//const url = 'mqtt://tplinkwifi.net';
let client;

window.addEventListener('DOMContentLoaded', (event) => {
    const tabs = document.querySelector('#tabs');
    tabs.addEventListener('change', (event) => {
        if (event.target.type != 'radio') {
            return;
        }

        switchTab();
    });

    const buttonSubmit = document.querySelector('#connection-submit');
    buttonSubmit.addEventListener('click', (event) => {
        if (client) {
            client.end();
        }
        const broker = document.querySelector('#connection-broker').value;
        const topic = document.querySelector('#connection-topic').value;
        connect(broker, topic);
        buttonSubmit.classList.add('is-loading');
    });

    // start
    document.querySelector('#connection-broker').value = 'test.mosquitto.org:8081';
    document.querySelector('#connection-topic').value = 'test/2';
    document.querySelector('#connection-submit').click();

});

function createChart(data) {
    const elm = document.querySelector('#chart');
    while (elm.childElementCount > 0) {
        elm.firstElementChild.remove();
    }

    const ctx = document.createElement('canvas');
    elm.appendChild(ctx);

    // generate labels
    const labels = [];
    for (i = 1; i <= data.length; i++) {
        labels.push(i);
    }

    const gridColor = '#4f4f4f';
    new Chart(ctx, {
        type: 'line',
        data: {
            labels: labels,
            datasets: [{
                data: data,
                borderColor: '#d1fff8'
            }]
        },
        options: {
            scales: {
                x: {
                    grid: {
                        color: gridColor
                    },
                    ticks: {
                        color: gridColor
                    }
                },
                y: {
                    grid: {
                        color: gridColor
                    },
                    ticks: {
                        color: gridColor
                    }
                }
            },
            plugins: {
                legend: {
                    display: false
                }
            }
        }
    });
}

function loadValues(data) {
    let elm = document.querySelector('#values');

    while (elm.childElementCount > 0) {
        elm.firstElementChild.remove();
    }

    for (let i = 0; i < data.length; i++) {
        const val = document.createElement('span');
        val.innerText = data[i];
        val.classList.add('is-align-self-center');

        const cell = document.createElement('div');
        cell.classList.add('cell', 'tag', 'has-background-dark');
        cell.appendChild(val);

        elm.appendChild(cell);
    }
}

function switchTab() {
    const buttons = tabs.querySelectorAll('input[type="radio"]');
    const block = document.querySelector('#block');

    for (let i = 0; i < buttons.length; i++) {
        const name = buttons[i].getAttribute('data-tab');
        const container = block.querySelector(`.container[data-tab="${name}"]`);
        if (buttons[i].checked) {
            container.style.setProperty('display', 'block');
        } else {
            container.style.setProperty('display', 'none');
        }
    }
}

function connect(broker, topic) {
    client = mqtt.connect('wss://' + broker);
    const options = { retain: false, qos: 1 };
    const submitButton = document.querySelector('#connection-submit');

    client.on('connect', () => {
        if (client.connected) {
            toast('connected');
            submitButton.classList.remove('is-loading');
        }
    });

    client.on('close', () => {
        console.log('close');
        toast('connection closed');
        submitButton.classList.remove('is-loading');
    });

    client.on('error', (err) => {
        console.error(err);
        toast('error');
        submitButton.classList.remove('is-loading');
    });

    client.on('message', (topic, message) => {
        console.log(message);
        toast('message received');
        submitButton.classList.remove('is-loading');
        const tab = document.querySelector('#chart-tab');
        tab.checked = true;
        switchTab();
        createChart(message);
        loadValues(message);
    });
    client.subscribe(topic, options);
}

function toast(message) {
    const duration = 3;
    const elm = document.createElement('p');
    elm.innerText = message;
    elm.classList.add('toast');
    document.querySelector('#toaster').appendChild(elm);

    elm.style.setProperty('--duration', duration + 's');
    setTimeout(() => {
        elm.remove();
    }, duration * 1000);
}