import Foundation

/// `profile set` — unlike every other filter or edit in the app, `--link`
/// replaces the whole set rather than appending, so every link the form
/// wants to keep is sent on every save. The form is always seeded from
/// the current profile, so every other field is also sent every time,
/// including empty ones: `--description ""` clears, omitting the flag
/// would leave the old value alone.
///
/// The about text is not here. It is a file in `<owner>/.gitbay`, written
/// through the file editor like any other file.
nonisolated struct ProfileEdit: Equatable, Sendable {

    nonisolated struct Link: Equatable, Sendable, Identifiable {
        var id = UUID()
        var label: String
        var url: String
    }

    var description: String
    var website: String
    var links: [Link]

    init(description: String = "", website: String = "", links: [Link] = []) {
        self.description = description
        self.website = website
        self.links = links
    }

    init(from profile: ProfileViewModel.Profile) {
        description = profile.description ?? ""
        website = profile.website ?? ""
        links = (profile.links ?? []).map { Link(label: $0.label ?? "", url: $0.url) }
    }

    /// At most 5 links and every link needs a URL — the server enforces
    /// both, but the form should not let a save reach it that way. A
    /// label may not contain `|` either: the server splits a link on its
    /// first pipe, so a label carrying one would silently corrupt the URL
    /// rather than be rejected.
    var validationError: String? {
        if links.count > 5 { return "At most 5 links." }
        if links.contains(where: { $0.url.trimmingCharacters(in: .whitespaces).isEmpty }) {
            return "A link needs a URL."
        }
        if links.contains(where: { $0.label.contains("|") }) {
            return "A link label can't contain \"|\" — that's what separates it from the URL."
        }
        return nil
    }

    func flags() -> [String] {
        var flags = ["--description", description, "--website", website]
        if links.isEmpty {
            flags += ["--link", ""]
        } else {
            for link in links {
                let label = link.label.trimmingCharacters(in: .whitespaces)
                flags += ["--link", label.isEmpty ? link.url : "\(label)|\(link.url)"]
            }
        }
        return flags
    }
}