using System.ComponentModel.DataAnnotations.Schema;
using System.Security.Cryptography;
using System.Text;

namespace Microsoft.SelfService.Portal.Core.API.Models
{
    public class TemplateVersionModel : BaseModel
    {
        [Column(Order = 1)]
        public Guid TemplateId { get; set; }

        [Column(Order = 2)]
        public string Version { get; set; } = "1.0.0";

        [Column(Order = 3)]
        public string JsonData { get; set; } = "{}";

        [Column(Order = 4)]
        public string JsonHash { get; set; } = string.Empty;

        [Column(Order = 5)]
        public string SchemaVersion { get; set; } = "1.0";

        [Column(Order = 6)]
        public bool IsPublished { get; set; }

        [Column(Order = 7)]
        public DateTime? PublishedAt { get; set; }

        [Column(Order = 8)]
        public string? PublishedBy { get; set; }

        public TemplateModel Template { get; set; } = null!;
        public ICollection<TemplateRevisionModel> TemplateRevisions { get; set; } = new List<TemplateRevisionModel>();

        public void SetJsonData(string jsonData)
        {
            JsonData = string.IsNullOrWhiteSpace(jsonData) ? "{}" : jsonData;
            JsonHash = ComputeSha256(JsonData);
        }

        public static string ComputeSha256(string value)
        {
            var bytes = SHA256.HashData(Encoding.UTF8.GetBytes(value ?? string.Empty));
            return Convert.ToHexString(bytes);
        }
    }
}