using System.Xml.Serialization;
using Application.Common.Extensions;
using Application.Common.Helpers;
using Application.Common.Models;
using Application.Dto;
using Application.Interfaces;
using Application.Mappers;
using Microsoft.EntityFrameworkCore;

namespace Application.Game.Rank;

public record GetGlobalScoreRankQuery(string Param) : IRequestWrapper<string>;

public class GetGlobalScoreRankQueryHandler : IRequestHandlerWrapper<GetGlobalScoreRankQuery, string>
{
    private readonly ICardDbContext cardDbContext;

    public GetGlobalScoreRankQueryHandler(ICardDbContext cardDbContext)
    {
        this.cardDbContext = cardDbContext;
    }

    public async Task<ServiceResult<string>> Handle(GetGlobalScoreRankQuery request, CancellationToken cancellationToken)
    {
        var param = request.Param.DeserializeCardData<RankParam>();
        if (param.CardId == 0)
        {
            return await GetAllRanks(cancellationToken);
        }
        return await GetCardRank(param.CardId, cancellationToken);
    }

    private async Task<ServiceResult<string>> GetCardRank(long cardId,
        CancellationToken cancellationToken)
    {
        var rank = await cardDbContext.GlobalScoreRanks.FirstOrDefaultAsync(scoreRank => scoreRank.CardId == cardId, 
            cancellationToken: cancellationToken);
        GlobalScoreRankContainer container;
        if (rank is null)
        {
            container = new GlobalScoreRankContainer
            {
                Ranks = new List<ScoreRankDto>(),
                Status = new RankStatus
                {
                    TableName = "GlobalScoreRank",
                    StartDate = TimeHelper.DateToString(DateTime.Today),
                    EndDate = TimeHelper.DateToString(DateTime.Today),
                    Rows = 1,
                    Status = 1
                }
            };
            return new ServiceResult<string>(container.SerializeCardData());
        }

        var dto = rank.ScoreRankToDto();
        dto.Id = 0;
        container = new GlobalScoreRankContainer
        {
            Ranks = new List<ScoreRankDto>
            {
                dto
            },
            Status = new RankStatus
            {
                TableName = "GlobalScoreRank",
                StartDate = TimeHelper.DateToString(DateTime.Today),
                EndDate = TimeHelper.DateToString(DateTime.Today),
                Rows = 1,
                Status = 1
            }
        };
        return new ServiceResult<string>(container.SerializeCardData());
    }

    private async Task<ServiceResult<string>> GetAllRanks(CancellationToken cancellationToken)
    {
        var ranks = await cardDbContext.GlobalScoreRanks.OrderBy(rank => rank.Rank)
            .Take(30).ToListAsync(cancellationToken: cancellationToken);

        var dtoList = ranks.Select((rank, i) =>
        {
            var dto = rank.ScoreRankToDto();
            dto.Id = i;
            dto.Rank2 = dto.Rank;
            return dto;
        }).ToList();

        var container = new GlobalScoreRankContainer
        {
            Ranks = dtoList,
            Status = new RankStatus
            {
                TableName = "GlobalScoreRank",
                StartDate = TimeHelper.DateToString(DateTime.Today),
                EndDate = TimeHelper.DateToString(DateTime.Today),
                Rows = dtoList.Count,
                Status = 1
            }
        };

        return new ServiceResult<string>(container.SerializeCardData());
    }
}

[XmlRoot("root")]
public class GlobalScoreRankContainer
{
    [XmlArray(ElementName = "score_rank")]
    [XmlArrayItem(ElementName = "record")]
    // ReSharper disable once UnusedAutoPropertyAccessor.Global
    public List<ScoreRankDto> Ranks { get; init; } = new();

    [XmlElement("ranking_status")] 
    public RankStatus Status { get; set; } = new();
}