import * as React from 'react';
import { useDrop, useDrag } from 'react-dnd';
import { useKeyboardDragAndDrop } from './useKeyboardDragAndDrop.mjs';

const DIRECTIONS = {
    UPWARD: 'upward',
    DOWNWARD: 'downward'
};
const DROP_SENSITIVITY = {
    REGULAR: 'regular',
    IMMEDIATE: 'immediate'
};
/**
 * A utility hook abstracting the general drag and drop hooks from react-dnd.
 * Centralising the same behaviours and by default offering keyboard support.
 */ const useDragAndDrop = (active, { type = 'STRAPI_DND', index, item, onStart, onEnd, onGrabItem, onDropItem, onCancel, onMoveItem, dropSensitivity = DROP_SENSITIVITY.REGULAR })=>{
    const objectRef = React.useRef(null);
    const [{ handlerId, isOver }, dropRef] = useDrop({
        accept: type,
        collect (monitor) {
            return {
                handlerId: monitor.getHandlerId(),
                isOver: monitor.isOver({
                    shallow: true
                })
            };
        },
        drop (item) {
            const draggedIndex = item.index;
            const newIndex = index;
            if (isOver && onDropItem) {
                onDropItem(draggedIndex, newIndex);
            }
        },
        hover (item, monitor) {
            if (!objectRef.current || !onMoveItem) {
                return;
            }
            const dragIndex = item.index;
            const newIndex = index;
            const hoverBoundingRect = objectRef.current?.getBoundingClientRect();
            const hoverMiddleY = (hoverBoundingRect.bottom - hoverBoundingRect.top) / 2;
            const clientOffset = monitor.getClientOffset();
            if (!clientOffset) return;
            const hoverClientY = clientOffset && clientOffset.y - hoverBoundingRect.top;
            if (typeof dragIndex === 'number' && typeof newIndex === 'number') {
                if (dragIndex === newIndex) {
                    // Don't replace items with themselves
                    return;
                }
                if (dropSensitivity === DROP_SENSITIVITY.REGULAR) {
                    // Dragging downwards
                    if (dragIndex < newIndex && hoverClientY < hoverMiddleY) {
                        return;
                    }
                    // Dragging upwards
                    if (dragIndex > newIndex && hoverClientY > hoverMiddleY) {
                        return;
                    }
                }
                // Time to actually perform the action
                onMoveItem(newIndex, dragIndex);
                item.index = newIndex;
            } else {
                // Using numbers as indices doesn't work for nested list items with path like [1, 1, 0]
                if (Array.isArray(dragIndex) && Array.isArray(newIndex)) {
                    // Indices comparison to find item position in nested list
                    const minLength = Math.min(dragIndex.length, newIndex.length);
                    let areEqual = true;
                    let isLessThan = false;
                    let isGreaterThan = false;
                    for(let i = 0; i < minLength; i++){
                        if (dragIndex[i] < newIndex[i]) {
                            isLessThan = true;
                            areEqual = false;
                            break;
                        } else if (dragIndex[i] > newIndex[i]) {
                            isGreaterThan = true;
                            areEqual = false;
                            break;
                        }
                    }
                    // Don't replace items with themselves
                    if (areEqual && dragIndex.length === newIndex.length) {
                        return;
                    }
                    if (dropSensitivity === DROP_SENSITIVITY.REGULAR) {
                        // Dragging downwards
                        if (isLessThan && !isGreaterThan && hoverClientY < hoverMiddleY) {
                            return;
                        }
                        // Dragging upwards
                        if (isGreaterThan && !isLessThan && hoverClientY > hoverMiddleY) {
                            return;
                        }
                    }
                }
                onMoveItem(newIndex, dragIndex);
                item.index = newIndex;
            }
        }
    });
    const getDragDirection = (monitor)=>{
        if (monitor && monitor.isDragging() && !monitor.didDrop() && monitor.getInitialClientOffset() && monitor.getClientOffset()) {
            const deltaY = monitor.getInitialClientOffset().y - monitor.getClientOffset().y;
            if (deltaY > 0) return DIRECTIONS.UPWARD;
            if (deltaY < 0) return DIRECTIONS.DOWNWARD;
            return null;
        }
        return null;
    };
    const [{ isDragging, direction }, dragRef, dragPreviewRef] = useDrag({
        type,
        item () {
            if (onStart) {
                onStart();
            }
            /**
       * This will be attached and it helps define the preview sizes
       * when a component is flexy e.g. Relations
       */ const { width } = objectRef.current?.getBoundingClientRect() ?? {};
            return {
                index,
                width,
                ...item
            };
        },
        end () {
            if (onEnd) {
                onEnd();
            }
        },
        canDrag: active,
        /**
     * This is useful when the item is in a virtualized list.
     * However, if we don't have an ID then we want the libraries
     * defaults to take care of this.
     */ isDragging: item?.id ? (monitor)=>{
            return item.id === monitor.getItem().id;
        } : undefined,
        collect: (monitor)=>({
                isDragging: monitor.isDragging(),
                initialOffset: monitor.getInitialClientOffset(),
                currentOffset: monitor.getClientOffset(),
                direction: getDragDirection(monitor)
            })
    });
    const handleKeyDown = useKeyboardDragAndDrop(active, index, {
        onGrabItem,
        onDropItem,
        onCancel,
        onMoveItem
    });
    return [
        {
            handlerId,
            isDragging,
            handleKeyDown,
            isOverDropTarget: isOver,
            direction
        },
        objectRef,
        dropRef,
        dragRef,
        dragPreviewRef
    ];
};

export { DIRECTIONS, DROP_SENSITIVITY, useDragAndDrop };
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