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

using System.IO;

using UnityEngine;
using UnityEditor;
using UnityEngine.SceneManagement;

public class Timing: MonoBehaviour {
    TimingUI ui;
    LapService lapService;

    public List<SectorTime> sectorTimes;
    public bool timerEnabled;

    public string mapName;
    public double sectorTime;
    public double lapTime;
    public Sector[] sectors;

    double sectorStart;
    double lapStart;

    IEnumerator noticeLifecycle;

    void Awake() {
        ui = GetComponent<TimingUI>();
        sectorTimes = new List<SectorTime>();
        sectorStart = 0.0;
        sectorTime = 0.0;
        sectors = FindObjectsByType<Sector>(FindObjectsSortMode.None).OrderBy(s => s.sector).ToArray();

        // set map name
        Scene scene = SceneManager.GetActiveScene();
        mapName = scene.name;
        Debug.Log("Track Sector Count - " + sectors.Length);

        lapService = new LapService(mapName);
    }

    void Start() {
        Debug.Log("Timing Starting...");
        StartCoroutine(lapService.GetLapTimes());
    }

    void Update() {
        // hmr
        if (lapService == null) {
            Awake();
            Start();
        }

        if (timerEnabled) {
            sectorTime = Time.timeAsDouble - sectorStart;
            lapTime = Time.timeAsDouble - lapStart;
        }
    }

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

        Debug.Log("Started Timer");

        timerEnabled = true;
        lapStart = Time.timeAsDouble;
        sectorStart = Time.timeAsDouble;
    }

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

    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;

        // alright they legitimately finished a sector...
        double sTime = Time.timeAsDouble - sectorStart;
        SectorTime s = new SectorTime { Sector = sector, Seconds = sTime };
        sectorTimes.Add(s);
        Debug.Log($"{sectorTimes.Count} / {sectors.Length}");

        // restart the timer for the next sector
        sectorStart = Time.timeAsDouble;

        // they finished a lap!
        if (sectorTimes.Count == sectors.Length) {
            EndLap();
            NextLap();
        }
    }

    void NextLap() {
        sectorTimes = new List<SectorTime>();
        StartTimer();
    }

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

        Debug.Log($"Ending lap Sectors={sectorTimes.Count} Name={mapName}");
        Lap l = new Lap { Map = mapName, Sectors = sectorTimes };
        Debug.Log($"EndLap {l}");

        // have to show this before we persist the lap in case it is the pb
        if (noticeLifecycle != null) StopCoroutine(noticeLifecycle);
        noticeLifecycle = RecentLapLifecycle(l);
        StartCoroutine(noticeLifecycle);
        StartCoroutine(lapService?.PostLap(l));
    }

    IEnumerator RecentLapLifecycle(Lap l) {
        ui.ShowRecentLap(l);
        yield return new WaitForSeconds(5);
        ui.HideRecentLap();
    }

    // these can be null after HMR
    public Lap LapRecord => lapService?.LapRecord;
    public Lap Pb => lapService?.Pb;
    public string Position => $"{lapService?.Position} / {lapService?.Completions}";

    public TimingNotice CompareLap(Lap lap) {
        double? lrSeconds = LapRecord != null ? LapRecord.TotalTime : null;
        double? pbSeconds = Pb != null ? Pb.TotalTime : null;
        return TimingNotice.Compare(lap.TotalTime, pbSeconds, lrSeconds);
    }

    public TimingNotice CompareSector(SectorTime s) {
        double? lrSeconds = LapRecord switch {
            null => null,
            Lap lr => lr.Sectors.SingleOrDefault(lrs => lrs.Sector == s.Sector) switch {
                SectorTime lrSector => lrSector.Seconds,
                _ => null,
            },
        };

        double? pbSeconds = Pb switch {
            null => null,
            Lap pb => pb.Sectors.SingleOrDefault(pbs => pbs.Sector == s.Sector) switch {
                SectorTime pbSector => pbSector.Seconds,
                _ => null,
            },
        };

        return TimingNotice.Compare(s.Seconds, pbSeconds, lrSeconds);
    }
}