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use super::TextLine;

impl TextLine {
    /// Adds a char and updates the text cursor.
    pub fn add_char(&mut self, text_cursor: &mut usize, c: char) {
        self.insert(*text_cursor, c);
        *text_cursor += 1;
    }

    /// Removes the next char if it exists.
    pub fn remove_forward(&mut self, text_cursor: usize) -> bool {
        let remove = text_cursor < self.len();
        if remove {
            self.remove(text_cursor);
        }
        remove
    }

    /// Removes the previous word if it exists.
    pub fn remove_forward_skip(&mut self, text_cursor: usize) -> bool {
        let mut end_cursor = text_cursor;
        self.skip_forward(&mut end_cursor);
        let range = text_cursor..end_cursor;
        let moved = !range.is_empty();
        if moved {
            self.remove_range(range);
        }
        moved
    }

    /// Removes the previous char if it exists and updates the text cursor.
    pub fn remove_back(&mut self, text_cursor: &mut usize) -> bool {
        let remove = *text_cursor > 0;
        if remove {
            *text_cursor -= 1;
            self.remove(*text_cursor);
        }
        remove
    }

    /// Removes the previous word if it exists and updates the text cursor.
    pub fn remove_back_skip(&mut self, text_cursor: &mut usize) -> bool {
        let end_cursor = *text_cursor;
        self.skip_back(text_cursor);
        let range = *text_cursor..end_cursor;
        let moved = !range.is_empty();
        if moved {
            self.remove_range(range);
        }
        moved
    }
}