#Requires -Version 5.1
<#
.SYNOPSIS
    Installs Helix Editor (TUI text editor) and its runtime directory on Windows.

.DESCRIPTION
    Auto-detects the latest release from https://github.com/helix-editor/helix/releases,
    downloads the x86_64-windows.zip archive, extracts it, installs hx.exe
    to your local bin directory, and deploys the essential runtime files
    to %APPDATA%\helix\runtime.

    Supported architectures:
      - Windows x64 (AMD64 / Intel 64bit)

.PARAMETER InstallDir
    Directory to install hx.exe. Default: $env:USERPROFILE\.local\bin

.PARAMETER AddToPath
    Whether to permanently add InstallDir to user PATH. Default: $true

.EXAMPLE
    .\install-helix.ps1

    # One-liner install from remote (works on Windows 10+):
    powershell -ExecutionPolicy Bypass -c "[Net.ServicePointManager]::SecurityProtocol=[Net.SecurityProtocolType]::Tls12; $t=\"$env:TEMP\install-helix.ps1\"; iwr -useb 'https://gl.isitsoft.kr/publicproj/install-sh/-/raw/main/install-helix.ps1' -OutFile $t; & $t"

.NOTES
    If execution policy error occurs:
      Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser
#>

[CmdletBinding()]
param(
    [string] $InstallDir = "$env:USERPROFILE\.local\bin",
    [bool]   $AddToPath = $true
)

# 최신 윈도우 환경 및 에러 발생 시 즉시 중단 설정
Set-StrictMode -Version Latest
$ErrorActionPreference = 'Stop'

# HTTPS 다운로드를 위한 TLS 1.2 강제 (Windows 7/10 및 PowerShell 5.1 호환성 보장)
[Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12

# ────────────────────────────────────────────
# 유틸리티 함수 정의 (모든 안내 문구는 영문으로 작성)
# ────────────────────────────────────────────
function Write-Info    { param([string]$msg) Write-Host "[INFO]  $msg" -ForegroundColor Cyan }
    # 정보 출력
function Write-Warn    { param([string]$msg) Write-Host "[WARN]  $msg" -ForegroundColor Yellow }
    # 경고 출력
function Write-Success { param([string]$msg) Write-Host "[OK]    $msg" -ForegroundColor Green }
    # 성공 출력
function Write-Err     { param([string]$msg) Write-Host "[ERROR] $msg" -ForegroundColor Red; exit 1 }
    # 에러 출력 및 스크립트 강제 종료

# ────────────────────────────────────────────
# 상수 정의
# ────────────────────────────────────────────
$REPO = "helix-editor/helix"
$API_URL = "https://api.github.com/repos/$REPO/releases/latest"
$HELIX_CONFIG_DIR = Join-Path $env:APPDATA "helix"

# ────────────────────────────────────────────
# 메인 설치 프로세스
# ────────────────────────────────────────────
function Main {
    Write-Info "===== Helix Editor install script (Windows PowerShell) ====="

    # 1) 운영체제 아키텍처 감지 (Helix는 현재 64비트 Windows 빌드만 공식 배포)
    $envArch = $env:PROCESSOR_ARCHITEW6432
    if (-not $envArch) { $envArch = $env:PROCESSOR_ARCHITECTURE }
    if ($envArch -ne "AMD64" -and $envArch -ne "ARM64") {
        Write-Err "Helix editor only provides 64-bit Windows builds. Detected architecture: $envArch"
    }

    # 2) GitHub 최신 릴리스 정보 획득
    Write-Info "Fetching latest Helix release information from GitHub API..."
    try {
        $release = Invoke-RestMethod -Uri $API_URL -UseBasicParsing -Headers @{ 'User-Agent' = 'install-helix-ps1' }
    } catch {
        Write-Err "GitHub API call failed: $_"
    }

    $tagName = $release.tag_name
    $version = $tagName -replace '^v', ''
    Write-Info "Latest Helix version confirmed: $tagName"

    # 3) 윈도우 x86_64용 zip 파일 에셋 탐색
    $asset = $release.assets | Where-Object { $_.name -like "*-x86_64-windows.zip" } | Select-Object -First 1
    if (-not $asset) {
        # 에셋 조회가 되지 않을 경우 릴리스 패턴에 맞추어 다운로드 URL 직접 빌드
        $zipName = "helix-${version}-x86_64-windows.zip"
        $downloadUrl = "https://github.com/$REPO/releases/download/$tagName/$zipName"
        Write-Warn "Could not find asset in GitHub response. Trying fallback URL: $downloadUrl"
    } else {
        $zipName = $asset.name
        $downloadUrl = $asset.browser_download_url
    }

    # 4) 임시 작업 디렉토리 생성 및 아카이브 다운로드
    $tmpDir = Join-Path $env:TEMP "helix_install_$(Get-Random)"
    New-Item -ItemType Directory -Path $tmpDir -Force | Out-Null
    $tmpZipPath = Join-Path $tmpDir $zipName

    try {
        Write-Info "Downloading archive: $downloadUrl"
        $ProgressPreference = 'SilentlyContinue' # 다운로드 속도 향상을 위해 진행바 숨김
        Invoke-WebRequest -Uri $downloadUrl -OutFile $tmpZipPath -UseBasicParsing
        $ProgressPreference = 'Continue'

        # 5) 압축 해제
        Write-Info "Extracting archive..."
        Expand-Archive -Path $tmpZipPath -DestinationPath $tmpDir -Force

        # 압축 해제 폴더 탐색 (helix-vXX.XX.X-x86_64-windows 구조)
        $extractedFolder = Get-ChildItem -Path $tmpDir -Directory | Where-Object { $_.Name -like "helix-*" } | Select-Object -First 1
        if (-not $extractedFolder) {
            Write-Err "Failed to find extracted Helix directory in temporary path."
        }

        # 6) 바이너리 복사 (hx.exe)
        $hxExe = Join-Path $extractedFolder.FullName "hx.exe"
        if (-not (Test-Path $hxExe)) {
            Write-Err "hx.exe not found in the extracted folder: $($extractedFolder.FullName)"
        }

        if (-not (Test-Path $InstallDir)) {
            Write-Info "Creating installation directory: $InstallDir"
            New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null
        }

        $destExePath = Join-Path $InstallDir "hx.exe"
        Write-Info "Deploying binary to: $destExePath"
        Copy-Item -Path $hxExe -Destination $destExePath -Force

        # 7) 런타임(runtime) 디렉토리 설치
        # Helix 에디터는 테마, 언어 쿼리 등을 로드하기 위해 runtime 디렉토리가 필수적으로 요구됩니다.
        # Windows의 경우 %APPDATA%\helix\runtime에 런타임 폴더가 복사되어야 합니다.
        $srcRuntime = Join-Path $extractedFolder.FullName "runtime"
        if (-not (Test-Path $srcRuntime)) {
            Write-Err "Runtime directory not found in the extracted folder."
        }

        $destRuntime = Join-Path $HELIX_CONFIG_DIR "runtime"
        if (Test-Path $destRuntime) {
            Write-Warn "Existing Helix runtime directory detected: $destRuntime"
            $backupRuntime = "${destRuntime}.bak.$(Get-Date -Format 'yyyyMMddHHmmss')"
            Write-Info "Backing up existing runtime to: $backupRuntime"
            # 동일한 드라이브 내 Rename을 수행하기 위해 새 폴더명(이름만)을 제공합니다.
            Rename-Item -Path $destRuntime -NewName (Split-Path $backupRuntime -Leaf) -Force
        }

        if (-not (Test-Path $HELIX_CONFIG_DIR)) {
            New-Item -ItemType Directory -Path $HELIX_CONFIG_DIR -Force | Out-Null
        }

        Write-Info "Deploying runtime directory to: $destRuntime"
        Copy-Item -Path $srcRuntime -Destination $destRuntime -Recurse -Force

    } finally {
        # 임시 다운로드 파일 및 압축 해제 디렉토리 정리
        if (Test-Path $tmpDir) {
            Remove-Item -Path $tmpDir -Recurse -Force -ErrorAction SilentlyContinue | Out-Null
        }
    }

    # 8) PATH 환경 변수 영구 등록
    if ($AddToPath) {
        # 현재 세션 PATH 반영
        if ($env:Path -notlike "*$InstallDir*") {
            $env:Path = "$InstallDir;$env:Path"
            Write-Info "Temporarily added $InstallDir to current session PATH."
        }

        # 사용자 환경 변수 PATH 반영
        $userPath = [System.Environment]::GetEnvironmentVariable('Path', 'User')
        if ($userPath -notlike "*$InstallDir*") {
            [System.Environment]::SetEnvironmentVariable('Path', "$InstallDir;$userPath", 'User')
            Write-Success "Permanently added $InstallDir to User PATH."
            Write-Warn "Please restart your terminal window to apply the updated PATH environment variable."
        } else {
            Write-Info "$InstallDir is already registered in User PATH."
        }
    }

    # 9) 최종 설치 완료 확인 및 검증
    if (Test-Path $destExePath) {
        Write-Host ""
        Write-Host "==================================================" -ForegroundColor Green
        Write-Success "Helix Editor ($tagName) installation completed successfully!"
        Write-Host "==================================================" -ForegroundColor Green
        Write-Info "Run command: hx"
        Write-Info "Config directory: $HELIX_CONFIG_DIR"
        Write-Info "Runtime directory: $destRuntime"
        Write-Host ""
        Write-Info "Quick Vim-like shortcuts inside Helix:"
        Write-Info "  :q              - Quit"
        Write-Info "  :w              - Save"
        Write-Info "  i               - Enter Insert mode"
        Write-Info "  Esc             - Back to Normal mode"
        Write-Info "  hx --health     - Check Helix system health"
    } else {
        Write-Err "Installation failed. hx.exe could not be verified at: $destExePath"
    }
}

# 예기치 못한 전체 프로세스 에러 감지를 위한 Trap 설정
trap {
    Write-Err "An unexpected error occurred during installation: $_"
}

Main