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

import Foundation

public class Instance: Decodable {
    public let uri: String
    public let title: String
    public let description: String
    public let email: String?
    public let version: String
    public let urls: [String: URL]
    public let thumbnail: URL?
    public let languages: [String]?
    public let stats: Stats?

    // pleroma doesn't currently implement these
    public let contactAccount: Account?
    
    // MARK: Unofficial additions to the Mastodon API.
    public let maxStatusCharacters: Int?
    
    // we need a custom decoder, because all API-compatible implementations don't return some data in the same format
    public required init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        self.uri = try container.decode(String.self, forKey: .uri)
        self.title = try container.decode(String.self, forKey: .title)
        self.description = try container.decode(String.self, forKey: .description)
        self.email = try container.decodeIfPresent(String.self, forKey: .email)
        self.version = try container.decode(String.self, forKey: .version)
        if let urls = try? container.decodeIfPresent([String: URL].self, forKey: .urls) {
            self.urls = urls
        } else {
            self.urls = [:]
        }
        
        self.languages = try? container.decodeIfPresent([String].self, forKey: .languages)
        self.contactAccount = try? container.decodeIfPresent(Account.self, forKey: .contactAccount)
        
        self.stats = try? container.decodeIfPresent(Stats.self, forKey: .stats)
        self.thumbnail = try? container.decodeIfPresent(URL.self, forKey: .thumbnail)
        if let maxStatusCharacters = try? container.decodeIfPresent(Int.self, forKey: .maxStatusCharacters) {
            self.maxStatusCharacters = maxStatusCharacters
        } else if let str = try? container.decodeIfPresent(String.self, forKey: .maxStatusCharacters),
            let maxStatusCharacters = Int(str, radix: 10) {
            self.maxStatusCharacters = maxStatusCharacters
        } else {
            self.maxStatusCharacters = nil
        }
        
    }
    
    private enum CodingKeys: String, CodingKey {
        case uri
        case title
        case description
        case email
        case version
        case urls
        case thumbnail
        case languages
        case stats
        
        case contactAccount = "contact_account"
        
        case maxStatusCharacters = "max_toot_chars"
    }
}

extension Instance {
    public class Stats: Decodable {
        public let domainCount: Int?
        public let statusCount: Int?
        public let userCount: Int?
        
        private enum CodingKeys: String, CodingKey {
            case domainCount = "domain_count"
            case statusCount = "status_count"
            case userCount = "user_count"
        }
    }
}