// The MIT License
//
// Original work sponsored and donated by The Danish Health Data Authority (http://www.sundhedsdatastyrelsen.dk)
//
// Copyright (C) 2020 The Danish Health Data Authority (http://www.sundhedsdatastyrelsen.dk)
//
// Permission is hereby granted, free of charge, to any person obtaining a copy of
// this software and associated documentation files (the "Software"), to deal in
// the Software without restriction, including without limitation the rights to
// use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
// of the Software, and to permit persons to whom the Software is furnished to do
// so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

import XCTest
import Combine
import ErrorData
import CMSData
@testable import CMSServices

final class CMSTests: XCTestCase {
    private var cancelBag = Set<AnyCancellable>()

    func testEmptyFallback() {
        let fallbackExpect = XCTestExpectation(description: "Fallback to empty dictionary instance on fail")
        let failExpect = XCTestExpectation(description: "Dictionary should fail")

        let failingDictionaryService = FailingDictionaryService()
        failingDictionaryService.fetchDictionaryWithEmptyFallback()
            .sink { (dic: CMSDictionary) in
                fallbackExpect.fulfill()
            }
            .store(in: &cancelBag)

        failingDictionaryService.fetchDictionary()
            .sink { (completion) in
                switch completion {
                case .failure:
                    failExpect.fulfill()
                case .finished:
                    XCTFail("Should have failed, but finished.")
                }
            } receiveValue: { _ in
                XCTFail("Dictionary should have failed.")
            }.store(in: &cancelBag)

        wait(for: [failExpect, fallbackExpect], timeout: 1.0)
    }

    static var allTests = [
        ("testEmptyFallback", testEmptyFallback),
    ]
}


private final class FailingDictionaryService: DictionaryService {
    func fetchDictionary() -> AnyPublisher<CMSDictionary, ServiceError> {
        Fail(error: ServiceError.failedToParseJson)
            .eraseToAnyPublisher()
    }
}