// ── Custom dialog system ──

import { $ } from './util.js';

const overlay = $('dialog');
const titleEl = $('dialog-title');
const msgEl = $('dialog-msg');
const inputEl = $('dialog-input');
const datepickerEl = $('dialog-datepicker');
const cancelBtn = $('dialog-cancel');
const okBtn = $('dialog-ok');
const closeBtn = $('dialog-close');
let resolve = null;
let dpMode = false;
let dpYear, dpMonth, dpSelected;

const DAYS = ['Mo', 'Tu', 'We', 'Th', 'Fr', 'Sa', 'Su'];
const MONTHS = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'];

function canCancel() { return !cancelBtn.classList.contains('hidden'); }

function close(result) {
    overlay.classList.remove('open');
    datepickerEl.classList.add('hidden');
    datepickerEl.innerHTML = '';
    dpMode = false;
    if (resolve) { resolve(result); resolve = null; }
}

function submit() {
    if (dpMode) {
        close(dpSelected || null);
    } else {
        close(inputEl.classList.contains('hidden') ? true : inputEl.value);
    }
}

function pad(n) { return String(n).padStart(2, '0'); }

function renderDatepicker() {
    const today = new Date();
    const todayStr = `${today.getFullYear()}-${pad(today.getMonth() + 1)}-${pad(today.getDate())}`;
    const firstDay = new Date(dpYear, dpMonth, 1).getDay();
    const startOffset = (firstDay + 6) % 7;
    const daysInMonth = new Date(dpYear, dpMonth + 1, 0).getDate();
    const prevDays = new Date(dpYear, dpMonth, 0).getDate();

    let html = `<div class="dp-header">
        <button data-dp-nav="-1"><i class="ph ph-caret-left text-xs"></i></button>
        <span class="dp-title">${MONTHS[dpMonth]} ${dpYear}</span>
        <button data-dp-nav="1"><i class="ph ph-caret-right text-xs"></i></button>
    </div><div class="dp-grid">`;

    for (const d of DAYS) html += `<div class="dp-day-label">${d}</div>`;

    for (let i = 0; i < 42; i++) {
        const dayNum = i - startOffset + 1;
        let ds, display, outClass = '';
        if (dayNum < 1) {
            display = prevDays + dayNum;
            const pm = dpMonth === 0 ? 11 : dpMonth - 1;
            const py = dpMonth === 0 ? dpYear - 1 : dpYear;
            ds = `${py}-${pad(pm + 1)}-${pad(display)}`;
            outClass = 'dp-out';
        } else if (dayNum > daysInMonth) {
            display = dayNum - daysInMonth;
            const nm = dpMonth === 11 ? 0 : dpMonth + 1;
            const ny = dpMonth === 11 ? dpYear + 1 : dpYear;
            ds = `${ny}-${pad(nm + 1)}-${pad(display)}`;
            outClass = 'dp-out';
        } else {
            display = dayNum;
            ds = `${dpYear}-${pad(dpMonth + 1)}-${pad(dayNum)}`;
        }
        const isToday = ds === todayStr ? 'dp-today' : '';
        const isSel = ds === dpSelected ? 'dp-selected' : '';
        html += `<div class="dp-day ${outClass} ${isToday} ${isSel}" data-dp-date="${ds}">${display}</div>`;
    }

    html += '</div>';
    datepickerEl.innerHTML = html;

    // Nav buttons
    datepickerEl.querySelectorAll('[data-dp-nav]').forEach(btn => {
        btn.addEventListener('click', e => {
            e.preventDefault();
            dpMonth += parseInt(btn.dataset.dpNav);
            if (dpMonth > 11) { dpMonth = 0; dpYear++; }
            if (dpMonth < 0) { dpMonth = 11; dpYear--; }
            renderDatepicker();
        });
    });

    // Day click
    datepickerEl.querySelectorAll('[data-dp-date]').forEach(day => {
        day.addEventListener('click', () => {
            dpSelected = day.dataset.dpDate;
            // Parse selected date to navigate to its month
            const [y, m] = dpSelected.split('-').map(Number);
            if (y !== dpYear || m - 1 !== dpMonth) {
                dpYear = y;
                dpMonth = m - 1;
            }
            renderDatepicker();
        });
        day.addEventListener('dblclick', () => {
            dpSelected = day.dataset.dpDate;
            submit();
        });
    });
}

export function showDialog({ title, message = '', input = false, placeholder = '', defaultValue = '', danger = false, okLabel = 'Ok', cancelLabel = 'Cancel' }) {
    return new Promise(res => {
        resolve = res;
        titleEl.textContent = title;
        msgEl.textContent = message;
        msgEl.classList.toggle('hidden', !message);
        dpMode = input === 'date';

        if (dpMode) {
            inputEl.classList.add('hidden');
            datepickerEl.classList.remove('hidden');
            const d = defaultValue ? new Date(defaultValue + 'T00:00:00') : new Date();
            dpYear = d.getFullYear();
            dpMonth = d.getMonth();
            dpSelected = defaultValue || `${d.getFullYear()}-${pad(d.getMonth() + 1)}-${pad(d.getDate())}`;
            renderDatepicker();
        } else {
            datepickerEl.classList.add('hidden');
            datepickerEl.innerHTML = '';
            inputEl.classList.toggle('hidden', input === false);
            inputEl.value = defaultValue;
            inputEl.placeholder = placeholder;
            inputEl.type = input === 'password' ? 'password' : 'text';
        }

        okBtn.textContent = okLabel;
        okBtn.classList.toggle('border-t-danger', danger);
        okBtn.classList.toggle('text-t-danger', danger);
        okBtn.classList.toggle('border-t-accent', !danger);
        okBtn.classList.toggle('text-t-accent', !danger);
        cancelBtn.textContent = cancelLabel;
        cancelBtn.classList.toggle('hidden', !cancelLabel);
        if (closeBtn) closeBtn.classList.toggle('hidden', !cancelLabel);
        overlay.classList.add('open');
        if (input && !dpMode) inputEl.focus(); else okBtn.focus();
    });
}

export function isDialogOpen() { return overlay.classList.contains('open'); }

// Expose to plugins via the hyprcrd API
if (typeof window !== 'undefined' && window.hyprcrd?.dialog) {
    window.hyprcrd.dialog.show = showDialog;
}

okBtn.addEventListener('click', submit);
cancelBtn.addEventListener('click', () => { if (canCancel()) close(null); });
if (closeBtn) closeBtn.addEventListener('click', () => { if (canCancel()) close(null); });
overlay.addEventListener('click', e => { if (e.target === overlay && canCancel()) close(null); });
overlay.addEventListener('keydown', e => {
    if (e.key === 'Escape' && canCancel()) close(null);
    if (e.key === 'Enter') submit();
});