package input;

public class InputBuffer {
	
	private static final Boolean[] baseInputs = {false,false,false,false,false,false,false,false};
	
	/**
	 * a list of various inputs being recorded, such as inputs pressed at each frame
	 * Each element is a tab where each element represent a possible input 
	 * (UP, Down, Right, Left, A, B, C, D)
	 * if the value at the corresponding index is true, then the input is pressed
	 * By default, no input is pressed. 
	 */
	private Boolean[][] inputList;
	
	/*
	 * the size of the input buffer
	 */
	private int size;
	
	/*
	 * the current position in the tab of the last newest input recorded
	 * This should never bee accessed outside of this class.
	 */
	private int pos;
	
	
	/**
	 * base constructor of the InputBuffer. Creates a buffer of size 1, with every input empty
	 */
	public InputBuffer() {
		this.size = 1;
		this.pos = 0;
		this.inputList = new Boolean[1][numberOfInputs];
		setLatestInputs(baseInputs);
	}
	
	public InputBuffer(int size) {
		this.size = size;
		this.pos = 0;
		this.inputList = new Boolean[this.size][numberOfInputs];
		
		for(int i = 0; i < this.size; i++) {
			for(int j = 0; j < numberOfInputs; j++) {
				this.inputList[i][j] = baseInputs[j];}
			}
	}
	

	
	/**
	 * @return the latest added inputs
	 */
	public Boolean[] getLatestInputs() {
		return this.inputList[this.pos];
	}
	
	
	/**
	 * Sets the last input without moving the current position
	 * @param inputs
	 */
	private void setLatestInputs(Boolean[] inputs) {
		try {
			for(int i = 0; i < 8; i++) {
				this.inputList[pos][i] = inputs[i];
			}
		} catch (ArrayIndexOutOfBoundsException e) { //TODO :  what do we do in this case ?
		}
	}
	
	/**
	 * advances the current position to the next one (goes back to the first if at the end
	 */
	private void nextPos() {
		this.pos++;
		if(this.pos == size) {this.pos = 0;}
	}
	
	/**
	 * record a new input in the 
	 * @param inputs a size 8 tab of inputs
	 */
	private void recordInputs(Boolean[] inputs) {
		this.nextPos();
		this.setLatestInputs(inputs);
	}
}