package com.googlecode.lanterna.input;

import com.googlecode.lanterna.TerminalPosition;

import java.util.List;

/**
 * Pattern used to detect Xterm-protocol mouse events coming in on the standard input channel
 * Created by martin on 19/07/15.
 * 
 * @author Martin, Andreas
 */
public class MouseCharacterPattern implements CharacterPattern {
    private static final char[] PATTERN = { KeyDecodingProfile.ESC_CODE, '[', 'M' };

    @Override
    public Matching match(List<Character> seq) {
        int size = seq.size();
        if (size > 6) {
            return null; // nope
        }
        // check first 3 chars:
        for (int i = 0; i < 3; i++) {
            if ( i >= size ) {
                return Matching.NOT_YET; // maybe later
            }
            if ( seq.get(i) != PATTERN[i] ) {
                return null; // nope
            }
        }
        if (size < 6) {
            return Matching.NOT_YET; // maybe later
        }
        MouseActionType actionType = null;
        int button = (seq.get(3) & 0x3) + 1;
        if(button == 4) {
            //If last two bits are both set, it means button click release
            button = 0;
        }
        int actionCode = (seq.get(3) & 0x60) >> 5;
        switch(actionCode) {
            case(1):
                if(button > 0) {
                    actionType = MouseActionType.CLICK_DOWN;
                }
                else {
                    actionType = MouseActionType.CLICK_RELEASE;
                }
                break;
            case(2):
                if(button == 0) {
                    actionType = MouseActionType.MOVE;
                }
                else {
                    actionType = MouseActionType.DRAG;
                }
                break;
            case(3):
                if(button == 1) {
                    actionType = MouseActionType.SCROLL_UP;
                    button = 4;
                }
                else {
                    actionType = MouseActionType.SCROLL_DOWN;
                    button = 5;
                }
                break;
        }
        TerminalPosition pos = new TerminalPosition( seq.get(4) - 33, seq.get(5) - 33 );

        MouseAction ma = new MouseAction(actionType, button, pos );
        return new Matching( ma ); // yep
    }
}