#!/bin/bash

# Java 17 安装脚本
# 提供多个下载源选项

set -e

JAVA_VERSION="17.0.12"
JAVA_DIR="/opt/java17"
INSTALL_DIR="$HOME"

echo "=========================================="
echo "Java 17 安装脚本"
echo "=========================================="

# 检查是否已安装 Java 17
if [ -d "$JAVA_DIR" ] && [ -f "$JAVA_DIR/bin/java" ]; then
    CURRENT_VERSION=$($JAVA_DIR/bin/java -version 2>&1 | head -1)
    if echo "$CURRENT_VERSION" | grep -q "17"; then
        echo "Java 17 已安装: $CURRENT_VERSION"
        echo "配置为默认版本..."
        sudo alternatives --install /usr/bin/java java $JAVA_DIR/bin/java 2
        sudo alternatives --install /usr/bin/javac javac $JAVA_DIR/bin/javac 2
        sudo alternatives --config java <<< "2"
        java -version
        exit 0
    fi
fi

# 下载选项
echo "请选择下载源："
echo "1. GitHub (Adoptium) - 需要良好的网络连接"
echo "2. 手动下载后安装"
echo "3. 使用系统包管理器（如果可用）"
read -p "请选择 (1-3): " choice

case $choice in
    1)
        echo "正在从 GitHub 下载 Java 17..."
        cd $INSTALL_DIR
        URL="https://github.com/adoptium/temurin17-binaries/releases/download/jdk-${JAVA_VERSION}%2B7/OpenJDK17U-jdk_x64_linux_hotspot_${JAVA_VERSION}_7.tar.gz"
        wget "$URL" -O java17.tar.gz || {
            echo "下载失败，请尝试其他选项"
            exit 1
        }
        ;;
    2)
        echo "请手动下载 Java 17 并保存为 java17.tar.gz"
        echo "下载地址: https://adoptium.net/zh-CN/temurin/releases/?version=17"
        read -p "下载完成后，请将文件放在 $INSTALL_DIR/java17.tar.gz，然后按回车继续..."
        if [ ! -f "$INSTALL_DIR/java17.tar.gz" ]; then
            echo "错误: 未找到 java17.tar.gz 文件"
            exit 1
        fi
        ;;
    3)
        echo "尝试使用系统包管理器..."
        # 检查是否有可用的 Java 17 包
        if yum list available | grep -q "java-17"; then
            sudo yum install -y java-17-openjdk java-17-openjdk-devel
            sudo alternatives --config java
            java -version
            exit 0
        else
            echo "系统仓库中没有 Java 17，请选择其他选项"
            exit 1
        fi
        ;;
    *)
        echo "无效选择"
        exit 1
        ;;
esac

# 解压和安装
echo "正在解压..."
cd $INSTALL_DIR
tar -xzf java17.tar.gz

echo "正在安装到 $JAVA_DIR..."
sudo mkdir -p $JAVA_DIR
sudo mv jdk-${JAVA_VERSION}+7/* $JAVA_DIR/
sudo chown -R root:root $JAVA_DIR

# 配置 alternatives
echo "配置 Java 17 为默认版本..."
sudo alternatives --install /usr/bin/java java $JAVA_DIR/bin/java 2
sudo alternatives --install /usr/bin/javac javac $JAVA_DIR/bin/javac 2

# 选择 Java 17
echo "2" | sudo alternatives --config java > /dev/null 2>&1 || {
    echo "请手动选择 Java 17:"
    sudo alternatives --config java
}

# 验证安装
echo ""
echo "=========================================="
echo "安装完成！"
echo "=========================================="
java -version
echo ""
echo "Java 17 已安装到: $JAVA_DIR"
echo "现在可以继续安装 Gerrit 了！"