/*
 * Kiwix Android
 * Copyright (c) 2020 Kiwix <android.kiwix.org>
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program. If not, see <http://www.gnu.org/licenses/>.
 *
 */

package org.kiwix.kiwixmobile.core.search.viewmodel

import io.mockk.every
import io.mockk.mockk
import kotlinx.coroutines.test.runTest
import org.assertj.core.api.Assertions.assertThat
import org.junit.jupiter.api.Test
import org.kiwix.kiwixmobile.core.search.adapter.SearchListItem.RecentSearchListItem
import org.kiwix.kiwixmobile.core.search.viewmodel.SearchOrigin.FromWebView

internal class SearchStateTest {

  @Test
  internal fun `visibleResults use searchResults when searchTerm is not empty`() = runTest {
    val searchTerm = "notEmpty"
    val pageUrl = ""
    val suggestionSearchWrapper: SuggestionSearchWrapper = mockk()
    val searchIteratorWrapper: SuggestionIteratorWrapper = mockk()
    val entryWrapper: SuggestionItemWrapper = mockk()
    val estimatedMatches = 100
    every { suggestionSearchWrapper.estimatedMatches } returns estimatedMatches.toLong()
    // Settings list to hasNext() to ensure it returns true only for the first call.
    // Otherwise, if we do not set this, the method will always return true when checking if the iterator has a next value,
    // causing our test case to get stuck in an infinite loop due to this explicit setting.
    every { searchIteratorWrapper.hasNext() } returnsMany listOf(true, false)
    every { searchIteratorWrapper.next() } returns entryWrapper
    every { entryWrapper.title } returns searchTerm
    every { entryWrapper.path } returns pageUrl
    every {
      suggestionSearchWrapper.getResults(
        0,
        estimatedMatches
      )
    } returns searchIteratorWrapper
    assertThat(
      SearchState(
        searchTerm,
        SearchResultsWithTerm("", suggestionSearchWrapper),
        emptyList(),
        FromWebView
      ).getVisibleResults(0)
    ).isEqualTo(listOf(RecentSearchListItem(searchTerm, "")))
  }

  @Test
  internal fun `visibleResults use recentResults when searchTerm is empty`() = runTest {
    val results = listOf(RecentSearchListItem("", ""))
    assertThat(
      SearchState(
        "",
        SearchResultsWithTerm("", null),
        results,
        FromWebView
      ).getVisibleResults(0)
    ).isEqualTo(results)
  }

  @Test
  internal fun `isLoading when searchTerm is not equal to ResultTerm`() {
    assertThat(
      SearchState(
        "",
        SearchResultsWithTerm("notEqual", null),
        emptyList(),
        FromWebView
      ).isLoading
    ).isTrue
  }

  @Test
  internal fun `is not Loading when searchTerm is equal to ResultTerm`() {
    val searchTerm = "equal"
    assertThat(
      SearchState(
        searchTerm,
        SearchResultsWithTerm(searchTerm, null),
        emptyList(),
        FromWebView
      ).isLoading
    ).isFalse
  }
}
