-- 常见问题管理缺表修复
-- 报错示例：Object 'sys_faq' not found within 'charging_pile_other'
-- 请在 charging_pile_other 库执行；脚本可重复执行，不会删除已有数据。

USE `charging_pile_other`;

CREATE TABLE IF NOT EXISTS `sys_faq` (
  `faq_id` bigint NOT NULL AUTO_INCREMENT COMMENT '问题ID',
  `question` varchar(500) NOT NULL COMMENT '问题标题',
  `answer` text COMMENT '问题答案',
  `video_url` varchar(500) DEFAULT NULL COMMENT '视频教程URL',
  `sort_order` int DEFAULT '0' COMMENT '排序号',
  `status` char(1) DEFAULT '0' COMMENT '状态（0正常 1停用）',
  `create_by` varchar(64) DEFAULT '' COMMENT '创建者',
  `create_time` datetime DEFAULT NULL COMMENT '创建时间',
  `update_by` varchar(64) DEFAULT '' COMMENT '更新者',
  `update_time` datetime DEFAULT NULL COMMENT '更新时间',
  `remark` varchar(500) DEFAULT NULL COMMENT '备注',
  `del_flag` char(1) DEFAULT '0' COMMENT '删除标志（0代表存在 2代表删除）',
  PRIMARY KEY (`faq_id`),
  KEY `idx_sys_faq_status_del` (`status`, `del_flag`),
  KEY `idx_sys_faq_sort` (`sort_order`)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci COMMENT='常见问题表';

SET @faq_video_url_col_exists := (
  SELECT COUNT(1)
  FROM information_schema.COLUMNS
  WHERE TABLE_SCHEMA = DATABASE()
    AND TABLE_NAME = 'sys_faq'
    AND COLUMN_NAME = 'video_url'
);

SET @faq_add_video_url_sql := IF(
  @faq_video_url_col_exists = 0,
  'ALTER TABLE `sys_faq` ADD COLUMN `video_url` varchar(500) DEFAULT NULL COMMENT ''视频教程URL'' AFTER `answer`',
  'SELECT 1'
);

PREPARE faq_add_video_url_stmt FROM @faq_add_video_url_sql;
EXECUTE faq_add_video_url_stmt;
DEALLOCATE PREPARE faq_add_video_url_stmt;

INSERT INTO `sys_faq` (
  `question`,
  `answer`,
  `sort_order`,
  `status`,
  `create_by`,
  `create_time`,
  `del_flag`
)
SELECT
  '如何使用充电桩？',
  '1. 停好车辆；2. 扫码启动充电桩；3. 连接充电枪；4. 开始充电。',
  1,
  '0',
  'admin',
  NOW(),
  '0'
WHERE NOT EXISTS (
  SELECT 1 FROM `sys_faq` WHERE `question` = '如何使用充电桩？' AND `del_flag` = '0'
);

INSERT INTO `sys_faq` (
  `question`,
  `answer`,
  `sort_order`,
  `status`,
  `create_by`,
  `create_time`,
  `del_flag`
)
SELECT
  '充电费用如何计算？',
  '充电费用=充电电量×电价+服务费，具体以实际订单为准。',
  2,
  '0',
  'admin',
  NOW(),
  '0'
WHERE NOT EXISTS (
  SELECT 1 FROM `sys_faq` WHERE `question` = '充电费用如何计算？' AND `del_flag` = '0'
);

INSERT INTO `sys_faq` (
  `question`,
  `answer`,
  `sort_order`,
  `status`,
  `create_by`,
  `create_time`,
  `del_flag`
)
SELECT
  '充电过程中可以拔枪吗？',
  '充电过程中请勿随意拔枪，如需停止充电请先在APP或充电桩上停止充电后再拔枪。',
  3,
  '0',
  'admin',
  NOW(),
  '0'
WHERE NOT EXISTS (
  SELECT 1 FROM `sys_faq` WHERE `question` = '充电过程中可以拔枪吗？' AND `del_flag` = '0'
);