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

namespace QuestionsApi.Models;

public static class AppFeedbackCategory
{
    public const string Bug = "bug";
    public const string Usability = "usability";
    public const string FeatureRequest = "feature_request";
    public const string Account = "account";
    public const string Other = "other";
    public static readonly HashSet<string> All = [Bug, Usability, FeatureRequest, Account, Other];
}

public sealed class AppFeedbackContext
{
    public string Screen { get; set; } = "";
    public string SessionType { get; set; } = "";
    public string Platform { get; set; } = "";
    public int ViewportWidth { get; set; }
    public int ViewportHeight { get; set; }
    public string AppVersion { get; set; } = "";
    public string BuildRevision { get; set; } = "";
    public DateTime? ClientUtc { get; set; }
}

public sealed class AppFeedback
{
    [BsonId, BsonRepresentation(BsonType.ObjectId)] public string? Id { get; set; }
    public string UserId { get; set; } = "";
    public string Category { get; set; } = "";
    public string Details { get; set; } = "";
    public AppFeedbackContext Context { get; set; } = new();
    public string Status { get; set; } = QuestionReportStatus.Open;
    public string ReviewedByUserId { get; set; } = "";
    public string ReviewerNote { get; set; } = "";
    public DateTime? ReviewedUtc { get; set; }
    public DateTime CreatedUtc { get; set; } = DateTime.UtcNow;
    public DateTime UpdatedUtc { get; set; } = DateTime.UtcNow;
}

public sealed class CreateAppFeedbackRequest
{
    public string Category { get; set; } = "";
    public string Details { get; set; } = "";
    public AppFeedbackContext Context { get; set; } = new();
}

public sealed class AppFeedbackListResponse
{
    public List<AppFeedback> Items { get; set; } = [];
    public long Total { get; set; }
    public int Skip { get; set; }
    public int Limit { get; set; }
}

public static class AppFeedbackValidator
{
    public const int MinDetailsLength = 10;
    public const int MaxDetailsLength = 4000;
    public const int MaxContextLength = 120;

    public static string? Validate(CreateAppFeedbackRequest request)
    {
        var category = (request.Category ?? "").Trim().ToLowerInvariant();
        var details = (request.Details ?? "").Trim();
        if (!AppFeedbackCategory.All.Contains(category)) return "category is invalid";
        if (details.Length is < MinDetailsLength or > MaxDetailsLength)
            return $"details must be between {MinDetailsLength} and {MaxDetailsLength} characters";
        var context = request.Context ?? new AppFeedbackContext();
        if (context.ViewportWidth < 0 || context.ViewportHeight < 0) return "viewport dimensions cannot be negative";
        if (new[] { context.Screen, context.SessionType, context.Platform, context.AppVersion, context.BuildRevision }
            .Any(value => (value ?? "").Length > MaxContextLength))
            return $"context values must be {MaxContextLength} characters or fewer";
        return null;
    }
}