package sharding

import (
	"context"
	sqlparserX "github.com/uole/sqlparser"
)

const (
	TypeDatetime = "datetime"
	TypeHash     = "hash"
)

const (
	DateTypeYear = iota + 5
	DateTypeMonth
	DateTypeWeek
	DateTypeDay
)

const (
	sceneCreate = "create"
	sceneUpdate = "update"
	sceneDelete = "delete"
)

const (
	stmtCountKeyword = "count"
)

type (
	Rule struct {
		Type string `json:"type"`
		Args int    `json:"args"`
	}

	Model interface {
		ShardingRule() Rule
		ShardingTable(scene string) string
		ShardingTables(scope *Scope) []string
	}

	SelectBuilder interface {
		BuildSelect(ctx context.Context, expr sqlparserX.SelectExprs) []string
	}
)