//
//  PickerViewAdapter.swift
//  Lookfit
//
//  Created by lemo. on 2020/6/7.
//  Copyright © 2020 Sheldon. All rights reserved.
//

import Foundation

class DoublePickerViewViewAdapter
    : NSObject
    , UIPickerViewDataSource
    , UIPickerViewDelegate
    , RxPickerViewDataSourceType
, SectionedViewDataSourceType {

    typealias Element = [[String]]
    private var items: [[String]] = []

    func model(at indexPath: IndexPath) throws -> Any {
        return items[indexPath.section][indexPath.row]
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return items.count
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return items[component].count
    }

    func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
        return kScaleHeight(48)
    }

    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
        let label = UILabel()
        label.text = items[component][row]
        label.font = SystemMediumFont(27)
        label.textAlignment = .center
        return label
    }

    func pickerView(_ pickerView: UIPickerView, observedEvent: Event<[[String]]>) {
        Binder(self) { (adapter, items) in
            adapter.items = items
            pickerView.reloadAllComponents()
            }.on(observedEvent)
    }
}

class SinglePickerViewViewAdapter
    : NSObject
    , UIPickerViewDataSource
    , UIPickerViewDelegate
    , RxPickerViewDataSourceType
, SectionedViewDataSourceType {

    typealias Element = [String]
    private var items: [String] = []

    func model(at indexPath: IndexPath) throws -> Any {
        return items[indexPath.row]
    }

    func numberOfComponents(in pickerView: UIPickerView) -> Int {
        return 1
    }

    func pickerView(_ pickerView: UIPickerView, numberOfRowsInComponent component: Int) -> Int {
        return items.count
    }

    func pickerView(_ pickerView: UIPickerView, rowHeightForComponent component: Int) -> CGFloat {
        return kScaleHeight(48)
    }

    func pickerView(_ pickerView: UIPickerView, viewForRow row: Int, forComponent component: Int, reusing view: UIView?) -> UIView {
        let label = UILabel()
        label.text = items[row]
        label.textAlignment = .center
        label.font = SystemMediumFont(27)
        label.textAlignment = .center
        return label
    }

    func pickerView(_ pickerView: UIPickerView, observedEvent: Event<[String]>) {
        Binder(self) { (adapter, items) in
            adapter.items = items
            pickerView.reloadAllComponents()
            }.on(observedEvent)
    }
}