squash a bunch of commits

Shogi.Sockets/Repositories/CouchModels/BoardStateDocument.cs

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+using Shogi.Domain;
+
+namespace Shogi.Api.Repositories.CouchModels
+{
+    public class BoardStateDocument : CouchDocument
+	{
+		public string Name { get; set; }
+
+		/// <summary>
+		/// A dictionary where the key is a board-notation position, like D3.
+		/// </summary>
+		public Dictionary<string, Piece?> Board { get; set; }
+
+		public Piece[] Player1Hand { get; set; }
+
+		public Piece[] Player2Hand { get; set; }
+
+		/// <summary>
+		/// Move is null for first BoardState of a session - before anybody has made moves.
+		/// </summary>
+		public Move? Move { get; set; }
+
+		/// <summary>
+		/// Default constructor and setters are for deserialization.
+		/// </summary>
+		public BoardStateDocument() : base(WhichDocumentType.BoardState)
+		{
+			Name = string.Empty;
+			Board = new Dictionary<string, Piece?>(81, StringComparer.OrdinalIgnoreCase);
+			Player1Hand = Array.Empty<Piece>();
+			Player2Hand = Array.Empty<Piece>();
+		}
+
+		public BoardStateDocument(string sessionName, Session shogi)
+			: base($"{sessionName}-{DateTime.Now:O}", WhichDocumentType.BoardState)
+		{
+			static Piece MapPiece(Domain.ValueObjects.Piece piece)
+			{
+				return new Piece { IsPromoted = piece.IsPromoted, Owner = piece.Owner, WhichPiece = piece.WhichPiece };
+			}
+
+			Name = sessionName;
+			Board = shogi.BoardState.State.ToDictionary(kvp => kvp.Key, kvp => kvp.Value == null ? null : MapPiece(kvp.Value));
+
+			Player1Hand = shogi.BoardState.Player1Hand.Select(piece => MapPiece(piece)).ToArray();
+			Player2Hand = shogi.BoardState.Player2Hand.Select(piece => MapPiece(piece)).ToArray();
+		}
+	}
+}

Shogi.Sockets/Repositories/CouchModels/CouchCreatedResult.cs

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+namespace Shogi.Api.Repositories.CouchModels
+{
+  public class CouchCreateResult
+  {
+    public string Id { get; set; }
+    public bool Ok { get; set; }
+    public string Rev { get; set; }
+
+    public CouchCreateResult()
+    {
+      Id = string.Empty;
+      Rev = string.Empty;
+    }
+  }
+}

Shogi.Sockets/Repositories/CouchModels/CouchDocument.cs

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+using Newtonsoft.Json;
+using System;
+
+namespace Shogi.Api.Repositories.CouchModels
+{
+  public abstract class CouchDocument
+  {
+    [JsonProperty("_id")] public string Id { get; set; }
+    [JsonProperty("_rev")] public string? RevisionId { get; set; }
+    public WhichDocumentType DocumentType { get; }
+    public DateTimeOffset CreatedDate { get; set; }
+
+    public CouchDocument(WhichDocumentType documentType)
+      : this(string.Empty, documentType, DateTimeOffset.UtcNow) { }
+
+    public CouchDocument(string id, WhichDocumentType documentType)
+      : this(id, documentType, DateTimeOffset.UtcNow) { }
+
+    public CouchDocument(string id, WhichDocumentType documentType, DateTimeOffset createdDate)
+    {
+      Id = id;
+      DocumentType = documentType;
+      CreatedDate = createdDate;
+    }
+  }
+}

Shogi.Sockets/Repositories/CouchModels/CouchFindResult.cs

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+using System;
+
+namespace Shogi.Api.Repositories.CouchModels
+{
+  internal class CouchFindResult<T>
+  {
+    public T[] docs;
+    public string warning;
+
+    public CouchFindResult()
+    {
+      docs = Array.Empty<T>();
+      warning = "";
+    }
+  }
+}

Shogi.Sockets/Repositories/CouchModels/CouchViewResult.cs

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+using System;
+
+namespace Shogi.Api.Repositories.CouchModels
+{
+  public class CouchViewResult<T> where T : class
+  {
+    public int total_rows;
+    public int offset;
+    public CouchViewResultRow<T>[] rows;
+
+    public CouchViewResult()
+    {
+      rows = Array.Empty<CouchViewResultRow<T>>();
+    }
+  }
+
+  public class CouchViewResultRow<T>
+  {
+    public string id;
+    public T doc;
+
+    public CouchViewResultRow()
+    {
+      id = string.Empty;
+      doc = default!;
+    }
+  }
+}

Shogi.Sockets/Repositories/CouchModels/Move.cs

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+using Shogi.Domain;
+
+namespace Shogi.Api.Repositories.CouchModels
+{
+  public class Move
+  {
+    /// <summary>
+    /// A board coordinate, like A3 or G6. When null, look for PieceFromHand to exist.
+    /// </summary>
+    public string? From { get; set; }
+
+    public bool IsPromotion { get; set; }
+
+    /// <summary>
+    /// The piece placed from the player's hand.
+    /// </summary>
+    public WhichPiece? PieceFromHand { get; set; }
+
+    /// <summary>
+    /// A board coordinate, like A3 or G6.
+    /// </summary>
+    public string To { get; set; }
+
+    /// <summary>
+    /// Default constructor and setters are for deserialization.
+    /// </summary>
+    public Move()
+    {
+      To = string.Empty;
+    }
+  }
+}

Shogi.Sockets/Repositories/CouchModels/Piece.cs

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+using Shogi.Domain;
+
+namespace Shogi.Api.Repositories.CouchModels
+{
+	public class Piece
+	{
+		public bool IsPromoted { get; set; }
+		public WhichPlayer Owner { get; set; }
+		public WhichPiece WhichPiece { get; set; }
+	}
+}

Shogi.Sockets/Repositories/CouchModels/SessionDocument.cs

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+using Shogi.Contracts.Types;
+
+namespace Shogi.Api.Repositories.CouchModels
+{
+  public class SessionDocument : CouchDocument
+  {
+    public string Name { get; set; }
+    public string Player1Id { get; set; }
+    public string? Player2Id { get; set; }
+    public bool IsPrivate { get; set; }
+
+    /// <summary>
+    /// Default constructor and setters are for deserialization.
+    /// </summary>
+    public SessionDocument() : base(WhichDocumentType.Session)
+    {
+      Name = string.Empty;
+      Player1Id = string.Empty;
+      Player2Id = string.Empty;
+    }
+
+    public SessionDocument(SessionMetadata sessionMetaData)
+      : base(sessionMetaData.Name, WhichDocumentType.Session)
+    {
+      Name = sessionMetaData.Name;
+    }
+  }
+}

Shogi.Sockets/Repositories/CouchModels/UserDocument.cs

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+using Shogi.Api.Models;
+
+namespace Shogi.Api.Repositories.CouchModels
+{
+  public class UserDocument : CouchDocument
+  {
+    public string DisplayName { get; set; }
+    public WhichLoginPlatform Platform { get; set; }
+
+    /// <summary>
+    /// Constructor for JSON deserializing.
+    /// </summary>
+    public UserDocument() : base(WhichDocumentType.User)
+    {
+      DisplayName = string.Empty;
+    }
+
+    public UserDocument(
+      string id,
+      string displayName,
+      WhichLoginPlatform platform) : base(id, WhichDocumentType.User)
+    {
+      DisplayName = displayName;
+      Platform = platform;
+    }
+  }
+}

Shogi.Sockets/Repositories/CouchModels/WhichDocumentType.cs

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+namespace Shogi.Api.Repositories.CouchModels
+{
+  public enum WhichDocumentType
+  {
+    User,
+    Session,
+    BoardState
+  }
+}