various: persist seed display; fix seed 0 handling

Signed-off-by: NotAShelf <raf@notashelf.dev>
Change-Id: I349ed28a792d4de685f8468eddd33a136a6a6964

src/main.c

@@ -10,6 +10,7 @@
 #include "render.h"
 #include "rng.h"
 #include "settings.h"
+#include <ctype.h>
 #include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
@@ -486,6 +487,10 @@ static int handle_input(GameState *gs) {
     // Generate a new random seed for the new run
     gs->run_seed = (unsigned int)time(NULL);
     init_floor(gs, 1);
+    // Update window title with new seed
+    char title[128];
+    snprintf(title, sizeof(title), "Roguelike - Seed: %u", gs->run_seed);
+    SetWindowTitle(title);
     return 0;
   }
 
@@ -546,6 +551,10 @@ static void game_loop(unsigned int run_seed) {
         gs.game_won = 0;
         load_audio_assets(&gs);
         init_floor(&gs, 1);
+        // Update window title with new seed
+        char title[128];
+        snprintf(title, sizeof(title), "Roguelike - Seed: %u", gs.run_seed);
+        SetWindowTitle(title);
       }
     }
 
@@ -588,6 +597,9 @@ static void game_loop(unsigned int run_seed) {
       render_message(gs.last_message);
     }
 
+    // Draw persistent seed display in top right
+    render_seed_display(gs.run_seed);
+
     // Draw game over screen
     if (gs.game_over) {
       // Compute final score
@@ -608,18 +620,50 @@ static void game_loop(unsigned int run_seed) {
   }
 }
 
+// Check if a string is a valid unsigned integer
+static int is_valid_uint(const char *str) {
+  if (str == NULL || *str == '\0')
+    return 0;
+  // Check for optional leading +
+  if (*str == '+')
+    str++;
+  // Must have at least one digit
+  if (*str == '\0')
+    return 0;
+  // All characters must be digits
+  for (const char *p = str; *p != '\0'; p++) {
+    if (!isdigit((unsigned char)*p))
+      return 0;
+  }
+  return 1;
+}
+
 int main(int argc, char **argv) {
   // Parse command-line arguments
   unsigned int run_seed = 0;
+  int seed_provided = 0;
+
   for (int i = 1; i < argc; i++) {
-    if (strcmp(argv[i], "--seed") == 0 && i + 1 < argc) {
-      run_seed = (unsigned int)atoi(argv[i + 1]);
+    if (strcmp(argv[i], "--seed") == 0) {
+      if (i + 1 >= argc) {
+        fprintf(stderr, "Error: --seed requires a value\n");
+        fprintf(stderr, "Usage: %s [--seed <number>]\n", argv[0]);
+        return 1;
+      }
+      const char *seed_str = argv[i + 1];
+      if (!is_valid_uint(seed_str)) {
+        fprintf(stderr, "Error: Invalid seed value: %s\n", seed_str);
+        fprintf(stderr, "Seed must be a non-negative integer\n");
+        return 1;
+      }
+      run_seed = (unsigned int)strtoul(seed_str, NULL, 10);
+      seed_provided = 1;
       i++;  // Skip the value
     }
   }
 
   // If no seed provided, generate random seed from time
-  if (run_seed == 0) {
+  if (!seed_provided) {
     run_seed = (unsigned int)time(NULL);
   }
 
@@ -629,8 +673,10 @@ int main(int argc, char **argv) {
   audio_init();
   // Initialize random number generator
   SetRandomSeed(88435);
-  // Initialize window
-  InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT + 60, "Roguelike");
+  // Initialize window with seed in title
+  char title[128];
+  snprintf(title, sizeof(title), "Roguelike - Seed: %u", run_seed);
+  InitWindow(SCREEN_WIDTH, SCREEN_HEIGHT + 60, title);
   SetTargetFPS(60);
 
   // Run game

src/render.c

@@ -679,3 +679,18 @@ void render_message(const char *message) {
 
   DrawText(message, text_x, text_y, font_size, WHITE);
 }
+
+void render_seed_display(unsigned int seed) {
+  char seed_text[64];
+  snprintf(seed_text, sizeof(seed_text), "Seed: %u", seed);
+
+  const int font_size = 14;
+  int text_width = MeasureText(seed_text, font_size);
+
+  // Position at top right with padding
+  int x = SCREEN_WIDTH - text_width - 10;
+  int y = 5;
+
+  // Draw with non-obstructive dim text color
+  DrawText(seed_text, x, y, font_size, TEXT_DIM);
+}

src/render.h

@@ -1,3 +1,4 @@
+
 #ifndef RENDER_H
 #define RENDER_H
 
@@ -105,4 +106,7 @@ void render_end_screen(int is_victory, int kills, int items, int damage_dealt, i
 // Render a message popup
 void render_message(const char *message);
 
+// Render seed display at top right of screen
+void render_seed_display(unsigned int seed);
+
 #endif  // RENDER_H