'use server'

import { auth, getSanitizedHeaders } from '@/lib/auth'
import { prisma } from '@innungsapp/shared'
import { headers } from 'next/headers'
import { revalidatePath } from 'next/cache'
import { redirect } from 'next/navigation'

export async function changePasswordAndDisableMustChange(prevState: any, formData: FormData) {
    const currentPassword = formData.get('currentPassword') as string
    const newPassword = formData.get('newPassword') as string
    const confirmPassword = formData.get('confirmPassword') as string

    if (newPassword !== confirmPassword) {
        return { success: false, error: 'Passwörter stimmen nicht überein.' }
    }

    if (newPassword.length < 8) {
        return { success: false, error: 'Das Passwort muss mindestens 8 Zeichen lang sein.' }
    }

    const sanitizedHeaders = await getSanitizedHeaders()
    const session = await auth.api.getSession({ headers: sanitizedHeaders })
    if (!session?.user) {
        return { success: false, error: 'Nicht authentifiziert.' }
    }

    let redirectUrl: string | null = null

    try {
        // Update password using better-auth
        // This will throw if the current password is invalid or other error occurs
        await auth.api.changePassword({
            headers: sanitizedHeaders,
            body: {
                newPassword,
                currentPassword,
            }
        })

        // Update mustChangePassword flag in database
        await prisma.user.update({
            where: { id: session.user.id },
            data: { mustChangePassword: false }
        })

        const slug = formData.get('slug') as string

        // Sign out so the user has to re-login with the new password
        await auth.api.signOut({ headers: sanitizedHeaders })

        redirectUrl = `/login?message=password_changed&callbackUrl=/${slug}/dashboard`
    } catch (e: any) {
        console.error('Password reset exception:', e)
        // BetterAuth errors often have a message or code
        const errorMessage = e?.message?.toLowerCase() || ''
        if (errorMessage.includes('invalid') && errorMessage.includes('password')) {
            return { success: false, error: 'Das aktuelle Passwort ist nicht korrekt.' }
        }
        return { success: false, error: 'Ein unerwarteter Fehler ist aufgetreten.' }
    }

    if (redirectUrl) {
        redirect(redirectUrl)
    }
}