using LibXom.Data;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace LibW4M.Data.Highscores
{
    public class HighscoreCollective : SaveDataCollective
    {
        public HighscoreCollective(W4SaveFile fileBelongs, XomContainer mainContainer) : base(fileBelongs, mainContainer)
        {
        }

        public override void Create()
        {
            HighscoreData highscore = new HighscoreData(this.fileBelongs, this.fileBelongs.CreateContainer("HighScoreData"), false);
            this.collectiveEntries.Add(highscore);
        }

        public override void Load()
        {
            // highscore data is stored after teams data section of TeamDataCollective.

            int[] decompressedCollective = mainContainer.Decompress();
            int teamsLen = decompressedCollective[0];
            int highscoreStart = teamsLen + 1;
            int highscoresLen = decompressedCollective[highscoreStart];
            for (int i = 0; i < highscoresLen; i++)
            {
                HighscoreData highscoreData = new HighscoreData(fileBelongs, fileBelongs.LookupContainerById(decompressedCollective[highscoreStart + i + 1]));
                collectiveEntries.Add(highscoreData);
            }
        }

        public override void Save()
        {
            // Decompress the collective
            int[] decompressedCollective = mainContainer.Decompress();
            // get total length of teams collective
            int teamsLen = decompressedCollective[0];

            // Highscore collective starts right *after* the teams collective.
            int highscoreStart = teamsLen + 1;
            // get the current number of highscores.
            int highscoresLen = this.Length;

            // copy teams data from collective.
            int[] teamsData = new int[teamsLen + 1];
            Array.Copy(decompressedCollective, teamsData, teamsData.Length);

            // copy teams data back to collective.
            int[] newCollective = new int[teamsData.Length + highscoresLen + 1];
            Array.Copy(teamsData, newCollective, teamsData.Length);

            // populate highscores collective
            newCollective[highscoreStart] = highscoresLen;
            for (int i = 0; i < highscoresLen; i++)
            {
                HighscoreData highscoreData = collectiveEntries[i] as HighscoreData;
                highscoreData.Save();
                newCollective[highscoreStart + i + 1] = highscoreData.mainContainer.Id;
            }

            // Compress whole collective and update the underlying container.
            mainContainer.CompressAndUpdate(newCollective);
        }
    }
}