//
//  NotificationCellAdapter.swift
//  PrivadoVPN
//
//  Created by Zhandos Bolatbekov on 21.01.2021.
//  Copyright © 2021 Privado LLC. All rights reserved.
//

import Foundation
import SwiftyMarkdown
import UIKit

enum NotificationCellType {
    case ipad
    case iphone
}

typealias NotificationCellLinkAction = (URL) -> Void

struct NotificationCellAdapter {
    
    private enum Constants {
        static let dateFormat = "dd/MM/yyyy"
        enum IPhone {
            static let bodyColor = UIColor(rgb: 0x7a86be)
            static let bodyFontName = "SFProText-Regular"
            static let bodyFontSize: CGFloat = 16.7
        }
        enum IPad {
            static let titleLineSpacing: CGFloat = 8
            static let bodyColor = Colors.Notification.accent.color
            static let bodyFontName = "Spartan-Regular"
            static let bodyFontSize: CGFloat = 10
        }
    }
    
    let type: NotificationCellType
    let title: String?
    var attrTitle: NSAttributedString?
    let body: NSAttributedString?
    let date: String?
    let linkAction: NotificationCellLinkAction?
    
    init(with type: NotificationCellType, notification: PrivadoNotification, linkAction: NotificationCellLinkAction?) {
        self.type = type
        self.title = notification.payload.subject
        self.body = Self.getFormattedMarkdown(from: notification.payload.body, cellType: type)
        self.date = Self.getFormattedDate(from: notification.payload.sentDate)
        self.linkAction = linkAction
        
        guard let str = notification.payload.subject else { return }
        let style = NSMutableParagraphStyle()
        style.lineSpacing = Constants.IPad.titleLineSpacing
        self.attrTitle = NSAttributedString(string: str, attributes: [.paragraphStyle: style])
    }
    
    private static func getFormattedMarkdown(from body: String, cellType: NotificationCellType) -> NSAttributedString {
        let md = SwiftyMarkdown(string: body)
        switch cellType {
        case .ipad:
            md.body.color = Constants.IPad.bodyColor
            md.body.fontName = Constants.IPad.bodyFontName
            md.body.fontSize = Constants.IPad.bodyFontSize
            md.link.color = UIColor.white
            md.link.fontName = Constants.IPad.bodyFontName
            md.link.fontSize = Constants.IPad.bodyFontSize
            md.underlineLinks = true
        case .iphone:
            md.body.color = Constants.IPhone.bodyColor
            md.body.fontName = Constants.IPhone.bodyFontName
            md.body.fontSize = Constants.IPhone.bodyFontSize
        }
        return md.attributedString()
    }
    
    private static func getFormattedDate(from dateString: String) -> String? {
        guard let standardDate = DateFormatter.iso8601Full.date(from: dateString) else { return nil }
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = Constants.dateFormat
        return dateFormatter.string(from: standardDate)
    }
}