class Story {

    constructor(title, creator) {
        this.title = title;
        this.creator = creator;
        this._comments = [];
        this._likes = [];
        this._counter = 1;
    }

    get likes() {
        if (this._likes.length === 0) {
            return `${this.title} has 0 likes`;
        } else if (this._likes.length === 1) {
            return `${this._likes[0]} likes this story!`;
        } else {
            return `${this._likes[0]} and ${this._likes.length - 1} others like this story!`;
        }
    }

    like(username) {
        if (this._likes.includes(username)) {
            throw new Error('You can\'t like the same story twice!');
        } else if (username === this.creator) {
            throw new Error('You can\'t like your own story!');
        } else {
            this._likes.push(username);
            return `${username} liked ${this.title}!`;
        }
    }

    dislike(username) {
        if (!this._likes.includes(username)) {
            throw new Error('You can\'t dislike this story!')
        } else {
            let theIndex = this._likes.indexOf(username);
            this._likes.splice(theIndex, 1);
            return `${username} disliked ${this.title}`;
        }
    }

    comment(username, content, id) {

        let temp = this._comments.find(e => e.id === id);

        if (temp === undefined || id === undefined) {
            let newTemp = {
                id: this._counter,
                username: username,
                content: content,
                replies: []
            }
            this._comments.push(newTemp);
            this._counter++;
            return `${username} commented on ${this.title}`;

        } else {

            let replayNumber = temp.replies.length + 1;
            let replayObject = {
                id: `${id}.${replayNumber}`,
                username: username,
                content: content
            }
            temp.replies.push(replayObject);
            return `You replied successfully`;
        }
    }

    toString(sortingType) {

        let sb = [];

        let temp = `Title: ${this.title}`;
        sb.push(temp);

        temp = `Creator: ${this.creator}`;
        sb.push(temp);

        temp = `Likes: ${this._likes.length}`;
        sb.push(temp);

        sb.push('Comments:');

        // sortinng
        if (sortingType === 'asc') {
            this._comments.sort((a, b) => a.id - b.id);
            for (let i = 0; i < this._comments.length; i++){
                this._comments[i].replies.sort((a, b) => a.id - b.id);
            }
        } else if (sortingType === 'desc') {
            this._comments.sort((a, b) => (b.id) - (a.id));
            for (let i = 0; i < this._comments.length; i++){
                this._comments[i].replies.sort((a, b) => (b.id) - (a.id));
            }
        } else if (sortingType === 'username') {
            this._comments.sort((a, b) => a.username.localeCompare(b.username));
            for (let i = 0; i < this._comments.length; i++){
                this._comments[i].replies.sort((a, b) => a.username.localeCompare(b.username));
            }
        }

        // sb.appendLine()
        this._comments.forEach(e => {
            temp = `-- ${e.id}. ${e.username}: ${e.content}`;
            sb.push(temp);

            e.replies.forEach(i => {
                temp = `--- ${i.id}. ${i.username}: ${i.content}`;
                sb.push(temp);
            });
        });

        return sb.join('\n');
    }
}