/*
 * Copyright (C) 2022  Alessandro Iezzi <aiezzi AT alessandroiezzi PERIOD it>
 *
 * This file is part of Simply Reports.
 *
 * Simply Reports is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Simply Reports is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with Simply Reports.  If not, see <https://www.gnu.org/licenses/>.
 */

package it.alessandroiezzi.simplyreports.pdf;

import com.lowagie.text.*;
import com.lowagie.text.Font;
import com.lowagie.text.pdf.*;

import java.awt.*;
import java.text.SimpleDateFormat;
import java.util.ArrayList;
import java.util.Date;
import java.util.List;
import java.util.function.Supplier;

public abstract class PDFTable<E> extends PDFEntity<PdfPTable> {
    private final List<E> entities;
    private final List<PdfTableCell> cells = new ArrayList<>();
    private final int[] widths;
    private PDFTableHeader header;
    private PDFTableFooter footer;
    private final String[] columnTitles;

    public PDFTable(List<E> entities, String[] columnTitles, int...widths) {
        this.entities = entities;
        this.widths = widths;
        this.columnTitles = columnTitles;
        generateSignature();
    }

    private void generateSignature() {
        SimpleDateFormat sdfDate = new SimpleDateFormat("dd/MM/yyyy");
        SimpleDateFormat sdfTime = new SimpleDateFormat("HH:mm");

        Date now = new Date();
        addFooter(new PDFTableFooter(null,
                                     "Generato con Simply Reports il " + sdfDate.format(now) + " alle " + sdfTime.format(now),
                                     null,
                                     null,
                                     0));
    }

    protected abstract int getNumberOfColumns();
    protected abstract void mapRow(E entity);

    public void addCell(PdfTableCell cell) {
        cells.add(cell);
    }

    public void addCell(Supplier<String> value) {
        addCell(new PdfTableCell(value));
    }

    public void addHeader(PDFTableHeader header) {
        this.header = header;
    }

    public void addFooter(PDFTableFooter footer) {
        this.footer = footer;
    }

    @Override
    protected PdfPTable generate(PdfWriter writer) {
        try {
            PdfPTable table = new PdfPTable(getNumberOfColumns());
            table.setWidthPercentage(100);

            if (widths != null && widths.length > 0)
                table.setWidths(widths);
            else
                throw new IllegalArgumentException("widths is mandatory!");

            for (E entity : this.entities) {
                mapRow(entity);
            }

            if (header != null && writer != null) {
                if (header.getColspan() == null) {
                    header.setColspan(widths.length);
                }
                table.addCell(header.generate(writer));
            }

            if (columnTitles != null && columnTitles.length > 0) {
                for (String columnTitle : columnTitles) {
                    Font f = new Font(Font.HELVETICA, 8.0f, Font.BOLD, Color.BLACK);
                    Chunk c = new Chunk(columnTitle, f);
                    Paragraph p = new Paragraph(c);
                    p.setAlignment(Element.ALIGN_CENTER);
                    PdfPCell cell = new PdfPCell();
                    cell.setUseAscender(true);
                    cell.setPadding(5);
                    cell.setVerticalAlignment(Element.ALIGN_MIDDLE);
                    cell.addElement(p);
                    table.addCell(cell);
                }
            }

            for (PdfTableCell cell : cells) {
                table.addCell(cell.getValue());
            }

            if (footer != null && writer != null) {
                if (footer.getColspan() == null) {
                    footer.setColspan(widths.length);
                }
                table.addCell(footer.generate(writer));
            }

            return table;
        } catch (DocumentException ex) {
            throw new RuntimeException(ex);
        }
    }
}