const EventEmitter = require("events");
const Reward = require("./Reward");

class Quest extends EventEmitter {
    constructor(configuration, doneCallback) {
        super();

        this.id = configuration.id;
        this.currentComplete = configuration.completedAmount;
        this.maximumComplete = configuration.maximumComplete;
        this.task = JSON.parse(JSON.stringify(configuration.task)); 
        this.reward = new Reward({ 
            distributionType: 2, 
            baseReward: configuration.reward
        });
        this.name = configuration.name || "Quest without a name";
        this.finishedCount = 0;
        this.totalTasksCount = Object.values(this.task).reduce((pre, cur) => pre + cur.length, 0);
        this.doneCallback = doneCallback;
    }

    adjustTask(events, amount) {
        events.forEach(type => {
            const tasksInCategory = this.task[type.taskCategoryID];
            if (!tasksInCategory) return 

            tasksInCategory.forEach(task => {
                if (task.isFinished) return 

                if (type.typeID === task.typeID && type.entityTypeID === task.entityTypeID) {
                    task.amount += amount;

                    
                    
                    if (task.requiredAmount <= task.amount) {
                        task.amount = task.requiredAmount;
                        task.isFinished = true;
                        this.finishedCount++;

                        
                    };
                };
            });        
        });

        if (this.finishedCount === this.totalTasksCount) {
            
            this.doneCallback(this.id);
        };
    }

    getTasks() {
        const taskTypes = Object.keys(this.task);
        return taskTypes.map(t => this.task[t]);
    }

    getProgression() {
        const taskTypes = Object.keys(this.task);
        const progression = [];
        taskTypes.forEach(t => this.task[t].forEach((c, i) => {
            progression.push({ amount: c.amount, index: i, type: t });
        }));
        
        return progression;
    }
};

module.exports = Quest;