Repo created

iphone/Maps/UI/Search/SearchOnMap/SearchOnMapPresenter.swift

@@ -0,0 +1,124 @@
+final class SearchOnMapPresenter {
+  typealias Response = SearchOnMap.Response
+  typealias ViewModel = SearchOnMap.ViewModel
+
+  weak var view: SearchOnMapView?
+
+  private var searchState: SearchOnMapState = .searching {
+    didSet {
+      guard searchState != oldValue else { return }
+      didChangeState?(searchState)
+    }
+  }
+
+  private var viewModel: ViewModel = .initial
+  private var isRouting: Bool
+  private var didChangeState: ((SearchOnMapState) -> Void)?
+
+  init(isRouting: Bool, didChangeState: ((SearchOnMapState) -> Void)?) {
+    self.isRouting = isRouting
+    self.didChangeState = didChangeState
+    didChangeState?(searchState)
+  }
+
+  func process(_ response: SearchOnMap.Response) {
+    guard response != .none else { return }
+
+    if response == .close {
+      view?.close()
+      searchState = .closed
+      return
+    }
+
+    let showSearch = response == .setSearchScreenHidden(false) || response == .showHistoryAndCategory
+    guard viewModel.presentationStep != .hidden || showSearch else {
+      return
+    }
+
+    let newViewModel = resolve(action: response, with: viewModel)
+    if viewModel != newViewModel {
+      viewModel = newViewModel
+      view?.render(newViewModel)
+      searchState = newViewModel.presentationStep.searchState
+    }
+  }
+
+  private func resolve(action: Response, with previousViewModel: ViewModel) -> ViewModel {
+    var viewModel = previousViewModel
+    viewModel.searchingText = nil // should not be nil only when the text is passed to the search field
+
+    switch action {
+    case .startSearching:
+      viewModel.isTyping = true
+      viewModel.skipSuggestions = false
+      viewModel.contentState = .searching
+    case .showOnTheMap:
+      viewModel.isTyping = false
+      viewModel.skipSuggestions = true
+      viewModel.presentationStep = isRouting ? .hidden : .halfScreen
+      if case .results(var results) = viewModel.contentState, !results.isEmpty {
+        results.skipSuggestions()
+        viewModel.contentState = .results(results)
+      }
+    case .setIsTyping(let isSearching):
+      viewModel.isTyping = isSearching
+      if isSearching {
+        viewModel.presentationStep = .fullScreen
+      }
+    case .showHistoryAndCategory:
+      viewModel.isTyping = true
+      viewModel.contentState = .historyAndCategory
+      viewModel.presentationStep = .fullScreen
+    case .showResults(var searchResults, let isSearchCompleted):
+      if (viewModel.skipSuggestions) {
+        searchResults.skipSuggestions()
+      }
+      viewModel.contentState = searchResults.isEmpty && isSearchCompleted ? .noResults : .results(searchResults)
+    case .selectQuery(let query):
+      viewModel.skipSuggestions = false
+      viewModel.searchingText = query.text
+      viewModel.contentState = .searching
+
+      switch query.source {
+      case .typedText, .suggestion:
+        viewModel.isTyping = true
+      case .category, .history, .deeplink:
+        viewModel.isTyping = false
+        viewModel.presentationStep = isRouting ? .hidden : .halfScreen
+      @unknown default:
+        fatalError("Unknown search text source")
+      }
+    case .clearSearch:
+      viewModel.searchingText = ""
+      viewModel.isTyping = true
+      viewModel.skipSuggestions = false
+      viewModel.contentState = .historyAndCategory
+      viewModel.presentationStep = .fullScreen
+    case .setSearchScreenHidden(let isHidden):
+      viewModel.isTyping = false
+      viewModel.presentationStep = isHidden ? .hidden : (isRouting ? .fullScreen : .halfScreen)
+    case .setSearchScreenCompact:
+      viewModel.isTyping = false
+      viewModel.presentationStep = .compact
+    case .updatePresentationStep(let step):
+      if step == .hidden {
+        viewModel.isTyping = false
+      }
+      viewModel.presentationStep = step
+    case .close, .none:
+      break
+    }
+    return viewModel
+  }
+}
+
+private extension ModalPresentationStep {
+  var searchState: SearchOnMapState {
+    switch self {
+    case .fullScreen, .halfScreen, .compact:
+      return .searching
+    case .hidden:
+      return .hidden
+    }
+  }
+}