/* ===== Cloud Image Browser Page ===== */
window.NAICloud = {
    dates: [],
    images: [],
    displayedCount: 0,
    BATCH_SIZE: 30,
    selectedPath: null,
    selectedInfo: null,
    currentDate: '',
    syncing: false,
    batch: null,
    searchQuery: '',
    searchTimeout: null,
    _scrollHandler: null,

    async loadDates() {
        try {
            const resp = await fetch('/api/cloud/dates');
            const data = await resp.json();
            this.dates = data.dates || [];
        } catch (e) {
            this.dates = [];
        }
        this.renderDateList();
    },

    async loadImages(date) {
        this.currentDate = date || '';
        try {
            let url;
            if (this.searchQuery.trim()) {
                url = `/api/cloud/search?q=${encodeURIComponent(this.searchQuery)}&date=${encodeURIComponent(date)}`;
            } else {
                url = `/api/cloud/images?date=${encodeURIComponent(date)}`;
            }
            const resp = await fetch(url);
            const data = await resp.json();
            this.images = data.images || [];
        } catch (e) {
            this.images = [];
        }
        this.displayedCount = 0;
        this.renderGrid();
    },

    onSearchInput(value) {
        this.searchQuery = value;
        clearTimeout(this.searchTimeout);
        this.searchTimeout = this.currentDate ? setTimeout(() => this.loadImages(this.currentDate), 300) : null;
    },

    async selectImage(path) {
        this.selectedPath = path;
        $$('.cloud-card').forEach(c => {
            c.classList.toggle('selected', c.dataset.path === path);
        });

        const detail = $('#cloud-detail');
        detail.style.display = 'flex';
        $('#cloud-empty-detail').style.display = 'none';

        // Load full image
        const imgEl = $('#cloud-detail-img');
        imgEl.src = '';
        imgEl.alt = 'Loading...';

        try {
            const resp = await fetch(`/api/cloud/image?path=${encodeURIComponent(path)}`);
            const data = await resp.json();
            if (data.image) {
                const dataUrl = 'data:image/png;base64,' + data.image;
                imgEl.src = dataUrl;
                imgEl.addEventListener('click', () => {
                    if (document.fullscreenElement) {    
                        document.exitFullscreen(); 
                    } else {  
                        imgEl.requestFullscreen();       
                    }
                });
                // Parse PNG info
                const binary = atob(data.image);
                const bytes = new Uint8Array(binary.length);
                for (let i = 0; i < binary.length; i++) bytes[i] = binary.charCodeAt(i);

                const textChunks = await NAIPngInfo.readPngTextChunks(bytes.buffer);
                const img = await NAIUtils.loadImageFromDataUrl(dataUrl);
                const canvas = document.createElement('canvas');
                canvas.width = img.naturalWidth;
                canvas.height = img.naturalHeight;
                const ctx = canvas.getContext('2d', { willReadFrequently: true });
                ctx.drawImage(img, 0, 0);
                const imageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
                const stealthInfo = await NAIPngInfo.readStealthInfo(imageData, canvas.width, canvas.height);
                const parsed = NAIPngInfo.parseInfo(textChunks, stealthInfo, img.naturalWidth, img.naturalHeight);
                this.selectedInfo = parsed;
                this._selectedB64 = data.image;

                this.renderParams(parsed);
            }
        } catch (e) {
            console.error('Failed to load cloud image:', e);
        }

        // Meta
        const item = this.images.find(i => i.path === path);
        const metaEl = $('#cloud-detail-meta');
        if (item) {
            metaEl.innerHTML = `
                <div class="history-meta-row"><span class="history-meta-key">文件:</span><span>${item.name}</span></div>
                <div class="history-meta-row"><span class="history-meta-key">日期:</span><span>${item.date}</span></div>
            `;
        }
    },

    renderDateList() {
        const list = $('#cloud-date-list');
        list.innerHTML = '';

        // "All" option
        const allItem = document.createElement('div');
        allItem.className = 'cloud-date-item' + (!this.currentDate ? ' active' : '');
        allItem.textContent = `全部`;
        allItem.addEventListener('click', () => {
            this.currentDate = '';
            this.loadImages('');
            $$('.cloud-date-item').forEach(d => d.classList.remove('active'));
            allItem.classList.add('active');
        });
        list.appendChild(allItem);

        for (const d of this.dates) {
            const item = document.createElement('div');
            item.className = 'cloud-date-item' + (d.date === this.currentDate ? ' active' : '');
            item.innerHTML = `<span>${d.date}</span><span class="cloud-date-count">${d.count}</span>`;
            item.addEventListener('click', () => {
                this.currentDate = d.date;
                this.loadImages(d.date);
                $$('.cloud-date-item').forEach(di => di.classList.remove('active'));
                item.classList.add('active');
            });
            list.appendChild(item);
        }
    },

    _renderCards(items) {
        const grid = $('#cloud-grid');
        for (const item of items) {
            const card = document.createElement('div');
            card.className = 'cloud-card history-card' + (item.path === this.selectedPath ? ' selected' : '');
            card.dataset.path = item.path;

            // Use thumbnail endpoint (lazy: load full only on select)
            const img = document.createElement('img');
            img.loading = 'lazy';
            img.src = `/api/cloud/image?path=${encodeURIComponent(item.path)}`;
            img.alt = item.name;
            img.style.background = 'var(--bg-input)';

            // Fetch thumbnail via API
            fetch(`/api/cloud/image?path=${encodeURIComponent(item.path)}`)
                .then(r => r.json())
                .then(data => {
                    if (data.image) img.src = 'data:image/png;base64,' + data.image;
                })
                .catch(() => {});

            card.appendChild(img);

            const badge = document.createElement('div');
            badge.className = 'history-card-badge';
            badge.textContent = item.name.split('-').pop()?.replace('.png', '') || '';
            card.appendChild(badge);

            card.dataset.batchId = item.path;

            if (this.batch?.batchMode) {
                const cbWrap = document.createElement('div');
                cbWrap.className = 'batch-checkbox-wrap';
                const cb = document.createElement('input');
                cb.type = 'checkbox';
                cb.className = 'batch-checkbox';
                cb.checked = this.batch.selected.has(item.path);
                cbWrap.appendChild(cb);
                card.appendChild(cbWrap);

                if (this.batch.selected.has(item.path)) {
                    card.classList.add('batch-selected');
                }

                card.addEventListener('click', (e) => {
                    if (e.shiftKey) {
                        this.batch.rangeSelect(item.path);
                    } else {
                        this.batch.toggleItem(item.path);
                    }
                });
            } else {
                card.addEventListener('click', () => this.selectImage(item.path));
            }
            grid.appendChild(card);
        }
    },

    loadMoreImages() {
        if (this.displayedCount >= this.images.length) return;

        const nextBatch = this.images.slice(this.displayedCount, this.displayedCount + this.BATCH_SIZE);
        this._renderCards(nextBatch);
        this.displayedCount += nextBatch.length;

        // Update load-more indicator
        this._updateLoadMoreIndicator();
    },

    _updateLoadMoreIndicator() {
        const grid = $('#cloud-grid');
        const existing = grid.parentElement.querySelector('.cloud-load-more-indicator');
        if (existing) existing.remove();

        if (this.displayedCount < this.images.length) {
            const indicator = document.createElement('div');
            indicator.className = 'cloud-load-more-indicator';
            indicator.style.cssText = 'text-align:center;padding:12px;color:var(--text-secondary,#888);font-size:13px;';
            indicator.textContent = `已加载 ${this.displayedCount} / ${this.images.length} 张，下滑加载更多...`;
            grid.parentElement.appendChild(indicator);
        }
    },

    _onScrollContainer() {
        const container = $('.cloud-grid-body');
        if (!container) return;

        const scrollTop = container.scrollTop;
        const scrollHeight = container.scrollHeight;
        const clientHeight = container.clientHeight;

        // When scrolled to within 200px of the bottom, load more
        if (scrollTop + clientHeight >= scrollHeight - 200) {
            this.loadMoreImages();
        }
    },

    _setupScrollListener() {
        const container = $('.cloud-grid-body');
        if (!container) return;

        // Remove old listener if exists
        if (this._scrollHandler) {
            container.removeEventListener('scroll', this._scrollHandler);
        }

        this._scrollHandler = () => this._onScrollContainer();
        container.addEventListener('scroll', this._scrollHandler);
    },

    renderGrid() {
        const grid = $('#cloud-grid');
        const countEl = $('#cloud-count');
        grid.innerHTML = '';

        // Remove any existing load-more indicator
        const existingIndicator = grid.parentElement?.querySelector('.cloud-load-more-indicator');
        if (existingIndicator) existingIndicator.remove();

        if (countEl) countEl.textContent = `${this.images.length} 张`;

        if (this.images.length === 0) {
            grid.innerHTML = '<div class="history-empty">暂无图片</div>';
            return;
        }

        // Reset displayed count and load first batch
        this.displayedCount = 0;
        this.loadMoreImages();

        // Setup scroll listener for infinite scroll
        this._setupScrollListener();
    },

    renderParams(parsed) {
        const paramsEl = $('#cloud-detail-params');
        paramsEl.innerHTML = '';

        if (parsed.params && Object.keys(parsed.params).length > 0) {
            const order = ['prompt', 'uc', 'negative prompt', 'model', 'steps', 'sampler', 'scale', 'seed', 'width', 'height'];
            const shown = new Set();
            for (const key of order) {
                if (parsed.params[key] !== undefined) {
                    paramsEl.appendChild(this._row(key, parsed.params[key]));
                    shown.add(key);
                }
            }
            for (const [k, v] of Object.entries(parsed.params)) {
                if (shown.has(k)) continue;
                paramsEl.appendChild(this._row(k, typeof v === 'object' ? JSON.stringify(v) : v));
            }
            $('#btn-cloud-send-params').style.display = '';
        } else {
            paramsEl.innerHTML = '<div class="history-no-params">无可解析参数</div>';
            $('#btn-cloud-send-params').style.display = 'none';
        }
    },

    _row(key, value) {
        const row = document.createElement('div');
        row.className = 'pi-param-row';
        const vs = String(value);
        row.innerHTML = `<div class="pi-param-key">${key}</div><div class="pi-param-value" ${vs.length > 100 ? 'title="' + vs.replace(/"/g, '&quot;') + '"' : ''}>${vs}</div>`;
        return row;
    },

    // ── Actions ──
    sendParamsToGenerate() {
        if (!this.selectedInfo) return;
        const backup = NAIPngInfo.currentInfo;
        NAIPngInfo.currentInfo = this.selectedInfo;
        NAIPngInfo.sendToGenerate();
        NAIPngInfo.currentInfo = backup;
    },

    _getSelectedDataUrl() {
        if (!this._selectedB64) return null;
        return 'data:image/png;base64,' + this._selectedB64;
    },

    sendToExtraInput(mode) {
        const du = this._getSelectedDataUrl();
        if (!du) return;
        NAIExtraInput.clear();
        const r = document.querySelector(`input[name="extra-mode"][value="${mode}"]`);
        if (r) { r.checked = true; NAIExtraInput.setMode(mode); }
        NAIExtraInput.handleUploadFromDataUrl(du);
        const c = $('#extra-input-content');
        if (c && !c.classList.contains('open')) { c.classList.add('open'); $('#extra-input-arrow').textContent = '▼'; }
        document.querySelector('.nav-item[data-page="generate"]')?.click();
    },

    sendToVibe() {
        const du = this._getSelectedDataUrl();
        if (!du) return;
        fetch(du).then(r => r.blob()).then(blob => {
            NAIVibe.handleRefUpload([new File([blob], 'cloud.png', { type: 'image/png' })]);
            const c = $('#vibe-content');
            if (c && !c.classList.contains('open')) { c.classList.add('open'); $('#vibe-arrow').textContent = '▼'; }
            document.querySelector('.nav-item[data-page="generate"]')?.click();
        });
    },

    sendToDirectorTools() {
        const du = this._getSelectedDataUrl();
        if (!du) return;
        NAIDirectorTools._setInputFromDataUrl(du);
        document.querySelector('.nav-item[data-page="inpaint"]')?.click();
    },

    downloadSelected() {
        if (!this._selectedB64 || !this.selectedPath) return;
        const a = document.createElement('a');
        a.href = 'data:image/png;base64,' + this._selectedB64;
        a.download = this.selectedPath.split('/').pop() || 'image.png';
        document.body.appendChild(a); a.click(); document.body.removeChild(a);
    },

    async deleteSelected() {
        if (!this.selectedPath) return;
        if (!confirm(`确定删除 ${this.selectedPath}？将同时从云端删除。`)) return;
        try {
            await fetch('/api/cloud/delete', {
                method: 'POST',
                headers: { 'Content-Type': 'application/json' },
                body: JSON.stringify({ path: this.selectedPath }),
            });
            this.selectedPath = null;
            this.selectedInfo = null;
            this._selectedB64 = null;
            $('#cloud-detail').style.display = 'none';
            $('#cloud-empty-detail').style.display = 'flex';
            if (this.currentDate) await this.loadImages(this.currentDate);
            await this.loadDates();
        } catch (e) { console.error(e); }
    },

    async syncFromCloud() {
        if (this.syncing) return;
        this.syncing = true;
        const btn = $('#btn-cloud-sync');
        btn.disabled = true;
        btn.textContent = '同步中...';

        try {
            await fetch('/api/cloud/sync', { method: 'POST' });
            await this.loadDates();
            if (this.currentDate) await this.loadImages(this.currentDate);
        } catch (e) { console.error(e); }

        this.syncing = false;
        btn.disabled = false;
        btn.textContent = '🔄 同步';
    },

    init() {
        $('#btn-cloud-sync').addEventListener('click', () => this.syncFromCloud());
        $('#btn-cloud-send-params').addEventListener('click', () => this.sendParamsToGenerate());
        $('#btn-cloud-send-i2i').addEventListener('click', () => this.sendToExtraInput('img2img'));
        $('#btn-cloud-send-inp').addEventListener('click', () => this.sendToExtraInput('inpaint'));
        $('#btn-cloud-send-vib').addEventListener('click', () => this.sendToVibe());
        $('#btn-cloud-send-dt').addEventListener('click', () => this.sendToDirectorTools());
        $('#btn-cloud-download').addEventListener('click', () => this.downloadSelected());
        $('#btn-cloud-delete').addEventListener('click', () => this.deleteSelected());

        // Search
        $('#cloud-search-input').addEventListener('input', (e) => this.onSearchInput(e.target.value));
        $('#btn-cloud-search-clear').addEventListener('click', () => {
            $('#cloud-search-input').value = '';
            this.onSearchInput('');
        });

        // Batch mode
        this.batch = NAIBatch.create({
            gridSel: '#cloud-grid',
            toolbarSel: '#cloud-batch-toolbar',
            getItems: () => this.images,
            onDelete: async (paths) => {
                for (const path of paths) {
                    await fetch('/api/cloud/delete', {
                        method: 'POST',
                        headers: { 'Content-Type': 'application/json' },
                        body: JSON.stringify({ path }),
                    });
                }
                this.selectedPath = null;
                this.selectedInfo = null;
                this._selectedB64 = null;
                $('#cloud-detail').style.display = 'none';
                $('#cloud-empty-detail').style.display = 'flex';
                if (this.currentDate) await this.loadImages(this.currentDate);
                await this.loadDates();
            },
            getImageB64: async (path) => {
                const resp = await fetch(`/api/cloud/image?path=${encodeURIComponent(path)}`);
                const data = await resp.json();
                if (!data.image) return null;
                return { b64: data.image, filename: path.split('/').pop() || 'image.png' };
            },
            onRefreshGrid: () => this.renderGrid(),
        });

        $('#btn-cloud-batch-toggle').addEventListener('click', () => {
            this.batch.toggle();
            $('#btn-cloud-batch-toggle').classList.toggle('active', this.batch.batchMode);
        });

        const cbSelectAll = document.querySelector('#cloud-batch-toolbar .batch-select-all');
        if (cbSelectAll) {
            cbSelectAll.addEventListener('change', () => {
                cbSelectAll.checked ? this.batch.selectAll() : this.batch.selectNone();
            });
        }

        $('#btn-cloud-batch-download')?.addEventListener('click', () => this.batch.batchDownload());
        $('#btn-cloud-batch-delete')?.addEventListener('click', () => this.batch.batchDelete());

        document.querySelector('.nav-item[data-page="cloud"]')?.addEventListener('click', () => {
            this.loadDates();
            if (this.currentDate) this.loadImages(this.currentDate);
        });
    },
};