//! Byte cursor bridge tests, including oriented Unicode selections.

use egui::text::{CCursor, CCursorRange};
use egui::text_edit::TextEditState;
use notescraft_editor::editor::{byte_cursor_range, set_byte_cursor_range};

#[test]
fn unicode_ranges_round_trip_without_reversing_primary_and_anchor() {
    let ctx = egui::Context::default();
    let id = egui::Id::new("cursor-bridge");
    let text = "aé🦀z";
    for range in [(0, 0), (1, 7), (7, 1), (3, 8), (8, 8)] {
        set_byte_cursor_range(&ctx, id, text, range).expect("valid byte range");
        assert_eq!(byte_cursor_range(&ctx, id, text), range);
    }
}

#[test]
fn invalid_ranges_leave_stored_selection_unchanged() {
    let ctx = egui::Context::default();
    let id = egui::Id::new("invalid-cursor");
    let text = "aé🦀z";
    set_byte_cursor_range(&ctx, id, text, (7, 1)).expect("valid byte range");
    for range in [(2, 0), (0, 2), (4, 7), (7, 6), (9, 0), (0, usize::MAX)] {
        assert!(set_byte_cursor_range(&ctx, id, text, range).is_err());
        assert_eq!(byte_cursor_range(&ctx, id, text), (7, 1));
    }
}

#[test]
fn missing_or_stale_egui_cursors_return_valid_byte_boundaries() {
    let ctx = egui::Context::default();
    let id = egui::Id::new("stale-cursor");
    assert_eq!(byte_cursor_range(&ctx, id, "é"), (0, 0));
    let mut state = TextEditState::default();
    state.cursor.set_char_range(Some(CCursorRange::two(CCursor::new(1), CCursor::new(usize::MAX))));
    state.store(&ctx, id);
    assert_eq!(byte_cursor_range(&ctx, id, "é🦀"), (6, 2));
}