Initial commit

main/tarot_logic.c

@@ -0,0 +1,71 @@
+#include "tarot_logic.h"
+
+#include <string.h>
+
+#include "esp_random.h"
+
+static const char *const s_spread_3[] = {
+    "Past",
+    "Present",
+    "Future",
+};
+
+static const char *const s_spread_8[] = {
+    "Current energy",
+    "Challenge",
+    "Hidden influence",
+    "Past root",
+    "Near future",
+    "Advice",
+    "External energy",
+    "Outcome",
+};
+
+const char *tarot_spread_name(tarot_spread_t spread)
+{
+    switch (spread) {
+    case TAROT_SPREAD_3_CARD:
+        return "3-card";
+    case TAROT_SPREAD_8_CARD:
+        return "8-card";
+    default:
+        return "Unknown";
+    }
+}
+
+const char *tarot_spread_position_meaning(tarot_spread_t spread, size_t index)
+{
+    if (spread == TAROT_SPREAD_3_CARD && index < 3) {
+        return s_spread_3[index];
+    }
+    if (spread == TAROT_SPREAD_8_CARD && index < 8) {
+        return s_spread_8[index];
+    }
+    return "";
+}
+
+void tarot_logic_draw_reading(tarot_reading_t *reading, tarot_spread_t spread, bool reversed_enabled)
+{
+    bool used[TAROT_DECK_SIZE] = { false };
+    size_t count = spread == TAROT_SPREAD_3_CARD ? 3 : 8;
+
+    if (reading == NULL) {
+        return;
+    }
+
+    memset(reading, 0, sizeof(*reading));
+    reading->spread = spread;
+    reading->count = count;
+
+    for (size_t i = 0; i < count; i++) {
+        uint8_t card_id = 0;
+        do {
+            card_id = esp_random() % TAROT_DECK_SIZE;
+        } while (used[card_id]);
+
+        used[card_id] = true;
+        reading->cards[i].card = &tarot_deck[card_id];
+        reading->cards[i].reversed = reversed_enabled ? ((esp_random() & 1U) == 1U) : false;
+        reading->cards[i].position_meaning = tarot_spread_position_meaning(spread, i);
+    }
+}