import Foundation

/// Represents a shared card fetched from CloudKit for display in the App Clip.
struct SharedCardSnapshot: Sendable {
    let recordName: String
    let vCardData: String
    let displayName: String
    let role: String
    let company: String
    let photoData: Data?

    init(
        recordName: String,
        vCardData: String,
        displayName: String? = nil,
        role: String? = nil,
        company: String? = nil,
        photoData: Data? = nil
    ) {
        self.recordName = recordName
        self.vCardData = vCardData

        // Parse display fields from vCard
        let lines = vCardData.components(separatedBy: .newlines)
        let parsedDisplayName = Self.parseField("FN:", from: lines) ?? "Contact"
        let parsedRole = Self.parseField("TITLE:", from: lines) ?? ""
        let parsedCompany = Self.parseField("ORG:", from: lines)?
            .components(separatedBy: ";").first ?? ""
        let parsedPhotoData = Self.parsePhoto(from: lines)

        let cleanedDisplayName = displayName?.trimmingCharacters(in: .whitespacesAndNewlines) ?? ""
        self.displayName = cleanedDisplayName.isEmpty ? parsedDisplayName : cleanedDisplayName
        self.role = role ?? parsedRole
        self.company = company ?? parsedCompany
        self.photoData = photoData ?? parsedPhotoData
    }

    private static func parseField(_ prefix: String, from lines: [String]) -> String? {
        lines.first { $0.hasPrefix(prefix) }?
            .dropFirst(prefix.count)
            .trimmingCharacters(in: .whitespaces)
    }

    private static func parsePhoto(from lines: [String]) -> Data? {
        // Find line that starts with PHOTO; and contains base64 data
        guard let photoLine = lines.first(where: { $0.hasPrefix("PHOTO;") }),
              let base64Start = photoLine.range(of: ":")?.upperBound else {
            return nil
        }
        let base64String = String(photoLine[base64Start...])
        return Data(base64Encoded: base64String)
    }
}