#!/bin/bash
# 智能项目定价模型 - 生产环境部署脚本
# 遵循瑞小美部署规范

set -e

# 颜色输出
RED='\033[0;31m'
GREEN='\033[0;32m'
YELLOW='\033[1;33m'
NC='\033[0m'

log_info() {
    echo -e "${GREEN}[INFO]${NC} $1"
}

log_warn() {
    echo -e "${YELLOW}[WARN]${NC} $1"
}

log_error() {
    echo -e "${RED}[ERROR]${NC} $1"
}

# 检查必要命令
check_requirements() {
    log_info "检查环境依赖..."
    
    local requirements=("docker" "docker-compose")
    for cmd in "${requirements[@]}"; do
        if ! command -v $cmd &> /dev/null; then
            log_error "$cmd 未安装"
            exit 1
        fi
    done
    
    log_info "环境检查通过"
}

# 检查 .env 文件
check_env_file() {
    log_info "检查环境配置..."
    
    if [ ! -f ".env" ]; then
        log_error ".env 文件不存在，请从 env.example 复制并配置"
        log_info "执行: cp env.example .env && chmod 600 .env"
        exit 1
    fi
    
    # 检查 .env 文件权限
    local perms=$(stat -c %a .env 2>/dev/null || stat -f %OLp .env 2>/dev/null)
    if [ "$perms" != "600" ]; then
        log_warn ".env 文件权限不是 600，正在修复..."
        chmod 600 .env
    fi
    
    # 检查必要配置项
    local required_vars=("DATABASE_URL" "MYSQL_ROOT_PASSWORD" "MYSQL_PASSWORD" "SECRET_KEY")
    source .env
    
    for var in "${required_vars[@]}"; do
        if [ -z "${!var}" ]; then
            log_error "缺少必要配置: $var"
            exit 1
        fi
    done
    
    # 检查是否修改了默认密码
    if [[ "$SECRET_KEY" == *"change-in-production"* ]]; then
        log_error "请修改 SECRET_KEY 为随机字符串"
        exit 1
    fi
    
    log_info "配置检查通过"
}

# 检查网络
check_network() {
    log_info "检查 Docker 网络..."
    
    # 检查 scrm_network 是否存在
    if ! docker network ls | grep -q "scrm_network"; then
        log_info "创建 scrm_network 网络..."
        docker network create scrm_network
    fi
    
    log_info "网络检查通过"
}

# 拉取/构建镜像
build_images() {
    log_info "构建 Docker 镜像..."
    
    docker-compose build --no-cache
    
    log_info "镜像构建完成"
}

# 停止旧服务
stop_services() {
    log_info "停止旧服务..."
    
    docker-compose down --remove-orphans 2>/dev/null || true
    
    log_info "旧服务已停止"
}

# 启动服务
start_services() {
    log_info "启动服务..."
    
    docker-compose up -d
    
    log_info "服务启动中..."
}

# 等待服务就绪
wait_for_services() {
    log_info "等待服务就绪..."
    
    local max_attempts=30
    local attempt=0
    
    # 等待后端健康检查
    while [ $attempt -lt $max_attempts ]; do
        if docker-compose exec -T pricing-backend curl -sf http://localhost:8000/health > /dev/null 2>&1; then
            log_info "后端服务就绪"
            break
        fi
        attempt=$((attempt + 1))
        echo -n "."
        sleep 2
    done
    
    if [ $attempt -eq $max_attempts ]; then
        log_error "服务启动超时"
        docker-compose logs --tail=50
        exit 1
    fi
    
    echo ""
}

# 刷新 Nginx DNS 缓存
refresh_nginx() {
    log_info "刷新 Nginx DNS 缓存..."
    
    # 检查 nginx_proxy 容器是否存在
    if docker ps | grep -q "nginx_proxy"; then
        docker exec nginx_proxy nginx -s reload 2>/dev/null || log_warn "Nginx reload 失败，请手动执行"
    else
        log_warn "nginx_proxy 容器未运行，请确保 Nginx 配置正确"
    fi
}

# 显示服务状态
show_status() {
    log_info "服务状态:"
    echo ""
    docker-compose ps
    echo ""
    
    log_info "健康检查:"
    curl -sf http://localhost:8000/health 2>/dev/null && echo "" || log_warn "后端服务不可访问"
    
    echo ""
    log_info "部署完成!"
    echo ""
    echo "访问地址:"
    echo "  - 前端: https://pricing.example.com (需配置 Nginx)"
    echo "  - 后端 API: http://localhost:8000"
    echo "  - API 文档: http://localhost:8000/docs (仅开发环境)"
}

# 回滚
rollback() {
    log_warn "执行回滚..."
    docker-compose down
    
    # 如果有备份，恢复
    if [ -f ".env.backup" ]; then
        mv .env.backup .env
    fi
    
    log_info "回滚完成，请检查日志排查问题"
}

# 主函数
main() {
    local action="${1:-deploy}"
    
    cd "$(dirname "$0")/.."
    
    case $action in
        deploy)
            log_info "开始部署智能项目定价模型..."
            echo ""
            
            check_requirements
            check_env_file
            check_network
            build_images
            stop_services
            start_services
            wait_for_services
            refresh_nginx
            show_status
            ;;
        
        restart)
            log_info "重启服务..."
            docker-compose restart
            wait_for_services
            refresh_nginx
            show_status
            ;;
        
        stop)
            log_info "停止服务..."
            docker-compose down
            log_info "服务已停止"
            ;;
        
        status)
            show_status
            ;;
        
        logs)
            docker-compose logs -f --tail=100
            ;;
        
        rollback)
            rollback
            ;;
        
        *)
            echo "用法: $0 {deploy|restart|stop|status|logs|rollback}"
            exit 1
            ;;
    esac
}

# 捕获错误
trap 'log_error "部署失败"; exit 1' ERR

main "$@"