--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/libmlk-adventure/adventure/state/battle.c	Wed Dec 23 15:37:48 2020 +0100
@@ -0,0 +1,101 @@
+/*
+ * battle.c -- manage a battle
+ *
+ * Copyright (c) 2020 David Demelier <markand@malikania.fr>
+ *
+ * Permission to use, copy, modify, and/or distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#include <assert.h>
+#include <stdlib.h>
+
+#include <core/alloc.h>
+#include <core/game.h>
+#include <core/painter.h>
+#include <core/state.h>
+
+#include <rpg/battle.h>
+
+#include "battle.h"
+
+struct self {
+	struct battle *battle;
+	struct state state;
+};
+
+static void
+start(struct state *state)
+{
+	struct self *self = state->data;
+
+	battle_start(self->battle);
+}
+
+static void
+handle(struct state *state, const union event *ev)
+{
+	struct self *self = state->data;
+
+	battle_handle(self->battle, ev);
+}
+
+static void
+update(struct state *state, unsigned int ticks)
+{
+	struct self *self = state->data;
+
+	/* TODO: once we have stacked states, pop it. */
+	if (battle_update(self->battle, ticks))
+		game_quit();
+}
+
+static void
+draw(struct state *state)
+{
+	struct self *self = state->data;
+
+	painter_set_color(0xffffffff);
+	painter_clear();
+	battle_draw(self->battle);
+	painter_present();
+}
+
+static void
+finish(struct state *state)
+{
+	struct self *self = state->data;
+
+	battle_finish(self->battle);
+
+	free(self->battle);
+	free(self);
+}
+
+struct state *
+state_battle_new(struct battle *bt)
+{
+	assert(bt);
+
+	struct self *self;
+
+	self = alloc_new0(sizeof (*self));
+	self->battle = bt;
+	self->state.data = self;
+	self->state.start = start;
+	self->state.handle = handle;
+	self->state.update = update;
+	self->state.draw = draw;
+	self->state.finish = finish;
+
+	return &self->state;
+}