import { applyChange, revertChange } from 'deep-diff';
import ListWalker from './ListWalker';
import type { Redux } from '../messages';

export default class ReduxStateManager extends ListWalker<Redux> {
	private state: Object = {}
	private finalStates: Object[] = []

	moveWasUpdated(time, index) {
		super.moveApply(
			time,
			this.onIncrement,
			this.onDecrement,
		)
	}

	onIncrement = (item) => {
		this.processRedux(item, true);
	}

	onDecrement = (item) => {
		this.processRedux(item, false);
	}

	private processRedux(action, forward) {
		if (forward) {
			if (!!action.state) {
				this.finalStates.push(this.state);
				this.state = JSON.parse(JSON.stringify(action.state)); // Deep clone :(
			} else {
        action.diff.forEach(d => {
        	try { 
        		applyChange(this.state, d);
        	} catch (e) { 
        		//console.warn("Deepdiff error")
        	}
        });
			}
		} else {
			if (!!action.state) {
				this.state = this.finalStates.pop();
			} else {
				action.diff.forEach(d => {
					try { 
        		revertChange(this.state, 1, d); // bad lib :( TODO: write our own diff
        	} catch (e) {
        		//console.warn("Deepdiff error")
        	}
        });
			}
		}
	}
}