//
//  OPMLTests.swift
//  Parser
//
//  Created by Brent Simmons on 6/25/17.
//  Copyright © 2017 Ranchero Software, LLC. All rights reserved.
//

import XCTest
@testable import Parser

final class OPMLTests: XCTestCase {

	let subsData = parserData("Subs", "opml", "http://example.org/")

	func testOPMLParsingPerformance() {

		// 0.003 sec on my M1 Mac Studio 2022
		self.measure {
			let _ = OPMLParser.document(with: self.subsData)
		}
	}

	func testNotOPML() {

		let d = parserData("DaringFireball", "rss", "http://daringfireball.net/")
		XCTAssertNil(OPMLParser.document(with: d))
	}

	func testSubsStructure() {
		let opmlDocument = OPMLParser.document(with: subsData)
		XCTAssertNotNil(opmlDocument)

		XCTAssertEqual("Subs", opmlDocument!.title)
		XCTAssertEqual("http://example.org/", opmlDocument!.url)
		recursivelyCheckOPMLStructure(opmlDocument!)
	}


	func testFindingTitles() {
		// https://github.com/brentsimmons/NetNewsWire/issues/527
		// Fix a bug where titles aren’t found when there’s no title attribute in the OPML,
		// which appears to be true with OPML generated by The Old Reader.

		let d = parserData("SubsNoTitleAttributes", "opml", "http://example.org/")
		let opmlDocument = OPMLParser.document(with: d)
		recursivelyCheckOPMLStructure(opmlDocument!)
	}

}

private extension OPMLTests {

	func recursivelyCheckOPMLStructure(_ item: OPMLItem) {
		let feedSpecifier = item.feedSpecifier
		if !(item is OPMLDocument) {
			XCTAssertNotNil(item.attributes!.opml_text)
		}

		// If it has no children, it should have a feed specifier. The converse is also true.
		var isFolder = item.items != nil && item.items!.count > 0
		if !isFolder && item.attributes?.opml_title == "Skip" {
			isFolder = true
		}

		if !isFolder {
			XCTAssertNotNil(feedSpecifier!.title)
			XCTAssertNotNil(feedSpecifier!.feedURL)
		}
		else {
			XCTAssertNil(feedSpecifier)
		}

		if item.items != nil && item.items!.count > 0 {
			for oneItem in item.items! {
				recursivelyCheckOPMLStructure(oneItem)
			}
		}
	}
}

func parserData(_ filename: String, _ fileExtension: String, _ url: String) -> ParserData {
	let filename = "Resources/\(filename)"
	let path = Bundle.module.path(forResource: filename, ofType: fileExtension)!
	let data = try! Data(contentsOf: URL(fileURLWithPath: path))
	return ParserData(url: url, data: data)
}