(function() {
/**
 * Nexus Terminal — snippet / command library.
 * Provides a panel for managing and sending reusable commands to active sessions.
 */

const { createElement, escapeHtml, dismissContextMenus } = window.NexusTerminal;

class SnippetLibrary {
    /**
     * @param {App} app
     */
    constructor(app) {
        this.app = app;
        /** @type {Array<Object>} */
        this.snippets = [];
        this.searchQuery = '';
    }

    // ── Public API ───────────────────────────────────────────────────

    /**
     * Opens the snippet library modal.
     */
    async open() {
        await this._loadSnippets();
        this._showModal();
    }

    /**
     * Sends a snippet command to the active session.
     * @param {string} command
     */
    sendToActiveSession(command) {
        const sessionId = this.app.state.activeSessionId;
        if (!sessionId) {
            this.app.notifications.error('No active session');
            return;
        }
        const session = this.app.state.getSession(sessionId);
        if (!session || session.state !== 'connected') {
            this.app.notifications.error('Session is not connected');
            return;
        }
        try {
            const b64 = btoa(command + '\n');
            window.go.api.Service.WriteSession(sessionId, b64);
            this.app.notifications.info('Snippet sent');
        } catch (err) {
            this.app.notifications.error('Failed to send snippet: ' + err);
        }
    }

    // ── Data ─────────────────────────────────────────────────────────

    /** @private */
    async _loadSnippets() {
        try {
            this.snippets = await window.go.api.Service.ListSnippets() || [];
        } catch (err) {
            this.snippets = [];
            console.error('Failed to load snippets:', err);
        }
    }

    // ── Modal ────────────────────────────────────────────────────────

    /** @private */
    _showModal() {
        const backdrop = createElement('div', 'modal-backdrop');
        const modal = createElement('div', 'modal modal-lg');

        modal.innerHTML = `
            <div class="modal-header">
                <h3 class="modal-title">Command Library</h3>
                <button class="btn btn-icon btn-xs modal-close">&times;</button>
            </div>
            <div class="modal-body snippet-body" style="display:flex;gap:var(--space-3);height:400px;">
                <div class="snippet-list-panel" style="flex:1;display:flex;flex-direction:column;gap:var(--space-2);overflow:hidden;">
                    <div style="display:flex;gap:var(--space-2);">
                        <input type="text" class="form-input snippet-search" placeholder="Search snippets…" style="flex:1;" />
                        <button class="btn btn-sm btn-primary snippet-add-btn">+ New</button>
                    </div>
                    <div class="snippet-list" style="flex:1;overflow-y:auto;"></div>
                </div>
                <div class="snippet-detail-panel" style="flex:1;display:flex;flex-direction:column;gap:var(--space-2);overflow:hidden;">
                    <div class="snippet-detail-empty" style="display:flex;align-items:center;justify-content:center;flex:1;color:var(--text-tertiary);font-size:var(--text-sm);">
                        Select a snippet or create a new one
                    </div>
                </div>
            </div>
        `;

        backdrop.appendChild(modal);
        document.body.appendChild(backdrop);
        requestAnimationFrame(() => {
            backdrop.classList.add('is-visible');
            modal.classList.add('is-visible');
        });

        const close = () => {
            backdrop.classList.remove('is-visible');
            modal.classList.remove('is-visible');
            setTimeout(() => backdrop.remove(), 200);
        };

        modal.querySelector('.modal-close').addEventListener('click', close);
        backdrop.addEventListener('click', (e) => { if (e.target === backdrop) close(); });

        // Search
        const searchInput = modal.querySelector('.snippet-search');
        searchInput.addEventListener('input', () => {
            this.searchQuery = searchInput.value.trim().toLowerCase();
            this._renderList(modal, close);
        });

        // New snippet button
        modal.querySelector('.snippet-add-btn').addEventListener('click', () => {
            this._showEditor(modal, null, close);
        });

        this._renderList(modal, close);
    }

    /** @private */
    _renderList(modal, closeFn) {
        const listEl = modal.querySelector('.snippet-list');
        if (!listEl) return;
        listEl.innerHTML = '';

        const filtered = this.snippets.filter((sn) => {
            if (!this.searchQuery) return true;
            return sn.name.toLowerCase().includes(this.searchQuery) ||
                   sn.command.toLowerCase().includes(this.searchQuery) ||
                   (sn.description || '').toLowerCase().includes(this.searchQuery);
        });

        if (filtered.length === 0) {
            listEl.innerHTML = '<div style="color:var(--text-tertiary);font-size:var(--text-sm);padding:var(--space-3);text-align:center;">No snippets found</div>';
            return;
        }

        for (const sn of filtered) {
            const item = createElement('div', 'snippet-item', {
                dataset: { id: sn.id },
            });
            item.style.cssText = 'padding:var(--space-2);border-radius:var(--radius-md);cursor:pointer;border:1px solid var(--border-subtle);';
            item.innerHTML = `
                <div style="font-weight:var(--weight-medium);font-size:var(--text-sm);color:var(--text-primary);">${escapeHtml(sn.name)}</div>
                <div style="font-family:var(--font-mono);font-size:var(--text-xs);color:var(--text-secondary);margin-top:2px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;">${escapeHtml(sn.command)}</div>
            `;
            item.addEventListener('click', () => this._showDetail(modal, sn, closeFn));
            item.addEventListener('mousedown', (e) => e.preventDefault());
            item.addEventListener('mouseenter', () => { item.style.background = 'var(--bg-hover)'; });
            item.addEventListener('mouseleave', () => { item.style.background = ''; });
            listEl.appendChild(item);
        }
    }

    /** @private */
    _showDetail(modal, snippet, closeFn) {
        const detailPanel = modal.querySelector('.snippet-detail-panel');
        if (!detailPanel) return;
        detailPanel.innerHTML = '';

        const nameEl = createElement('div', '', {
            innerHTML: `<strong style="font-size:var(--text-base);">${escapeHtml(snippet.name)}</strong>`,
        });
        detailPanel.appendChild(nameEl);

        if (snippet.description) {
            const descEl = createElement('div', '', {
                textContent: snippet.description,
            });
            descEl.style.cssText = 'font-size:var(--text-sm);color:var(--text-secondary);';
            detailPanel.appendChild(descEl);
        }

        const cmdEl = createElement('pre', '', {
            textContent: snippet.command,
        });
        cmdEl.style.cssText = 'flex:1;font-family:var(--font-mono);font-size:var(--text-sm);background:var(--bg-base);padding:var(--space-3);border-radius:var(--radius-md);overflow:auto;color:var(--text-primary);margin:0;white-space:pre-wrap;word-break:break-all;';
        detailPanel.appendChild(cmdEl);

        // Action buttons
        const actions = createElement('div', '', {});
        actions.style.cssText = 'display:flex;gap:var(--space-2);';

        const sendBtn = createElement('button', 'btn btn-sm btn-primary', { textContent: 'Send to Session' });
        sendBtn.addEventListener('click', () => {
            this.sendToActiveSession(snippet.command);
        });

        const editBtn = createElement('button', 'btn btn-sm btn-secondary', { textContent: 'Edit' });
        editBtn.addEventListener('click', () => {
            this._showEditor(modal, snippet, closeFn);
        });

        const deleteBtn = createElement('button', 'btn btn-sm btn-danger', { textContent: 'Delete' });
        deleteBtn.addEventListener('click', async () => {
            try {
                await window.go.api.Service.DeleteSnippet(snippet.id);
                this.snippets = this.snippets.filter((s) => s.id !== snippet.id);
                this._renderList(modal, closeFn);
                detailPanel.innerHTML = '<div class="snippet-detail-empty" style="display:flex;align-items:center;justify-content:center;flex:1;color:var(--text-tertiary);font-size:var(--text-sm);">Snippet deleted</div>';
            } catch (err) {
                this.app.notifications.error('Failed to delete: ' + err);
            }
        });

        actions.appendChild(sendBtn);
        actions.appendChild(editBtn);
        actions.appendChild(deleteBtn);
        detailPanel.appendChild(actions);
    }

    /** @private */
    _showEditor(modal, snippet, closeFn) {
        const detailPanel = modal.querySelector('.snippet-detail-panel');
        if (!detailPanel) return;
        detailPanel.innerHTML = '';

        const isNew = !snippet;
        const title = isNew ? 'New Snippet' : 'Edit Snippet';

        detailPanel.innerHTML = `
            <div style="font-weight:var(--weight-medium);font-size:var(--text-sm);">${title}</div>
            <div class="form-group" style="margin-bottom:var(--space-2);">
                <label class="form-label">Name</label>
                <input type="text" class="form-input snippet-ed-name" value="${isNew ? '' : escapeHtml(snippet.name)}" />
            </div>
            <div class="form-group" style="margin-bottom:var(--space-2);">
                <label class="form-label">Description</label>
                <input type="text" class="form-input snippet-ed-desc" value="${isNew ? '' : escapeHtml(snippet.description || '')}" />
            </div>
            <div class="form-group" style="flex:1;display:flex;flex-direction:column;">
                <label class="form-label">Command</label>
                <textarea class="form-input snippet-ed-cmd" style="flex:1;font-family:var(--font-mono);font-size:var(--text-sm);resize:none;">${isNew ? '' : escapeHtml(snippet.command)}</textarea>
            </div>
            <div class="form-group" style="margin-bottom:var(--space-2);">
                <label class="form-label">Folder</label>
                <input type="text" class="form-input snippet-ed-folder" value="${isNew ? '' : escapeHtml(snippet.folder || '')}" placeholder="e.g. Networking, Debugging" />
            </div>
            <div style="display:flex;gap:var(--space-2);">
                <button class="btn btn-sm btn-primary snippet-save-btn">Save</button>
                <button class="btn btn-sm snippet-cancel-btn">Cancel</button>
            </div>
        `;

        detailPanel.querySelector('.snippet-save-btn').addEventListener('click', async () => {
            const name = detailPanel.querySelector('.snippet-ed-name').value.trim();
            const command = detailPanel.querySelector('.snippet-ed-cmd').value;
            const description = detailPanel.querySelector('.snippet-ed-desc').value.trim();
            const folder = detailPanel.querySelector('.snippet-ed-folder').value.trim();

            if (!name) {
                this.app.notifications.error('Name is required');
                return;
            }
            if (!command) {
                this.app.notifications.error('Command is required');
                return;
            }

            try {
                const data = {
                    id: isNew ? '' : snippet.id,
                    name,
                    command,
                    description,
                    folder,
                    tags: isNew ? [] : (snippet.tags || []),
                };

                let saved;
                if (isNew) {
                    saved = await window.go.api.Service.CreateSnippet(data);
                    this.snippets.push(saved);
                } else {
                    saved = await window.go.api.Service.UpdateSnippet(data);
                    const idx = this.snippets.findIndex((s) => s.id === saved.id);
                    if (idx !== -1) this.snippets[idx] = saved;
                }

                this._renderList(modal, closeFn);
                this._showDetail(modal, saved, closeFn);
                this.app.notifications.info(isNew ? 'Snippet created' : 'Snippet updated');
            } catch (err) {
                this.app.notifications.error('Failed to save snippet: ' + err);
            }
        });

        detailPanel.querySelector('.snippet-cancel-btn').addEventListener('click', () => {
            if (snippet) {
                this._showDetail(modal, snippet, closeFn);
            } else {
                detailPanel.innerHTML = '<div class="snippet-detail-empty" style="display:flex;align-items:center;justify-content:center;flex:1;color:var(--text-tertiary);font-size:var(--text-sm);">Select a snippet or create a new one</div>';
            }
        });
    }
}

window.NexusTerminal = window.NexusTerminal || {};
window.NexusTerminal.SnippetLibrary = SnippetLibrary;

})();