using System.Collections;
using System.Collections.Generic;
using UnityEngine;

namespace Ichni.RhythmGame
{
    /// <summary>
    /// 单个歌曲难度的最佳成绩。
    /// 这里只保存当前 Chart Revision 下可比较的最佳记录，不保存逐局历史、判定时间线或 Replay。
    /// </summary>
    public class BeatmapSave
    {
        /// <summary>历史最高 Accuracy，固定使用 0 到 1；显示时由 UI 乘以 100。</summary>
        public float accuracy;

        /// <summary>当前 Revision 下是否曾达成 Full Combo。</summary>
        public bool isFullCombo;

        /// <summary>当前 Revision 下是否曾达成 All Perfect。</summary>
        public bool isAllPerfect;

        /// <summary>成绩对应的谱面修订号；0 表示尚未绑定 Revision 的新建或异常记录。</summary>
        public int chartRevision;

        /// <summary>当前 Revision 下的历史最高连击数。</summary>
        public int maxCombo;

        public BeatmapSave()
        {
            
        }
        
        public BeatmapSave(float accuracy, bool isFullCombo, bool isAllPerfect)
        {
            this.accuracy = accuracy;
            this.isFullCombo = isFullCombo;
            this.isAllPerfect = isAllPerfect;
        }

        /// <summary>
        /// 令存档成绩匹配当前谱面 Revision。
        /// <para>仅当 Note、Timing 或判定规则改变、导致成绩不再可比较时才递增 Revision。</para>
        /// <para>未绑定 Revision 的记录会保留已有成绩并绑定到当前 Revision；之后出现真正的 Revision
        /// 变化时，才仅重置该谱面的可比成绩。</para>
        /// </summary>
        public bool EnsureChartRevision(int currentChartRevision)
        {
            currentChartRevision = Mathf.Max(1, currentChartRevision);

            if (chartRevision <= 0)
            {
                chartRevision = currentChartRevision;
                return true;
            }

            if (chartRevision == currentChartRevision)
            {
                return false;
            }

            accuracy = 0f;
            isFullCombo = false;
            isAllPerfect = false;
            maxCombo = 0;
            chartRevision = currentChartRevision;
            return true;
        }

        /// <summary>
        /// 合并一次完整演奏的成绩。
        /// <see cref="accuracy"/> 在持久化记录中始终使用 0 到 1 的归一化值，
        /// 而 <see cref="PlayingRecorder.accuracy"/> 的运行时显示值为 0 到 100。
        /// 写入规则是“最高 Accuracy / 最高 Max Combo / FC 与 AP 成就粘性保留”，而不是保存最近一次成绩。
        /// </summary>
        public bool ApplyPlayResult(PlayingRecorder recorder, int currentChartRevision)
        {
            if (recorder == null || recorder.totalCount <= 0)
            {
                return false;
            }

            bool changed = EnsureChartRevision(currentChartRevision);
            float normalizedAccuracy = Mathf.Clamp01(recorder.accuracy / 100f);
            if (normalizedAccuracy > accuracy)
            {
                accuracy = normalizedAccuracy;
                changed = true;
            }

            bool achievedFullCombo = recorder.isFullCombo || recorder.isAllPerfect;
            if (achievedFullCombo && !isFullCombo)
            {
                isFullCombo = true;
                changed = true;
            }

            if (recorder.isAllPerfect && !isAllPerfect)
            {
                isAllPerfect = true;
                changed = true;
            }

            if (recorder.maxCombo > maxCombo)
            {
                maxCombo = recorder.maxCombo;
                changed = true;
            }

            return changed;
        }
        
        /// <summary>用于章节完成度统计；Revision 本身不代表玩家已经游玩过该谱面。</summary>
        public bool IsEmpty()
        {
            return accuracy == 0f && !isFullCombo && !isAllPerfect && maxCombo == 0;
        }
    }
}