// swiftlint:disable all
//
//  ASN1Object.swift
//
//  Copyright © 2017 Filippo Maguolo.
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the "Software"), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in all
//  copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
//  SOFTWARE.

import Foundation

public class ASN1Object: CustomStringConvertible {
    
    /// This property contains the DER encoded object
    public var rawValue: Data?

    /// This property contains the decoded Swift object whenever is possible
    public var value: Any?

    public var identifier: ASN1Identifier?

    var sub: [ASN1Object]?

    public internal(set) weak var parent: ASN1Object?

    public func sub(_ index: Int) -> ASN1Object? {
        if let sub = self.sub, index >= 0, index < sub.count {
            return sub[index]
        }
        return nil
    }

    public func subCount() -> Int {
        return sub?.count ?? 0
    }

    public func findOid(_ oid: OID) -> ASN1Object? {
        return findOid(oid.rawValue)
    }
    
    public func findOid(_ oid: String) -> ASN1Object? {
        for child in sub ?? [] {
            if child.identifier?.tagNumber() == .objectIdentifier {
                if child.value as? String == oid {
                    return child
                }
            } else {
                if let result = child.findOid(oid) {
                    return result
                }
            }
        }
        return nil
    }

    public var description: String {
        return printAsn1()
    }

    public var asString: String? {
        if let string = value as? String {
            return string
        }
        
        for item in sub ?? [] {
            if let string = item.asString {
                return string
            }
        }
        
        return nil
    }
    
    fileprivate func printAsn1(insets: String = "") -> String {
        var output = insets
        output.append(identifier?.description.uppercased() ?? "")
        output.append(value != nil ? ": \(value!)": "")
        if identifier?.typeClass() == .universal, identifier?.tagNumber() == .objectIdentifier {
            if let oidName = OID.description(of: value as? String ?? "") {
                output.append(" (\(oidName))")
            }
        }
        output.append(sub != nil && sub!.count > 0 ? " {": "")
        output.append("\n")
        for item in sub ?? [] {
            output.append(item.printAsn1(insets: insets + "    "))
        }
        output.append(sub != nil && sub!.count > 0 ? insets + "}\n": "")
        return output
    }
}
// swiftlint:enable all