package rs.raf.os.test;

import rs.raf.os.fat.FAT16;
import rs.raf.os.fat.FATException;

public class MockFAT implements FAT16 {

    private int clusterWidth;
    private int clusterCount;
    private int[] clusterData;

    public MockFAT(int clusterWidth) {
        this.clusterWidth = clusterWidth;
        this.clusterCount = 0xFFED;
    }

    public MockFAT(int clusterWidth, int clusterCount) {
        if (clusterCount > 0xFFED) {
            System.err.println("Uneo si mnogo brt " + clusterCount);
            this.clusterCount = 0xFFED;
        }

        this.clusterWidth = clusterWidth;
        this.clusterCount = clusterCount;
        this.clusterData = new int[clusterCount + 2];
    }

    @Override
    public int getEndOfChain() {
        return 0xFFF8;
    }

    @Override
    public int getClusterCount() {
        return clusterCount;
    }

    @Override
    public int getClusterWidth() {
        return clusterWidth;
    }

    @Override
    public int readCluster(int clusterID) throws FATException {
        if (clusterID < 2 || clusterID >= clusterData.length) {
            throw new FATException("Ne valja read");
        }

        return clusterData[clusterID];
    }

    @Override
    public void writeCluster(int clusterID, int valueToWrite) throws FATException {
        if (clusterID < 2 || clusterID >= clusterData.length) {
            throw new FATException("Ne valja write");
        }

        if (valueToWrite > 0xFFED && valueToWrite != 0xFFF8) {
            throw new FATException("Ne valja write 2");
        }

        clusterData[clusterID] = valueToWrite;
    }

    @Override
    public String getString() {
        StringBuilder sb = new StringBuilder();
        sb.append("[");

        for (int i = 2; i < clusterData.length - 1; i++)
            sb.append(clusterData[i] + "|");

        sb.append(clusterData[clusterData.length - 1] + "]");
        return sb.toString();
    }

}