/*
 Copyright 2019 New Vector Ltd
 
 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at
 
 http://www.apache.org/licenses/LICENSE-2.0
 
 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */

import Foundation

struct EmojiJSONStore {
    let categories: [EmojiJSONCategory]
    let emojis: [EmojiItem]
}

// MARK: - Decodable
extension EmojiJSONStore: Decodable {
    
    enum CodingKeys: String, CodingKey {
        case categories
        case emojis
    }
    
    struct EmojiKey: CodingKey {
        var stringValue: String
        
        init?(stringValue: String) {
            self.stringValue = stringValue
        }
        
        var intValue: Int? { return nil }
        init?(intValue: Int) { return nil }
    }
    
    public init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)
        
        let emojisContainer = try container.nestedContainer(keyedBy: EmojiKey.self, forKey: .emojis)
        
        let emojis: [EmojiItem] = emojisContainer.allKeys.compactMap { (emojiKey) -> EmojiItem? in
            let emojiItem: EmojiItem?
            
            do {
                emojiItem = try emojisContainer.decode(EmojiItem.self, forKey: emojiKey)
            } catch {
                print(error)
                emojiItem = nil
            }
            
            return emojiItem
        }
        
        let categories = try container.decode([EmojiJSONCategory].self, forKey: .categories)
        
        self.init(categories: categories, emojis: emojis)
    }
}