package clause

import (
	"git.sxidc.com/go-tools/utils/strutils"
	"strings"
)

type Join struct {
	joinType  string
	tableName string
	on        string
}

func NewJoin(tableName string, on string) *Join {
	return &Join{
		joinType:  "JOIN",
		tableName: tableName,
		on:        on,
	}
}

func (clause *Join) Left() *Join {
	clause.joinType = "LEFT JOIN"
	return clause
}

func (clause *Join) Right() *Join {
	clause.joinType = "RIGHT JOIN"
	return clause
}

func (clause *Join) Inner() *Join {
	clause.joinType = "INNER JOIN"
	return clause
}

func (clause *Join) Clause() (string, error) {
	if strutils.IsStringEmpty(clause.joinType) || strutils.IsStringEmpty(clause.tableName) || strutils.IsStringEmpty(clause.on) {
		return "", nil
	}

	clauseBuilder := strings.Builder{}
	clauseBuilder.WriteString(clause.joinType)
	clauseBuilder.WriteString(" " + clause.tableName)
	clauseBuilder.WriteString(" ON ")
	clauseBuilder.WriteString(clause.on + "\n")
	return clauseBuilder.String(), nil
}

func (clause *Join) Args() []any {
	return make([]any, 0)
}