param(
    [Parameter(Mandatory = $true)]
    [string]$VersionTag,
    [string]$MetaPath = "Mods/DnD 5.5e AIO Russian/meta.lsx",
    [string]$RepositoryPath = "."
)

$ErrorActionPreference = "Stop"

function Get-ReleaseVersionParts {
    param(
        [string]$Tag,
        [string]$RepoPath
    )

    $normalized = $Tag
    if ($normalized.StartsWith("v")) {
        $normalized = $normalized.Substring(1)
    }

    if ($normalized -notmatch '^(?<base>\d+\.\d+\.\d+)(?:-(?<suffix>[0-9A-Za-z][0-9A-Za-z.-]*))?$') {
        throw "Version tag '$Tag' is invalid. Expected format: vX.Y.Z or vX.Y.Z-suffix"
    }

    $baseVersion = $Matches.base
    $suffix = $Matches.suffix
    $parts = $baseVersion.Split(".")
    $numbers = @(0, 0, 0, 0)
    for ($i = 0; $i -lt $parts.Length; $i++) {
        $numbers[$i] = [int]$parts[$i]
    }

    if ($suffix) {
        $resolvedRepoPath = [System.IO.Path]::GetFullPath($RepoPath)
        $matchingTags = @()

        try {
            $matchingTags = @(git -C $resolvedRepoPath tag --list "v$baseVersion-*" 2>$null | Where-Object { $_ -and $_ -ne $Tag })
        } catch {
            $matchingTags = @()
        }

        $numbers[3] = $matchingTags.Count + 1
    }

    return [pscustomobject]@{
        BaseVersion = $baseVersion
        Suffix = $suffix
        Version64 = ([int64]$numbers[0] -shl 55) -bor ([int64]$numbers[1] -shl 47) -bor ([int64]$numbers[2] -shl 31) -bor [int64]$numbers[3]
    }
}

$resolvedMetaPath = [System.IO.Path]::GetFullPath($MetaPath)
if (-not (Test-Path -LiteralPath $resolvedMetaPath)) {
    throw "meta.lsx was not found: '$resolvedMetaPath'."
}

$releaseVersion = Get-ReleaseVersionParts -Tag $VersionTag -RepoPath $RepositoryPath
$resolvedVersion64 = $releaseVersion.Version64
$utf8Encoding = [System.Text.UTF8Encoding]::new($false)
$metaContent = [System.IO.File]::ReadAllText($resolvedMetaPath, $utf8Encoding)
[xml]$metaXml = $metaContent

# Explicitly target ModuleInfo/Version64 via XML path to avoid touching Dependencies/PublishVersion.
$moduleInfoVersionNode = $metaXml.SelectSingleNode('/save/region/node/children/node[@id="ModuleInfo"]/attribute[@id="Version64" and @type="int64"]')
if ($null -eq $moduleInfoVersionNode) {
    throw "ModuleInfo/Version64 attribute was not found in '$resolvedMetaPath'."
}

# Replace only the Version64 attribute that appears inside ModuleInfo before its <children> block.
$moduleInfoVersionPattern = '(?s)(<node id="ModuleInfo">\s*(?:(?!<children>).)*?<attribute id="Version64" type="int64" value=")\d+("/>)'
if ($metaContent -notmatch $moduleInfoVersionPattern) {
    throw "ModuleInfo/Version64 attribute was not found in '$resolvedMetaPath'."
}

$updatedMeta = [regex]::Replace(
    $metaContent,
    $moduleInfoVersionPattern,
    "`${1}$resolvedVersion64`${2}",
    1
)

[System.IO.File]::WriteAllText($resolvedMetaPath, $updatedMeta, $utf8Encoding)

Write-Host "[set-version.ps1] Updated '$resolvedMetaPath' to Version64=$resolvedVersion64 (from tag '$VersionTag', base '$($releaseVersion.BaseVersion)')."