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import { BEGIN_DRAG, PUBLISH_DRAG_SOURCE, HOVER, END_DRAG, DROP, } from '../actions/dragDrop';
import { ADD_SOURCE, ADD_TARGET, REMOVE_SOURCE, REMOVE_TARGET, } from '../actions/registry';
import { areArraysEqual } from '../utils/equality';
import { NONE, ALL } from '../utils/dirtiness';
import { xor } from '../utils/js_utils';
export function reduce(
// eslint-disable-next-line @typescript-eslint/no-unused-vars
_state = NONE, action) {
    switch (action.type) {
        case HOVER:
            break;
        case ADD_SOURCE:
        case ADD_TARGET:
        case REMOVE_TARGET:
        case REMOVE_SOURCE:
            return NONE;
        case BEGIN_DRAG:
        case PUBLISH_DRAG_SOURCE:
        case END_DRAG:
        case DROP:
        default:
            return ALL;
    }
    const { targetIds = [], prevTargetIds = [] } = action.payload;
    const result = xor(targetIds, prevTargetIds);
    const didChange = result.length > 0 || !areArraysEqual(targetIds, prevTargetIds);
    if (!didChange) {
        return NONE;
    }
    // Check the target ids at the innermost position. If they are valid, add them
    // to the result
    const prevInnermostTargetId = prevTargetIds[prevTargetIds.length - 1];
    const innermostTargetId = targetIds[targetIds.length - 1];
    if (prevInnermostTargetId !== innermostTargetId) {
        if (prevInnermostTargetId) {
            result.push(prevInnermostTargetId);
        }
        if (innermostTargetId) {
            result.push(innermostTargetId);
        }
    }
    return result;
}