//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift.org open source project
//
// Copyright (c) 2014 - 2016 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//

@_exported import os
@_exported import os.log

@available(OSX 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
public func os_log(
	_ message: StaticString, 
	dso: UnsafeRawPointer? = #dsohandle,
	log: OSLog = .default, 
	type: OSLogType = .default, 
	_ args: CVarArg...) 
{
	guard log.isEnabled(type: type) else { return }

	message.withUTF8Buffer { (buf: UnsafeBufferPointer<UInt8>) in
		// Since dladdr is in libc, it is safe to unsafeBitCast
                // the cstring argument type.
		let str = unsafeBitCast(buf.baseAddress!, to: UnsafePointer<Int8>.self)
		withVaList(args) { valist in
		  _swift_os_log(dso, log, type, str, valist)
    }
	}
}

extension OSLogType {
	@available(OSX 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
	public static let `default` = __OS_LOG_TYPE_DEFAULT

	@available(OSX 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
	public static let info = __OS_LOG_TYPE_INFO

	@available(OSX 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
	public static let debug = __OS_LOG_TYPE_DEBUG

	@available(OSX 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
	public static let error = __OS_LOG_TYPE_ERROR

	@available(OSX 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
	public static let fault = __OS_LOG_TYPE_FAULT
}

extension OSLog {
	@available(OSX 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
	public static let `default` = _swift_os_log_default()

	@available(OSX 10.12, iOS 10.0, watchOS 3.0, tvOS 10.0, *)
	public convenience init(subsystem: String, category: String) {
		self.init(__subsystem: subsystem, category: category)
	}
}

@_silgen_name("_swift_os_log")
internal func _swift_os_log(_ dso: UnsafeRawPointer!, _ log: OSLog, _ type: OSLogType, _ format: UnsafePointer<Int8>!, _ args: CVaListPointer)

@_silgen_name("_swift_os_log_default")
internal func _swift_os_log_default() -> OSLog

@available(*, unavailable, renamed: "OSLogType.default")
public var OS_LOG_TYPE_DEFAULT: OSLogType {
	fatalError()
}

@available(*, unavailable, renamed: "OSLogType.info")
public var OS_LOG_TYPE_INFO: OSLogType {
	fatalError()
}

@available(*, unavailable, renamed: "OSLogType.debug")
public var OS_LOG_TYPE_DEBUG: OSLogType {
	fatalError()
}

@available(*, unavailable, renamed: "OSLogType.error")
public var OS_LOG_TYPE_ERROR: OSLogType {
	fatalError()
}

@available(*, unavailable, renamed: "OSLogType.fault")
public var OS_LOG_TYPE_FAULT: OSLogType {
	fatalError()
}