/**
 * Minimal terminal interface for TUI
 */
export interface Terminal {
	// Start the terminal with input and resize handlers
	start(onInput: (data: string) => void, onResize: () => void): void;

	// Stop the terminal and restore state
	stop(): void;

	// Write output to terminal
	write(data: string): void;

	// Get terminal dimensions
	get columns(): number;
	get rows(): number;
}

/**
 * Real terminal using process.stdin/stdout
 */
export class ProcessTerminal implements Terminal {
	private wasRaw = false;
	private inputHandler?: (data: string) => void;
	private resizeHandler?: () => void;

	start(onInput: (data: string) => void, onResize: () => void): void {
		this.inputHandler = onInput;
		this.resizeHandler = onResize;

		// Save previous state and enable raw mode
		this.wasRaw = process.stdin.isRaw || false;
		if (process.stdin.setRawMode) {
			process.stdin.setRawMode(true);
		}
		process.stdin.setEncoding("utf8");
		process.stdin.resume();

		// Set up event handlers
		process.stdin.on("data", this.inputHandler);
		process.stdout.on("resize", this.resizeHandler);
	}

	stop(): void {
		// Remove event handlers
		if (this.inputHandler) {
			process.stdin.removeListener("data", this.inputHandler);
			this.inputHandler = undefined;
		}
		if (this.resizeHandler) {
			process.stdout.removeListener("resize", this.resizeHandler);
			this.resizeHandler = undefined;
		}

		// Restore raw mode state
		if (process.stdin.setRawMode) {
			process.stdin.setRawMode(this.wasRaw);
		}
	}

	write(data: string): void {
		process.stdout.write(data);
	}

	get columns(): number {
		return process.stdout.columns || 80;
	}

	get rows(): number {
		return process.stdout.rows || 24;
	}
}