<#
Windows PowerShell script to install Maven 3.6.x+ (binary) on Windows.
This script downloads the binary, extracts it, sets MAVEN_HOME and PATH for the user,
and verifies mvn -version. ASCII-only messages to minimize encoding issues.
Usage:
  powershell -ExecutionPolicy Bypass -File scripts/install_maven.ps1 -Version 3.6.3
  powershell -ExecutionPolicy Bypass -File scripts/install_maven.ps1 -Version latest
Notes:
- Version must be a specific 3.6.x (currently supports 3.6.3).
- InstallDir defaults to C:\Program Files\Maven.
- ApiKey is accepted for future use; not used by Maven itself.
"""
#> 

param(
  [ValidateSet("latest","3.6.3")]
  [string]$Version = "3.6.3",
  [string]$InstallDir = "C:\\Program Files\\Maven",
  [string]$ApiKey = $null
)

$ErrorActionPreference = "Stop"

Write-Host "Installing Maven..."

if (-Not (Test-Path $InstallDir)) {
  try {
    New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null
  } catch {
    $InstallDir = Join-Path $env:USERPROFILE "maven"
    if (-Not (Test-Path $InstallDir)) {
      New-Item -ItemType Directory -Path $InstallDir -Force | Out-Null
    }
  }
}

if ($Version -eq "latest") {
  Write-Error "Latest version not auto-resolved in this script. Please specify 3.6.3."
  exit 1
}

$zipName = "apache-maven-$Version-bin.zip"
$url = "https://archive.apache.org/dist/maven/maven-3/$Version/binaries/$zipName"
$tempZip = Join-Path $env:TEMP $zipName
$destDir = Join-Path $InstallDir "apache-maven-$Version"

if (Test-Path $destDir) {
  Write-Host "Maven already installed at $destDir"; exit 0
}

Write-Host "Downloading Maven $Version..."
$maxRetries = 3
$attempt = 0
while ($attempt -lt $maxRetries) {
  try {
    Invoke-WebRequest -Uri $url -OutFile $tempZip -ErrorAction Stop
    break
  } catch {
    $attempt++
    if ($attempt -ge $maxRetries) {
      Write-Error "Failed to download Maven after $maxRetries attempts. Please check network and proxy settings."
      exit 1
    }
    Write-Warning "Download failed. Retrying ($attempt/$maxRetries)..."
    Start-Sleep -Seconds 5
  }
}

Write-Host "Extracting to $InstallDir..."
Expand-Archive -Path $tempZip -DestinationPath $InstallDir -Force

$mavenHome = (Join-Path $InstallDir "apache-maven-$Version").TrimEnd('\\')
if (-Not (Test-Path $mavenHome)) {
  Write-Error "Extraction failed: Maven directory not found: $mavenHome"
  exit 1
}

# Set MAVEN_HOME and PATH (user scope)
Write-Host "Configuring environment variables..."
[Environment]::SetEnvironmentVariable("MAVEN_HOME", $mavenHome, [EnvironmentVariableTarget]::User)
 $binPath = Join-Path $mavenHome "bin"
 $sep = [System.IO.Path]::PathSeparator
 $pathValue = [Environment]::GetEnvironmentVariable("PATH", [EnvironmentVariableTarget]::User)
 if (-not ($pathValue -and $pathValue -like "*$binPath*")) {
   if (-not $pathValue) { $newPath = $binPath } else { $newPath = $pathValue + $sep + $binPath }
   [Environment]::SetEnvironmentVariable("PATH", $newPath, [EnvironmentVariableTarget]::User)
   Write-Host "PATH updated to include $binPath"
 } else {
   Write-Host "PATH already includes Maven bin: $binPath"
 }

Write-Host "Verifying mvn version..."
try {
  $mvnVer = & "$mavenHome\\bin\\mvn" -version
  Write-Host $mvnVer
} catch {
  Write-Error "Could not run mvn. Ensure PATH is set correctly and reopen a new terminal."
  exit 1
}

Write-Host "Maven installation complete."

if (-not [string]::IsNullOrEmpty($ApiKey)) {
  Write-Host "Note: API key provided, but not used by Maven."
}

Exit 0