iswhoa/public/scripts/controllers/gamestate.js

const GAME_STATE_KEY = "gameState";
const MAX_QUESTIONS = 10;

class GameState {
    getQuestionChoice(qId) {
        let savedItem = this._readGameState();
        if (qId in savedItem) {
            return savedItem[qId];
        }
        return null;
    }

    setQuestionChoice(qId, cId, isRight) {
        let savedItem = this._readGameState();
        savedItem[qId] = {cId: cId, isRight: isRight};
        localStorage.setItem(GAME_STATE_KEY, JSON.stringify(savedItem));
    }

    clearChoices() {
        localStorage.removeItem(GAME_STATE_KEY);
    }

    getMaxQuestions() {
        return MAX_QUESTIONS;
    }

    getSummary() {
        let savedItem = this._readGameState();
        let summary = { totalAnswered: 0, totalRight: 0 };

        for (let k in savedItem) {
            summary.totalAnswered++;
            if (savedItem[k].isRight) {
                summary.totalRight++;
            }
        }

        if (summary.totalAnswered != MAX_QUESTIONS) {
            summary.rank = "Incompletionist";
        } else if (summary.totalRight <= 2) {
            summary.rank = "Developer";
        } else if (summary.totalRight <= 5) {
            summary.rank = "Senior Developer";
        } else if (summary.totalRight <= 7) {
            summary.rank = "Standard Enthusiast";
        } else if (summary.totalRight <= 9) {
            summary.rank = "Standard Maker";
        } else if (summary.totalRight == 10) {
            summary.rank = "ISO President";
        } else {
            summary.rank = "Beta Tester";
        }

        return summary;
    }

    _readGameState() {
        let savedItem = localStorage.getItem(GAME_STATE_KEY);
        if (savedItem === null) {
            return {};
        } else {
            return JSON.parse(savedItem);
        }
    }
}

export let gameState = new GameState();