//
//  HomeViewModel.swift
//  PaiAi
//
//  Created by zhengjianfei on 2016/12/29.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import Foundation
import RxSwift
import RxCocoa
import RxDataSources


public protocol HomeViewModelDelegate: class {
    func scanQR()
    func createGroup()
    func didSelect(_ item: PhotoItem)
}

public typealias HomeSource = HomePhotoRepositorable & Gettable & Layoutable

public struct HomeViewModel<T: HomeSource> {
    private let respository: T
    
    public var isReload: Observable<Bool>
    public var isloading: Observable<Bool>
    public weak var delegate: HomeViewModelDelegate?
    
    public init(respository: T) {
        self.respository = respository
        isReload = respository.loadingObserver.filter { $0 }
        isloading = respository.loadingObserver.filter { !$0 }
    }

    public var homePhotoContents: Observable<[AnimatableSectionModel<Int, T.Content.Element>]> {
        return respository.content.map({ model in
            return [AnimatableSectionModel(model: 0, items: model)]
        })
    }
    
    public func reload() {
        respository.loadContent(isRefresh: true)
    }
    
    public func preload() {
        respository.loadContent(isRefresh: false)
    }
    
    public func layoutSizeForIndexPath(_ indexPath: IndexPath) -> CGSize {
        let i = indexPath.row
        return respository.layoutSizeForIndex(i)
    }
    
    public func scanQR() {
        delegate?.scanQR()
    }
    
    public func createGroup() {
        delegate?.createGroup()
    }
    
    func didSelect(_ item: T.Content.Element) {
        delegate?.didSelect(item)
    }
}