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/*
    This file is part of the iText (R) project.
    Copyright (c) 1998-2023 Apryse Group NV
    Authors: Apryse Software.

    This program is offered under a commercial and under the AGPL license.
    For commercial licensing, contact us at https://itextpdf.com/sales.  For AGPL licensing, see below.

    AGPL licensing:
    This program 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.

    This program 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 this program.  If not, see .
 */
package com.itextpdf.kernel.pdf.canvas.wmf;

import com.itextpdf.io.font.FontEncoding;
import com.itextpdf.io.font.FontProgram;
import com.itextpdf.io.font.FontProgramFactory;
import com.itextpdf.io.font.PdfEncodings;
import com.itextpdf.io.font.constants.FontStyles;

import java.io.IOException;
import java.io.UnsupportedEncodingException;

/**
 * A Meta Font.
 */
public class MetaFont extends MetaObject {
    static final String[] fontNames = {
        "Courier", "Courier-Bold", "Courier-Oblique", "Courier-BoldOblique",
        "Helvetica", "Helvetica-Bold", "Helvetica-Oblique", "Helvetica-BoldOblique",
        "Times-Roman", "Times-Bold", "Times-Italic", "Times-BoldItalic",
        "Symbol", "ZapfDingbats"};

    static final int MARKER_BOLD = 1;
    static final int MARKER_ITALIC = 2;
    static final int MARKER_COURIER = 0;
    static final int MARKER_HELVETICA = 4;
    static final int MARKER_TIMES = 8;
    static final int MARKER_SYMBOL = 12;

    static final int DEFAULT_PITCH = 0;
    static final int FIXED_PITCH = 1;
    static final int VARIABLE_PITCH = 2;
    static final int FF_DONTCARE = 0;
    static final int FF_ROMAN = 1;
    static final int FF_SWISS = 2;
    static final int FF_MODERN = 3;
    static final int FF_SCRIPT = 4;
    static final int FF_DECORATIVE = 5;
    static final int BOLDTHRESHOLD = 600;    
    static final int NAME_SIZE = 32;
    static final int ETO_OPAQUE = 2;
    static final int ETO_CLIPPED = 4;

    int height;
    float angle;
    int bold;
    int italic;
    boolean underline;
    boolean strikeout;
    int charset;
    int pitchAndFamily;
    String faceName = "arial";
    FontProgram font = null;
    FontEncoding encoding = null;

    /**
     * Creates a MetaFont instance.
     */
    public MetaFont() {
        super(META_FONT);
    }

    /**
     * Initializes the MetaFont instance.
     *
     * @param in InputMeta containing the WMF data
     * @throws IOException an {@link IOException}
     */
    public void init(InputMeta in) throws IOException {
        height = Math.abs(in.readShort());
        in.skip(2);
        angle = (float)(in.readShort() / 1800.0 * Math.PI);
        in.skip(2);
        bold = (in.readShort() >= BOLDTHRESHOLD ? MARKER_BOLD : 0);
        italic = (in.readByte() != 0 ? MARKER_ITALIC : 0);
        underline = (in.readByte() != 0);
        strikeout = (in.readByte() != 0);
        charset = in.readByte();
        in.skip(3);
        pitchAndFamily = in.readByte();
        byte[] name = new byte[NAME_SIZE];
        int k;
        for (k = 0; k < NAME_SIZE; ++k) {
            int c = in.readByte();
            if (c == 0) {
                break;
            }
            name[k] = (byte)c;
        }
        try {
            faceName = new String(name, 0, k, "Cp1252");
        } catch (UnsupportedEncodingException e) {
            faceName = new String(name, 0, k);
        }
        faceName = faceName.toLowerCase();
    }

    /**
     * Returns the Font.
     *
     * @return the font
     * @throws IOException an {@link IOException}
     */
    public FontProgram getFont() throws IOException {
        if (font != null)
            return font;
        FontProgram ff2 = FontProgramFactory.createRegisteredFont(faceName, ((italic != 0) ? FontStyles.ITALIC : 0) | ((bold != 0) ? FontStyles.BOLD : 0));
        encoding = FontEncoding.createFontEncoding(PdfEncodings.WINANSI);
        font = ff2;
        if (font != null)
            return font;
        String fontName;
        if (faceName.contains("courier") || faceName.contains("terminal")
            || faceName.contains("fixedsys")) {
            fontName = fontNames[MARKER_COURIER + italic + bold];
        }
        else if (faceName.contains("ms sans serif") || faceName.contains("arial")
            || faceName.contains("system")) {
            fontName = fontNames[MARKER_HELVETICA + italic + bold];
        }
        else if (faceName.contains("arial black")) {
            fontName = fontNames[MARKER_HELVETICA + italic + MARKER_BOLD];
        }
        else if (faceName.contains("times") || faceName.contains("ms serif")
            || faceName.contains("roman")) {
            fontName = fontNames[MARKER_TIMES + italic + bold];
        }
        else if (faceName.contains("symbol")) {
            fontName = fontNames[MARKER_SYMBOL];
        }
        else {
            int pitch = pitchAndFamily & 3;
            int family = (pitchAndFamily >> 4) & 7;
            switch (family) {
                case FF_MODERN:
                    fontName = fontNames[MARKER_COURIER + italic + bold];
                    break;
                case FF_ROMAN:
                    fontName = fontNames[MARKER_TIMES + italic + bold];
                    break;
                case FF_SWISS:
                case FF_SCRIPT:
                case FF_DECORATIVE:
                    fontName = fontNames[MARKER_HELVETICA + italic + bold];
                    break;
                default:
                {
                    switch (pitch) {
                        case FIXED_PITCH:
                            fontName = fontNames[MARKER_COURIER + italic + bold];
                            break;
                        default:
                            fontName = fontNames[MARKER_HELVETICA + italic + bold];
                            break;
                    }
                }
            }
        }
        try {
            font = FontProgramFactory.createFont(fontName);
            encoding = FontEncoding.createFontEncoding(PdfEncodings.WINANSI);
        }
        catch (IOException e) {
            throw new RuntimeException(e.getMessage(), e);
        }

        return font;
    }

    /**
     * Returns the encoding used in the MetaFont.
     *
     * @return the font encoding
     */
    public FontEncoding getEncoding() {
        return encoding;
    }

    /**
     * Returns the angle of the MetaFont.
     *
     * @return the angle
     */
    public float getAngle() {
        return angle;
    }

    /**
     * Returns a boolean value indicating if the font is underlined or not.
     *
     * @return true if the font is underlined
     */
    public boolean isUnderline() {
        return underline;
    }

    /**
     * Returns a boolean value indicating if a font has a strikeout.
     *
     * @return true if the font set strikeout
     */
    public boolean isStrikeout() {
        return strikeout;
    }

    /**
     * Returns the font size.
     *
     * @param state the MetaState
     * @return font size
     */
    public float getFontSize(MetaState state) {
        return Math.abs(state.transformY(height) - state.transformY(0)) * WmfImageHelper.wmfFontCorrection;
    }
}