using MongoDB.Bson;
using MongoDB.Bson.Serialization.Attributes;

namespace QuestionsApi.Models;

public static class ReviewQueueStates
{
    public const string Pending = "pending";
    public const string Mastered = "mastered";
    public const string Unavailable = "unavailable";
}

public sealed class ReviewQueueItem
{
    [BsonId]
    [BsonRepresentation(BsonType.ObjectId)]
    public string? Id { get; set; }

    public string UserId { get; set; } = "";
    public string QuestionExternalId { get; set; } = "";
    public string SourceAttemptId { get; set; } = "";
    public string State { get; set; } = ReviewQueueStates.Pending;
    public int Cycle { get; set; } = 1;
    public int ReviewCount { get; set; }
    public int IncorrectReviewCount { get; set; }
    public DateTime CreatedUtc { get; set; } = DateTime.UtcNow;
    public DateTime UpdatedUtc { get; set; } = DateTime.UtcNow;
    public DateTime? LastReviewedUtc { get; set; }
    public DateTime? MasteredUtc { get; set; }
}

public sealed class QuestionReviewAttempt
{
    [BsonId]
    public string Id { get; set; } = "";

    public string UserId { get; set; } = "";
    public string QuestionExternalId { get; set; } = "";
    public int Cycle { get; set; }
    public string ChoiceId { get; set; } = "";
    public List<string> PresentedChoiceIds { get; set; } = [];
    public bool IsCorrect { get; set; }
    public int DurationSeconds { get; set; }
    public DateTime CreatedUtc { get; set; } = DateTime.UtcNow;
}

public sealed class ReviewQueueBackfillState
{
    [BsonId]
    public string UserId { get; set; } = "";
    public DateTime CompletedUtc { get; set; } = DateTime.UtcNow;
}

public sealed class ReviewQueueNextRequest
{
    public List<string> ExcludeExternalIds { get; set; } = [];
    public bool SupportsChoicePools { get; set; } = true;
    public string? Step3System { get; set; }
}

public sealed class ReviewQueueNextResponse
{
    public QuestionResponse? Question { get; set; }
    public int Cycle { get; set; }
    public int PendingCount { get; set; }
}

public sealed class ReviewQueueAttemptRequest
{
    public string ClientAttemptId { get; set; } = "";
    public string QuestionExternalId { get; set; } = "";
    public int Cycle { get; set; }
    public string ChoiceId { get; set; } = "";
    public List<string> PresentedChoiceIds { get; set; } = [];
    public int DurationSeconds { get; set; }
}

public sealed class ReviewQueueAttemptResponse
{
    public string QuestionExternalId { get; set; } = "";
    public bool IsCorrect { get; set; }
    public string QueueState { get; set; } = ReviewQueueStates.Pending;
    public int PendingCount { get; set; }
}

public sealed class ReviewQueueRecordResult
{
    public QuestionReviewAttempt Attempt { get; set; } = new();
    public ReviewQueueItem? Item { get; set; }
}