/**
 * WebAuthn credentials management page.
 *
 * Lists registered passkeys with name, transports, and sign count.
 * Provides "Add passkey" and "Remove" actions.
 */

import {
    html,
    definePage,
    reactive,
    apiFetch,
    toast,
    openModal,
    closeModal,
    formModal,
    refreshModals,
    PageHeader,
    Empty,
    Table,
    esc,
    ActionCell,
    Badge,
    startRegistration,
    webauthnSupported,
    isModalProcessing,
    setModalProcessing,
} from '/static/hoover/index.js';

const state = reactive({ credentials: [], loading: true, refreshing: false, error: null });

async function loadCredentials(abortController) {
    if (abortController?.signal?.aborted) return;
    if (state.credentials.length) state.refreshing = true;
    else state.loading = true;
    state.error = null;

    try {
        const res = await apiFetch('/api/auth/webauthn/credentials', {
            signal: abortController?.signal,
        });
        if (abortController?.signal?.aborted) return;
        if (res.ok) {
            state.credentials = res.data || [];
        } else {
            state.error = res.error || 'Failed to load credentials';
        }
    } catch (e) {
        if (!abortController?.signal?.aborted) {
            state.error = e.message || 'Failed to load credentials';
        }
    } finally {
        if (!abortController?.signal?.aborted) {
            state.loading = false;
            state.refreshing = false;
        }
    }
}

function addCredentialModal() {
    if (!webauthnSupported()) {
        toast('WebAuthn is not supported in this browser', 'error');
        return;
    }

    openModal((inner) => {
        formModal(
            inner,
            'Add passkey',
            [
                {
                    label: 'Passkey name',
                    id: 'cred-name',
                    type: 'text',
                    placeholder: 'My laptop key',
                },
            ],
            [
                {
                    label: 'Cancel',
                    cls: 'btn-outline',
                    action: 'c',
                    handler: () => closeModal(),
                },
                {
                    label: 'Register',
                    cls: 'btn-primary',
                    action: 'r',
                    processing: true,
                    handler: async () => {
                        if (isModalProcessing()) return;
                        setModalProcessing(true);
                        refreshModals();

                        const user = JSON.parse(sessionStorage.getItem('vw:user') || 'null');
                        const username = user?.username || '';
                        if (!username) {
                            toast('Username not available', 'error');
                            setModalProcessing(false);
                            refreshModals();
                            return;
                        }

                        try {
                            // Step 1: Get registration options
                            const beginRes = await apiFetch('/api/auth/webauthn/register-begin', {
                                method: 'POST',
                                body: { username },
                            });

                            if (!beginRes.ok) {
                                throw beginRes.error || 'Registration failed';
                            }

                            const options = beginRes.data;

                            // Step 2: Call browser authenticator
                            const credentialName = document.getElementById('cred-name')?.value?.trim() || '';
                            const credentialResponse = await startRegistration(options);

                            // Step 3: Verify with server
                            const finishRes = await apiFetch('/api/auth/webauthn/register-finish', {
                                method: 'POST',
                                body: {
                                    username,
                                    credential_response: credentialResponse,
                                    registration_options: options,
                                    name: credentialName,
                                },
                            });

                            if (!finishRes.ok) {
                                throw finishRes.error || 'Registration verification failed';
                            }

                            toast('Passkey registered', 'success');
                            closeModal();
                            loadCredentials();
                        } catch (e) {
                            if (!e.message.toLowerCase().includes('cancelled')) {
                                toast(e.message || 'Registration failed', 'error');
                            }
                        } finally {
                            setModalProcessing(false);
                            refreshModals();
                        }
                    },
                },
            ],
        );
    });
}

function confirmRemove(credentialId, credentialName) {
    openModal((inner) => {
        formModal(
            inner,
            'Remove passkey',
            [],
            [
                html`<p class="text-sm">Remove "<strong>${esc(credentialName || credentialId.slice(0, 12))}</strong>"?</p>`,
                {
                    label: 'Cancel',
                    cls: 'btn-outline',
                    action: 'c',
                    handler: () => closeModal(),
                },
                {
                    label: 'Remove',
                    cls: 'btn-primary btn-danger',
                    action: 'r',
                    processing: true,
                    handler: async () => {
                        if (isModalProcessing()) return;
                        setModalProcessing(true);
                        refreshModals();

                        try {
                            const res = await apiFetch('/api/auth/webauthn/creds/' + encodeURIComponent(credentialId), {
                                method: 'DELETE',
                            });

                            if (!res.ok) {
                                throw res.error || 'Removal failed';
                            }

                            toast('Passkey removed', 'success');
                            closeModal();
                            loadCredentials();
                        } catch (e) {
                            toast(e.message || 'Removal failed', 'error');
                        } finally {
                            setModalProcessing(false);
                            refreshModals();
                        }
                    },
                },
            ],
        );
    });
}

function CredentialsPage() {
    if (state.loading && !state.credentials.length) {
        return [
            PageHeader({ title: 'Passkeys', subtitle: 'Manage your passkey credentials for passwordless authentication' }),
            html`<div class="card" key="loading">
                <div class="card-body loading">Loading...</div>
            </div>`,
        ];
    }

    if (state.error) {
        return [
            PageHeader({ title: 'Passkeys', subtitle: 'Manage your passkey credentials for passwordless authentication' }),
            html`<div class="card" key="error">
                <div class="card-body error-msg">${esc(state.error)}</div>
            </div>`,
        ];
    }

    if (!state.credentials.length) {
        return [
            PageHeader({
                title: 'Passkeys',
                subtitle: 'Manage your passkey credentials for passwordless authentication',
                actions: html`<button class="btn btn-sm btn-primary" onClick=${() => webauthnSupported() && addCredentialModal()}>
                    Add passkey
                </button>`,
            }),
            html`<Empty text="No passkeys registered">
                <button class="btn btn-sm btn-primary"
                    onClick=${() => webauthnSupported() && addCredentialModal()}>
                    Add passkey
                </button>
            </Empty>`,
        ];
    }

    const cols = [
        { key: 'name', label: 'Name' },
        { key: 'transports', label: 'Transports' },
        { key: 'signCount', label: 'Uses' },
        { key: 'id', label: 'ID' },
        { key: '_action', label: '' },
    ];

    const rows = state.credentials.map(c => ({
        name: esc(c.name || 'Unnamed'),
        transports: (c.transports || ['internal']).map(t =>
            html`<Badge>${esc(t)}</Badge>`
        ),
        signCount: c.sign_count ?? 0,
        id: esc(c.id.slice(0, 12) + '...'),
        _action: ActionCell({
            actions: [
                {
                    label: 'Remove',
                    cls: 'btn-danger',
                    icon: 'Delete',
                    onClick: () => confirmRemove(c.id, c.name),
                },
            ],
        }),
    }));

    const actions = webauthnSupported()
        ? html`<button class="btn btn-sm btn-primary" onClick=${() => addCredentialModal()}>
            Add passkey
        </button>`
        : html`<span class="text-sm text-muted">WebAuthn not supported in this browser</span>`;

    return [
        PageHeader({
            title: 'Passkeys',
            subtitle: 'Manage your passkey credentials for passwordless authentication',
            actions: actions,
        }),
        Table({ columns: cols, rows }),
    ];
}

const Page = definePage({
    init() {
        document.title = 'Passkeys — Vacuum Wall';
        return state;
    },

    async load(s, abortController) {
        await loadCredentials(abortController);
    },

    render() {
        return CredentialsPage();
    },
});

export default Page;