// retoor <retoor@molodetz.nl>

import Foundation

actor StateManager {
    private struct State: Codable {
        var lastMentionTime: Int
    }

    private let stateURL: URL
    private var state: State

    init() {
        let homeDir = FileManager.default.homeDirectoryForCurrentUser
        let grokiiDir = homeDir.appendingPathComponent(".grokii")

        try? FileManager.default.createDirectory(at: grokiiDir, withIntermediateDirectories: true)

        self.stateURL = grokiiDir.appendingPathComponent("state.json")

        if let data = try? Data(contentsOf: stateURL),
           let loaded = try? JSONDecoder().decode(State.self, from: data) {
            self.state = loaded
        } else {
            self.state = State(lastMentionTime: 0)
        }
    }

    var lastMentionTime: Int {
        state.lastMentionTime
    }

    func updateLastMentionTime(_ time: Int) {
        guard time > state.lastMentionTime else { return }
        state.lastMentionTime = time
        save()
    }

    private func save() {
        guard let data = try? JSONEncoder().encode(state) else { return }
        try? data.write(to: stateURL, options: .atomic)
    }
}