class BoardDescription {
    constructor(
        board,
        title,
        subtitle,
        image_limit
    ) {
        this.board = board; // i.e. 'rf'
        this.title = title; // i.e. 'Убежище'
        this.subtitle = subtitle; // i.e. 'Доска с ОП-модерацией'
        this.image_limit = image_limit; // i.e. 4
    }
}

class ThreadDescription {
    constructor(
        no,
        sub,
        com,
        name
    ) {
        this.no = no; // i.e. 55977
        this.title = sub; // Thread title
        this.message = com; // Thread OP message
        this.op_name = name; // i.e. 'Доброанон'
    }
}

class VichanApiClient {
    constructor(base_url) {
        this.base_url = base_url; // i.e. 'https://rf.dobrochan.net/vichan'
    }

    boards() {
        return fetch(`${this.base_url}/boards.json`)
            .then((response) => response.json())
            .then((data) => {
                const result = [];
                for (const board of data) {
                    result.push(
                        new BoardDescription(
                            board.board,
                            board.title,
                            board.subtitle,
                            board.image_limit
                        )
                    )
                }
                return result;
            })
    }

    page(board, page = 0) {
        return fetch(`${this.base_url}/${board}/${page}.json`)
            .then((response) => response.json())
            .then((data) => {
                const result = [];
                for (const thread of data.threads) {
                    result.push(
                        new ThreadDescription(
                            thread.posts[0].no,
                            thread.posts[0].sub,
                            thread.posts[0].com,
                            thread.posts[0].name,
                        )
                    )
                }
                return result;
            })
    }
}

class DobrochanConsolePrinter {
    print(title, data) {
        console.log(title);
        for (const item of data) {
            for (const field in item) {
                console.log(`${field}: ${item[field]}`);
            }
        }
    }
}

class DobrochanClient {
    constructor(
        base_url = 'https://rf.dobrochan.net/vichan'
    ) {
        this.api_client = new VichanApiClient(base_url);
        this.boards = this.api_client.boards();
    }

    get_boards() {
        return this.boards;
    }

    get_first_page(board) {
        return this.api_client.page(board, 0);
    }
}

async function main() {
    const printer = new DobrochanConsolePrinter();
    const dc = new DobrochanClient();
    printer.print(`Доски`, await dc.get_boards());
    printer.print(`Нулевая /b`, await dc.get_first_page('b'));
}

main();