indra87g / ProgressBar

use std::io::{self, Write};

pub struct ProgressBar {
    total_size: u64,
    current_size: u64,
    bar_width: usize,
}

impl ProgressBar {
    pub fn new(total_size: u64) -> Self {
        Self {
            total_size,
            current_size: 0,
            bar_width: 40,
        }
    }
    
    pub fn update(&mut self, amount: u64) {
        self.current_size = (self.current_size + amount).min(self.total_size);
        let percentage = (self.current_size as f64 / self.total_size as f64) * 100.0;
        
        let filled_len = ((self.current_size as f64 / self.total_size as f64) * self.bar_width as f64) as usize;
        let empty_len = self.bar_width - filled_len;
        
        let filled = "█".repeat(filled_len);
        let empty = "░".repeat(empty_len);
        
        print!("\r[{}{}] {:.2}% ({}/{})", filled, empty, percentage, self.current_size, self.total_size);
        
        io::stdout().flush().unwrap();
    }
    
    pub fn finish(&self) {
        println!("\nProcess complete.")
    }
}