1 files changed, 103 insertions, 0 deletions
diff --git a/src/uci/response.c b/src/uci/response.c
new file mode 100644
index 0000000..b27bf76
--- /dev/null
+++ b/src/uci/response.c
@@ -0,0 +1,103 @@
+#include <string.h>
+#include <assert.h>
+#include "response.h"
+
+enum {
+  STATE_INITIAL,
+  STATE_IDLE,
+  STATE_SYNC,
+  STATE_PING,
+  STATE_ACTIVE,
+  STATE_HALT,
+};
+int current_state = STATE_INITIAL;
+int debug = false;
+
+void todo() {
+  assert(0);
+}
+
+void handle_uci(ucicmd cmd) {
+  if (current_state == STATE_INITIAL) {
+    return handle_initial(cmd);
+  }
+  if (current_state == STATE_IDLE) {
+    return handle_idle(cmd);
+  }
+  if (current_state == STATE_SYNC) {
+    return handle_sync(cmd);
+  }
+  if (current_state == STATE_PING) {
+    return handle_ping(cmd);
+  }
+  if (current_state == STATE_ACTIVE) {
+    return handle_active(cmd);
+  }
+  return handle_halt(cmd);
+}
+
+void handle_initial(ucicmd cmd) {
+  if (cmd.empty || strcmp(cmd.root, "uci") != 0) return;
+  printf("uciok\n");
+  current_state = STATE_IDLE;
+}
+
+void handle_idle(ucicmd cmd) {
+  if (cmd.empty) return;
+  if (strcmp(cmd.root, "debug") == 0) {
+    debug = strcmp(ucicmd_get_arg(cmd, 0), "on") == 0;
+  } else if (strcmp(cmd.root, "setoption") == 0) {
+  } else if (strcmp(cmd.root, "ucinewgame") == 0) {
+  } else if (strcmp(cmd.root, "position") == 0) {
+  } else if (strcmp(cmd.root, "stop") == 0) {
+  } else if (strcmp(cmd.root, "quit") == 0) {
+    free(cmd.args);
+    exit(0);
+  } else if (strcmp(cmd.root, "isready") == 0) {
+    current_state = STATE_SYNC;
+  } else if (strcmp(cmd.root, "go") == 0) {
+    current_state = STATE_ACTIVE;
+  } else {
+    printf("Invalid command: %s\n", cmd.root);
+  }
+}
+
+void handle_sync(ucicmd cmd) {
+  // when i come up with some info to give: 
+  // printf("info\n");
+  printf("readyok\n");
+  current_state = STATE_IDLE;
+}
+
+void handle_ping(ucicmd cmd) {
+  // when i come up with some info to give: 
+  // printf("info\n");
+  //
+  // if (TODO) {
+  //   printf("bestmove\n");
+  //   current_state = STATE_IDLE;
+  // }
+  printf("readyok\n");
+  current_state = STATE_ACTIVE;
+}
+
+void handle_active(ucicmd cmd) {
+  if (cmd.empty) {
+    return;
+  }
+  // TODO: this section will call the engine to analysis
+  if (strcmp(cmd.root, "isready") == 0) {
+    current_state = STATE_PING;
+  } else if (strcmp(cmd.root, "stop") == 0) {
+    current_state = STATE_HALT;
+  } else {
+    printf("Invalid command: %s\n", cmd.root);
+  }
+}
+
+void handle_halt(ucicmd cmd) {
+  // when i come up with some info to give: 
+  // printf("info\n");
+  printf("bestmove 0000\n"); // TODO: idk get it rn
+  current_state = STATE_IDLE;
+}