/**
 * 헤더 프로필 드롭다운
 */
(function initAuthHeader() {
    const DEFAULT_AVATAR =
        'data:image/svg+xml,' +
        encodeURIComponent(
            '<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="#94a3b8"><path d="M12 12c2.7 0 4.8-2.1 4.8-4.8S14.7 2.4 12 2.4 7.2 4.5 7.2 7.2 9.3 12 12 12zm0 2.4c-3.2 0-9.6 1.6-9.6 4.8v2.4h19.2v-2.4c0-3.2-6.4-4.8-9.6-4.8z"/></svg>',
        );

    let currentUser = null;
    let dropdownOpen = false;

    /**
     * HTML 이스케이프
     * @param {string} str
     * @returns {string}
     */
    function escapeHtml(str) {
        return String(str ?? '')
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;');
    }

    /**
     * 드롭다운 닫기
     */
    function closeDropdown() {
        const dd = document.getElementById('auth-dropdown');
        if (dd) dd.classList.remove('open');
        dropdownOpen = false;
    }

    /**
     * 아바타 이미지 src (캐시 무효화 포함)
     * @param {object|null} user
     * @returns {string}
     */
    function resolveAvatarSrc(user) {
        const raw = user?.avatarUrl;
        if (!raw) return DEFAULT_AVATAR;
        let src =
            window.UaDeckApi?.resolveMediaUrl
                ? window.UaDeckApi.resolveMediaUrl(raw) || raw
                : raw;
        if (user?.updatedAt && src && !src.startsWith('data:')) {
            src += (src.includes('?') ? '&' : '?') + 't=' + encodeURIComponent(user.updatedAt);
        }
        return src;
    }

    /**
     * 아바타 HTML
     * @param {object|null} user
     * @returns {string}
     */
    function avatarHtml(user) {
        const src = resolveAvatarSrc(user);
        return `<img src="${src}" alt="profile" onerror="this.src='${DEFAULT_AVATAR}'" />`;
    }

    /**
     * 프로필 버튼 HTML (아바타 + 사용자명)
     * @param {object|null} user
     * @returns {string}
     */
    function profileBtnHtml(user) {
        const avatar = avatarHtml(user);
        if (!user?.username) {
            return `<span class="auth-avatar-wrap">${avatar}</span>`;
        }
        return `
            <span class="auth-avatar-wrap">${avatar}</span>
            <span class="auth-username">${escapeHtml(user.username)}</span>
        `;
    }

    /**
     * 드롭다운 메뉴 렌더
     */
    function renderDropdown() {
        const dd = document.getElementById('auth-dropdown');
        if (!dd) return;

        if (!currentUser) {
            dd.innerHTML = `
                <a href="/login.html" class="auth-dropdown-item">로그인</a>
                <a href="/signup.html" class="auth-dropdown-item">회원가입</a>
            `;
            return;
        }

        const adminLink =
            currentUser.role === 'admin'
                ? `<a href="/admin.html" class="auth-dropdown-item">관리자</a>`
                : '';

        dd.innerHTML = `
            <div class="auth-dropdown-header">
                <div class="auth-dropdown-name">${currentUser.username}</div>
                <div class="auth-dropdown-email">${currentUser.email || ''}</div>
            </div>
            <a href="/profile.html" class="auth-dropdown-item">내 프로필</a>
            <a href="/deckHistory.html" class="auth-dropdown-item">내 덱 관리</a>
            <a href="/preset.html" class="auth-dropdown-item">공개 덱</a>
            ${adminLink}
            <div class="auth-dropdown-divider"></div>
            <button type="button" class="auth-dropdown-item danger" id="auth-logout-btn">로그아웃</button>
        `;

        const logoutBtn = document.getElementById('auth-logout-btn');
        if (logoutBtn) {
            logoutBtn.addEventListener('click', () => {
                window.UaDeckApi.logout();
                currentUser = null;
                closeDropdown();
                location.href = '/';
            });
        }
    }

    /**
     * 헤더 UI 갱신
     */
    function renderHeader() {
        const btn = document.getElementById('auth-avatar-btn');
        if (btn) {
            btn.innerHTML = profileBtnHtml(currentUser);
            btn.classList.toggle('auth-profile-btn--named', Boolean(currentUser?.username));
        }
        renderDropdown();
    }

    /**
     * 슬롯에 헤더 마운트
     * @param {HTMLElement} slot
     */
    function mount(slot) {
        slot.innerHTML = `
            <div class="auth-header-wrap">
                <button type="button" id="auth-avatar-btn" class="auth-avatar-btn" aria-label="계정 메뉴">
                    ${profileBtnHtml(currentUser)}
                </button>
                <div id="auth-dropdown" class="auth-dropdown"></div>
            </div>
        `;

        document.getElementById('auth-avatar-btn').addEventListener('click', async (e) => {
            e.stopPropagation();
            dropdownOpen = !dropdownOpen;
            const dd = document.getElementById('auth-dropdown');
            if (dropdownOpen) {
                await refreshCurrentUser();
                renderHeader();
                dd.classList.add('open');
            } else {
                dd.classList.remove('open');
            }
        });

        document.addEventListener('click', closeDropdown);
    }

    /**
     * 서버에서 최신 사용자 정보 동기화
     */
    async function refreshCurrentUser() {
        if (!window.UaDeckApi?.getToken()) {
            currentUser = null;
            return;
        }
        try {
            const { user } = await window.UaDeckApi.getMe();
            currentUser = user;
            window.UaDeckApi.saveAuth(window.UaDeckApi.getToken(), user);
        } catch {
            window.UaDeckApi.logout();
            currentUser = null;
        }
    }

    /**
     * 초기화
     */
    async function init() {
        currentUser = window.UaDeckApi.getCachedUser();
        await refreshCurrentUser();

        const slot = document.getElementById('auth-header-slot');
        if (slot) {
            mount(slot);
            renderHeader();
        } else {
            renderHeader();
        }
    }

    document.addEventListener('DOMContentLoaded', init);

    window.UaDeckAuth = {
        getUser: () => currentUser,
        refresh: init,
        refreshCurrentUser,
    };
})();