//
//  MetadataParser.swift
//  AudioStreamingTests
//
//  Created by Dimitrios Chatzieleftheriou on 01/06/2020.
//  Copyright © 2020 Decimal. All rights reserved.
//

import XCTest

@testable import AudioStreaming

class MetadataParserTests: XCTestCase {
    /// NOTE: Usual metadata values from icy stream are in the following format
    /// "StreamTtitle='A song title - Artist';StreamProducer='A producer'"

    func testParserOutputsCorrectResultFromCorrectData() throws {
        let string = "StreamTitle='A song - Artist';StreamSong='A song';StreamArtist='Artist';"
        let data = string.data(using: .utf8)!

        let parser = MetadataParser()

        let output = parser.parse(input: data)

        switch output {
        case let .success(values):
            XCTAssertFalse(values.isEmpty)
            XCTAssertEqual(values["StreamTitle"], "A song - Artist")
            XCTAssertEqual(values["StreamSong"], "A song")
            XCTAssertEqual(values["StreamArtist"], "Artist")
        case .failure:
            XCTFail()
        }
    }

    func testParserOutputsCorrectResultFromActualRawDataOfAudioStream() throws {
        let string = "StreamTitle=\'Gramatik - In This Whole World (Original Mix)\';\0\0\0\0"
        let data = string.data(using: .utf8)!

        let parser = MetadataParser()

        let output = parser.parse(input: data)

        switch output {
        case let .success(values):
            XCTAssertFalse(values.isEmpty)
            XCTAssertEqual(values["StreamTitle"], "Gramatik - In This Whole World (Original Mix)")
        case .failure:
            XCTFail()
        }
    }

    func testParserOutputsFailureOnEmptyStringData() throws {
        let data = "".data(using: .utf8)!
        let parser = MetadataParser()

        let output = parser.parse(input: data)

        switch output {
        case .success:
            XCTFail()
        case let .failure(error):
            XCTAssertEqual(error, MetadataParsingError.empty)
        }
    }
}