import Foundation

enum RepoCache {
    private static let listKey = "repo.list"
    private static let listFetchedKey = "repo.list.fetchedAt"
    private static let recentsKey = "repo.recents"
    private static let recentsCap = 5
    static let staleAfter: TimeInterval = 24 * 60 * 60

    static var repos: [GiteaRepo] {
        get {
            guard let data = AppSettings.localDefaults.data(forKey: listKey) else { return [] }
            let decoder = JSONDecoder()
            decoder.dateDecodingStrategy = .iso8601
            return (try? decoder.decode([GiteaRepo].self, from: data)) ?? []
        }
        set {
            let encoder = JSONEncoder()
            encoder.dateEncodingStrategy = .iso8601
            if let data = try? encoder.encode(newValue) {
                AppSettings.localDefaults.set(data, forKey: listKey)
                AppSettings.localDefaults.set(Date(), forKey: listFetchedKey)
            }
        }
    }

    static var fetchedAt: Date? {
        AppSettings.localDefaults.object(forKey: listFetchedKey) as? Date
    }

    static var isStale: Bool {
        guard let fetched = fetchedAt else { return true }
        return Date().timeIntervalSince(fetched) > staleAfter
    }

    static var recentFullNames: [String] {
        AppSettings.localDefaults.stringArray(forKey: recentsKey) ?? []
    }

    static func touch(_ fullName: String) {
        var current = recentFullNames.filter { $0 != fullName }
        current.insert(fullName, at: 0)
        if current.count > recentsCap { current = Array(current.prefix(recentsCap)) }
        AppSettings.localDefaults.set(current, forKey: recentsKey)
    }
}