import { describe, it, expect, vi } from 'vitest';
import { renderHook, act } from '@testing-library/react';
import { useTool } from './useTool';
import { FloorplanState, FloorplanAction } from '../state/types';
import { initialState } from '../state/reducer';

const withBrush = (action: FloorplanState['brush']['action'], h = 0): FloorplanState =>
    ({ ...initialState, brush: { h, action } });

const mockProjection = (tile: { row: number; col: number } | null) => ({
    fromClient: () => tile
});

describe('useTool', () =>
{
    it('SET dispatches PAINT_TILE on pointer down at hit tile', () =>
    {
        const dispatch = vi.fn();
        const { result } = renderHook(() => useTool(withBrush('SET', 3), dispatch as React.Dispatch<FloorplanAction>, mockProjection({ row: 1, col: 2 })));
        act(() => result.current.onPointerDown({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        expect(dispatch).toHaveBeenCalledWith({ type: 'PAINT_TILE', row: 1, col: 2, h: 3, source: 'local' });
    });

    it('UNSET dispatches ERASE_TILE', () =>
    {
        const dispatch = vi.fn();
        const { result } = renderHook(() => useTool(withBrush('UNSET'), dispatch as React.Dispatch<FloorplanAction>, mockProjection({ row: 0, col: 0 })));
        act(() => result.current.onPointerDown({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        expect(dispatch).toHaveBeenCalledWith({ type: 'ERASE_TILE', row: 0, col: 0, source: 'local' });
    });

    it('UP dispatches ADJUST_HEIGHT delta=+1', () =>
    {
        const dispatch = vi.fn();
        const { result } = renderHook(() => useTool(withBrush('UP'), dispatch as React.Dispatch<FloorplanAction>, mockProjection({ row: 5, col: 6 })));
        act(() => result.current.onPointerDown({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        expect(dispatch).toHaveBeenCalledWith({ type: 'ADJUST_HEIGHT', row: 5, col: 6, delta: 1, source: 'local' });
    });

    it('DOWN dispatches ADJUST_HEIGHT delta=-1', () =>
    {
        const dispatch = vi.fn();
        const { result } = renderHook(() => useTool(withBrush('DOWN'), dispatch as React.Dispatch<FloorplanAction>, mockProjection({ row: 1, col: 1 })));
        act(() => result.current.onPointerDown({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        expect(dispatch).toHaveBeenCalledWith({ type: 'ADJUST_HEIGHT', row: 1, col: 1, delta: -1, source: 'local' });
    });

    it('DOOR dispatches SET_DOOR with row→y, col→x', () =>
    {
        const dispatch = vi.fn();
        const { result } = renderHook(() => useTool(withBrush('DOOR'), dispatch as React.Dispatch<FloorplanAction>, mockProjection({ row: 4, col: 7 })));
        act(() => result.current.onPointerDown({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        expect(dispatch).toHaveBeenCalledWith({ type: 'SET_DOOR', x: 7, y: 4, source: 'local' });
    });

    it('does nothing when projection returns null', () =>
    {
        const dispatch = vi.fn();
        const { result } = renderHook(() => useTool(withBrush('SET'), dispatch as React.Dispatch<FloorplanAction>, mockProjection(null)));
        act(() => result.current.onPointerDown({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        expect(dispatch).not.toHaveBeenCalled();
    });

    it('PAINT continues on pointer move when dragging', () =>
    {
        const dispatch = vi.fn();
        let projTile: { row: number; col: number } = { row: 0, col: 0 };
        const projection = { fromClient: () => projTile };
        const { result } = renderHook(() => useTool(withBrush('SET', 0), dispatch as React.Dispatch<FloorplanAction>, projection));
        act(() => result.current.onPointerDown({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        dispatch.mockClear();
        projTile = { row: 0, col: 1 };
        act(() => result.current.onPointerMove({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        expect(dispatch).toHaveBeenCalledWith({ type: 'PAINT_TILE', row: 0, col: 1, h: 0, source: 'local' });
    });

    it('PAINT does not re-dispatch on move within same tile', () =>
    {
        const dispatch = vi.fn();
        const projection = { fromClient: () => ({ row: 0, col: 0 }) };
        const { result } = renderHook(() => useTool(withBrush('SET'), dispatch as React.Dispatch<FloorplanAction>, projection));
        act(() => result.current.onPointerDown({ clientX: 0, clientY: 0, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        dispatch.mockClear();
        act(() => result.current.onPointerMove({ clientX: 1, clientY: 1, pointerId: 1, currentTarget: { setPointerCapture: () => {} } } as never));
        expect(dispatch).not.toHaveBeenCalled();
    });
});