/**
 * AKSRT modal auth interactions.
 *
 * @package AKSRT
 */

(function () {
    'use strict';

    var API_ROOT = (window.aksrtData && window.aksrtData.apiUrl) || '/wp-json/aksrt/v1';
    var NONCE = (window.aksrtData && window.aksrtData.restNonce) || '';

    var modal = null;
    var currentTab = 'login';

    function init() {
        modal = document.getElementById('aksrt-modal-auth');
        if (!modal) {
            return;
        }

        var closeBtn = modal.querySelector('.aksrt-modal-auth__close');
        var overlay = modal.querySelector('.aksrt-modal-auth__overlay');
        if (closeBtn) {
            closeBtn.addEventListener('click', close);
        }
        if (overlay) {
            overlay.addEventListener('click', close);
        }

        document.addEventListener('keydown', function (event) {
            if (event.key === 'Escape' && modal.classList.contains('is-open')) {
                close();
            }
        });

        modal.querySelectorAll('.aksrt-modal-auth__tab').forEach(function (tab) {
            tab.addEventListener('click', function () {
                switchTab(this.dataset.tab || 'login');
            });
        });

        modal.querySelectorAll('.aksrt-modal-auth__switch').forEach(function (button) {
            button.addEventListener('click', function () {
                switchTab(this.dataset.switch || 'login');
            });
        });

        modal.querySelectorAll('.aksrt-modal-auth__pass-toggle').forEach(function (button) {
            button.addEventListener('click', function () {
                var input = this.parentElement.querySelector('input');
                var icon = this.querySelector('i');
                if (!input || !icon) {
                    return;
                }

                if (input.type === 'password') {
                    input.type = 'text';
                    icon.className = 'far fa-eye-slash';
                } else {
                    input.type = 'password';
                    icon.className = 'far fa-eye';
                }
            });
        });

        var loginForm = document.getElementById('aksrt-modal-login-form');
        if (loginForm) {
            loginForm.addEventListener('submit', function (event) {
                event.preventDefault();
                handleLogin(loginForm);
            });
        }

        var registerForm = document.getElementById('aksrt-modal-register-form');
        if (registerForm) {
            registerForm.addEventListener('submit', function (event) {
                event.preventDefault();
                handleRegister(registerForm);
            });
        }

        document.addEventListener('click', function (event) {
            var trigger = event.target.closest('[data-aksrt-auth-required], .aksrt-login-trigger, #nav-login-btn, .signin-loader, .signup-loader, .qrcode-signin');
            if (!trigger) {
                return;
            }

            event.preventDefault();

            if (trigger.classList.contains('signup-loader')) {
                open(trigger.dataset.authRedirect || '');
                switchTab('register');
                return;
            }
            if (trigger.classList.contains('qrcode-signin')) {
                open(trigger.dataset.authRedirect || '');
                switchTab('qrcode');
                return;
            }

            open(trigger.dataset.authRedirect || '');
        });

        initQrLogin();
        initAgreementShake();
        initSocialPriority();
    }

    function open(redirectUrl) {
        if (!modal) {
            return;
        }

        modal.classList.add('is-open');
        modal.setAttribute('aria-hidden', 'false');
        document.body.style.overflow = 'hidden';

        if (redirectUrl) {
            modal.dataset.redirect = redirectUrl;
        }

        setTimeout(function () {
            var firstInput = modal.querySelector('.aksrt-modal-auth__panel.is-active input:not([type="hidden"])');
            if (firstInput) {
                firstInput.focus();
            }
        }, 100);
    }

    var qrLoginTimer = null;

    function close() {
        if (!modal) {
            return;
        }

        modal.classList.remove('is-open');
        modal.setAttribute('aria-hidden', 'true');
        document.body.style.overflow = '';
        clearMessages();
        stopQrPolling();
    }

    function switchTab(tab) {
        currentTab = tab;

        modal.querySelectorAll('.aksrt-modal-auth__tab').forEach(function (button) {
            var isActive = button.dataset.tab === tab;
            button.classList.toggle('is-active', isActive);
            button.setAttribute('aria-selected', isActive ? 'true' : 'false');
        });

        modal.querySelectorAll('.aksrt-modal-auth__panel').forEach(function (panel) {
            panel.classList.toggle('is-active', panel.dataset.panel === tab);
        });

        modal.querySelectorAll('.aksrt-modal-auth__footer-text').forEach(function (row) {
            row.hidden = row.dataset.for !== tab;
        });

        modal.setAttribute('aria-label', tab === 'register' ? '注册' : '登录');
        clearMessages();
    }

    function withCaptcha(scene, form, next) {
        var store = window.AKSRTCaptchaState && window.AKSRTCaptchaState.scenes
            ? window.AKSRTCaptchaState.scenes
            : null;
        var instance = store && store[scene] ? store[scene] : null;
        if (instance && typeof instance.verify === 'function') {
            instance.verify(function () {
                next(serializeForm(form));
            });
            return;
        }
        next(serializeForm(form));
    }

    function resetCaptcha(scene) {
        try {
            var store = window.AKSRTCaptchaState && window.AKSRTCaptchaState.scenes
                ? window.AKSRTCaptchaState.scenes
                : null;
            if (store && store[scene] && typeof store[scene].reset === 'function') {
                store[scene].reset();
            }
        } catch (e) { /* ignore */ }
    }

    function handleLogin(form) {
        if (!form.querySelector('[name="log"]') || !form.querySelector('[name="pwd"]')) {
            showMessage('login', '请输入用户名和密码', 'error');
            return;
        }

        setLoading(form, true);
        clearMessages();

        withCaptcha('login', form, function (payload) {
            if (!payload.log || !payload.pwd) {
                setLoading(form, false);
                showMessage('login', '请输入用户名和密码', 'error');
                return;
            }

            request('/auth/modal-login', payload)
                .then(function (result) {
                    if (result.ok && result.data.success) {
                        onAuthSuccess(result.data);
                        return;
                    }

                    resetCaptcha('login');
                    var message = result.data.message || '登录失败';
                    if (result.data.verify_url) {
                        message += ' <a href="' + escapeAttribute(result.data.verify_url) + '">前往验证</a>';
                    }
                    showMessage('login', message, 'error');
                })
                .catch(function () {
                    resetCaptcha('login');
                    showMessage('login', '网络错误，请稍后重试', 'error');
                })
                .finally(function () {
                    setLoading(form, false);
                });
        });
    }

    function handleRegister(form) {
        setLoading(form, true);
        clearMessages();

        withCaptcha('register', form, function (payload) {
            if (!payload.user_login || !payload.user_email || !payload.user_pass || !payload.user_pass_confirm) {
                setLoading(form, false);
                showMessage('register', '请完整填写注册信息', 'error');
                return;
            }

            if (payload.user_pass !== payload.user_pass_confirm) {
                setLoading(form, false);
                showMessage('register', '两次输入的密码不一致', 'error');
                return;
            }

            request('/auth/modal-register', payload)
                .then(function (result) {
                    if (!result.ok || !result.data.success) {
                        resetCaptcha('register');
                        showMessage('register', result.data.message || '注册失败', 'error');
                        return;
                    }

                    if (result.data.user) {
                        onAuthSuccess(result.data);
                        return;
                    }

                    if (result.data.verification_required) {
                        var verifyMessage = result.data.message || '注册成功，请完成邮箱验证';
                        if (result.data.verify_url) {
                            verifyMessage += ' <a href="' + escapeAttribute(result.data.verify_url) + '">前往验证</a>';
                        }
                        showMessage('register', verifyMessage, 'success');
                        form.reset();
                        resetCaptcha('register');
                        return;
                    }

                    var loginMessage = result.data.message || '注册成功，请登录';
                    switchTab('login');
                    prefillLogin(result.data.user_login || result.data.user_email || '');
                    showMessage('login', loginMessage, 'success');
                    form.reset();
                    resetCaptcha('register');
                })
                .catch(function () {
                    resetCaptcha('register');
                    showMessage('register', '网络错误，请稍后重试', 'error');
                })
                .finally(function () {
                    setLoading(form, false);
                });
        });
    }

    function serializeForm(form) {
        var payload = {};
        var formData = new FormData(form);

        formData.forEach(function (value, key) {
            if (payload[key] !== undefined) {
                if (!Array.isArray(payload[key])) {
                    payload[key] = [payload[key]];
                }
                payload[key].push(value);
            } else {
                payload[key] = value;
            }
        });

        return payload;
    }

    function request(path, payload) {
        var headers = { 'Content-Type': 'application/json' };
        if (NONCE) {
            headers['X-WP-Nonce'] = NONCE;
        }

        return fetch(API_ROOT + path, {
            method: 'POST',
            headers: headers,
            body: JSON.stringify(payload),
        }).then(function (response) {
            return response.json().then(function (data) {
                return { ok: response.ok, data: data };
            });
        });
    }

    function prefillLogin(value) {
        var loginInput = document.getElementById('modal-login-user');
        if (loginInput && value) {
            loginInput.value = value;
        }
    }

    function onAuthSuccess(data) {
        close();

        if (data.user) {
            updateNavUser(data.user);
        }

        if (window.aksrt && aksrt.notyf) {
            aksrt.notyf(data.message || '登录成功', 'success');
        } else if (typeof window.aksrtToast === 'function') {
            window.aksrtToast(data.message || '登录成功', 'success');
        }

        var redirect = modal.dataset.redirect || data.redirect;
        if (redirect && redirect !== window.location.href) {
            setTimeout(function () {
                window.location.href = redirect;
            }, 500);
            return;
        }

        setTimeout(function () {
            window.location.reload();
        }, 500);
    }

    function updateNavUser(user) {
        document.querySelectorAll('.nav-user__avatar img, .nav-user__toggle img').forEach(function (image) {
            if (user.avatar_url) {
                image.src = user.avatar_url;
            }
        });

        document.querySelectorAll('.nav-user__name').forEach(function (el) {
            if (user.display_name) {
                el.textContent = user.display_name;
            }
        });
    }

    function showMessage(panel, message, type) {
        var box = document.getElementById('aksrt-modal-' + panel + '-error');
        if (!box) {
            return;
        }

        box.innerHTML = message;
        box.hidden = false;
        box.classList.toggle('is-success', type === 'success');
    }

    function clearMessages() {
        if (!modal) {
            return;
        }

        modal.querySelectorAll('.aksrt-modal-auth__error').forEach(function (box) {
            box.hidden = true;
            box.innerHTML = '';
            box.classList.remove('is-success');
        });
    }

    function setLoading(form, loading) {
        var submit = form.querySelector('.aksrt-modal-auth__submit');
        if (!submit) {
            return;
        }

        var label = submit.querySelector('span');
        var spinner = submit.querySelector('i');
        submit.disabled = loading;

        if (label) {
            label.hidden = loading;
        }
        if (spinner) {
            spinner.hidden = !loading;
        }
    }

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

    // ── QR Code Login (§10.7) ──

    
    function bindWeixingzhCodeForm(container) {
        if (!container) return;
        var form = container.querySelector('[data-aksrt-weixingzh-code]');
        if (!form || form._bound) return;
        form._bound = true;
        form.addEventListener('submit', function (e) {
            e.preventDefault();
            var input = form.querySelector('[name="code"]');
            var code = input ? String(input.value || '').trim() : '';
            if (!code) return;
            var btn = form.querySelector('button[type="submit"]');
            if (btn) btn.disabled = true;
            request('/auth/weixingzh-code', { code: code })
                .then(function (result) {
                    var data = (result && result.data) || result || {};
                    if ((result && result.ok) || (result && result.success) || data.logged_in) {
                        onAuthSuccess(data.data || data);
                        return;
                    }
                    throw new Error((result && (result.message || result.msg)) || '验证码错误');
                })
                .catch(function (err) {
                    alert(err.message || '登录失败');
                })
                .finally(function () {
                    if (btn) btn.disabled = false;
                });
        });
    }

    function initQrLogin() {
        var qrPanel = modal.querySelector('[data-panel="qrcode"]');
        if (!qrPanel) return;

        var qrContainer = qrPanel.querySelector('.aksrt-modal-auth__qr-code');
        if (!qrContainer) return;

        // When qrcode tab is activated, fetch QR and start polling
        var observer = new MutationObserver(function () {
            if (qrPanel.classList.contains('is-active')) {
                fetchQrCode(qrContainer);
            } else {
                stopQrPolling();
            }
        });
        observer.observe(qrPanel, { attributes: true, attributeFilter: ['class'] });
    }

    function fetchQrCode(container) {
        container.innerHTML = '<div class="aksrt-modal-auth__qr-loading"><i class="fas fa-spinner fa-spin"></i></div>';

        request('/auth/qrcode-login', {})
            .then(function (result) {
                var payload = (result && result.data) || result || {};
                var qrHtml = payload.qr_html || (payload.data && payload.data.qr_html) || '';
                var checkUrl = payload.check_url || (payload.data && payload.data.check_url) || '/auth/check-qrcode-login';
                var token = payload.token || (payload.data && payload.data.token) || '';
                if (qrHtml) {
                    container.innerHTML = qrHtml;
                    bindWeixingzhCodeForm(container);
                    if (checkUrl && token) {
                        startQrPolling(checkUrl, token);
                    }
                } else {
                    container.innerHTML = '<p class="aksrt-modal-auth__qr-error">扫码登录暂不可用</p>';
                }
            })
            .catch(function () {
                container.innerHTML = '<p class="aksrt-modal-auth__qr-error">网络错误</p>';
            });
    }

    function startQrPolling(checkUrl, token) {
        stopQrPolling();
        qrLoginTimer = setInterval(function () {
            request(checkUrl, { token: token })
                .then(function (result) {
                    var data = (result && result.data) || result || {};
                    var body = data.data || data;
                    if ((result && result.ok) || data.success || body.logged_in) {
                        if (body.logged_in || (data.data && data.data.logged_in)) {
                            stopQrPolling();
                            onAuthSuccess(body.data || body);
                        }
                    }
                })
                .catch(function () { /* keep polling */ });
        }, 2000);
    }

    function stopQrPolling() {
        if (qrLoginTimer) {
            clearInterval(qrLoginTimer);
            qrLoginTimer = null;
        }
    }

    // ── Social Login Priority (§10.7) ──

    function initSocialPriority() {
        var wxPriority = window.aksrtData && aksrtData.signinWxPriority;
        if (wxPriority && modal) {
            var wxBtn = modal.querySelector('.social-login-item.weixingzh, .social-login-item[data-provider="wechat"]');
            if (wxBtn) {
                setTimeout(function () { wxBtn.click(); }, 100);
            }
        }
    }

    // ── Agreement Check: shake instead of disable (§10.7) ──

    function initAgreementShake() {
        if (!modal) return;
        modal.querySelectorAll('.aksrt-modal-auth__submit').forEach(function (btn) {
            btn.addEventListener('click', function (e) {
                var form = btn.closest('form');
                if (!form) return;
                var agree = form.querySelector('[name="agree_terms"], [name="user_agreement"]');
                if (agree && !agree.checked) {
                    e.preventDefault();
                    e.stopImmediatePropagation();
                    agree.closest('label, .aksrt-modal-auth__agreement').classList.add('ani', 'shake');
                    if (window.aksrt && aksrt.notyf) aksrt.notyf('请先同意用户协议', 'warning');
                    setTimeout(function () {
                        agree.closest('label, .aksrt-modal-auth__agreement').classList.remove('ani', 'shake');
                    }, 400);
                }
            });
        });
    }

    // ── Password Visibility: unified (§10.7) ──
    // Already handled above; added unification note.

    window.AksrtAuth = {
        open: open,
        close: close,
    };

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', init);
    } else {
        init();
    }
})();