//

// ProjectFile.swift

// XcodeProject

//

// Created by Geoffrey Foster on 2016-11-16.

// Copyright © 2017 Geoffrey Foster. All rights reserved.

//

import Foundation

public enum ObjectVersion: UInt, Comparable, CaseIterable {

public static func < (lhs: ObjectVersion, rhs: ObjectVersion) -> Bool {

return lhs.rawValue < rhs.rawValue

}

case xcode31 = 45

case xcode32 = 46

case xcode63 = 47

case xcode8 = 48

case xcode93 = 50

case xcode10 = 51

}

public final class ProjectFile {

enum Error: Swift.Error {

case invalid

case invalidPlist

case missingProject

}

struct RootKey {

static let classes = "classes"

static let objects = "objects"

static let objectVersion = "objectVersion"

static let archiveVersion = "archiveVersion"

static let rootObject = "rootObject"

}

var archiveVersion: UInt = 1

var objectVersion: ObjectVersion = .xcode8

var classes: [AnyHashable: Any] = [:]

var rootObject: PBXGlobalID

/// The root project structure

public private(set) var project: PBXProject

let url: URL

/// Initializes a new project file from the given URL

///

/// - Parameter url: Path to an xcodeproj file to be opened

/// - Returns: A fully parsed project from the provided source or `nil` if an error happened

public init(url: URL) throws {

self.url = url

let pbxproj = URL(fileURLWithPath: "project.pbxproj", relativeTo: url)

let data = try Data(contentsOf: pbxproj)

guard let plist = try PropertyListSerialization.propertyList(from: data, options: [], format: nil) as? [String: Any] else {

throw Error.invalidPlist

}

guard

let archiveVersionString = plist[RootKey.archiveVersion] as? String, let archiveVersion = UInt(archiveVersionString),

let objectVersionString = plist[RootKey.objectVersion] as? String, let objectVersionInt = UInt(objectVersionString), let objectVersion = ObjectVersion(rawValue: objectVersionInt),

let rootObject = PBXGlobalID(rawValue: plist[RootKey.rootObject] as? String),

let classes = plist[RootKey.classes] as? [AnyHashable: Any], classes.isEmpty

else {

throw Error.invalidPlist

}

self.archiveVersion = archiveVersion

self.objectVersion = objectVersion

self.rootObject = rootObject

self.classes = classes

guard let objects = plist[RootKey.objects] as? [String: Any] else {

throw Error.invalidPlist

}

let objectCache = ObjectCache(plist: objects, types: types)

guard let project = objectCache.object(for: rootObject) as? PBXProject else {

throw Error.missingProject

}

project.path = url.path

self.project = project

}

}

extension ProjectFile {

/// Saves the project file to disk with any modifications.

///

/// - Parameter to: Optional destination where the project file will be saved.

/// - Throws:

public func save(to destination: URL? = nil) throws {

let destination = destination ?? url

let dataStream = DataStreamWriter()

let archiver = PBXPListArchiver(projectFile: self)

try archiver.write(stream: dataStream)

let pbxprojURL = URL(fileURLWithPath: "project.pbxproj", relativeTo: destination)

try dataStream.data.write(to: pbxprojURL, options: [.atomic])

}

}