using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;

namespace MU3.Data;

public class patch_DataManager: DataManager {
    private Dictionary<int, FumenAnalysisData> _fumenAnalysisData;
    private string _fileName;

    private void initCache() {
        if(File.Exists(_fileName)) {
            System.Console.WriteLine("Loading chart analysis cache...");
            _fumenAnalysisData = [];
            using FileStream input = File.OpenRead(_fileName);
            using BinaryReader binaryReader = new BinaryReader(input);

            while(binaryReader.BaseStream.Position < binaryReader.BaseStream.Length) {
                int key = binaryReader.ReadInt32();
                bool isExist = binaryReader.ReadBoolean();
                int bpm = binaryReader.ReadInt32();
                int platinumScoreMax = binaryReader.ReadInt32();
                string notesDesignerName = binaryReader.ReadString();
                _fumenAnalysisData.Add(key, new FumenAnalysisData {
                    isExist = isExist,
                    bpm = bpm,
                    platinumScoreMax = platinumScoreMax,
                    notesDesignerName = notesDesignerName
                });
            }
        } else {
            _fumenAnalysisData = [];
        }
    }

    private void saveCache() {
        System.Console.WriteLine($"Saving chart analysis cache...{Enumerable.First(_fumenAnalysisData).Key},{Enumerable.First(_fumenAnalysisData).Value.notesDesignerName}");
        if(File.Exists(_fileName)) {
            File.Delete(_fileName);
        }
        using FileStream fileStream = File.OpenWrite(_fileName);
        using BinaryWriter binaryWriter = new BinaryWriter(fileStream);
        foreach(KeyValuePair<int, FumenAnalysisData> fumenAnalysisDatum in _fumenAnalysisData) {
            binaryWriter.Write(fumenAnalysisDatum.Key);
            binaryWriter.Write(fumenAnalysisDatum.Value.isExist);
            binaryWriter.Write(fumenAnalysisDatum.Value.bpm);
            binaryWriter.Write(fumenAnalysisDatum.Value.platinumScoreMax);
            binaryWriter.Write(fumenAnalysisDatum.Value.notesDesignerName);
        }
        fileStream.Flush();
    }

    private extern void orig_makeFumenAnalysisDataList();

    private void makeFumenAnalysisDataList() {
        using IniFile iniFile = new("mu3.ini");
        _fileName = Path.Combine(iniFile.getValue("Extra", "CacheDir", "."), "data_fumen_analysis_cache.bin");

        try {
            if(patch_DataStudioManager.needSave || !File.Exists(_fileName)) {
                orig_makeFumenAnalysisDataList();
                saveCache();
            } else {
                initCache();
            }
        } catch(Exception value) {
            System.Console.WriteLine(value);
        }
    }
}