//
//  MessageViewController.swift
//  PaiAi
//
//  Created by mac on 16/5/13.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import UIKit
import RxSwift
import RxCocoa
import RxDataSources

protocol MessageViewControllerDelegate: class {
    func didSelect(item: MessageItem)
}

final class MessageViewController: UIViewController {

    // MARK: Storyboard property
    @IBOutlet var tableView: UITableView!
    var emptyView : UILabel = {
        let empty = UILabel(frame: CGRect(x: kScreenWidth / 2 - 50, y: 74, width: 50, height: 50))
        
        empty.isHidden = true
        empty.text = "当前没有任何消息"
        empty.textColor = UIColor.gray
        empty.font = UIFont.systemFont(ofSize: 14)
        
        empty.sizeToFit()
        return empty
    }()

    // MARK: data property
    var messageViewModel: MessageViewModel? = nil
    let disposeBag = DisposeBag()
    
    weak var delegate: MessageViewControllerDelegate?

  // MARK: parameter property
    var type = MessageType.zan {
        willSet {
            messageViewModel = MessageViewModel(type: newValue)
        }
    }

    // MARK: view function
    override func viewDidLoad() {
        super.viewDidLoad()

        configureRxDataSource()
        messageViewModel?.reload(isRefresh: true)
        view.addSubview(emptyView)
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(true)
//        titleWithbackBar = messageViewModel?.messageType.model.title ?? ""
        navigationItem.setRightBars(buttonSpace: 0,
                                    images: [UIImage(named: "更多-右上角-1")],
                                    actions: [#selector(clearMessages)],
                                    target: self)
    }

    var dataSource: RxTableViewSectionedAnimatedDataSource<AnimatableSectionModel<Int, MessageItem>> {
        return RxTableViewSectionedAnimatedDataSource<AnimatableSectionModel<Int, MessageItem>>(configureCell: { (dataSource, tableView, indexPath, item) in
            switch self.type {
            case .system:
                let cell = tableView.dequeueReusableCell(withIdentifier: "messageCell", for: indexPath) as! MessageCell
                cell.setInfo(item)
                return cell
            case .comment, .zan:
                let cell = tableView.dequeueReusableCell(withIdentifier: "commentCell", for: indexPath) as! CommentCell
                cell.setInfo(item, type: self.type)
                return cell
            }
        }, canEditRowAtIndexPath: { _, _ in true })
    }
    
    func configureRxDataSource() {
        
        messageViewModel?.hasData
            .bind(to: emptyView.rx.isHidden)
            .disposed(by: disposeBag)
        
        messageViewModel?.messageContents
            .bind(to: tableView.rx.items(dataSource: dataSource))
            .disposed(by: disposeBag)
        
        tableView.rx.modelDeleted(MessageItem.self)
            .subscribe(onNext: { [unowned self] in self.messageViewModel?.remove($0)})
            .disposed(by: disposeBag)
        
        tableView.rx.modelSelected(MessageItem.self)
            .subscribe(onNext: { [unowned self] in self.delegate?.didSelect(item: $0) })
            .disposed(by: disposeBag)
        
        tableView.rx.willDisplayCell
            .subscribe({ [unowned self] in self.messageViewModel?.preload(indexPath: $0.element?.indexPath)})
            .disposed(by: disposeBag)
    }
    
// MARK: button function
    @objc func clearMessages() {
        let alert = FFAlertController(title: "", message: "", alertStyle: .actionSheet)
        alert.addAlertAction(alertAction: DestructiveAlertAction(title: "清空消息", handler: { (alertAction) in
            self.messageViewModel?.removeAll()
        }))
        alert.addAlertAction(alertAction: FFAlertAction(title: "取消", handler: nil))

        presentController(alert)
    }
}