//
//  MineOrderViewController.swift
//  Paiai_iOS
//
//  Created by FFIB on 16/4/7.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import UIKit
import RxSwift
import RxCocoa
import RxDataSources
import PaiaiDataKit
import PaiaiUIKit
import PullToRefresh

final class MineOrderViewController: UIViewController {

    @IBOutlet weak var tableView: UITableView!

    fileprivate let disposeBag = DisposeBag()
    var viewModel: MineOrderViewModel!

    override func viewDidLoad() {
        super.viewDidLoad()
        setup()
        binding()
        setNavigationBar()
    }

    private func setNavigationBar() {
        navigationItem.title = "订单记录"
    }

    private func setup() {
        setupReloadControl()
        setupLoadingControl()
    }

    private func setupReloadControl() {
        tableView.addPullToRefresh(PullToRefresh()) {
            [weak self] in
            guard let `self` = self else { return }
            self.viewModel.reload()
        }
        tableView.startRefreshing(at: .top)
    }

    private func setupLoadingControl() {
        tableView.addPullToRefresh(PullToRefresh(position: .bottom)) {
            [weak self] in
            guard let `self` = self else { return }
            self.viewModel.preload()
        }
    }

    deinit {
        tableView.removeAllPullToRefresh()
    }
}

/// binding UI
fileprivate extension MineOrderViewController {

    var dataSource: RxTableViewSectionedReloadDataSource<AnimatableSectionModel<Int, OrderItem>> {
        return RxTableViewSectionedReloadDataSource<AnimatableSectionModel<Int, OrderItem>>(
            configureCell: { (_, tableView, indexPath, item) in
                let cell = tableView.dequeueReusableCell(withIdentifier: "orderCell", for: indexPath) as! OrderCell
                cell.setInfo(item)
                return cell
        })
    }

    func binding() {
        bindViewModelToTableView()
        bindTableViewToViewModel()
        bindViewModelToRefreshing()
    }

    func bindViewModelToTableView() {
        viewModel.contents
            .bind(to: tableView.rx.items(dataSource: dataSource))
            .disposed(by: disposeBag)
    }

    func bindTableViewToViewModel() {
        tableView.rx.modelSelected(OrderItem.self)
            .asDriver()
            .drive(onNext: { [unowned self] in self.viewModel.didSelect($0) })
            .disposed(by: disposeBag)

        tableView.rx.willDisplayCell
            .asDriver()
            .drive(onNext: { [unowned self] in self.preload(indexPath: $0.indexPath) })
            .disposed(by: disposeBag)
    }

    func preload(indexPath: IndexPath) {
        guard indexPath.row == tableView.numberOfRows(inSection: 0) - 5 else { return }
        tableView.startRefreshing(at: .bottom)
    }

    func bindViewModelToRefreshing() {
        viewModel.isLoading
            .asDriver(onErrorJustReturn: true)
            .drive(onNext: {[weak self] flag in
                guard let `self` = self else { return }
                if flag {
                    self.tableView.endRefreshing(at: .top)
                } else {
                    self.tableView.endRefreshing(at: .bottom)
                }
            }).disposed(by: disposeBag)
    }
}

extension MineOrderViewController: NavigationBackViewController {}

extension MineOrderViewController: Storyboarded {
    static func instantiate() -> MineOrderViewController {
        return UIStoryboard.mine.instantiateViewController(type: MineOrderViewController.self)
    }
}