-- OnboardX 入职人员与电子签约业务数据清理脚本
-- 适用数据库：MySQL 8.0+
--
-- 会物理删除：
--   1. 正式员工档案；
--   2. 入职任务及候选人填写、材料、审核、合同快照等任务数据；
--   3. 契约锁流程、文档映射、回调及后台预览/盖章事件。
--
-- 会保留：
--   公司、部门、岗位、入职模板、合同模板及版本、模板适用范围、
--   合同变量字典、模板变量、上传资料类型及其他系统基础配置。
--
-- 特别注意：
--   1. 执行前请先备份数据库；本脚本提交后不可恢复。
--   2. 请先在契约锁作废仍在签署中的测试流程，或临时关闭回调；
--      本脚本只清理本地数据库，不能删除或作废契约锁平台上的合同。
--   3. 本脚本不删除 sys_file/dev_file 等系统文件记录，也不删除 OSS 对象，
--      避免误删合同模板源文件或其他模块共用文件。
--   4. DELETE 会同时清理正常数据和已经软删除的数据。

USE `OnboardX`;
SET NAMES utf8mb4;

DROP PROCEDURE IF EXISTS `ob_reset_onboarding_personnel_and_sign_data`;

DELIMITER $$

CREATE PROCEDURE `ob_reset_onboarding_personnel_and_sign_data`()
BEGIN
    DECLARE old_foreign_key_checks INT DEFAULT 1;
    DECLARE finished INT DEFAULT 0;
    DECLARE target_table_name VARCHAR(64);
    DECLARE before_rows BIGINT DEFAULT 0;
    DECLARE after_rows BIGINT DEFAULT 0;

    -- 只允许删除明确列出的流程数据表。新版本即使增加 ob_ 基础表，也不会被误删。
    DECLARE target_table_cursor CURSOR FOR
        SELECT `TABLE_NAME`
        FROM `information_schema`.`TABLES`
        WHERE `TABLE_SCHEMA` = DATABASE()
          AND `TABLE_TYPE` = 'BASE TABLE'
          AND `TABLE_NAME` IN (
              'ob_electronic_sign_event',
              'ob_electronic_sign_document',
              'ob_electronic_sign_process',
              'ob_task_operation_log',
              'ob_task_audit',
              'ob_task_material',
              'ob_task_form_value',
              'ob_task_employee_info',
              'ob_task_contract_variable',
              'ob_task_contract',
              'ob_task_link',
              'ob_task_material_requirement',
              'ob_task_form_requirement',
              'ob_onboarding_task',
              'ob_employee'
          )
        ORDER BY FIELD(
            `TABLE_NAME`,
            'ob_electronic_sign_event',
            'ob_electronic_sign_document',
            'ob_electronic_sign_process',
            'ob_task_operation_log',
            'ob_task_audit',
            'ob_task_material',
            'ob_task_form_value',
            'ob_task_employee_info',
            'ob_task_contract_variable',
            'ob_task_contract',
            'ob_task_link',
            'ob_task_material_requirement',
            'ob_task_form_requirement',
            'ob_onboarding_task',
            'ob_employee'
        );

    DECLARE CONTINUE HANDLER FOR NOT FOUND SET finished = 1;

    DECLARE EXIT HANDLER FOR SQLEXCEPTION
    BEGIN
        ROLLBACK;
        SET FOREIGN_KEY_CHECKS = old_foreign_key_checks;
        RESIGNAL;
    END;

    IF LOWER(DATABASE()) <> 'onboardx' THEN
        SIGNAL SQLSTATE '45000'
            SET MESSAGE_TEXT = '当前数据库不是 OnboardX，已拒绝执行人员与签约数据清理';
    END IF;

    DROP TEMPORARY TABLE IF EXISTS `tmp_ob_reset_result`;
    CREATE TEMPORARY TABLE `tmp_ob_reset_result` (
        `TableName` VARCHAR(64) NOT NULL,
        `BeforeRows` BIGINT NOT NULL,
        `DeletedRows` BIGINT NOT NULL,
        `AfterRows` BIGINT NOT NULL,
        PRIMARY KEY (`TableName`)
    );

    SET old_foreign_key_checks = @@FOREIGN_KEY_CHECKS;
    SET FOREIGN_KEY_CHECKS = 0;

    START TRANSACTION;

    OPEN target_table_cursor;

    delete_loop: LOOP
        FETCH target_table_cursor INTO target_table_name;
        IF finished = 1 THEN
            LEAVE delete_loop;
        END IF;

        SET @ob_reset_row_count = 0;
        SET @ob_reset_count_sql = CONCAT(
            'SELECT COUNT(*) INTO @ob_reset_row_count FROM `',
            REPLACE(target_table_name, '`', '``'),
            '`'
        );
        PREPARE ob_reset_count_statement FROM @ob_reset_count_sql;
        EXECUTE ob_reset_count_statement;
        DEALLOCATE PREPARE ob_reset_count_statement;
        SET before_rows = COALESCE(@ob_reset_row_count, 0);

        SET @ob_reset_delete_sql = CONCAT(
            'DELETE FROM `',
            REPLACE(target_table_name, '`', '``'),
            '`'
        );
        PREPARE ob_reset_delete_statement FROM @ob_reset_delete_sql;
        EXECUTE ob_reset_delete_statement;
        DEALLOCATE PREPARE ob_reset_delete_statement;

        SET @ob_reset_row_count = 0;
        PREPARE ob_reset_count_statement FROM @ob_reset_count_sql;
        EXECUTE ob_reset_count_statement;
        DEALLOCATE PREPARE ob_reset_count_statement;
        SET after_rows = COALESCE(@ob_reset_row_count, 0);

        INSERT INTO `tmp_ob_reset_result` (
            `TableName`,
            `BeforeRows`,
            `DeletedRows`,
            `AfterRows`
        ) VALUES (
            target_table_name,
            before_rows,
            before_rows - after_rows,
            after_rows
        );
    END LOOP;

    CLOSE target_table_cursor;

    COMMIT;
    SET FOREIGN_KEY_CHECKS = old_foreign_key_checks;

    SELECT
        `TableName` AS `已清理表`,
        `BeforeRows` AS `清理前`,
        `DeletedRows` AS `删除数量`,
        `AfterRows` AS `清理后`
    FROM `tmp_ob_reset_result`
    ORDER BY FIELD(
        `TableName`,
        'ob_electronic_sign_event',
        'ob_electronic_sign_document',
        'ob_electronic_sign_process',
        'ob_task_operation_log',
        'ob_task_audit',
        'ob_task_material',
        'ob_task_form_value',
        'ob_task_employee_info',
        'ob_task_contract_variable',
        'ob_task_contract',
        'ob_task_link',
        'ob_task_material_requirement',
        'ob_task_form_requirement',
        'ob_onboarding_task',
        'ob_employee'
    );

    DROP TEMPORARY TABLE IF EXISTS `tmp_ob_reset_result`;
END$$

DELIMITER ;

CALL `ob_reset_onboarding_personnel_and_sign_data`();
DROP PROCEDURE IF EXISTS `ob_reset_onboarding_personnel_and_sign_data`;

-- 最终校验：下面存在的流程表都应为 0 行。
SELECT
    `TABLE_NAME` AS `流程数据表`,
    `TABLE_ROWS` AS `估算剩余行数`
FROM `information_schema`.`TABLES`
WHERE `TABLE_SCHEMA` = DATABASE()
  AND `TABLE_TYPE` = 'BASE TABLE'
  AND `TABLE_NAME` IN (
      'ob_electronic_sign_event',
      'ob_electronic_sign_document',
      'ob_electronic_sign_process',
      'ob_task_operation_log',
      'ob_task_audit',
      'ob_task_material',
      'ob_task_form_value',
      'ob_task_employee_info',
      'ob_task_contract_variable',
      'ob_task_contract',
      'ob_task_link',
      'ob_task_material_requirement',
      'ob_task_form_requirement',
      'ob_onboarding_task',
      'ob_employee'
  )
ORDER BY `TABLE_NAME`;