use insta::assert_snapshot;
use std::path::PathBuf;

use crate::terminal_pane::PositionAndSize;
use crate::tests::fakes::FakeInputOutput;
use crate::tests::utils::commands::{COMMAND_TOGGLE, QUIT};
use crate::tests::utils::get_output_frame_snapshots;
use crate::{start, Opt};

fn get_fake_os_input(fake_win_size: &PositionAndSize) -> FakeInputOutput {
    FakeInputOutput::new(fake_win_size.clone())
}

#[test]
pub fn accepts_basic_layout() {
    let fake_win_size = PositionAndSize {
        columns: 121,
        rows: 20,
        x: 0,
        y: 0,
    };
    let mut fake_input_output = get_fake_os_input(&fake_win_size);
    fake_input_output.add_terminal_input(&[&COMMAND_TOGGLE, &COMMAND_TOGGLE, &QUIT]);
    let mut opts = Opt::default();
    opts.layout = Some(PathBuf::from(
        "src/tests/fixtures/layouts/three-panes-with-nesting.yaml",
    ));

    start(Box::new(fake_input_output.clone()), opts);
    let output_frames = fake_input_output
        .stdout_writer
        .output_frames
        .lock()
        .unwrap();
    let snapshots = get_output_frame_snapshots(&output_frames, &fake_win_size);

    let snapshot_count = snapshots.len();
    let first_snapshot = snapshots.get(0).unwrap();
    let next_to_last_snapshot = snapshots.get(snapshot_count - 2).unwrap();
    let last_snapshot = snapshots.last().unwrap();
    // here we only test the first, next to last and last snapshot because there's a race condition
    // with the other snapshots. Namely all the terminals are created asynchronously and read in an
    // async task, so we have no way to guarantee the order in which their bytes will be read, and
    // it doesn't really matter in this context. We just want to see that the layout is initially
    // created properly and that in the end it's populated properly with its content
    //
    // we read the next to last as well as the last, because the last includes the "Bye from
    // Mosaic" message, and we also want to make sure things are fine before that
    assert_snapshot!(first_snapshot);
    assert_snapshot!(next_to_last_snapshot);
    assert_snapshot!(last_snapshot);
}

#[test]
#[should_panic(expected = "The total percent for each part should equal 100.")]
pub fn should_throw_for_more_than_100_percent_total() {
    let fake_win_size = PositionAndSize {
        columns: 121,
        rows: 20,
        x: 0,
        y: 0,
    };
    let mut fake_input_output = get_fake_os_input(&fake_win_size);
    fake_input_output.add_terminal_input(&[&QUIT]);

    let mut opts = Opt::default();
    opts.layout = Some(PathBuf::from(
        "src/tests/fixtures/layouts/parts-total-more-than-100-percent.yaml",
    ));

    start(Box::new(fake_input_output.clone()), opts);
}

#[test]
#[should_panic(expected = "The total percent for each part should equal 100.")]
pub fn should_throw_for_less_than_100_percent_total() {
    let fake_win_size = PositionAndSize {
        columns: 121,
        rows: 20,
        x: 0,
        y: 0,
    };
    let mut fake_input_output = get_fake_os_input(&fake_win_size);
    fake_input_output.add_terminal_input(&[&QUIT]);

    let mut opts = Opt::default();
    opts.layout = Some(PathBuf::from(
        "src/tests/fixtures/layouts/parts-total-less-than-100-percent.yaml",
    ));

    start(Box::new(fake_input_output.clone()), opts);
}