# 在当前 PowerShell 会话中加载 JDK 17 + Maven
# 用法：. <仓库根>\tools\env-java.ps1
#
# 查找顺序：
#   1) 仓库内便携工具链  tools\jdk17\*  + tools\maven\apache-maven-3.9.9（不入库，换机器需自备）
#   2) 已导出的环境变量  $env:JAVA_HOME / $env:MAVEN_HOME
#   3) PATH 上的 java / mvn（例：scoop/choco/winget 安装的）
$ErrorActionPreference = 'Stop'

$projectRoot = Split-Path -Parent $PSScriptRoot

function Find-Jdk {
    $root = Join-Path $projectRoot 'tools\jdk17'
    $candidates = @()
    if (Test-Path $root) {
        $candidates += $root
        $candidates += Get-ChildItem $root -Directory -ErrorAction SilentlyContinue | ForEach-Object { $_.FullName }
    }
    if ($env:JAVA_HOME) { $candidates += $env:JAVA_HOME }
    return $candidates | Where-Object { $_ -and (Test-Path (Join-Path $_ 'bin\java.exe')) } | Select-Object -First 1
}

function Find-Maven {
    $portable = Join-Path $projectRoot 'tools\maven\apache-maven-3.9.9'
    if (Test-Path (Join-Path $portable 'bin\mvn.cmd')) { return $portable }
    if ($env:MAVEN_HOME -and (Test-Path (Join-Path $env:MAVEN_HOME 'bin\mvn.cmd'))) { return $env:MAVEN_HOME }
    $onPath = Get-Command mvn -ErrorAction SilentlyContinue
    if ($onPath) { return Split-Path -Parent (Split-Path -Parent $onPath.Source) }
    return $null
}

$jdkHome = Find-Jdk
if (-not $jdkHome) {
    throw "找不到 JDK 17：请安装 JDK 17 并设置 JAVA_HOME，或把便携版放到 tools\jdk17\"
}

$mavenHome = Find-Maven
if (-not $mavenHome) {
    throw "找不到 Maven：请安装 Maven 3.9+ 并放到 PATH，或放便携版到 tools\maven\apache-maven-3.9.9"
}

$env:JAVA_HOME = $jdkHome
$env:MAVEN_HOME = $mavenHome
$env:PATH = "$jdkHome\bin;$mavenHome\bin;$env:PATH"

Write-Host "JAVA_HOME=$env:JAVA_HOME"
Write-Host "MAVEN_HOME=$env:MAVEN_HOME"
# java/mvn 往 stderr 写版本信息，在 ErrorActionPreference=Stop 下会被当成终止错误，这里放宽
$ErrorActionPreference = 'Continue'
java -version
mvn -version