Image Comments Presentation

EssentialFeed/EssentialFeed.xcodeproj/project.pbxproj

@@ -49,6 +49,10 @@
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+		5B7349472D8532C9007F7D5D /* ImageCommentsPresenterTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5B7349462D8532C9007F7D5D /* ImageCommentsPresenterTests.swift */; };
+		5B73494A2D85337A007F7D5D /* ImageCommentsPresenter.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5B7349492D85337A007F7D5D /* ImageCommentsPresenter.swift */; };
+		5B73494C2D853421007F7D5D /* ImageComments.xcstrings in Resources */ = {isa = PBXBuildFile; fileRef = 5B73494B2D853421007F7D5D /* ImageComments.xcstrings */; };
+		5B73494E2D85356B007F7D5D /* ImageCommentsLocalizationTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5B73494D2D85356B007F7D5D /* ImageCommentsLocalizationTests.swift */; };
 		5B74FD1A2D649D0E007478DC /* ErrorView.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5B74FD192D649D0D007478DC /* ErrorView.swift */; };
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 		5B74FD222D6A5F39007478DC /* FeedPresenterTests.swift in Sources */ = {isa = PBXBuildFile; fileRef = 5B74FD212D6A5F39007478DC /* FeedPresenterTests.swift */; };
@@ -199,6 +203,10 @@
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 		5B73493B2D84E463007F7D5D /* ResourceLoadingView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ResourceLoadingView.swift; sourceTree = "<group>"; };
 		5B73493D2D84FA14007F7D5D /* ResourceErrorView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ResourceErrorView.swift; sourceTree = "<group>"; };
+		5B7349462D8532C9007F7D5D /* ImageCommentsPresenterTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageCommentsPresenterTests.swift; sourceTree = "<group>"; };
+		5B7349492D85337A007F7D5D /* ImageCommentsPresenter.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageCommentsPresenter.swift; sourceTree = "<group>"; };
+		5B73494B2D853421007F7D5D /* ImageComments.xcstrings */ = {isa = PBXFileReference; lastKnownFileType = text.json.xcstrings; path = ImageComments.xcstrings; sourceTree = "<group>"; };
+		5B73494D2D85356B007F7D5D /* ImageCommentsLocalizationTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ImageCommentsLocalizationTests.swift; sourceTree = "<group>"; };
 		5B74FD192D649D0D007478DC /* ErrorView.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = ErrorView.swift; sourceTree = "<group>"; };
 		5B74FD1E2D64A821007478DC /* UIRefreshControl+Helpers.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = "UIRefreshControl+Helpers.swift"; sourceTree = "<group>"; };
 		5B74FD212D6A5F39007478DC /* FeedPresenterTests.swift */ = {isa = PBXFileReference; lastKnownFileType = sourcecode.swift; path = FeedPresenterTests.swift; sourceTree = "<group>"; };
@@ -377,6 +385,7 @@
 				5B73491B2D825610007F7D5D /* Shared API Infra */,
 				5B7349172D824BF6007F7D5D /* Image Comments Feature */,
 				5B7349212D825864007F7D5D /* Image Comments API */,
+				5B7349482D853348007F7D5D /* Image Comments Presentation */,
 				5B107E172BF5C12800927709 /* Feed Feature */,
 				5B7BDE002BFA81830002E7F8 /* Feed API */,
 				5B034B312C9A801400FB65F8 /* Feed Cache */,
@@ -393,6 +402,7 @@
 				5B7349292D8439FF007F7D5D /* Shared Presentation */,
 				5B73491E2D825711007F7D5D /* Shared API Infra */,
 				5B7349222D8258A5007F7D5D /* Image Comments API */,
+				5B7349452D853206007F7D5D /* Image Comments Presentation */,
 				5B0E220E2BFE404F009FC3EB /* Feed API */,
 				5B8BD18C2C37985A00CCA870 /* Feed Cache */,
 				5B74FD202D6A5F07007478DC /* Feed Presentation */,
@@ -547,6 +557,24 @@
 			path = "Shared Presentation";
 			sourceTree = "<group>";
 		};
+		5B7349452D853206007F7D5D /* Image Comments Presentation */ = {
+			isa = PBXGroup;
+			children = (
+				5B7349462D8532C9007F7D5D /* ImageCommentsPresenterTests.swift */,
+				5B73494D2D85356B007F7D5D /* ImageCommentsLocalizationTests.swift */,
+			);
+			path = "Image Comments Presentation";
+			sourceTree = "<group>";
+		};
+		5B7349482D853348007F7D5D /* Image Comments Presentation */ = {
+			isa = PBXGroup;
+			children = (
+				5B7349492D85337A007F7D5D /* ImageCommentsPresenter.swift */,
+				5B73494B2D853421007F7D5D /* ImageComments.xcstrings */,
+			);
+			path = "Image Comments Presentation";
+			sourceTree = "<group>";
+		};
 		5B74FD1B2D64A6DE007478DC /* Helpers */ = {
 			isa = PBXGroup;
 			children = (
@@ -889,6 +917,7 @@
 			files = (
 				5B7349332D844B03007F7D5D /* Shared.xcstrings in Resources */,
 				5B8829042D6A7527006E0BD7 /* Feed.xcstrings in Resources */,
+				5B73494C2D853421007F7D5D /* ImageComments.xcstrings in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};
@@ -946,6 +975,7 @@
 				5B7349192D824CC8007F7D5D /* ImageComment.swift in Sources */,
 				5BF9F30D2CDAD64700C8DB96 /* FeedStore.xcdatamodeld in Sources */,
 				5BDE3C672D6C225A005D520D /* CoreDataFeedStore+FeedStore.swift in Sources */,
+				5B73494A2D85337A007F7D5D /* ImageCommentsPresenter.swift in Sources */,
 				5B034B392C9BD2C000FB65F8 /* LocalFeedImage.swift in Sources */,
 				5B8829062D6A7A9A006E0BD7 /* FeedViewModel.swift in Sources */,
 				5B034B352C9A819900FB65F8 /* FeedStore.swift in Sources */,
@@ -985,6 +1015,7 @@
 				5B7AB8D72BF8BCE60034C68B /* FeedItemsMapperTests.swift in Sources */,
 				5B88290D2D6A82D3006E0BD7 /* FeedImagePresenterTests.swift in Sources */,
 				5BF9F3012CD9A10500C8DB96 /* XCTestCase+FailableInsertFeedStoreSpecs.swift in Sources */,
+				5B7349472D8532C9007F7D5D /* ImageCommentsPresenterTests.swift in Sources */,
 				5B8829292D6BF226006E0BD7 /* CacheFeedImageDataUseCaseTests.swift in Sources */,
 				5B88290B2D6A8133006E0BD7 /* FeedLocalizationTests.swift in Sources */,
 				5B304EEA2BFF582400AF431F /* URLSessionHTTPClientTests.swift in Sources */,
@@ -995,6 +1026,7 @@
 				5B8BD18F2C3798D400CCA870 /* CacheFeedUseCaseTests.swift in Sources */,
 				5B7349352D844D6D007F7D5D /* SharedLocalizationTests.swift in Sources */,
 				5B8829262D6BF168006E0BD7 /* FeedImageDataStoreSpy.swift in Sources */,
+				5B73494E2D85356B007F7D5D /* ImageCommentsLocalizationTests.swift in Sources */,
 				5B88292B2D6BF4F0006E0BD7 /* CoreDataFeedImageDataStoreTests.swift in Sources */,
 				5BF9F3032CD9A1C600C8DB96 /* XCTestCase+FailableDeleteFeedStoreSpecs.swift in Sources */,
 				5BF9F2FF2CD99FF300C8DB96 /* XCTestCase+FailableRetrieveFeedStoreSpecs.swift in Sources */,

EssentialFeed/EssentialFeed/Image Comments Presentation/ImageComments.xcstrings

@@ -0,0 +1,30 @@
+{
+  "sourceLanguage" : "en",
+  "strings" : {
+    "IMAGE_COMMENTS_VIEW_TITLE" : {
+      "comment" : "Title for the image comments view",
+      "extractionState" : "manual",
+      "localizations" : {
+        "en" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Comments"
+          }
+        },
+        "es" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Comentarios"
+          }
+        },
+        "pt-BR" : {
+          "stringUnit" : {
+            "state" : "translated",
+            "value" : "Comentários"
+          }
+        }
+      }
+    }
+  },
+  "version" : "1.0"
+}

EssentialFeed/EssentialFeed/Image Comments Presentation/ImageCommentsPresenter.swift

@@ -0,0 +1,50 @@
+//
+// Created by Rodrigo Porto.
+// Copyright © 2025 PortoCode. All Rights Reserved.
+//
+
+import Foundation
+
+public struct ImageCommentsViewModel {
+    public let comments: [ImageCommentViewModel]
+}
+
+public struct ImageCommentViewModel: Equatable {
+    public let message: String
+    public let date: String
+    public let username: String
+
+    public init(message: String, date: String, username: String) {
+        self.message = message
+        self.date = date
+        self.username = username
+    }
+}
+
+public final class ImageCommentsPresenter {
+    public static var title: String {
+        NSLocalizedString(
+            "IMAGE_COMMENTS_VIEW_TITLE",
+            tableName: "ImageComments",
+            bundle: Bundle(for: Self.self),
+            comment: "Title for the image comments view")
+    }
+
+    public static func map(
+        _ comments: [ImageComment],
+        currentDate: Date = Date(),
+        calendar: Calendar = .current,
+        locale: Locale = .current
+    ) -> ImageCommentsViewModel {
+        let formatter = RelativeDateTimeFormatter()
+        formatter.calendar = calendar
+        formatter.locale = locale
+
+        return ImageCommentsViewModel(comments: comments.map { comment in
+            ImageCommentViewModel(
+                message: comment.message,
+                date: formatter.localizedString(for: comment.createdAt, relativeTo: currentDate),
+                username: comment.username)
+        })
+    }
+}

EssentialFeed/EssentialFeedTests/Feed Cache/Helpers/FeedCacheTestHelpers.swift

@@ -25,14 +25,4 @@ extension Date {
     private var feedCacheMaxAgeInDays: Int {
         return 7
     }
-
-    private func adding(days: Int) -> Date {
-        return Calendar(identifier: .gregorian).date(byAdding: .day, value: days, to: self)!
-    }
-}
-
-extension Date {
-    func adding(seconds: TimeInterval) -> Date {
-        return self + seconds
-    }
 }

EssentialFeed/EssentialFeedTests/Helpers/SharedTestHelpers.swift

@@ -27,3 +27,17 @@ extension HTTPURLResponse {
         self.init(url: anyURL(), statusCode: statusCode, httpVersion: nil, headerFields: nil)!
     }
 }
+
+extension Date {
+    func adding(seconds: TimeInterval) -> Date {
+        return self + seconds
+    }
+
+    func adding(minutes: Int, calendar: Calendar = Calendar(identifier: .gregorian)) -> Date {
+        return calendar.date(byAdding: .minute, value: minutes, to: self)!
+    }
+
+    func adding(days: Int, calendar: Calendar = Calendar(identifier: .gregorian)) -> Date {
+        return calendar.date(byAdding: .day, value: days, to: self)!
+    }
+}

EssentialFeed/EssentialFeedTests/Image Comments Presentation/ImageCommentsLocalizationTests.swift

@@ -0,0 +1,18 @@
+//
+// Created by Rodrigo Porto.
+// Copyright © 2025 PortoCode. All Rights Reserved.
+//
+
+import XCTest
+import EssentialFeed
+
+class ImageCommentsLocalizationTests: XCTestCase {
+
+    func test_localizedStrings_haveKeysAndValuesForAllSupportedLocalizations() {
+        let table = "ImageComments"
+        let bundle = Bundle(for: ImageCommentsPresenter.self)
+
+        assertLocalizedKeyAndValuesExist(in: bundle, table)
+    }
+
+}

EssentialFeed/EssentialFeedTests/Image Comments Presentation/ImageCommentsPresenterTests.swift

@@ -0,0 +1,66 @@
+//
+// Created by Rodrigo Porto.
+// Copyright © 2025 PortoCode. All Rights Reserved.
+//
+
+import XCTest
+import EssentialFeed
+
+class ImageCommentsPresenterTests: XCTestCase {
+
+    func test_title_isLocalized() {
+        XCTAssertEqual(ImageCommentsPresenter.title, localized("IMAGE_COMMENTS_VIEW_TITLE"))
+    }
+
+    func test_map_createsViewModels() {
+        let now = Date()
+        let calendar = Calendar(identifier: .gregorian)
+        let locale = Locale(identifier: "en_US_POSIX")
+
+        let comments = [
+            ImageComment(
+                id: UUID(),
+                message: "a message",
+                createdAt: now.adding(minutes: -5, calendar: calendar),
+                username: "a username"),
+            ImageComment(
+                id: UUID(),
+                message: "another message",
+                createdAt: now.adding(days: -1, calendar: calendar),
+                username: "another username")
+        ]
+
+        let viewModel = ImageCommentsPresenter.map(
+            comments,
+            currentDate: now,
+            calendar: calendar,
+            locale: locale
+        )
+
+        XCTAssertEqual(viewModel.comments, [
+            ImageCommentViewModel(
+                message: "a message",
+                date: "5 minutes ago",
+                username: "a username"
+            ),
+            ImageCommentViewModel(
+                message: "another message",
+                date: "1 day ago",
+                username: "another username"
+            )
+        ])
+    }
+
+    // MARK: - Helpers
+
+    private func localized(_ key: String, file: StaticString = #file, line: UInt = #line) -> String {
+        let table = "ImageComments"
+        let bundle = Bundle(for: ImageCommentsPresenter.self)
+        let value = bundle.localizedString(forKey: key, value: nil, table: table)
+        if value == key {
+            XCTFail("Missing localized string for key: \(key) in table: \(table)", file: file, line: line)
+        }
+        return value
+    }
+
+}