/**
 * UI Manager Module
 * Handles user interface updates, messages, and tree list display
 */
export class UIManager {
    constructor(authManager) {
        this.authManager = authManager;
    }

    initialize() {
        this.displayUserInfo();
        this.loadSelectedLocation();
        this.setupDemoUserUI();
    }

    displayUserInfo() {
        if (!this.authManager.currentUser) return;
        
        const userNameEl = document.getElementById('userName');
        const userRoleEl = document.getElementById('userRole');
        const userAvatarEl = document.getElementById('userAvatar');
        
        if (userNameEl) {
            userNameEl.textContent = this.authManager.currentUser.full_name;
        }
        
        if (userRoleEl) {
            userRoleEl.textContent = this.authManager.currentUser.role;
        }
        
        if (userAvatarEl) {
            userAvatarEl.textContent = this.authManager.currentUser.full_name.charAt(0).toUpperCase();
        }
    }

    loadSelectedLocation() {
        const selectedLocation = localStorage.getItem('selectedLocation');
        if (selectedLocation) {
            try {
                const location = JSON.parse(selectedLocation);
                const latElement = document.getElementById('latitude');
                const lngElement = document.getElementById('longitude');
                
                if (latElement && lngElement) {
                    latElement.value = location.lat.toFixed(6);
                    lngElement.value = location.lng.toFixed(6);
                    
                    // Clear the stored location
                    localStorage.removeItem('selectedLocation');
                    
                    this.showMessage('Location loaded from map!', 'success');
                }
            } catch (error) {
                console.error('Error loading selected location:', error);
            }
        }
    }

    showMessage(message, type) {
        const messageDiv = document.getElementById('message');
        if (!messageDiv) return;
        
        messageDiv.className = `message ${type === 'error' ? 'error' : 'success'}`;
        messageDiv.textContent = message;
        
        // Auto-hide after 5 seconds
        setTimeout(() => {
            messageDiv.textContent = '';
            messageDiv.className = '';
        }, 5000);
    }

    renderTreeList(trees) {
        const treeList = document.getElementById('treeList');
        if (!treeList) return;
        
        if (trees.length === 0) {
            treeList.innerHTML = '<div class="loading">No trees recorded yet</div>';
            return;
        }
        
        // Compute display numbers for Ishita's trees created today
        const now = new Date();
        const y = now.getFullYear(), m = now.getMonth(), d = now.getDate();
        const isToday = (ts) => { try { const t=new Date(ts); return t.getFullYear()===y && t.getMonth()===m && t.getDate()===d; } catch(_) { return false; } };
        const ishitaToday = trees.filter(t => (t.created_by||'').toLowerCase()==='ishita' && isToday(t.created_at));
        // Sort by created_at ascending to assign small to early ones
        ishitaToday.sort((a,b) => new Date(a.created_at) - new Date(b.created_at));
        const ishitaIndex = new Map();
        ishitaToday.forEach((t, idx) => ishitaIndex.set(t.id, idx+1));

        treeList.innerHTML = trees.map(tree => {
            const canEdit = this.authManager.canEditTree(tree.created_by);
            const canDelete = this.authManager.canDeleteTree(tree.created_by);
            
            return `
                <div class="tree-item" data-tree-id="${tree.id}">
                    <div class="tree-header">
                        <div class="tree-id">Tree #${tree.id}${ishitaIndex.has(tree.id) ? ` (Ishita No. ${ishitaIndex.get(tree.id)})` : ''}</div>
                        <div class="tree-actions">
                            ${canEdit ? `<button class="btn-icon edit-tree" data-tree-id="${tree.id}" title="Edit Tree">Edit</button>` : ''}
                            ${canDelete ? `<button class="btn-icon delete-tree" data-tree-id="${tree.id}" title="Delete Tree">Delete</button>` : ''}
                        </div>
                    </div>
                    <div class="tree-info">
                        ${tree.scientific_name || tree.common_name || tree.local_name || 'Unnamed'}
                        ${tree.location_name ? `<br><strong>Location:</strong> ${this.escapeHtml(tree.location_name)}` : ''}
                        <br>${tree.latitude.toFixed(4)}, ${tree.longitude.toFixed(4)}
                        ${tree.tree_code ? `<br>Code: ${tree.tree_code}` : ''}
                        <br>${new Date(tree.created_at).toLocaleDateString()}
                        <br>By: ${tree.created_by || 'Unknown'}
                    </div>
                </div>
            `;
        }).join('');
    }

    escapeHtml(text) {
        if (typeof text !== 'string') return text;
        return text
            .replace(/&/g, '&amp;')
            .replace(/</g, '&lt;')
            .replace(/>/g, '&gt;')
            .replace(/"/g, '&quot;')
            .replace(/'/g, '&#039;');
    }

    showLoadingState(containerId, message = 'Loading...') {
        const container = document.getElementById(containerId);
        if (!container) return;
        
        container.innerHTML = `
            <div class="loading">
                <div class="spinner"></div>
                ${message}
            </div>
        `;
    }

    showErrorState(containerId, message = 'Error loading content') {
        const container = document.getElementById(containerId);
        if (!container) return;
        
        container.innerHTML = `<div class="loading">${message}</div>`;
    }

    updateLocationButtonState(isGetting) {
        const locationBtn = document.getElementById('getLocation');
        if (!locationBtn) return;
        
        locationBtn.textContent = isGetting ? 'Getting...' : 'Get GPS Location';
        locationBtn.disabled = isGetting;
    }

    highlightAutoFilledField(fieldId) {
        const input = document.getElementById(fieldId);
        if (input && !input.value.trim()) {
            input.style.backgroundColor = '#f0f9ff';
            setTimeout(() => {
                input.style.backgroundColor = '';
            }, 2000);
        }
    }

    createFileInput(accept, capture = false) {
        const input = document.createElement('input');
        input.type = 'file';
        input.accept = accept;
        if (capture) {
            input.capture = 'environment';
        }
        return input;
    }

    confirmDeletion(treeId) {
        return confirm(`Are you sure you want to delete Tree #${treeId}? This action cannot be undone.`);
    }

    scrollToTop() {
        window.scrollTo({ top: 0, behavior: 'smooth' });
    }

    focusFirstError() {
        const firstError = document.querySelector('.form-input.error, .message.error');
        if (firstError) {
            firstError.scrollIntoView({ behavior: 'smooth', block: 'center' });
            if (firstError.focus) {
                firstError.focus();
            }
        }
    }

    addFieldError(fieldId, message) {
        const field = document.getElementById(fieldId);
        if (!field) return;
        
        field.classList.add('error');
        
        // Remove existing error message
        const existingError = field.parentNode.querySelector('.field-error');
        if (existingError) {
            existingError.remove();
        }
        
        // Add error message
        const errorEl = document.createElement('div');
        errorEl.className = 'field-error';
        errorEl.textContent = message;
        field.parentNode.appendChild(errorEl);
    }

    clearFieldErrors() {
        document.querySelectorAll('.form-input.error').forEach(field => {
            field.classList.remove('error');
        });
        
        document.querySelectorAll('.field-error').forEach(error => {
            error.remove();
        });
    }

    showUploadProgress(filename, progress) {
        // This could be expanded for actual progress tracking
        console.log(`Uploading ${filename}: ${progress}%`);
    }

    setupDemoUserUI() {
        if (!this.authManager.isDemoUser()) {
            return; // Not a demo user, no changes needed
        }

        // Add demo notice at the top of the form
        this.addDemoNotice();
        
        // Disable submit button and update its appearance
        this.disableSubmitButtonForDemo();
        
        // Show welcome button for demo users
        this.showWelcomeButton();
    }

    addDemoNotice() {
        const formCard = document.querySelector('.tt-card .tt-card-content');
        if (!formCard) return;

        const demoNotice = document.createElement('div');
        demoNotice.className = 'demo-notice';
        demoNotice.innerHTML = `
            <div class="demo-notice-icon">i</div>
            <div>
                <strong>Demo Mode</strong> - You're exploring TreeTrack! 
                Feel free to test all features and fill out the form. 
                <em>Note: Data won't be permanently saved in this demo environment.</em>
            </div>
        `;
        
        // Insert before the form
        const form = document.getElementById('treeForm');
        if (form) {
            formCard.insertBefore(demoNotice, form);
        }
    }

    disableSubmitButtonForDemo() {
        const submitBtn = document.querySelector('button[type="submit"]');
        if (!submitBtn) return;

        // Update button text and styling
        submitBtn.textContent = 'Try TreeTrack - Demo Mode';
        submitBtn.classList.add('tt-btn-demo-disabled');
        submitBtn.disabled = true;
        
        // Add tooltip on hover
        submitBtn.title = 'This is a demo environment - data won\'t be permanently saved';
        
        // Override the form submission to show demo message
        submitBtn.setAttribute('data-demo-disabled', 'true');
    }

    isDemoButtonDisabled() {
        const submitBtn = document.querySelector('button[type="submit"]');
        return submitBtn && submitBtn.getAttribute('data-demo-disabled') === 'true';
    }
    
    showWelcomeButton() {
        const welcomeBtn = document.getElementById('welcomeBtn');
        if (welcomeBtn) {
            welcomeBtn.style.display = 'inline-flex';
        }
    }
}