package com.projectsacrifice.game;

import android.app.Instrumentation;

import androidx.test.core.app.ActivityScenario;
import androidx.test.ext.junit.runners.AndroidJUnit4;
import androidx.test.platform.app.InstrumentationRegistry;

import org.junit.Test;
import org.junit.runner.RunWith;

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

/** Production-input acceptance coverage for the intended routes through levels 1-4. */
@RunWith(AndroidJUnit4.class)
public final class EarlyLevelPlaythroughTest {
    @Test
    public void levelOneProvesMovementAndJumpWithoutDeaths() {
        for (int pass = 1; pass <= 3; pass++) {
            LevelPlaytestBot.Result result = run(EarlyLevelScenarios.levelOne(), 20_000L);
            assertTrue(passDiagnostic(pass, result), result.completed());
            assertEquals("Pass " + pass + ": level 1 must not require a volunteer",
                    0, result.deaths());
        }
    }

    @Test
    public void levelTwoBuildsTheIntendedThreeCorpseBridge() {
        for (int pass = 1; pass <= 3; pass++) {
            LevelPlaytestBot.Result result = run(EarlyLevelScenarios.levelTwo(), 30_000L);
            assertTrue(passDiagnostic(pass, result), result.completed());
            assertEquals("Pass " + pass + ": the intended bridge uses three volunteers",
                    3, result.deaths());
            assertEquals("Pass " + pass + ": all three bridge bodies must remain",
                    3, result.corpseCount());
        }
    }

    @Test
    public void levelThreeLeavesASawCorpseOnThePlateAndOpensTheDoor() {
        for (int pass = 1; pass <= 3; pass++) {
            LevelPlaytestBot.Result result = run(EarlyLevelScenarios.levelThree(), 25_000L);
            assertTrue(passDiagnostic(pass, result), result.completed());
            assertEquals("Pass " + pass + ": the saw solution requires one volunteer",
                    1, result.deaths());
            assertEquals("Pass " + pass + ": the plate body must remain",
                    1, result.corpseCount());
            assertTrue("Pass " + pass + ": the corpse must keep the pressure door open",
                    result.doorOpened());
        }
    }

    @Test
    public void levelFourTogglesAndRidesTheLiftToTheUpperGallery() {
        for (int pass = 1; pass <= 3; pass++) {
            LevelPlaytestBot.Result result = run(EarlyLevelScenarios.levelFour(), 30_000L);
            assertTrue(passDiagnostic(pass, result), result.completed());
            assertEquals("Pass " + pass + ": the lift route must not require a volunteer",
                    0, result.deaths());
        }
    }

    private static String passDiagnostic(int pass, LevelPlaytestBot.Result result) {
        return "Consecutive pass " + pass + ": " + result.diagnostic();
    }

    private static LevelPlaytestBot.Result run(LevelPlaytestBot.Scenario scenario, long timeoutMillis) {
        try (ActivityScenario<MainActivity> activity = ActivityScenario.launch(MainActivity.class)) {
            final GameView[] view = new GameView[1];
            activity.onActivity(mainActivity -> view[0] = mainActivity.gameViewForAutomation());
            return new LevelPlaytestBot().run(
                    new AndroidDriver(InstrumentationRegistry.getInstrumentation(), view[0]),
                    scenario,
                    timeoutMillis
            );
        }
    }

    private static final class AndroidDriver implements LevelPlaytestBot.Driver {
        private final Instrumentation instrumentation;
        private final GameView gameView;

        AndroidDriver(Instrumentation instrumentation, GameView gameView) {
            this.instrumentation = instrumentation;
            this.gameView = gameView;
        }

        @Override
        public void startLevel(int oneBasedLevelNumber) {
            instrumentation.runOnMainSync(() -> gameView.startLevelForAutomation(oneBasedLevelNumber));
        }

        @Override
        public void setInput(boolean moveLeft, boolean moveRight, boolean jump) {
            instrumentation.runOnMainSync(() -> gameView.setAutomationInput(moveLeft, moveRight, jump));
        }

        @Override
        public GameView.AutomationSnapshot snapshot() {
            final GameView.AutomationSnapshot[] value = new GameView.AutomationSnapshot[1];
            instrumentation.runOnMainSync(() -> value[0] = gameView.automationSnapshot());
            return value[0];
        }

        @Override
        public void waitForNextDecision(long millis) {
            try {
                Thread.sleep(millis);
            } catch (InterruptedException interrupted) {
                Thread.currentThread().interrupt();
                throw new AssertionError("Early-level bot interrupted", interrupted);
            }
        }
    }
}