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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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*/

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.Engine.Mode;
import com.google.refine.browsing.RecordVisitor;
import com.google.refine.browsing.RowVisitor;
import com.google.refine.history.HistoryEntry;
import com.google.refine.model.AbstractOperation;
import com.google.refine.model.Project;
import com.google.refine.model.Record;
import com.google.refine.model.Row;
import com.google.refine.model.changes.RowReorderChange;
import com.google.refine.sorting.SortingConfig;
import com.google.refine.sorting.SortingRecordVisitor;
import com.google.refine.sorting.SortingRowVisitor;

public class RowReorderOperation extends AbstractOperation {
    final protected Mode _mode;
    final protected SortingConfig _sorting;

    @JsonCreator
    public RowReorderOperation(
            @JsonProperty("mode")
            Mode mode,
            @JsonProperty("sorting")
            SortingConfig sorting) {
        _mode = mode;
        _sorting = sorting;
    }
    
    @JsonProperty("mode")
    public Mode getMode() {
        return _mode;
    }
    
    @JsonProperty("sorting")
    public SortingConfig getSortingConfig() {
        return _sorting;
    }

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

    @Override
    protected HistoryEntry createHistoryEntry(Project project, long historyEntryID) throws Exception {
        Engine engine = new Engine(project);
        engine.setMode(_mode);

        List<Integer> rowIndices = new ArrayList<Integer>();
        if (_mode == Mode.RowBased) {
            RowVisitor visitor = new IndexingVisitor(rowIndices);
            if (_sorting != null) {
                SortingRowVisitor srv = new SortingRowVisitor(visitor);

                srv.initializeFromConfig(project, _sorting);
                if (srv.hasCriteria()) {
                    visitor = srv;
                }
            }

            engine.getAllRows().accept(project, visitor);
        } else {
            RecordVisitor visitor = new IndexingVisitor(rowIndices);
            if (_sorting != null) {
                SortingRecordVisitor srv = new SortingRecordVisitor(visitor);

                srv.initializeFromConfig(project, _sorting);
                if (srv.hasCriteria()) {
                    visitor = srv;
                }
            }

            engine.getAllRecords().accept(project, visitor);
        }

        return new HistoryEntry(
                historyEntryID,
                project, 
                "Reorder rows", 
                this, 
                new RowReorderChange(rowIndices)
        );
    }

    static protected class IndexingVisitor implements RowVisitor, RecordVisitor {
        List<Integer> _indices;

        IndexingVisitor(List<Integer> indices) {
            _indices = indices;
        }

        @Override
        public void start(Project project) {
        }

        @Override
        public void end(Project project) {
        }

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

        @Override
        public boolean visit(Project project, Record record) {
            for (int r = record.fromRowIndex; r < record.toRowIndex; r++) {
                _indices.add(r);
            }
            return false;
        }
    }
}
