import Foundation

/// A `Sendable` snapshot of one copy for sale, with the shop selling it.
public struct Listing: Sendable, Equatable {

    // MARK: Properties

    /// The listing's URL slug.
    public let slug: String
    /// The shop selling the copy.
    public let shop: Shop
    /// The listing's title, e.g. `Nightward #1`.
    public let title: String
    /// The series the copy belongs to, e.g. `Nightward (2019 series)`.
    public let seriesTitle: String
    /// The issue or volume, e.g. `#1, cover A`.
    public let issueLabel: String
    /// The publisher's name.
    public let publisher: String
    /// The cover year.
    public let year: Int
    /// The format token, e.g. `single-issues`.
    public let format: String
    /// The printing in a few words, e.g. `1st print`.
    public let printing: String
    /// The printing in full, e.g. `First printing, direct edition`.
    public let printingDetail: String
    /// Whether the copy is a first printing.
    public let isFirstPrint: Bool
    /// The company that graded and slabbed the copy, or `nil` for a raw copy.
    public let grader: String?
    /// The numeric grade, or `nil` for formats that are not graded.
    public let grade: Double?
    /// The condition as the seller states it, e.g. `NM` or `Like new`.
    public let condition: String
    /// The grader's certificate number, or `nil` for a raw copy.
    public let certNumber: String?
    /// The page quality, or `nil` when not stated.
    public let pageQuality: String?
    /// Why the issue is a key, or `nil` when it is not one.
    public let keyNotes: String?
    /// The seller's notes on the copy.
    public let sellerNotes: String
    /// The asking price, in euro cents.
    public let priceCents: Int
    /// The shipping cost to the Netherlands, in euro cents.
    public let shippingCents: Int
    /// Whether the seller takes offers on the copy.
    public let acceptsOffers: Bool
    /// The placeholder cover shown until listings carry photos.
    public let cover: Cover
    /// When the copy was listed.
    public let listedAt: Date

    // MARK: Initializers

    public init(
        slug: String,
        shop: Shop,
        title: String,
        seriesTitle: String,
        issueLabel: String,
        publisher: String,
        year: Int,
        format: String,
        printing: String,
        printingDetail: String,
        isFirstPrint: Bool,
        grader: String?,
        grade: Double?,
        condition: String,
        certNumber: String?,
        pageQuality: String?,
        keyNotes: String?,
        sellerNotes: String,
        priceCents: Int,
        shippingCents: Int,
        acceptsOffers: Bool,
        cover: Cover,
        listedAt: Date
    ) {
        self.slug = slug
        self.shop = shop
        self.title = title
        self.seriesTitle = seriesTitle
        self.issueLabel = issueLabel
        self.publisher = publisher
        self.year = year
        self.format = format
        self.printing = printing
        self.printingDetail = printingDetail
        self.isFirstPrint = isFirstPrint
        self.grader = grader
        self.grade = grade
        self.condition = condition
        self.certNumber = certNumber
        self.pageQuality = pageQuality
        self.keyNotes = keyNotes
        self.sellerNotes = sellerNotes
        self.priceCents = priceCents
        self.shippingCents = shippingCents
        self.acceptsOffers = acceptsOffers
        self.cover = cover
        self.listedAt = listedAt
    }

}

// MARK: - Extensions

public extension Listing {

    // MARK: Computed

    /// Whether the issue is a key.
    var isKey: Bool {
        keyNotes != nil
    }

    /// Whether the copy is graded and slabbed by a grading company.
    var isSlabbed: Bool {
        grader != nil
    }

}

// MARK: - Structs

public extension Listing {
    /// A placeholder cover: lettering on a toned ground.
    struct Cover: Sendable, Equatable {

        // MARK: Properties

        /// The tone token naming the cover's colours, e.g. `navy`.
        public let tone: String
        /// The title lettering, one line per newline.
        public let title: String
        /// The publisher's imprint line.
        public let imprint: String
        /// The issue number or volume marker.
        public let number: String

        // MARK: Initializers

        public init(
            tone: String,
            title: String,
            imprint: String,
            number: String
        ) {
            self.tone = tone
            self.title = title
            self.imprint = imprint
            self.number = number
        }

    }
}