import Foundation

/// One reaction on an issue, a merge request, or one of their comments,
/// as `issue show` and `mr show` carry it.
nonisolated struct ReactionCount: Decodable, Sendable, Hashable, Identifiable {
    let reaction: String
    let count: Int
    /// The signed-in account gave this one.
    let me: Bool

    var id: String { reaction }
}

/// The reaction vocabulary, named as the server stores it. The order is
/// the server's display order, so the picker reads the way the web's does.
nonisolated struct Reaction: Sendable, Hashable, Identifiable {
    let name: String
    let emoji: String

    var id: String { name }

    /// What VoiceOver says; "+1" would be read as "plus one".
    let spoken: String

    static let all: [Reaction] = [
        .init(name: "+1", emoji: "👍", spoken: "thumbs up"), .init(name: "-1", emoji: "👎", spoken: "thumbs down"),
        .init(name: "laugh", emoji: "😄", spoken: "laugh"), .init(name: "hooray", emoji: "🎉", spoken: "hooray"),
        .init(name: "confused", emoji: "😕", spoken: "confused"), .init(name: "heart", emoji: "❤️", spoken: "heart"),
        .init(name: "rocket", emoji: "🚀", spoken: "rocket"), .init(name: "eyes", emoji: "👀", spoken: "eyes"),
    ]

    /// A name a newer server added draws as its name rather than vanishing.
    static func emoji(for name: String) -> String {
        all.first { $0.name == name }?.emoji ?? name
    }

    static func spoken(for name: String) -> String {
        all.first { $0.name == name }?.spoken ?? name
    }

    /// Picking a reaction the account already gave takes it back, the way
    /// the web's toggle does.
    static func remove(_ name: String, given: [ReactionCount]?) -> Bool {
        given?.contains { $0.reaction == name && $0.me } ?? false
    }

    /// `issue react` / `mr react <owner/name> <n> [--comment <id>] <reaction> [--remove]`.
    static func argv(noun: String, repo: String, number: Int64, comment: Int64?,
                     name: String, remove: Bool) -> [String] {
        var argv = [noun, "react", repo, String(number)]
        if let comment { argv += ["--comment", String(comment)] }
        argv.append(name)
        if remove { argv.append("--remove") }
        return argv
    }
}