magi-code 0.105.1

//! Stable file references; display-only projection leaves session/provider text intact.
use std::{borrow::Cow, path::Path};

pub(super) const IMAGE_REFERENCE_PREFIX: &str = "[View the image here: ";

pub(super) fn image_reference(path: &str) -> String {
    format!("{IMAGE_REFERENCE_PREFIX}{path}]")
}

pub(super) fn image_filename(id: u64) -> String {
    format!("clipboard-image-{id}-{}.png", uuid::Uuid::new_v4())
}

fn image_id(path: &str) -> Option<u64> {
    let path = Path::new(path);
    if !path.is_absolute() || path.parent()?.file_name()? != "tmp" {
        return None;
    }
    let name = path.file_name()?.to_str()?;
    let (id, uuid) = name
        .strip_prefix("clipboard-image-")?
        .strip_suffix(".png")?
        .split_once('-')?;
    uuid::Uuid::parse_str(uuid).ok()?;
    id.parse().ok()
}

pub(super) fn display_image_references(text: &str) -> Cow<'_, str> {
    if !text.contains(IMAGE_REFERENCE_PREFIX) {
        return Cow::Borrowed(text);
    }
    let mut display = String::with_capacity(text.len());
    let mut remaining = text;
    while let Some(start) = remaining.find(IMAGE_REFERENCE_PREFIX) {
        display.push_str(&remaining[..start]);
        let reference = &remaining[start..];
        let Some(end) = reference.find(']') else {
            display.push_str(reference);
            return Cow::Owned(display);
        };
        let path = &reference[IMAGE_REFERENCE_PREFIX.len()..end];
        if let Some(id) = image_id(path) {
            display.push_str(&format!("[Pasted Image #{id}]"));
        } else {
            display.push_str(&reference[..=end]);
        }
        remaining = &reference[end + 1..];
    }
    display.push_str(remaining);
    Cow::Owned(display)
}