$ErrorActionPreference = 'Stop'

$apiUrl = 'https://api.github.com/repos/LukeYui/EldenRingSeamlessCoopRelease/releases/latest'
$scDownloadUrl = $null
$localPath = $null

$input = Read-Host "Do you want to use the official Github-Repository [d] to download the mod or use an already downloaded .zip? [l] [D/l]"

if ($input -match '^(l|local)$') {
    Write-Host "Searching Downloads folder..."

    $downloads = Join-Path $HOME 'Downloads'

    $localPath = Get-ChildItem -Path $downloads -Filter 'Seamless*.zip' -File -ErrorAction SilentlyContinue |
        Select-Object -First 1 -ExpandProperty FullName

    if ($localPath -and (Test-Path $localPath)) {
        Write-Host "File found at $localPath"
    }
    else {
        Write-Host "File not found in $downloads"

        $input = Read-Host "Please specify the path to your local .zip archive"

        if ([string]::IsNullOrWhiteSpace($input) -or $input -eq 'null') {
            throw "Empty path provided"
        }
        elseif (Test-Path $input -PathType Leaf) {
            $localPath = $input
            Write-Host "File found at $localPath"
        }
        elseif (Test-Path $input -PathType Container) {
            $localPath = Get-ChildItem -Path $input -Filter 'Seamless*.zip' -File -Recurse -ErrorAction SilentlyContinue |
                Select-Object -First 1 -ExpandProperty FullName

            if ($localPath) {
                Write-Host "File found at $localPath"
            }
            else {
                throw "File not found at $input"
            }
        }
        else {
            throw "Invalid path provided"
        }
    }
}
else {
    $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')) {
            $input = Read-Host "Is this your Elden Ring Game folder? $path [Y/n]"

            if ($input -notmatch '^(n|no)$') {
                return $path
            }
        }
    }

    $drives = Get-PSDrive -PSProvider FileSystem | Select-Object -ExpandProperty Root

    foreach ($drive in $drives) {
        Write-Host "Searching at $drive"

        $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) {
            $input = Read-Host "Is this your Elden Ring Game folder? $($hit.DirectoryName) [Y/n]"

            if ($input -notmatch '^(n|no)$') {
                return $hit.DirectoryName
            }
        }
    }

    return $null
}

Write-Host "Searching for Elden Ring game folder"

$eldenringDir = Get-EldenRingGameDir

if (-not $eldenringDir) {
    $eldenringDir = Read-Host "Please provide your Elden Ring Directory Path"

    if (-not (Test-Path (Join-Path $eldenringDir 'eldenring.exe'))) {
        throw "Incorrect Elden Ring directory. 'eldenring.exe' not found at provided path."
    }

    Write-Host "Correct Elden Ring directory"
}

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

$zipPath = Join-Path $tempDir 'ersc.zip'

if (-not $scDownloadUrl -and $localPath) {
    Write-Host "Copying .zip"
    Copy-Item $localPath $zipPath -Force
}
else {
    Write-Host "Downloading Seamless Coop"
    Write-Host "Download URL: $scDownloadUrl"
    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."