// CLI spinner utility
export class Spinner {
    private frames = ['⠋', '⠙', '⠹', '⠸', '⠼', '⠴', '⠦', '⠧', '⠇', '⠏'];
    private interval: NodeJS.Timeout | undefined;
    private frameIndex = 0;
    private message: string;
    private isSpinning = false;

    constructor(message: string = 'Loading...') {
        this.message = message;
    }

    start(): this {
        if (this.isSpinning) return this;
        
        this.isSpinning = true;
        this.frameIndex = 0;
        
        // Hide cursor
        process.stdout.write('\x1B[?25l');
        
        this.interval = setInterval(() => {
            process.stdout.write(`\r${this.frames[this.frameIndex]} ${this.message}`);
            this.frameIndex = (this.frameIndex + 1) % this.frames.length;
        }, 80);
        
        return this;
    }

    stop(finalMessage?: string): void {
        if (!this.isSpinning) return;
        
        this.isSpinning = false;
        
        if (this.interval) {
            clearInterval(this.interval);
            this.interval = undefined;
        }
        
        // Clear line and show cursor
        process.stdout.write('\r\x1B[K\x1B[?25h');
        
        if (finalMessage) {
            console.log(finalMessage);
        }
    }

    succeed(message?: string): void {
        this.stop(`✅ ${message || this.message}`);
    }

    fail(message?: string): void {
        this.stop(`❌ ${message || this.message}`);
    }

    updateMessage(message: string): void {
        this.message = message;
    }
}