//
//  RSDateParserTests.swift
//  
//
//  Created by Maurice Parker on 4/1/21.
//

import Foundation
import XCTest
@testable import Parser

final class DateParserTests: XCTestCase {

	func testDateWithString() {
		var expectedDateResult = dateWithValues(2010, 5, 28, 21, 3, 38)
		
		var d = date("Fri, 28 May 2010 21:03:38 +0000")
		XCTAssertEqual(d, expectedDateResult)

		d = date("Fri, 28 May 2010 21:03:38 +00:00")
		XCTAssertEqual(d, expectedDateResult)

		d = date("Fri, 28 May 2010 21:03:38 -00:00")
		XCTAssertEqual(d, expectedDateResult)

		d = date("Fri, 28 May 2010 21:03:38 -0000")
		XCTAssertEqual(d, expectedDateResult)

		d = date("Fri, 28 May 2010 21:03:38 GMT")
		XCTAssertEqual(d, expectedDateResult)

		d = date("2010-05-28T21:03:38+00:00")
		XCTAssertEqual(d, expectedDateResult)

		d = date("2010-05-28T21:03:38+0000")
		XCTAssertEqual(d, expectedDateResult)

		d = date("2010-05-28T21:03:38-0000")
		XCTAssertEqual(d, expectedDateResult)

		d = date("2010-05-28T21:03:38-00:00")
		XCTAssertEqual(d, expectedDateResult)

		d = date("2010-05-28T21:03:38Z")
		XCTAssertEqual(d, expectedDateResult)

		expectedDateResult = dateWithValues(2010, 7, 13, 17, 6, 40)
		d = date("2010-07-13T17:06:40+00:00")
		XCTAssertEqual(d, expectedDateResult)

		expectedDateResult = dateWithValues(2010, 4, 30, 12, 0, 0)
		d = date("30 Apr 2010 5:00 PDT")
		XCTAssertEqual(d, expectedDateResult)

		expectedDateResult = dateWithValues(2010, 5, 21, 21, 22, 53)
		d = date("21 May 2010 21:22:53 GMT")
		XCTAssertEqual(d, expectedDateResult)

		expectedDateResult = dateWithValues(2010, 6, 9, 5, 0, 0)
		d = date("Wed, 09 Jun 2010 00:00 EST")
		XCTAssertEqual(d, expectedDateResult)

		expectedDateResult = dateWithValues(2010, 6, 23, 3, 43, 50)
		d = date("Wed, 23 Jun 2010 03:43:50 Z")
		XCTAssertEqual(d, expectedDateResult)

		expectedDateResult = dateWithValues(2010, 6, 22, 3, 57, 49)
		d = date("2010-06-22T03:57:49+00:00")
		XCTAssertEqual(d, expectedDateResult)

		expectedDateResult = dateWithValues(2010, 11, 17, 13, 40, 07)
		d = date("2010-11-17T08:40:07-05:00")
		XCTAssertEqual(d, expectedDateResult)
	}

	func testAtomDateWithMissingTCharacter() {
		let expectedDateResult = dateWithValues(2010, 11, 17, 13, 40, 07)
		let d = date("2010-11-17 08:40:07-05:00")
		XCTAssertEqual(d, expectedDateResult)
	}
	
	func testFeedbinDate() {
		let expectedDateResult = dateWithValues(2019, 9, 27, 21, 01, 48)
		let d = date("2019-09-27T21:01:48.000000Z")
		XCTAssertEqual(d, expectedDateResult)
	}

	func testMillisecondDate() {
		let expectedDateResult = dateWithValues(2021, 03, 29, 10, 46, 56, 516)
		let d = date("2021-03-29T10:46:56.516+00:00")
		XCTAssertEqual(d, expectedDateResult)
	}

	func testExtraMillisecondPrecisionDate() {
		let expectedDateResult = dateWithValues(2021, 03, 29, 10, 46, 56, 516)
		let d = date("2021-03-29T10:46:56.516941+00:00")
		XCTAssertEqual(d, expectedDateResult)
	}

	func testW3CParsingPerformance() {

		// 0.0001 seconds on my Mac Studio M1
		self.measure {
			_ = date("2021-03-29T10:46:56.516941+00:00")
		}
	}

	func testPubDateParsingPerformance() {
		
		// 0.0001 seconds on my Mac Studio M1
		self.measure {
			_ = date("21 May 2010 21:22:53 GMT")
		}
	}
}

private extension DateParserTests {

	func date(_ string: String) -> Date? {
		let d = Data(string.utf8)
		return DateParser.date(data: d)
	}
}

func dateWithValues(_ year: Int, _ month: Int, _ day: Int, _ hour: Int, _ minute: Int, _ second: Int, _ millisecond: Int = 0) -> Date {
	var dateComponents = DateComponents()
	dateComponents.calendar = Calendar.current
	dateComponents.timeZone = TimeZone(secondsFromGMT: 0)

	dateComponents.year = year
	dateComponents.month = month
	dateComponents.day = day
	dateComponents.hour = hour
	dateComponents.minute = minute
	dateComponents.second = second
	dateComponents.nanosecond = millisecond * 1000000

	return dateComponents.date!
}