// This file is part of Moodle - http://moodle.org/
//
// Moodle is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Moodle is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Moodle.  If not, see <http://www.gnu.org/licenses/>.

/**
 * @module     mod_meetletacbfree/settings_registration
 * @copyright  2026 MeetLet <info@meetlet.net>
 * @license    http://www.gnu.org/copyleft/gpl.html GNU GPL v3 or later
 */

define(['core/ajax', 'mod_meetletacbfree/meetlet_modal_scroll'], function(Ajax, MeetletModalScroll) {
    'use strict';

function byId(id) {
        return document.getElementById(id);
    }

    function setFlash(el, ok, message) {
        if (!el) {
            return;
        }
        el.className = 'alert mt-3 ' + (ok ? 'alert-success' : 'alert-danger');
        el.textContent = message || '';
        el.classList.toggle('d-none', !message);
    }

    function setActiveUi(active) {
        var inactive = byId('meetlet-registration-actions-inactive');
        var activeEl = byId('meetlet-registration-actions-active');
        var product = byId('meetlet-registration-product');
        if (inactive) {
            inactive.classList.toggle('d-none', !!active);
        }
        if (activeEl) {
            activeEl.classList.toggle('d-none', !active);
        }
        if (product) {
            product.classList.toggle('d-none', !active);
        }
    }

    function renderSummary(summary) {
        if (!summary) {
            return;
        }
        var badge = byId('meetlet-registration-status-badge');
        var cfg = byId('meetlet-registration-config');
        if (badge) {
            badge.className = 'badge meetlet-license-badge '
                + (summary.active ? 'meetlet-license-badge--active' : 'meetlet-license-badge--inactive');
            badge.textContent = summary.status_label
                || (summary.active
                    ? (cfg && cfg.dataset.labelActive) || 'Active'
                    : (cfg && cfg.dataset.labelInactive) || 'Inactive');
        }
        var domain = byId('meetlet-registration-domain');
        if (domain && cfg && cfg.dataset.labelDomain) {
            domain.textContent = cfg.dataset.labelDomain.replace('__V__', summary.domain || '—');
        }
        var installation = byId('meetlet-registration-installation');
        if (installation && cfg && cfg.dataset.labelInstallation) {
            installation.textContent = cfg.dataset.labelInstallation.replace('__V__', summary.installation_id || '—');
        }
        var product = byId('meetlet-registration-product');
        if (product) {
            product.textContent = summary.product_label || '';
        }
        var err = byId('meetlet-registration-error');
        if (err) {
            if (summary.error) {
                err.textContent = summary.error;
                err.classList.remove('d-none');
            } else {
                err.textContent = '';
                err.classList.add('d-none');
            }
        }
        setActiveUi(!!summary.active);
    }

    function currentApiUrl(cfg) {
        var input = cfg && cfg.dataset.apiInput ? document.getElementById(cfg.dataset.apiInput) : null;
        if (input && input.value) {
            return input.value.trim();
        }
        return '';
    }

    var modalState = {
        open: false,
        resolve: null,
        lastFocus: null,
        onKey: null,
    };

    function ensureModalOnBody(modal) {
        if (modal && modal.parentNode !== document.body) {
            document.body.appendChild(modal);
        }
        return modal;
    }

    function modalScroll() {
        return MeetletModalScroll;
    }

    function closeRegistrationModal(result) {
        var modal = byId('meetlet-registration-modal');
        if (!modal) {
            return;
        }
        modal.setAttribute('hidden', 'hidden');
        modal.style.display = 'none';
        modalScroll().unlock();
        if (modalState.onKey) {
            document.removeEventListener('keydown', modalState.onKey, true);
            modalState.onKey = null;
        }
        modalState.open = false;
        var resolve = modalState.resolve;
        modalState.resolve = null;
        if (modalState.lastFocus) {
            modalScroll().focusNoScroll(modalState.lastFocus);
        }
        modalState.lastFocus = null;
        if (typeof resolve === 'function') {
            resolve(!!result);
        }
    }

    function openRegistrationModal(opts) {
        var modal = ensureModalOnBody(byId('meetlet-registration-modal'));
        var cfg = byId('meetlet-registration-config');
        if (!modal) {
            return Promise.resolve(false);
        }
        if (modalState.open) {
            closeRegistrationModal(false);
        }

        var title = byId('meetlet-registration-modal-title');
        var body = byId('meetlet-registration-modal-body');
        var confirmBtn = byId('meetlet-registration-modal-confirm');
        var tpl = opts.templateId ? document.getElementById(opts.templateId) : null;
        if (!title || !body || !confirmBtn) {
            return Promise.resolve(false);
        }

        title.textContent = opts.title || '';
        if (tpl) {
            body.innerHTML = '';
            if (tpl.content && tpl.content.cloneNode) {
                body.appendChild(tpl.content.cloneNode(true));
            } else {
                body.innerHTML = tpl.innerHTML;
            }
        } else {
            body.innerHTML = '';
        }
        confirmBtn.textContent = opts.confirmLabel || '';
        confirmBtn.className = 'btn ' + (opts.danger ? 'btn-outline-danger' : 'btn-primary');

        modalState.lastFocus = document.activeElement;
        modalScroll().lock();
        modal.removeAttribute('hidden');
        modal.style.display = 'flex';
        modalState.open = true;

        modalState.onKey = function (e) {
            if (!modalState.open) {
                return;
            }
            if (e.key === 'Escape') {
                e.preventDefault();
                e.stopPropagation();
                closeRegistrationModal(false);
                return;
            }
            if (e.key !== 'Tab') {
                return;
            }
            var focusable = modal.querySelectorAll(
                'button:not([disabled]), [href], input, select, textarea, [tabindex]:not([tabindex="-1"])'
            );
            if (!focusable.length) {
                return;
            }
            var first = focusable[0];
            var last = focusable[focusable.length - 1];
            if (e.shiftKey && document.activeElement === first) {
                e.preventDefault();
                modalScroll().focusNoScroll(last);
            } else if (!e.shiftKey && document.activeElement === last) {
                e.preventDefault();
                modalScroll().focusNoScroll(first);
            }
        };
        document.addEventListener('keydown', modalState.onKey, true);

        window.setTimeout(function () {
            modalScroll().focusNoScroll(confirmBtn);
        }, 20);

        return new Promise(function (resolve) {
            modalState.resolve = resolve;
        });
    }

    function postAction(action) {
        var cfg = byId('meetlet-registration-config');
        var flash = byId('meetlet-registration-flash');
        if (!cfg) {
            return;
        }
        setFlash(flash, true, '…');
        Ajax.call([{
            methodname: 'mod_meetletacbfree_registration_action',
            args: {
                action: action,
                registration_api_url: currentApiUrl(cfg)
            }
        }])[0].then(function(data) {
            data.summary = {
                active: !!data.active,
                status: data.status,
                status_label: data.status_label,
                product_label: data.product_label,
                domain: data.domain,
                installation_id: data.installation_id,
                can_deactivate: !!data.can_deactivate
            };
            if (data.summary) {
                renderSummary(data.summary);
            }
            if (data.success) {
                setFlash(flash, true, data.message);
                if (action === 'activate' || action === 'deactivate') {
                    window.setTimeout(function() {
                        window.location.reload();
                    }, 600);
                }
            } else {
                setFlash(flash, false, data.error || 'Request failed');
            }
        }).catch(function(err) {
            setFlash(flash, false, err && err.message ? err.message : 'Request failed');
        });
    }

    function bindModalChrome() {
        var modal = byId('meetlet-registration-modal');
        if (!modal || modal.dataset.bound === '1') {
            return;
        }
        modal.dataset.bound = '1';
        modal.addEventListener('click', function (e) {
            if (e.target.closest('[data-meetlet-modal-dismiss]')) {
                e.preventDefault();
                closeRegistrationModal(false);
            }
        });
        var confirmBtn = byId('meetlet-registration-modal-confirm');
        if (confirmBtn) {
            confirmBtn.addEventListener('click', function (e) {
                e.preventDefault();
                closeRegistrationModal(true);
            });
        }
    }

    function bindDeactivateButton(btn) {
        if (!btn || btn.dataset.bound === '1') {
            return;
        }
        var cfg = byId('meetlet-registration-config');
        btn.dataset.bound = '1';
        btn.addEventListener('click', function () {
            openRegistrationModal({
                title: (cfg && cfg.dataset.confirmDeactivateTitle) || '',
                templateId: 'meetlet-registration-tpl-deactivate',
                confirmLabel: (cfg && cfg.dataset.confirmDeactivateOk) || '',
                danger: true,
            }).then(function (ok) {
                if (ok) {
                    postAction('deactivate');
                }
            });
        });
    }

    function bind() {
        var activate = byId('meetlet-registration-activate');
        var recheck = byId('meetlet-registration-recheck');
        var deactivate = byId('meetlet-registration-deactivate');
        var cfg = byId('meetlet-registration-config');
        if ((!activate && !recheck) || (activate && activate.dataset.bound === '1')) {
            return;
        }
        bindModalChrome();
        if (activate) {
            activate.dataset.bound = '1';
            activate.addEventListener('click', function () {
                openRegistrationModal({
                    title: (cfg && cfg.dataset.confirmActivateTitle) || '',
                    templateId: 'meetlet-registration-tpl-activate',
                    confirmLabel: (cfg && cfg.dataset.confirmActivateOk) || '',
                    danger: false,
                }).then(function (ok) {
                    if (ok) {
                        postAction('activate');
                    }
                });
            });
        }
        if (recheck) {
            recheck.dataset.bound = '1';
            recheck.addEventListener('click', function () {
                postAction('recheck');
            });
        }
        bindDeactivateButton(deactivate);
    }

    return {init: bind};
});