package services

import (
	"git.saqut.com/saqut/mwse/internal/protocol"
	"git.saqut.com/saqut/mwse/internal/ws"
)

func registerRoom(hub *ws.Hub) {
	// Every client gets a private room named after its own id on connect, and is
	// ejected from all rooms on disconnect.
	hub.OnConnect(func(c *ws.Client) {
		room := ws.NewRoom(hub)
		room.ID = c.ID
		room.AccessType = "private"
		room.JoinType = "notify"
		room.Description = "Private room"
		room.Name = "Your Room | " + c.ID
		room.OwnerID = c.ID
		room.Publish()
		room.Join(c)
	})

	hub.OnDisconnect(func(c *ws.Client) {
		if room, ok := hub.Room(c.ID); ok {
			room.Eject(c)
		}
		for _, rid := range c.Rooms() {
			if r, ok := hub.Room(rid); ok {
				r.Eject(c)
			}
		}
		// Clear any pending invites so a room's waiting list cannot retain the id
		// of a client that has gone away.
		for _, rid := range c.WaitingRooms() {
			if r, ok := hub.Room(rid); ok {
				r.RemoveWaiting(c.ID)
			}
		}
	})

	hub.Register("myroom-info", func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.Room(c.ID)
		if !ok {
			return fail("NOT-FOUND-ROOM")
		}
		return map[string]any{"status": "success", "room": room.ToJSON(false)}
	})

	hub.Register("room-peers", func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.Room(m.Str("roomId"))
		if !ok {
			return map[string]any{"status": "fail"}
		}
		return map[string]any{"status": "success", "peers": ids(room.FilterPeers(toMap(m.Get("filter"))))}
	})

	hub.Register("room/peer-count", func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.Room(m.Str("roomId"))
		if !ok {
			return map[string]any{"status": "fail"}
		}
		return map[string]any{"status": "success", "count": len(room.FilterPeers(toMap(m.Get("filter"))))}
	})

	hub.Register("room-info", func(c *ws.Client, m protocol.Message) any {
		if room, ok := hub.RoomByName(m.Str("name")); ok {
			return map[string]any{"status": "success", "room": room.ToJSON(false)}
		}
		return fail("NOT-FOUND-ROOM")
	})

	hub.Register("joinedrooms", func(c *ws.Client, m protocol.Message) any {
		var rooms []map[string]any
		for _, rid := range c.Rooms() {
			if r, ok := hub.Room(rid); ok {
				rooms = append(rooms, r.ToJSON(false))
			}
		}
		return rooms
	})

	hub.Register("closeroom", func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.Room(m.Str("roomId"))
		if !ok {
			return map[string]any{"status": "fail"}
		}
		if room.OwnerID == c.ID {
			room.Down()
			return success()
		}
		return map[string]any{"status": "fail"}
	})

	hub.Register("create-room", func(c *ws.Client, m protocol.Message) any {
		if msg := validateCreateRoom(m); msg != "" {
			return map[string]any{"status": "fail", "messages": msg}
		}
		name := m.Str("name")
		if existing, exists := hub.RoomByName(name); exists {
			// ifexistsJoin: instead of failing on a name clash, join the existing
			// room (so "create or join" is a single round trip).
			if m.Truthy("ifexistsJoin") {
				existing.Join(c)
				return map[string]any{"status": "success", "room": existing.ToJSON(false)}
			}
			return fail("ALREADY-EXISTS")
		}

		room := ws.NewRoom(hub)
		room.AccessType = m.Str("accessType")
		room.NotifyActionInvite = m.Truthy("notifyActionInvite")
		room.NotifyActionJoined = m.Truthy("notifyActionJoined")
		room.NotifyActionEjected = m.Truthy("notifyActionEjected")
		room.JoinType = m.Str("joinType")
		room.Description = m.Str("description")
		room.Name = name
		room.OwnerID = c.ID
		if cred := m.Str("credential"); cred != "" {
			room.Credential = sha256hex(cred)
		}
		room.Publish()
		room.Join(c)
		return map[string]any{"status": "success", "room": room.ToJSON(false)}
	})

	hub.Register("joinroom", func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.RoomByName(m.Str("name"))
		if !ok {
			return fail("NOT-FOUND-ROOM")
		}

		fetchInfo := func(resp map[string]any) map[string]any {
			if m.Truthy("autoFetchInfo") {
				resp["info"] = room.Info()
			}
			return resp
		}

		switch room.JoinType {
		case "lock":
			return fail("LOCKED-ROOM")
		case "password":
			if room.Credential == sha256hex(m.Str("credential")) {
				room.Join(c)
				return fetchInfo(map[string]any{"status": "success", "room": room.ToJSON(false)})
			}
			return map[string]any{"status": "fail", "message": "WRONG-PASSWORD", "area": "credential"}
		case "free":
			room.Join(c)
			return fetchInfo(map[string]any{"status": "success", "room": room.ToJSON(false)})
		case "invite":
			room.AddWaiting(c.ID)
			c.AddWaitingRoom(room.ID)
			invite := map[string]any{"id": c.ID}
			if room.NotifyActionInvite {
				room.Broadcast("room/invite", invite, "", nil)
			} else if owner, ok := hub.Client(room.OwnerID); ok {
				owner.Signal("room/invite", invite)
			}
			return map[string]any{"status": "success", "message": "INVITE-REQUESTED"}
		}
		return fail("NOT-FOUND-ROOM")
	})

	hub.Register("ejectroom", func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.Room(m.Str("roomId"))
		if !ok {
			return fail("NOT-FOUND-ROOM")
		}
		if !room.Has(c.ID) {
			return fail("ALREADY-ROOM-OUT")
		}
		room.Eject(c)
		return success()
	})

	hub.Register("accept/invite-room", inviteDecision(hub, true))
	hub.Register("reject/invite-room", inviteDecision(hub, false))

	hub.Register("room/list", func(c *ws.Client, m protocol.Message) any {
		var rooms []map[string]any
		for _, room := range hub.Rooms() {
			if room.AccessType == "public" {
				rooms = append(rooms, map[string]any{
					"name":        room.Name,
					"joinType":    room.JoinType,
					"description": room.Description,
					"id":          room.ID,
				})
			}
		}
		return map[string]any{"type": "public/rooms", "rooms": rooms}
	})

	hub.Register("room/info", func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.Room(m.Str("roomId"))
		if !ok {
			return fail("NOT-FOUND-ROOM")
		}
		if !c.InRoom(room.ID) {
			return fail("NO-JOINED-ROOM")
		}
		if name := m.Str("name"); name != "" {
			v, _ := room.InfoValue(name)
			return map[string]any{"status": "success", "value": v}
		}
		return map[string]any{"status": "success", "value": room.Info()}
	})

	hub.Register("room/setinfo", func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.Room(m.Str("roomId"))
		if !ok {
			return fail("NOT-FOUND-ROOM")
		}
		if !c.InRoom(room.ID) {
			return fail("NO-JOINED-ROOM")
		}
		name := m.Str("name")
		value := m.Get("value")
		room.SetInfo(name, value)
		room.Broadcast(
			"room/info",
			map[string]any{"name": name, "value": value, "roomId": room.ID},
			c.ID,
			(*ws.Client).RoomInfoNotifiable,
		)
		return success()
	})
}

// inviteDecision builds the accept/reject invite handlers. The original code was
// non-functional here (it called Array methods on a Set and inverted the joinType
// check); this implements the intended flow: only the rooms a member belongs to,
// only invite rooms, only ids actually on the waiting list.
func inviteDecision(hub *ws.Hub, accept bool) handler {
	return func(c *ws.Client, m protocol.Message) any {
		room, ok := hub.Room(m.Str("roomId"))
		if !ok {
			return fail("NOT-FOUND-ROOM")
		}
		if !c.InRoom(room.ID) {
			return fail("FORBIDDEN-INVITE-ACTIONS")
		}
		if room.JoinType != "invite" {
			return fail("INVALID-DATA")
		}
		clientID := m.Str("clientId")
		if !room.IsWaiting(clientID) {
			return fail("NO-WAITING-INVITED")
		}
		joinClient, ok := hub.Client(clientID)
		if !ok {
			room.RemoveWaiting(clientID)
			return fail("NO-CLIENT")
		}
		room.RemoveWaiting(clientID)
		joinClient.RemoveWaitingRoom(room.ID)

		if accept {
			room.Join(joinClient)
			joinClient.Signal("room/invite/status", map[string]any{"status": "accepted"})
		} else {
			room.Broadcast("room/invite/status", map[string]any{"id": clientID, "roomId": room.ID}, "", nil)
			joinClient.Signal("room/invite/status", map[string]any{"status": "rejected"})
		}
		return success()
	}
}

// validateCreateRoom checks the create-room payload against the same constraints
// the original joi schema described. It returns an empty string when valid.
func validateCreateRoom(m protocol.Message) string {
	if !m.Has("type") {
		return "type is required"
	}
	switch m.Str("accessType") {
	case "public", "private":
	default:
		return "accessType must be public or private"
	}
	switch m.Str("joinType") {
	case "free", "invite", "password", "lock":
	default:
		return "joinType must be one of free, invite, password, lock"
	}
	if !m.Has("notifyActionInvite") || !m.Has("notifyActionJoined") || !m.Has("notifyActionEjected") {
		return "notify flags are required"
	}
	if m.Str("description") == "" {
		return "description is required"
	}
	if m.Str("name") == "" {
		return "name is required"
	}
	return ""
}