import Foundation

/// A typed value with a vCard `TYPE` label, e.g. a `WORK` phone number.
public struct LabeledValue: Sendable, Equatable {
    /// Already normalised to a vCard TYPE token: `HOME`, `WORK`, `CELL`, …
    public var label: String
    public var value: String

    public init(label: String, value: String) {
        self.label = label
        self.value = value
    }
}

/// A postal address, held as the components vCard's `ADR` expects.
public struct PostalAddress: Sendable, Equatable {
    public var label: String
    public var street: String
    public var city: String
    public var state: String
    public var postalCode: String
    public var country: String

    public init(
        label: String,
        street: String = "",
        city: String = "",
        state: String = "",
        postalCode: String = "",
        country: String = ""
    ) {
        self.label = label
        self.street = street
        self.city = city
        self.state = state
        self.postalCode = postalCode
        self.country = country
    }
}

/// A contact reduced to the fields a click-wheel iPod can actually display.
///
/// Deliberately has no notes field. `CNContactNoteKey` has required the
/// restricted `com.apple.developer.contacts.notes` entitlement since macOS 11,
/// and fetching with it unentitled throws — so notes are never read.
public struct IPodContact: Sendable, Equatable, Identifiable {
    public var id: String
    public var namePrefix: String
    public var givenName: String
    public var middleName: String
    public var familyName: String
    public var nameSuffix: String
    public var organization: String
    public var jobTitle: String
    public var phoneNumbers: [LabeledValue]
    public var emailAddresses: [LabeledValue]
    public var postalAddresses: [PostalAddress]
    public var birthday: DateComponents?

    public init(
        id: String = UUID().uuidString,
        namePrefix: String = "",
        givenName: String = "",
        middleName: String = "",
        familyName: String = "",
        nameSuffix: String = "",
        organization: String = "",
        jobTitle: String = "",
        phoneNumbers: [LabeledValue] = [],
        emailAddresses: [LabeledValue] = [],
        postalAddresses: [PostalAddress] = [],
        birthday: DateComponents? = nil
    ) {
        self.id = id
        self.namePrefix = namePrefix
        self.givenName = givenName
        self.middleName = middleName
        self.familyName = familyName
        self.nameSuffix = nameSuffix
        self.organization = organization
        self.jobTitle = jobTitle
        self.phoneNumbers = phoneNumbers
        self.emailAddresses = emailAddresses
        self.postalAddresses = postalAddresses
        self.birthday = birthday
    }

    /// The `FN` value, and the basis for the contact's filename.
    public var displayName: String {
        let parts = [namePrefix, givenName, middleName, familyName, nameSuffix]
            .filter { !$0.isEmpty }
        if !parts.isEmpty { return parts.joined(separator: " ") }
        if !organization.isEmpty { return organization }
        if let email = emailAddresses.first?.value, !email.isEmpty { return email }
        return "Contact"
    }

    /// True when the contact carries nothing worth putting on the device.
    public var isEmpty: Bool {
        phoneNumbers.isEmpty
            && emailAddresses.isEmpty
            && postalAddresses.isEmpty
            && organization.isEmpty
            && givenName.isEmpty
            && familyName.isEmpty
    }
}

/// A single dated occurrence, already expanded out of any recurrence rule.
///
/// Times are absolute `Date`s here; they are rendered as *floating* local times
/// at write time, because click-wheel iPods have no timezone database and
/// reject or misread `TZID`-qualified values.
public struct IPodEvent: Sendable, Equatable, Identifiable {
    public var id: String
    public var uid: String
    public var summary: String
    public var location: String
    public var notes: String
    public var start: Date
    public var end: Date
    public var isAllDay: Bool
    public var calendarTitle: String

    public init(
        id: String = UUID().uuidString,
        uid: String,
        summary: String,
        location: String = "",
        notes: String = "",
        start: Date,
        end: Date,
        isAllDay: Bool = false,
        calendarTitle: String = ""
    ) {
        self.id = id
        self.uid = uid
        self.summary = summary
        self.location = location
        self.notes = notes
        self.start = start
        self.end = end
        self.isAllDay = isAllDay
        self.calendarTitle = calendarTitle
    }
}