import FluentKit
import HummingbirdFluent

/// Reads and creates accounts through the default database.
public struct AccountRepository: Sendable {

    // MARK: Constants

    /// The email of the demo buyer the prototype's stubbed passkey signs in.
    public static let demoEmail = Seed.accounts[0].email

    // MARK: Properties

    private let fluent: Fluent

    // MARK: Initializers

    /// Creates a repository backed by the given `Fluent` service.
    /// - Parameter fluent: the service whose default database the repository operates on.
    public init(
        fluent: Fluent
    ) {
        self.fluent = fluent
    }

    // MARK: Methods

    /// Fetches the account with the given email, creating it when there is none: one step both signs in and joins.
    ///
    /// A new account is named after the email's local part until its owner picks a display name.
    /// - Parameter email: the account's normalized email address.
    /// - Returns: the account, existing or new.
    public func account(
        email: String
    ) async throws -> User {
        if let record = try await UserRecord.query(on: fluent.db())
            .filter(\.$email == email)
            .first()
        {
            return try record.snapshot
        }

        let record = UserRecord(
            email: email,
            displayName: String(email.prefix { $0 != "@" })
        )

        try await record.save(on: fluent.db())

        return try record.snapshot
    }

}