$ErrorActionPreference = 'Stop'

$apiUrl = 'https://api.github.com/repos/LukeYui/EldenRingSeamlessCoopRelease/releases/latest'
$release = Invoke-RestMethod -Uri $apiUrl -Headers @{ 'User-Agent' = 'PowerShell' }
$scDownloadUrl = $release.assets[0].browser_download_url

function Get-EldenRingGameDir {
    $steamPaths = @(
        "$env:ProgramFiles(x86)\Steam\steamapps\common\Elden Ring\Game",
        "$env:ProgramFiles\Steam\steamapps\common\Elden Ring\Game",
        "$env:LOCALAPPDATA\Programs\Steam\steamapps\common\Elden Ring\Game"
    )

    foreach ($path in $steamPaths) {
        if (Test-Path (Join-Path $path 'eldenring.exe')) { return $path }
    }

    $drives = Get-PSDrive -PSProvider FileSystem | Select-Object -ExpandProperty Root
    foreach ($drive in $drives) {
        $hit = Get-ChildItem -Path $drive -Filter 'eldenring.exe' -Recurse -File -ErrorAction SilentlyContinue |
            Where-Object { $_.FullName -match '\\Elden Ring\\Game\\eldenring\.exe$' } |
            Select-Object -First 1
        if ($hit) { return $hit.DirectoryName }
    }

    return $null
}

$eldenringDir = Get-EldenRingGameDir

if (-not $eldenringDir) {
    $eldenringDir = Read-Host "Could not auto-detect your Elden Ring Game folder. Enter the full Game folder path"
    if (-not (Test-Path (Join-Path $eldenringDir 'eldenring.exe'))) {
        throw "Incorrect Elden Ring directory. 'eldenring.exe' not found at provided path."
    }
} else {
    $input = Read-Host "Is this your Elden Ring Game folder? $eldenringDir [Y/n]"
    if ($input -match '^(n|no)$') {
        $eldenringDir = Read-Host "Please provide your Elden Ring Game folder path"
        if (-not (Test-Path (Join-Path $eldenringDir 'eldenring.exe'))) {
            throw "Incorrect Elden Ring directory. 'eldenring.exe' not found at provided path."
        }
    }
}

$tempDir = Join-Path $PWD 'ersc-download'
New-Item -ItemType Directory -Path $tempDir -Force | Out-Null

Write-Host "Downloading Seamless Coop"
Write-Host "Download URL: $scDownloadUrl"
$zipPath = Join-Path $tempDir 'ersc.zip'
Invoke-WebRequest -Uri $scDownloadUrl -OutFile $zipPath

Write-Host "Extracting downloaded files"
Expand-Archive -Path $zipPath -DestinationPath $tempDir -Force

$seamlessDir = Join-Path $tempDir 'SeamlessCoop'
$launcherPath = Join-Path $eldenringDir 'ersc_launcher.exe'

if (Test-Path $launcherPath) {
    $input = Read-Host "Override existing Seamless Coop settings? This resets your Seamless Coop settings, including multiplayer password [Y/n]"
    if ($input -match '^(n|no)$') {
        $settings = Join-Path $seamlessDir 'ersc_settings.ini'
        if (Test-Path $settings) { Remove-Item $settings -Force }
    }
}

Write-Host "Copying files to Elden Ring Game folder"
Copy-Item -Path (Join-Path $tempDir '*') -Destination $eldenringDir -Recurse -Force

Write-Host "Cleaning up"
Remove-Item $tempDir -Recurse -Force

Write-Host "Done. Launch ersc_launcher.exe from the Game folder."