import * as React from 'react';

const useSelectionState = (keys, initialValue)=>{
    const [selections, setSelections] = React.useState(initialValue);
    const selectOne = (selection)=>{
        const index = selections.findIndex((currentSelection)=>keys.every((key)=>currentSelection[key] === selection[key]));
        if (index > -1) {
            setSelections((prevSelected)=>[
                    ...prevSelected.slice(0, index),
                    ...prevSelected.slice(index + 1)
                ]);
        } else {
            setSelections((prevSelected)=>[
                    ...prevSelected,
                    selection
                ]);
        }
    };
    const selectAll = (nextSelections)=>{
        if (selections.length > 0) {
            setSelections([]);
        } else {
            setSelections(nextSelections);
        }
    };
    const selectOnly = (nextSelection)=>{
        const index = selections.findIndex((currentSelection)=>keys.every((key)=>currentSelection[key] === nextSelection[key]));
        if (index > -1) {
            setSelections([]);
        } else {
            setSelections([
                nextSelection
            ]);
        }
    };
    const selectMultiple = (nextSelections)=>{
        setSelections((currSelections)=>[
                // already selected items
                ...currSelections,
                // filter out already selected items from nextSelections
                ...nextSelections.filter((nextSelection)=>currSelections.findIndex((currentSelection)=>keys.every((key)=>currentSelection[key] === nextSelection[key])) === -1)
            ]);
    };
    const deselectMultiple = (nextSelections)=>{
        setSelections((currSelections)=>[
                // filter out items in currSelections that are in nextSelections
                ...currSelections.filter((currentSelection)=>nextSelections.findIndex((nextSelection)=>keys.every((key)=>currentSelection[key] === nextSelection[key])) === -1)
            ]);
    };
    return [
        selections,
        {
            selectOne,
            selectAll,
            selectOnly,
            selectMultiple,
            deselectMultiple,
            setSelections
        }
    ];
};

export { useSelectionState };
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