package com.onaro.sanscreen.client.view.changes.export;

import java.io.PrintWriter;

import com.onaro.sanscreen.client.view.changes.ChangeTime;
import com.onaro.sanscreen.client.view.changes.ChangesTableModel;
import com.onaro.util.jfc.tables.FilterTable;

public class Exporter {
    private FilterTable filterTable;
    private ChangesTableModel changesModel;
    private ExportFormatting formatting;
    private String title;
    private String subTitle;
    private String timeFilter;
    private String typeFilter;

    public Exporter(FilterTable filterTable, ChangesTableModel changesModel, String title, String subtitle, String timeFilter, String typeFilter, ExportFormatting formatting) {
        this.filterTable = filterTable;
        this.changesModel = changesModel;
        this.title = title;
        this.subTitle = subtitle;
        this.formatting = formatting;
        this.timeFilter = timeFilter;
        this.typeFilter = typeFilter;
    }

    /**
     * Exports the changes to an output writer using hte specified formatting. The expande/collapse of the
     * exported changes is the same as in the table.
     * @param out the writer to which the changes will be exported
     */
    public void export(PrintWriter out) {
        out.print(formatting.getBodyHead());

        out.print(formatting.getHeading(title, subTitle, timeFilter, typeFilter));

        out.print(formatting.getTableHead());

        long prevRowTime = 0;
        int filteredRowCount = filterTable.getFilteredRowCount();
        for (int filterRowIndex = 0; filterRowIndex < filteredRowCount; filterRowIndex++) {
            int row = filterTable.getRowInEncapsulatedModel(filterRowIndex);
            ChangesTableModel.Row changeRow = changesModel.getChangeRow(row);

            out.print(formatting.getRowHead());

            /**
             * If the time is not-empty, count the empty rows that follows so we could
             * use a single table cell that spans on multiple rows.
             */
            ChangeTime changeTime = changeRow.getChangeTime();
            long time = changeTime.getTime();
            if (time != prevRowTime) {
                int span = 1;
                for (int emptyFilteredTimeRow = filterRowIndex + 1; emptyFilteredTimeRow < filteredRowCount; ++emptyFilteredTimeRow)
                {
                    int emptyTimeRow = filterTable.getRowInEncapsulatedModel(emptyFilteredTimeRow);
                    ChangesTableModel.Row emptyTimeChangeRow = changesModel.getChangeRow(emptyTimeRow);
                    if (emptyTimeChangeRow.getTime() != time) {
                        break;
                    }
                    ++span;
                }
                out.print(formatting.getTimeCell(changeTime.toString(), span));
            }

            /**
             * export the description
             */
            String html = changeRow.getDescriptionHtml();
            out.print(formatting.getDescriptionCell(html));

            out.print(formatting.getRowTail());
            prevRowTime = time;
        }

        out.print(formatting.getTableTail());
        out.print(formatting.getBodyTail());
    }
}