@IBOutlet weak var tableView: UITableView!

var posts = [Post]()




override func viewDidLoad() {
    super.viewDidLoad()


    loadPosts()

    tableView.dataSource = self
    tableView.estimatedRowHeight = 375
    tableView.rowHeight = UITableView.automaticDimension


}





func loadPosts() {

    Database.database().reference().child("posts").observe(.childAdded) { (snapshot: DataSnapshot) in

        if let dict = snapshot.value as? [String: Any] {

            let newPost = Post.transformPost(dict: dict)
            self.posts.append(newPost)
            self.tableView.reloadData()

        }

    }

}

func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {

    return posts.count

}


func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {

    let cell = tableView.dequeueReusableCell(withIdentifier: "PostCell", for: indexPath) as! HomeTableViewCell
    let post = posts[indexPath.row]

    cell.post = post

    return cell

}

@IBOutlet weak var profileImageView: UIImageView!
@IBOutlet weak var usernameLabel: UILabel!

@IBOutlet weak var postImageView: UIImageView!
@IBOutlet weak var captionLabel: UILabel!

@IBOutlet weak var cheerButton: UIButton!
@IBOutlet weak var donateButton: UIButton!
@IBOutlet weak var commentButton: UIButton!



var post: Post? {
    didSet {
        updateView()
    }
}






func updateView() {

    captionLabel.text = post?.caption

    if let photoUrlString = post?.photoUrl {

        let photoUrl = URL(string: photoUrlString)
        postImageView.sd_setImage(with: photoUrl)

    }

    setUpUserInfo()

}






func setUpUserInfo() {

    if let uid = post?.uid {

        Database.database().reference().child("users").child(uid).observeSingleEvent(of: DataEventType.value, with: {
            snapshot in

            if let dict = snapshot.value as? [String: Any] {

                let user = User.transformUser(dict: dict)
                self.usernameLabel.text = user.username

                if let photoUrlString = user.profileImageUrl {

                    let photoUrl = URL(string: photoUrlString)
                    self.profileImageView.sd_setImage(with: photoUrl)
                }

            }

        })

    }

}




override func awakeFromNib() {
    super.awakeFromNib()



    usernameLabel.text = ""
    captionLabel.text = ""


}



override func setSelected(_ selected: Bool, animated: Bool) {
    super.setSelected(selected, animated: animated)

}

var caption: String?
var photoUrl: String?
var uid: String?

static func transformPost(dict: [String: Any]) -> Post {

    let post = Post()
    post.caption = dict["caption"] as? String
    post.photoUrl = dict["photoUrl"] as? String
    post.uid = dict["uid"] as? String

    return post

}

var email: String?
var profileImageUrl: String?
var username: String?

static func transformUser(dict: [String: Any]) -> User {

    let user = User()
    user.email = dict["email"] as? String
    user.profileImageUrl = dict["profileImageUrl"] as? String
    user.username = dict["username"] as? String

    return user

}