//
//  AppOnlyClient.swift
//  Swifter
//
//  Copyright (c) 2014 Matt Donnelly.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation

internal class AppOnlyClient: SwifterClientProtocol  {

    var consumerKey: String
    var consumerSecret: String

    var credential: Credential?

    let dataEncoding: String.Encoding = .utf8

    init(consumerKey: String, consumerSecret: String) {
        self.consumerKey = consumerKey
        self.consumerSecret = consumerSecret
    }

    func get(_ path: String,
			 baseURL: TwitterURL,
			 parameters: [String: Any],
			 uploadProgress: HTTPRequest.UploadProgressHandler?,
			 downloadProgress: HTTPRequest.DownloadProgressHandler?,
			 success: HTTPRequest.SuccessHandler?,
			 failure: HTTPRequest.FailureHandler?) -> HTTPRequest {
        let url = URL(string: path, relativeTo: baseURL.url)

        let request = HTTPRequest(url: url!, method: .GET, parameters: parameters)
        request.downloadProgressHandler = downloadProgress
        request.successHandler = success
        request.failureHandler = failure
        request.dataEncoding = self.dataEncoding

        if let bearerToken = self.credential?.accessToken?.key {
            request.headers = ["Authorization": "Bearer \(bearerToken)"];
        }

        request.start()
        return request
    }

    func post(_ path: String,
			  baseURL: TwitterURL,
			  parameters: [String: Any],
			  uploadProgress: HTTPRequest.UploadProgressHandler?,
			  downloadProgress: HTTPRequest.DownloadProgressHandler?,
			  success: HTTPRequest.SuccessHandler?,
			  failure: HTTPRequest.FailureHandler?) -> HTTPRequest {
        let url = URL(string: path, relativeTo: baseURL.url)

        let request = HTTPRequest(url: url!, method: .POST, parameters: parameters)
        request.downloadProgressHandler = downloadProgress
        request.successHandler = success
        request.failureHandler = failure
        request.dataEncoding = self.dataEncoding

        if let bearerToken = self.credential?.accessToken?.key {
            request.headers = ["Authorization": "Bearer \(bearerToken)"];
        } else {
            let basicCredentials = AppOnlyClient.base64EncodedCredentials(withKey: self.consumerKey, secret: self.consumerSecret)
            request.headers = ["Authorization": "Basic \(basicCredentials)"];
            request.encodeParameters = true
        }

        request.start()
        return request
    }
	
	func delete(_ path: String,
				baseURL: TwitterURL,
				parameters: [String: Any],
				success: HTTPRequest.SuccessHandler?,
				failure: HTTPRequest.FailureHandler?) -> HTTPRequest {
		let url = URL(string: path, relativeTo: baseURL.url)
		
		let request = HTTPRequest(url: url!, method: .DELETE, parameters: parameters)
		request.successHandler = success
		request.failureHandler = failure
		request.dataEncoding = self.dataEncoding
		
		if let bearerToken = self.credential?.accessToken?.key {
			request.headers = ["Authorization": "Bearer \(bearerToken)"];
		}
		
		request.start()
		return request
	}

    class func base64EncodedCredentials(withKey key: String, secret: String) -> String {
        let encodedKey = key.urlEncodedString()
        let encodedSecret = secret.urlEncodedString()
        let bearerTokenCredentials = "\(encodedKey):\(encodedSecret)"
        guard let data = bearerTokenCredentials.data(using: .utf8) else {
            return ""
        }
        return data.base64EncodedString(options: [])
    }

}
