOutput = @(
    '// Generated by scripts/build-home-data.ps1',
    'window.SUPAGAMES_CATALOG = ' + $catalogJson + ';'
) -join [Environment]::NewLine

Set-Content -Path $catalogPath -Value $catalogOutput -Encoding utf8

$sitemapEntries = New-Object System.Collections.Generic.List[object]
$sitemapEntries.Add([pscustomobject]@{ loc = '/'; priority = '1.0'; changefreq = 'daily' }) | Out-Null
$sitemapEntries.Add([pscustomobject]@{ loc = '/games/'; priority = '0.9'; changefreq = 'daily' }) | Out-Null
$sitemapEntries.Add([pscustomobject]@{ loc = '/community-games.html'; priority = '0.6'; changefreq = 'weekly' }) | Out-Null
$sitemapEntries.Add([pscustomobject]@{ loc = '/info.html'; priority = '0.4'; changefreq = 'monthly' }) | Out-Null
$sitemapEntries.Add([pscustomobject]@{ loc = '/changelog.html'; priority = '0.6'; changefreq = 'weekly' }) | Out-Null
$sitemapEntries.Add([pscustomobject]@{ loc = '/privacy.html'; priority = '0.3'; changefreq = 'monthly' }) | Out-Null
$sitemapEntries.Add([pscustomobject]@{ loc = '/terms.html'; priority = '0.3'; changefreq = 'monthly' }) | Out-Null
$sitemapEntries.Add([pscustomobject]@{ loc = '/contact.html'; priority = '0.3'; changefreq = 'monthly' }) | Out-Null

foreach ($learnPath in ($trackedLearnFiles | Sort-Object)) {
    $learnLoc = '/' + $learnPath.Replace('\', '/')
    if ($learnLoc -eq '/learn/index.html') {
        $learnLoc = '/learn/'
    }

    $sitemapEntries.Add([pscustomobject]@{
        loc = $learnLoc
        priority = '0.7'
        changefreq = 'monthly'
    }) | Out-Null
}

foreach ($levelEntry in ($levelEntries | Sort-Object levelNumber)) {
    $sitemapEntries.Add([pscustomobject]@{
        loc = '/' + $levelEntry.path
        priority = '0.8'
        changefreq = 'weekly'
    }) | Out-Null
}

foreach ($game in $catalog) {
    $sitemapEntries.Add([pscustomobject]@{
        loc = '/' + $game.url
        priority = '0.5'
        changefreq = 'monthly'
    }) | Out-Null
}

$xmlSettings = New-Object System.Xml.XmlWriterSettings
$xmlSettings.Encoding = [System.Text.UTF8Encoding]::new($false)
$xmlSettings.Indent = $true
$xmlSettings.NewLineChars = "`n"
$xmlSettings.NewLineHandling = [System.Xml.NewLineHandling]::Replace

$writer = [System.Xml.XmlWriter]::Create($sitemapPath, $xmlSettings)

try {
    $writer.WriteStartDocument()
    $writer.WriteStartElement('urlset', 'http://www.sitemaps.org/schemas/sitemap/0.9')

    foreach ($entry in $sitemapEntries) {
        $writer.WriteStartElement('url')
        $writer.WriteElementString('loc', $siteRoot + $entry.loc)
        $writer.WriteElementString('priority', $entry.priority)
        $writer.WriteElementString('changefreq', $entry.changefreq)
        $writer.WriteEndElement()
    }

    $writer.WriteEndElement()
    $writer.WriteEndDocument()
}
finally {
    $writer.Dispose()
}

Write-Output ("Generated catalog with {0} games across {1} active levels." -f $catalog.Count, $levelEntries.Count)