// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.actions;

import static org.junit.Assert.assertEquals;

import org.junit.BeforeClass;
import org.junit.Test;
import org.openstreetmap.josm.JOSMFixture;
import org.openstreetmap.josm.Main;
import org.openstreetmap.josm.data.coor.EastNorth;
import org.openstreetmap.josm.data.coor.LatLon;
import org.openstreetmap.josm.data.osm.DataSet;
import org.openstreetmap.josm.data.osm.Node;
import org.openstreetmap.josm.data.osm.Way;
import org.openstreetmap.josm.gui.layer.OsmDataLayer;
import org.openstreetmap.josm.io.OnlineResource;

/**
 * Unit tests for class AlignInLineAction.
 */
public final class AlignInLineActionTest {

    /** Class under test. */
    private static AlignInLineAction action;

    /**
     * Setup test.
     */
    @BeforeClass
    public static void setUp() {
        System.setProperty("josm.home", "test/config/unit-josm.home");
        JOSMFixture.createUnitTestFixture().init(true);

        // Enable "Align in line" feature.
        action = Main.main.menu.alignInLine;
        action.setEnabled(true);

        Main.setOffline(OnlineResource.ALL);
    }

    /**
     * Test case: only nodes selected, part of an open way: align these nodes on the line passing through the extremity
     * nodes (the most distant in the way sequence, not the most euclidean-distant). See
     * https://josm.openstreetmap.de/ticket/9605#comment:3. Note that in this test, after alignment, way is overlapping
     * itself.
     */
    @Test
    public void nodesOpenWay() {
        DataSet dataSet;
        OsmDataLayer layer;
        Node point1, point2, point3;

        dataSet = new DataSet();
        layer = new OsmDataLayer(dataSet, OsmDataLayer.createNewName(), null);

        // Create test points, lower left is (0,0).
        //
        // 1 - - -
        // - 3 - 2
        // - - - -
        point1 = new Node(new EastNorth(0, 2));
        point2 = new Node(new EastNorth(3, 1));
        point3 = new Node(new EastNorth(1, 1));

        try {
            Main.main.addLayer(layer);

            // Create an open way.
            createWay(dataSet, point1, point2, point3);

            // Select nodes to align.
            dataSet.addSelected(point1, point2, point3);

            action.actionPerformed(null);
        } finally {
            // Ensure we clean the place before leaving, even if test fails.
            Main.map.mapView.removeLayer(layer);
        }

        // Points 1 and 3 are the extremities and must not have moved. Only point 2 must have moved.
        assertCoordEq(point1, 0, 2);
        assertCoordEq(point2, 2, 0);
        assertCoordEq(point3, 1, 1);
    }

    /**
     * Test case: only nodes selected, part of a closed way: align these nodes on the line passing through the most
     * distant nodes.
     */
    @Test
    public void nodesClosedWay() {
        DataSet dataSet;
        OsmDataLayer layer;
        Node point1, point2, point3, point4;

        dataSet = new DataSet();
        layer = new OsmDataLayer(dataSet, OsmDataLayer.createNewName(), null);

        // Create test points, lower left is (0,0).
        //
        // 4 - 3
        // - - -
        // 1 - 2
        point1 = new Node(new EastNorth(0, 0));
        point2 = new Node(new EastNorth(2, 0));
        point3 = new Node(new EastNorth(2, 2));
        point4 = new Node(new EastNorth(0, 2));

        try {
            Main.main.addLayer(layer);

            // Create a closed way.
            createWay(dataSet, point1, point2, point3, point4, point1);
            // Select nodes to align (point1 must be in the second position to exhibit the bug).
            dataSet.addSelected(point4, point1, point2);

            action.actionPerformed(null);
        } finally {
            // Ensure we clean the place before leaving, even if test fails.
            Main.map.mapView.removeLayer(layer);
        }

        // Only point 1 must have moved.
        assertCoordEq(point1, 1, 1);
        assertCoordEq(point2, 2, 0);
        assertCoordEq(point3, 2, 2);
        assertCoordEq(point4, 0, 2);
    }

    /**
     * Test case: only nodes selected, part of multiple ways: align these nodes on the line passing through the most
     * distant nodes.
     */
    @Test
    public void nodesOpenWays() {
        DataSet dataSet;
        OsmDataLayer layer;
        Node point1, point2, point3, point4;

        dataSet = new DataSet();
        layer = new OsmDataLayer(dataSet, OsmDataLayer.createNewName(), null);

        // Create test points, lower left is (0,0).
        //
        // 1 - -
        // 3 - 2
        // - - 4
        point1 = new Node(new EastNorth(0, 2));
        point2 = new Node(new EastNorth(2, 1));
        point3 = new Node(new EastNorth(0, 1));
        point4 = new Node(new EastNorth(2, 0));

        try {
            Main.main.addLayer(layer);

            // Create 2 ways.
            createWay(dataSet, point1, point2);
            createWay(dataSet, point3, point4);

            // Select nodes to align.
            dataSet.addSelected(point1, point2, point3, point4);

            // Points must align between points 1 and 4.
            action.actionPerformed(null);
        } finally {
            // Ensure we clean the place before leaving, even if test fails.
            Main.map.mapView.removeLayer(layer);
        }

        assertCoordEq(point1, 0, 2);
        assertCoordEq(point2, 1.5, 0.5);
        assertCoordEq(point3, 0.5, 1.5);
        assertCoordEq(point4, 2, 0);
    }

    /**
     * Create a way made of the provided nodes and select nodes.
     *
     * @param dataSet Dataset in which adding nodes.
     * @param nodes List of nodes to add to dataset.
     */
    private void createWay(DataSet dataSet, Node... nodes) {
        Way way;

        way = new Way();
        dataSet.addPrimitive(way);

        for (Node node : nodes) {
            // Add primitive to dataset only if not already included.
            if (dataSet.getPrimitiveById(node) == null)
                dataSet.addPrimitive(node);

            way.addNode(node);
        }
    }

    /**
     * Assert that the provided node has the specified coordinates. If not fail the test.
     *
     * @param node Node to test.
     * @param x X coordinate.
     * @param y Y coordinate.
     */
    private void assertCoordEq(Node node, double x, double y) {
        EastNorth coordinate;

        coordinate = node.getEastNorth();
        assertEquals("Wrong x coordinate.", x, coordinate.getX(), LatLon.MAX_SERVER_PRECISION);
        assertEquals("Wrong y coordinate.", y, coordinate.getY(), LatLon.MAX_SERVER_PRECISION);
    }
}