// src/components/utils/text.rs

use unicode_width::UnicodeWidthStr;
use unicode_segmentation::UnicodeSegmentation;

/// Truncates a string to a maximum width, adding an ellipsis if truncated.
/// Considers unicode character widths.
pub fn truncate_string(s: &str, max_width: usize) -> String {
    if UnicodeWidthStr::width(s) <= max_width {
        s.to_string()
    } else {
        let ellipsis = "…";
        let ellipsis_width = UnicodeWidthStr::width(ellipsis);
        let mut truncated_width = 0;
        let mut end_byte_index = 0;

        // Iterate over graphemes to handle multi-byte characters correctly
        for (i, g) in s.grapheme_indices(true) {
            let char_width = UnicodeWidthStr::width(g);
            if truncated_width + char_width + ellipsis_width > max_width {
                break;
            }
            truncated_width += char_width;
            end_byte_index = i + g.len();
        }

        format!("{}{}", &s[..end_byte_index], ellipsis)
    }
}