// 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;
using osu.Game.Rulesets.Judgements;
using osu.Game.Rulesets.Scoring;
using osu.Game.Scoring;

namespace osu.Game.Rulesets.Catch.Scoring
{
    public partial class CatchScoreProcessor : ScoreProcessor
    {
        private const double accuracy_cutoff_x = 1;
        private const double accuracy_cutoff_s = 0.98;
        private const double accuracy_cutoff_a = 0.94;
        private const double accuracy_cutoff_b = 0.9;
        private const double accuracy_cutoff_c = 0.85;
        private const double accuracy_cutoff_d = 0;

        private const int combo_cap = 200;
        private const double combo_base = 4;

        public CatchScoreProcessor()
            : base(new CatchRuleset())
        {
        }

        protected override double ComputeTotalScore(double comboProgress, double accuracyProgress, double bonusPortion)
        {
            return 600000 * comboProgress
                   + 400000 * Accuracy.Value * accuracyProgress
                   + bonusPortion;
        }

        protected override double GetComboScoreChange(JudgementResult result)
            => Judgement.ToNumericResult(result.Type) * Math.Min(Math.Max(0.5, Math.Log(result.ComboAfterJudgement, combo_base)), Math.Log(combo_cap, combo_base));

        public override ScoreRank RankFromAccuracy(double accuracy)
        {
            if (accuracy == accuracy_cutoff_x)
                return ScoreRank.X;
            if (accuracy >= accuracy_cutoff_s)
                return ScoreRank.S;
            if (accuracy >= accuracy_cutoff_a)
                return ScoreRank.A;
            if (accuracy >= accuracy_cutoff_b)
                return ScoreRank.B;
            if (accuracy >= accuracy_cutoff_c)
                return ScoreRank.C;

            return ScoreRank.D;
        }

        public override double AccuracyCutoffFromRank(ScoreRank rank)
        {
            switch (rank)
            {
                case ScoreRank.X:
                case ScoreRank.XH:
                    return accuracy_cutoff_x;

                case ScoreRank.S:
                case ScoreRank.SH:
                    return accuracy_cutoff_s;

                case ScoreRank.A:
                    return accuracy_cutoff_a;

                case ScoreRank.B:
                    return accuracy_cutoff_b;

                case ScoreRank.C:
                    return accuracy_cutoff_c;

                case ScoreRank.D:
                    return accuracy_cutoff_d;

                default:
                    throw new ArgumentOutOfRangeException(nameof(rank), rank, null);
            }
        }
    }
}
