[WIP]: Make HelloService a bit more varied/conversational

Sources/Camille/HelloService.swift

@@ -1,25 +1,106 @@
 import Bot
 import Sugar
+import Foundation
 
 final class HelloService: SlackMessageService {
     override func messageEvent(slackBot: SlackBot, webApi: WebAPI, message: MessageDecorator, previous: MessageDecorator?) throws {
         guard let target = message.target, let sender = message.sender else { return }
-        
+
         try message.routeText(
             to: self.sayHello(to: sender, in: target, with: webApi),
-            matching: Greeting(name: "greeting"), slackBot.me
+            allowingRemainder: true,
+            matching: Greetings.all.any(name: "greeting"), ",".orNone, slackBot.me
+        )
+
+        try message.routeText(
+            to: self.sayHello(to: sender, in: target, with: webApi),
+            allowingRemainder: true,
+            matching: slackBot.me, [":", ",", "!"].anyOrNone, Greetings.all.any(name: "greeting")
         )
     }
 }
 
 fileprivate extension HelloService {
     func sayHello(to sender: User, in target: SlackTargetType, with webApi: WebAPI) -> (PatternMatchResult) throws -> Void {
         return { match in
+            let senderName = sender.messageSegment
+            let greeting: String
+            let defaultGreetings = ["Hi", "Hello", "hey"]
+            switch (Greetings(rawValue: match.value(named: "greeting")) ?? Greetings.hey) {
+            case .hi, .hello, .hey: greeting = "\(defaultGreetings.randomElement), \(senderName)"
+            case .ohai: greeting = "ohai \(senderName)!"
+            case .morning: greeting = "\((defaultGreetings + ["Good morning", "morning"]).randomElement), \(senderName)!"
+            case .afternoon: greeting = "\((defaultGreetings + ["Good afternoon", "good afternoon"]).randomElement), \(senderName)!"
+            case .evening: greeting = "\((defaultGreetings + ["Good evening", "good evening"]).randomElement), \(senderName)!"
+            case .sup: greeting = "sup \(senderName)"
+            case .going: greeting = [
+                "Not bad, \(senderName), how's things for you?",
+                "Pretty good, \(senderName). How about you?",
+                "I'm incapable of complaints, \(senderName). How're you doing?",
+                "\(defaultGreetings.randomElement), \(senderName)! I'm great, how've _you_ been?"].randomElement
+            }
             let message = try SlackMessage()
-                .line(match.value(named: "greeting"), " ", sender)
+                .line(greeting)
                 .makeChatPostMessage(target: target)
 
             try webApi.execute(message)
         }
     }
 }
+
+fileprivate extension Array {
+    var randomElement: Element {
+        let index = Int(arc4random_uniform(UInt32(self.count)))
+        return self[index]
+    }
+}
+fileprivate enum Greetings: String {
+    case hi
+    case hello
+    case hey
+    case ohai
+    case morning
+    case afternoon
+    case evening
+    case sup
+    case going
+
+    static let all = [
+        "hi", "hello", "hey", // defaults
+        "ohai", "hai", // ohai
+        "morning", "good morning", "mornin", "morning", "mornin'", "good mornin'", // morning
+        "afternoon", "good afternoon", // afternoon
+        "evenin", "evenin'", "evening", "good evening", "good evenin", "good evenin'", // evening
+        "sup", "what's up", "'sup", // sup
+        "how's it going", "how's it goin", "how's it goin'", "hows it goin", "hows it going", // going (pt 1)
+        "how are you", "how're you", "how you doing", "how are you doing", "how are you doin", "how're you doin" // going (pt 2)
+    ]
+
+    init?(rawValue: String) {
+        let rawValue = rawValue.lowercased()
+        if rawValue == "hi" {
+            self = .hi
+        } else if rawValue == "hello" {
+            self = .hello
+        } else if rawValue == "hey" {
+            self = .hey
+        } else if rawValue == "ohai" || rawValue == "hai" {
+            self = Greetings.ohai
+        } else if ["morning", "good morning", "mornin", "morning", "mornin'", "good mornin'"].contains(rawValue) {
+            self = .morning
+        } else if ["afternoon", "good afternoon"].contains(rawValue) {
+            self = .afternoon
+        } else if ["evenin", "evenin'", "evening", "good evening", "good evenin", "good evenin'"].contains(rawValue) {
+            self = .evening
+        } else if ["sup", "what's up", "'sup"].contains(rawValue) {
+            self = .sup
+        } else if [
+            "how's it going", "how's it goin", "how's it goin'", "hows it goin", "hows it going",
+            "how are you", "how're you", "how you doing", "how are you doing", "how are you doin", "how're you doin"
+            ].contains(rawValue) {
+            self = .going
+        } else {
+            return nil
+        }
+    }
+}