Add model selector TUI and update session management

packages/coding-agent/src/tui/model-selector.ts

@@ -0,0 +1,188 @@
+import { getModels, getProviders, type Model } from "@mariozechner/pi-ai";
+import { Container, Input, Spacer, Text } from "@mariozechner/pi-tui";
+import chalk from "chalk";
+
+interface ModelItem {
+	provider: string;
+	id: string;
+	model: Model<any>;
+}
+
+/**
+ * Component that renders a model selector with search
+ */
+export class ModelSelectorComponent extends Container {
+	private searchInput: Input;
+	private listContainer: Container;
+	private allModels: ModelItem[] = [];
+	private filteredModels: ModelItem[] = [];
+	private selectedIndex: number = 0;
+	private currentModel: Model<any>;
+	private onSelectCallback: (model: Model<any>) => void;
+	private onCancelCallback: () => void;
+
+	constructor(currentModel: Model<any>, onSelect: (model: Model<any>) => void, onCancel: () => void) {
+		super();
+
+		this.currentModel = currentModel;
+		this.onSelectCallback = onSelect;
+		this.onCancelCallback = onCancel;
+
+		// Load all models
+		this.loadModels();
+
+		// Add top border
+		this.addChild(new Text(chalk.blue("─".repeat(80)), 0, 0));
+		this.addChild(new Spacer(1));
+
+		// Create search input
+		this.searchInput = new Input();
+		this.searchInput.onSubmit = () => {
+			// Enter on search input selects the first filtered item
+			if (this.filteredModels[this.selectedIndex]) {
+				this.handleSelect(this.filteredModels[this.selectedIndex].model);
+			}
+		};
+		this.addChild(this.searchInput);
+
+		this.addChild(new Spacer(1));
+
+		// Create list container
+		this.listContainer = new Container();
+		this.addChild(this.listContainer);
+
+		this.addChild(new Spacer(1));
+
+		// Add bottom border
+		this.addChild(new Text(chalk.blue("─".repeat(80)), 0, 0));
+
+		// Initial render
+		this.updateList();
+	}
+
+	private loadModels(): void {
+		const models: ModelItem[] = [];
+		const providers = getProviders();
+
+		for (const provider of providers) {
+			const providerModels = getModels(provider as any);
+			for (const model of providerModels) {
+				models.push({ provider, id: model.id, model });
+			}
+		}
+
+		// Sort: current model first, then by provider
+		models.sort((a, b) => {
+			const aIsCurrent = this.currentModel?.id === a.model.id;
+			const bIsCurrent = this.currentModel?.id === b.model.id;
+			if (aIsCurrent && !bIsCurrent) return -1;
+			if (!aIsCurrent && bIsCurrent) return 1;
+			return a.provider.localeCompare(b.provider);
+		});
+
+		this.allModels = models;
+		this.filteredModels = models;
+	}
+
+	private filterModels(query: string): void {
+		if (!query.trim()) {
+			this.filteredModels = this.allModels;
+		} else {
+			const searchTokens = query
+				.toLowerCase()
+				.split(/\s+/)
+				.filter((t) => t);
+			this.filteredModels = this.allModels.filter(({ provider, id, model }) => {
+				const searchText = `${provider} ${id} ${model.name}`.toLowerCase();
+				return searchTokens.every((token) => searchText.includes(token));
+			});
+		}
+
+		this.selectedIndex = Math.min(this.selectedIndex, Math.max(0, this.filteredModels.length - 1));
+		this.updateList();
+	}
+
+	private updateList(): void {
+		this.listContainer.clear();
+
+		const maxVisible = 10;
+		const startIndex = Math.max(
+			0,
+			Math.min(this.selectedIndex - Math.floor(maxVisible / 2), this.filteredModels.length - maxVisible),
+		);
+		const endIndex = Math.min(startIndex + maxVisible, this.filteredModels.length);
+
+		// Show visible slice of filtered models
+		for (let i = startIndex; i < endIndex; i++) {
+			const item = this.filteredModels[i];
+			if (!item) continue;
+
+			const isSelected = i === this.selectedIndex;
+			const isCurrent = this.currentModel?.id === item.model.id;
+
+			let line = "";
+			if (isSelected) {
+				const prefix = chalk.blue("→ ");
+				const modelText = `${item.id}`;
+				const providerBadge = chalk.gray(`[${item.provider}]`);
+				const checkmark = isCurrent ? chalk.green(" ✓") : "";
+				line = prefix + chalk.blue(modelText) + " " + providerBadge + checkmark;
+			} else {
+				const modelText = `  ${item.id}`;
+				const providerBadge = chalk.gray(`[${item.provider}]`);
+				const checkmark = isCurrent ? chalk.green(" ✓") : "";
+				line = modelText + " " + providerBadge + checkmark;
+			}
+
+			this.listContainer.addChild(new Text(line, 0, 0));
+		}
+
+		// Add scroll indicator if needed
+		if (startIndex > 0 || endIndex < this.filteredModels.length) {
+			const scrollInfo = chalk.gray(`  (${this.selectedIndex + 1}/${this.filteredModels.length})`);
+			this.listContainer.addChild(new Text(scrollInfo, 0, 0));
+		}
+
+		// Show "no results" if empty
+		if (this.filteredModels.length === 0) {
+			this.listContainer.addChild(new Text(chalk.gray("  No matching models"), 0, 0));
+		}
+	}
+
+	handleInput(keyData: string): void {
+		// Up arrow
+		if (keyData === "\x1b[A") {
+			this.selectedIndex = Math.max(0, this.selectedIndex - 1);
+			this.updateList();
+		}
+		// Down arrow
+		else if (keyData === "\x1b[B") {
+			this.selectedIndex = Math.min(this.filteredModels.length - 1, this.selectedIndex + 1);
+			this.updateList();
+		}
+		// Enter
+		else if (keyData === "\r") {
+			const selectedModel = this.filteredModels[this.selectedIndex];
+			if (selectedModel) {
+				this.handleSelect(selectedModel.model);
+			}
+		}
+		// Escape
+		else if (keyData === "\x1b") {
+			this.onCancelCallback();
+		}
+		// Pass everything else to search input
+		else {
+			this.searchInput.handleInput(keyData);
+			this.filterModels(this.searchInput.getValue());
+		}
+	}
+
+	private handleSelect(model: Model<any>): void {
+		this.onSelectCallback(model);
+	}
+
+	getSearchInput(): Input {
+		return this.searchInput;
+	}
+}