// Copyright (c) 2007-2017 ppy Pty Ltd <contact@ppy.sh>.
// Licensed under the MIT Licence - https://raw.githubusercontent.com/ppy/osu/master/LICENCE

using System;
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Linq;
using Newtonsoft.Json;
using osu.Game.IO.Serialization;
using osu.Game.Rulesets;

namespace osu.Game.Beatmaps
{
    public class BeatmapInfo : IEquatable<BeatmapInfo>, IJsonSerializable
    {
        [Key, DatabaseGenerated(DatabaseGeneratedOption.Identity)]
        public int Id { get; set; }

        //TODO: should be in database
        public int BeatmapVersion;

        public int? BeatmapOnlineInfoId { get; set; }

        public int? BeatmapSetOnlineInfoId { get; set; }

        [ForeignKey(nameof(BeatmapSetInfo))]
        public int BeatmapSetInfoId { get; set; }
        public BeatmapSetInfo BeatmapSetInfo { get; set; }

        [ForeignKey(nameof(BeatmapMetadata))]
        public int BeatmapMetadataId { get; set; }
        public BeatmapMetadata BeatmapMetadata { get; set; }

        [ForeignKey(nameof(BeatmapDifficulty))]
        public int BeatmapDifficultyId { get; set; }
        public BeatmapDifficulty BeatmapDifficulty { get; set; }

        [NotMapped]
        public BeatmapMetrics Metrics { get; set; }

        [NotMapped]
        public BeatmapOnlineInfo OnlineInfo { get; set; }

        public string Path { get; set; }

        [JsonProperty("file_sha2")]
        public string Hash { get; set; }

        public bool Hidden { get; set; }

        /// <summary>
        /// MD5 is kept for legacy support (matching against replays, osu-web-10 etc.).
        /// </summary>
        [JsonProperty("file_md5")]
        public string MD5Hash { get; set; }

        // General
        public int AudioLeadIn { get; set; }
        public bool Countdown { get; set; }
        public float StackLeniency { get; set; }
        public bool SpecialStyle { get; set; }

        [ForeignKey(nameof(RulesetInfo))]
        public int RulesetInfoId { get; set; }
        public RulesetInfo RulesetInfo { get; set; }

        public bool LetterboxInBreaks { get; set; }
        public bool WidescreenStoryboard { get; set; }

        // Editor
        // This bookmarks stuff is necessary because DB doesn't know how to store int[]
        [JsonIgnore]
        public string StoredBookmarks
        {
            get { return string.Join(",", Bookmarks); }
            set
            {
                if (string.IsNullOrEmpty(value))
                {
                    Bookmarks = new int[0];
                    return;
                }

                Bookmarks = value.Split(',').Select(v =>
                {
                    int val;
                    bool result = int.TryParse(v, out val);
                    return new { result, val };
                }).Where(p => p.result).Select(p => p.val).ToArray();
            }
        }

        [NotMapped]
        public int[] Bookmarks { get; set; } = new int[0];

        public double DistanceSpacing { get; set; }
        public int BeatDivisor { get; set; }
        public int GridSize { get; set; }
        public double TimelineZoom { get; set; }

        // Metadata
        public string Version { get; set; }

        public double StarDifficulty { get; set; }

        public bool Equals(BeatmapInfo other)
        {
            if (Id == 0 || other?.Id == 0)
                // one of the two BeatmapInfos we are comparing isn't sourced from a database.
                // fall back to reference equality.
                return ReferenceEquals(this, other);

            return Id == other?.Id;
        }

        public bool AudioEquals(BeatmapInfo other) => other != null && BeatmapSetInfo != null && other.BeatmapSetInfo != null &&
                                                      BeatmapSetInfo.Hash == other.BeatmapSetInfo.Hash &&
                                                      (BeatmapMetadata ?? BeatmapSetInfo.BeatmapMetadata).AudioFile == (other.BeatmapMetadata ?? other.BeatmapSetInfo.BeatmapMetadata).AudioFile;

        public bool BackgroundEquals(BeatmapInfo other) => other != null && BeatmapSetInfo != null && other.BeatmapSetInfo != null &&
                                                      BeatmapSetInfo.Hash == other.BeatmapSetInfo.Hash &&
                                                      (BeatmapMetadata ?? BeatmapSetInfo.BeatmapMetadata).BackgroundFile == (other.BeatmapMetadata ?? other.BeatmapSetInfo.BeatmapMetadata).BackgroundFile;
    }
}