import { api } from '../api.js';
import { GestureHandler, PullToRefreshIndicator } from '../gesture-handler.js';

class PhotoGallery extends HTMLElement {
    constructor() {
        super();
        this.photos = [];
        this.boundHandleClick = this.handleClick.bind(this);
        this.gestureHandler = null;
        this.pullIndicator = null;
    }

    connectedCallback() {
        this.addEventListener('click', this.boundHandleClick);
        this.render();
        this.loadPhotos();
        this.initGestures();
    }

    disconnectedCallback() {
        this.removeEventListener('click', this.boundHandleClick);
        if (this.gestureHandler) {
            this.gestureHandler.destroy();
        }
        if (this.pullIndicator) {
            this.pullIndicator.destroy();
        }
    }

    initGestures() {
        const container = this.querySelector('.photo-gallery');
        if (!container) return;

        this.pullIndicator = new PullToRefreshIndicator(container);
        this.gestureHandler = new GestureHandler(container);

        this.gestureHandler.on('pullToRefresh', async () => {
            this.pullIndicator.showRefreshing();
            await this.loadPhotos();
            this.pullIndicator.hide();
        });

        container.addEventListener('pull-progress', (e) => {
            this.pullIndicator.setProgress(e.detail.progress);
        });

        container.addEventListener('pull-end', () => {
            if (this.pullIndicator) {
                this.pullIndicator.hide();
            }
        });
    }

    async loadPhotos() {
        try {
            this.photos = await api.getPhotos();
            this.renderPhotos();
        } catch (error) {
            console.error('Failed to load photos:', error);
            this.querySelector('.gallery-grid').innerHTML = '<p>Failed to load photos</p>';
        }
    }

    async renderPhotos() {
        const grid = this.querySelector('.gallery-grid');
        if (this.photos.length === 0) {
            grid.innerHTML = '';
            const header = this.querySelector('.gallery-header');
            const empty = document.createElement('p');
            empty.className = 'empty-state';
            empty.textContent = 'No photos found.';
            header.insertAdjacentElement('afterend', empty);
            return;
        }

        // Remove any existing empty-state
        const existingEmpty = this.querySelector('.empty-state');
        if (existingEmpty) existingEmpty.remove();

        grid.innerHTML = this.photos.map(photo => `
            <div class="photo-item" data-file-id="${photo.id}">
                <img
                    data-photo-id="${photo.id}"
                    alt="${photo.name}"
                    loading="lazy"
                    style="background: #f0f0f0;"
                >
                <div class="photo-info">
                    <span class="photo-name">${photo.name}</span>
                    <span class="photo-date">${new Date(photo.created_at).toLocaleDateString()}</span>
                </div>
            </div>
        `).join('');

        grid.querySelectorAll('img[data-photo-id]').forEach(async (img) => {
            const photoId = img.dataset.photoId;
            try {
                const response = await fetch(`/files/thumbnail/${photoId}`, {
                    headers: {
                        'Authorization': `Bearer ${api.getToken()}`
                    }
                });
                if (response.ok) {
                    const blob = await response.blob();
                    img.src = URL.createObjectURL(blob);
                } else {
                    img.style.display = 'none';
                }
            } catch (error) {
                img.style.display = 'none';
            }
        });

        this.attachListeners();
    }

    handleClick(e) {
        const photoItem = e.target.closest('.photo-item');
        if (photoItem) {
            const fileId = photoItem.dataset.fileId;
            const photo = this.photos.find(p => p.id === parseInt(fileId));
            this.dispatchEvent(new CustomEvent('photo-click', {
                detail: { photo },
                bubbles: true
            }));
        }
    }

    attachListeners() {
    }

    render() {
        this.innerHTML = `
            <div class="photo-gallery">
                <div class="gallery-header">
                    <h2>Photo Gallery</h2>
                </div>
                <div class="gallery-grid"></div>
            </div>
        `;
    }
}

customElements.define('photo-gallery', PhotoGallery);
export { PhotoGallery };