#!/bin/bash
set -e

# ==========================================
# 统一构建脚本 (CI Build Script)
# 功能：自动检测环境、安装 Node.js (不依赖系统预装)、构建项目、打包产物
# 解决：Runner 环境缺失 Node/Docker/Python 等工具导致的问题
# ==========================================

# 配置节点版本
NODE_VERSION="20.10.0"
DIST_FILE="site_dist.tgz"

echo ">>> [Init] Starting CI Build Script..."

# ----------------------------------------------------------------
# 1. 基础工具检测与安装 (curl, tar, xz)
# ----------------------------------------------------------------
ensure_tools() {
    echo ">>> [Tools] Checking basic tools..."
    local missing_tools=()
    
    for tool in curl tar xz; do
        if ! command -v "$tool" &> /dev/null; then
            missing_tools+=("$tool")
        fi
    done

    if [ ${#missing_tools[@]} -eq 0 ]; then
        echo "    All tools present."
        return 0
    fi

    echo "    Missing tools: ${missing_tools[*]}. Attempting installation..."
    
    if command -v apk &> /dev/null; then
        apk add --no-cache curl tar xz
    elif command -v apt-get &> /dev/null; then
        apt-get update && apt-get install -y curl tar xz-utils
    elif command -v yum &> /dev/null; then
        yum install -y curl tar xz
    elif command -v dnf &> /dev/null; then
        dnf install -y curl tar xz
    elif command -v zypper &> /dev/null; then
        zypper install -y curl tar xz
    else
        echo "!!! Error: Cannot install missing tools. No known package manager found."
        exit 1
    fi
}

# ----------------------------------------------------------------
# 2. Node.js 独立环境安装 (Binary Mode)
# ----------------------------------------------------------------
install_node() {
    echo ">>> [Node] Setting up Node.js v${NODE_VERSION}..."
    
    # 如果已经有可用的 node 环境且版本匹配，则跳过（可选，为了稳健这里强制使用独立环境）
    # export PATH="$PWD/node_env/bin:$PATH" 
    
    # 检测架构
    local arch=$(uname -m)
    local node_arch=""
    case "$arch" in
        x86_64) node_arch="x64" ;;
        aarch64) node_arch="arm64" ;;
        *) echo "!!! Error: Unsupported architecture: $arch"; exit 1 ;;
    esac

    # 检测 Libc (glibc vs musl)
    local libc_type="glibc"
    if ldd --version 2>&1 | grep -q "musl"; then
        libc_type="musl"
    elif [ -f /etc/alpine-release ]; then
        libc_type="musl"
    fi
    echo "    Detected System: Linux ${node_arch} (${libc_type})"

    # 构建下载 URL
    # Official URL pattern: https://nodejs.org/dist/vX.Y.Z/node-vX.Y.Z-linux-ARCH[-musl].tar.xz
    local url_suffix=""
    if [ "$libc_type" == "musl" ]; then
        url_suffix="-musl"
    fi
    
    local tar_name="node-v${NODE_VERSION}-linux-${node_arch}${url_suffix}.tar.xz"
    local download_url="https://nodejs.org/dist/v${NODE_VERSION}/${tar_name}"
    
    echo "    Downloading: ${download_url}"
    
    mkdir -p node_env
    
    # 下载并解压
    if ! curl -fSL "$download_url" -o "$tar_name"; then
        echo "!!! Error: Failed to download Node.js binary."
        echo "    Please check if version v${NODE_VERSION} supports ${node_arch}-${libc_type}."
        exit 1
    fi
    
    echo "    Extracting..."
    tar -xJf "$tar_name" -C node_env --strip-components=1
    rm "$tar_name"

    # 设置环境变量
    export PATH="$PWD/node_env/bin:$PATH"
    
    if ! command -v node &> /dev/null; then
        echo "!!! Error: Node.js installation failed. 'node' command not found."
        exit 1
    fi
    
    echo "    Node version: $(node -v)"
    echo "    Npm version: $(npm -v)"
}

# ----------------------------------------------------------------
# 3. 项目构建与打包
# ----------------------------------------------------------------
build_project() {
    echo ">>> [Build] Starting project build..."
    
    # 注入环境变量 (从 CI 环境传递)
    if [ -n "$VITE_APP_BASE_URL" ]; then
        echo "    Setting VITE_APP_BASE_URL=${VITE_APP_BASE_URL}"
        echo "VITE_APP_BASE_URL=${VITE_APP_BASE_URL}" > .env.prod
    fi

    echo "    Installing dependencies..."
    npm ci --quiet

    echo "    Building..."
    npm run build:prod

    echo ">>> [Package] Compressing artifacts..."
    if [ ! -d "dist" ]; then
        echo "!!! Error: 'dist' directory not found after build."
        exit 1
    fi

    # 直接打包 dist 目录下的内容，解压时直接释放文件
    tar -C dist -czf "$DIST_FILE" .
    
    echo "    Success! Artifact created: $DIST_FILE"
    ls -lh "$DIST_FILE"
}

# ==========================================
# Main Execution Flow
# ==========================================
ensure_tools
install_node
build_project