package dept

import (
	"context"
	"database/sql"
	"errors"
	"fmt"

	"github.com/zeromicro/go-zero/core/stores/cache"
	"github.com/zeromicro/go-zero/core/stores/sqlx"
)

var ErrUpdateConflict = errors.New("update conflict: data has been modified by another operation")

var _ SysDeptModel = (*customSysDeptModel)(nil)

type (
	SysDeptModel interface {
		sysDeptModel
		FindAll(ctx context.Context) ([]*SysDept, error)
		UpdateWithOptLock(ctx context.Context, data *SysDept, expectedUpdateTime int64) error
		// FindOneForShareTx 在当前事务里对 sys_dept 目标行加 S 锁（SELECT ... LOCK IN SHARE MODE），
		// 用于"UpdateUser 改 deptId 到 X"与"DeleteDept 删除 X"之间的 write skew 闭环（审计 M-R11-3）。
		// DeleteDept 会先对 sys_dept[X] 取 X 锁——被本 S 锁阻塞；等 UpdateUser 提交后 DeleteDept 再
		// 去 FOR SHARE sys_user WHERE deptId=X 时能看到新行，改删除为 400，整链路不产生 orphan deptId。
		// 本方法不走缓存，必须在 TransactCtx / Session 下调用。
		FindOneForShareTx(ctx context.Context, session sqlx.Session, id int64) (*SysDept, error)
	}

	customSysDeptModel struct {
		*defaultSysDeptModel
	}
)

func NewSysDeptModel(conn sqlx.SqlConn, c cache.CacheConf, cachePrefix string, opts ...cache.Option) SysDeptModel {
	return &customSysDeptModel{
		defaultSysDeptModel: newSysDeptModel(conn, c, cachePrefix, opts...),
	}
}

func (m *customSysDeptModel) FindAll(ctx context.Context) ([]*SysDept, error) {
	var list []*SysDept
	query := fmt.Sprintf("SELECT %s FROM %s ORDER BY `sort` ASC, `id` ASC", sysDeptRows, m.table)
	if err := m.QueryRowsNoCacheCtx(ctx, &list, query); err != nil {
		return nil, err
	}
	return list, nil
}

func (m *customSysDeptModel) FindOneForShareTx(ctx context.Context, session sqlx.Session, id int64) (*SysDept, error) {
	var data SysDept
	query := fmt.Sprintf("SELECT %s FROM %s WHERE `id` = ? LIMIT 1 LOCK IN SHARE MODE", sysDeptRows, m.table)
	if err := session.QueryRowCtx(ctx, &data, query, id); err != nil {
		return nil, err
	}
	return &data, nil
}

func (m *customSysDeptModel) UpdateWithOptLock(ctx context.Context, data *SysDept, expectedUpdateTime int64) error {
	sysDeptIdKey := fmt.Sprintf("%s%v", cacheSysDeptIdPrefix, data.Id)
	res, err := m.ExecCtx(ctx, func(ctx context.Context, conn sqlx.SqlConn) (sql.Result, error) {
		query := fmt.Sprintf("UPDATE %s SET `name`=?, `sort`=?, `deptType`=?, `remark`=?, `status`=?, `updateTime`=? WHERE `id`=? AND `updateTime`=?", m.table)
		return conn.ExecCtx(ctx, query, data.Name, data.Sort, data.DeptType, data.Remark, data.Status, data.UpdateTime, data.Id, expectedUpdateTime)
	}, sysDeptIdKey)
	if err != nil {
		return err
	}
	affected, _ := res.RowsAffected()
	if affected == 0 {
		return ErrUpdateConflict
	}
	return nil
}