package f5

import (
	"fmt"
)

type LinkOp int32

const (
	LK_AND LinkOp = iota
	LK_OR
)

type QueryCond int32

const (
	QC_LIKE QueryCond = iota
	QC_EQ
	QC_LT
	QC_LE
	QC_GT
	QC_GE
	QC_CUSTOM
)

type dbFilter struct {
}

type DbQueryFilter interface {
	And() DbQueryFilter
	Or() DbQueryFilter
	Not() DbQueryFilter
	GetLinkOp() LinkOp
	GenSql() string
}

type PageQueryOne struct {
	linkOp LinkOp
	not bool
	fieldName string
	cond QueryCond
	ignoreEmpty bool
	val string
}

type PageQueryComp struct {
	linkOp LinkOp
	not bool
	subFilters []DbQueryFilter
}

func (this *dbFilter) init() {
}

func (this *dbFilter) unInit() {
}

func (this *dbFilter) Like(fieldName string, val string) DbQueryFilter {
	f := &PageQueryOne{
		cond: QC_LIKE,
		fieldName: fieldName,
		val: val}
	return f
}

func (this *dbFilter) EQ(fieldName string, val string) DbQueryFilter {
	f := &PageQueryOne{
		cond: QC_EQ,
		fieldName: fieldName,
		val: val}
	return f
}

func (this *dbFilter) LT(fieldName string, val string) DbQueryFilter {
	f := &PageQueryOne{
		cond: QC_LT,
		fieldName: fieldName,
		val: val}
	return f
}

func (this *dbFilter) LE(fieldName string, val string) DbQueryFilter {
	f := &PageQueryOne{
		cond: QC_LE,
		fieldName: fieldName,
		val: val}
	return f
}

func (this *dbFilter) GT(fieldName string, val string) DbQueryFilter {
	f := &PageQueryOne{
		cond: QC_GT,
		fieldName: fieldName,
		val: val}
	return f
}

func (this *dbFilter) GE(fieldName string, val string) DbQueryFilter {
	f := &PageQueryOne{
		cond: QC_GE,
		fieldName: fieldName,
		val: val}
	return f
}

func (this *dbFilter) Custom(val string) DbQueryFilter {
	f := &PageQueryOne{
		cond: QC_CUSTOM,
		fieldName: "",
		val: val}
	return f
}

func (this *dbFilter) Comp(subFilters ...DbQueryFilter) DbQueryFilter {
	f := &PageQueryComp{
		subFilters: subFilters}
	return f
}

func (this *PageQueryOne) IgnoreEmpy() DbQueryFilter {
	this.ignoreEmpty = true
	return this
}


func (this *PageQueryOne) And() DbQueryFilter {
	this.linkOp = LK_AND
	return this
}

func (this *PageQueryOne) Or() DbQueryFilter {
	this.linkOp = LK_OR
	return this
}

func (this *PageQueryOne) Not() DbQueryFilter {
	this.not = true
	return this
}

func (this *PageQueryOne) GetLinkOp() LinkOp {
	return this.linkOp
}

func (this *PageQueryOne) GenSql() string {
	if this.ignoreEmpty && this.val == "" {
		return " "
	}
	sql := ""
	switch this.cond {
	case QC_LIKE:
		sql = fmt.Sprintf("%s LIKE '%%%s%%'", this.fieldName, this.val)
	case QC_EQ:
		sql = fmt.Sprintf("%s = '%s'", this.fieldName, this.val)
	case QC_LT:
		sql = fmt.Sprintf("%s < '%s'", this.fieldName, this.val)
	case QC_LE:
		sql = fmt.Sprintf("%s <= '%s'", this.fieldName, this.val)
	case QC_GT:
		sql = fmt.Sprintf("%s > '%s'", this.fieldName, this.val)
	case QC_GE:
		sql = fmt.Sprintf("%s >= '%s'", this.fieldName, this.val)
	case QC_CUSTOM:
		sql = fmt.Sprintf("%s", this.val)
	default:
		panic("page query cond error")
	}
	if this.not {
		sql = fmt.Sprintf(" NOT (%s) ", sql)
	}
	switch this.linkOp {
	case LK_AND:
		sql = fmt.Sprintf(" AND (%s) ", sql)
	case LK_OR:
		sql = fmt.Sprintf(" OR (%s) ", sql)
	default:
		panic("page query linkOp error")
	}
	return sql
}

func (this *PageQueryComp) And() DbQueryFilter {
	this.linkOp = LK_AND
	return this
}

func (this *PageQueryComp) Or() DbQueryFilter {
	this.linkOp = LK_OR
	return this
}

func (this *PageQueryComp) Not() DbQueryFilter {
	this.not = true
	return this
}

func (this *PageQueryComp) GetLinkOp() LinkOp {
	return this.linkOp
}

func (this *PageQueryComp) GenSql() string {
	if len(this.subFilters) <= 0 {
		return " "
	}
	sql := " "
	for index, filter := range this.subFilters {
		if index == 0 {
			if filter.GetLinkOp() == LK_AND {
				sql = " 1=1 "
			} else {
				sql = " 1<>1 "
			}
		}
		sql += filter.GenSql()
	}
	if this.not {
		sql = fmt.Sprintf(" NOT (%s) ", sql)
	}
	switch this.linkOp {
	case LK_AND:
		sql = fmt.Sprintf(" AND (%s) ", sql)
	case LK_OR:
		sql = fmt.Sprintf(" OR (%s) ", sql)
	default:
		panic("page query linkOp error")
	}
	return sql
}