package com.rusefi.can.reader.impl;

import com.rusefi.can.CANPacket;
import com.rusefi.can.reader.CANLineReader;

import java.io.IOException;
import java.nio.file.Files;
import java.nio.file.Paths;
import java.util.List;

public class AutoFormatReader implements CANLineReader {
    public static final CANLineReader INSTANCE = new AutoFormatReader();

    private CANLineReader delegate;

    @Override
    public CANPacket readLine(String line) {
        return delegate.readLine(line);
    }

    @Override
    public CANPacket readLine(String line, String fileName, int lineIndex) {
        return delegate.readLine(line, fileName, lineIndex);
    }

    @Override
    public List<CANPacket> readFile(String fileName) throws IOException {
        String firstLine = Files.lines(Paths.get(fileName)).findFirst().get();
        if (!firstLine.contains(PcanTrcReader2_0.FILEVERSION) && !firstLine.contains(CanHackerReader.HEADER))
            throw new IllegalStateException(PcanTrcReader2_0.FILEVERSION + " expected in first line");
        if (firstLine.contains(CanHackerReader.HEADER)) {
            delegate = CanHackerReader.INSTANCE;
        } else if (firstLine.contains("1.1")) {
            delegate = PcanTrcReader1_1.INSTANCE;
        } else if (firstLine.contains("2.0")) {
            delegate = PcanTrcReader2_0.INSTANCE;
        } else {
            throw new IllegalStateException("Unsupported version in " + firstLine);
        }
        return delegate.readFile(fileName);
    }

    @Override
    public List<CANPacket> skipHeaderAndRead(String fileName, int skipCount) throws IOException {
        return delegate.skipHeaderAndRead(fileName, skipCount);
    }
}