using System.Text.Json;
using SVSim.Database;
using SVSim.Database.Models;
using SVSim.Database.Repositories.Globals;
using SVSim.Database.Repositories.Viewer;
using SVSim.Database.Services;
using SVSim.EmulatedEntrypoint.Models.Dtos.Common.ArenaTwoPick;
using SVSim.EmulatedEntrypoint.Models.Dtos.Responses.ArenaTwoPick;

namespace SVSim.EmulatedEntrypoint.Services;

public class ArenaTwoPickService : IArenaTwoPickService
{
    private readonly IArenaTwoPickRunRepository _runs;
    private readonly IArenaTwoPickRewardRepository _rewards;
    private readonly IArenaTwoPickCardPoolService _pool;
    private readonly IGameConfigService _config;
    private readonly IViewerRepository _viewers;
    private readonly RewardGrantService _grants;
    private readonly IViewerEntitlements _entitlements;
    private readonly IRandom _rng;
    private readonly SVSimDbContext _db;

    public ArenaTwoPickService(
        IArenaTwoPickRunRepository runs,
        IArenaTwoPickRewardRepository rewards,
        IArenaTwoPickCardPoolService pool,
        IGameConfigService config,
        IViewerRepository viewers,
        RewardGrantService grants,
        IViewerEntitlements entitlements,
        IRandom rng,
        SVSimDbContext db)
    {
        _runs = runs; _rewards = rewards; _pool = pool; _config = config;
        _viewers = viewers; _grants = grants; _entitlements = entitlements; _rng = rng; _db = db;
    }

    public async Task<TopResponseDto> GetTopAsync(long viewerId)
    {
        var run = await _runs.GetByViewerIdAsync(viewerId);
        if (run is null) return new TopResponseDto { EntryInfo = null };

        var dto = new TopResponseDto
        {
            EntryInfo = ProjectEntryInfo(run, viewerId),
            BattleResults = ProjectBattleResults(run),
        };
        if (run.ClassId != 0)
        {
            dto.ClassInfo = ProjectClassInfo(run);
            dto.DeckInfo = ProjectDeckInfo(run);
            if (run.WinCount > 0 || run.LossCount > 0)
                dto.LeaderSkinId = run.LeaderSkinId;
        }
        return dto;
    }

    public Task<EntryResponseDto> EntryAsync(long viewerId, int consumeItemType) => throw new NotImplementedException();
    public Task<ClassChooseResponseDto> ChooseClassAsync(long viewerId, int classId) => throw new NotImplementedException();
    public Task<CardChooseResponseDto> ChooseCardAsync(long viewerId, long selectedId) => throw new NotImplementedException();
    public Task<FinishResponseDto> RetireAsync(long viewerId) => throw new NotImplementedException();
    public Task<FinishResponseDto> FinishAsync(long viewerId) => throw new NotImplementedException();
    public Task<BattleFinishResultDto> RecordBattleResultAsync(long viewerId, bool isWin) => throw new NotImplementedException();

    // --- projection helpers (kept internal so test subclasses could exercise if needed) ---

    internal static EntryInfoDto ProjectEntryInfo(ViewerArenaTwoPickRun run, long viewerId) => new()
    {
        Id = run.EntryId,
        ViewerId = viewerId,
        RewardScheduleId = run.RewardScheduleId,
        ChallengeId = run.ChallengeId,
        MaxBattleCount = run.MaxBattleCount,
        LeaderSkinId = run.LeaderSkinId,
        IsRetire = run.IsRetire ? 1 : 0,
    };

    internal static BattleResultsDto ProjectBattleResults(ViewerArenaTwoPickRun run)
    {
        var bools = JsonSerializer.Deserialize<List<bool>>(run.ResultListJson) ?? new();
        return new()
        {
            ResultList = bools.Select(b => b ? 1 : 0).ToList(),
            WinCount = run.WinCount,
        };
    }

    internal static ClassInfoDto ProjectClassInfo(ViewerArenaTwoPickRun run)
    {
        var ids = JsonSerializer.Deserialize<List<int>>(run.CandidateClassIdsJson) ?? new();
        return new()
        {
            ClassId1 = ids.ElementAtOrDefault(0),
            ClassId2 = ids.ElementAtOrDefault(1),
            ClassId3 = ids.ElementAtOrDefault(2),
            SelectedClassId = run.ClassId,
        };
    }

    internal static DeckInfoDto ProjectDeckInfo(ViewerArenaTwoPickRun run)
    {
        var cards = JsonSerializer.Deserialize<List<long>>(run.SelectedCardIdsJson) ?? new();
        return new()
        {
            TwoPickEntryId = run.EntryId,
            ClassId = run.ClassId,
            IsSelectCompleted = run.IsSelectCompleted,
            SelectedCardIds = cards,
            SelectTurn = run.SelectTurn == 0 ? 1 : run.SelectTurn,
        };
    }
}