//
//  LocalData.swift
//  Tusker
//
//  Created by Shadowfacts on 8/18/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import Foundation

class LocalData {
    
    static let shared = LocalData()
    
    let defaults: UserDefaults
    
    private init() {
        if ProcessInfo.processInfo.environment.keys.contains("UI_TESTING") {
            defaults = UserDefaults(suiteName: "\(Bundle.main.bundleIdentifier!).uitesting")!
            if ProcessInfo.processInfo.environment.keys.contains("UI_TESTING_LOGIN") {
                accounts = [
                    UserAccountInfo(
                        instanceURL: URL(string: "http://localhost:8080")!,
                        clientID: "client_id",
                        clientSecret: "client_secret",
                        username: "admin",
                        accessToken: "access_token")
                ]
            }
        } else {
            defaults = UserDefaults()
        }
    }
    
    private let accountsKey = "accounts"
    var accounts: [UserAccountInfo] {
        get {
            if let array = defaults.array(forKey: accountsKey) as? [[String: String]] {
                return array.compactMap { (info) in
                    guard let instanceURL = info["instanceURL"],
                        let url = URL(string: instanceURL),
                        let id = info["clientID"],
                        let secret = info["clientSecret"],
                        let username = info["username"],
                        let accessToken = info["accessToken"] else {
                            return nil
                    }
                    return UserAccountInfo(instanceURL: url, clientID: id, clientSecret: secret, username: username, accessToken: accessToken)
                }
            } else {
                return []
            }
        }
        set {
            let array = newValue.map { (info) in
                return [
                    "instanceURL": info.instanceURL.absoluteString,
                    "clientID": info.clientID,
                    "clientSecret": info.clientSecret,
                    "username": info.username,
                    "accessToken": info.accessToken
                ]
            }
            defaults.set(array, forKey: accountsKey)
        }
    }
    
    private let mostRecentAccountKey = "mostRecentAccount"
    var mostRecentAccount: String? {
        get {
            return defaults.string(forKey: mostRecentAccountKey)
        }
        set {
            defaults.set(newValue, forKey: mostRecentAccountKey)
        }
    }
    
    var onboardingComplete: Bool {
        return !accounts.isEmpty
    }
    
    func addAccount(instanceURL url: URL, clientID id: String, clientSecret secret: String, username: String, accessToken: String) -> UserAccountInfo {
        var accounts = self.accounts
        if let index = accounts.firstIndex(where: { $0.instanceURL == url && $0.username == username }) {
            accounts.remove(at: index)
        }
        let info = UserAccountInfo(instanceURL: url, clientID: id, clientSecret: secret, username: username, accessToken: accessToken)
        accounts.append(info)
        self.accounts = accounts
        return info
    }
    
    func removeAccount(_ info: UserAccountInfo) {
        
    }
    
    func getMostRecentAccount() -> UserAccountInfo? {
        if let accessToken = mostRecentAccount {
            return accounts.first { $0.accessToken == accessToken }
        } else {
            return nil
        }
    }

}

extension LocalData {
    struct UserAccountInfo: Equatable, Hashable {
        let instanceURL: URL
        let clientID: String
        let clientSecret: String
        let username: String
        let accessToken: String
    }
}

extension Notification.Name {
    static let userLoggedOut = Notification.Name("userLoggedOut")
}