'use client'

import { useState } from 'react'
import { useRouter } from '../contexts/RouterContext'
import { useConfig } from '../contexts/AuthContext'
import { useAllauthAPI } from '../contexts/APIContext'
import { useAuthContext } from '../contexts/AuthContext'
import { useStyles } from '../contexts/StylesContext'

interface PasskeyLoginProps {
    onSuccess?: () => void
}

export function PasskeyLogin({ onSuccess }: PasskeyLoginProps) {
    const router = useRouter()
    const config = useConfig()
    const api = useAllauthAPI()
    const { refresh } = useAuthContext()
    const styles = useStyles()
    const [error, setError] = useState<string | null>(null)
    const [authenticating, setAuthenticating] = useState(false)

    // Check if passkey login is enabled
    const passkeyLoginEnabled = config?.data?.mfa?.passkey_login_enabled

    if (!passkeyLoginEnabled) {
        return null
    }

    const handlePasskeyLogin = async () => {
        setError(null)
        setAuthenticating(true)

        try {
            const { startAuthentication } = await import('@simplewebauthn/browser')

            // Get login options (challenge) from server
            const optionsRes = await api.webauthn.requestOptions.login()

            if (optionsRes.status !== 200) {
                throw new Error('Failed to get login options')
            }

            // Extract publicKey options - allauth returns { request_options: { publicKey: {...} } }
            const publicKeyOptions = optionsRes.data?.request_options?.publicKey

            if (!publicKeyOptions?.challenge) {
                throw new Error('Invalid login options')
            }

            // Perform WebAuthn authentication in browser
            // @simplewebauthn/browser v13+ expects { optionsJSON: ... }
            const credential = await startAuthentication({ optionsJSON: publicKeyOptions as any })

            // Submit credential to server for login
            const res = await api.webauthn.login(credential)

            if (res.status === 200) {
                await refresh()
                if (onSuccess) {
                    onSuccess()
                } else {
                    const next = router.searchParams.get('next')
                    router.push(next?.startsWith('/') ? next : '/dashboard')
                }
            } else {
                setError('Login failed. Please try again.')
            }
        } catch (e: any) {
            if (e.name === 'AbortError' || e.name === 'NotAllowedError') {
                // User cancelled - not an error
                setError(null)
            } else {
                setError(e.message || 'Failed to sign in with passkey')
            }
        } finally {
            setAuthenticating(false)
        }
    }

    return (
        <div className={styles.passkeyContainer}>
            <div className={styles.divider}>
                <span className={styles.dividerText}>or</span>
            </div>

            {error && (
                <div className={styles.error}>
                    <p>{error}</p>
                </div>
            )}

            <button
                type="button"
                onClick={handlePasskeyLogin}
                disabled={authenticating}
                className={styles.passkeyButton}
            >
                {authenticating ? 'Waiting for passkey...' : 'Sign in with Passkey'}
            </button>
        </div>
    )
}