/* Copyright (C) 2023 ebandal
 * 
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU 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 General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>
 */
/* 본 제품은 한글과컴퓨터의 ᄒᆞᆫ글 문서 파일(.hwp) 공개 문서를 참고하여 개발하였습니다.
 * 개방형 워드프로세서 마크업 언어(OWPML) 문서 구조 KS X 6101:2018 문서를 참고하였습니다.
 * 작성자 : 반희수 ebandal@gmail.com  
 * 작성일 : 2022.10
 */
package HwpDoc.HwpElement;

import java.nio.charset.StandardCharsets;
import java.util.logging.Logger;

import org.w3c.dom.NamedNodeMap;
import org.w3c.dom.Node;

import HwpDoc.HanType;
import HwpDoc.HwpDocInfo;
import HwpDoc.Exception.HwpParseException;

public class HwpRecord_BinData extends HwpRecord {
    private static final Logger log = Logger.getLogger(HwpRecord_BinData.class.getName());

    public Type type;
    public Compressed compressed;
    public State state;

    public String aPath;        // Type이 "LINK"일때, 연결 파일의 절대 경로
    // public String rPath;     // Type이 "LINK"일때, 연결 파일의 상대 경로
    public short binDataID;     // Type이 "EMBEDDING"이거나 "STORAGE"일때, BINDATASTORAGE에 저장된 바이너리 데이터의 아이디
    public String format;       // Type이 "EMBEDDING"일때, extension("."제외)

    public String itemId;       // hwpx에서는 itemId가 String

    HwpRecord_BinData(int tagNum, int level, int size) {
        super(tagNum, level, size);
    }

    public HwpRecord_BinData(HwpDocInfo docInfo, int tagNum, int level, int size, byte[] buf, int off, int version)
            throws HwpParseException {
        this(tagNum, level, size);

        if (docInfo.hanType == HanType.HWP) {
            if (docInfo.getParentHwp().getBinData() == null) {
                docInfo.getParentHwp().setBinData(docInfo.getParentHwp().getOleFile().getChildEntries("BinData"));
            }
        }

        int offset = off;
        short typeBits = (short) (buf[offset + 1] << 8 & 0xFF00 | buf[offset] & 0x00FF);
        offset += 2;
        type = Type.from(typeBits & 0x0F);
        compressed = Compressed.from(typeBits & 0x30);
        state = State.from(typeBits & 0x300);

        int pathLen1 = 0, pathLen2 = 0;
        if (type == Type.LINK) {
            pathLen1 = (buf[offset + 1] << 8 & 0xFF00 | buf[offset] & 0x00FF) * 2;
            offset += 2;
            if (pathLen1 > 0) {
                aPath = new String(buf, offset, pathLen1, StandardCharsets.UTF_16LE);
                offset += pathLen1;
                log.finest("                                                  " + aPath + "(AbsoluteLink)");
            }
            pathLen2 = (buf[offset + 1] << 8 & 0xFF00 | buf[offset] & 0x00FF) * 2;
            offset += 2;
            if (pathLen2 > 0) {
                // rPath = new String(buf, offset, pathLen2, StandardCharsets.UTF_16LE);
                offset += pathLen2;
                // log.fine(" " + rPath + "(RelativeLink)");
            }
        }
        if (type == Type.EMBEDDING || type == Type.STORAGE) {
            binDataID = (short) (buf[offset + 1] << 8 & 0xFF00 | buf[offset] & 0x00FF);
            offset += 2;
            // aPath =
            // docInfo.getParentHwp().getBinData().get(binDataID-1).getDirectoryEntryName().trim();
            itemId = String.valueOf(binDataID);
        }
        if (type == Type.EMBEDDING || type == Type.STORAGE) {
            int extLen = (buf[offset + 1] << 8 & 0xFF00 | buf[offset] & 0x00FF) * 2;
            offset += 2;
            if (extLen > 0) {
                format = new String(buf, offset, extLen, StandardCharsets.UTF_16LE);
                offset += extLen;
            }
            aPath = String.format("BIN%04X.%s", binDataID, format);
            log.fine("                                                  " + "ID=" + binDataID + "(" + aPath + ")");
        }

        if (offset - off - size != 0) {
            throw new HwpParseException();
        }
    }

    public HwpRecord_BinData(Node node, int version) {
        super(HwpTag.HWPTAG_BIN_DATA, 0, 0);

        NamedNodeMap attributes = node.getAttributes();

        itemId = attributes.getNamedItem("id").getNodeValue();

        Node tempNode = attributes.getNamedItem("isEmbeded");
        if (tempNode != null) {
            switch (tempNode.getNodeValue()) {
            case "0":
                type = Type.LINK;
                if (attributes.getNamedItem("sub-path") != null) {
                    aPath = attributes.getNamedItem("sub-path").getNodeValue();
                }
                if (aPath == null) {
                    aPath = attributes.getNamedItem("href").getNodeValue();
                }
                break;
            case "1":
                type = Type.EMBEDDING;
                aPath = attributes.getNamedItem("href").getNodeValue();
                break;
            }
        } else {
            aPath = attributes.getNamedItem("href").getNodeValue();
        }

        format = attributes.getNamedItem("media-type").getNodeValue();
        if (format.matches("image/(.*)")) {
            format = format.replaceAll("image/(.*)", "$1");
        }
    }

    public static enum Type {
        LINK        (0),
        EMBEDDING   (1),
        STORAGE     (2);

        private int type;

        private Type(int type) {
            this.type = type;
        }

        public static Type from(int type) {
            for (Type typeNum : values()) {
                if (typeNum.type == type)
                    return typeNum;
            }
            return null;
        }
    }

    public static enum Compressed {
        FOLLOW_STORAGE  (0x00),
        COMPRESS        (0x10),
        NO_COMPRESS     (0x20);

        private int comp;

        private Compressed(int comp) {
            this.comp = comp;
        }

        public static Compressed from(int comp) {
            for (Compressed compNum : values()) {
                if (compNum.comp == comp)
                    return compNum;
            }
            return null;
        }
    }

    public static enum State {
        NEVER_ACCESSED      (0x000),
        FOUND_FILE_BY_ACCESS(0x100),
        ACCESS_FAILED       (0x200),
        LINK_ACCESS_IGNORED (0x400);

        private int state;

        private State(int state) {
            this.state = state;
        }

        public static State from(int state) {
            for (State stateNum : values()) {
                if (stateNum.state == state)
                    return stateNum;
            }
            return null;
        }
    }

}