// 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 JetBrains.Annotations;
using McMaster.Extensions.CommandLineUtils;
using osu.Game.Beatmaps;
using osu.Game.Rulesets;
using osu.Game.Rulesets.Catch;
using osu.Game.Rulesets.Catch.Objects;
using osu.Game.Rulesets.Mods;
using osu.Game.Rulesets.Scoring;
using System;
using System.Collections.Generic;
using System.Linq;

namespace PerformanceCalculator.Simulate
{
    [Command(Name = "catch", Description = "Computes the performance (pp) of a simulated osu!catch play.")]
    public class CatchSimulateCommand : SimulateCommand
    {
        [UsedImplicitly]
        [Option(Template = "-c|--combo <combo>", Description = "Maximum combo during play. Defaults to beatmap maximum.")]
        public override int? Combo { get; }

        [UsedImplicitly]
        [Option(Template = "-C|--percent-combo <combo>", Description = "Percentage of beatmap maximum combo achieved. Alternative to combo option. Enter as decimal 0-100.")]
        public override double PercentCombo { get; } = 100;

        [UsedImplicitly]
        [Option(Template = "-T|--tiny-droplets <tinys>", Description = "Number of tiny droplets hit. Will override accuracy if used. Otherwise is automatically calculated.")]
        public override int? Mehs { get; }

        [UsedImplicitly]
        [Option(Template = "-D|--droplets <droplets>", Description = "Number of droplets hit. Will override accuracy if used. Otherwise is automatically calculated.")]
        public override int? Goods { get; }

        public override Ruleset Ruleset => new CatchRuleset();

        protected override Dictionary<HitResult, int> GenerateHitResults(IBeatmap beatmap, Mod[] mods) => generateHitResults(beatmap, Accuracy / 100, Misses, Mehs, Goods);

        private static Dictionary<HitResult, int> generateHitResults(IBeatmap beatmap, double accuracy, int countMiss, int? countMeh, int? countGood)
        {
            int maxCombo = beatmap.GetMaxCombo();
            int maxTinyDroplets = beatmap.HitObjects.OfType<JuiceStream>().Sum(s => s.NestedHitObjects.OfType<TinyDroplet>().Count());
            int maxDroplets = beatmap.HitObjects.OfType<JuiceStream>().Sum(s => s.NestedHitObjects.OfType<Droplet>().Count()) - maxTinyDroplets;
            int maxFruits = beatmap.HitObjects.Sum(h => h is Fruit ? 1 : (h as JuiceStream)?.NestedHitObjects.Count(n => n is Fruit) ?? 0);

            // Either given or max value minus misses
            int countDroplets = countGood ?? Math.Max(0, maxDroplets - countMiss);

            // Max value minus whatever misses are left. Negative if impossible missCount
            int countFruits = maxFruits - (countMiss - (maxDroplets - countDroplets));

            // Either given or the max amount of hit objects with respect to accuracy minus the already calculated fruits and drops.
            // Negative if accuracy not feasable with missCount.
            int countTinyDroplets = countMeh ?? (int)Math.Round(accuracy * (maxCombo + maxTinyDroplets)) - countFruits - countDroplets;

            // Whatever droplets are left
            int countTinyMisses = maxTinyDroplets - countTinyDroplets;

            return new Dictionary<HitResult, int>
            {
                { HitResult.Great, countFruits },
                { HitResult.LargeTickHit, countDroplets },
                { HitResult.SmallTickHit, countTinyDroplets },
                { HitResult.SmallTickMiss, countTinyMisses },
                { HitResult.Miss, countMiss }
            };
        }

        protected override double GetAccuracy(IBeatmap beatmap, Dictionary<HitResult, int> statistics, Mod[] mods)
        {
            double hits = statistics[HitResult.Great] + statistics[HitResult.LargeTickHit] + statistics[HitResult.SmallTickHit];
            double total = hits + statistics[HitResult.Miss] + statistics[HitResult.SmallTickMiss];

            return hits / total;
        }
    }
}