-- 用户角色关系增加启用状态，并按当前开启的教代会届次初始化历史数据。
-- 脚本支持重复执行：字段已存在时不再重复修改表结构。
SET @sys_user_role_enable_column_count = (
    SELECT COUNT(*)
    FROM information_schema.COLUMNS
    WHERE TABLE_SCHEMA = DATABASE()
      AND TABLE_NAME = 'sys_user_role'
      AND COLUMN_NAME = 'enable'
);

SET @sys_user_role_enable_ddl = IF(
    @sys_user_role_enable_column_count = 0,
    'ALTER TABLE sys_user_role ADD COLUMN enable TINYINT(1) NOT NULL DEFAULT 1 COMMENT ''是否启用：1启用，0禁用'' AFTER userId',
    'SELECT 1'
);

PREPARE sys_user_role_enable_stmt FROM @sys_user_role_enable_ddl;
EXECUTE sys_user_role_enable_stmt;
DEALLOCATE PREPARE sys_user_role_enable_stmt;

-- 普通角色不受教代会届次切换影响，历史数据统一保持启用。
UPDATE sys_user_role
SET enable = 1
WHERE tcSessionId IS NULL OR tcSessionId = '';

-- 历史教代会届次角色先全部禁用，再只启用当前开启的最新届次。
UPDATE sys_user_role
SET enable = 0
WHERE tcSessionId IS NOT NULL AND tcSessionId <> '';

SET @current_teacher_congress_session_id = (
    SELECT id
    FROM teacher_congress_session
    WHERE enable = 1
    ORDER BY startDate DESC, createdAt DESC, id DESC
    LIMIT 1
);

UPDATE sys_user_role
SET enable = 1
WHERE tcSessionId = @current_teacher_congress_session_id;