using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Numerics;
using System.Security.Cryptography;

namespace F4SD.Gamification.Services
{
    public class LevelService
    {
        private static readonly List<(int MinimumTotalExperiencePoints, int Level)> _experienceToLevelMap = new()
        {
            (0,1),
            (1128,2),
            (2400,3),
            (3832,4),
            (5440,5),
            (7240,6),
            (9248,7),
            (11480,8),
            (13952,9),
            (16680,10),
            (19680,11),
            (22968,12),
            (26560,13),
            (30472,14),
            (34720,15),
            (39320,16),
            (44288,17),
            (49640,18),
            (55392,19),
            (61560,20),
            (68160,21),
            (75208,22),
            (82720,23),
            (90712,24),
            (99200,25),
            (108200,26),
            (117728,27),
            (127800,28),
            (138432,29),
            (149640,30),
            (161440,31),
            (173848,32),
            (186880,33),
            (200552,34),
            (214880,35),
            (229880,36),
            (245568,37),
            (261960,38),
            (279072,39),
            (296920,40),
            (315520,41),
            (334888,42),
            (355040,43),
            (375992,44),
            (397760,45),
            (420360,46),
            (443808,47),
            (468120,48),
            (493312,49),
            (519400,50),
        };

        private int _totalExperiencePoints = 0;
        private int _currentExperiencePoints;

        private int _level;

        internal void InitializeAction(CockpitAction action)
        {
            AddExperiencePoints(GetExperiencePointsFor(action), true);
        }

        internal void TrackAction(CockpitAction type, params object[] args)
        {
            AddExperiencePoints(GetExperiencePointsFor(type));
        }

        private void AddExperiencePoints(int points, bool isInitialization = false)
        {
            _totalExperiencePoints += points;
            UpdateLevel(isInitialization);
            UpdateCurrentExperiencePoints();

            if (isInitialization)
                return;

            ExperiencePointsChanged?.Invoke(null, new LevelEventArgs()
            {
                CurrentLevel = _level,
                LevelTitle = GetTitle(_level),
                CurrentXp = _currentExperiencePoints,
                XpRequiredForLevelUp = GetXpRequiredForNextLevel()
            });
        }

        private void UpdateCurrentExperiencePoints()
        {
            int xpForCurrentLevel = _experienceToLevelMap.FirstOrDefault(mapEntry => mapEntry.Level == _level).MinimumTotalExperiencePoints;
            _currentExperiencePoints = _totalExperiencePoints - xpForCurrentLevel;
        }

        private void UpdateLevel(bool isInitialization)
        {
            int previousLevel = _level;
            _level = _experienceToLevelMap.FirstOrDefault(mapEntry => _totalExperiencePoints < mapEntry.MinimumTotalExperiencePoints).Level - 1;

            if (!isInitialization && previousLevel < _level)
                LevelChanged?.Invoke(null, new LevelEventArgs() { CurrentLevel = _level, LevelTitle = GetTitle(_level) });
        }

        private int GetXpRequiredForNextLevel()
        {
            int totalXpForNextLevel = _experienceToLevelMap.FirstOrDefault(mapEntry => mapEntry.Level == _level + 1).MinimumTotalExperiencePoints;
            int totalXpForCurrentLevel = _experienceToLevelMap.FirstOrDefault(mapEntry => mapEntry.Level == _level).MinimumTotalExperiencePoints;
            return totalXpForNextLevel - totalXpForCurrentLevel;
        }

        private int GetExperiencePointsFor(CockpitAction action)
        {
            switch (action)
            {
                case CockpitAction.CaseOpened:
                    break;
                case CockpitAction.CaseClosed:
                    return 10;
                case CockpitAction.QuickActionExecuted:
                    return 20;
                case CockpitAction.CopyTemplateClicked:
                    return 5;
                case CockpitAction.BuiltDirectConnection:
                    break;
                case CockpitAction.AddNotes:
                    break;
                case CockpitAction.StartRemoteConnection:
                    return 50;
                default:
                    break;
            }

            return 1;
        }

        private static string GetTitle(int level)
        {
            switch (level)
            {
                case <= 5:
                    return "Support Trainee";
                case <= 10:
                    return "Response Assistant";
                case <= 15:
                    return "Service Aider";
                case <= 20:
                    return "Ticket Resolver";
                case <= 25:
                    return "Customer Navigator";
                case <= 30:
                    return "Incident Coordinator";
                case <= 35:
                    return "IT Guy";
                case <= 40:
                    return "Support Specialist";
                case <= 45:
                    return "Service Mentor";
                case <= 49:
                    return "Operations Lead";
                case > 49:
                    return "Ticket Titan";
            }
        }

        public static event EventHandler<LevelEventArgs> ExperiencePointsChanged;
        public static event EventHandler<LevelEventArgs> LevelChanged;
    }
}