// Copyright 2017 PingCAP, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// See the License for the specific language governing permissions and
// limitations under the License.

package ast_test

import (
	. "github.com/pingcap/check"
	. "github.com/pingcap/parser/ast"
)

var _ = Suite(&testDMLSuite{})

type testDMLSuite struct {
}

func (ts *testDMLSuite) TestDMLVisitorCover(c *C) {
	ce := &checkExpr{}

	tableRefsClause := &TableRefsClause{TableRefs: &Join{Left: &TableSource{Source: &TableName{}}, On: &OnCondition{Expr: ce}}}

	stmts := []struct {
		node             Node
		expectedEnterCnt int
		expectedLeaveCnt int
	}{
		{&DeleteStmt{TableRefs: tableRefsClause, Tables: &DeleteTableList{}, Where: ce,
			Order: &OrderByClause{}, Limit: &Limit{Count: ce, Offset: ce}}, 4, 4},
		{&ShowStmt{Table: &TableName{}, Column: &ColumnName{}, Pattern: &PatternLikeExpr{Expr: ce, Pattern: ce}, Where: ce}, 3, 3},
		{&LoadDataStmt{Table: &TableName{}, Columns: []*ColumnName{{}}, FieldsInfo: &FieldsClause{}, LinesInfo: &LinesClause{}}, 0, 0},
		{&Assignment{Column: &ColumnName{}, Expr: ce}, 1, 1},
		{&ByItem{Expr: ce}, 1, 1},
		{&GroupByClause{Items: []*ByItem{{Expr: ce}, {Expr: ce}}}, 2, 2},
		{&HavingClause{Expr: ce}, 1, 1},
		{&Join{Left: &TableSource{Source: &TableName{}}}, 0, 0},
		{&Limit{Count: ce, Offset: ce}, 2, 2},
		{&OnCondition{Expr: ce}, 1, 1},
		{&OrderByClause{Items: []*ByItem{{Expr: ce}, {Expr: ce}}}, 2, 2},
		{&SelectField{Expr: ce, WildCard: &WildCardField{}}, 1, 1},
		{&TableName{}, 0, 0},
		{tableRefsClause, 1, 1},
		{&TableSource{Source: &TableName{}}, 0, 0},
		{&WildCardField{}, 0, 0},

		// TODO: cover childrens
		{&InsertStmt{Table: tableRefsClause}, 1, 1},
		{&UnionStmt{}, 0, 0},
		{&UpdateStmt{TableRefs: tableRefsClause}, 1, 1},
		{&SelectStmt{}, 0, 0},
		{&FieldList{}, 0, 0},
		{&UnionSelectList{}, 0, 0},
	}

	for _, v := range stmts {
		ce.reset()
		v.node.Accept(checkVisitor{})
		c.Check(ce.enterCnt, Equals, v.expectedEnterCnt)
		c.Check(ce.leaveCnt, Equals, v.expectedLeaveCnt)
		v.node.Accept(visitor1{})
	}
}
