using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;
using System.Text.Json;

namespace Svrnty.Sample.Data.Entities;

/// <summary>
/// Represents an AI agent conversation with message history
/// </summary>
[Table("conversations", Schema = "agent")]
public class Conversation
{
    [Key]
    [Column("id")]
    public Guid Id { get; set; } = Guid.NewGuid();

    /// <summary>
    /// JSON array of messages in the conversation
    /// </summary>
    [Column("messages", TypeName = "jsonb")]
    [Required]
    public string MessagesJson { get; set; } = "[]";

    [Column("created_at")]
    [Required]
    public DateTime CreatedAt { get; set; } = DateTime.UtcNow;

    [Column("updated_at")]
    [Required]
    public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;

    /// <summary>
    /// Convenience property to get/set messages as objects (not mapped to database)
    /// </summary>
    [NotMapped]
    public List<ConversationMessage> Messages
    {
        get => string.IsNullOrEmpty(MessagesJson)
            ? new List<ConversationMessage>()
            : JsonSerializer.Deserialize<List<ConversationMessage>>(MessagesJson) ?? new List<ConversationMessage>();
        set => MessagesJson = JsonSerializer.Serialize(value);
    }
}

/// <summary>
/// Individual message in a conversation
/// </summary>
public class ConversationMessage
{
    public string Role { get; set; } = string.Empty;
    public string Content { get; set; } = string.Empty;
    public DateTime Timestamp { get; set; } = DateTime.UtcNow;
}