import Foundation

@MainActor
final class SessionStore: ObservableObject {
    /// Readable from ApiClient (actor) without MainActor hop.
    nonisolated static let defaultApiBase = "https://master.vonas.nl"

    @Published var refreshToken: String?
    @Published var apiBase: String
    @Published var profileId: String?
    @Published var profileName: String?
    @Published var profileAvatarId: String?
    @Published var profileShowAvatar: Bool = true
    @Published var profileAvatarUrl: String?
    @Published var iptvFavoriteIds: Set<Int> = []
    @Published var lastIptvStreamId: Int?

    private let defaults = UserDefaults.standard
    private enum Key {
        static let token = "vmc.tv.refresh_token"
        static let api = "vmc.tv.api_base"
        static let profileId = "vmc.tv.profile_id"
        static let profileName = "vmc.tv.profile_name"
        static let profileAvatar = "vmc.tv.profile_avatar"
        static let profileShowAvatar = "vmc.tv.profile_show_avatar"
        static let profileAvatarUrl = "vmc.tv.profile_avatar_url"
        static let iptvFavorites = "vmc.tv.iptv.favorites"
        static let iptvLastStream = "vmc.tv.iptv.last_stream"
    }

    init() {
        refreshToken = defaults.string(forKey: Key.token)
        apiBase = defaults.string(forKey: Key.api) ?? Self.defaultApiBase
        profileId = defaults.string(forKey: Key.profileId)
        profileName = defaults.string(forKey: Key.profileName)
        profileAvatarId = defaults.string(forKey: Key.profileAvatar)
        let showRaw = defaults.string(forKey: Key.profileShowAvatar)
        profileShowAvatar = showRaw != "0"
        profileAvatarUrl = defaults.string(forKey: Key.profileAvatarUrl)
        let favs = defaults.array(forKey: Key.iptvFavorites) as? [Int] ?? []
        iptvFavoriteIds = Set(favs)
        let last = defaults.integer(forKey: Key.iptvLastStream)
        lastIptvStreamId = last > 0 ? last : nil
    }

    var isAuthed: Bool { !(refreshToken ?? "").isEmpty }
    var hasProfile: Bool { !(profileId ?? "").isEmpty }

    func setToken(_ token: String?) {
        refreshToken = token
        if let token, !token.isEmpty {
            defaults.set(token, forKey: Key.token)
        } else {
            defaults.removeObject(forKey: Key.token)
            setProfile(id: nil, name: nil, avatarId: nil)
        }
    }

    func setApiBase(_ url: String) {
        let clean = url.trimmingCharacters(in: .whitespacesAndNewlines)
            .trimmingCharacters(in: CharacterSet(charactersIn: "/"))
        apiBase = clean.isEmpty ? Self.defaultApiBase : clean
        defaults.set(apiBase, forKey: Key.api)
    }

    func setProfile(
        id: String?,
        name: String?,
        avatarId: String?,
        showAvatar: Bool? = nil,
        avatarUrl: String? = nil
    ) {
        profileId = id
        profileName = name
        profileAvatarId = avatarId
        if let id, !id.isEmpty {
            defaults.set(id, forKey: Key.profileId)
            if let name, !name.isEmpty { defaults.set(name, forKey: Key.profileName) }
            else { defaults.removeObject(forKey: Key.profileName) }
            if let avatarId, !avatarId.isEmpty { defaults.set(avatarId, forKey: Key.profileAvatar) }
            else { defaults.removeObject(forKey: Key.profileAvatar) }
            if let showAvatar {
                profileShowAvatar = showAvatar
                defaults.set(showAvatar ? "1" : "0", forKey: Key.profileShowAvatar)
            }
            if let avatarUrl {
                if avatarUrl.isEmpty {
                    profileAvatarUrl = nil
                    defaults.removeObject(forKey: Key.profileAvatarUrl)
                } else {
                    profileAvatarUrl = avatarUrl
                    defaults.set(avatarUrl, forKey: Key.profileAvatarUrl)
                }
            }
        } else {
            defaults.removeObject(forKey: Key.profileId)
            defaults.removeObject(forKey: Key.profileName)
            defaults.removeObject(forKey: Key.profileAvatar)
            defaults.removeObject(forKey: Key.profileShowAvatar)
            defaults.removeObject(forKey: Key.profileAvatarUrl)
            profileName = nil
            profileAvatarId = nil
            profileShowAvatar = true
            profileAvatarUrl = nil
        }
    }

    func isIptvFavorite(_ streamId: Int) -> Bool {
        iptvFavoriteIds.contains(streamId)
    }

    @discardableResult
    func toggleIptvFavorite(_ streamId: Int) -> Bool {
        if iptvFavoriteIds.contains(streamId) {
            iptvFavoriteIds.remove(streamId)
        } else {
            iptvFavoriteIds.insert(streamId)
        }
        defaults.set(Array(iptvFavoriteIds), forKey: Key.iptvFavorites)
        return iptvFavoriteIds.contains(streamId)
    }

    func setLastIptvStream(_ streamId: Int) {
        lastIptvStreamId = streamId
        defaults.set(streamId, forKey: Key.iptvLastStream)
    }
}