/**
 * Copyright (c) 2014-present, Facebook, Inc.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

package com.facebook.yoga;

import static org.junit.Assert.assertEquals;
import static org.junit.Assert.assertFalse;
import static org.junit.Assert.assertNotSame;
import static org.junit.Assert.assertNull;
import static org.junit.Assert.assertTrue;
import static org.junit.Assert.fail;

import java.lang.ref.WeakReference;
import java.util.concurrent.atomic.AtomicBoolean;
import org.junit.Test;

public class YogaNodeTest {

  @Test
  public void testInit() {
    final int refCount = YogaNode.jni_YGNodeGetInstanceCount();
    final YogaNode node = new YogaNode();
    assertEquals(refCount + 1, YogaNode.jni_YGNodeGetInstanceCount());
  }

  @Test
  public void testBaseline() {
    final YogaNode root = new YogaNode();
    root.setFlexDirection(YogaFlexDirection.ROW);
    root.setAlignItems(YogaAlign.BASELINE);
    root.setWidth(100);
    root.setHeight(100);

    final YogaNode child1 = new YogaNode();
    child1.setWidth(40);
    child1.setHeight(40);
    root.addChildAt(child1, 0);

    final YogaNode child2 = new YogaNode();
    child2.setWidth(40);
    child2.setHeight(40);
    child2.setBaselineFunction(new YogaBaselineFunction() {
        public float baseline(YogaNode node, float width, float height) {
          return 0;
        }
    });
    root.addChildAt(child2, 1);

    root.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);

    assertEquals(0, (int) child1.getLayoutY());
    assertEquals(40, (int) child2.getLayoutY());
  }

  @Test
  public void testMeasure() {
    final YogaNode node = new YogaNode();
    node.setMeasureFunction(new YogaMeasureFunction() {
        public long measure(
            YogaNode node,
            float width,
            YogaMeasureMode widthMode,
            float height,
            YogaMeasureMode heightMode) {
          return YogaMeasureOutput.make(100, 100);
        }
    });
    node.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);
    assertEquals(100, (int) node.getLayoutWidth());
    assertEquals(100, (int) node.getLayoutHeight());
  }

  @Test
  public void testMeasureFloat() {
    final YogaNode node = new YogaNode();
    node.setMeasureFunction(new YogaMeasureFunction() {
        public long measure(
            YogaNode node,
            float width,
            YogaMeasureMode widthMode,
            float height,
            YogaMeasureMode heightMode) {
          return YogaMeasureOutput.make(100.5f, 100.5f);
        }
    });
    node.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);
    assertEquals(101f, node.getLayoutWidth(), 0.01f);
    assertEquals(101f, node.getLayoutHeight(), 0.01f);
  }

  @Test
  public void testMeasureFloatMin() {
    final YogaNode node = new YogaNode();
    node.setMeasureFunction(new YogaMeasureFunction() {
        public long measure(
            YogaNode node,
            float width,
            YogaMeasureMode widthMode,
            float height,
            YogaMeasureMode heightMode) {
          return YogaMeasureOutput.make(Float.MIN_VALUE, Float.MIN_VALUE);
        }
    });
    node.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);
    assertEquals(Float.MIN_VALUE, node.getLayoutWidth(), 0.01f);
    assertEquals(Float.MIN_VALUE, node.getLayoutHeight(), 0.01f);
  }

  @Test
  public void testMeasureFloatBigNumber() {
    final YogaNode node = new YogaNode();
    final float bigNumber = (float) 10E5;
    node.setMeasureFunction(
        new YogaMeasureFunction() {
          public long measure(
              YogaNode node,
              float width,
              YogaMeasureMode widthMode,
              float height,
              YogaMeasureMode heightMode) {
            return YogaMeasureOutput.make(bigNumber, bigNumber);
          }
        });
    node.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);
    assertEquals(bigNumber, node.getLayoutWidth(), 0.01f);
    assertEquals(bigNumber, node.getLayoutHeight(), 0.01f);
  }

  @Test
  public void testCopyStyle() {
    final YogaNode node0 = new YogaNode();
    assertTrue(YogaConstants.isUndefined(node0.getMaxHeight()));

    final YogaNode node1 = new YogaNode();
    node1.setMaxHeight(100);

    node0.copyStyle(node1);
    assertEquals(100, (int) node0.getMaxHeight().value);
  }

  @Test
  public void testLayoutMargin() {
    final YogaNode node = new YogaNode();
    node.setWidth(100);
    node.setHeight(100);
    node.setMargin(YogaEdge.START, 1);
    node.setMargin(YogaEdge.END, 2);
    node.setMargin(YogaEdge.TOP, 3);
    node.setMargin(YogaEdge.BOTTOM, 4);
    node.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);

    assertEquals(1, (int) node.getLayoutMargin(YogaEdge.LEFT));
    assertEquals(2, (int) node.getLayoutMargin(YogaEdge.RIGHT));
    assertEquals(3, (int) node.getLayoutMargin(YogaEdge.TOP));
    assertEquals(4, (int) node.getLayoutMargin(YogaEdge.BOTTOM));
  }

  @Test
  public void testLayoutPadding() {
    final YogaNode node = new YogaNode();
    node.setWidth(100);
    node.setHeight(100);
    node.setPadding(YogaEdge.START, 1);
    node.setPadding(YogaEdge.END, 2);
    node.setPadding(YogaEdge.TOP, 3);
    node.setPadding(YogaEdge.BOTTOM, 4);
    node.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);

    assertEquals(1, (int) node.getLayoutPadding(YogaEdge.LEFT));
    assertEquals(2, (int) node.getLayoutPadding(YogaEdge.RIGHT));
    assertEquals(3, (int) node.getLayoutPadding(YogaEdge.TOP));
    assertEquals(4, (int) node.getLayoutPadding(YogaEdge.BOTTOM));
  }

  @Test
  public void testLayoutBorder() {
    final YogaNode node = new YogaNode();
    node.setWidth(100);
    node.setHeight(100);
    node.setBorder(YogaEdge.START, 1);
    node.setBorder(YogaEdge.END, 2);
    node.setBorder(YogaEdge.TOP, 3);
    node.setBorder(YogaEdge.BOTTOM, 4);
    node.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);

    assertEquals(1, (int) node.getLayoutBorder(YogaEdge.LEFT));
    assertEquals(2, (int) node.getLayoutBorder(YogaEdge.RIGHT));
    assertEquals(3, (int) node.getLayoutBorder(YogaEdge.TOP));
    assertEquals(4, (int) node.getLayoutBorder(YogaEdge.BOTTOM));
  }

  @Test
  public void testUseWebDefaults() {
    final YogaConfig config = new YogaConfig();
    config.setUseWebDefaults(true);
    final YogaNode node = new YogaNode(config);
    assertEquals(YogaFlexDirection.ROW, node.getFlexDirection());
  }

  @Test
  public void testPercentPaddingOnRoot() {
    final YogaNode node = new YogaNode();
    node.setPaddingPercent(YogaEdge.ALL, 10);
    node.calculateLayout(50, 50);

    assertEquals(5, (int) node.getLayoutPadding(YogaEdge.LEFT));
    assertEquals(5, (int) node.getLayoutPadding(YogaEdge.RIGHT));
    assertEquals(5, (int) node.getLayoutPadding(YogaEdge.TOP));
    assertEquals(5, (int) node.getLayoutPadding(YogaEdge.BOTTOM));
  }

  @Test
  public void testDefaultEdgeValues() {
    final YogaNode node = new YogaNode();

    for (YogaEdge edge : YogaEdge.values()) {
      assertEquals(YogaUnit.UNDEFINED, node.getMargin(edge).unit);
      assertEquals(YogaUnit.UNDEFINED, node.getPadding(edge).unit);
      assertEquals(YogaUnit.UNDEFINED, node.getPosition(edge).unit);
      assertTrue(YogaConstants.isUndefined(node.getBorder(edge)));
    }
  }

  @Test
  public void testCloneNode() throws Exception {
    YogaConfig config = new YogaConfig();
    YogaNode root = new YogaNode(config);
    YogaNode child = new YogaNode(config);
    YogaNode grandChild = new YogaNode(config);
    root.addChildAt(child, 0);
    child.addChildAt(grandChild, 0);
    child.setFlexDirection(YogaFlexDirection.ROW);

    YogaNode clonedChild = child.clone();

    assertNotSame(clonedChild, child);

    assertEquals(YogaFlexDirection.ROW, child.getFlexDirection());
    assertEquals(child.getFlexDirection(), clonedChild.getFlexDirection());

    // Verify the cloning is shallow on the List of children
    assertEquals(1, child.getChildCount());
    assertEquals(child.getChildCount(), clonedChild.getChildCount());
    assertEquals(child.getChildAt(0), clonedChild.getChildAt(0));

    child.removeChildAt(0);
    assertEquals(0, child.getChildCount());
    assertEquals(1, clonedChild.getChildCount());
  }

  @Test
  public void testCloneWithNewChildren() throws Exception {
    YogaConfig config = new YogaConfig();
    YogaNode root = new YogaNode(config);
    YogaNode child = new YogaNode(config);
    YogaNode grandChild = new YogaNode(config);
    root.addChildAt(child, 0);
    child.addChildAt(grandChild, 0);
    child.setFlexDirection(YogaFlexDirection.ROW);

    YogaNode clonedChild = child.cloneWithNewChildren();

    assertNotSame(clonedChild, child);
    assertEquals(YogaFlexDirection.ROW, clonedChild.getFlexDirection());
    assertEquals(child.getFlexDirection(), clonedChild.getFlexDirection());
    assertEquals(0, clonedChild.getChildCount());
    assertEquals(1, child.getChildCount());
  }

  @Test
  public void testAddSharedChildCloneWithNewChildren() throws Exception {
    YogaConfig config = new YogaConfig();
    YogaNode root = new YogaNode(config);
    YogaNode child = new YogaNode(config);
    YogaNode grandChild = new YogaNode(config);
    root.addChildAt(child, 0);
    child.addChildAt(grandChild, 0);
    child.setFlexDirection(YogaFlexDirection.ROW);

    YogaNode clonedChild = child.cloneWithNewChildren();

    assertNotSame(clonedChild, child);
    assertEquals(YogaFlexDirection.ROW, clonedChild.getFlexDirection());
    assertEquals(child.getFlexDirection(), clonedChild.getFlexDirection());
    assertEquals(0, clonedChild.getChildCount());
    assertEquals(1, child.getChildCount());

    clonedChild.addSharedChildAt(grandChild, 0);
    assertEquals(1, clonedChild.getChildCount());
    assertNull(grandChild.getOwner());
  }

  @Test
  public void testCloneNodeListener() throws Exception {
    final AtomicBoolean onNodeClonedExecuted = new AtomicBoolean(false);
    YogaConfig config = new YogaConfig();
    config.setOnCloneNode(
        new YogaNodeCloneFunction() {
          @Override
          public YogaNode cloneNode(YogaNode oldNode, YogaNode owner, int childIndex) {
            onNodeClonedExecuted.set(true);
            return oldNode.clone();
          }
        });
    YogaNode root = new YogaNode(config);
    root.setWidth(100f);
    root.setHeight(100f);
    YogaNode child0 = new YogaNode(config);
    root.addChildAt(child0, 0);
    child0.setWidth(50f);
    root.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);

    // Force a clone to happen.
    final YogaNode root2 = root.clone();
    root2.setWidth(200f);
    root2.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);

    assertTrue(onNodeClonedExecuted.get());
    assertEquals(1, root2.getChildCount());
    YogaNode clonedNode = root2.getChildAt(0);
    assertNotSame(child0, clonedNode);
    assertEquals(child0.getWidth(), clonedNode.getWidth());
    assertEquals(50f, clonedNode.getWidth().value, 0.01f);
  }

  @Test
  public void testOnNodeClonedLeak() throws Exception {
    YogaConfig config = new YogaConfig();
    config.setOnCloneNode(
        new YogaNodeCloneFunction() {
          @Override
          public YogaNode cloneNode(YogaNode oldNode, YogaNode owner, int childIndex) {
            return oldNode.clone();
          }
        });
    config.setOnCloneNode(null);
    WeakReference<Object> ref = new WeakReference<Object>(config);
    // noinspection UnusedAssignment
    config = null;
    // try and free for the next 5 seconds, usually it works after the
    // first GC attempt.
    for (int i = 0; i < 50; i++) {
      System.gc();
      if (ref.get() == null) {
        // free successfully
        return;
      }
      Thread.sleep(100);
    }
    fail("YogaConfig leaked");
  }

  @Test
  public void testFlagShouldDiffLayoutWithoutLegacyStretchBehaviour() throws Exception {
    YogaConfig config = new YogaConfig();
    config.setShouldDiffLayoutWithoutLegacyStretchBehaviour(true);
    config.setUseLegacyStretchBehaviour(true);
    YogaNode root = new YogaNode(config);
    root.setWidth(500);
    root.setHeight(500);
    YogaNode root_child0 = new YogaNode(config);
    root_child0.setAlignItems(YogaAlign.FLEX_START);
    root.addChildAt(root_child0, 0);
    YogaNode root_child0_child0 = new YogaNode(config);
    root_child0_child0.setFlexGrow(1);
    root_child0_child0.setFlexShrink(1);
    root_child0.addChildAt(root_child0_child0, 0);
    YogaNode root_child0_child0_child0 = new YogaNode(config);
    root_child0_child0_child0.setFlexGrow(1);
    root_child0_child0_child0.setFlexShrink(1);
    root_child0_child0.addChildAt(root_child0_child0_child0, 0);
    root.calculateLayout(YogaConstants.UNDEFINED, YogaConstants.UNDEFINED);
    assertFalse(root.getDoesLegacyStretchFlagAffectsLayout());
  }
}