/**
 * assets/js/setup.js
 * Setup form interactivity: conditional field visibility + form submission.
 */

(function () {
    'use strict';

    const form         = document.getElementById('session-form');
    const occasionSel  = document.getElementById('occasion');
    const photoInput   = document.getElementById('photo');
    const uploadStatus = document.getElementById('upload-status');
    const submitBtn    = document.getElementById('submit-btn');
    const msgBox       = document.getElementById('form-message');
    const nameHelp     = document.getElementById('name-help');

    // Are we editing an existing session?
    const isEditMode = !!form.querySelector('[name="id"]');

    // Fields to show/hide by occasion (field IDs without the "field-" prefix)
    const OCCASION_FIELDS = {
        novena_deceased:    ['novena_day', 'novena_mystery_mode', 'subject_name', 'subject_pronoun', 'subject_dates'],
        divine_mercy_novena:['novena_day'],
        memorial:           ['subject_name', 'subject_pronoun', 'subject_dates'],
        general_rosary:     [],
    };

    const mysteryStandardWrap = document.getElementById('field-mystery_set_standard');

    function toggleFields() {
        const occasion       = occasionSel.value;
        const show           = OCCASION_FIELDS[occasion] || [];
        const isNovenaDeceased  = (occasion === 'novena_deceased');
        const isDivineMercy     = (occasion === 'divine_mercy_novena');
        const isAnyNovena       = isNovenaDeceased || isDivineMercy;

        // Standard mystery dropdown: hide for both novena types
        if (mysteryStandardWrap) {
            mysteryStandardWrap.style.display = isAnyNovena ? 'none' : '';
            const sel = document.getElementById('mystery_set');
            if (sel) {
                if (isAnyNovena) {
                    sel.removeAttribute('required');
                    if (!sel.value) sel.value = 'sorrowful';
                } else {
                    sel.setAttribute('required', '');
                }
            }
        }

        // Show/hide conditional fields
        document.querySelectorAll('.conditional-field').forEach(el => {
            const fieldName = el.id.replace('field-', '');
            // novena_mystery_mode only shows for novena_deceased, not divine_mercy_novena
            if (fieldName === 'novena_mystery_mode' && !isNovenaDeceased) {
                el.style.display = 'none';
                el.querySelectorAll('input, select').forEach(input => input.removeAttribute('required'));
                return;
            }
            const visible = show.includes(fieldName);
            el.style.display = visible ? '' : 'none';
            el.querySelectorAll('input, select').forEach(input => {
                if (!visible) input.removeAttribute('required');
            });
        });

        // Update submit button label
        if (submitBtn) {
            if (isNovenaDeceased) {
                submitBtn.textContent = submitBtn.dataset.labelNovenaDeceased;
            } else if (isDivineMercy) {
                submitBtn.textContent = submitBtn.dataset.labelDivineMercy;
            } else {
                submitBtn.textContent = submitBtn.dataset.labelDefault;
            }
        }

        // Update session name help text
        if (nameHelp) {
            nameHelp.style.display = isAnyNovena && !isEditMode ? '' : 'none';
        }
    }

    occasionSel.addEventListener('change', toggleFields);
    toggleFields(); // run on page load (handles edit mode pre-selection)

    // ------------------------------------------------------------------
    // Photo upload on file selection
    // ------------------------------------------------------------------
    var photoUploading = false;

    if (photoInput) {
        photoInput.addEventListener('change', async function () {
            if (!this.files || !this.files[0]) return;

            const file = this.files[0];
            uploadStatus.style.display = '';
            uploadStatus.className     = 'upload-status uploading';
            uploadStatus.textContent   = 'Uploading\u2026';

            // Disable submit while upload is in progress
            photoUploading = true;
            if (submitBtn) submitBtn.disabled = true;

            const fd = new FormData();
            fd.append('photo', file);

            try {
                const res  = await fetch(BASE_URL + '/api/upload_photo.php', { method: 'POST', body: fd });
                const data = await res.json();

                if (data.error) {
                    uploadStatus.className   = 'upload-status error';
                    uploadStatus.textContent = 'Upload failed: ' + data.error;
                } else {
                    document.getElementById('photo_path').value = data.path;
                    // Clear the file input so the file is not re-sent with the main form
                    photoInput.value = '';
                    uploadStatus.className   = 'upload-status success';
                    uploadStatus.textContent = 'Photo uploaded successfully.';
                }
            } catch (err) {
                uploadStatus.className   = 'upload-status error';
                uploadStatus.textContent = 'Network error during upload.';
            } finally {
                photoUploading = false;
                if (submitBtn) submitBtn.disabled = false;
            }
        });
    }

    // ------------------------------------------------------------------
    // Form submission via fetch
    // ------------------------------------------------------------------
    form.addEventListener('submit', async function (e) {
        e.preventDefault();

        if (!form.checkValidity()) {
            form.reportValidity();
            return;
        }

        submitBtn.disabled    = true;
        submitBtn.textContent = 'Saving\u2026';
        showMessage('', '');

        const fd = new FormData(form);

        try {
            const res  = await fetch(BASE_URL + '/api/save_session.php', { method: 'POST', body: fd });
            const data = await res.json();

            if (data.error) {
                showMessage('error', data.error);
                submitBtn.disabled = false;
                const occ = occasionSel.value;
                submitBtn.textContent = isEditMode
                    ? submitBtn.dataset.labelDefault
                    : (occ === 'novena_deceased'    ? submitBtn.dataset.labelNovenaDeceased
                    :  occ === 'divine_mercy_novena' ? submitBtn.dataset.labelDivineMercy
                    :                                  submitBtn.dataset.labelDefault);
            } else if (data.novena) {
                // All 9 days created — go to admin dashboard
                window.location.href = BASE_URL + '/admin/?novena_created=' + data.ids.length;
            } else {
                // Single session — go to presentation
                window.location.href = BASE_URL + '/present.php?id=' + data.id;
            }
        } catch (err) {
            showMessage('error', 'Network error. Please try again.');
            submitBtn.disabled    = false;
            submitBtn.textContent = submitBtn.dataset.labelDefault;
        }
    });

    function showMessage(type, text) {
        if (!text) {
            msgBox.style.display = 'none';
            return;
        }
        msgBox.style.display = '';
        msgBox.className     = 'alert alert-' + type;
        msgBox.textContent   = text;
    }

})();