From 2f883d39b0d3a8ef7dfdbc4f456b207b9617b087 Mon Sep 17 00:00:00 2001
From: Edgaru089 <sjs333@outlook.com>
Date: Thu, 11 Apr 2024 17:01:22 +0800
Subject: [PATCH] WIP file-based level loading

---
 app_file.c           | 47 +++++++++++++++++++++++++++++++++++++++++++-
 particle.c           | 12 +++++++++++
 particle.h           |  3 +++
 render_bundle_file.c |  2 +-
 4 files changed, 62 insertions(+), 2 deletions(-)

diff --git a/app_file.c b/app_file.c
index c18e57a..3a73a22 100644
--- a/app_file.c
+++ b/app_file.c
@@ -1,6 +1,7 @@
 
 #include <stdio.h>
 #include "app.h"
+#include "particle.h"
 #include "types.h"
 
 
@@ -12,5 +13,49 @@ void app_QueueLoadLevel(App *app, const char *level_name) {
 	app->switch_level = copy_malloc(level_name);
 }
 
-void _app_SwitchLevel(App *app) {
+
+#define CMD1(str)    if (strcmp(cmd, str) == 0)
+#define CMD(str)     else if (strcmd(cmd, str) == 0)
+#define TOKEN        (strtok(NULL, " "))
+#define TOKEN_INT    (atoi(TOKEN))
+#define TOKEN_DOUBLE (strtod(TOKEN))
+
+// Subsequent tokens can be read by strtok(NULL, " ")
+static void _app_LevelCommand(char *cmd) {
+}
+
+
+// Defined in render_bundle_file.c
+extern char linebuf[512];
+
+void _app_SwitchLevel(App *app) {
+	if (app->switch_level == NULL) {
+		WARN("called when switch_level is NULL", 0);
+		return;
+	}
+
+	FILE *f = fopen(app->switch_level, "r");
+	if (!f) {
+		WARN("failed to open file\"%s\"", app->switch_level);
+		return;
+	}
+
+	// Clear the current level
+	entity_Clear(app->entity);
+	particle_Clear(app->particle);
+
+	// Read every line
+	while (!feof(f) && fgets(linebuf, sizeof(linebuf), f)) {
+		while (linebuf[strlen(linebuf) - 1] == '\n')
+			linebuf[strlen(linebuf) - 1] = '\0';
+
+		char *cmd = strtok(linebuf, " ");
+		if (cmd == NULL)
+			continue;
+		_app_LevelCommand(cmd);
+	}
+
+
+	free(app->switch_level);
+	app->switch_level = NULL;
 }
diff --git a/particle.c b/particle.c
index d739118..14b8415 100644
--- a/particle.c
+++ b/particle.c
@@ -3,6 +3,7 @@
 #include "types.h"
 #include "util/tree.h"
 #include "util/vector.h"
+#include "util/assert.h"
 #include <stdio.h>
 
 
@@ -78,3 +79,14 @@ void particle_Emit(System_Particle *sys, Vec2 pos, Vec2 vec, double vec_friction
 	p->sizedec      = sizedec;
 	p->mode         = fill;
 }
+
+
+void particle_Clear(System_Particle *sys) {
+	vector_Clear(sys->deleted_ids);
+	// Delete every first node
+	int count = tree_Count(sys->parts);
+	while (count--)
+		tree_Delete(sys->parts, tree_FirstNode(sys->parts));
+
+	ASSERT(tree_Count(sys->parts) == 0);
+}
diff --git a/particle.h b/particle.h
index 3ce6813..9ad2234 100644
--- a/particle.h
+++ b/particle.h
@@ -46,6 +46,9 @@ void particle_Render(System_Particle *sys);
 void particle_Emit(System_Particle *sys, Vec2 pos, Vec2 vec, double vec_friction, double size, double sizedec, Duration tolive, const FillMode *fill);
 void particle_Delete(System_Particle *sys, uintptr_t id);
 
+// Clear all particles.
+void particle_Clear(System_Particle *sys);
+
 
 #ifdef __cplusplus
 }
diff --git a/render_bundle_file.c b/render_bundle_file.c
index 8a9734f..3ef075e 100644
--- a/render_bundle_file.c
+++ b/render_bundle_file.c
@@ -110,7 +110,7 @@ static void _render_BundleCommand(char *cmd) {
 }
 
 
-static char linebuf[512];
+char linebuf[512];
 
 void render_LoadBundle(const char *filename) {
 	if (!render_Bundles)