//

// Value+JSON.swift

// ShapeScript Lib

//

// Created by Nick Lockwood on 08/10/2022.

// Copyright © 2022 Nick Lockwood. All rights reserved.

//

import Foundation

extension Value {

init(jsonData: Data) throws {

do {

let json = try JSONSerialization.jsonObject(with: jsonData)

self.init(json: json)

} catch {

let nsError = error as NSError

var message = nsError.userInfo["NSDebugDescription"] as? String ?? nsError.localizedDescription

var index: String.Index?

if let byteOffset = nsError.userInfo["NSJSONSerializationErrorIndex"] as? Int {

index = String(data: jsonData[0 ..< byteOffset], encoding: .utf8)?.endIndex

}

if index != nil, let range = message.range(of: " around line ") {

message = String(message[..<range.lowerBound])

}

throw ParserError(.custom(message, hint: nil, at: index.map { $0 ..< $0 }))

}

}

init(json: Any) {

switch json {

case let array as [Any]:

self = .tuple(array.map(Value.init(json:)))

case let object as [String: Any]:

self = .object(object.mapValues(Value.init(json:)))

case let string as String:

self = .string(string)

case let number as NSNumber:

if number.objCType.pointee == 99 { // boolean

self = .boolean(number.boolValue)

} else {

self = .number(number.doubleValue)

}

case is NSNull:

self = .void

case let value:

assertionFailure("Unsupported JSON value \(value)")

self = .void

}

}

}