From 0c812ce97b6afd7dea263443a0900906ffbf6764 Mon Sep 17 00:00:00 2001
From: Jordan Orelli <jordanorelli@gmail.com>
Date: Mon, 26 Oct 2020 23:52:56 +0000
Subject: [PATCH] world ticking

---
 internal/server/server.go | 11 ++++++++---
 internal/sim/entity.go    |  2 ++
 internal/sim/floor.go     |  8 ++++++++
 internal/sim/player.go    |  5 +++++
 internal/sim/point.go     |  3 +++
 internal/sim/room.go      |  5 ++++-
 internal/sim/tile.go      |  6 ++++++
 internal/sim/world.go     | 40 +++++++++++++++++++++++++++++++++++++++
 internal/ui/buffer.go     | 19 +++++++++++++++++++
 internal/ui/tile.go       | 11 +++++++++++
 10 files changed, 106 insertions(+), 4 deletions(-)
 create mode 100644 internal/sim/floor.go
 create mode 100644 internal/sim/player.go
 create mode 100644 internal/sim/point.go
 create mode 100644 internal/sim/tile.go
 create mode 100644 internal/ui/buffer.go
 create mode 100644 internal/ui/tile.go

diff --git a/internal/server/server.go b/internal/server/server.go
index 62d35ed..2c4c312 100644
--- a/internal/server/server.go
+++ b/internal/server/server.go
@@ -12,15 +12,17 @@ import (
 
 	"github.com/gorilla/websocket"
 	"github.com/jordanorelli/astro-domu/internal/errors"
+	"github.com/jordanorelli/astro-domu/internal/sim"
 	"github.com/jordanorelli/astro-domu/internal/wire"
 	"github.com/jordanorelli/blammo"
 )
 
 type Server struct {
 	*blammo.Log
-	Host string
-	Port int
-	http *http.Server
+	Host  string
+	Port  int
+	http  *http.Server
+	world *sim.World
 
 	sync.Mutex
 	lastSessionID  int
@@ -48,6 +50,9 @@ func (s *Server) Start() error {
 		s.Log = blammo.NewLog("astro", options...).Child("server")
 	}
 
+	s.world = sim.NewWorld(s.Log.Child("world"))
+	go s.world.Run(3)
+
 	addr := fmt.Sprintf("%s:%d", s.Host, s.Port)
 	lis, err := net.Listen("tcp", addr)
 	if err != nil {
diff --git a/internal/sim/entity.go b/internal/sim/entity.go
index 15a45ad..11238d2 100644
--- a/internal/sim/entity.go
+++ b/internal/sim/entity.go
@@ -1,5 +1,7 @@
 package sim
 
+import "time"
+
 // entity is any entity that can be simulated.
 type entity interface {
 	// update is the standard tick function
diff --git a/internal/sim/floor.go b/internal/sim/floor.go
new file mode 100644
index 0000000..75dd2f0
--- /dev/null
+++ b/internal/sim/floor.go
@@ -0,0 +1,8 @@
+package sim
+
+type floor int
+
+const (
+	fl_nothing floor = iota
+	fl_rock
+)
diff --git a/internal/sim/player.go b/internal/sim/player.go
new file mode 100644
index 0000000..625af19
--- /dev/null
+++ b/internal/sim/player.go
@@ -0,0 +1,5 @@
+package sim
+
+// player represents a player character in the simulation
+type player struct {
+}
diff --git a/internal/sim/point.go b/internal/sim/point.go
new file mode 100644
index 0000000..38d7e67
--- /dev/null
+++ b/internal/sim/point.go
@@ -0,0 +1,3 @@
+package sim
+
+type point struct { x, y int }
diff --git a/internal/sim/room.go b/internal/sim/room.go
index a31f9a4..94b1d04 100644
--- a/internal/sim/room.go
+++ b/internal/sim/room.go
@@ -1,4 +1,7 @@
 package sim
 
-type Room struct {
+type room struct {
+	origin point
+	width  int
+	height int
 }
diff --git a/internal/sim/tile.go b/internal/sim/tile.go
new file mode 100644
index 0000000..0977bb2
--- /dev/null
+++ b/internal/sim/tile.go
@@ -0,0 +1,6 @@
+package sim
+
+type tile struct {
+	floor    floor
+	contents []entity
+}
diff --git a/internal/sim/world.go b/internal/sim/world.go
index 3f19aa9..8706334 100644
--- a/internal/sim/world.go
+++ b/internal/sim/world.go
@@ -1,4 +1,44 @@
 package sim
 
+import (
+	"time"
+
+	"github.com/jordanorelli/blammo"
+)
+
+// World is the entire simulated world. A world consists of many rooms.
 type World struct {
+	*blammo.Log
+	rooms []room
+}
+
+func NewWorld(log *blammo.Log) *World {
+	return &World{
+		Log: log,
+		rooms: []room{
+			room{
+				origin: point{0, 0},
+				width:  10,
+				height: 10,
+			},
+		},
+	}
+}
+
+func (w *World) Run(hz int) {
+	period := time.Second / time.Duration(hz)
+	w.Info("starting world with a tick rate of %dhz, frame duration of %v", hz, period)
+	ticker := time.NewTicker(period)
+	lastTick := time.Now()
+	for {
+		select {
+		case <-ticker.C:
+			w.tick(time.Since(lastTick))
+			lastTick = time.Now()
+		}
+	}
+}
+
+func (w *World) tick(d time.Duration) {
+	w.Info("tick. elapsed: %v", d)
 }
diff --git a/internal/ui/buffer.go b/internal/ui/buffer.go
new file mode 100644
index 0000000..fa9cc9a
--- /dev/null
+++ b/internal/ui/buffer.go
@@ -0,0 +1,19 @@
+package ui
+
+// buffer is a rect of tiles
+type buffer struct {
+	width  int
+	height int
+	tiles  []tile
+}
+
+func newBuffer(width, height int) *buffer {
+	return &buffer{
+		width:  width,
+		height: height,
+		tiles:  make([]tile, width*height),
+	}
+}
+
+func (b *buffer) set(x, y int, t tile) { b.tiles[y*b.width+x] = t }
+func (b *buffer) get(x, y int) tile    { return b.tiles[y*b.width+x] }
diff --git a/internal/ui/tile.go b/internal/ui/tile.go
new file mode 100644
index 0000000..787ec6d
--- /dev/null
+++ b/internal/ui/tile.go
@@ -0,0 +1,11 @@
+package ui
+
+import (
+	"github.com/gdamore/tcell/v2"
+)
+
+type tile struct {
+	r     rune
+	combc []rune
+	style tcell.Style
+}