Add native iOS notifications (#64)

ios/Sources/AppContext.swift

@@ -4,6 +4,7 @@ import WidgetKit
 @MainActor
 final class AppContext {
     let core: GotchaCore
+    lazy var notifications = NotificationCoordinator(context: self)
     private let window: UIWindow
     private(set) var tabs = UITabBarController()
     private(set) var navigationControllers: [UINavigationController] = []
@@ -96,14 +97,77 @@ final class AppContext {
     }
 
     func route(_ activity: ActivityRow) {
+        route(
+            serverId: nil,
+            target: activity.target,
+            owner: activity.owner,
+            repository: activity.repository,
+            number: activity.number,
+            sha: activity.sha
+        )
+    }
+
+    func route(_ notification: NotificationRow) {
+        route(
+            serverId: notification.serverId,
+            target: notification.target,
+            owner: notification.owner,
+            repository: notification.repository,
+            number: notification.number,
+            sha: notification.sha
+        )
+    }
+
+    func route(notificationUserInfo userInfo: [AnyHashable: Any]) {
+        let target: ActivityTargetKind
+        switch userInfo["target"] as? String {
+        case "repository": target = .repository
+        case "issue": target = .issue
+        case "pull": target = .pullRequest
+        case "commit": target = .commit
+        default: target = .none
+        }
+        route(
+            serverId: userInfo["serverId"] as? String,
+            target: target,
+            owner: userInfo["owner"] as? String ?? "",
+            repository: userInfo["repository"] as? String ?? "",
+            number: (userInfo["number"] as? NSNumber)?.int64Value ?? 0,
+            sha: userInfo["sha"] as? String ?? ""
+        )
+    }
+
+    private func route(
+        serverId: String?,
+        target: ActivityTargetKind,
+        owner: String,
+        repository: String,
+        number: Int64,
+        sha: String
+    ) {
+        if let serverId {
+            guard let index = core.servers().firstIndex(where: { $0.id == serverId }) else {
+                tabs.present(errorAlert("That notification's server is no longer configured."), animated: true)
+                return
+            }
+            if core.activeServerIndex() != UInt32(index) {
+                do {
+                    try selectServer(index: UInt32(index))
+                } catch {
+                    tabs.present(errorAlert(error.localizedDescription), animated: true)
+                    return
+                }
+            }
+        }
         let navigation = navigationControllers[0]
-        switch activity.target {
+        tabs.selectedIndex = 0
+        switch target {
         case .repository:
             navigation.pushViewController(
                 IssuesViewController(
                     context: self,
-                    owner: activity.owner,
-                    repository: activity.repository
+                    owner: owner,
+                    repository: repository
                 ),
                 animated: true
             )
@@ -111,9 +175,9 @@ final class AppContext {
             navigation.pushViewController(
                 IssueViewController(
                     context: self,
-                    owner: activity.owner,
-                    repository: activity.repository,
-                    number: activity.number
+                    owner: owner,
+                    repository: repository,
+                    number: number
                 ),
                 animated: true
             )
@@ -121,9 +185,9 @@ final class AppContext {
             navigation.pushViewController(
                 PullViewController(
                     context: self,
-                    owner: activity.owner,
-                    repository: activity.repository,
-                    number: activity.number
+                    owner: owner,
+                    repository: repository,
+                    number: number
                 ),
                 animated: true
             )
@@ -131,9 +195,9 @@ final class AppContext {
             navigation.pushViewController(
                 FilesViewController(
                     context: self,
-                    owner: activity.owner,
-                    repository: activity.repository,
-                    sha: activity.sha
+                    owner: owner,
+                    repository: repository,
+                    sha: sha
                 ),
                 animated: true
             )