/*
 * Copyright 1999-2017 Alibaba Group Holding Ltd.
 *
 * 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,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.druid.sql.ast.expr;

import com.alibaba.druid.sql.ast.SQLExpr;
import com.alibaba.druid.sql.ast.SQLExprImpl;
import com.alibaba.druid.sql.ast.SQLObject;
import com.alibaba.druid.sql.ast.SQLReplaceable;
import com.alibaba.druid.sql.visitor.SQLASTVisitor;

import java.util.ArrayList;
import java.util.List;

public class SQLMatchAgainstExpr extends SQLExprImpl implements SQLReplaceable {
    private List<SQLExpr> columns = new ArrayList<SQLExpr>();
    private SQLExpr against;
    private SearchModifier searchModifier;

    public SQLMatchAgainstExpr() {
    }

    public SQLMatchAgainstExpr clone() {
        SQLMatchAgainstExpr x = new SQLMatchAgainstExpr();
        for (SQLExpr column : columns) {
            SQLExpr column2 = column.clone();
            column2.setParent(x);
            x.columns.add(column2);
        }
        if (against != null) {
            x.setAgainst(against.clone());
        }
        x.searchModifier = searchModifier;
        return x;
    }

    @Override
    public boolean replace(SQLExpr expr, SQLExpr target) {
        if (this.against == expr) {
            setAgainst(target);
            return true;
        }

        for (int i = 0; i < columns.size(); i++) {
            if (columns.get(i) == expr) {
                target.setParent(this);
                columns.set(i, target);
                return true;
            }
        }

        return false;
    }

    public List<SQLExpr> getColumns() {
        return columns;
    }

    public void setColumns(List<SQLExpr> columns) {
        this.columns = columns;
    }

    public SQLExpr getAgainst() {
        return against;
    }

    public void setAgainst(SQLExpr against) {
        if (against != null) {
            against.setParent(this);
        }
        this.against = against;
    }

    public SearchModifier getSearchModifier() {
        return searchModifier;
    }

    public void setSearchModifier(SearchModifier searchModifier) {
        this.searchModifier = searchModifier;
    }

    public static enum SearchModifier {
        IN_BOOLEAN_MODE("IN BOOLEAN MODE"),
        IN_NATURAL_LANGUAGE_MODE("IN NATURAL LANGUAGE MODE"),
        IN_NATURAL_LANGUAGE_MODE_WITH_QUERY_EXPANSION("IN NATURAL LANGUAGE MODE WITH QUERY EXPANSION"),
        WITH_QUERY_EXPANSION("WITH QUERY EXPANSION");

        public final String name;
        public final String nameLCase;

        SearchModifier() {
            this(null);
        }

        SearchModifier(String name) {
            this.name = name;
            this.nameLCase = name == null ? null : name.toLowerCase();
        }
    }

    @Override
    protected void accept0(SQLASTVisitor v) {
        if (v.visit(this)) {
            if (columns != null) {
                for (SQLExpr column : this.columns) {
                    if (column != null) {
                        column.accept(v);
                    }
                }
            }

            if (this.against != null) {
                against.accept(v);
            }
        }
        v.endVisit(this);
    }

    @Override
    public List getChildren() {
        List<SQLObject> children = new ArrayList<SQLObject>();
        children.addAll(this.columns);
        children.add(this.against);
        return children;
    }

    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((against == null) ? 0 : against.hashCode());
        result = prime * result + ((columns == null) ? 0 : columns.hashCode());
        result = prime * result + ((searchModifier == null) ? 0 : searchModifier.hashCode());
        return result;
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj == null) {
            return false;
        }
        if (getClass() != obj.getClass()) {
            return false;
        }
        SQLMatchAgainstExpr other = (SQLMatchAgainstExpr) obj;
        if (against == null) {
            if (other.against != null) {
                return false;
            }
        } else if (!against.equals(other.against)) {
            return false;
        }
        if (columns == null) {
            if (other.columns != null) {
                return false;
            }
        } else if (!columns.equals(other.columns)) {
            return false;
        }
        if (searchModifier != other.searchModifier) {
            return false;
        }
        return true;
    }

}
