1 files changed, 59 insertions, 0 deletions
diff --git a/spawn.go b/spawn.go
new file mode 100644
index 0000000..0ee93d7
--- /dev/null
+++ b/spawn.go
@@ -0,0 +1,59 @@
+package main
+
+import (
+	"age_of_empires/ecs"
+	"age_of_empires/physics"
+	"time"
+)
+
+type spawnRequest struct {
+	start time.Time
+}
+
+type Spawn struct {
+	UnitResourceCost int
+	UnitSpawnDuration time.Duration
+	Requests []spawnRequest
+}
+
+func NewSpawn(unitResourceCost int, unitSpawnDuration time.Duration) Spawn {
+	return Spawn{
+		UnitResourceCost: unitResourceCost,
+		UnitSpawnDuration: unitSpawnDuration,
+		Requests: make([]spawnRequest, 0),
+	}
+}
+
+func (spawn *Spawn) AddRequest(g *Game) {
+	if g.ResourceAmount < spawn.UnitResourceCost {
+		return
+	}
+	g.ResourceAmount -= spawn.UnitResourceCost
+	spawn.Requests = append(spawn.Requests, spawnRequest{start: time.Now()})
+}
+
+func UpdateSpawn(g *Game,spawn *ecs.Component[Spawn], position ecs.Component[physics.Point]) {
+	if !spawn.IsEnabled || !position.IsEnabled {
+		return
+	}
+	now := time.Now()
+	if len(spawn.Value.Requests) == 0 || now.Sub(spawn.Value.Requests[0].start) < time.Duration(spawn.Value.UnitSpawnDuration) {
+		return
+	}
+	// TODO: builder
+	var order Order
+	spawnPosition, _ := g.Closest(position.Value, physics.AdjacentPoints(position.Value))
+	unit := Entity{
+		Position:         ecs.C(spawnPosition),
+		Image:            ecs.C(g.personImage),
+		Selection:        ecs.C(Selection{IsSelected: false, Halo: g.personSelectionHalo}),
+		Move:             ecs.C(physics.Move{IsActive: false}),
+		Order:            ecs.C(order),
+		ResourceGatherer: ecs.C(ResourceGatherer{MaxCapacity: 15}),
+	}
+	g.Entities = append(g.Entities, &unit)
+	spawn.Value.Requests = spawn.Value.Requests[1:]
+	if len(spawn.Value.Requests) > 0 {
+		spawn.Value.Requests[0].start = now
+	}
+}