// ==========================================
// Chat Switchboard — ModelSelector Component
// ==========================================
// v0.25.0: Extracted from ui-core.js.
// Grouped dropdown: personas (global, team, personal), models, BYOK.
// Pattern: Go template partial (model-selector.html) + JS factory (this file).
//
// Usage:
//   const sel = ModelSelector.create({ id: 'main', onChange: (id, label) => { ... } });
//   sel.setModels(App.models);
//   sel.select(modelId);
//   sel.getSelected(); // → current model ID
//   sel.destroy();

const ModelSelector = {
    ...createComponentRegistry('ModelSelector'),

    create(opts) {
        const pfx = opts.id || '';
        const instance = componentMixin({
            id: pfx,
            dropdownEl: document.getElementById(pfx + 'modelDropdown'),
            btnEl:      document.getElementById(pfx + 'modelDropdownBtn'),
            labelEl:    document.getElementById(pfx + 'modelDropdownLabel'),
            menuEl:     document.getElementById(pfx + 'modelDropdownMenu'),
            capsEl:     document.getElementById(pfx + 'modelCaps'),
            onChange:    opts.onChange || null,
            _value:     '',
            _models:    [],

            // ── Selection ───────────────────────

            getSelected() { return this._value; },

            select(id, label) {
                this._value = id;
                if (this.labelEl) this.labelEl.textContent = label || id || 'Select a model';
                // Highlight
                if (this.menuEl) {
                    this.menuEl.querySelectorAll('.model-dropdown-item').forEach(el => {
                        el.classList.toggle('selected', el.dataset.value === id);
                    });
                }
                this._updateCaps();
                if (this.onChange) this.onChange(id, label);
            },

            // ── Model list ──────────────────────

            setModels(models) {
                this._models = models || [];
                this._rebuild();
            },

            _rebuild() {
                if (!this.menuEl) return;
                this.menuEl.innerHTML = '';

                if (this._models.length === 0) {
                    this.menuEl.innerHTML = '<div class="model-dropdown-item" style="color:var(--text-3);cursor:default">No models loaded</div>';
                    this.select('', 'No models loaded');
                    return;
                }

                const globalPersonas   = this._models.filter(m => m.isPersona && m.personaScope === 'global');
                const teamPersonas     = this._models.filter(m => m.isPersona && m.personaScope === 'team');
                const personalPersonas = this._models.filter(m => m.isPersona && m.personaScope === 'personal');
                const models           = this._models.filter(m => !m.isPersona && !m.hidden);

                const addGroup = (label, items) => {
                    if (items.length === 0) return;
                    const hdr = document.createElement('div');
                    hdr.className = 'model-dropdown-group';
                    hdr.textContent = label;
                    this.menuEl.appendChild(hdr);
                    items.forEach(m => this.menuEl.appendChild(this._createItem(m)));
                };

                addGroup('\u26A1 Personas', globalPersonas);

                // Group team personas by team name
                const teamGroups = {};
                teamPersonas.forEach(m => {
                    const tn = m.personaTeamName || 'Team';
                    (teamGroups[tn] = teamGroups[tn] || []).push(m);
                });
                Object.keys(teamGroups).sort().forEach(tn => {
                    addGroup('\uD83D\uDC65 ' + tn, teamGroups[tn]);
                });

                addGroup('\uD83D\uDD27 My Personas', personalPersonas);
                addGroup('Models', models.filter(m => m.source !== 'personal'));
                addGroup('\uD83D\uDD11 My Providers', models.filter(m => m.source === 'personal'));
            },

            _createItem(m) {
                const self = this;
                const div = document.createElement('div');
                div.className = 'model-dropdown-item';
                div.dataset.value = m.id;
                const avatar = m.personaAvatar ? '<img src="' + esc(m.personaAvatar) + '" class="dropdown-avatar" alt="">' : '';
                const handle = m.isPersona && m.personaHandle ? '<span class="item-handle">@' + esc(m.personaHandle) + '</span>' : '';
                const teamBadge = m.source === 'team' && m.teamName ? '<span class="badge-team" style="font-size:9px;padding:0 4px">\uD83D\uDC65 ' + esc(m.teamName) + '</span>' : '';
                const provider = m.provider ? '<span class="item-provider">' + esc(m.provider) + '</span>' : '';
                div.innerHTML = avatar + '<span class="item-label">' + esc(m.name || m.id) + handle + '</span>' + teamBadge + provider;
                div.addEventListener('click', () => {
                    self.select(m.id, (m.name || m.id) + (m.provider ? ' (' + m.provider + ')' : ''));
                    self.close();
                });
                return div;
            },

            // ── Restore selection ───────────────

            /**
             * Restore selection from a preferred ID, falling back through
             * admin default → first visible.
             */
            restore(preferredId, adminDefault) {
                const visible = this._models.filter(m => !m.hidden);
                if (visible.length === 0) { this.select('', 'No visible models'); return; }

                const byId = (id) => visible.find(m => m.id === id || m.baseModelId === id);
                const match = byId(preferredId) || byId(adminDefault) || visible[0];
                this.select(match.id, (match.name || match.id) + (match.provider ? ' (' + match.provider + ')' : ''));
            },

            // ── Dropdown toggle ─────────────────

            open() { if (this.menuEl) this.menuEl.classList.add('open'); },
            close() { if (this.menuEl) this.menuEl.classList.remove('open'); },
            toggle() { if (this.menuEl) this.menuEl.classList.toggle('open'); },

            // ── Capability badges ───────────────

            _updateCaps() {
                if (!this.capsEl) return;
                if (!this._value) { this.capsEl.innerHTML = ''; return; }
                const m = this._models.find(m => m.id === this._value);
                const caps = m?.capabilities;
                if (!caps || Object.keys(caps).length === 0) { this.capsEl.innerHTML = ''; return; }
                // Use global renderCapBadges if available (from ui-core.js)
                if (typeof renderCapBadges === 'function') {
                    this.capsEl.innerHTML = renderCapBadges(caps);
                }
            },

            getSelectedCaps() {
                const m = this._models.find(m => m.id === this._value);
                return m?.capabilities || {};
            },

            // ── Event wiring ────────────────────

            bind() {
                this._on(this.btnEl, 'click', (e) => {
                    e.stopPropagation();
                    this.toggle();
                });
                this._on(document, 'click', (e) => {
                    if (!e.target.closest('#' + pfx + 'modelDropdown')) this.close();
                });
            },
        }, ModelSelector);

        ModelSelector._register(pfx, instance);
        return instance;
    },
};