// Oak Video Editor - Non-Linear Video Editor
// Copyright (C) 2026 Oak Team
//
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program.  If not, see <http://www.gnu.org/licenses/>.

//! Semantic tests over `golden_timeline.json`: walk the parsed object graph
//! and assert the values Oak's C++ load task depends on.

use oakotio::{Clip, ExternalReference, MediaReference, Serializable, Timeline};

fn golden_timeline() -> Timeline {
	let text = std::fs::read_to_string(concat!(
		env!("CARGO_MANIFEST_DIR"),
		"/tests/data/golden_timeline.json"
	))
	.expect("read golden_timeline.json");
	match oakotio::from_json_string(&text).expect("parse golden_timeline.json") {
		Serializable::Timeline(t) => t,
		other => panic!("expected Timeline root, got {}", other.schema_name()),
	}
}

#[test]
fn root_timeline_fields() {
	let tl = golden_timeline();
	assert_eq!(tl.name(), "My Sequence");
	assert_eq!(tl.global_start_time(), None);
	assert_eq!(tl.tracks().children().len(), 2);
}

#[test]
fn video_track_contents() {
	let tl = golden_timeline();
	let video = &tl.tracks().children()[0];
	let track = video
		.as_track()
		.expect("first child of tracks stack is a Track");
	assert_eq!(track.kind(), "Video");
	assert_eq!(track.children().len(), 3);

	// Clip -> Gap -> Transition, in order.
	let clip = track.children()[0]
		.as_clip()
		.expect("video track child 0 is a Clip");
	assert_eq!(clip.name(), "My Sequence Clip");
	let range = clip.source_range().expect("clip has a source_range");
	assert_eq!(
		(range.duration().value(), range.duration().rate()),
		(1152.0, 24.0)
	);
	assert_eq!(
		(range.start_time().value(), range.start_time().rate()),
		(0.0, 24.0)
	);

	let gap = track.children()[1]
		.as_gap()
		.expect("video track child 1 is a Gap");
	assert_eq!(gap.name(), "My Sequence Gap");
	let grange = gap.source_range().expect("gap has a source_range");
	assert_eq!(
		(grange.duration().value(), grange.duration().rate()),
		(576.0, 24.0)
	);

	let trans = track.children()[2]
		.as_transition()
		.expect("video track child 2 is a Transition");
	assert_eq!(trans.name(), "My Sequence Transition");
	assert_eq!(
		(trans.in_offset().value(), trans.in_offset().rate()),
		(12.0, 24.0)
	);
	assert_eq!(
		(trans.out_offset().value(), trans.out_offset().rate()),
		(12.0, 24.0)
	);
	assert_eq!(trans.transition_type(), "");
}

#[test]
fn video_clip_media_reference() {
	let tl = golden_timeline();
	let clip = &tl.tracks().children()[0].as_track().unwrap().children()[0];
	let clip = clip.as_clip().unwrap();

	let reference = clip
		.media_reference()
		.expect("clip resolves a media reference");
	assert_eq!(reference.schema_name(), "ExternalReference");
	let external: &ExternalReference = match reference {
		MediaReference::ExternalReference(e) => e,
		other => panic!("expected ExternalReference, got {}", other.schema_name()),
	};
	assert_eq!(external.target_url(), "file:///tmp/My Sequence.mp4");
	let available = external.available_range().expect("available_range is set");
	assert_eq!(
		(available.duration().value(), available.duration().rate()),
		(100.0, 25.0)
	);
	assert_eq!(
		(
			available.start_time().value(),
			available.start_time().rate()
		),
		(0.0, 25.0)
	);
}

#[test]
fn audio_track_contents() {
	let tl = golden_timeline();
	let audio = &tl.tracks().children()[1];
	let track = audio
		.as_track()
		.expect("second child of tracks stack is a Track");
	assert_eq!(track.kind(), "Audio");
	assert_eq!(track.children().len(), 2);

	let clip: &Clip = track.children()[0]
		.as_clip()
		.expect("audio track child 0 is a Clip");
	assert_eq!(clip.name(), "My Sequence Audio");
	let external: &ExternalReference = match clip.media_reference().unwrap() {
		MediaReference::ExternalReference(e) => e,
		other => panic!("expected ExternalReference, got {}", other.schema_name()),
	};
	assert_eq!(external.target_url(), "file:///tmp/My Sequence.wav");
	let available = external.available_range().unwrap();
	assert_eq!(
		(available.duration().value(), available.duration().rate()),
		(0.0, 48000.0)
	);
	assert_eq!(
		(
			available.start_time().value(),
			available.start_time().rate()
		),
		(0.0, 48000.0)
	);

	let gap = track.children()[1]
		.as_gap()
		.expect("audio track child 1 is a Gap");
	assert_eq!(gap.name(), "");
	let grange = gap.source_range().unwrap();
	assert_eq!(
		(grange.duration().value(), grange.duration().rate()),
		(12.0, 1.0)
	);
	assert_eq!(
		(grange.start_time().value(), grange.start_time().rate()),
		(1152.0, 24.0)
	);
}