From ef1ba61ca79e8348d782a3298fcbd97a0bdb7dc5 Mon Sep 17 00:00:00 2001
From: Kevin Chabowski <kevin@kch42.de>
Date: Mon, 24 Mar 2014 20:53:46 +0100
Subject: Chatrooms roughly implemented

---
 buddy.go | 10 +++++++
 main.go  |  9 ++++++
 rooms.go | 96 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 115 insertions(+)
 create mode 100644 buddy.go
 create mode 100644 rooms.go

diff --git a/buddy.go b/buddy.go
new file mode 100644
index 0000000..0d1fb0c
--- /dev/null
+++ b/buddy.go
@@ -0,0 +1,10 @@
+package main
+
+type Buddy struct {
+	Nick    string
+	Receive chan Message
+}
+
+func NewBuddy(nick string, room *Room) *Buddy {
+	// TODO: Implement me!
+}
diff --git a/main.go b/main.go
index c18959a..b546da4 100644
--- a/main.go
+++ b/main.go
@@ -3,6 +3,8 @@ package main
 import (
 	"flag"
 	"github.com/gorilla/mux"
+	"log"
+	"math"
 	"net/http"
 )
 
@@ -10,11 +12,18 @@ var (
 	laddr      = flag.String("laddr", ":8080", "Listen on this address")
 	tplpath    = flag.String("tplpath", "tpls", "Path to templates")
 	staticpath = flag.String("staticpath", "static", "Path to static page elements")
+	perroom    = flag.Int("perroom", -1, "Maximum amount of users per room (negative for unlimited)")
 )
 
 func main() {
 	flag.Parse()
 
+	if *perroom < 0 {
+		*perroom = math.MaxInt32
+	} else if *perroom == 0 {
+		log.Fatalln("flag perroom must not be 0")
+	}
+
 	r := mux.NewRouter()
 	r.HandleFunc("/", Home)
 	r.PathPrefix("/static").Handler(http.StripPrefix("/static/", http.FileServer(http.Dir(*staticpath))))
diff --git a/rooms.go b/rooms.go
new file mode 100644
index 0000000..4aa8542
--- /dev/null
+++ b/rooms.go
@@ -0,0 +1,96 @@
+package main
+
+import (
+	"encoding/json"
+	"errors"
+)
+
+type MsgType int
+
+const (
+	MsgChat MsgType = iota // Default
+	MsgJoin
+	MsgLeave
+)
+
+func (mt *MsgType) MarshalJSON() ([]byte, error) {
+	switch *mt {
+	case MsgChat:
+		return json.Marshal("chat")
+	case MsgJoin:
+		return json.Marshal("join")
+	case MsgLeave:
+		return json.Marshal("leave")
+	}
+
+	return nil, errors.New("Unknown message type")
+}
+
+type Message struct {
+	Type MsgType `json:"type"`
+	User string  `json:"user"`
+	Text string  `json:"text,omitempty"`
+}
+
+type Room struct {
+	Messages chan Message
+	Buddies  map[string]Buddy
+}
+
+func NewRoom() (r *Room) {
+	r = new(Room)
+	r.Messages = make(chan Message)
+	r.Buddies = make(map[string]Buddy)
+	go r.Broadcast()
+}
+
+func (r *Room) Leave(nick string) {
+	if _, ok := r.Buddies[nick]; !ok {
+		return
+	}
+
+	delete(r.Buddies[nick])
+	if len(r.Buddies) == 0 {
+		close(r.Messages)
+	} else {
+		r.Messages <- Message{
+			Type: MsgLeave,
+			From: nick,
+		}
+	}
+}
+
+func (r *Room) Broadcast() {
+	for m := range r.Messages {
+		for _, buddy := range r.Buddies {
+			buddy.Receive <- m // TODO: What happens when this locks?
+		}
+	}
+}
+
+var rooms = make(map[string]Room)
+
+func Join(room, nick string) (*Buddy, error) {
+	r, ok := rooms[room]
+	if !ok {
+		r = NewRoom()
+		rooms[room] = r
+	}
+
+	if _, there := r.Buddies[nick]; there {
+		return nil, errors.New("Nickname is already in use")
+	}
+
+	if len(r.Buddies) >= *perroom {
+		return nil, errors.New("Room is full")
+	}
+
+	r.Messages <- Message{
+		Type: MsgJoin,
+		From: nick,
+	}
+
+	b := NewBuddy(nick, r)
+	r.Buddies[nick] = b
+	return b, nil
+}
-- 
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