import Foundation

/// Transport boundary. A future URLSession implementation must enforce a finite
/// request timeout and throw HTTP errors before decoding the response body.
@MainActor
protocol LeadRemoteService {
    func fetchLeads(salesCode: String, query: LeadQuery) async throws -> [LeadDTO]
    func fetchLead(id: String, salesCode: String) async throws -> LeadDTO
    func setBookmark(_ bookmarked: Bool, id: String, salesCode: String) async throws -> LeadDTO
}

enum LeadRemoteError: Error {
    case http(statusCode: Int)
    case malformedResponse
}

/// Provisional transport shape, independent of the UI and domain model.
struct LeadDTO: Codable, Sendable {
    let id: String
    let companyName: String?
    let contactTitle: String?
    let firstName: String?
    let lastName: String?
    let street: String?
    let postalCode: String
    let city: String
    let phoneNumber: String?
    let createdAt: Date
    let offerCount: Int
    let unsignedContractCount: Int
    var isBookmarked: Bool

    func toDomain() throws -> Lead {
        func clean(_ value: String?) -> String? {
            guard let text = value?.trimmingCharacters(in: .whitespacesAndNewlines),
                  !text.isEmpty else { return nil }
            return text
        }
        let company = clean(companyName)
        let first = clean(firstName)
        let last = clean(lastName)
        guard clean(id) != nil, company != nil || first != nil || last != nil,
              clean(postalCode) != nil, clean(city) != nil,
              offerCount >= 0, unsignedContractCount >= 0 else {
            throw LeadError.invalidResponse
        }
        let contact = first != nil || last != nil
            ? LeadContact(title: clean(contactTitle), firstName: first ?? "", lastName: last ?? "")
            : nil
        return Lead(
            id: id, companyName: company, contact: contact,
            address: LeadAddress(street: clean(street), postalCode: postalCode, city: city),
            phoneNumber: clean(phoneNumber), createdAt: createdAt,
            offerCount: offerCount, unsignedContractCount: unsignedContractCount,
            isBookmarked: isBookmarked
        )
    }
}