some change

src/app/auth/pages/SignupPage.tsx

@@ -0,0 +1,214 @@
+import { useNavigate, useParams } from 'react-router-dom'
+import { useEffect, useRef, useState, FormEvent, useCallback, Ref } from 'react'
+import SingleColumnLayout from '../../../layouts/SingleColumnLayout.tsx'
+import TextInput from '../../../components/TextInput.tsx'
+import PrimaryButton from '../../../components/PrimaryButton.tsx'
+import PrimaryLinkButton from '../../../components/PrimaryLinkButton.tsx'
+import { invalid, valid, Validation } from '../../../utils/validation.ts'
+import { AuthService } from '../authService.ts'
+import SecondaryNavButton from '../../../components/SecondaryNavButton.tsx'
+
+const SignupCodeKey = 'signupCode'
+
+interface SignupPageProps {
+  authService: AuthService
+}
+
+export default function SignupPage({ authService }: SignupPageProps) {
+  const { code } = useParams()
+  const [signupCode, setSignupCode] = useState<string | null>(null)
+  const [isSubmitting, setIsSubmitting] = useState(false)
+
+  const [username, setUsername, usernameError, validateUsername] =
+    useValidatedInput(isValidUsername)
+
+  const [password, setPassword, passwordError, validatePassword] =
+    useValidatedInput(isValidPassword)
+
+  const userNameInputRef = useRef<HTMLInputElement | null>(null)
+  const passwordInputRef = useRef<HTMLInputElement | null>(null)
+
+  const dialogRef = useRef<HTMLDialogElement | null>(null)
+
+  const navigate = useNavigate()
+
+  useEffect(() => {
+    if (signupCode) return
+
+    let theSignupCode: string | null
+    if (code) {
+      theSignupCode = code
+      setSignupCode(theSignupCode)
+      localStorage.setItem(SignupCodeKey, theSignupCode)
+    } else {
+      theSignupCode = localStorage.getItem(SignupCodeKey)
+    }
+
+    if (!theSignupCode) {
+      dialogRef.current?.showModal()
+    }
+  }, [code, signupCode])
+
+  const onSubmit = async (e: FormEvent<HTMLFormElement>) => {
+    e.preventDefault()
+
+    if (!signupCode) {
+      throw new Error("there's no code")
+    }
+
+    const isUsernameValid = validateUsername()
+    const isPasswordValid = validatePassword()
+
+    if (!isPasswordValid) {
+      passwordInputRef.current?.focus()
+    }
+
+    if (!isUsernameValid) {
+      userNameInputRef.current?.focus()
+    }
+
+    if (!isUsernameValid || !isPasswordValid) {
+      return
+    }
+
+    setIsSubmitting(true)
+
+    try {
+      await authService.signup(username, password, signupCode)
+      navigate('/')
+    } finally {
+      setIsSubmitting(false)
+    }
+  }
+
+  return (
+    <SingleColumnLayout>
+      <main className="w-full mx-auto p-4">
+        <div className="mt-12">
+          <form className="flex flex-col gap-4 max-w-md" onSubmit={onSubmit}>
+            <FormInput
+              id="username"
+              value={username}
+              onInput={setUsername}
+              error={usernameError}
+              ref={userNameInputRef}
+            />
+
+            <FormInput
+              id="password"
+              value={password}
+              onInput={setPassword}
+              error={passwordError}
+              type="password"
+              ref={passwordInputRef}
+            />
+            <PrimaryButton
+              className="mt-4"
+              disabled={isSubmitting || !!usernameError || !!passwordError}
+              type="submit"
+            >
+              {isSubmitting ? 'wait...' : 'give me an account pls'}
+            </PrimaryButton>
+            <SecondaryNavButton to={'/login'}>login instead?</SecondaryNavButton>
+          </form>
+        </div>
+      </main>
+
+      <dialog
+        id="go-away-dialog"
+        ref={dialogRef}
+        className="p-6 rounded-lg shadow-lg m-auto outline-none"
+      >
+        <div className="text-gray-600 flex flex-col gap-2">
+          <h1 className={`font-bold text-lg`}>STOP !!!</h1>
+          <p>You need an invitation to sign up</p>
+          <p>
+            I'm surprised you even found your way here without one and honestly I'd prefer it if you
+            would leave
+          </p>
+          <p>
+            If you <span className="italic">do</span> want to create an account, you should know who
+            to contact
+          </p>
+          <PrimaryLinkButton className={`mt-4`} href="https://en.wikipedia.org/wiki/Special:Random">
+            I'm sorry I'll go somewhere else :(
+          </PrimaryLinkButton>
+        </div>
+      </dialog>
+    </SingleColumnLayout>
+  )
+}
+
+interface FormInputProps {
+  id: string
+  value: string
+  onInput: (value: string) => void
+  error: string | null
+  type?: 'text' | 'password'
+  ref: Ref<HTMLInputElement>
+}
+
+function FormInput({ id, value, onInput, error, type = 'text', ref }: FormInputProps) {
+  return (
+    <div className="flex flex-col gap-1">
+      <label htmlFor={id} className="text-sm text-gray-600">
+        {id}
+      </label>
+      <TextInput ref={ref} type={type} id={id} value={value} onInput={onInput} />
+      <span className="text-xs h-3 text-red-500">{error}</span>
+    </div>
+  )
+}
+
+type UseValidateInputReturn = [string, (value: string) => void, string | null, () => boolean]
+
+function useValidatedInput(validator: (value: string) => Validation): UseValidateInputReturn {
+  const [value, setValue] = useState<string>('')
+  const [error, setError] = useState<string | null>(null)
+  const [keepValidating, setKeepValidating] = useState(false)
+
+  const validate = useCallback(() => {
+    const { isValid, error } = validator(value)
+    if (isValid) {
+      setError(null)
+    } else {
+      // We only want to validate on input after they have invalidly submitted once.
+      // It's annoying if we set error messages before they've even finished typing.
+      setKeepValidating(true)
+      setError(error)
+    }
+
+    return isValid
+  }, [validator, value])
+
+  useEffect(() => {
+    if (keepValidating) {
+      validate()
+    }
+  }, [keepValidating, validate])
+
+  return [value, setValue, error, validate]
+}
+
+function isValidUsername(username: string): Validation {
+  if (!username) return invalid('you need to enter a username :/')
+
+  if (username.length < 3) {
+    return invalid('not long enough :(')
+  }
+
+  const usernameRegex = /^[a-zA-Z0-9_-]+$/
+  if (usernameRegex.test(username)) {
+    return valid()
+  } else {
+    return invalid("that's not a good username :'(")
+  }
+}
+
+function isValidPassword(password: string): Validation {
+  if (password.length >= 6) {
+    return valid()
+  } else {
+    return invalid("that isn't a good password :/")
+  }
+}