//
//  Hashtag.swift
//  Pachyderm
//
//  Created by Shadowfacts on 9/9/18.
//  Copyright © 2018 Shadowfacts. All rights reserved.
//

import Foundation

public class Hashtag: Codable {
    public let name: String
    public let url: URL
    public let history: [History]?
    
    public init(name: String, url: URL) {
        self.name = name
        self.url = url
        self.history = nil
    }
    
    private enum CodingKeys: String, CodingKey {
        case name
        case url
        case history
    }
}

extension Hashtag {
    public class History: Codable {
        public let day: Date
        public let uses: Int
        public let accounts: Int
        
        public required init(from decoder: Decoder) throws {
            let container = try decoder.container(keyedBy: CodingKeys.self)
            
            if let day = try? container.decode(Date.self, forKey: .day) {
                self.day = day
            } else if let unixTimestamp = try? container.decode(Double.self, forKey: .day) {
                self.day = Date(timeIntervalSince1970: unixTimestamp)
            } else if let str = try? container.decode(String.self, forKey: .day),
                let unixTimestamp = Double(str) {
                self.day = Date(timeIntervalSince1970: unixTimestamp)
            } else {
                throw DecodingError.dataCorruptedError(forKey: .day, in: container, debugDescription: "day must be either date or UNIX timestamp")
            }
            
            if let uses = try? container.decode(Int.self, forKey: .uses) {
                self.uses = uses
            } else if let str = try? container.decode(String.self, forKey: .uses),
                let uses = Int(str) {
                self.uses = uses
            } else {
                throw DecodingError.dataCorruptedError(forKey: .uses, in: container, debugDescription: "uses must either be int or string containing int")
            }
            
            if let accounts = try? container.decode(Int.self, forKey: .accounts) {
                self.accounts = accounts
            } else if let str = try? container.decode(String.self, forKey: .accounts),
                let accounts = Int(str) {
                self.accounts = accounts
            } else {
                throw DecodingError.dataCorruptedError(forKey: .accounts, in: container, debugDescription: "accounts must either be int or string containing int")
            }
        }

        private enum CodingKeys: String, CodingKey {
            case day
            case uses
            case accounts
        }
    }
}

extension Hashtag: Equatable, Hashable {
    public static func ==(lhs: Hashtag, rhs: Hashtag) -> Bool {
        return lhs.name == rhs.name
    }
    
    public func hash(into hasher: inout Hasher) {
        hasher.combine(url)
    }
}