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;

    public List<SectorTime> sectorTimes;
    public bool timerEnabled;

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

    double sectorStart;
    double lapStart;

    void Awake() {
        ui = GetComponent<TimingUI>();
        sectorTimes = new List<SectorTime>();
        sectorStart = 0.0;
        sectorTime = 0.0;
        sectors = GetComponentsInChildren<Sector>().OrderBy(s => s.sector).ToArray();

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

        LapStorageService.GetPlayerLaps(mapName);
    }

    void Update() {
        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;

        double sTime = Time.timeAsDouble - sectorStart;

        SectorTime s = new SectorTime { Sector = sector, Seconds = sTime };
        sectorTimes.Add(s);
        sectorStart = Time.timeAsDouble;

        Debug.Log($"{sectorTimes.Count} / {sectors.Length}");

        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}");

        LapStorageService.PersistLap(l);
        StartCoroutine(RecentLapLifecycle(l));
    }

    IEnumerator RecentLapLifecycle(Lap l) {
        ui.ShowRecentLap(l);
        yield return new WaitForSeconds(3);
        ui.HideRecentLap();
    }

    public Lap PB() {
        return LapStorageService.PB(mapName);
    }

    public double PBSectorDiff(SectorTime s) => PB() switch {
        Lap pb => pb.Sectors.SingleOrDefault(fls => fls.Sector == s.Sector) switch {
            SectorTime fastestSector => s.Seconds - fastestSector.Seconds,
            null => -1d,
        },
        null => -1d,
    };

    public double PBLapDiff(Lap lap) => PB() switch {
        Lap pb => lap.TotalTime() - pb.TotalTime(),
        null => -1d,
    };

}