#!/bin/bash
# Debezium Outbox Connectors 注册脚本（v2.1 M0.5）
#
# 功能：
# - 向 Debezium Connect 注册 outbox 表的 CDC connector
# - 监听 next_edu_cloud 数据库的 4 张 outbox 表
# - 使用 ExtractNewRecordState SMT 简化事件格式
# - 使用 TopicRouter SMT 根据 event_type 字段路由到业务 topic
#
# 使用：
#   bash infra/debezium/register-outbox-connectors.sh
#
# 前置条件：
# - Debezium Connect 已启动（端口 8083）
# - MySQL binlog 已启用（row mode）
# - outbox 表已存在
#
# v2.1 设计（见 §5.4 / §6.1 / ADR-032）：
# - 业务代码只写业务表 + Outbox 表（事务内原子）
# - Debezium 监听 binlog 自动投递（Transaction Log Tailing）
# - 废弃 OutboxPublisher 轮询线程
# - 保证 at-least-once 语义（Debezium offset 管理）

set -euo pipefail

DEBEZIUM_HOST="${DEBEZIUM_HOST:-localhost}"
DEBEZIUM_PORT="${DEBEZIUM_PORT:-8083}"
DEBEZIUM_URL="http://${DEBEZIUM_HOST}:${DEBEZIUM_PORT}"

MYSQL_HOST="${MYSQL_HOST:-edu-mysql}"
MYSQL_PORT="${MYSQL_PORT:-3306}"
MYSQL_USER="${MYSQL_USER:-debezium}"
MYSQL_PASSWORD="${MYSQL_PASSWORD:-debezium}"

CONNECTORS_DIR="$(dirname "$0")/connectors"

echo "=== Debezium Outbox Connector 注册（v2.1） ==="
echo "目标：${DEBEZIUM_URL}"
echo "MySQL：${MYSQL_HOST}:${MYSQL_PORT}"
echo ""

# 等待 Debezium Connect 就绪
echo "等待 Debezium Connect 就绪..."
for i in $(seq 1 30); do
  if curl -sf "${DEBEZIUM_URL}/connectors" > /dev/null 2>&1; then
    echo "✓ Debezium Connect 就绪"
    break
  fi
  echo "  尝试 ${i}/30..."
  sleep 2
done

# 注册所有 connector
for connector_file in "${CONNECTORS_DIR}"/*.json; do
  if [ ! -f "$connector_file" ]; then
    echo "⚠ 无 connector 配置文件"
    exit 0
  fi

  connector_name=$(basename "$connector_file" .json)
  echo ""
  echo "注册 connector: ${connector_name}"

  # 替换占位符为环境变量值
  config_payload=$(sed \
    -e "s|MYSQL_HOST_PLACEHOLDER|${MYSQL_HOST}|g" \
    -e "s|MYSQL_PORT_PLACEHOLDER|${MYSQL_PORT}|g" \
    -e "s|MYSQL_USER_PLACEHOLDER|${MYSQL_USER}|g" \
    -e "s|MYSQL_PASSWORD_PLACEHOLDER|${MYSQL_PASSWORD}|g" \
    "$connector_file")

  # 检查是否已存在
  if curl -sf "${DEBEZIUM_URL}/connectors/${connector_name}" > /dev/null 2>&1; then
    echo "  ⚠ 已存在，更新配置..."
    echo "$config_payload" | curl -sX PUT "${DEBEZIUM_URL}/connectors/${connector_name}/config" \
      -H "Content-Type: application/json" \
      -d @- | jq .
  else
    # 包装为创建请求
    payload=$(jq -n --arg name "$connector_name" --argjson config "$config_payload" \
      '{name: $name, config: $config}')
    echo "$payload" | curl -sX POST "${DEBEZIUM_URL}/connectors" \
      -H "Content-Type: application/json" \
      -d @- | jq .
  fi

  echo "  ✓ ${connector_name} 已注册"
done

echo ""
echo "=== 注册完成 ==="
echo ""
echo "查看 connector 状态："
echo "  curl ${DEBEZIUM_URL}/connectors"
echo "  curl ${DEBEZIUM_URL}/connectors/<name>/status"
echo ""
echo "删除 connector："
echo "  curl -X DELETE ${DEBEZIUM_URL}/connectors/<name>"