132 lines
3.5 KiB
Swift
132 lines
3.5 KiB
Swift
import Foundation
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/// A `Sendable` snapshot of a conversation between a buyer and a shop, as one of them sees it.
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public struct Conversation: Sendable, Equatable {
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// MARK: Properties
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/// The conversation's identifier.
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public let id: UUID
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/// The account buying.
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public let buyer: User
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/// The shop selling.
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public let shop: Shop
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/// The listing the conversation is about, or `nil` when it is about the shop at large.
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public let listing: Listing?
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/// Which side of the conversation the viewer is on.
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public let side: Side
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/// What was said, offered, and stamped, oldest first.
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public let entries: [Entry]
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/// The number of entries from the other side the viewer has not seen yet.
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public let unreadCount: Int
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/// The number of the sale agreed in the conversation, or `nil` when none was.
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public let saleNumber: Int?
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// MARK: Initializers
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public init(
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id: UUID,
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buyer: User,
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shop: Shop,
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listing: Listing?,
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side: Side,
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entries: [Entry],
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unreadCount: Int,
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saleNumber: Int?
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) {
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self.id = id
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self.buyer = buyer
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self.shop = shop
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self.listing = listing
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self.side = side
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self.entries = entries
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self.unreadCount = unreadCount
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self.saleNumber = saleNumber
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}
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}
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// MARK: - Structs
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public extension Conversation {
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/// One thing in a conversation: something said, an offer made, or an event stamped.
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struct Entry: Sendable, Equatable {
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// MARK: Properties
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/// What the entry is.
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public let kind: Kind
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/// Who wrote the message, made the offer, or caused the event.
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public let sender: User
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/// The message, the offer's note, or the event in a sentence.
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public let body: String
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/// The offer made, for an offer entry.
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public let offer: Offer?
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/// The number of the sale an event opened, or `nil`.
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public let saleNumber: Int?
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/// When the entry was made.
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public let createdAt: Date
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// MARK: Initializers
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public init(
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kind: Kind,
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sender: User,
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body: String,
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offer: Offer? = nil,
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saleNumber: Int? = nil,
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createdAt: Date
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) {
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self.kind = kind
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self.sender = sender
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self.body = body
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self.offer = offer
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self.saleNumber = saleNumber
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self.createdAt = createdAt
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}
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// MARK: Enumerations
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/// What a conversation entry is.
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public enum Kind: String, Sendable {
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/// Something a party wrote.
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case text
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/// An offer, with its optional note.
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case offer
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/// Something that happened: an offer answered, a sale agreed, a step of the handshake taken.
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case event
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}
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}
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}
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// MARK: - Enumerations
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public extension Conversation {
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/// A side of a conversation.
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enum Side: String, Sendable {
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case buying
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case selling
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}
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}
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// MARK: - Extensions
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public extension Conversation {
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// MARK: Computed
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/// The latest entry, or `nil` in a conversation nothing was said in yet.
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var latest: Entry? {
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entries.last
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}
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/// The offer still waiting for an answer, or `nil` when there is none.
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var openOffer: Offer? {
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entries
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.compactMap(\.offer)
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.last { $0.status == .open }
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}
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}
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