// ── tools-toggle.js ─────────────────────────
// Tools toggle popup: category-based enable/disable of server-side tools.
// Categories expand to show individual tool toggles.
// State persisted in localStorage, sent as disabled_tools[] in completion requests.

'use strict';

const ToolsToggle = (() => {
    const STORAGE_KEY = 'cs-disabled-tools';

    // Category display config
    const CATEGORY_META = {
        search:    { label: 'Web Search',      icon: '🔍' },
        knowledge: { label: 'Knowledge Bases', icon: '📚' },
        notes:     { label: 'Notes',           icon: '📝' },
        utilities: { label: 'Utilities',       icon: '🧮' },
        workspace: { label: 'Workspace',       icon: '🗂️' },
        context:   { label: 'Context',         icon: '📎' },
        memory:    { label: 'Memory',          icon: '🧠' },
        browser:   { label: 'Extensions',      icon: '🧩' },
    };

    // Cached tool manifest from GET /api/v1/tools
    let _tools = [];      // [{name, display_name, description, category}]
    let _categories = {};  // {category: [{name, displayName}]}
    let _disabled = new Set();
    let _expanded = new Set();  // which categories are expanded

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

    /** Initialize: load disabled set from storage, fetch tool manifest. */
    async function init() {
        _loadDisabled();
        try {
            const resp = await API.getTools();
            _tools = resp.tools || [];
            _buildCategories();
            _render();
            _show();
        } catch (e) {
            console.warn('Tools toggle: failed to load tools', e);
        }
        _wireEvents();
    }

    /** Returns array of disabled tool names for the completion request. */
    function getDisabledTools() {
        return [..._disabled];
    }

    /** Refresh tool list (e.g. after browser extension connects). */
    async function refresh() {
        try {
            const resp = await API.getTools();
            _tools = resp.tools || [];
            _buildCategories();
            _render();
        } catch (e) { /* silent */ }
    }

    // ── Internal ────────────────────────────

    function _loadDisabled() {
        try {
            const raw = localStorage.getItem(STORAGE_KEY);
            _disabled = raw ? new Set(JSON.parse(raw)) : new Set();
        } catch { _disabled = new Set(); }
    }

    function _saveDisabled() {
        localStorage.setItem(STORAGE_KEY, JSON.stringify([..._disabled]));
        _updateBtnState();
    }

    function _buildCategories() {
        _categories = {};
        for (const t of _tools) {
            const cat = t.category || 'other';
            if (!_categories[cat]) _categories[cat] = [];
            _categories[cat].push({
                name: t.name,
                displayName: t.display_name || t.name,
            });
        }
    }

    /** Returns 'all' | 'none' | 'partial' for a category's enabled state. */
    function _categoryState(cat) {
        const tools = _categories[cat] || [];
        if (tools.length === 0) return 'none';
        const enabledCount = tools.filter(t => !_disabled.has(t.name)).length;
        if (enabledCount === tools.length) return 'all';
        if (enabledCount === 0) return 'none';
        return 'partial';
    }

    function _toggleCategory(cat) {
        const tools = _categories[cat] || [];
        const state = _categoryState(cat);
        if (state === 'all') {
            // All on → all off
            tools.forEach(t => _disabled.add(t.name));
        } else {
            // Partial or none → all on
            tools.forEach(t => _disabled.delete(t.name));
        }
        _saveDisabled();
        _render();
    }

    function _toggleTool(name) {
        if (_disabled.has(name)) {
            _disabled.delete(name);
        } else {
            _disabled.add(name);
        }
        _saveDisabled();
        _render();
    }

    function _toggleExpand(cat) {
        if (_expanded.has(cat)) {
            _expanded.delete(cat);
        } else {
            _expanded.add(cat);
        }
        _render();
    }

    function _show() {
        const wrap = document.querySelector('.tools-toggle-wrap');
        if (wrap && _tools.length > 0) {
            wrap.style.display = '';
            _updateBtnState();
        }
    }

    function _updateBtnState() {
        const btn = document.getElementById('toolsToggleBtn');
        if (!btn) return;
        btn.classList.toggle('has-disabled', _disabled.size > 0);
        const count = _disabled.size;
        btn.title = count > 0 ? `Tools (${count} disabled)` : 'Tools';
    }

    function _render() {
        const popup = document.getElementById('toolsPopup');
        if (!popup) return;

        const cats = Object.keys(_categories);
        const order = Object.keys(CATEGORY_META);
        cats.sort((a, b) => {
            const ai = order.indexOf(a), bi = order.indexOf(b);
            return (ai === -1 ? 999 : ai) - (bi === -1 ? 999 : bi);
        });

        let html = '';
        for (const cat of cats) {
            const meta = CATEGORY_META[cat] || { label: cat, icon: '🔧' };
            const state = _categoryState(cat);
            const tools = _categories[cat];
            const expanded = _expanded.has(cat);
            const switchClass = state === 'all' ? 'on' : state === 'partial' ? 'on partial' : '';
            const chevron = tools.length > 1
                ? `<span class="tools-popup-expand ${expanded ? 'open' : ''}" data-expand="${cat}">›</span>`
                : '';
            const labelExpand = tools.length > 1 ? ` data-expand="${cat}"` : '';

            html += `<div class="tools-popup-category" data-category="${cat}">
                <span class="tools-popup-switch ${switchClass}" data-switch="${cat}"><span class="tools-popup-switch-knob"></span></span>
                <span class="tools-popup-label"${labelExpand}>${meta.icon} ${meta.label}</span>
                ${chevron}
            </div>`;

            // Expanded children
            if (expanded && tools.length > 1) {
                for (const t of tools) {
                    const on = !_disabled.has(t.name);
                    html += `<div class="tools-popup-tool" data-tool="${t.name}">
                        <span class="tools-popup-switch ${on ? 'on' : ''}" data-tool-switch="${t.name}"><span class="tools-popup-switch-knob"></span></span>
                        <span class="tools-popup-label">${t.displayName}</span>
                    </div>`;
                }
            }
        }

        popup.innerHTML = html;
    }

    function _wireEvents() {
        const btn = document.getElementById('toolsToggleBtn');
        const popup = document.getElementById('toolsPopup');
        if (!btn || !popup) return;

        btn.addEventListener('click', (e) => {
            e.stopPropagation();
            popup.classList.toggle('open');
        });

        popup.addEventListener('click', (e) => {
            e.stopPropagation();

            // Toggle switch on category row
            const catSwitch = e.target.closest('[data-switch]');
            if (catSwitch) {
                _toggleCategory(catSwitch.dataset.switch);
                return;
            }

            // Toggle switch on individual tool row
            const toolSwitch = e.target.closest('[data-tool-switch]');
            if (toolSwitch) {
                _toggleTool(toolSwitch.dataset.toolSwitch);
                return;
            }

            // Expand/collapse: chevron or label click on multi-tool categories
            const expander = e.target.closest('[data-expand]');
            if (expander) {
                _toggleExpand(expander.dataset.expand);
                return;
            }

            // Individual tool label (no expand, just toggle)
            const toolRow = e.target.closest('.tools-popup-tool');
            if (toolRow) {
                _toggleTool(toolRow.dataset.tool);
                return;
            }

            // Single-tool category label click (no chevron) — toggle
            const catRow = e.target.closest('.tools-popup-category');
            if (catRow) {
                _toggleCategory(catRow.dataset.category);
                return;
            }
        });

        // Close on outside click
        document.addEventListener('click', () => popup.classList.remove('open'));
    }

    return { init, getDisabledTools, refresh };
})();