using System.ComponentModel.DataAnnotations;

namespace GerbilManagerWebAPI.Models
{
    /// <summary>
    /// FEEDBACK: a user-submitted "Fehler melden" report. Decoupled from the rest of the
    /// model on purpose — GerbilId/LitterId are plain nullable Guid columns (NOT enforced
    /// foreign keys), so the import re-ingest wipe (IngestResolvedService) can delete
    /// gerbils/litters without deleting or breaking feedback rows. The captured EntityName
    /// keeps the report human-readable even after the referenced animal is gone.
    /// </summary>
    public class Feedback
    {
        [Key]
        public Guid Id { get; set; }

        /// <summary>The user's free-text description of the problem.</summary>
        public required string Message { get; set; }

        /// <summary>Which view the report came from: stammbaum | gerbil-detail | litter-detail.</summary>
        public required string Context { get; set; }

        /// <summary>Loose reference (no FK) to the gerbil the report is about, if any.</summary>
        public Guid? GerbilId { get; set; }

        /// <summary>Loose reference (no FK) to the litter the report is about, if any.</summary>
        public Guid? LitterId { get; set; }

        /// <summary>Loose reference (no FK) to the contact the report is about, if any.</summary>
        public Guid? ContactId { get; set; }

        /// <summary>Captured name of the referenced animal/litter (survives an ingest wipe).</summary>
        public string? EntityName { get; set; }

        /// <summary>The client URL/route the report was filed from.</summary>
        public string? Url { get; set; }

        /// <summary>Client-supplied timestamp (when the user submitted, in their browser).</summary>
        public DateTimeOffset? ClientTimestamp { get; set; }

        /// <summary>Optional browser user-agent for diagnostics.</summary>
        public string? UserAgent { get; set; }

        /// <summary>Server-side creation time.</summary>
        public DateTimeOffset CreatedAt { get; set; }

        /// <summary>
        /// Ticket lifecycle status: "Open" | "NeedsInfo" | "Answered" | "Resolved" (default "Open").
        /// "NeedsInfo" = a maintainer attached a clarifying question (Rückfrage) and is waiting on
        /// the breeder; "Answered" = the breeder replied. Plain string, no FK — keeps feedback
        /// decoupled and ingest-surviving like the rest of the row.
        /// </summary>
        public string Status { get; set; } = "Open";

        /// <summary>When the ticket was marked resolved; null while open.</summary>
        public DateTimeOffset? ResolvedAt { get; set; }

        /// <summary>
        /// When the ticket was reopened FROM a resolved state that had no pending Rückfrage —
        /// i.e. a genuinely-fixed ticket the breeder wants reworked. Stays null for tickets that
        /// merely had an open question, got marked resolved, and were reopened (those just return
        /// to their existing Rückfrage). Shown as "Wieder geöffnet am" in the UI.
        /// </summary>
        public DateTimeOffset? ReopenedAt { get; set; }

        /// <summary>
        /// SOFT-DELETE: when the breeder deleted the ticket via the UI. Soft-deleted tickets are
        /// NOT removed from the DB — they move into the "Gelöscht" category and can be restored
        /// (DeletedAt → null) from there. null = not deleted.
        /// </summary>
        public DateTimeOffset? DeletedAt { get; set; }

        /// <summary>A clarifying question (Rückfrage) a maintainer attaches to the ticket; null if none.</summary>
        public string? Question { get; set; }

        /// <summary>The breeder's (Züchterin) reply to the clarifying question; null until answered.</summary>
        public string? Answer { get; set; }

        /// <summary>When the breeder answered the clarifying question; null until answered.</summary>
        public DateTimeOffset? AnsweredAt { get; set; }

        /// <summary>
        /// FIX-NOTE: a breeder-friendly changelog written when the ticket is resolved — plain
        /// language ("was sich für SIE sichtbar geändert hat"), no technical jargon. Shown in the
        /// "Geschlossen" view. null while the ticket is open / unresolved.
        /// </summary>
        public string? FixNote { get; set; }

        /// <summary>
        /// AGENT-CONTEXT (INTERNAL): the maintainer/agent's working memory — findings, suspected
        /// cause, files/data touched, the plan, what it is waiting on. MAY contain ids/filenames.
        /// Returned by the DTO for tooling, but NEVER rendered in the breeder UI. null if unused.
        /// </summary>
        public string? AgentContext { get; set; }

        /// <summary>
        /// THREAD/HISTORY: a JSON array of past Q&A turns so earlier rounds aren't lost when a new
        /// question is asked. Each entry: { "role": "maintainer" | "breeder", "text": string,
        /// "at": ISO-8601 string }. The current open exchange stays in Question/Answer; when a NEW
        /// question is set while a previous Q&A exists, the previous (question, answer) is appended
        /// here first. Plain string column (no FK) so it survives the ingest wipe. null/empty = no history.
        /// </summary>
        public string? Thread { get; set; }
    }
}