Smallchess face (#272)

* smallchess face

* use correct game-state modifying board move function

* make show last work after undo

* use SCL_Game->ply instead of board[ply_byte]

* beep when cpu is done computing a move

* increase engine strength to ply 3

* match ply type and use the local variable where available

* fix warnings

* add doc to smallchess face

* smallchess: fix compile warnings

* smallchess: move smallchesslib.h to movement/lib

movement/watch_faces/complication/smallchess_face.h

@@ -0,0 +1,90 @@
+/*
+ * MIT License
+ *
+ * Copyright (c) 2023 Jeremy O'Brien
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in all
+ * copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE.
+ */
+
+#ifndef SMALLCHESS_FACE_H_
+#define SMALLCHESS_FACE_H_
+
+#include "movement.h"
+
+/*
+ * Chess watchface
+ *
+ * Implements a (very) simple chess engine.
+ * Uses smallchesslib for the engine: https://codeberg.org/drummyfish/smallchesslib
+ *
+ * When moving a piece, only valid pieces and moves are presented.
+ *
+ * Interaction is done through a simple menu/submenu system:
+ * - Light button: navigate backwards through the current menu
+ * - Alarm button: navigate forwards through the current menu
+ * - Light button (long press): navigate up to the parent menu
+ * - Alarm button (long press): select the current item or submenu
+ */
+
+enum smallchess_state {
+    /* main menu */
+    SMALLCHESS_MENU_RESUME,
+    SMALLCHESS_MENU_SHOW_LAST_MOVE,
+    SMALLCHESS_MENU_UNDO,
+    SMALLCHESS_MENU_NEW_WHITE,
+    SMALLCHESS_MENU_NEW_BLACK,
+
+    SMALLCHESS_PLAYING_SPLIT,
+
+    /* playing game submenu */
+    SMALLCHESS_SHOW_LAST_MOVE,
+    SMALLCHESS_SHOW_CPU_MOVE,
+    SMALLCHESS_SELECT_PIECE,
+    SMALLCHESS_SELECT_DEST,
+};
+
+#define NUM_ELEMENTS(a) (sizeof(a) / sizeof(a[0]))
+#define SMALLCHESS_NUM_PIECES 16 // number of pieces each player has
+
+typedef struct {
+    void *game;
+    enum smallchess_state state;
+    uint8_t moveable_pieces[SMALLCHESS_NUM_PIECES + 1];
+    uint8_t moveable_pieces_idx;
+    uint8_t moveable_dests[29]; // this magic number represents the maximum number of moves a piece can make (queen in center of board)
+                                // plus one for the end list marker
+    uint8_t moveable_dests_idx;
+    char last_move_str[7];
+    uint8_t ai_from_square, ai_to_square;
+} smallchess_face_state_t;
+
+void smallchess_face_setup(movement_settings_t *settings, uint8_t watch_face_index, void ** context_ptr);
+void smallchess_face_activate(movement_settings_t *settings, void *context);
+bool smallchess_face_loop(movement_event_t event, movement_settings_t *settings, void *context);
+void smallchess_face_resign(movement_settings_t *settings, void *context);
+
+#define smallchess_face ((const watch_face_t){ \
+    smallchess_face_setup, \
+    smallchess_face_activate, \
+    smallchess_face_loop, \
+    smallchess_face_resign, \
+    NULL, \
+})
+
+#endif // SMALLCHESS_FACE_H_