package product

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 _ SysProductModel = (*customSysProductModel)(nil)

type (
	SysProductModel interface {
		sysProductModel
		FindList(ctx context.Context, page, pageSize int64) ([]*SysProduct, int64, error)
		UpdateWithOptLock(ctx context.Context, data *SysProduct, expectedUpdateTime int64) error
		// LockByCodeTx 在当前事务里锁定 product 行（SELECT ... FOR UPDATE），用于把跨表写入（如权限同步）
		// 按 product 串行化，避免两次并发 SyncPermissions 在 sys_perm UNIQUE(productCode, code) 上撞 1062。
		LockByCodeTx(ctx context.Context, session sqlx.Session, code string) (*SysProduct, error)
	}

	customSysProductModel struct {
		*defaultSysProductModel
	}
)

func NewSysProductModel(conn sqlx.SqlConn, c cache.CacheConf, cachePrefix string, opts ...cache.Option) SysProductModel {
	return &customSysProductModel{
		defaultSysProductModel: newSysProductModel(conn, c, cachePrefix, opts...),
	}
}

func (m *customSysProductModel) UpdateWithOptLock(ctx context.Context, data *SysProduct, expectedUpdateTime int64) error {
	sysProductIdKey := fmt.Sprintf("%s%v", cacheSysProductIdPrefix, data.Id)
	sysProductAppKeyKey := fmt.Sprintf("%s%v", cacheSysProductAppKeyPrefix, data.AppKey)
	sysProductCodeKey := fmt.Sprintf("%s%v", cacheSysProductCodePrefix, data.Code)
	res, err := m.ExecCtx(ctx, func(ctx context.Context, conn sqlx.SqlConn) (sql.Result, error) {
		query := fmt.Sprintf("UPDATE %s SET `name`=?, `remark`=?, `status`=?, `updateTime`=? WHERE `id`=? AND `updateTime`=?", m.table)
		return conn.ExecCtx(ctx, query, data.Name, data.Remark, data.Status, data.UpdateTime, data.Id, expectedUpdateTime)
	}, sysProductIdKey, sysProductAppKeyKey, sysProductCodeKey)
	if err != nil {
		return err
	}
	affected, _ := res.RowsAffected()
	if affected == 0 {
		return ErrUpdateConflict
	}
	return nil
}

func (m *customSysProductModel) LockByCodeTx(ctx context.Context, session sqlx.Session, code string) (*SysProduct, error) {
	var resp SysProduct
	query := fmt.Sprintf("SELECT %s FROM %s WHERE `code` = ? LIMIT 1 FOR UPDATE", sysProductRows, m.table)
	if err := session.QueryRowCtx(ctx, &resp, query, code); err != nil {
		return nil, err
	}
	return &resp, nil
}

func (m *customSysProductModel) FindList(ctx context.Context, page, pageSize int64) ([]*SysProduct, int64, error) {
	var total int64
	countQuery := fmt.Sprintf("SELECT COUNT(*) FROM %s", m.table)
	if err := m.QueryRowNoCacheCtx(ctx, &total, countQuery); err != nil {
		return nil, 0, err
	}

	var list []*SysProduct
	query := fmt.Sprintf("SELECT %s FROM %s ORDER BY id DESC LIMIT ?,?", sysProductRows, m.table)
	if err := m.QueryRowsNoCacheCtx(ctx, &list, query, (page-1)*pageSize, pageSize); err != nil {
		return nil, 0, err
	}

	return list, total, nil
}