use iris::prelude::*;

fn editor(text: &str, mode: EditMode) -> (TextEdit, TextData) {
    let view = TextView::new(TextBuffer::new(text), TextAttrs::default(), None);
    (TextEdit::new(view, mode), TextData::default())
}

fn press(edit: &mut TextEditCtx<'_>, x: f32) {
    edit.select(vec2(x, 10.0), vec2(400.0, 200.0), false, false);
}

#[test]
fn pressing_an_empty_field_places_input() {
    let (mut text, mut data) = editor("", EditMode::SingleLine);
    let mut edit = TextEditCtx {
        text: &mut text,
        data: &mut data,
    };

    press(&mut edit, 40.0);
    edit.insert("hello");

    assert_eq!(edit.text.content(), "hello");
}

#[test]
fn preedit_replaces_the_previous_composition() {
    let (mut text, mut data) = editor("", EditMode::SingleLine);
    let mut edit = TextEditCtx {
        text: &mut text,
        data: &mut data,
    };

    press(&mut edit, 0.0);
    edit.replace(0, "に");
    edit.replace(1, "日本");

    assert_eq!(edit.text.content(), "日本");
}

#[test]
fn backspace_respects_utf8_boundaries() {
    let (mut text, mut data) = editor("aé", EditMode::SingleLine);
    let mut edit = TextEditCtx {
        text: &mut text,
        data: &mut data,
    };

    press(&mut edit, f32::MAX);
    edit.backspace(false);

    assert_eq!(edit.text.content(), "a");
}

#[test]
fn typing_replaces_the_selection() {
    let (mut text, mut data) = editor("hello", EditMode::SingleLine);
    let mut edit = TextEditCtx {
        text: &mut text,
        data: &mut data,
    };

    edit.select_all();
    edit.insert("goodbye");

    assert_eq!(edit.text.content(), "goodbye");
}