[CmdletBinding()]
param(
    [string]$ClientPath = '',
    [string]$PackagePath = '',
    [ValidateSet('Debug', 'Release')]
    [string]$Configuration = 'Release',
    [switch]$SkipDataBuild,
    [switch]$SkipManifest,
    [switch]$NativeRenderer,
    [switch]$StopClient,
    [switch]$Launch
)

$ErrorActionPreference = 'Stop'
$repoRoot = $PSScriptRoot

function Import-ProjectEnvironment {
    $envFile = Join-Path $repoRoot '.env'
    if (-not (Test-Path -LiteralPath $envFile -PathType Leaf)) { return }

    foreach ($line in Get-Content -LiteralPath $envFile -Encoding UTF8) {
        if ($line -notmatch '^\s*([^#][^=]+)=(.*)$') { continue }
        $name = $matches[1].Trim()
        $value = $matches[2].Trim().Trim('"').Trim("'")
        if ($name -and -not (Test-Path "Env:$name")) {
            Set-Item -Path "Env:$name" -Value $value
        }
    }
}

Import-ProjectEnvironment

if ([string]::IsNullOrWhiteSpace($ClientPath)) {
    $ClientPath = if ($env:WOW_HOME) {
        $env:WOW_HOME
    } else {
        'C:\Program Files (x86)\World of Warcraft'
    }
}
if ([string]::IsNullOrWhiteSpace($PackagePath)) {
    $PackagePath = Join-Path $repoRoot 'dist'
}

$ClientPath = [System.IO.Path]::GetFullPath($ClientPath)
$PackagePath = [System.IO.Path]::GetFullPath($PackagePath)
if (-not (Test-Path -LiteralPath $ClientPath -PathType Container)) {
    throw "Client directory was not found: $ClientPath"
}

$runningClients = @(Get-Process Wow -ErrorAction SilentlyContinue | Where-Object {
    $_.Path -and $_.Path.StartsWith($ClientPath, [System.StringComparison]::OrdinalIgnoreCase)
})
if ($runningClients.Count) {
    if (-not $StopClient) {
        throw 'Wow.exe is running. Close the client or repeat deployment with -StopClient.'
    }

    Write-Host 'Stopping the running WoW client...'
    $runningClients | Stop-Process -Force
    Start-Sleep -Seconds 2
    Get-Process WarcraftXLHost -ErrorAction SilentlyContinue | Where-Object {
        $_.Path -and $_.Path.StartsWith($ClientPath, [System.StringComparison]::OrdinalIgnoreCase)
    } | Stop-Process -Force
}

$env:WOW_HOME = $ClientPath
Write-Host "MoonWell client: $ClientPath"
Write-Host "Package staging: $PackagePath"

Write-Host '[1/5] Initializing WarcraftXL dependencies...'
& git -C $repoRoot submodule update --init --recursive
if ($LASTEXITCODE -ne 0) { throw 'Git submodule initialization failed.' }

New-Item -ItemType Directory -Path $PackagePath -Force | Out-Null

if (-not $SkipDataBuild) {
    Write-Host '[2/5] Building MPQ patches...'
    $tool = Join-Path $repoRoot 'tool\target\release\tool.exe'
    if (-not (Test-Path -LiteralPath $tool -PathType Leaf)) {
        $cargo = Get-Command cargo -ErrorAction SilentlyContinue
        if (-not $cargo) { throw 'Cargo was not found and the MPQ builder is not compiled.' }
        & $cargo.Source build --release --manifest-path (Join-Path $repoRoot 'tool\Cargo.toml')
        if ($LASTEXITCODE -ne 0) { throw 'MPQ builder compilation failed.' }
    }

    & $tool (Join-Path $repoRoot 'src') $PackagePath
    if ($LASTEXITCODE -ne 0) { throw 'MPQ patch build failed.' }
} else {
    Write-Host '[2/5] MPQ build skipped.'
}

Write-Host '[3/5] Building and installing WarcraftXL...'
$buildArguments = @{
    Configuration = $Configuration
    ClientPath = $ClientPath
    PackagePath = $PackagePath
    Deploy = $true
}
if ($NativeRenderer) { $buildArguments.NativeRenderer = $true }
& (Join-Path $repoRoot 'build-warcraftxl.ps1') @buildArguments
if ($LASTEXITCODE -ne 0) { throw 'WarcraftXL deployment failed.' }

Write-Host '[4/5] Synchronizing package files...'
& robocopy $PackagePath $ClientPath /E /R:2 /W:1 /NFL /NDL /NJH /NJS /NP
$robocopyExitCode = $LASTEXITCODE
if ($robocopyExitCode -ge 8) {
    throw "Package synchronization failed with robocopy exit code $robocopyExitCode."
}

if (-not $SkipManifest) {
    Write-Host '[5/5] Building launcher manifest...'
    $python = Get-Command python -ErrorAction SilentlyContinue
    if (-not $python) { throw 'Python was not found; launcher manifest was not generated.' }
    & $python.Source (Join-Path $repoRoot 'build_manifest.py') `
        --dir $PackagePath --output (Join-Path $repoRoot 'manifest.json')
    if ($LASTEXITCODE -ne 0) { throw 'Launcher manifest generation failed.' }
} else {
    Write-Host '[5/5] Manifest generation skipped.'
}

$wowHash = (Get-FileHash -LiteralPath (Join-Path $ClientPath 'Wow.exe') -Algorithm SHA256).Hash
$renderer = if ($NativeRenderer) { 'native D3D9 recovery proxy' } else { 'WarcraftXL D3D9On12' }
Write-Host ''
Write-Host 'Deployment complete.'
Write-Host "  Renderer: $renderer"
Write-Host "  Wow.exe SHA-256: $wowHash"
Write-Host "  Host: $(Join-Path $ClientPath 'Utils\WarcraftXLHost.exe')"

if ($Launch) {
    Write-Host 'Launching Wow.exe...'
    Start-Process -FilePath (Join-Path $ClientPath 'Wow.exe') -WorkingDirectory $ClientPath
}

# robocopy uses successful non-zero exit codes; do not leak one to callers.
$global:LASTEXITCODE = 0