<script setup lang="ts">
import { ref, computed, onMounted } from "vue";
import { useRouter } from "vue-router";
import { useAuthStore } from "@/stores/auth";
import AppLogo from "@/components/AppLogo.vue";
import { apiErrorMessage } from "@/api/client";

const router = useRouter();
const authStore = useAuthStore();

const username = ref("");
const password = ref("");
const confirmPassword = ref("");
const email = ref("");
const error = ref("");
const submitting = ref(false);
const checking = ref(true);

const passwordMismatch = computed(
  () => confirmPassword.value.length > 0 && password.value !== confirmPassword.value
);

const canSubmit = computed(
  () => !submitting.value && !passwordMismatch.value && password.value.length >= 8
);

onMounted(async () => {
  await authStore.checkHasUsers();
  checking.value = false;
});

async function handleSubmit() {
  if (passwordMismatch.value) {
    error.value = "Passwords do not match";
    return;
  }
  error.value = "";
  submitting.value = true;
  try {
    await authStore.register(username.value, password.value, email.value || undefined);
    router.push("/");
  } catch (e: unknown) {
    error.value = apiErrorMessage(e, "Registration failed");
  } finally {
    submitting.value = false;
  }
}
</script>

<template>
  <main class="auth-page">
    <div class="auth-card">
      <div class="auth-brand"><AppLogo :size="32" /><h1>Create Account</h1></div>

      <div v-if="checking" class="auth-loading">Checking registration status...</div>

      <div v-else-if="!authStore.registrationOpen" class="auth-note">
        <p>Registration is currently closed.</p>
        <p>Contact an administrator to get an account.</p>
        <p class="auth-footer">
          Already have an account?
          <router-link to="/login">Sign in</router-link>
        </p>
      </div>

      <template v-else>
        <form @submit.prevent="handleSubmit">
          <div class="field">
            <label for="username">Username</label>
            <input
              id="username"
              v-model="username"
              type="text"
              autocomplete="username"
              required
              class="input"
            />
          </div>
          <div class="field">
            <label for="email">Email (optional)</label>
            <input
              id="email"
              v-model="email"
              type="email"
              autocomplete="email"
              class="input"
            />
          </div>
          <div class="field">
            <label for="password">Password</label>
            <input
              id="password"
              v-model="password"
              type="password"
              autocomplete="new-password"
              required
              minlength="8"
              class="input"
            />
            <p class="field-hint">Must be at least 8 characters</p>
          </div>
          <div class="field">
            <label for="confirm-password">Confirm Password</label>
            <input
              id="confirm-password"
              v-model="confirmPassword"
              type="password"
              autocomplete="new-password"
              required
              class="input"
              :class="{ 'input-error': passwordMismatch }"
            />
            <p v-if="passwordMismatch" class="error-hint">Passwords do not match</p>
          </div>
          <p v-if="error" class="error-msg">{{ error }}</p>
          <button type="submit" class="btn-primary btn-block" :disabled="!canSubmit">
            {{ submitting ? "Creating account..." : "Create Account" }}
          </button>
        </form>
        <p class="auth-footer">
          Already have an account?
          <router-link to="/login">Sign in</router-link>
        </p>
      </template>
    </div>
  </main>
</template>

<style src="@/assets/auth-shared.css" />
