using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.Extensions.Logging;
using TOOHUCardAPI.Data.Enums;
using TOOHUCardAPI.Data.Models;
using TOOHUCardAPI.Data.Repositories;
using TOOHUCardAPI.DTO.RankData;

namespace TOOHUCardAPI.Data.Services
{
    public class RankService
    {
        private readonly ILogger<RankService> _logger;
        private readonly RankRepository _rankRepository;
        private readonly UserRepository _userRepository;
        private readonly UserService _userService;
        private readonly StoreService _storeService;

        public RankService(ILogger<RankService> logger, RankRepository rankRepository, UserRepository userRepository, UserService userService, StoreService storeService)
        {
            _logger = logger;
            _rankRepository = rankRepository;
            _userRepository = userRepository;
            _userService = userService;
            _storeService = storeService;
        }

        private async Task AwardPointsForEntry(long steamid, RankEntry entry, List<RankEntry> allEntries)
        {
            int bonus = AppSettings.DefaultRankBonus;
            int index = allEntries.FindIndex(i => i.Id == entry.Id)+1;
            if (index <= 0)
            {
                index = allEntries.Count + 1;
            }
            switch (index)
            {
                case <= 4:
                    bonus = 500 - (index - 1) * 100;
                    break;
                case <= 9:
                    bonus = 170 - (index - 5) * 10;
                    break;
                case <=15:
                    bonus = 125 - (index - 10) * 5;
                    break;
                case <= 25:
                    bonus = 96 - (index - 16) * 4;
                    break;
                case <= 50:
                    bonus = 58 - (index - 26) * 2;
                    break;
            }

            await _storeService.AwardPoints(steamid, bonus, $"reached rank index {index}");
        }

        public async Task<List<RankEntryDTO>> GetRankEntries(RankType rankType)
        {
            var rankEntries = await _rankRepository.GetRankEntries(rankType);
            _logger.LogInformation("Got rank entries for {RankType}", rankType.ToString());
            return rankEntries.Select(entry => entry.ToRankEntryDTO()).ToList();
        }

        public async Task UploadRankEntry(RankEntryDTO entry)
        {
            List<RankTowerEntry> towersUsed = entry.Cards.Select(kv => new RankTowerEntry
            {
                TowerKey = kv.Key,
                EncodedData = kv.Value
            }).ToList();
            RankEntry toUpload = new RankEntry
            {
                RankType = RankTypeExtensions.ParseRankType(entry.RankType),
                User = await _userRepository.GetUser(entry.SteamId),
                Version = entry.Version,
                Wave = entry.Wave,
                Damage = entry.Damage,
                TowersUsed = towersUsed,
                UpdateTime = DateTime.Now
            };
            var previousEntry = await _rankRepository.GetRankEntry(toUpload.User.SteamId, toUpload.RankType);
            bool shouldPushNew = true;
            if (previousEntry != null)
            {
                if (previousEntry.Wave < toUpload.Wave)
                {
                    await ResetRank(toUpload.User.SteamId, toUpload.RankType);
                }
                else if (previousEntry.Wave == toUpload.Wave && previousEntry.Damage < toUpload.Damage)
                {
                    await ResetRank(toUpload.User.SteamId, toUpload.RankType);
                }
                else
                {
                    shouldPushNew = false;
                }
            }
            if (shouldPushNew)
            {
                toUpload = await _rankRepository.InsertRankEntry(toUpload);
            }
            List<RankEntry> allEntries = (await _rankRepository.GetRankEntries(toUpload.RankType)).ToList();
            await _userService.UpdateUserAccountDetails(entry.SteamId, entry.UserId, entry.Username);
            await _userService.UpdateUserMaxWave(entry.SteamId, entry.Wave, toUpload.RankType);
            await AwardPointsForEntry(entry.SteamId, toUpload, allEntries);
            _logger.LogInformation("Uploaded a rank entry for {SteamId} on ranking type {RankType}", entry.SteamId, toUpload.RankType.ToString());
        }

        public async Task ResetRank(long steamid, RankType rankType)
        {
            RankEntry entry = await _rankRepository.GetRankEntry(steamid, rankType);
            await _rankRepository.DeleteRankEntry(entry);
            _logger.LogInformation("Reset rank entry for {SteamId} on ranking type {RankType}", steamid, rankType.ToString());
        }
    }
}