"use client"

import type { BetterFetchOption } from "@better-fetch/fetch"
import { zodResolver } from "@hookform/resolvers/zod"
import { Loader2 } from "lucide-react"
import { useContext, useEffect } from "react"
import { useForm } from "react-hook-form"
import * as z from "zod"

import { useCaptcha } from "../../../hooks/use-captcha"
import { useIsHydrated } from "../../../hooks/use-hydrated"
import { useOnSuccessTransition } from "../../../hooks/use-success-transition"
import { AuthUIContext } from "../../../lib/auth-ui-provider"
import {
    cn,
    getLocalizedError,
    getPasswordSchema,
    isValidEmail
} from "../../../lib/utils"
import type { AuthLocalization } from "../../../localization/auth-localization"
import type { PasswordValidation } from "../../../types/password-validation"
import { Captcha } from "../../captcha/captcha"
import { PasswordInput } from "../../password-input"
import { Button } from "../../ui/button"
import { Checkbox } from "../../ui/checkbox"
import {
    Form,
    FormControl,
    FormField,
    FormItem,
    FormLabel,
    FormMessage
} from "../../ui/form"
import { Input } from "../../ui/input"
import type { AuthFormClassNames } from "../auth-form"

export interface SignInFormProps {
    className?: string
    classNames?: AuthFormClassNames
    isSubmitting?: boolean
    localization: Partial<AuthLocalization>
    redirectTo?: string
    setIsSubmitting?: (isSubmitting: boolean) => void
    passwordValidation?: PasswordValidation
}

export function SignInForm({
    className,
    classNames,
    isSubmitting,
    localization,
    redirectTo,
    setIsSubmitting,
    passwordValidation
}: SignInFormProps) {
    const isHydrated = useIsHydrated()
    const { captchaRef, getCaptchaHeaders, resetCaptcha } = useCaptcha({
        localization
    })

    const {
        authClient,
        basePath,
        credentials,
        localization: contextLocalization,
        viewPaths,
        navigate,
        toast,
        Link,
        localizeErrors,
        emailVerification
    } = useContext(AuthUIContext)

    const rememberMeEnabled = credentials?.rememberMe
    const usernameEnabled = credentials?.username
    const contextPasswordValidation = credentials?.passwordValidation

    localization = { ...contextLocalization, ...localization }
    passwordValidation = { ...contextPasswordValidation, ...passwordValidation }

    const { onSuccess, isPending: transitionPending } = useOnSuccessTransition({
        redirectTo
    })

    const formSchema = z.object({
        email: usernameEnabled
            ? z.string().min(1, {
                  message: `${localization.USERNAME} ${localization.IS_REQUIRED}`
              })
            : z.string().email({
                  message: `${localization.EMAIL} ${localization.IS_INVALID}`
              }),
        password: getPasswordSchema(passwordValidation, localization),
        rememberMe: z.boolean().optional()
    })

    const form = useForm({
        resolver: zodResolver(formSchema),
        defaultValues: {
            email: "",
            password: "",
            rememberMe: !rememberMeEnabled
        }
    })

    isSubmitting =
        isSubmitting || form.formState.isSubmitting || transitionPending

    useEffect(() => {
        setIsSubmitting?.(form.formState.isSubmitting || transitionPending)
    }, [form.formState.isSubmitting, transitionPending, setIsSubmitting])

    async function signIn({
        email,
        password,
        rememberMe
    }: z.infer<typeof formSchema>) {
        try {
            let response: Record<string, unknown> = {}

            if (usernameEnabled && !isValidEmail(email)) {
                const fetchOptions: BetterFetchOption = {
                    throw: true,
                    headers: await getCaptchaHeaders("/sign-in/username")
                }

                response = await authClient.signIn.username({
                    username: email,
                    password,
                    rememberMe,
                    fetchOptions
                })
            } else {
                const fetchOptions: BetterFetchOption = {
                    throw: true,
                    headers: await getCaptchaHeaders("/sign-in/email")
                }

                response = await authClient.signIn.email({
                    email,
                    password,
                    rememberMe,
                    fetchOptions
                })
            }

            if (response.twoFactorRedirect) {
                navigate(
                    `${basePath}/${viewPaths.TWO_FACTOR}${window.location.search}`
                )
            } else {
                await onSuccess()
            }
        } catch (error) {
            form.resetField("password")
            resetCaptcha()

            toast({
                variant: "error",
                message: getLocalizedError({
                    error,
                    localization,
                    localizeErrors
                })
            })

            if (
                emailVerification?.otp &&
                (error as { error?: { code?: string; message?: string } })
                    ?.error?.code === "EMAIL_NOT_VERIFIED"
            ) {
                navigate(
                    `${basePath}/${
                        viewPaths.EMAIL_VERIFICATION
                    }?email=${encodeURIComponent(email)}`
                )
            }
        }
    }

    return (
        <Form {...form}>
            <form
                onSubmit={form.handleSubmit(signIn)}
                noValidate={isHydrated}
                className={cn("grid w-full gap-6", className, classNames?.base)}
            >
                <FormField
                    control={form.control}
                    name="email"
                    render={({ field }) => (
                        <FormItem>
                            <FormLabel className={classNames?.label}>
                                {usernameEnabled
                                    ? localization.USERNAME
                                    : localization.EMAIL}
                            </FormLabel>

                            <FormControl>
                                <Input
                                    autoComplete={
                                        usernameEnabled ? "username" : "email"
                                    }
                                    className={classNames?.input}
                                    type={usernameEnabled ? "text" : "email"}
                                    placeholder={
                                        usernameEnabled
                                            ? localization.SIGN_IN_USERNAME_PLACEHOLDER
                                            : localization.EMAIL_PLACEHOLDER
                                    }
                                    disabled={isSubmitting}
                                    {...field}
                                />
                            </FormControl>

                            <FormMessage className={classNames?.error} />
                        </FormItem>
                    )}
                />

                <FormField
                    control={form.control}
                    name="password"
                    render={({ field }) => (
                        <FormItem>
                            <div className="flex items-center justify-between">
                                <FormLabel className={classNames?.label}>
                                    {localization.PASSWORD}
                                </FormLabel>

                                {credentials?.forgotPassword && (
                                    <Link
                                        className={cn(
                                            "text-sm hover:underline",
                                            classNames?.forgotPasswordLink
                                        )}
                                        href={`${basePath}/${viewPaths.FORGOT_PASSWORD}${
                                            isHydrated
                                                ? window.location.search
                                                : ""
                                        }`}
                                    >
                                        {localization.FORGOT_PASSWORD_LINK}
                                    </Link>
                                )}
                            </div>

                            <FormControl>
                                <PasswordInput
                                    autoComplete="current-password"
                                    className={classNames?.input}
                                    placeholder={
                                        localization.PASSWORD_PLACEHOLDER
                                    }
                                    disabled={isSubmitting}
                                    {...field}
                                />
                            </FormControl>

                            <FormMessage className={classNames?.error} />
                        </FormItem>
                    )}
                />

                {rememberMeEnabled && (
                    <FormField
                        control={form.control}
                        name="rememberMe"
                        render={({ field }) => (
                            <FormItem className="flex">
                                <FormControl>
                                    <Checkbox
                                        checked={field.value}
                                        onCheckedChange={field.onChange}
                                        disabled={isSubmitting}
                                    />
                                </FormControl>

                                <FormLabel>
                                    {localization.REMEMBER_ME}
                                </FormLabel>
                            </FormItem>
                        )}
                    />
                )}

                <Captcha
                    ref={captchaRef}
                    localization={localization}
                    action="/sign-in/email"
                />

                <Button
                    type="submit"
                    disabled={isSubmitting}
                    className={cn(
                        "w-full",
                        classNames?.button,
                        classNames?.primaryButton
                    )}
                >
                    {isSubmitting ? (
                        <Loader2 className="animate-spin" />
                    ) : (
                        localization.SIGN_IN_ACTION
                    )}
                </Button>
            </form>
        </Form>
    )
}