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

import Foundation

public struct Filter: FilterProtocol, Decodable {
    public let id: String
    public let phrase: String
    private let context: [String]
    public let expiresAt: Date?
    public let irreversible: Bool
    public let wholeWord: Bool
    
    public var contexts: [Context] {
        get {
            return context.compactMap(Context.init)
        }
    }
    
    public static func update(_ filter: some FilterProtocol, phrase: String? = nil, context: [Context]? = nil, irreversible: Bool? = nil, wholeWord: Bool? = nil, expiresIn: TimeInterval? = nil) -> Request<Filter> {
        return Request<Filter>(method: .put, path: "/api/v1/filters/\(filter.id)", body: ParametersBody([
            "phrase" => (phrase ?? filter.phrase),
            "irreversible" => (irreversible ?? filter.irreversible),
            "whole_word" => (wholeWord ?? filter.wholeWord),
            "expires_in" => (expiresIn ?? filter.expiresAt?.timeIntervalSinceNow),
        ] + "context" => (context ?? filter.contexts).contextStrings))
    }
    
    public static func delete(_ filterID: String) -> Request<Empty> {
        return Request<Empty>(method: .delete, path: "/api/v1/filters/\(filterID)")
    }
    
    private enum CodingKeys: String, CodingKey {
        case id
        case phrase
        case context
        case expiresAt = "expires_at"
        case irreversible
        case wholeWord = "whole_word"
    }
}

extension Filter {
    public enum Context: String, Decodable, CaseIterable {
        case home
        case notifications
        case `public`
        case thread
        case account
    }
}

extension Array where Element == Filter.Context {
    var contextStrings: [String] {
        return map { $0.rawValue }
    }
}