Allow player to choose target when playing from deck

game.c

@@ -217,6 +217,23 @@ void handle_input(Game *g) {
       }
     }
     break;
+  case GAME_STATE_CHOOSING_TARGET_FROM_DECK:
+    if (IsMouseButtonPressed(0)) {
+      mouse_pos = GetMousePosition();
+      for (int i = 0; i < g->field.count; i++) {
+	if (point_within_card(g->field.cards[i], mouse_pos)) {
+	  Card *selected_card = g->deck.cards[g->deck.count - 1];
+	  if (valid_play(&g->field, selected_card, g->field.cards[i])) {
+	    g->current_play_from_hand = selected_card;
+	    g->current_play_target = g->field.cards[i];
+	  } else {
+	    printf("Invalid\n");
+	  }
+	  break;
+	}
+      }
+    }
+    break;
   default:
     break;
   }
@@ -381,7 +398,7 @@ void run_frame_choosing_from_hand(Game *g) {
     run_frame_player_choosing_from_hand(g);
   } else {
     run_frame_ai_playing(g);
-    g->state = GAME_STATE_PLAYING_FROM_DECK;
+    g->state = GAME_STATE_SHOWING_CARD_FROM_DECK;
   }
 }
 
@@ -425,29 +442,60 @@ void run_frame_choosing_target(Game *g) {
       add_to_hand(&g->field, g->current_play_from_hand);
       g->current_play_from_hand = NULL;
     }
-    g->state = GAME_STATE_PLAYING_FROM_DECK;
+    g->state = GAME_STATE_SHOWING_CARD_FROM_DECK;
   }
 }
 
+void run_frame_showing_card_from_deck(Game *g) {
+  Card *top_card = g->deck.cards[g->deck.count - 1];
+  remove_from_hand(&g->deck, top_card);
+  add_to_hand(&g->deck, top_card);
+  top_card->visible = true;
+  top_card->move.end_time = 0.3;
+  top_card->move.destination.x = top_card->move.destination.x + 100;
+  g->state = GAME_STATE_PLAYING_FROM_DECK;
+}
+
 void run_frame_playing_from_deck(Game *g) {
   Hand *to_hand = &current_player(g)->scored;
 
   Card *top_card = g->deck.cards[g->deck.count - 1];
-  if (top_card->visible) {
-    Card *target = valid_target(top_card, &g->field);
-    if (target) {
-      capture_card_from_field(g, top_card, target, &g->deck, to_hand);
-    } else {
-      remove_from_hand(&g->deck, top_card);
-      add_to_hand(&g->field, top_card);
-    }
+  Card *targets[4];
+  int target_count = 0;
+  valid_targets(top_card, &g->field, &targets[0], &target_count);
+  Card *target = NULL;
+
+  if (target_count == 1) {
+    capture_card_from_field(g, top_card, targets[0], &g->deck, to_hand);
+    g->state = GAME_STATE_CHECKING_FOR_NEW_DEKIYAKU;
+  } else if(target_count == 0) {
+    remove_from_hand(&g->deck, top_card);
+    add_to_hand(&g->field, top_card);
     g->state = GAME_STATE_CHECKING_FOR_NEW_DEKIYAKU;
   } else {
-    remove_from_hand(&g->deck, top_card);
-    add_to_hand(&g->deck, top_card);
-    top_card->visible = true;
-    top_card->move.end_time = 0.3;
-    top_card->move.destination.x = top_card->move.destination.x + 100;
+    g->state = GAME_STATE_CHOOSING_TARGET_FROM_DECK;
+    return;
+  }
+}
+
+void run_frame_choosing_target_from_deck(Game *g) {
+  Hand *to_hand = &current_player(g)->scored;
+
+  Card *top_card = g->deck.cards[g->deck.count - 1];
+  Card *targets[4];
+  int target_count = 0;
+  valid_targets(top_card, &g->field, &targets[0], &target_count);
+  Card *target = NULL;
+
+  if (is_player_turn(g)) {
+    if (g->current_play_target) {
+      capture_card_from_field(g, top_card, g->current_play_target, &g->deck, to_hand);
+      g->state = GAME_STATE_CHECKING_FOR_NEW_DEKIYAKU;
+    }
+  } else {
+    // TODO: better AI
+    capture_card_from_field(g, top_card, targets[0], &g->deck, to_hand);
+    g->state = GAME_STATE_CHECKING_FOR_NEW_DEKIYAKU;
   }
 }
 
@@ -589,9 +637,15 @@ void run_frame(Game *g) {
   case GAME_STATE_CHOOSING_TARGET:
     run_frame_choosing_target(g);
     break;
+  case GAME_STATE_SHOWING_CARD_FROM_DECK:
+    run_frame_showing_card_from_deck(g);
+    break;
   case GAME_STATE_PLAYING_FROM_DECK:
     run_frame_playing_from_deck(g);
     break;
+  case GAME_STATE_CHOOSING_TARGET_FROM_DECK:
+    run_frame_choosing_target_from_deck(g);
+    break;
   case GAME_STATE_CHECKING_FOR_NEW_DEKIYAKU:
     run_frame_checking_for_new_dekiyaku(g);
     break;

game.h

@@ -22,7 +22,9 @@ typedef enum GameState {
   GAME_STATE_CHECKING_FOR_CANCEL,
   GAME_STATE_CHOOSING_FROM_HAND,
   GAME_STATE_CHOOSING_TARGET,
+  GAME_STATE_SHOWING_CARD_FROM_DECK,
   GAME_STATE_PLAYING_FROM_DECK,
+  GAME_STATE_CHOOSING_TARGET_FROM_DECK,
   GAME_STATE_CHECKING_FOR_NEW_DEKIYAKU,
   GAME_STATE_SELECTING_DEKIYAKU_ACTION,
   GAME_STATE_CALCULATING_SCORES,

play.c

@@ -1,4 +1,5 @@
 #include <stddef.h>
+#include <stdio.h>
 #include <stdbool.h>
 #include "play.h"
 
@@ -25,6 +26,16 @@ bool valid_play(Hand *field, Card *played, Card *target) {
   }
 }
 
+void valid_targets(Card *active, Hand *field, Card **targets, int *target_count) {
+  *target_count = 0;
+  for (int i = 0; i < field->count; i++) {
+    if (field->cards[i]->month == active->month) {
+      targets[(*target_count)++] = field->cards[i];
+    }
+  }
+  targets[*target_count] = NULL; // Sentinel
+}
+
 Card *valid_target(Card *active, Hand *field) {
   for (int i = 0; i < field->count; i++) {
     if (field->cards[i]->month == active->month) {

play.h

@@ -13,6 +13,7 @@ struct Play {
 };
 
 bool valid_play(Hand *field, Card *played, Card *target);
+void valid_targets(Card *active, Hand *field, Card **targets, int *target_count);
 Card *valid_target(Card *active, Hand *field);
 Play ai_play(Hand *hand, Hand *field);