package ovh.gasser.newshapes.shapes;

import org.junit.jupiter.api.Nested;
import org.junit.jupiter.api.Test;

import java.awt.Color;
import java.awt.Point;

import static org.junit.jupiter.api.Assertions.*;

/**
 * Tests bounds-based hit-testing for all shape types.
 * Hit-testing is performed via {@code shape.getBounds().contains(Point)},
 * delegating to {@link java.awt.Rectangle#contains(Point)}.
 *
 * <p>Note on {@link java.awt.Rectangle#contains} boundary semantics:
 * A rectangle {@code (x, y, w, h)} contains a point {@code (px, py)} when:
 * {@code x <= px < x+w} and {@code y <= py < y+h}.
 * The top-left corner is <em>inclusive</em>; the bottom-right corner is <em>exclusive</em>.
 */
class ContainsPointTest {

    // -----------------------------------------------------------------------
    // SRectangle — bounds = (x, y, width, height)
    // -----------------------------------------------------------------------

    @Nested
    class SRectangleContainsPoint {

        // Shape: origin (10, 20), size 80×60  →  right-exclusive: x=90, y=80
        private final SRectangle rect = SRectangle.create(10, 20, 80, 60);

        @Test
        void pointInsideShouldBeContained() {
            Point inside = new Point(50, 50);
            assertTrue(rect.getBounds().contains(inside),
                    "A point clearly inside the rectangle should be contained");
        }

        @Test
        void pointOutsideShouldNotBeContained() {
            Point outside = new Point(5, 5);
            assertFalse(rect.getBounds().contains(outside),
                    "A point outside the rectangle should not be contained");
        }

        @Test
        void pointFarOutsideShouldNotBeContained() {
            Point farOutside = new Point(200, 300);
            assertFalse(rect.getBounds().contains(farOutside),
                    "A point far outside the rectangle should not be contained");
        }

        @Test
        void topLeftCornerShouldBeContained() {
            // Rectangle.contains is inclusive of the top-left corner
            Point topLeft = new Point(10, 20);
            assertTrue(rect.getBounds().contains(topLeft),
                    "The top-left corner (inclusive boundary) should be contained");
        }

        @Test
        void bottomRightCornerShouldNotBeContained() {
            // Rectangle.contains is exclusive of the bottom-right corner
            Point bottomRight = new Point(90, 80); // x + width, y + height
            assertFalse(rect.getBounds().contains(bottomRight),
                    "The bottom-right corner (exclusive boundary) should not be contained");
        }

        @Test
        void pointJustInsideBottomRightShouldBeContained() {
            Point justInside = new Point(89, 79); // one pixel before exclusive boundary
            assertTrue(rect.getBounds().contains(justInside),
                    "A point one pixel before the bottom-right boundary should be contained");
        }

        @Test
        void pointAfterTranslateShouldBeAtNewPosition() {
            SRectangle moved = SRectangle.create(10, 20, 80, 60);
            moved.translate(30, 40); // new bounds: (40, 60, 80, 60)

            Point oldCenter = new Point(50, 50);
            assertFalse(moved.getBounds().contains(oldCenter),
                    "After translate, old center should no longer be contained");

            Point newCenter = new Point(80, 90);
            assertTrue(moved.getBounds().contains(newCenter),
                    "After translate, a point at the new center should be contained");
        }

        @Test
        void pointOnTopEdgeShouldBeContained() {
            Point topEdge = new Point(50, 20); // y == rect.y, inside x range
            assertTrue(rect.getBounds().contains(topEdge),
                    "A point on the top edge should be contained");
        }

        @Test
        void pointOnLeftEdgeShouldBeContained() {
            Point leftEdge = new Point(10, 50); // x == rect.x, inside y range
            assertTrue(rect.getBounds().contains(leftEdge),
                    "A point on the left edge should be contained");
        }

        @Test
        void pointOnRightEdgeShouldNotBeContained() {
            Point rightEdge = new Point(90, 50); // x == rect.x + rect.width (exclusive)
            assertFalse(rect.getBounds().contains(rightEdge),
                    "A point exactly on the right edge (exclusive) should not be contained");
        }

        @Test
        void pointOnBottomEdgeShouldNotBeContained() {
            Point bottomEdge = new Point(50, 80); // y == rect.y + rect.height (exclusive)
            assertFalse(rect.getBounds().contains(bottomEdge),
                    "A point exactly on the bottom edge (exclusive) should not be contained");
        }
    }

    // -----------------------------------------------------------------------
    // SCircle — bounds = (x, y, radius*2, radius*2)
    // -----------------------------------------------------------------------

    @Nested
    class SCircleContainsPoint {

        // Shape: origin (20, 30), radius=40  →  bounds (20, 30, 80, 80)
        // right-exclusive corner: (100, 110)
        private final SCircle circle = SCircle.create(20, 30, 40);

        @Test
        void pointInsideBoundsShouldBeContained() {
            Point inside = new Point(60, 70);
            assertTrue(circle.getBounds().contains(inside),
                    "A point inside the bounding box should be contained");
        }

        @Test
        void pointOutsideBoundsShouldNotBeContained() {
            Point outside = new Point(10, 10);
            assertFalse(circle.getBounds().contains(outside),
                    "A point outside the bounding box should not be contained");
        }

        @Test
        void topLeftCornerShouldBeContained() {
            Point topLeft = new Point(20, 30);
            assertTrue(circle.getBounds().contains(topLeft),
                    "The top-left corner of the bounding box (inclusive) should be contained");
        }

        @Test
        void bottomRightCornerShouldNotBeContained() {
            Point bottomRight = new Point(100, 110); // x + 2r, y + 2r
            assertFalse(circle.getBounds().contains(bottomRight),
                    "The bottom-right corner of the bounding box (exclusive) should not be contained");
        }

        @Test
        void pointAfterTranslateShouldBeAtNewPosition() {
            SCircle moved = SCircle.create(20, 30, 40);
            moved.translate(50, 50); // new bounds: (70, 80, 80, 80)

            Point oldCenter = new Point(60, 70);
            assertFalse(moved.getBounds().contains(oldCenter),
                    "After translate, old center should no longer be contained");

            Point newCenter = new Point(110, 120);
            assertTrue(moved.getBounds().contains(newCenter),
                    "After translate, a point at the new center should be contained");
        }
    }

    // -----------------------------------------------------------------------
    // STriangle — bounds = (x, y, size, size)
    // -----------------------------------------------------------------------

    @Nested
    class STriangleContainsPoint {

        // Shape: origin (5, 15), size=60  →  bounds (5, 15, 60, 60)
        // right-exclusive corner: (65, 75)
        private final STriangle triangle = STriangle.create(5, 15, 60, Color.RED, Color.BLACK);

        @Test
        void pointInsideBoundsShouldBeContained() {
            Point inside = new Point(35, 45);
            assertTrue(triangle.getBounds().contains(inside),
                    "A point inside the bounding box should be contained");
        }

        @Test
        void pointOutsideBoundsShouldNotBeContained() {
            Point outside = new Point(0, 0);
            assertFalse(triangle.getBounds().contains(outside),
                    "A point outside the bounding box should not be contained");
        }

        @Test
        void topLeftCornerShouldBeContained() {
            Point topLeft = new Point(5, 15);
            assertTrue(triangle.getBounds().contains(topLeft),
                    "The top-left corner of the bounding box (inclusive) should be contained");
        }

        @Test
        void bottomRightCornerShouldNotBeContained() {
            Point bottomRight = new Point(65, 75); // x + size, y + size
            assertFalse(triangle.getBounds().contains(bottomRight),
                    "The bottom-right corner of the bounding box (exclusive) should not be contained");
        }

        @Test
        void pointAfterTranslateShouldBeAtNewPosition() {
            STriangle moved = STriangle.create(5, 15, 60, Color.RED, Color.BLACK);
            moved.translate(100, 100); // new bounds: (105, 115, 60, 60)

            Point oldCenter = new Point(35, 45);
            assertFalse(moved.getBounds().contains(oldCenter),
                    "After translate, old center should no longer be contained");

            Point newCenter = new Point(135, 145);
            assertTrue(moved.getBounds().contains(newCenter),
                    "After translate, a point at the new center should be contained");
        }
    }

    // -----------------------------------------------------------------------
    // SText — bounds = (x, y, 100, 20)
    // -----------------------------------------------------------------------

    @Nested
    class STextContainsPoint {

        // Shape: origin (50, 100)  →  bounds (50, 100, 100, 20)
        // right-exclusive corner: (150, 120)
        private final SText text = SText.create(50, 100, "Hello");

        @Test
        void pointInsideBoundsShouldBeContained() {
            Point inside = new Point(100, 110);
            assertTrue(text.getBounds().contains(inside),
                    "A point inside the default text bounding box should be contained");
        }

        @Test
        void pointOutsideBoundsShouldNotBeContained() {
            Point outside = new Point(10, 10);
            assertFalse(text.getBounds().contains(outside),
                    "A point outside the text bounding box should not be contained");
        }

        @Test
        void topLeftCornerShouldBeContained() {
            Point topLeft = new Point(50, 100);
            assertTrue(text.getBounds().contains(topLeft),
                    "The top-left corner of the text bounding box (inclusive) should be contained");
        }

        @Test
        void bottomRightCornerShouldNotBeContained() {
            // Default bounds width=100, height=20  →  exclusive corner at (150, 120)
            Point bottomRight = new Point(150, 120);
            assertFalse(text.getBounds().contains(bottomRight),
                    "The bottom-right corner of the text bounding box (exclusive) should not be contained");
        }

        @Test
        void pointJustBeforeBottomRightShouldBeContained() {
            Point justInside = new Point(149, 119);
            assertTrue(text.getBounds().contains(justInside),
                    "A point one pixel before the exclusive bottom-right boundary should be contained");
        }

        @Test
        void pointAfterTranslateShouldBeAtNewPosition() {
            // Original bounds: (50, 100, 100, 20) — covers x∈[50,150), y∈[100,120)
            SText moved = SText.create(50, 100, "Hello");
            moved.translate(-40, 10); // new bounds: (10, 110, 100, 20) — covers x∈[10,110), y∈[110,130)

            // (130, 105) was inside original bounds but is now outside (x=130 >= 110, y=105 < 110)
            Point oldPosition = new Point(130, 105);
            assertFalse(moved.getBounds().contains(oldPosition),
                    "After translate, a point that was in the old bounds should no longer be contained");

            // (50, 115) is inside new bounds: x∈[10,110), y∈[110,130) ✓
            Point newPosition = new Point(50, 115);
            assertTrue(moved.getBounds().contains(newPosition),
                    "After translate, a point in the new bounds should be contained");
        }

        @Test
        void blankTextUsesDefaultPlaceholderAndSameBounds() {
            // Even blank/null text falls back to the placeholder — bounds remain (x, y, 100, 20)
            SText blankText = SText.create(0, 0, "");
            Point inside = new Point(50, 10);
            assertTrue(blankText.getBounds().contains(inside),
                    "Blank text still uses default bounds; interior point should be contained");
        }
    }

    // -----------------------------------------------------------------------
    // SCollection — bounds = union of children bounds
    // -----------------------------------------------------------------------

    @Nested
    class SCollectionContainsPoint {

        // Two non-overlapping children:
        //   rect1: (10, 10, 50, 50)  →  covers x∈[10,60), y∈[10,60)
        //   rect2: (100, 100, 40, 40) →  covers x∈[100,140), y∈[100,140)
        // Union bounds: (10, 10, 130, 130) →  exclusive corner: (140, 140)
        private final SRectangle child1 = SRectangle.create(10, 10, 50, 50);
        private final SRectangle child2 = SRectangle.create(100, 100, 40, 40);
        private final SCollection collection = SCollection.of(child1, child2);

        @Test
        void pointInsideFirstChildBoundsShouldBeContained() {
            Point insideChild1 = new Point(30, 30);
            assertTrue(collection.getBounds().contains(insideChild1),
                    "A point inside the first child's bounds is within the union and should be contained");
        }

        @Test
        void pointInsideSecondChildBoundsShouldBeContained() {
            Point insideChild2 = new Point(120, 120);
            assertTrue(collection.getBounds().contains(insideChild2),
                    "A point inside the second child's bounds is within the union and should be contained");
        }

        @Test
        void pointInGapBetweenChildrenShouldBeContained() {
            // The union rectangle spans the gap between the two children
            Point inGap = new Point(70, 70);
            assertTrue(collection.getBounds().contains(inGap),
                    "A point in the gap between children is still inside the union bounds and should be contained");
        }

        @Test
        void pointOutsideUnionShouldNotBeContained() {
            Point outside = new Point(0, 0);
            assertFalse(collection.getBounds().contains(outside),
                    "A point outside the union bounds should not be contained");
        }

        @Test
        void topLeftCornerOfUnionShouldBeContained() {
            // Union top-left = (10, 10) — inclusive
            Point topLeft = new Point(10, 10);
            assertTrue(collection.getBounds().contains(topLeft),
                    "The top-left corner of the union bounds (inclusive) should be contained");
        }

        @Test
        void bottomRightCornerOfUnionShouldNotBeContained() {
            // Union: x=10, y=10, w=130, h=130 → exclusive corner (140, 140)
            Point bottomRight = new Point(140, 140);
            assertFalse(collection.getBounds().contains(bottomRight),
                    "The bottom-right corner of the union bounds (exclusive) should not be contained");
        }

        @Test
        void pointAfterTranslatingChildrenShouldBeAtNewPosition() {
            SRectangle movableChild = SRectangle.create(0, 0, 30, 30);
            SCollection movable = SCollection.of(movableChild);

            movable.translate(50, 50); // child now at (50, 50, 30, 30)

            Point oldPoint = new Point(15, 15);
            assertFalse(movable.getBounds().contains(oldPoint),
                    "After translate, a point at the old location should not be contained");

            Point newPoint = new Point(65, 65);
            assertTrue(movable.getBounds().contains(newPoint),
                    "After translate, a point at the new location should be contained");
        }

        @Test
        void singleChildCollectionBoundsMatchChildBounds() {
            SRectangle only = SRectangle.create(5, 5, 20, 20);
            SCollection single = SCollection.of(only);

            assertEquals(only.getBounds(), single.getBounds(),
                    "A single-child collection's bounds should equal the child's own bounds");
        }
    }
}