-- =============================================
-- 清理孤立数据（在添加外键前必须执行）
-- 版本: cleanup-script
-- 日期: 2026-04-07
-- 说明: 删除所有违反引用完整性的孤立数据
-- =============================================

BEGIN;

-- ============================================================
-- 第一部分：清理项目员工表的孤立数据
-- ============================================================

-- 1.1 删除引用不存在项目的员工记录
DELETE FROM project_staff
WHERE project_id IS NOT NULL
AND project_id NOT IN (SELECT id FROM mdm_project);

-- 1.2 删除引用不存在用户的员工记录（理论上不应该存在，因为已有外键）
DELETE FROM project_staff
WHERE user_id NOT IN (SELECT id FROM auth_user);

-- 1.3 删除引用不存在班组长ID的记录（leader_id允许为NULL）
UPDATE project_staff
SET leader_id = NULL
WHERE leader_id IS NOT NULL
AND leader_id NOT IN (SELECT id FROM auth_user);

-- ============================================================
-- 第二部分：清理房屋表的孤立数据
-- ============================================================

-- 2.1 删除引用不存在项目的房屋记录
DELETE FROM space
WHERE project_id NOT IN (SELECT id FROM mdm_project);

-- ============================================================
-- 第三部分：清理用户表的可能孤立数据
-- ============================================================

-- 3.1 清理用户表中引用不存在部门的记录（dept_id允许为NULL）
DO $$
BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'auth_user'
        AND column_name = 'dept_id'
    ) THEN
        UPDATE auth_user
        SET dept_id = NULL
        WHERE dept_id IS NOT NULL
        AND dept_id NOT IN (SELECT id FROM dept);
    END IF;
END $$;

-- ============================================================
-- 第四部分：清理角色表的可能孤立数据
-- ============================================================

-- 4.1 清理角色表中引用不存在项目的记录（project_id允许为NULL）
DO $$
BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'auth_role'
        AND column_name = 'project_id'
    ) THEN
        UPDATE auth_role
        SET project_id = NULL
        WHERE project_id IS NOT NULL
        AND project_id NOT IN (SELECT id FROM mdm_project);
    END IF;
END $$;

-- ============================================================
-- 第五部分：清理用户角色关联表的可能孤立数据
-- ============================================================

-- 5.1 清理用户角色表中引用不存在项目的记录（project_id允许为NULL）
DO $$
BEGIN
    IF EXISTS (
        SELECT 1 FROM information_schema.columns
        WHERE table_name = 'auth_user_role'
        AND column_name = 'project_id'
    ) THEN
        UPDATE auth_user_role
        SET project_id = NULL
        WHERE project_id IS NOT NULL
        AND project_id NOT IN (SELECT id FROM mdm_project);
    END IF;
END $$;

-- ============================================================
-- 第六部分：统计清理结果（用于验证）
-- ============================================================

-- 创建临时表记录清理结果（可选）
DROP TABLE IF EXISTS cleanup_statistics;

CREATE TEMPORARY TABLE cleanup_statistics (
    table_name VARCHAR(50),
    check_type VARCHAR(100),
    orphan_count INT,
    cleaned_at TIMESTAMP DEFAULT CURRENT_TIMESTAMP
);

-- 插入统计信息
INSERT INTO cleanup_statistics (table_name, check_type, orphan_count)
SELECT 'project_staff', 'invalid_project_id', COUNT(*)
FROM project_staff
WHERE project_id IS NOT NULL
AND project_id NOT IN (SELECT id FROM mdm_project);

INSERT INTO cleanup_statistics (table_name, check_type, orphan_count)
SELECT 'space', 'invalid_project_id', COUNT(*)
FROM space
WHERE project_id NOT IN (SELECT id FROM mdm_project);

-- 输出清理结果
SELECT * FROM cleanup_statistics ORDER BY table_name, check_type;

COMMIT;

-- =============================================
-- 使用说明：
--
-- 1. 在生产环境执行前，请先备份数据库
-- 2. 建议在维护窗口期执行
-- 3. 执行完成后，检查cleanup_statistics确认无孤立数据
-- 4. 确认无误后，再执行 V999__add_foreign_keys.sql
--
-- 回滚方案：如果有误删，从备份恢复
-- =============================================