use crate::{cursor, init, reindex_selection, task, update, Msg, State};

use crate::{
    cursor, init, reindex_selection, repo_got_change_diffs, task, update, Msg,
    State,
};

use std::collections::BTreeSet;

use std::collections::{BTreeMap, BTreeSet};

    let change_hash = |bytes: &[u8]| {
        let mut hasher = pijul::pristine::Hasher::default();
        hasher.update(bytes);
        hasher.finish()
    };

/// When a repo loads a change diff, it should only be used if the same change
/// is still selected
#[test(tokio::test)]
async fn test_repo_got_change_diffs() {
    let TestState {
        mut state,
        tasks: _tasks,
        fs_watch_task: _,
        id: _,
        repo: _,
    } = setup_state().await;
    let change_hash_0 = change_hash(&[0]);
    let change_hash_1 = change_hash(&[1]);
    // _________________________________________________________________________
    // Case: nothing is selected
    assert!(state.cursor.selection.is_none());
    let diffs = BTreeMap::from_iter([]);
    let task = repo_got_change_diffs(&mut state, change_hash_0, diffs);
    assert!(task.is_none());
    assert!(state.cursor.selection.is_none());
    // _________________________________________________________________________
    // Case: selection is changed
    state.cursor.selection = Some(cursor::Selection::LogChange {
        ix: 0,
        hash: change_hash_0,
        message: "".to_string(),
        diffs: None,
        file: None,
    });
    let diffs = BTreeMap::from_iter([]);
    let task = repo_got_change_diffs(&mut state, change_hash_1, diffs);
    assert!(task.is_none());
    assert!(state.cursor.selection.is_some());
    assert_matches!(
        state.cursor.selection.as_ref().unwrap(),
        cursor::Selection::LogChange { diffs: None, .. }
    );
    // _________________________________________________________________________
    // Case: selection is still the same
    state.cursor.selection = Some(cursor::Selection::LogChange {
        ix: 0,
        hash: change_hash_1,
        message: "".to_string(),
        diffs: None,
        file: None,
    });
    let diffs = BTreeMap::from_iter([]);
    let task = repo_got_change_diffs(&mut state, change_hash_1, diffs);
    assert!(task.is_none());
    assert!(state.cursor.selection.is_some());
    assert_matches!(
        state.cursor.selection.as_ref().unwrap(),
        cursor::Selection::LogChange { diffs: Some(_), .. }
    );
}

}
fn change_hash(bytes: &[u8]) -> pijul::Hash {
    let mut hasher = pijul::pristine::Hasher::default();
    hasher.update(bytes);
    hasher.finish()

                    // the file for past
                    // changes

                    // the file for past changes