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//
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//  URLConvertible+URLRequestConvertible.swift
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//
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//  Copyright (c) 2014-2018 Alamofire Software Foundation (http://alamofire.org/)
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//
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//  Permission is hereby granted, free of charge, to any person obtaining a copy
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//  of this software and associated documentation files (the "Software"), to deal
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//  in the Software without restriction, including without limitation the rights
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//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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//  copies of the Software, and to permit persons to whom the Software is
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//  furnished to do so, subject to the following conditions:
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//
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//  The above copyright notice and this permission notice shall be included in
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//  all copies or substantial portions of the Software.
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//
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//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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//  THE SOFTWARE.
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//
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import Foundation
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/// Types adopting the `URLConvertible` protocol can be used to construct `URL`s, which can then be used to construct
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/// `URLRequests`.
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public protocol URLConvertible {
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    /// Returns a `URL` from the conforming instance or throws.
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    ///
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    /// - Returns: The `URL` created from the instance.
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    /// - Throws:  Any error thrown while creating the `URL`.
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    func asURL() throws -> URL
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}
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extension String: URLConvertible {
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    /// Returns a `URL` if `self` can be used to initialize a `URL` instance, otherwise throws.
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    ///
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    /// - Returns: The `URL` initialized with `self`.
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    /// - Throws:  An `AFError.invalidURL` instance.
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    public func asURL() throws -> URL {
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        guard let url = URL(string: self) else { throw AFError.invalidURL(url: self) }
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        return url
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    }
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}
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extension URL: URLConvertible {
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    /// Returns `self`.
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    public func asURL() throws -> URL { self }
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}
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extension URLComponents: URLConvertible {
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    /// Returns a `URL` if the `self`'s `url` is not nil, otherwise throws.
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    ///
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    /// - Returns: The `URL` from the `url` property.
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    /// - Throws:  An `AFError.invalidURL` instance.
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    public func asURL() throws -> URL {
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        guard let url = url else { throw AFError.invalidURL(url: self) }
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        return url
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    }
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}
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// MARK: -
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/// Types adopting the `URLRequestConvertible` protocol can be used to safely construct `URLRequest`s.
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public protocol URLRequestConvertible {
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    /// Returns a `URLRequest` or throws if an `Error` was encountered.
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    ///
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    /// - Returns: A `URLRequest`.
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    /// - Throws:  Any error thrown while constructing the `URLRequest`.
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    func asURLRequest() throws -> URLRequest
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}
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extension URLRequestConvertible {
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    /// The `URLRequest` returned by discarding any `Error` encountered.
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    public var urlRequest: URLRequest? { try? asURLRequest() }
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}
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extension URLRequest: URLRequestConvertible {
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    /// Returns `self`.
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    public func asURLRequest() throws -> URLRequest { self }
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}
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// MARK: -
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extension URLRequest {
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    /// Creates an instance with the specified `url`, `method`, and `headers`.
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    ///
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    /// - Parameters:
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    ///   - url:     The `URLConvertible` value.
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    ///   - method:  The `HTTPMethod`.
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    ///   - headers: The `HTTPHeaders`, `nil` by default.
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    /// - Throws:    Any error thrown while converting the `URLConvertible` to a `URL`.
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    public init(url: URLConvertible, method: HTTPMethod, headers: HTTPHeaders? = nil) throws {
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        let url = try url.asURL()
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        self.init(url: url)
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        httpMethod = method.rawValue
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        allHTTPHeaderFields = headers?.dictionary
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    }
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}