const scheduleDOM = document.getElementById('schedule');

const VERSION = "v1.0.0";

const days = [
    'monday', 'tuesday', 'wednesday', 'thursday',
    'friday', 'saturday', 'sunday',
];

let schedule = {
    version: VERSION,
    days: {},
};

const offlineTitle = 'OFFLINE';
const offlineSubtitle = 'takin a nap';
let copyClipboard;
let saveImage;

document.addEventListener('readystatechange', () => {
    document.getElementById('version').innerText = VERSION;

    loadSchedule();
    createSchedule();

    document.getElementById('import').addEventListener('click', () => {
        importJSON();
    });
    document.getElementById('save').addEventListener('click', () => {
        saveSchedule();
    });
    document.getElementById('alt-text').addEventListener('click', () => {
        altText();
    });
    document.getElementById('clipboard').addEventListener('click', () => {
        copyClipboard();
    });
    document.getElementById('save-image').addEventListener('click', () => {
        saveImage();
    });
    document.getElementById('export').addEventListener('click', () => {
        exportJSON();
    });
});

function importJSON() {
    const filePicker = document.createElement('input');
    filePicker.type = 'file';
    filePicker.accept = 'application/json';
    filePicker.addEventListener('input', () => {
        if (filePicker.files.length == 0) return;
        const file = filePicker.files[0];
        file.text().then(text => {
            try {
                schedule = JSON.parse(text);

                for (const day in schedule.days) {
                    const data = schedule.days[day];
                    const slot = document.getElementById(`slot-${day}`);
                    if (!data.enabled) {
                        slot.classList.add('disabled');
                        slot.querySelector('.timeslot-title').innerText = offlineTitle
                        slot.querySelector('.timeslot-subtitle').innerText = offlineSubtitle
                        continue;
                    }

                    slot.classList.remove('disabled');
                    slot.querySelector('.timeslot-time').innerText = data.time
                    slot.querySelector('.timeslot-title').innerText = data.title
                    slot.querySelector('.timeslot-subtitle').innerText = data.subtitle
                }
            } catch (err) {
                console.error(err);
                alert('Failed to import schedule. Check the browser console for details.');
            }
        }).catch(err => {
            console.error(err);
            alert('Failed to import schedule. Check the browser console for details.');
        });
    });
    filePicker.click();
}

function saveSchedule() {
    localStorage.setItem('streamschedule', btoa(JSON.stringify(schedule)));
}

function loadSchedule() {
    const saved = localStorage.getItem('streamschedule');
    if (!saved) return;
    schedule = JSON.parse(atob(saved));
}

function altText() {
    let altText = "ari melody LIVE schedule: ";

    const activeDays = Object.keys(schedule.days)
        .filter(day => schedule.days[day].enabled)
        .reduce((days, day) => (days[day] = schedule.days[day], days), {});
    const nDays = Object.keys(activeDays).length;
    for (let i = 0; i < nDays; i++) {
        const day = Object.keys(activeDays)[i];
        const slot = schedule.days[day];
        if (!slot.enabled) continue;

        if (i == nDays - 1)
            altText += `and `;
        altText += slot.title;
        if (slot.subtitle.length > 0)
            altText += ` (${slot.subtitle})`;
        altText += ` on ${day} @ ${slot.time}`;
        if (i < nDays - 1)
            altText += `, `;
    }

    alert(altText);
}

if ('webkit' in window && 'messageHandlers' in window.webkit) {
  let _promiseId = 0;
  let _promises = new Map();

  window.addEventListener('message', (event) => {
    const [id] = event.detail;
    const [resolve,] = _promises.get(id) ?? [];
    if (!resolve) return;
    _promises.delete(id);
    resolve();
  });

  window.addEventListener('message', (event) => {
    const [id] = event.detail;
    const [,reject] = _promises.get(id) ?? [];
    if (!reject) return;
    _promises.delete(id);
    reject();
  });

  copyClipboard = () => new Promise((resolve, reject) => {
    const thisPromiseId = ++_promiseId;

    _promises.set(thisPromiseId, [resolve, reject]);

    const schedule = document.getElementById('schedule');
    const boundingRect = schedule.getBoundingClientRect();

    window.webkit.messageHandlers.copySnapshot.postMessage([
      thisPromiseId,
      'clipboard',
      boundingRect.x + 1,
      boundingRect.y + 1,
      boundingRect.width - 2,
      boundingRect.height - 2,
    ]);
  });

  saveImage = () => new Promise((resolve, reject) => {
    const thisPromiseId = ++_promiseId;

    _promises.set(thisPromiseId, [resolve, reject]);

    const schedule = document.getElementById('schedule');
    const boundingRect = schedule.getBoundingClientRect();

    window.webkit.messageHandlers.copySnapshot.postMessage([
      thisPromiseId,
      'file',
      boundingRect.x + 1,
      boundingRect.y + 1,
      boundingRect.width - 2,
      boundingRect.height - 2,
    ]);
  });

  document.getElementById('clipboard').removeAttribute('disabled');
  document.getElementById('save-image').removeAttribute('disabled');
}

function exportJSON() {
    const json = JSON.stringify(schedule, null, '\t');
    const data = new Blob([json], {
        type: 'application/json',
    });
    const link = document.createElement('a');
    link.href = URL.createObjectURL(data);
    link.download = 'stream-schedule.json';
    link.click();
}

function createSchedule() {
    for (let i = 0; i < days.length; i++) {
        const day = days[i];

        if (schedule.days[day] == undefined) schedule.days[day] = {
            enabled: false,
            time: '6pm UTC',
            title: 'Untitled Event',
            subtitle: "yep, that sure is an event if i've ever seen one",
        };

        const container = document.createElement('div');
        container.className = 'timeslot';
        container.id = `slot-${day}`;
        if (!schedule.days[day].enabled)
            container.classList.add('disabled');

        const timeslotDateContainer = document.createElement('div');
        timeslotDateContainer.className = 'timeslot-date';
        const timeslotDay = document.createElement('div');
        timeslotDay.className = 'timeslot-day';
        timeslotDay.innerText = day.substring(0, 3).toUpperCase();
        timeslotDateContainer.appendChild(timeslotDay);
        const timeslotTime = document.createElement('div');
        timeslotTime.className = 'timeslot-time';
        timeslotTime.innerText = schedule.days[day].time;
        timeslotTime.contentEditable = true;
        timeslotDateContainer.appendChild(timeslotTime);
        container.appendChild(timeslotDateContainer);

        const timeslotContentContainer = document.createElement('div');
        timeslotContentContainer.className = 'timeslot-content';
        const timeslotTitle = document.createElement('div');
        timeslotTitle.className = 'timeslot-title';
        timeslotTitle.innerText = schedule.days[day].enabled ?
            schedule.days[day].title : offlineTitle;
        timeslotTitle.contentEditable = schedule.days[day].enabled;
        timeslotTitle.spellcheck = false;
        timeslotContentContainer.appendChild(timeslotTitle);
        const timeslotSubtitle = document.createElement('div');
        timeslotSubtitle.className = 'timeslot-subtitle';
        timeslotSubtitle.innerText = schedule.days[day].enabled ?
            schedule.days[day].subtitle : offlineSubtitle;
        timeslotSubtitle.contentEditable = schedule.days[day].enabled;
        timeslotSubtitle.spellcheck = false;
        timeslotContentContainer.appendChild(timeslotSubtitle);
        container.appendChild(timeslotContentContainer);

        scheduleDOM.appendChild(container);

        timeslotDay.addEventListener('click', () => {
            schedule.days[day].enabled = !schedule.days[day].enabled;

            timeslotTitle.contentEditable = schedule.days[day].enabled;
            timeslotSubtitle.contentEditable = schedule.days[day].enabled;

            if (schedule.days[day].enabled) {
                container.classList.remove('disabled');
                timeslotTitle.innerText = schedule.days[day].title;
                timeslotSubtitle.innerText = schedule.days[day].subtitle;
            } else {
                container.classList.add('disabled');
                timeslotTitle.innerText = offlineTitle;
                timeslotSubtitle.innerText = offlineSubtitle;
            }
        });
        timeslotTitle.addEventListener('keyup', () => {
            schedule.days[day].title = timeslotTitle.innerText;
        });
        timeslotSubtitle.addEventListener('keyup', () => {
            if (timeslotSubtitle.innerHTML.includes('<br>'))
                timeslotSubtitle.innerText = '';
            schedule.days[day].subtitle = timeslotSubtitle.innerText;
        });
        timeslotTime.addEventListener('keyup', () => {
            schedule.days[day].time = timeslotTime.innerText;
        });
    }
}