// swift-tools-version:5.0
import PackageDescription

let package = Package(
    dependencies: [
        .package(url: "https://github.com/mindbody/Conduit.git", from: "1.0.0")
    ]
)

// Creates a new URLSessionClient with no persistent cache storage and that fires events on a background queue
let mySessionClient = URLSessionClient(sessionConfiguration: URLSessionConfiguration.ephemeral, delegateQueue: OperationQueue())

class MySessionClientManager {

    /// Lazy-loaded URLSessionClient used for interacting with the Kittn API 🐱
    static let kittnAPISessionClient: URLSessionClient = {
        return URLSessionClient()
    }()

}

/// Example usage ///

var sessionClient = MySessionClientManager.kittnAPISessionClient

// As a copy, this won't mutate the original copy or any other copies
sessionClient.middleware = [MyCustomMiddleware()]

let requestBuilder = HTTPRequestBuilder(url: kittensRequestURL)
requestBuilder.method = .GET
// Can be serialzed via url-encoding, XML, or multipart/form-data
requestBuilder.serializer = JSONRequestSerializer()
// Powerful query string formatting options allow for complex query parameters
requestBuilder.queryStringParameters = [
    "options" : [
        "include" : [
            "fuzzy",
            "fluffy",
            "not mean"
        ],
        "2+2" : 4
    ]
]
requestBuilder.queryStringFormattingOptions.dictionaryFormat = .dotNotated
requestBuilder.queryStringFormattingOptions.arrayFormat = .commaSeparated
requestBuilder.queryStringFormattingOptions.spaceEncodingRule = .replacedWithPlus
requestBuilder.queryStringFormattingOptions.plusSymbolEncodingRule = .replacedWithDecodedPlus

let request = try requestBuilder.build()

let sessionClient = MySessionClientManager.kittnAPISessionClient
sessionClient.begin(request) { (data, response, error) in
    let deserializer = JSONResponseDeserializer()
    let responseDict = try? deserializer.deserialize(response: response, data: data) as? [String : Any]
    ...
}

let serializer = MultipartFormRequestSerializer()
let kittenImage = UIImage(named: "jingles")
let kittenImageFormPart = FormPart(name: "kitten", filename: "mr-jingles.jpg", content: .image(kittenImage, .jpeg(compressionQuality: 0.8)))
let pdfFormPart = FormPart(name: "pedigree", filename: "pedigree.pdf", content: .pdf(pedigreePDFData))
let videoFormPart = FormPart(name: "cat-video", filename: "cats.mov", content: .video(catVideoData, .mov))

serializer.append(formPart: kittenImageFormPart)
serializer.append(formPart: pdfFormPart)
serializer.append(formPart: videoFormPart)

requestBuilder.serializer = serializer

let requestBodyXMLString = "<?xml version=\"1.0\" encoding=\"utf-8\"?><Request>give me cats</Request>"

requestBuilder.requestSerializer = XMLRequestSerializer()
requestBuilder.method = .POST
requestBuilder.bodyParameters = XML(xmlString: requestBodyXMLString)

/// Simple middelware example that logs each outbound request
struct LoggingRequestPipelineMiddleware: RequestPipelineMiddleware {

    public func prepareForTransport(request: URLRequest, completion: @escaping Result<Void>.Block) {
        print("Outbound request: \(request)")
    }

}

mySessionClient.middleware = [LoggingRequestPipelineMiddleware()]

let sslPinningPolicy = SSLPinningServerAuthenticationPolicy(certificates: CertificateBundle.certificatesInBundle) { challenge in
    // All challenges from other hosts will be ignored and will proceed through normal system evaluation
    return challenge.protectionSpace.host == "api.example.com"
}

mySessionClient.serverAuthenticationPolicies = [sslPinningPolicy]

guard let tokenGrantURL = URL(string: "https://api.example.com/oauth2/issue/token") else {
    return
}

let scope = "cats dogs giraffes"
let serverEnvironment = OAuth2ServerEnvironment(scope: scope, tokenGrantURL: tokenGrantURL)

let clientID = "my_oauth2_client"
let clientSecret = "shhhh"

let clientConfiguration = OAuth2ClientConfiguration(clientIdentifier: clientID, clientSecret: clientSecret, environment: serverEnvironment)

// Only for convenience for single-client applications; can be managed elsewhere
Auth.defaultClientConfiguration = clientConfiguration

// Stores user and client tokens to the keychain
let keychainStore = OAuth2KeychainStore(serviceName: "com.company.app-name.oauth-token", accessGroup: "com.company.shared-access-group")

// Stores user and client tokens to UserDefaults or a defined storage location
let diskStore = OAuth2TokenDiskStore(storageMethod: .userDefaults)

// Stores user and client tokens to memory; useful for tests/debugging
let memoryStore = OAuth2TokenMemoryStore()

// Only for convenience for single-client applications; can be managed elsewhere
Auth.defaultTokenStore = keychainStore

// This token grant is most-likely issued on behalf of a user, so the authorization level is "user", and the authorization type is "bearer"
let tokenGrantStrategy = OAuth2PasswordTokenGrantStrategy(username: "[email protected]", password: "hunter2", clientConfiguration: Auth.defaultClientConfiguration)
tokenGrantStrategy.issueToken { result in
    guard case .value(let token) = result else {
        // Handle failure
        return
    }
    let userBearerAuthorization = OAuth2Authorization(type: .bearer, level: .user)
    Auth.defaultTokenStore.store(token: token, for: Auth.defaultClientConfiguration, with: userBearerAuthorization)
    // Handle success
}

// This token grant is issued on behalf of a client, so the authorization level is "client"
let tokenGrantStrategy = OAuth2ClientCredentialsTokenGrantStrategy(clientConfiguration: Auth.defaultClientConfiguration)
tokenGrantStrategy.issueToken { result in
    guard case .value(let token) = result else {
        // Handle failure
        return
    }
    let clientBearerAuthorization = OAuth2Authorization(type: .bearer, level: .client)
    Auth.defaultTokenStore.store(token: token, for: Auth.defaultClientConfiguration, with: clientBearerAuthorization)
    // Handle success
}

// AppDelegate.swift
func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplicationLaunchOptionsKey: Any]?) -> Bool {
    OAuth2AuthorizationRedirectHandler.default.authorizationURLScheme = "x-my-custom-scheme"
    // Other setup
    return true
}

func application(_ app: UIApplication, open url: URL, options: [UIApplicationOpenURLOptionsKey : Any] = [:]) -> Bool {
    if OAuth2AuthorizationRedirectHandler.default.handleOpen(url) {
        return true
    }
    ...
}

// SampleAuthManager.swift

guard let authorizationBaseURL = URL(string: "https://api.example.com/oauth2/authorize"),
    let redirectURI = URL(string: "x-my-custom-scheme://authorize") else {
    return
}
let authorizationStrategy = OAuth2SafariAuthorizationStrategy(presentingViewController: visibleViewController, authorizationRequestEndpoint: authorizationBaseURL)

var authorizationRequest = OAuth2AuthorizationRequest(clientIdentifier: "my_oauth2_client")
authorizationRequest.redirectURI = redirectURI
authorizationRequest.scope = "cats dogs giraffes"
authorizationRequest.state = "abc123"
authorizationRequest.additionalParameters = [
    "custom_param_1" : "value"
]

authorizationStrategy.authorize(request: authorizationRequest) { result in
    guard case .value(let response) = result else {
        // Handle failure
        return
    }
    if response.state != authorizationRequest.state {
        // We've been attacked! 👽
        return
    }
    let tokenGrantStrategy = OAuth2AuthorizationCodeTokenGrantStrategy(code: response.code, redirectURI: redirectURI, clientConfiguration: Auth.defaultClientConfiguration)

    tokenGrantStrategy.issueToken { result in
        // Store token
        // Handle success/failure
    }
}

let requestBuilder = HTTPRequestBuilder(url: protectedKittensRequestURL)
requestBuilder.method = .GET
requestBuilder.serializer = JSONRequestSerializer()
requestBuilder.queryStringParameters = [
    "options" : [
        "include" : [
            "fuzzy",
            "fluffy",
            "not mean"
        ],
        "2+2" : 4
    ]
]
requestBuilder.queryStringFormattingOptions.dictionaryFormat = .dotNotated
requestBuilder.queryStringFormattingOptions.arrayFormat = .commaSeparated
requestBuilder.queryStringFormattingOptions.spaceEncodingRule = .replacedWithPlus
requestBuilder.queryStringFormattingOptions.plusSymbolEncodingRule = .replacedWithDecodedPlus

let request = try requestBuilder.build()

let bearerUserAuthorization = OAuth2Authorization(type: .bearer, level: .user)
let authMiddleware = OAuth2RequestPipelineMiddleware(clientConfiguration: Auth.defaultClientConfiguration, authorization: userBearerAuthorization, tokenStorage: Auth.defaultTokenStore)

var sessionClient = MySessionClientManager.kittnAPISessionClient
// Again, this is a copy, so we're free to mutate the middleware within the copy
sessionClient.middleware.append(authMiddleware)

sessionClient.begin(request) { (data, response, error) in
    let deserializer = JSONResponseDeserializer()
    let responseDict = try? deserializer.deserialize(response: response, data: data) as? [String : Any]
    ...
}