Alamofire/Example/DetailViewController.swift

// DetailViewController.swift
//
// Copyright (c) 2014–2015 Alamofire Software Foundation (http://alamofire.org/)
//
// 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 Alamofire
import UIKit

class DetailViewController: UITableViewController {
    enum Sections: Int {
        case Headers, Body
    }

    var request: Alamofire.Request? {
        didSet {
            oldValue?.cancel()

            self.title = self.request?.description
            self.refreshControl?.endRefreshing()
            self.headers.removeAll()
            self.body = nil
            self.elapsedTime = nil
        }
    }

    var headers: [String: String] = [:]
    var body: String?
    var elapsedTime: NSTimeInterval?
    var segueIdentifier: String?

    static let numberFormatter: NSNumberFormatter = {
        let formatter = NSNumberFormatter()
        formatter.numberStyle = .DecimalStyle
        return formatter
    }()

    // MARK: View Lifecycle

    override func awakeFromNib() {
        super.awakeFromNib()
        self.refreshControl?.addTarget(self, action: "refresh", forControlEvents: .ValueChanged)

    }

    override func viewDidAppear(animated: Bool) {
        super.viewDidAppear(animated)

        self.refresh()
    }

    // MARK: IBActions

    @IBAction func refresh() {
        if self.request == nil {
            return
        }

        self.refreshControl?.beginRefreshing()

        let start = CACurrentMediaTime()
        self.request?.responseString { request, response, body, error in
            let end = CACurrentMediaTime()
            self.elapsedTime = end - start

            for (field, value) in response!.allHeaderFields {
                self.headers["\(field)"] = "\(value)"
            }

            if let segueIdentifier = self.segueIdentifier {
                switch segueIdentifier {
                case "GET", "POST", "PUT", "DELETE":
                    self.body = body
                case "DOWNLOAD":
                    self.body = self.downloadedBodyString()
                default:
                    break
                }
            }

            self.tableView.reloadData()
            self.refreshControl?.endRefreshing()
        }
    }

    private func downloadedBodyString() -> String {
        let fileManager = NSFileManager.defaultManager()
        let cachesDirectory = fileManager.URLsForDirectory(.CachesDirectory, inDomains: .UserDomainMask)[0] as! NSURL

        if let
            contents = fileManager.contentsOfDirectoryAtURL(
                cachesDirectory,
                includingPropertiesForKeys: nil,
                options: .SkipsHiddenFiles,
                error: nil
            ),
            fileURL = contents.first as? NSURL,
            data = NSData(contentsOfURL: fileURL),
            json: AnyObject = NSJSONSerialization.JSONObjectWithData(data, options: nil, error: nil),
            prettyData = NSJSONSerialization.dataWithJSONObject(json, options: .PrettyPrinted, error: nil),
            prettyString = NSString(data: prettyData, encoding: NSUTF8StringEncoding) as? String
        {
            fileManager.removeItemAtURL(fileURL, error: nil)
            return prettyString
        }

        return ""
    }
}

// MARK: - UITableViewDataSource

extension DetailViewController: UITableViewDataSource {
    override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        switch Sections(rawValue: section)! {
        case .Headers:
            return self.headers.count
        case .Body:
            return self.body == nil ? 0 : 1
        default:
            return 0
        }
    }

    override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
        switch Sections(rawValue: indexPath.section)! {
        case .Headers:
            let cell = self.tableView.dequeueReusableCellWithIdentifier("Header") as! UITableViewCell
            let field = self.headers.keys.array.sorted(<)[indexPath.row]
            let value = self.headers[field]

            cell.textLabel?.text = field
            cell.detailTextLabel?.text = value

            return cell
        case .Body:
            let cell = self.tableView.dequeueReusableCellWithIdentifier("Body") as! UITableViewCell

            cell.textLabel?.text = self.body

            return cell
        }
    }
}

// MARK: - UITableViewDelegate

extension DetailViewController: UITableViewDelegate {
    override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
        return 2
    }

    override func tableView(tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
        if self.tableView(tableView, numberOfRowsInSection: section) == 0 {
            return ""
        }

        switch Sections(rawValue: section)! {
        case .Headers:
            return "Headers"
        case .Body:
            return "Body"
        }
    }

    override func tableView(tableView: UITableView, heightForRowAtIndexPath indexPath: NSIndexPath) -> CGFloat {
        switch Sections(rawValue: indexPath.section)! {
        case .Body:
            return 300
        default:
            return tableView.rowHeight
        }
    }

    override func tableView(tableView: UITableView, titleForFooterInSection section: Int) -> String? {
        if Sections(rawValue: section) == .Body, let elapsedTime = self.elapsedTime {
            let elapsedTimeText = DetailViewController.numberFormatter.stringFromNumber(elapsedTime) ?? "???"
            return "Elapsed Time: \(elapsedTimeText) sec"
        }

        return ""
    }
}