// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System.Linq;
using NUnit.Framework;
using osu.Game.Beatmaps;
using osu.Game.Rulesets.Mania.Mods;
using osu.Game.Tests.Visual;
using System.Collections.Generic;
using osu.Game.Rulesets.Mania.Objects;
using osu.Game.Beatmaps.ControlPoints;
using osu.Game.Rulesets.Mania.Beatmaps;

namespace osu.Game.Rulesets.Mania.Tests.Mods
{
    public class TestSceneManiaModHoldOff : ModTestScene
    {
        protected override Ruleset CreatePlayerRuleset() => new ManiaRuleset();

        [Test]
        public void TestMapHasNoHoldNotes()
        {
            var testBeatmap = createModdedBeatmap();
            Assert.False(testBeatmap.HitObjects.OfType<HoldNote>().Any());
        }

        [Test]
        public void TestCorrectNoteValues()
        {
            var testBeatmap = createRawBeatmap();
            var noteValues = new List<double>(testBeatmap.HitObjects.OfType<HoldNote>().Count());

            foreach (HoldNote h in testBeatmap.HitObjects.OfType<HoldNote>())
            {
                noteValues.Add(ManiaModHoldOff.GetNoteDurationInBeatLength(h, testBeatmap));
            }

            noteValues.Sort();
            Assert.AreEqual(noteValues, new List<double> { 0.125, 0.250, 0.500, 1.000, 2.000 });
        }

        [Test]
        public void TestCorrectObjectCount()
        {
            // Ensure that the mod produces the expected number of objects when applied.

            var rawBeatmap = createRawBeatmap();
            var testBeatmap = createModdedBeatmap();

            // Calculate expected number of objects
            int expectedObjectCount = 0;
            double beatSnapValue = ManiaModHoldOff.Threshold;

            foreach (ManiaHitObject h in rawBeatmap.HitObjects)
            {
                // Both notes and hold notes account for at least one object
                expectedObjectCount++;

                if (h.GetType() == typeof(HoldNote))
                {
                    double noteValue = ManiaModHoldOff.GetNoteDurationInBeatLength((HoldNote)h, rawBeatmap);

                    if (noteValue >= beatSnapValue)
                    {
                        // Should generate an end note if it's longer than the minimum note value
                        expectedObjectCount++;
                    }
                }
            }

            Assert.That(testBeatmap.HitObjects.Count == expectedObjectCount);
        }

        private static ManiaBeatmap createModdedBeatmap()
        {
            var beatmap = createRawBeatmap();
            var holdOffMod = new ManiaModHoldOff();

            foreach (var hitObject in beatmap.HitObjects)
                hitObject.ApplyDefaults(beatmap.ControlPointInfo, new BeatmapDifficulty());

            holdOffMod.ApplyToBeatmap(beatmap);

            return beatmap;
        }

        private static ManiaBeatmap createRawBeatmap()
        {
            var beatmap = new ManiaBeatmap(new StageDefinition { Columns = 1 });
            beatmap.ControlPointInfo.Add(0.0, new TimingControlPoint { BeatLength = 1000 }); // Set BPM to 60

            // Add test hit objects
            beatmap.HitObjects.Add(new Note { StartTime = 4000 });
            beatmap.HitObjects.Add(new Note { StartTime = 4500 });
            beatmap.HitObjects.Add(new HoldNote { StartTime = 0, EndTime = 125 }); // 1/8 note
            beatmap.HitObjects.Add(new HoldNote { StartTime = 0, EndTime = 250 }); // 1/4 note
            beatmap.HitObjects.Add(new HoldNote { StartTime = 0, EndTime = 500 }); // 1/2 note
            beatmap.HitObjects.Add(new HoldNote { StartTime = 0, EndTime = 1000 }); // 1/1 note
            beatmap.HitObjects.Add(new HoldNote { StartTime = 0, EndTime = 2000 }); // 2/1 note

            return beatmap;
        }
    }
}