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

namespace QuestionsApi.Models;

public static class DonationStatus
{
    public const string Pending = "pending";
    public const string Paid = "paid";
    public const string Failed = "failed";
    public const string Expired = "expired";
}

public sealed class Donation
{
    [BsonId, BsonRepresentation(BsonType.ObjectId)] public string? Id { get; set; }
    public string UserId { get; set; } = "";
    public long AmountCents { get; set; }
    public string Currency { get; set; } = "usd";
    public string Status { get; set; } = DonationStatus.Pending;
    [BsonIgnoreIfNull] public string? StripeCheckoutSessionId { get; set; }
    public string StripePaymentIntentId { get; set; } = "";
    public string LastStripeEventId { get; set; } = "";
    public string FailureCode { get; set; } = "";
    public DateTime CreatedUtc { get; set; } = DateTime.UtcNow;
    public DateTime UpdatedUtc { get; set; } = DateTime.UtcNow;
    public DateTime? PaidUtc { get; set; }
}

public sealed class CreateDonationCheckoutRequest
{
    public long AmountCents { get; set; }
}

public sealed class DonationCheckoutResponse
{
    public string DonationId { get; set; } = "";
    public string CheckoutUrl { get; set; } = "";
    public long AmountCents { get; set; }
    public string Currency { get; set; } = "usd";
    public string Status { get; set; } = DonationStatus.Pending;
}

public sealed class DonationStatusResponse
{
    public string DonationId { get; set; } = "";
    public long AmountCents { get; set; }
    public string Currency { get; set; } = "usd";
    public string Status { get; set; } = DonationStatus.Pending;
    public DateTime CreatedUtc { get; set; }
    public DateTime? PaidUtc { get; set; }

    public static DonationStatusResponse FromModel(Donation donation) => new()
    {
        DonationId = donation.Id ?? "",
        AmountCents = donation.AmountCents,
        Currency = donation.Currency,
        Status = donation.Status,
        CreatedUtc = donation.CreatedUtc,
        PaidUtc = donation.PaidUtc
    };
}

public static class DonationValidator
{
    public const long MinimumAmountCents = 500;
    public const long MaximumAmountCents = 1_000_000;

    public static string? ValidateAmount(long amountCents) => amountCents switch
    {
        < MinimumAmountCents => "amountCents must be at least 500",
        > MaximumAmountCents => "amountCents must be no more than 1000000",
        _ => null
    };
}