import Foundation

/// A `Sendable` snapshot of a copy an account is looking for, with the listings that meet it.
public struct Want: Sendable, Equatable {

    // MARK: Properties

    /// The want's identifier.
    public let id: UUID
    /// What is wanted: words that must each appear in a listing's title, e.g. `Nightward #7`.
    public let title: String
    /// The lowest grade wanted, or `nil` for any.
    public let minGrade: Double?
    /// The most the account would pay, in euro cents, or `nil` for any price.
    public let maxPriceCents: Int?
    /// Whether only slabbed copies are wanted.
    public let slabbedOnly: Bool
    /// Whether new matches alert the account.
    public let alerts: Bool
    /// The listings for sale that meet the want, newest first. Wants match within the EU alone.
    public let matches: [Listing]
    /// The number of matches listed since the account last looked at its wants.
    public let newMatchCount: Int

    // MARK: Initializers

    public init(
        id: UUID,
        title: String,
        minGrade: Double?,
        maxPriceCents: Int?,
        slabbedOnly: Bool,
        alerts: Bool,
        matches: [Listing],
        newMatchCount: Int
    ) {
        self.id = id
        self.title = title
        self.minGrade = minGrade
        self.maxPriceCents = maxPriceCents
        self.slabbedOnly = slabbedOnly
        self.alerts = alerts
        self.matches = matches
        self.newMatchCount = newMatchCount
    }

}

// MARK: - Extensions

public extension Want {

    // MARK: Computed

    /// The filter finding the want's matches: the title's words, within the limits set, shipping from the EU.
    var filter: ListingFilter {
        Self.filter(title: title, minGrade: minGrade, maxPriceCents: maxPriceCents, slabbedOnly: slabbedOnly)
    }

    // MARK: Methods

    /// The filter finding a want's matches.
    static func filter(
        title: String,
        minGrade: Double?,
        maxPriceCents: Int?,
        slabbedOnly: Bool
    ) -> ListingFilter {
        .init(
            query: title.replacingOccurrences(of: "·", with: " "),
            isSlabbed: slabbedOnly ? true : nil,
            gradeMin: minGrade,
            priceMax: maxPriceCents,
            shipsFrom: .eu
        )
    }

}