-- ==============================================================================
-- RailwaySystem V2 -> MySQL 5.7 结构对账脚本 (reconcile_mysql_5_7.sql)
-- 适用数据库: MySQL 5.7 (线上部署库)
-- 目标: 将线上 MySQL 表结构对齐 V2 基线，消除两类反复出现的错误:
--        1) Field 'create_time' doesn't have a default value
--        2) Unknown column 'xxx' in 'field list' (缺失列)
-- 说明:
--   * 本脚本只"设置默认值 / 按需补列"，**不改列类型**，对已有默认值的列为幂等操作。
--   * 使用 information_schema 守卫，列已存在/已有默认也不会报错，可重复执行。
--   * train_class_report 的 alloc_* 列: 应用当前 mapper 仍在 SELECT，故补回；
--     若后续按最终 V2 设计改为依赖 train_dorm_auth，应同步清理应用侧(见文件末尾说明)。
-- 执行: mysql -u<user> -p<pass> railwaysystem < reconcile_mysql_5_7.sql
-- ==============================================================================

DELIMITER $$

-- 仅当列存在时设置默认值(列名/表名已存在即可，重复设置同值幂等)
DROP PROCEDURE IF EXISTS set_default_if_missing $$
CREATE PROCEDURE set_default_if_missing(
    IN p_tbl VARCHAR(64), IN p_col VARCHAR(64), IN p_def VARCHAR(255)
)
BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_schema = DATABASE() AND table_name = p_tbl AND column_name = p_col
    ) THEN
        SET @stmt = CONCAT('ALTER TABLE `', p_tbl, '` ALTER COLUMN `', p_col, '` SET DEFAULT ', p_def);
        PREPARE s FROM @stmt;
        EXECUTE s;
        DEALLOCATE PREPARE s;
    END IF;
END $$

-- 仅当列不存在时新增列
DROP PROCEDURE IF EXISTS add_col_if_missing $$
CREATE PROCEDURE add_col_if_missing(
    IN p_tbl VARCHAR(64), IN p_col VARCHAR(64), IN p_spec VARCHAR(255)
)
BEGIN
    IF NOT EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_schema = DATABASE() AND table_name = p_tbl AND column_name = p_col
    ) THEN
        SET @stmt = CONCAT('ALTER TABLE `', p_tbl, '` ADD COLUMN `', p_col, '` ', p_spec);
        PREPARE s FROM @stmt;
        EXECUTE s;
        DEALLOCATE PREPARE s;
    END IF;
END $$

DELIMITER ;

-- ------------------------------------------------------------------------------
-- 1) train_class_report: 补齐应用 mapper 仍在 SELECT 的 alloc_* 列 (若已加则跳过)
-- ------------------------------------------------------------------------------
CALL add_col_if_missing('train_class_report', 'alloc_dorm_id',      'VARCHAR(32) NULL');
CALL add_col_if_missing('train_class_report', 'alloc_classroom_id', 'VARCHAR(32) NULL');
CALL add_col_if_missing('train_class_report', 'alloc_site_id',      'VARCHAR(32) NULL');

-- ------------------------------------------------------------------------------
-- 2) 为所有 V2 业务表的 create_time 补默认值 (核心: 消除当前 'doesn''t have a default value')
--    V2 基线均为 TIMESTAMP NOT NULL DEFAULT CURRENT_TIMESTAMP，线上 5.7 翻译时丢失。
-- ------------------------------------------------------------------------------
CALL set_default_if_missing('train_resource',          'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_course_resource',   'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_plan_course',       'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_enrollment',        'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_lesson',            'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_accommodation',     'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_score_item',        'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_student_score',     'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_class_report',      'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_dorm_auth',         'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_student_checkin',   'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_study_duration',    'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_student_portrait',  'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_electronic_board',  'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_classroom_info',    'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_training_site',     'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_dormitory_info',    'create_time', 'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_class_plan',        'create_time', 'CURRENT_TIMESTAMP');

-- ------------------------------------------------------------------------------
-- 3) 其它 V2 中 NOT NULL 且带默认值、但线上可能丢失的列
-- ------------------------------------------------------------------------------
CALL set_default_if_missing('train_resource',       'status',          '1');
CALL set_default_if_missing('train_resource',       'del_flag',        '''0''');
CALL set_default_if_missing('train_enrollment',     'enrollment_status', '0');
CALL set_default_if_missing('train_accommodation',  'assigned_time',    'CURRENT_TIMESTAMP');
CALL set_default_if_missing('train_accommodation',  'accommodation_status', '0');
CALL set_default_if_missing('train_score_item',     'item_type',       '1');
CALL set_default_if_missing('train_score_item',     'weight',          '0.00');
CALL set_default_if_missing('train_score_item',     'full_score',      '100.00');
CALL set_default_if_missing('train_student_score',  'import_time',     'CURRENT_TIMESTAMP');

-- ------------------------------------------------------------------------------
-- 清理临时存储过程
-- ------------------------------------------------------------------------------
DROP PROCEDURE IF EXISTS set_default_if_missing;
DROP PROCEDURE IF EXISTS add_col_if_missing;