package eu.siacs.conversations.entities;

import android.util.Log;
import eu.siacs.conversations.Config;
import eu.siacs.conversations.utils.MimeUtils;
import java.io.File;

public class DownloadableFile extends File {

    private static final long serialVersionUID = 2247012619505115863L;

    private long expectedSize = 0;
    private byte[] aeskey;
    private byte[] iv;

    public DownloadableFile(final File parent, final String file) {
        super(parent, file);
    }

    public DownloadableFile(String path) {
        super(path);
    }

    public long getSize() {
        return super.length();
    }

    public long getExpectedSize() {
        return this.expectedSize;
    }

    public String getMimeType() {
        String path = this.getAbsolutePath();
        int start = path.lastIndexOf('.') + 1;
        if (start < path.length()) {
            String mime = MimeUtils.guessMimeTypeFromExtension(path.substring(start));
            return mime == null ? "" : mime;
        } else {
            return "";
        }
    }

    public void setExpectedSize(long size) {
        this.expectedSize = size;
    }

    public void setKeyAndIv(byte[] keyIvCombo) {
        // originally, we used a 16 byte IV, then found for aes-gcm a 12 byte IV is ideal
        // this code supports reading either length, with sending 12 byte IV to be done in future
        if (keyIvCombo.length == 48) {
            this.aeskey = new byte[32];
            this.iv = new byte[16];
            System.arraycopy(keyIvCombo, 0, this.iv, 0, 16);
            System.arraycopy(keyIvCombo, 16, this.aeskey, 0, 32);
        } else if (keyIvCombo.length == 44) {
            this.aeskey = new byte[32];
            this.iv = new byte[12];
            System.arraycopy(keyIvCombo, 0, this.iv, 0, 12);
            System.arraycopy(keyIvCombo, 12, this.aeskey, 0, 32);
        } else if (keyIvCombo.length >= 32) {
            this.aeskey = new byte[32];
            this.iv =
                    new byte[] {
                        0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08, 0x09, 0x0a, 0x0b,
                        0x0c, 0x0d, 0x0e, 0xf
                    };
            System.arraycopy(keyIvCombo, 0, aeskey, 0, 32);
        }
        Log.d(Config.LOGTAG, "using " + this.iv.length + "-byte IV for file transmission");
    }

    public void setKey(byte[] key) {
        this.aeskey = key;
    }

    public void setIv(byte[] iv) {
        this.iv = iv;
    }

    public byte[] getKey() {
        return this.aeskey;
    }

    public byte[] getIv() {
        return this.iv;
    }
}