/*

Copyright 2010, Google Inc.
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    * Redistributions of source code must retain the above copyright
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    * Redistributions in binary form must reproduce the above
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contributors may be used to endorse or promote products derived from
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"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,           
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*/

package com.google.refine.operations.row;

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

import com.fasterxml.jackson.annotation.JsonCreator;
import com.fasterxml.jackson.annotation.JsonProperty;
import com.google.refine.browsing.Engine;
import com.google.refine.browsing.EngineConfig;
import com.google.refine.browsing.FilteredRows;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.history.HistoryEntry;
import com.google.refine.model.Project;
import com.google.refine.model.Row;
import com.google.refine.model.changes.RowRemovalChange;
import com.google.refine.operations.EngineDependentOperation;

public class RowRemovalOperation extends EngineDependentOperation {
    @JsonCreator
    public RowRemovalOperation(
            @JsonProperty("engineConfig")
            EngineConfig engineConfig) {
        super(engineConfig);
    }

    @Override
    protected String getBriefDescription(Project project) {
        return "Remove rows";
    }

   @Override
protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
        Engine engine = createEngine(project);
        
        List<Integer> rowIndices = new ArrayList<Integer>();
        
        FilteredRows filteredRows = engine.getAllFilteredRows();
        filteredRows.accept(project, createRowVisitor(project, rowIndices));
        
        return new HistoryEntry(
            historyEntryID,
            project, 
            "Remove " + rowIndices.size() + " rows", 
            this, 
            new RowRemovalChange(rowIndices)
        );
    }

    protected RowVisitor createRowVisitor(Project project, List<Integer> rowIndices) throws Exception {
        return new RowVisitor() {
            List<Integer> rowIndices;
            
            public RowVisitor init(List<Integer> rowIndices) {
                this.rowIndices = rowIndices;
                return this;
            }

            @Override
            public void start(Project project) {
                // nothing to do
            }

            @Override
            public void end(Project project) {
                // nothing to do
            }

            @Override
            public boolean visit(Project project, int rowIndex, Row row) {
                rowIndices.add(rowIndex);
                
                return false;
            }
        }.init(rowIndices);
    }
}
