//
//  HomePhotoModel.swift
//  PaiAi
//
//  Created by FFIB on 16/3/31.
//  Copyright © 2016年 FFIB. All rights reserved.
//

import Foundation
import RxCocoa
import RxSwift

struct NoMoreDataError: Error {}

final class HomePhotoRepository: Resource {
    fileprivate(set) var items: BehaviorRelay<[PhotoItem]>
    fileprivate var hasMore: Bool
    fileprivate var page: Int
    fileprivate var loadingSchedule: PublishSubject<Bool>
    
    var path: Interfaces {
        return .home
    }
    
    #warning("user_id 填充")
    var parameter: Parameter = ["user_id": ""]
    
    init() {
        page = 1
        hasMore = true
        loadingSchedule = PublishSubject<Bool>()
        items = BehaviorRelay<[PhotoItem]>(value: [])
    }
}

extension HomePhotoRepository: Parsable {
    typealias Item = [PhotoItem]
    
    func parse(_ json: JSON) -> [PhotoItem]? {
        guard let data = json["data"] as? [String: AnyObject],
            let left = data["left"] as? Int,
            let photos = data["photos"] as? [[String: AnyObject]] else {
                return nil
        }
        hasMore = left > 0
        return photos.map { return PhotoItem(json: $0) }
    }
}

extension HomePhotoRepository: Gettable {
    func loadContent(isRefresh: Bool) {
        guard hasMore else {
            loadingSchedule.onNext(isRefresh)
            return
        }
        
        self.page = isRefresh ? 1 : self.page + 1
        self.parameter["page"] = self.page
        let request = NetworkApi.share.post(resource: self) { result in
            
            defer { self.loadingSchedule.onNext(isRefresh) }
            
            guard case let .success(photoItems) = result else {
                return
            }
            
            if isRefresh {
                self.items.accept(photoItems)
            } else {
                self.items.accept(self.items.value + photoItems)
            }
        }
    }
}