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

using UnityEngine;
using UnityEditor;

public readonly struct SectorTime {
    public SectorTime(int i, double t) {
        Sector = i;
        Value = t;
    }

    public int Sector { get; }
    public double Value { get; }

    public override string ToString() => $"{Sector} {Value:0.000}";
}

public readonly struct Lap {
    public Lap(int i, List<SectorTime> s) {
        Sectors = s;
        Number = i;
    }

    public int Number { get; }
    public List<SectorTime> Sectors { get; }

    public override string ToString() {
        return $"Lap {Number} : {TimeSpan.FromSeconds(TotalTime()):g} {String.Join(" ", Sectors.ConvertAll(s => s.ToString()))}";
    }

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

public class Timing: MonoBehaviour {
    [SerializeField]
    public List<Lap> lapTimes;
    [SerializeField]
    public List<SectorTime> sectorTimes;
    public bool timerEnabled;

    public double sectorTime;
    double sectorStart;
    Sector[] sectors;

    void Awake() {
        lapTimes = new List<Lap>();
        sectorTimes = new List<SectorTime>();
        sectorStart = 0.0;
        sectorTime = 0.0;
        sectors = GetComponentsInChildren<Sector>();
        Debug.Log("Track Sector Count - " + sectors.Length);
    }

    void Update() {
        if (timerEnabled)
            sectorTime = Time.timeAsDouble - sectorStart;
    }

    public void StartTimer() {
        if (sectors.Length == 0) {
            Debug.LogWarning("No Sectors found in timing");
            return;
        }

        Debug.Log("Started Timer");

        timerEnabled = true;
        sectorStart = Time.timeAsDouble;
    }

    public void StopTimer() {
        sectorTimes = new List<SectorTime>();
        timerEnabled = false;
        sectorTime = 0;
        Debug.Log("Timer Stopped");

        EndLap();
    }

    public void NextSector(int sector) {
        if (!timerEnabled)
            return;

        // they turned around or somethin?
        if (sectorTimes.Any(s => s.Sector == sector))
            return;

        // this basically makes sure the timer doesn't do anything weird
        // due to respawns, driving in the wrong direction etc
        // you have to hit the sectors in numbered order
        // ---------------
        // make sure sectors are only accessible by being hit by following
        // the track correctly!
        if (sector != sectorTimes.Count + 1)
            return;

        double sTime = Time.timeAsDouble - sectorStart;

        SectorTime s = new SectorTime(sector, sTime);
        sectorTimes.Add(s);

        if (sectorTimes.Count == sectors.Length) {
            EndLap();
            NextLap();
        }
    }

    void NextLap() {
        Debug.Log("NextLap" + lapTimes.Count);
        sectorTimes = new List<SectorTime>();
        StartTimer();
    }

    public void EndLap() {
        // when live reloading this happens
        if (sectorTimes == null)
            Awake();

        if (sectorTimes.Count > 0) {
            Lap l = new Lap(lapTimes.Count, sectorTimes);
            Debug.Log($"EndLap {l}");
            lapTimes.Add(l);
        }
    }
}