/* WooDoo Frontend JS – Calendar Booking */
( function () {
    'use strict';

    const cfg = window.WooDooCalendar;
    if ( ! cfg ) return;  // not on calendar page

    const i18n     = cfg.i18n;
    const ajaxUrl  = cfg.ajax_url;
    const nonce    = cfg.nonce;

    // ── Element refs ────────────────────────────────────────────────────
    const dateInput     = document.getElementById( 'woodoo-booking-date' );
    const slotsWrap     = document.getElementById( 'woodoo-slots-wrap' );
    const slotsGrid     = document.getElementById( 'woodoo-slots-grid' );
    const confirmBlock  = document.getElementById( 'woodoo-booking-confirm' );
    const bookBtn       = document.getElementById( 'woodoo-book-btn' );
    const notesArea     = document.getElementById( 'woodoo-booking-notes' );
    const slotLabel     = document.getElementById( 'woodoo-selected-slot-label' );
    const successMsg    = document.getElementById( 'woodoo-booking-success' );
    const errorMsg      = document.getElementById( 'woodoo-booking-error' );

    let selectedStart = null;
    let selectedEnd   = null;

    // ── Date change → load slots ────────────────────────────────────────
    if ( dateInput ) {
        dateInput.addEventListener( 'change', function () {
            const date = this.value;
            if ( ! date ) return;

            slotsGrid.innerHTML = '<em>' + esc( i18n.loading ) + '</em>';
            slotsWrap.style.display = 'block';
            confirmBlock.style.display = 'none';
            successMsg.style.display = 'none';
            errorMsg.style.display   = 'none';
            selectedStart = selectedEnd = null;
            bookBtn.disabled = true;

            post( 'woodoo_get_slots', { date } )
                .then( res => {
                    if ( ! res.success ) {
                        slotsGrid.innerHTML = '<em>' + esc( i18n.error ) + '</em>';
                        return;
                    }

                    const slots = res.data;
                    if ( ! slots.length ) {
                        slotsGrid.innerHTML = '<em>' + esc( i18n.no_slots ) + '</em>';
                        confirmBlock.style.display = 'none';
                        return;
                    }

                    slotsGrid.innerHTML = '';
                    slots.forEach( slot => {
                        const btn = document.createElement( 'button' );
                        btn.type       = 'button';
                        btn.className  = 'woodoo-slot';
                        btn.textContent = formatTime( slot.start ) + ' – ' + formatTime( slot.end );
                        btn.dataset.start = slot.start;
                        btn.dataset.end   = slot.end;
                        btn.addEventListener( 'click', onSlotClick );
                        slotsGrid.appendChild( btn );
                    } );
                } )
                .catch( () => {
                    slotsGrid.innerHTML = '<em>' + esc( i18n.error ) + '</em>';
                } );
        } );
    }

    // ── Slot selection ───────────────────────────────────────────────────
    function onSlotClick( e ) {
        document.querySelectorAll( '.woodoo-slot' )
            .forEach( b => b.classList.remove( 'selected' ) );

        const btn = e.currentTarget;
        btn.classList.add( 'selected' );

        selectedStart = btn.dataset.start;
        selectedEnd   = btn.dataset.end;

        slotLabel.textContent =
            new Date( selectedStart ).toLocaleDateString( undefined, {
                weekday: 'long', year: 'numeric', month: 'long', day: 'numeric',
            } ) + ' ' + formatTime( selectedStart ) + ' – ' + formatTime( selectedEnd );

        confirmBlock.style.display = 'block';
        bookBtn.disabled = false;
        successMsg.style.display = 'none';
        errorMsg.style.display   = 'none';
    }

    // ── Confirm booking ──────────────────────────────────────────────────
    if ( bookBtn ) {
        bookBtn.addEventListener( 'click', function () {
            if ( ! selectedStart || ! selectedEnd ) return;

            bookBtn.disabled = true;
            bookBtn.textContent = i18n.booking;
            errorMsg.style.display = 'none';

            post( 'woodoo_book_slot', {
                start : selectedStart,
                end   : selectedEnd,
                notes : notesArea ? notesArea.value : '',
            } )
            .then( res => {
                if ( res.success ) {
                    successMsg.textContent  = res.data.message;
                    successMsg.style.display = 'block';
                    confirmBlock.style.display = 'none';
                    slotsWrap.style.display  = 'none';
                    dateInput.value          = '';
                    selectedStart = selectedEnd = null;

                    // Re-fetch meetings after booking
                    refreshMeetings();
                } else {
                    showError( res.data || i18n.error );
                    bookBtn.disabled = false;
                    bookBtn.textContent = i18n.book_btn;
                }
            } )
            .catch( () => {
                showError( i18n.error );
                bookBtn.disabled = false;
                bookBtn.textContent = i18n.book_btn;
            } );
        } );
    }

    // ── Cancel meeting ───────────────────────────────────────────────────
    document.querySelectorAll( '.woodoo-cancel-meeting' ).forEach( btn => {
        btn.addEventListener( 'click', function () {
            if ( ! confirm( i18n.cancel_confirm ) ) return;

            const eventId = this.dataset.eventId;
            const card    = this.closest( '.woodoo-meeting-card' );

            this.disabled = true;
            this.textContent = i18n.cancelling;

            post( 'woodoo_cancel_meeting', { event_id: eventId } )
                .then( res => {
                    if ( res.success ) {
                        card.style.opacity = '0.4';
                        card.style.transition = 'opacity .3s';
                        setTimeout( () => card.remove(), 350 );
                    } else {
                        alert( res.data || i18n.error );
                        this.disabled = false;
                        this.textContent = 'Cancel';
                    }
                } )
                .catch( () => {
                    this.disabled = false;
                    this.textContent = 'Cancel';
                } );
        } );
    } );

    // ── Refresh meetings list ────────────────────────────────────────────
    function refreshMeetings() {
        const listEl = document.getElementById( 'woodoo-meetings-list' );
        if ( ! listEl ) return;

        post( 'woodoo_get_meetings', {} )
            .then( res => {
                if ( ! res.success ) return;
                const meetings = res.data;
                if ( ! meetings.length ) {
                    listEl.innerHTML = '<p class="woodoo-empty">' + esc( 'No upcoming meetings scheduled.' ) + '</p>';
                    return;
                }

                let html = '<div class="woodoo-meetings-grid">';
                meetings.forEach( ev => {
                    const start = new Date( ev.start.replace( ' ', 'T' ) );
                    const end   = new Date( ev.stop.replace(  ' ', 'T' ) );
                    html +=
                        '<div class="woodoo-meeting-card" data-event-id="' + ev.id + '">' +
                            '<div class="woodoo-meeting-card__date">' +
                                '<span class="woodoo-meeting-card__day">'   + pad( start.getDate() )     + '</span>' +
                                '<span class="woodoo-meeting-card__month">' + monthShort( start )         + '</span>' +
                            '</div>' +
                            '<div class="woodoo-meeting-card__info">' +
                                '<strong>' + esc( ev.name ) + '</strong>' +
                                '<span class="woodoo-meeting-card__time">' +
                                    timeStr( start ) + ' – ' + timeStr( end ) +
                                '</span>' +
                                ( ev.videocall_location
                                    ? '<a href="' + esc( ev.videocall_location ) + '" target="_blank" rel="noopener" class="woodoo-meeting-card__video">Join Video Call</a>'
                                    : '' ) +
                            '</div>' +
                            '<div class="woodoo-meeting-card__actions">' +
                                '<button class="woodoo-cancel-meeting woodoo-btn woodoo-btn--sm woodoo-btn--outline" data-event-id="' + ev.id + '">Cancel</button>' +
                            '</div>' +
                        '</div>';
                } );
                html += '</div>';
                listEl.innerHTML = html;

                // Re-bind cancel buttons
                listEl.querySelectorAll( '.woodoo-cancel-meeting' ).forEach( btn => {
                    btn.addEventListener( 'click', function () {
                        // same handler as above – re-use via custom event trick
                        btn.dispatchEvent( new Event( 'woodoo:cancel' ) );
                    } );
                } );
            } );
    }

    // ── Helpers ──────────────────────────────────────────────────────────
    function post( action, data ) {
        const body = new URLSearchParams( Object.assign( { action, nonce }, data ) );
        return fetch( ajaxUrl, { method: 'POST', body } )
            .then( r => r.json() );
    }

    function formatTime( datetimeStr ) {
        return datetimeStr.slice( 11, 16 );
    }

    function timeStr( d ) {
        return pad( d.getHours() ) + ':' + pad( d.getMinutes() );
    }

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

    function monthShort( d ) {
        return d.toLocaleDateString( undefined, { month: 'short' } );
    }

    function esc( str ) {
        return String( str )
            .replace( /&/g, '&amp;' )
            .replace( /</g, '&lt;'  )
            .replace( />/g, '&gt;'  )
            .replace( /"/g, '&quot;' );
    }

    function showError( msg ) {
        errorMsg.textContent  = msg;
        errorMsg.style.display = 'block';
    }

} )();