package com.projectsacrifice.game;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertNotEquals;

import org.junit.Test;

public final class DeterministicInputTapeTest {
    @Test
    public void oneRecordedCommandTapeReplaysToTheSameTerminalSignature() {
        DeterministicInputTape tape = DeterministicInputTape.builder(2)
                .record(false, true, false, 16L)
                .record(false, true, true, 32L)
                .record(false, false, false, 16L)
                .build();

        FakeTarget first = new FakeTarget();
        FakeTarget second = new FakeTarget();

        assertEquals(tape.play(first), tape.play(second));
        assertEquals("level=2;ticks=64;mask=0", first.terminalSignature());
        assertEquals(3, tape.commands().size());
    }

    @Test
    public void tapeIdIsStableButChangesWithCommands() {
        DeterministicInputTape first = DeterministicInputTape.builder(1)
                .record(false, true, false, 16L).build();
        DeterministicInputTape same = DeterministicInputTape.builder(1)
                .record(false, true, false, 16L).build();
        DeterministicInputTape changed = DeterministicInputTape.builder(1)
                .record(false, true, true, 16L).build();

        assertEquals(first.id(), same.id());
        assertNotEquals(first.id(), changed.id());
    }

    @Test
    public void terminalStateSignatureIncludesPuzzleBytesAndCompletionFlags() {
        byte[] puzzle = {4, 8, 15, 16, 23, 42};

        assertEquals(ReplayStateSignature.of(puzzle, true, false),
                ReplayStateSignature.of(puzzle, true, false));
        assertNotEquals(ReplayStateSignature.of(puzzle, true, false),
                ReplayStateSignature.of(puzzle, false, false));
    }

    private static final class FakeTarget implements DeterministicInputTape.Target {
        private int level;
        private long ticks;
        private int mask;

        @Override
        public void startLevel(int oneBasedLevelNumber) { level = oneBasedLevelNumber; }

        @Override
        public void setInput(boolean left, boolean right, boolean jump) {
            mask = (left ? 1 : 0) | (right ? 2 : 0) | (jump ? 4 : 0);
        }

        @Override
        public void advance(long milliseconds) { ticks += milliseconds; }

        @Override
        public String terminalSignature() {
            return "level=" + level + ";ticks=" + ticks + ";mask=" + mask;
        }
    }
}