using InboxIntel.Domain.Common;
using InboxIntel.Domain.Enums;

namespace InboxIntel.Domain.Entities;

/// <summary>
/// A single Gmail message stored locally. Designed for 100k+ rows per user:
/// search fields are indexed (see EmailConfiguration) and a generated
/// tsvector column backs PostgreSQL full-text search.
/// </summary>
public class Email : AuditableEntity
{
    public Guid Id { get; set; } = Guid.NewGuid();
    public Guid UserId { get; set; }

    /// <summary>Gmail message id (stable, unique per account).</summary>
    public string GmailMessageId { get; set; } = string.Empty;

    public Guid ThreadId { get; set; }
    public MailThread? Thread { get; set; }

    public Guid SenderId { get; set; }
    public Sender? Sender { get; set; }

    public string? Subject { get; set; }
    public string? Snippet { get; set; }

    /// <summary>Plain-text body. Indexed for FTS via SearchVector.</summary>
    public string? BodyText { get; set; }

    public DateTimeOffset SentAtUtc { get; set; }
    public DateTimeOffset? ReceivedAtUtc { get; set; }

    public long SizeEstimateBytes { get; set; }

    public bool IsUnread { get; set; }
    public bool IsStarred { get; set; }
    public bool IsImportant { get; set; }
    public bool IsInInbox { get; set; }
    public bool IsTrashed { get; set; }
    public bool HasAttachments { get; set; }

    // Unsubscribe signals captured at parse time.
    public bool HasListUnsubscribe { get; set; }
    public string? ListUnsubscribeRaw { get; set; }
    public bool SupportsOneClickUnsubscribe { get; set; }

    /// <summary>Heuristic/AI classification. Defaults to Unknown until classified.</summary>
    public EmailCategory Category { get; set; } = EmailCategory.Unknown;

    /// <summary>
    /// PostgreSQL tsvector, maintained as a generated column. Never set in code;
    /// mapped read-only for querying. Nullable so non-Postgres test providers work.
    /// </summary>
    public NpgsqlTypes.NpgsqlTsVector? SearchVector { get; set; }

    public ICollection<EmailLabel> EmailLabels { get; set; } = new List<EmailLabel>();
    public ICollection<Attachment> Attachments { get; set; } = new List<Attachment>();
}