window.taxbaikAdminSession = {
    syncRouteClass: function () {
        document.documentElement.classList.toggle(
            'admin-login-route',
            window.location.pathname.toLowerCase().endsWith('/admin/login'));
    },

    getViewportWidth: function () {
        return window.innerWidth || document.documentElement.clientWidth || 0;
    },

    clearAuthToken: function () {
        try {
            localStorage.removeItem('accessToken');
            localStorage.removeItem('refreshToken');
            localStorage.removeItem('tokenExpiry');
            localStorage.removeItem('auth_token');
        } catch {
            // Ignore storage errors; redirect still recovers the session.
        }
    },

    showLoading: function () {
        if (document.documentElement.classList.contains('admin-login-route')) {
            window.taxbaikAdminSession.hideLoading();
            return;
        }

        const overlay = document.getElementById('blazor-loading');
        if (!overlay) return;

        // Show overlay immediately
        overlay.classList.add('show');

        // Check if page is already ready (cached state on fast nav)
        const pageReady =
            document.querySelector('.admin-page-hero') !== null ||
            document.querySelector('.admin-login-page') !== null;
        if (pageReady) {
            // Page already rendered, hide immediately
            window.taxbaikAdminSession.hideLoading();
            return;
        }

        // Start observer to catch future mutations
        if (window._taxbaikLoadingObserver) {
            window._taxbaikLoadingObserver.disconnect();
        }
        window._taxbaikLoadingObserver = new MutationObserver(function () {
            const pageReady =
                document.querySelector('.admin-page-hero') !== null ||
                document.querySelector('.admin-login-page') !== null;
            if (pageReady) {
                window.taxbaikAdminSession.hideLoading();
            }
        });
        window._taxbaikLoadingObserver.observe(document.body, {
            childList: true,
            subtree: true
        });

        // Safety fallback: hide after 3 seconds regardless.
        if (window._taxbaikLoadingTimeout) {
            clearTimeout(window._taxbaikLoadingTimeout);
        }
        window._taxbaikLoadingTimeout = setTimeout(function () {
            window.taxbaikAdminSession.hideLoading();
        }, 3000);
    },

    hideLoading: function () {
        const overlay = document.getElementById('blazor-loading');
        if (overlay) {
            overlay.classList.remove('show');
        }

        if (window._taxbaikLoadingTimeout) {
            clearTimeout(window._taxbaikLoadingTimeout);
            window._taxbaikLoadingTimeout = null;
        }

        if (window._taxbaikLoadingObserver) {
            window._taxbaikLoadingObserver.disconnect();
            window._taxbaikLoadingObserver = null;
        }
    },

    watchReconnect: function () {
        window.taxbaikAdminSession.syncRouteClass();
        window.addEventListener('popstate', window.taxbaikAdminSession.syncRouteClass);

        if (document.documentElement.classList.contains('admin-login-route')) {
            window.taxbaikAdminSession.hideLoading();
        }

        // Show loading on initial page load — overlay has 'show' from HTML,
        // but we still need to set up the observer to detect when to hide it.
        window.taxbaikAdminSession.showLoading();

        const modal = document.getElementById('components-reconnect-modal');
        if (!modal) return;

        const reloadOnRejectedCircuit = function () {
            const className = modal.className || '';
            if (className.includes('components-reconnect-failed') ||
                className.includes('components-reconnect-rejected')) {
                window.setTimeout(function () { window.location.reload(); }, 1500);
            }
        };

        new MutationObserver(reloadOnRejectedCircuit)
            .observe(modal, { attributes: true, attributeFilter: ['class'] });
    },

    bindLoginForm: function () {
        const form = document.getElementById('admin-login-form');
        if (!form || form.dataset.bound === '1') return;

        form.dataset.bound = '1';
        form.addEventListener('submit', async function (event) {
            event.preventDefault();

            const username = form.querySelector('input[placeholder="사용자명"]')?.value?.trim() || '';
            const password = form.querySelector('input[placeholder="비밀번호"]')?.value || '';
            const rememberMe = form.querySelector('input[type="checkbox"]')?.checked || false;
            const existing = form.parentElement.querySelector('.login-error-message');
            const submitButton = form.querySelector('button[type="submit"]');

            if (existing) existing.remove();
            if (submitButton) submitButton.disabled = true;

            try {
                const response = await fetch('/taxbaik/api/auth/login', {
                    method: 'POST',
                    headers: { 'Content-Type': 'application/json' },
                    body: JSON.stringify({ username, password })
                });

                if (!response.ok) {
                    throw new Error('login failed');
                }

                const data = await response.json();
                if (!data?.accessToken || !data?.refreshToken) {
                    throw new Error('invalid response');
                }

                localStorage.setItem('accessToken', data.accessToken);
                localStorage.setItem('refreshToken', data.refreshToken);
                localStorage.setItem('tokenExpiry', String(Date.now() + (data.expiresIn || 3600) * 1000));

                if (rememberMe) {
                    localStorage.setItem('admin-remembered-username', username);
                } else {
                    localStorage.removeItem('admin-remembered-username');
                }

                window.location.href = '/taxbaik/admin/dashboard';
            } catch {
                const error = document.createElement('div');
                error.className = 'mud-alert mud-alert-filled-error login-error-message mb-4';
                error.textContent = '로그인 중 오류가 발생했습니다.';
                form.parentElement.insertBefore(error, form);
            } finally {
                if (submitButton) submitButton.disabled = false;
            }
        });
    }
};

// 더존 ERP 스타일 엔터 키 포커스 이동 및 단축키 바인딩
document.addEventListener('keydown', function (e) {
    if (e.key === 'Enter') {
        const active = document.activeElement;
        if (!active) return;
        
        // 특정 영역(편집 폼 또는 다이얼로그) 내의 입력 필드만 포커스 이동 처리
        const container = active.closest('.admin-editor-panel, .mud-form, .mud-dialog');
        if (!container) return;

        // textarea나 button, submit 타입 등은 기본 동작(줄바꿈/제출) 유지
        if (active.tagName === 'TEXTAREA' || 
            active.tagName === 'BUTTON' || 
            active.getAttribute('type') === 'submit' ||
            active.classList.contains('mud-button-root')) {
            return;
        }

        e.preventDefault();

        // 포커스 이동 가능한 모든 입력 요소 수집
        const focusables = Array.from(container.querySelectorAll('input, select, textarea, button'))
            .filter(el => {
                const style = window.getComputedStyle(el);
                return el.tabIndex >= 0 && 
                       !el.disabled && 
                       el.getAttribute('aria-disabled') !== 'true' &&
                       style.display !== 'none' && 
                       style.visibility !== 'hidden';
            });

        const index = focusables.indexOf(active);
        if (index > -1 && index < focusables.length - 1) {
            const nextEl = focusables[index + 1];
            nextEl.focus();
            if (typeof nextEl.select === 'function') {
                nextEl.select();
            }
        }
    }
});