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

using System.IO;

using UnityEngine;

public enum SectorColour {
    Green,
    Purple,
    White,
    Yellow,
}

[Serializable]
public class SectorTime {
    public int Sector;
    public double Seconds;
    public override string ToString() => $"{Seconds:0.000}";
}

[Serializable]
public class Lap {
    public string Map;
    public List<SectorTime> Sectors;

    // 0:1:39
    public override string ToString() {
        return $"{TimeSpan.FromSeconds(TotalTime()):m\\:ss\\.fff}";
    }

    public double TotalTime() {
        return Sectors.Sum(s => s.Seconds);
    }
}


[Serializable]
public class LapJSON {
    public string Map;
    public List<Lap> Laps = new();
}

// We can't save a dictionary with the Unity JSONUtility
// so we use this to hold a list of maps
public class LapStorage {
    public List<LapJSON> Laps = new();
}

static class LapStorageService {
    static Dictionary<string, LapJSON> lapsByMap = new();
    static string lapStoragePath = Path.Combine(Application.persistentDataPath, "lapStorage.json");

    static LapStorageService() {
        LapStorage lapStorage = new LapStorage();

        try {
            string json = File.ReadAllText(lapStoragePath);
            JsonUtility.FromJsonOverwrite(json, lapStorage);
        } catch {
            Debug.Log("No existing lapStorage.json");
        }

        lapsByMap = lapStorage.Laps.ToDictionary((lapJson) => lapJson.Map);
    }

    public static LapJSON GetPlayerLaps(string mapName) {
        LapJSON currentLaps;
        bool found = lapsByMap.TryGetValue(mapName, out currentLaps);
        if (!found) return EnsureMap(mapName);
        return currentLaps;
    }

    public static LapJSON EnsureMap(string mapName) {
        LapJSON lapJson = new LapJSON { Map = mapName, Laps = new List<Lap>() };
        lapsByMap[mapName] = lapJson;
        return lapJson;
    }

    static void Persist() {
        LapStorage lapStorage = new LapStorage { Laps = lapsByMap.Values.ToList() };
        File.WriteAllText(lapStoragePath, JsonUtility.ToJson(lapStorage));
    }

    // laps.count
    public static int NumberOfCompletions() { return 0; }

    // finds your PB in all completions
    public static int Rank() { return 1; }

    public static void PersistLap(Lap lap) {
        LapJSON lapJson = GetPlayerLaps(lap.Map);
        lapJson.Laps.Add(lap);
        lapsByMap[lap.Map] = lapJson; // not needed?
        Persist();
    }

    public static Lap PB(string mapName) {
        return lapsByMap[mapName].Laps
            .MinBy(l => l.TotalTime());
    }
}