import Foundation

struct LeadDetail: Equatable, Sendable {
    let lead: Lead
    let customerType: String
    let contactName: String?
    let contactRole: String?
    let mobile: String?
    let email: String?
    let tankOptions: [LeadTankOption]
    var offers: [LeadOffer]
    let photos: [LeadPhoto]
}

struct LeadTankOption: Identifiable, Equatable, Sendable {
    let id: String
    let title: String
    let tank: Tank
}

struct LeadOffer: Identifiable, Equatable, Sendable {
    let id: String
    let title: String
    let kind: LeadOfferKind
    let amount: Decimal
    let billing: LeadBilling
    let validUntil: Date?
    let acceptedAt: Date?
    var groups: [LeadDocumentGroup]
    var tank: Tank? = nil

    var documents: [LeadDocument] { groups.flatMap(\.documents) }
    var signedCount: Int { documents.filter { $0.status == .signed }.count }
    var isComplete: Bool { !documents.isEmpty && signedCount == documents.count }
}

enum LeadOfferKind: String, Sendable { case purchase, rental, service }
enum LeadBilling: String, Sendable { case once, monthly, annually }

struct LeadDocumentGroup: Identifiable, Equatable, Sendable {
    let id: String
    let title: String
    var documents: [LeadDocument]
    var signedCount: Int { documents.filter { $0.status == .signed }.count }
    var isComplete: Bool { !documents.isEmpty && signedCount == documents.count }
}

struct LeadDocument: Identifiable, Equatable, Sendable {
    let id: String
    let title: String
    let pageCount: Int
    var status: LeadSignatureStatus
    let file: LeadFileReference
    var signaturePlacement: PDFSignaturePlacement? = nil
}

enum LeadSignatureStatus: String, Sendable { case pending, signed }

struct LeadPhoto: Identifiable, Equatable, Sendable {
    let id: String
    let title: String
    let isAR: Bool
    let thumbnail: LeadFileReference
    let original: LeadFileReference
}

struct LeadFileReference: Hashable, Sendable {
    let id: String
    let version: String
    let kind: LeadFileKind
}

enum LeadFileKind: String, Sendable { case pdf, image }

enum LeadFileError: Error, Equatable {
    case notFound, invalidFile, storageUnavailable
}