//! Opening a native file that lost something (a damaged image): the session says so, with the
//! reason, and the file still opens.

use figcraft_doc::Document;
use serde_json::json;

use crate::Session;

/// A 1×1 PNG.
const PNG: [u8; 67] = [
    0x89, 0x50, 0x4e, 0x47, 0x0d, 0x0a, 0x1a, 0x0a, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x48, 0x44, 0x52, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00, 0x00, 0x01,
    0x08, 0x06, 0x00, 0x00, 0x00, 0x1f, 0x15, 0xc4, 0x89, 0x00, 0x00, 0x00, 0x0d, 0x49, 0x44, 0x41, 0x54, 0x78, 0x9c, 0x63, 0x60, 0x00, 0x00, 0x02,
    0x00, 0x00, 0x01, 0xe2, 0x21, 0xbc, 0x33, 0x00, 0x00, 0x00, 0x00, 0x49, 0x45, 0x4e, 0x44, 0xae, 0x42, 0x60, 0x82,
];

fn file(name: &str, damage: bool) -> std::path::PathBuf {
    let dir = std::env::temp_dir().join(format!("figcraft-open-issues-{}-{name}", std::process::id()));
    std::fs::create_dir_all(&dir).unwrap();
    let mut d = Document::new("Pics");
    figcraft_format::add_image(&mut d, PNG.to_vec()).unwrap();
    let mut bytes = figcraft_format::save_bytes(&d, None).unwrap();
    if damage {
        // Images are stored as they are: change one byte of the PNG, not its checksum.
        let at = bytes.windows(PNG.len()).position(|w| w == PNG).unwrap();
        bytes[at + 30] ^= 0xff;
    }
    let path = dir.join("pics.figcraft");
    std::fs::write(&path, bytes).unwrap();
    path
}

#[test]
fn a_file_with_a_damaged_image_opens_and_says_what_was_lost() {
    let path = file("damaged", true);
    let mut s = Session::new();
    let r = s.execute("file.open", &json!({"path": path.to_string_lossy()})).unwrap();
    assert!(r["repairs"].as_array().is_some_and(|a| a.len() == 1), "{r}");
    let m = s.message.take().expect("the session says so");
    assert!(m.starts_with("pics: image ") && m.contains("couldn't be read") && m.contains("drops it"), "{m}");
    let _ = std::fs::remove_dir_all(path.parent().unwrap());
}

#[test]
fn an_intact_file_opens_without_a_message() {
    let path = file("intact", false);
    let mut s = Session::new();
    let r = s.execute("file.open", &json!({"path": path.to_string_lossy()})).unwrap();
    assert!(r["repairs"].as_array().is_some_and(Vec::is_empty), "{r}");
    assert!(s.message.is_none());
    let _ = std::fs::remove_dir_all(path.parent().unwrap());
}