// NextSnap - Authentication logic
'use strict';

const Auth = {
    currentTab: 'tech',

    init() {
        // Tab switching
        document.querySelectorAll('.login-tab').forEach(tab => {
            tab.addEventListener('click', () => this.switchTab(tab.dataset.tab));
        });

        // Tech login form
        const techForm = document.getElementById('tech-login-form');
        if (techForm) {
            techForm.addEventListener('submit', (e) => this.handleTechLogin(e));
        }

        // Admin login form
        const adminForm = document.getElementById('admin-login-form');
        if (adminForm) {
            adminForm.addEventListener('submit', (e) => this.handleAdminLogin(e));
        }

        // Clear field errors on input
        document.querySelectorAll('.form-input').forEach(input => {
            input.addEventListener('input', () => {
                const errorEl = document.getElementById(input.id + '-error');
                if (errorEl) errorEl.textContent = '';
                input.classList.remove('error');
            });
        });
    },

    switchTab(tab) {
        this.currentTab = tab;

        // Update tab buttons
        document.querySelectorAll('.login-tab').forEach(t => {
            t.classList.toggle('active', t.dataset.tab === tab);
        });

        // Show/hide forms
        const techForm = document.getElementById('tech-login-form');
        const adminForm = document.getElementById('admin-login-form');
        const helpText = document.getElementById('login-help');

        if (tab === 'tech') {
            techForm.style.display = '';
            adminForm.style.display = 'none';
            helpText.innerHTML = '<strong>Tip:</strong> Use your username and PIN to login';
            const field = document.getElementById('tech-username');
            if (field) field.focus();
        } else {
            techForm.style.display = 'none';
            adminForm.style.display = '';
            helpText.innerHTML = '<strong>Tip:</strong> Use your Nextcloud admin credentials';
            const field = document.getElementById('admin-username');
            if (field) field.focus();
        }

        // Clear errors on tab switch
        document.querySelectorAll('.error-message').forEach(el => el.classList.add('hidden'));
        document.querySelectorAll('.field-error').forEach(el => el.textContent = '');
        document.querySelectorAll('.form-input').forEach(el => el.classList.remove('error'));
    },

    _setLoading(btn, loading) {
        const text = btn.querySelector('.btn-text');
        const spinner = btn.querySelector('.btn-loading');
        btn.disabled = loading;
        text.classList.toggle('hidden', loading);
        spinner.classList.toggle('hidden', !loading);
    },

    async handleTechLogin(event) {
        event.preventDefault();

        const username = document.getElementById('tech-username').value.trim();
        const pin = document.getElementById('tech-pin').value;
        const errorMessage = document.getElementById('tech-error-message');
        const btn = document.getElementById('tech-login-btn');

        if (!username) {
            document.getElementById('tech-username-error').textContent = 'Username is required';
            document.getElementById('tech-username').classList.add('error');
            return;
        }
        if (!pin) {
            document.getElementById('tech-pin-error').textContent = 'PIN is required';
            document.getElementById('tech-pin').classList.add('error');
            return;
        }

        errorMessage.classList.add('hidden');
        this._setLoading(btn, true);

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

            const data = await response.json();

            if (response.ok && data.success) {
                window.location.href = '/capture';
            } else {
                errorMessage.textContent = data.error || 'Login failed. Please check your credentials.';
                errorMessage.classList.remove('hidden');
            }
        } catch (error) {
            console.error('Login error:', error);
            errorMessage.textContent = 'Network error. Please check your connection and try again.';
            errorMessage.classList.remove('hidden');
        } finally {
            this._setLoading(btn, false);
        }
    },

    async handleAdminLogin(event) {
        event.preventDefault();

        const username = document.getElementById('admin-username').value.trim();
        const password = document.getElementById('admin-password').value;
        const errorMessage = document.getElementById('admin-error-message');
        const btn = document.getElementById('admin-login-btn');

        if (!username) {
            document.getElementById('admin-username-error').textContent = 'Username is required';
            document.getElementById('admin-username').classList.add('error');
            return;
        }
        if (!password) {
            document.getElementById('admin-password-error').textContent = 'Password is required';
            document.getElementById('admin-password').classList.add('error');
            return;
        }

        errorMessage.classList.add('hidden');
        this._setLoading(btn, true);

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

            const data = await response.json();

            if (response.ok && data.success) {
                window.location.href = '/capture';
            } else {
                errorMessage.textContent = data.error || 'Login failed. Please check your credentials.';
                errorMessage.classList.remove('hidden');
            }
        } catch (error) {
            console.error('Login error:', error);
            errorMessage.textContent = 'Network error. Please check your connection and try again.';
            errorMessage.classList.remove('hidden');
        } finally {
            this._setLoading(btn, false);
        }
    },

    async checkStatus() {
        try {
            const response = await fetch('/api/auth/status');
            const data = await response.json();
            return data.authenticated ? data : null;
        } catch (error) {
            console.error('Auth status check failed:', error);
            return null;
        }
    },

    async logout() {
        try {
            await fetch('/api/auth/logout', { method: 'POST' });
            window.location.href = '/';
        } catch (error) {
            console.error('Logout error:', error);
            window.location.href = '/';
        }
    }
};

// Initialize when DOM is ready
if (document.readyState === 'loading') {
    document.addEventListener('DOMContentLoaded', () => Auth.init());
} else {
    Auth.init();
}