<commit_before>//
//  Capability.swift
//  Operations
//
//  Created by <NAME> on 01/10/2015.
//  Copyright © 2015 <NAME>. All rights reserved.
//

import Foundation

/// Public type for capabilities
public struct Capability { }

// MARK: CapabilityType

public protocol AuthorizationStatusType {
    typealias Requirement

    func isRequirementMet(requirement: Requirement) -> Bool
}

public protocol CapabilityRegistrarType {
    init()
}

public protocol CapabilityType {
    typealias Registrar: CapabilityRegistrarType
    typealias Status: AuthorizationStatusType

    var name: String { get }
    var requirement: Status.Requirement { get }

    init(_ requirement: Status.Requirement, registrar: Registrar)
    func isAvailable() -> Bool
    func authorizationStatus(completion: Status -> Void)
    func requestAuthorizationWithCompletion(completion: dispatch_block_t)
}

extension Capability {

    public struct VoidStatus: AuthorizationStatusType {
        public func isRequirementMet(requirement: Void) -> Bool {
            return true
        }
    }
}

// MARK: - Operations

public class GetAuthorizationStatus<Capability: CapabilityType>: Operation {

    public typealias StatusResponse = (Bool, Capability.Status)
    public typealias Completion = StatusResponse -> Void

    public var isAvailable: Bool? = .None
    public var status: Capability.Status? = .None

    let capability: Capability
    let completion: Completion

    public init(_ capability: Capability, completion: Completion = { _ in }) {
        self.capability = capability
        self.completion = completion
        super.init()
        name = "Get Authorization Status for: \(capability.name)"
    }

    func determineState(completion: StatusResponse -> Void) {
        isAvailable = capability.isAvailable()
        capability.authorizationStatus { status in
            self.status = status
            completion((self.isAvailable!, self.status!))
        }
    }

    public override func execute() {
        determineState { response in
            self.completion(response)
            self.finish()
        }
    }
}

public class Authorize<Capability: CapabilityType>: GetAuthorizationStatus<Capability> {

    public override init(_ capability: Capability, completion: Completion = { _ in }) {
        super.init(capability, completion: completion)
        name = "Authorize \(capability.requirement) for: \(capability.name)"
        addCondition(MutuallyExclusive<Capability>())
    }

    public override func execute() {
        capability.requestAuthorizationWithCompletion {
            super.execute()
        }
    }
}

// MARK: - Condition

public enum CapabilityError<Capability: CapabilityType>: ErrorType {
    case NotAvailable
    case AuthorizationNotGranted((Capability.Status, Capability.Status.Requirement?))
}

public struct AuthorizedFor<Capability: CapabilityType>: OperationCondition {

    public let name: String
    public let isMutuallyExclusive = false

    let capability: Capability

    public init(_ capability: Capability) {
        self.capability = capability<commit_msg>[OPR-108]: Tweaks names of Capability<commit_after>//
//  Capability.swift
//  Operations
//
//  Created by <NAME> on 01/10/2015.
//  Copyright © 2015 <NAME>. All rights reserved.
//

import Foundation

/// Public type for capabilities
public struct Capability { }

// MARK: CapabilityType

public protocol AuthorizationStatusType {
    typealias Requirement

    func isRequirementMet(requirement: Requirement) -> Bool
}

public protocol CapabilityRegistrarType {
    init()
}

public protocol CapabilityType {
    typealias Registrar: CapabilityRegistrarType
    typealias Status: AuthorizationStatusType

    var name: String { get }
    var requirement: Status.Requirement { get }

    init(_ requirement: Status.Requirement, registrar: Registrar)
    func isAvailable() -> Bool
    func authorizationStatus(completion: Status -> Void)
    func requestAuthorizationWithCompletion(completion: dispatch_block_t)
}

extension Capability {

    public struct VoidStatus: AuthorizationStatusType {
        public func isRequirementMet(requirement: Void) -> Bool {
            return true
        }
    }
}

// MARK: - Operations

public class GetAuthorizationStatus<Capability: CapabilityType>: Operation {

    public typealias StatusResponse = (Bool, Capability.Status)
    public typealias Completion = StatusResponse -> Void

    public var isAvailable: Bool? = .None
    public var status: Capability.Status? = .None

    let capability: Capability
    let completion: Completion

    public init(_ capability: Capability, completion: Completion = { _ in }) {
        self.capability = capability
        self.completion = completion
        super.init()
        name = "Get Authorization Status for \(capability.name)"
    }

    func determineState(completion: StatusResponse -> Void) {
        isAvailable = capability.isAvailable()
        capability.authorizationStatus { status in
            self.status = status
            completion((self.isAvailable!, self.status!))
        }
    }

    public override func execute() {
        determineState { response in
            self.completion(response)
            self.finish()
        }
    }
}

public class Authorize<Capability: CapabilityType>: GetAuthorizationStatus<Capability> {

    public override init(_ capability: Capability, completion: Completion = { _ in }) {
        super.init(capability, completion: completion)
        name = "Authorize \(capability.name).\(capability.requirement)"
        addCondition(MutuallyExclusive<Capability>())
    }

    public override func execute() {
        capability.requestAuthorizationWithCompletion {
            super.execute()
        }
    }
}

// MARK: - Condition

public enum CapabilityError<Capability: CapabilityType>: ErrorType {
    case NotAvailable
    case AuthorizationNotGranted((Capability.Status, Capability.Status.Requirement?))
}

public struct AuthorizedFor<Capability: CapabilityType>: OperationCondition {

    public let name: String
    public let isMutuallyExclusive = false

    let capability: Capability

    public init(_ capability: Capability) {
        self.capability = capability
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