//
//  GroupPageViewModel.swift
//  PaiAi
//
//  Created by zhengjianfei on 2017/1/4.
//  Copyright © 2017年 FFIB. All rights reserved.
//

import Foundation
import UIKit
import RxSwift
import RxCocoa
import RxDataSources

public protocol GroupPageViewModelDelegate: class {
    func didSelect(_ item: PhotoItem)
    func navigateToGroupDetail()
    func navigateToGroupQR()
}

public class GroupPageViewModel {
    private let respository: GroupPhotoRepository
    private let items: BehaviorRelay<[PhotoItem]>
    
    weak var delegate: GroupPageViewModelDelegate?
    
    init(groupId: String) {
        respository = GroupPhotoRepository(groupId: groupId)
        items = BehaviorRelay<[PhotoItem]>(value: [])
    }
    
    public var groupPhotoContents: Observable<[AnimatableSectionModel<Int, PhotoItem>]> {
        return items.map({ model in
            return [AnimatableSectionModel(model: 0, items: model)]
        })
    }

    public func submit(image: UIImage) {
        let edge = image.size.width > image.size.height ? image.size.height : image.size.width
//        let newImage = image.scaledImage(1280 / edge),
        guard let data = image.jpegData(compressionQuality: 0.4) else { return }

        respository.upload(data: data)
    }
    
    public func reload() {
        respository.load(page: 1)
    }
    
    public func layoutSizeForIndexPath(_ indexPath: IndexPath) -> CGSize {
        let item = items.value[indexPath.row]
        let w = item.photo_thumbnail_w
        let h = item.photo_thumbnail_h
        return CGSize(width: w, height: h)
    }
}

extension GroupPageViewModel {
    public func didSelect(_ item: PhotoItem) {
        delegate?.didSelect(item)
    }
    
    public func navigateToGroupDetail() {
        delegate?.navigateToGroupDetail()
    }
    
    public func navigateToGroupQR() {
        delegate?.navigateToGroupDetail()
    }
}