#!/usr/bin/env bash
set -euo pipefail

# ============================================================
# PR-Helper 一键部署脚本 (Ubuntu/Debian, 国内镜像加速)
# ============================================================

RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m' # No Color

info()  { echo -e "${GREEN}[INFO]${NC} $*"; }
warn()  { echo -e "${YELLOW}[WARN]${NC} $*"; }
error() { echo -e "${RED}[ERROR]${NC} $*"; exit 1; }

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$SCRIPT_DIR"

# ----------------------------------------------------------
# 1. 拉取最新代码
# ----------------------------------------------------------
pull_latest() {
    info "拉取最新代码..."
    git pull --rebase || warn "git pull 失败，将使用本地代码继续构建"
}

# ----------------------------------------------------------
# 2. 检查 Docker 环境
# ----------------------------------------------------------
check_docker() {
    if ! command -v docker &>/dev/null; then
        error "未检测到 Docker，请先安装 Docker"
    fi
    if ! docker compose version &>/dev/null && ! docker-compose version &>/dev/null; then
        error "未检测到 Docker Compose，请先安装 Docker Compose 插件"
    fi
    info "Docker 环境检查通过"
}

# ----------------------------------------------------------
# 3. 配置 Docker 国内镜像加速
# ----------------------------------------------------------
setup_docker_mirror() {
    local daemon_json="/etc/docker/daemon.json"
    local mirror='{
  "registry-mirrors": [
    "https://docker.1ms.run",
    "https://docker.xuanyuan.me",
    "https://docker.m.daocloud.io"
  ]
}'

    if [ -f "$daemon_json" ]; then
        if grep -q "registry-mirrors" "$daemon_json"; then
            warn "Docker 镜像加速已配置，跳过"
            return
        fi
        warn "已存在 daemon.json，备份后追加镜像配置"
        sudo cp "$daemon_json" "${daemon_json}.bak.$(date +%s)"
    fi

    info "配置 Docker 国内镜像加速..."
    echo "$mirror" | sudo tee "$daemon_json" > /dev/null
    sudo systemctl daemon-reload
    sudo systemctl restart docker
    info "Docker 镜像加速配置完成"
}

# ----------------------------------------------------------
# 4. 读取 .env 配置文件
# ----------------------------------------------------------
load_env() {
    if [ ! -f ".env" ]; then
        error ".env 文件不存在，请先执行: cp .env.example .env 并填写配置"
    fi

    info "读取 .env 配置..."
    set -a
    # shellcheck disable=SC1091
    source .env
    set +a

    # 端口默认值
    export PORT="${PORT:-8080}"

    info "服务端口: ${PORT}"
    info "MySQL: ${MYSQL_USER}@${MYSQL_HOST}:${MYSQL_PORT}/${MYSQL_DATABASE}"
}

# ----------------------------------------------------------
# 5. 构建并启动服务
# ----------------------------------------------------------
build_and_start() {
    info "构建 Docker 镜像（首次可能需要几分钟）..."
    docker compose build

    info "启动服务..."
    docker compose up -d

    info "等待应用启动..."
    sleep 3

    if docker compose ps | grep -q "running\|Up"; then
        info "=========================================="
        info "  PR-Helper 部署成功！"
        info "=========================================="
        info "访问地址: http://$(hostname -I | awk '{print $1}'):${PORT}"
        info "本地访问: http://localhost:${PORT}"
        info ""
        info "常用命令:"
        info "  查看日志:  docker compose logs -f"
        info "  停止服务:  docker compose down"
        info "  重启服务:  docker compose restart"
        info "=========================================="
    else
        error "服务启动失败，请查看日志: docker compose logs"
    fi
}

# ----------------------------------------------------------
# 主流程
# ----------------------------------------------------------
main() {
    info "开始部署 PR-Helper..."

    pull_latest
    check_docker
    setup_docker_mirror
    load_env
    build_and_start
}

main "$@"