import { describe, it, expect, beforeEach } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useCropHandles, type CropBounds } from '@/hooks/useCropHandles';

describe('useCropHandles Hook', () => {
  const imageDimensions = { width: 800, height: 600 };
  const initialCrop: CropBounds = { x: 100, y: 100, width: 200, height: 200 };

  describe('Initialization', () => {
    it('should initialize with null crop when no initialCrop provided', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions })
      );

      expect(result.current.crop).toBeNull();
      expect(result.current.isDragging).toBe(false);
    });

    it('should initialize with provided initialCrop', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      expect(result.current.crop).toEqual(initialCrop);
    });

    it('should enforce minimum size on initialCrop', () => {
      const tinyBounds: CropBounds = { x: 50, y: 50, width: 10, height: 10 };
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop: tinyBounds, minSize: 100 })
      );

      expect(result.current.crop).toEqual({
        x: 50,
        y: 50,
        width: 100,
        height: 100,
      });
    });
  });

  describe('setCrop', () => {
    it('should set crop bounds', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions })
      );

      const newBounds: CropBounds = { x: 50, y: 50, width: 300, height: 300 };

      act(() => {
        result.current.setCrop(newBounds);
      });

      expect(result.current.crop).toEqual(newBounds);
    });

    it('should clear crop with null', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.setCrop(null);
      });

      expect(result.current.crop).toBeNull();
    });

    it('should constrain bounds within image', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions })
      );

      const outOfBounds: CropBounds = { x: 600, y: 400, width: 400, height: 400 };

      act(() => {
        result.current.setCrop(outOfBounds);
      });

      expect(result.current.crop!.x).toBeLessThanOrEqual(imageDimensions.width - result.current.crop!.width);
      expect(result.current.crop!.y).toBeLessThanOrEqual(imageDimensions.height - result.current.crop!.height);
    });

    it('should enforce minimum size', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, minSize: 100 })
      );

      const smallBounds: CropBounds = { x: 50, y: 50, width: 20, height: 20 };

      act(() => {
        result.current.setCrop(smallBounds);
      });

      expect(result.current.crop!.width).toBeGreaterThanOrEqual(100);
      expect(result.current.crop!.height).toBeGreaterThanOrEqual(100);
    });
  });

  describe('resetCrop', () => {
    it('should clear crop bounds', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      expect(result.current.crop).not.toBeNull();

      act(() => {
        result.current.resetCrop();
      });

      expect(result.current.crop).toBeNull();
    });
  });

  describe('Drag Operations - Corner Handles', () => {
    it('should drag top-left corner inward', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('top-left', 100, 100);
      });

      expect(result.current.isDragging).toBe(true);

      act(() => {
        result.current.moveDrag(120, 120);
      });

      expect(result.current.crop!.x).toBe(120);
      expect(result.current.crop!.y).toBe(120);
      expect(result.current.crop!.width).toBe(180);
      expect(result.current.crop!.height).toBe(180);
    });

    it('should drag top-right corner', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('top-right', 300, 100);
      });

      act(() => {
        result.current.moveDrag(350, 130);
      });

      expect(result.current.crop!.x).toBe(100);
      expect(result.current.crop!.y).toBe(130);
      expect(result.current.crop!.width).toBe(250);
      expect(result.current.crop!.height).toBe(170);
    });

    it('should drag bottom-right corner', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('bottom-right', 300, 300);
      });

      act(() => {
        result.current.moveDrag(350, 380);
      });

      expect(result.current.crop!.x).toBe(100);
      expect(result.current.crop!.y).toBe(100);
      expect(result.current.crop!.width).toBe(250);
      expect(result.current.crop!.height).toBe(280);
    });

    it('should drag bottom-left corner', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('bottom-left', 100, 300);
      });

      act(() => {
        result.current.moveDrag(140, 380);
      });

      expect(result.current.crop!.x).toBe(140);
      expect(result.current.crop!.y).toBe(100);
      expect(result.current.crop!.width).toBe(160);
      expect(result.current.crop!.height).toBe(280);
    });
  });

  describe('Drag Operations - Edge Handles', () => {
    it('should drag top edge', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('top', 200, 100);
      });

      act(() => {
        result.current.moveDrag(200, 130);
      });

      expect(result.current.crop!.x).toBe(100);
      expect(result.current.crop!.y).toBe(130);
      expect(result.current.crop!.width).toBe(200);
      expect(result.current.crop!.height).toBe(170);
    });

    it('should drag right edge', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('right', 300, 200);
      });

      act(() => {
        result.current.moveDrag(380, 200);
      });

      expect(result.current.crop!.x).toBe(100);
      expect(result.current.crop!.y).toBe(100);
      expect(result.current.crop!.width).toBe(280);
      expect(result.current.crop!.height).toBe(200);
    });

    it('should drag bottom edge', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('bottom', 200, 300);
      });

      act(() => {
        result.current.moveDrag(200, 380);
      });

      expect(result.current.crop!.x).toBe(100);
      expect(result.current.crop!.y).toBe(100);
      expect(result.current.crop!.width).toBe(200);
      expect(result.current.crop!.height).toBe(280);
    });

    it('should drag left edge', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('left', 100, 200);
      });

      act(() => {
        result.current.moveDrag(140, 200);
      });

      expect(result.current.crop!.x).toBe(140);
      expect(result.current.crop!.y).toBe(100);
      expect(result.current.crop!.width).toBe(160);
      expect(result.current.crop!.height).toBe(200);
    });
  });

  describe('Drag Constraints', () => {
    it('should not allow dragging outside left boundary', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('left', 100, 200);
      });

      act(() => {
        result.current.moveDrag(-100, 200); // Try to drag far left
      });

      expect(result.current.crop!.x).toBeGreaterThanOrEqual(0);
    });

    it('should not allow dragging outside right boundary', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('right', 300, 200);
      });

      act(() => {
        result.current.moveDrag(900, 200); // Try to drag far right
      });

      const { crop } = result.current;
      expect(crop!.x + crop!.width).toBeLessThanOrEqual(imageDimensions.width);
    });

    it('should not allow dragging outside top boundary', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('top', 200, 100);
      });

      act(() => {
        result.current.moveDrag(200, -100); // Try to drag far up
      });

      expect(result.current.crop!.y).toBeGreaterThanOrEqual(0);
    });

    it('should not allow dragging outside bottom boundary', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('bottom', 200, 300);
      });

      act(() => {
        result.current.moveDrag(200, 800); // Try to drag far down
      });

      const { crop } = result.current;
      expect(crop!.y + crop!.height).toBeLessThanOrEqual(imageDimensions.height);
    });

    it('should not allow crop smaller than minSize', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop, minSize: 100 })
      );

      act(() => {
        result.current.startDrag('bottom-right', 300, 300);
      });

      act(() => {
        result.current.moveDrag(180, 180); // Try to make tiny crop
      });

      expect(result.current.crop!.width).toBeGreaterThanOrEqual(100);
      expect(result.current.crop!.height).toBeGreaterThanOrEqual(100);
    });
  });

  describe('Drag End', () => {
    it('should end drag and set isDragging to false', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('top-left', 100, 100);
      });

      expect(result.current.isDragging).toBe(true);

      act(() => {
        result.current.moveDrag(120, 120);
      });

      act(() => {
        result.current.endDrag();
      });

      expect(result.current.isDragging).toBe(false);
    });

    it('should preserve crop bounds after endDrag', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('right', 300, 200);
      });

      act(() => {
        result.current.moveDrag(350, 200);
      });

      const boundsBeforeEnd = { ...result.current.crop! };

      act(() => {
        result.current.endDrag();
      });

      expect(result.current.crop).toEqual(boundsBeforeEnd);
    });
  });

  describe('Edge Cases', () => {
    it('should not crash when dragging without starting', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, initialCrop })
      );

      expect(() => {
        act(() => {
          result.current.moveDrag(150, 150);
        });
      }).not.toThrow();
    });

    it('should handle very large image dimensions', () => {
      const largeDimensions = { width: 10000, height: 8000 };
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions: largeDimensions, initialCrop })
      );

      act(() => {
        result.current.startDrag('bottom-right', 300, 300);
      });

      act(() => {
        result.current.moveDrag(5000, 4000);
      });

      expect(result.current.crop).toBeDefined();
      expect(result.current.crop!.x + result.current.crop!.width).toBeLessThanOrEqual(largeDimensions.width);
    });

    it('should handle custom minimum size', () => {
      const { result } = renderHook(() =>
        useCropHandles({ imageDimensions, minSize: 50 })
      );

      const smallBounds: CropBounds = { x: 10, y: 10, width: 20, height: 20 };

      act(() => {
        result.current.setCrop(smallBounds);
      });

      expect(result.current.crop!.width).toBeGreaterThanOrEqual(50);
      expect(result.current.crop!.height).toBeGreaterThanOrEqual(50);
    });
  });
});