{% extends 'login-layout.html' %}
{% from "security/_macros.html" import prop_next %}

{% block content %}
<v-main class="d-flex flex-column align-center justify-center" style="min-height: 100vh; background: rgb(var(--v-theme-background));">
    <v-card class="mx-auto pa-8 w-100" rounded="lg" style="max-width: 424px;">
        <div class="text-center mb-6">
            <div class="mb-4">{% include "_brand.html" %}</div>
            <div class="text-headline-small font-weight-bold">Verify Your Identity</div>
            <div class="text-body-medium text-medium-emphasis">Re-authenticate using your security key</div>
        </div>

        {% include "security/_messages.html" %}

        {% if not credential_options %}
        <form action="{{ url_for_security('wan_verify') }}{{ prop_next() }}" method="post">
            {{ wan_verify_form.hidden_tag() }}
            <v-btn color="primary" type="submit" size="large" block>
                <template v-slot:prepend>
                    <i class="ti ti-fingerprint" style="font-size: 20px;"></i>
                </template>
                Verify with Security Key
            </v-btn>
        </form>
        {% else %}
        <div class="text-center pa-6">
            <v-progress-circular indeterminate color="primary" size="48" class="mb-4"></v-progress-circular>
            <div class="text-body-large">Waiting for your security key...</div>
            <div class="text-body-small text-medium-emphasis">Follow the prompts on your device</div>
        </div>

        <form action="{{ url_for_security('wan_verify_response') }}{{ prop_next() }}" method="post" id="wan-verify-response-form">
            {{ wan_verify_response_form.hidden_tag() }}
            <input type="hidden" id="credential" name="credential" value="">
        </form>

        <div id="wan-errors"></div>
        {% endif %}
    </v-card>

    <div class="mt-6 w-100" style="max-width: 424px;">
        <v-btn onclick="history.back()" variant="text" color="primary">
            <i class="ti ti-chevron-left mr-1"></i>
            Back
        </v-btn>
    </div>
</v-main>
{% endblock %}

{% block js %}
<script>
    const { createApp } = Vue;
    const { createVuetify } = Vuetify;
    const vuetify = createVuetify(vuetifyConfig);

    const app = createApp({ delimiters: delimiters });
    app.use(vuetify).mount('#app');

    {% if credential_options %}
    (function() {
        function b64urlToArrayBuffer(base64url) {
            const padding = '='.repeat((4 - (base64url.length % 4)) % 4);
            const base64 = (base64url + padding).replace(/-/g, '+').replace(/_/g, '/');
            const raw = atob(base64);
            const bytes = new Uint8Array(raw.length);
            for (let i = 0; i < raw.length; i++) bytes[i] = raw.charCodeAt(i);
            return bytes.buffer;
        }

        function arrayBufferToB64url(buffer) {
            const bytes = new Uint8Array(buffer);
            let binary = '';
            for (let i = 0; i < bytes.byteLength; i++) binary += String.fromCharCode(bytes[i]);
            return btoa(binary).replace(/\+/g, '-').replace(/\//g, '_').replace(/=+$/g, '');
        }

        const options = {{ credential_options | tojson }};
        options.challenge = b64urlToArrayBuffer(options.challenge);
        if (Array.isArray(options.allowCredentials)) {
            options.allowCredentials = options.allowCredentials.map(c => ({...c, id: b64urlToArrayBuffer(c.id)}));
        }

        navigator.credentials.get({ publicKey: options })
            .then(credential => {
                if (!credential) throw new Error('No credential returned');
                const encoded = {
                    id: credential.id,
                    rawId: arrayBufferToB64url(credential.rawId),
                    type: credential.type,
                    response: {
                        clientDataJSON: arrayBufferToB64url(credential.response.clientDataJSON),
                        authenticatorData: arrayBufferToB64url(credential.response.authenticatorData),
                        signature: arrayBufferToB64url(credential.response.signature),
                        userHandle: credential.response.userHandle
                            ? arrayBufferToB64url(credential.response.userHandle) : null,
                    },
                };
                document.getElementById('credential').value = JSON.stringify(encoded);
                document.getElementById('wan-verify-response-form').submit();
            })
            .catch(error => {
                document.getElementById('wan-errors').innerHTML =
                    '<div class="v-alert v-alert--density-default v-alert--variant-tonal bg-error pa-4 rounded mb-4">' +
                    (error.message || 'Passkey verification failed.') + '</div>';
            });
    })();
    {% endif %}
</script>
{% endblock %}