feat: add digits input, complete signin form

src/components/components/DigitsInput.tsx

@@ -0,0 +1,106 @@
+import React, {
+  useRef,
+  useEffect,
+  type SetStateAction,
+  type Dispatch,
+  useState,
+  type KeyboardEvent,
+} from 'react';
+import { TextField, Stack } from '@mui/material';
+
+interface DigitInputProps {
+  onChange: Dispatch<SetStateAction<string[]>>;
+}
+
+const DigitInput: React.FC<DigitInputProps> = ({ onChange }) => {
+  const [code, setCode] = useState<string[]>(['', '', '', '']);
+  const inputRefs = useRef<Array<HTMLInputElement | null>>([]);
+
+  useEffect(() => {
+    inputRefs.current[0]?.focus();
+  }, []);
+
+  const handleChange = (value: string, index: number) => {
+    if (!/^\d$/.test(value) && value !== '') return;
+
+    const newCode = [...code];
+    newCode[index] = value;
+    setCode(newCode);
+    onChange(newCode);
+
+    if (value && index < 4 - 1) {
+      inputRefs.current[index + 1]?.focus();
+    }
+  };
+
+  const handleBackspace = (
+    event: KeyboardEvent<HTMLDivElement>,
+    index: number,
+  ) => {
+    event.preventDefault();
+    if (index >= 0) {
+      handleChange('', index);
+      inputRefs.current[index - 1]?.focus();
+    }
+  };
+
+  const handlePaste = (event: React.ClipboardEvent) => {
+    event.preventDefault();
+    const pastedData = event.clipboardData.getData('text').replace(/\D/g, ''); // Remove non-digit characters
+    const newCode = [...code];
+
+    pastedData.split('').forEach((digit, i) => {
+      if (i < code.length) {
+        newCode[i] = digit;
+      }
+    });
+
+    setCode(newCode);
+    onChange(newCode);
+
+    // Focus the next empty input after the last pasted character
+    const lastIndex = Math.min(pastedData.length, code.length) - 1;
+    if (lastIndex >= 0 && inputRefs.current[lastIndex]) {
+      inputRefs.current[lastIndex]?.focus();
+    }
+  };
+
+  return (
+    <Stack
+      direction="row-reverse"
+      alignItems="center"
+      sx={{ gap: 2, width: '100%', my: 4 }}
+      justifyContent="center"
+    >
+      {code.map((digit, index) => (
+        <TextField
+          key={index}
+          inputRef={(el) => (inputRefs.current[index] = el)}
+          value={digit}
+          onChange={(e) => handleChange(e.target.value, index)}
+          onKeyDown={(e) => e.key === 'Backspace' && handleBackspace(e, index)}
+          onPaste={(e) => handlePaste(e)}
+          slotProps={{
+            htmlInput: {
+              maxLength: 1,
+              sx: {
+                height: '72px',
+              },
+              style: {
+                textAlign: 'center',
+                fontSize: '48px',
+              },
+            },
+          }}
+          variant="standard"
+          size="medium"
+          sx={{
+            width: '83px',
+          }}
+        />
+      ))}
+    </Stack>
+  );
+};
+
+export default DigitInput;