// Dashboard functionality for Marine Species API

class MarineDashboard {
    constructor() {
        this.currentImage = null;
        this.currentImageFile = null;
        this.isProcessing = false;
        
        this.initializeElements();
        this.bindEvents();
        this.checkAPIStatus();
        this.loadSampleImages();
    }

    initializeElements() {
        // Upload elements
        this.uploadArea = document.getElementById('uploadArea');
        this.fileInput = document.getElementById('fileInput');
        this.identifyBtn = document.getElementById('identifyBtn');
        
        // Settings elements
        this.confidenceSlider = document.getElementById('confidenceSlider');
        this.confidenceValue = document.getElementById('confidenceValue');
        this.iouSlider = document.getElementById('iouSlider');
        this.iouValue = document.getElementById('iouValue');
        
        // Display elements
        this.annotatedImageContainer = document.getElementById('annotatedImageContainer');
        
        // Results elements
        this.metadataSection = document.getElementById('metadataSection');
        this.speciesSection = document.getElementById('speciesSection');
        this.processingTime = document.getElementById('processingTime');
        this.speciesCount = document.getElementById('speciesCount');
        this.imageSize = document.getElementById('imageSize');
        this.speciesList = document.getElementById('speciesList');
        
        // Status elements
        this.statusDot = document.getElementById('statusDot');
        this.statusText = document.getElementById('statusText');
        this.modelInfo = document.getElementById('modelInfo');

        // Model details elements
        this.totalSpecies = document.getElementById('totalSpecies');
        this.deviceInfo = document.getElementById('deviceInfo');

        // Sample images
        this.sampleImagesSlider = document.getElementById('sampleImagesSlider');
        this.sliderPrev = document.getElementById('sliderPrev');
        this.sliderNext = document.getElementById('sliderNext');
    }

    bindEvents() {
        // Upload area events
        this.uploadArea.addEventListener('click', () => this.fileInput.click());
        this.uploadArea.addEventListener('dragover', this.handleDragOver.bind(this));
        this.uploadArea.addEventListener('dragleave', this.handleDragLeave.bind(this));
        this.uploadArea.addEventListener('drop', this.handleDrop.bind(this));
        
        // File input change
        this.fileInput.addEventListener('change', this.handleFileSelect.bind(this));
        
        // Settings sliders
        this.confidenceSlider.addEventListener('input', this.updateConfidenceValue.bind(this));
        this.iouSlider.addEventListener('input', this.updateIouValue.bind(this));
        
        // Identify button
        this.identifyBtn.addEventListener('click', this.identifySpecies.bind(this));

        // Slider controls
        this.sliderPrev.addEventListener('click', this.scrollSliderLeft.bind(this));
        this.sliderNext.addEventListener('click', this.scrollSliderRight.bind(this));
    }

    // API Status Check
    async checkAPIStatus() {
        try {
            const response = await fetch('/api/v1/health');
            const data = await response.json();
            
            if (data.model_loaded) {
                this.statusDot.className = 'status-dot healthy';
                this.statusText.textContent = 'API Ready';
                
                if (data.model_info) {
                    this.modelInfo.textContent = `Model: ${data.model_info.model_name} (${data.model_info.total_classes} species)`;
                    this.totalSpecies.textContent = data.model_info.total_classes;
                    this.deviceInfo.textContent = data.model_info.device;
                }
            } else {
                this.statusDot.className = 'status-dot error';
                this.statusText.textContent = 'Model Loading...';
                this.modelInfo.textContent = 'Please wait while the model loads';
            }
        } catch (error) {
            this.statusDot.className = 'status-dot error';
            this.statusText.textContent = 'API Unavailable';
            this.modelInfo.textContent = 'Unable to connect to API';
            console.error('API status check failed:', error);
        }
    }

    // Drag and Drop Handlers
    handleDragOver(e) {
        e.preventDefault();
        this.uploadArea.classList.add('dragover');
    }

    handleDragLeave(e) {
        e.preventDefault();
        this.uploadArea.classList.remove('dragover');
    }

    handleDrop(e) {
        e.preventDefault();
        this.uploadArea.classList.remove('dragover');
        
        const files = e.dataTransfer.files;
        if (files.length > 0) {
            this.processFile(files[0]);
        }
    }

    // File Selection Handler
    handleFileSelect(e) {
        const file = e.target.files[0];
        if (file) {
            this.processFile(file);
        }
    }

    // Process Selected File
    processFile(file) {
        // Validate file type
        if (!file.type.startsWith('image/')) {
            window.MarineAPI.utils.showNotification('Please select an image file', 'error');
            return;
        }

        // Validate file size (10MB limit)
        if (file.size > 10 * 1024 * 1024) {
            window.MarineAPI.utils.showNotification('File size must be less than 10MB', 'error');
            return;
        }

        this.currentImageFile = file;
        this.displayUploadedImage(file);
        this.identifyBtn.disabled = false;
        
        // Update upload area
        this.uploadArea.classList.add('has-image');
    }

    // Display Uploaded Image in Upload Area
    displayUploadedImage(file) {
        const reader = new FileReader();
        reader.onload = (e) => {
            this.currentImage = e.target.result;
            this.uploadArea.innerHTML = `
                <img src="${e.target.result}" alt="Uploaded image" style="width: 100%; height: 100%; object-fit: cover; border-radius: 8px;" />
            `;
        };
        reader.readAsDataURL(file);
    }

    // Settings Handlers
    updateConfidenceValue() {
        this.confidenceValue.textContent = `${this.confidenceSlider.value}%`;
    }

    updateIouValue() {
        this.iouValue.textContent = `${this.iouSlider.value}%`;
    }

    // Main Identification Function
    async identifySpecies() {
        if (!this.currentImage || this.isProcessing) return;

        this.isProcessing = true;
        window.MarineAPI.utils.setLoading(this.identifyBtn, true);

        try {
            // Prepare request data
            const requestData = {
                image: this.currentImage.split(',')[1], // Remove data:image/jpeg;base64, prefix
                confidence_threshold: this.confidenceSlider.value / 100,
                iou_threshold: this.iouSlider.value / 100,
                image_size: 640,
                return_annotated_image: true
            };

            // Make API request
            const response = await fetch('/api/v1/detect', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify(requestData)
            });

            if (!response.ok) {
                throw new Error(`API request failed: ${response.status}`);
            }

            const result = await response.json();
            this.displayResults(result);
            window.MarineAPI.utils.showNotification('Species identification completed!', 'success');

        } catch (error) {
            console.error('Identification failed:', error);
            window.MarineAPI.utils.showNotification('Identification failed. Please try again.', 'error');
        } finally {
            this.isProcessing = false;
            window.MarineAPI.utils.setLoading(this.identifyBtn, false);
        }
    }

    // Display Results
    displayResults(result) {
        const { detections, annotated_image, processing_time, image_dimensions } = result;

        // Display annotated image
        if (annotated_image) {
            this.annotatedImageContainer.innerHTML = `
                <img src="data:image/jpeg;base64,${annotated_image}" alt="Annotated results" />
            `;
        }

        // Update metadata
        this.processingTime.textContent = `${processing_time.toFixed(3)}s`;
        this.speciesCount.textContent = detections.length;
        this.imageSize.textContent = `${image_dimensions.width}×${image_dimensions.height}`;

        // Show metadata section
        this.metadataSection.style.display = 'block';

        // Display species list
        if (detections.length > 0) {
            this.speciesList.innerHTML = detections.map(detection => `
                <div class="species-item">
                    <span class="species-name">${detection.class_name}</span>
                    <span class="species-confidence">${(detection.confidence * 100).toFixed(1)}%</span>
                </div>
            `).join('');
            this.speciesSection.style.display = 'block';
        } else {
            this.speciesList.innerHTML = '<p class="no-detections">No marine species detected. Try adjusting the confidence threshold.</p>';
            this.speciesSection.style.display = 'block';
        }
    }

    // Load Sample Images
    loadSampleImages() {
        const sampleImages = [
            { name: 'crab.png', description: 'Crab Species' },
            { name: 'fish.png', description: 'Fish Species' },
            { name: 'fish_2.png', description: 'Fish Variety' },
            { name: 'fish_3.png', description: 'Marine Fish' },
            { name: 'fish_4.png', description: 'Ocean Fish' },
            { name: 'fish_5.png', description: 'Deep Sea Fish' },
            { name: 'flat_fish.png', description: 'Flatfish' },
            { name: 'flat_red_fish.png', description: 'Red Flatfish' },
            { name: 'jelly.png', description: 'Jellyfish' },
            { name: 'jelly_2.png', description: 'Jellyfish Species' },
            { name: 'jelly_3.png', description: 'Marine Jelly' },
            { name: 'puff.png', description: 'Pufferfish' },
            { name: 'red_fish.png', description: 'Red Fish' },
            { name: 'red_fish_2.png', description: 'Red Fish Species' },
            { name: 'scene.png', description: 'Marine Scene' },
            { name: 'scene_2.png', description: 'Ocean Scene' },
            { name: 'scene_3.png', description: 'Underwater Scene' },
            { name: 'scene_4.png', description: 'Deep Sea Scene' },
            { name: 'scene_5.png', description: 'Marine Habitat' },
            { name: 'scene_6.png', description: 'Ocean Floor' },
            { name: 'soft_coral.png', description: 'Soft Coral' },
            { name: 'starfish.png', description: 'Starfish' },
            { name: 'starfish_2.png', description: 'Sea Star' }
        ].map(img => ({
            ...img,
            url: `https://huggingface.co/seamo-ai/marina-species-v1/resolve/main/images/${img.name}`
        }));

        this.sampleImagesSlider.innerHTML = sampleImages.map(image => `
            <div class="sample-image-item" onclick="dashboard.loadSampleImage('${image.url}', '${image.name}')">
                <img src="${image.url}" alt="${image.description}" loading="lazy" />
                <div class="sample-image-overlay">${image.description}</div>
            </div>
        `).join('');
    }

    // Load Sample Image
    async loadSampleImage(imageUrl, imageName) {
        try {
            // Show loading state
            window.MarineAPI.utils.showNotification('Loading sample image...', 'info');

            let finalUrl = imageUrl;

            // Try local URL first, fallback to HuggingFace if needed
            try {
                const testResponse = await fetch(imageUrl, { method: 'HEAD' });
                if (!testResponse.ok) {
                    finalUrl = `https://huggingface.co/seamo-ai/marina-species-v1/resolve/main/images/${imageName}`;
                }
            } catch (e) {
                finalUrl = `https://huggingface.co/seamo-ai/marina-species-v1/resolve/main/images/${imageName}`;
            }

            // Fetch the image
            const response = await fetch(finalUrl);
            if (!response.ok) {
                throw new Error(`Failed to fetch image: ${response.status}`);
            }

            const blob = await response.blob();

            // Convert to File object
            const file = new File([blob], imageName, { type: blob.type });

            // Process the file
            this.processFile(file);

            window.MarineAPI.utils.showNotification('Sample image loaded successfully!', 'success');
        } catch (error) {
            console.error('Failed to load sample image:', error);
            window.MarineAPI.utils.showNotification('Failed to load sample image. Please try uploading your own image.', 'error');
        }
    }

    // Slider Control Functions
    scrollSliderLeft() {
        const containerWidth = this.sampleImagesSlider.clientWidth;
        this.sampleImagesSlider.scrollBy({
            left: -containerWidth, // Scroll by full container width (2 images)
            behavior: 'smooth'
        });
    }

    scrollSliderRight() {
        const containerWidth = this.sampleImagesSlider.clientWidth;
        this.sampleImagesSlider.scrollBy({
            left: containerWidth, // Scroll by full container width (2 images)
            behavior: 'smooth'
        });
    }
}

// Global function for copy to clipboard (used by API docs)
window.copyToClipboard = function(elementId) {
    const element = document.getElementById(elementId);
    if (!element) {
        console.error('Element not found:', elementId);
        return;
    }

    const text = element.textContent;

    if (navigator.clipboard && navigator.clipboard.writeText) {
        navigator.clipboard.writeText(text).then(() => {
            window.MarineAPI.utils.showNotification('Code copied to clipboard!', 'success');
        }).catch(err => {
            console.error('Failed to copy text: ', err);
            fallbackCopyTextToClipboard(text);
        });
    } else {
        fallbackCopyTextToClipboard(text);
    }
};

// Fallback copy function for older browsers
function fallbackCopyTextToClipboard(text) {
    const textArea = document.createElement("textarea");
    textArea.value = text;

    // Avoid scrolling to bottom
    textArea.style.top = "0";
    textArea.style.left = "0";
    textArea.style.position = "fixed";

    document.body.appendChild(textArea);
    textArea.focus();
    textArea.select();

    try {
        const successful = document.execCommand('copy');
        if (successful) {
            window.MarineAPI.utils.showNotification('Code copied to clipboard!', 'success');
        } else {
            window.MarineAPI.utils.showNotification('Failed to copy code', 'error');
        }
    } catch (err) {
        console.error('Fallback: Oops, unable to copy', err);
        window.MarineAPI.utils.showNotification('Failed to copy code', 'error');
    }

    document.body.removeChild(textArea);
}

// API Documentation Tabs
document.addEventListener('DOMContentLoaded', function() {
    const tabButtons = document.querySelectorAll('.tab-button');
    const tabContents = document.querySelectorAll('.tab-content');

    tabButtons.forEach(button => {
        button.addEventListener('click', function() {
            const targetTab = this.getAttribute('data-tab');

            // Remove active class from all buttons and contents
            tabButtons.forEach(b => b.classList.remove('active'));
            tabContents.forEach(c => c.classList.remove('active'));

            // Add active class to clicked button
            this.classList.add('active');

            // Show corresponding tab content
            const targetContent = document.getElementById(targetTab + '-tab');
            if (targetContent) {
                targetContent.classList.add('active');
            }
        });
    });
});

// Copy code functionality
function copyCode(elementId) {
    const codeElement = document.getElementById(elementId);
    const text = codeElement.textContent;

    navigator.clipboard.writeText(text).then(function() {
        // Find the copy button and show feedback
        const button = codeElement.parentElement.querySelector('.copy-button');
        const originalText = button.textContent;
        button.textContent = 'Copied!';
        button.classList.add('copied');

        setTimeout(() => {
            button.textContent = originalText;
            button.classList.remove('copied');
        }, 2000);
    }).catch(function(err) {
        console.error('Failed to copy text: ', err);
    });
}

// Make dashboard instance globally available for sample image clicks
let dashboard;

// Initialize dashboard when DOM is loaded
document.addEventListener('DOMContentLoaded', () => {
    dashboard = new MarineDashboard();
});