package com.projectsacrifice.game;

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

import org.junit.Rule;
import org.junit.Test;
import org.junit.rules.TemporaryFolder;

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;

public final class LevelContentToolTest {
    @Rule public final TemporaryFolder temporary = new TemporaryFolder();

    @Test
    public void validateCommandLoadsARealDirectoryAndReportsVersions() throws Exception {
        Path levels = temporary.newFolder("levels").toPath();
        writeFixture(levels);
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        ByteArrayOutputStream errors = new ByteArrayOutputStream();

        int exitCode = LevelContentTool.run(
                new String[]{"validate", levels.toString()},
                new PrintStream(output, true, StandardCharsets.UTF_8),
                new PrintStream(errors, true, StandardCharsets.UTF_8));

        assertEquals(0, exitCode);
        assertEquals("Validated 1 level(s); format=1; physics=1\n",
                output.toString(StandardCharsets.UTF_8));
        assertEquals("", errors.toString(StandardCharsets.UTF_8));
    }

    @Test
    public void previewCommandProducesByteIdenticalSvgAndCoordinateExport() throws Exception {
        Path levels = temporary.newFolder("preview-levels").toPath();
        Path first = temporary.newFolder("preview-first").toPath();
        Path second = temporary.newFolder("preview-second").toPath();
        writeFixture(levels);

        assertEquals(0, LevelContentTool.run(
                new String[]{"preview", levels.toString(), first.toString()},
                new PrintStream(new ByteArrayOutputStream()),
                new PrintStream(new ByteArrayOutputStream())));
        assertEquals(0, LevelContentTool.run(
                new String[]{"preview", levels.toString(), second.toString()},
                new PrintStream(new ByteArrayOutputStream()),
                new PrintStream(new ByteArrayOutputStream())));

        byte[] firstSvg = Files.readAllBytes(first.resolve("level-01.svg"));
        byte[] secondSvg = Files.readAllBytes(second.resolve("level-01.svg"));
        assertArrayEquals(firstSvg, secondSvg);
        assertArrayEquals(Files.readAllBytes(first.resolve("catalog.tsv")),
                Files.readAllBytes(second.resolve("catalog.tsv")));
        String svg = new String(firstSvg, StandardCharsets.UTF_8);
        assertTrue(svg, svg.contains("viewBox=\"0 0 1920 1080\""));
        assertTrue(svg, svg.contains("data-kind=\"spawn\""));
        assertTrue(svg, svg.contains("data-kind=\"goal\""));
        assertTrue(svg, svg.contains("data-kind=\"object-COUNTERWEIGHT\""));
        String coordinates = Files.readString(first.resolve("catalog.tsv"));
        assertTrue(coordinates, coordinates.contains("1\tobject\t0\tCOUNTERWEIGHT"));
        assertTrue(coordinates, coordinates.contains("mass=3"));
    }

    private static void writeFixture(Path levels) throws Exception {
        Files.writeString(levels.resolve("index.json"),
                "{\"formatVersion\":1,\"physicsVersion\":1,\"levels\":[\"level-01.json\"]}");
        Files.writeString(levels.resolve("level-01.json"), validLevelJson());
    }

    private static String validLevelJson() {
        return "{\"formatVersion\":1,\"physicsVersion\":1,\"number\":1,"
                + "\"copy\":{\"en\":{\"title\":\"Test\",\"hint\":\"Go.\"},"
                + "\"ru\":{\"title\":\"Тест\",\"hint\":\"Идите.\"}},"
                + "\"world\":{\"width\":1920,\"height\":1080},"
                + "\"spawn\":{\"x\":130,\"y\":760},"
                + "\"goal\":{\"x\":1690,\"y\":770,\"width\":86,\"height\":110},"
                + "\"targets\":{\"deaths\":0,\"seconds\":30},"
                + "\"objects\":[{\"type\":\"COUNTERWEIGHT\","
                + "\"box\":{\"x\":700,\"y\":780,\"width\":80,\"height\":100},"
                + "\"mass\":3}],"
                + "\"platforms\":[{\"box\":{\"x\":0,\"y\":880,\"width\":1920,\"height\":200}}],"
                + "\"hazards\":[],\"switches\":[],\"doors\":[]}";
    }
}