'use client'

import styles from '@/app/styles/module/login.module.scss';
import { ChangeEvent, useActionState, useEffect, useRef, useState } from 'react';
import { registration, FormState } from '@/app/actions/auth';


import PhoneInput from '@/app/ui/inputs/phone-input';
import Link from 'next/link';
import { useTranslations } from 'next-intl';
import { IconEye } from '@/app/ui/icons/icons';
import { getSignupFormSchema } from '@/app/actions/definitions';
import { useSearchParams } from 'next/navigation';
import * as z from 'zod'
import ConfirmMailModalWindow from '@/app/ui/forms/confirm-mail-modal-window';
import { fetchINN } from '@/app/actions/action';
import { useDebouncedCallback } from 'use-debounce';


export default function RegisterForm() {
	const searchParams = useSearchParams();
	const referralCode = searchParams.get('ref');

	const [state, formAction, isPending] = useActionState(
		registration,
		undefined,
	);

	const t = useTranslations('Login-register-form');
	const [showPassword, setShowPassword] = useState(false);
	const [showConfirmPassword, setShowConfirmPassword] = useState(false);
	const [formState, setFormState] = useState<FormState | undefined>(undefined);
	const [showMailConfirmWindow, setShowMailConfirmWindow] = useState(false);
	const passwordRef = useRef<HTMLInputElement>(null);
	const [accountType, setAccountType] = useState<'b2c' | 'b2b'>('b2c');

	useEffect(() => {
		setFormState(state);
		if (state?.mailConfirm) {
			setShowMailConfirmWindow(true);
		}

	}, [state]);

	const debouncedFetchINN = useDebouncedCallback(
		async (value) => {
			const response = await fetchINN(value);

			if (response.companyName) {
				setFormState({
					...formState,
					previousState: {
						...formState?.previousState,
						companyName: response.companyName
					},
					error: {
						...formState?.error,
						companyName: ''
					}
				});
			} else {
				setFormState({
					...formState,
					previousState: {
						companyName: response.companyName
					},
					error: {
						...formState?.error,
						companyName: '',
						inn: 'inn-invalid'
					}
				});
			}
		},
		500
	);

	function showPassowrd(target: 'password' | 'confirm-password') {
		if (target === 'password') {
			setShowPassword(!showPassword);
		} else {
			setShowConfirmPassword(!showConfirmPassword);
		}
	}

	type SignupFormSchema = Awaited<ReturnType<typeof getSignupFormSchema>>;
	const [signupFormSchema, setSignupFormSchema] = useState<SignupFormSchema | null>(null);

	useEffect(() => {
		let isMounted = true;

		const loadSchema = async () => {
			const result = await getSignupFormSchema(accountType);
			if (isMounted) {
				setSignupFormSchema(result);
			}
		};

		loadSchema();

		return () => {
			isMounted = false;
		};
	}, [accountType]);

	async function validateField(
		fieldName: string,
		value: string,
	) {
		switch (fieldName) {
			case 'confirm_password':
				const baseSchema = signupFormSchema?.shape.confirm_password;

				if (!baseSchema) {
					return { success: true, data: value };
				}

				const baseResult = baseSchema.safeParse(value);

				if (!baseResult.success) {
					return baseResult;
				}

				const currentPassword = passwordRef.current?.value || '';
				if (value !== currentPassword) {
					return {
						success: false,
						error: new z.ZodError([
							{
								code: z.ZodIssueCode.custom,
								message: 'repeat-password',
								path: ['confirm_password']
							}
						])
					};
				}

				return { success: true, data: value };

			case 'email':
			case 'fullName':
			case 'phone':
			case 'referralCode':
			case 'password':
			case 'companyName':
			case 'agree':
			case 'inn':
				const schema = signupFormSchema?.shape[fieldName];
				if (!schema) {
					return { success: true, data: value };
				}

				if (fieldName === 'phone') {
					return schema.safeParse(value.replace(/[-\(\)\s]/g, ''));
				}
				if (fieldName === 'companyName' && accountType === 'b2c') {
					return { success: true, data: value };
				}
				if (fieldName === 'referralCode') {
					return { success: true, data: value };
				}
				return schema.safeParse(value);

			default:
				throw new Error(`Unknown field: ${fieldName}`);
		}
	}

	async function onChangeHandler(e: ChangeEvent<HTMLInputElement>): Promise<void> {
		const fieldName = e.target.name;
		if (fieldName !== 'phone') {
			e.target.value = e.target.value
				.replace(/([^a-zA-Zа-яёА-ЯЁ0-9@.!#$%&"'*+/=?^_{|}~\-\s])/g, '')
				.replace(/\s+/g, ' ');
		}

		if (fieldName === 'inn') {
			const currentValue = e.target.value;

			const cleanedValue = currentValue.replace(/([^0-9])/g, '');

			if (cleanedValue.length > 10) {
				e.target.value = cleanedValue.slice(0, 10);
				debouncedFetchINN(e.target.value);
			} else {
				e.target.value = cleanedValue;
			}

			if (cleanedValue.length === 10) {
				debouncedFetchINN(cleanedValue);
			} else {
				if (formState) {
					setFormState({
						...formState,
						previousState: {
							...formState?.previousState,
							companyName: ''
						},
						error: {
							...formState?.error,
							companyName: '',
							inn: ''
						}
					});
				}
			}
		}

		const validatedField = await validateField(fieldName, e.target.value);

		if (validatedField.success) {
			setFormState(prevState => {
				if (!prevState?.error || !prevState?.error[fieldName]) {
					return prevState;
				}

				const { [fieldName]: _, ...newError } = prevState.error;

				return {
					...prevState,
					error: newError
				};
			});
		}
	}

	function switchRegistrationTypeHandler(e: React.MouseEvent<HTMLButtonElement>, type: 'b2c' | 'b2b') {
		e.preventDefault();
		setAccountType(type);
		if (formState?.previousState) {
			setFormState({
				...formState,
				previousState: {
					...formState.previousState,
					companyName: '',
					inn: ''
				},
				error: {
					...formState.error,
					companyName: '',
					inn: ''
				}
			});
		}
	}

	return (
		<>
			{showMailConfirmWindow && (
				<div
					className="modal-wrapper"
					onClick={() => {
						setShowMailConfirmWindow(false);
					}}
				>
					<ConfirmMailModalWindow userId={state?.userId} email={formState?.previousState?.email} onClose={() => { setShowMailConfirmWindow(false) }} />
				</div>
			)}
			<form
				action={(e) => {
					formAction(e);
				}}
				autoComplete="off"
			>
				<div className={`${styles['form-switcher']}`}>
					<button
						className={`${styles['form-switcher-button']} ${accountType === 'b2c' ? styles['active'] : ''}`}
						onClick={(e) => {
							switchRegistrationTypeHandler(e, 'b2c');
						}}
					>
						{t('personal')}
					</button>
					<button
						className={`${styles['form-switcher-button']} ${accountType === 'b2b' ? styles['active'] : ''}`}
						onClick={(e) => {
							switchRegistrationTypeHandler(e, 'b2b');
						}}
					>
						{t('company')}
					</button>
					<input
						type="hidden"
						id="accountType"
						name="accountType"
						className={`${styles['form-input-hidden']}`}
						value={accountType}
					/>
				</div>

				<div className={`${styles['form-group']}`}>
					<label
						className={`${styles['form-label']} ${styles['required']}`}
					>
						{t('full-name')}
					</label>
					<input
						type="text"
						id="fullName"
						name="fullName"
						className={`${styles['form-input']}`}
						placeholder={t('name-placeholder')}
						defaultValue={formState?.previousState?.fullName ? formState?.previousState?.fullName : ''}
						onChange={onChangeHandler}
					/>
					{formState?.error?.fullName && (
						<p className="text-sm text-red-500">
							{
								formState?.error?.fullName.split('&').map((e, index) => {
									return (
										<span key={index}>
											{t(e)}
											<br />
										</span>
									)
								})
							}
						</p>
					)}
				</div>

				{accountType === 'b2b' ? (
					<>
						<div className={`${styles['form-group']}`}>
							<label
								className={`${styles['form-label']}  ${styles['required']}`}
							>
								{t('INN')}
							</label>
							<input
								type="text"
								id="inn"
								name="inn"
								className={`${styles['form-input']}`}
								placeholder={t('inn-placeholder')}
								defaultValue={formState?.previousState?.inn ? formState?.previousState?.inn : ''}
								onChange={onChangeHandler}
							/>
							{formState?.error?.inn && (
								<p className="text-sm text-red-500">
									{
										formState?.error?.inn.split('&').map((e, index) => {
											return (
												<span key={index}>
													{t(e)}
													<br />
												</span>
											)
										})
									}
								</p>
							)}
						</div>

						<div className={`${styles['form-group']}`}>
							<label
								className={`${styles['form-label']}`}
							>
								{t('company')}
							</label>
							<input
								type="text"
								id="companyName"
								name="companyName"
								className={`${styles['form-input']}`}
								placeholder={t('field-filled-automatically')}
								value={formState?.previousState?.companyName ?? ''}
								readOnly={true}
								/* defaultValue={formState?.previousState?.companyName ? formState?.previousState?.companyName : ''} */
								onChange={onChangeHandler}
							/>
							{formState?.error?.companyName && (
								<p className="text-sm text-red-500">
									{
										formState?.error?.companyName.split('&').map((e, index) => {
											return (
												<span key={index}>
													{t(e)}
													<br />
												</span>
											)
										})
									}
								</p>
							)}
						</div>
					</>
				) : (
					<div className={`${styles['form-group']}`}>
						<label className={`${styles['form-label']}`}>
							{t('referal-code')}
						</label>
						<input
							type="text"
							id="referralCode"
							name="referralCode"
							className={`${styles['form-input']}`}
							placeholder={t('referal-code')}
							defaultValue={referralCode ? referralCode : formState?.previousState?.referralCode ?? ''}
							onChange={(e) => {
								e.target.value = e.target.value.toLocaleLowerCase();
								onChangeHandler(e)
							}}
						/>
						{formState?.error?.referralCode && (
							<p className="text-sm text-red-500">
								{
									formState?.error?.referralCode.split('&').map((e, index) => {
										return (
											<span key={index}>
												{t(e)}
												<br />
											</span>
										)
									})
								}
							</p>
						)}
					</div>
				)
				}

				<div className={`${styles['form-group']}`}>
					<label className={`${styles['form-label']} ${styles['required']}`}>
						{t('email-adress')}
					</label>
					<input
						type="text"
						id="email"
						name="email"
						className={`${styles['form-input']}`}
						placeholder="ivan@example.com"
						defaultValue={formState?.previousState?.email ? formState?.previousState?.email : ''}
						onChange={(e) => {
							e.target.value = e.target.value.toLocaleLowerCase();
							onChangeHandler(e)
						}}
						autoComplete="off"
					/>
					{formState?.error?.email && (
						<p className="text-sm text-red-500">
							{
								formState?.error?.email.split('&').map((e, index) => {
									return (
										<span key={index}>
											{t(e)}
											<br />
										</span>
									)
								})
							}
						</p>
					)}
				</div>

				<div className={`${styles['form-group']}`}>
					<label className={`${styles['form-label']} ${styles['required']}`}>
						{t('phone')}
					</label>
					<PhoneInput phoneState={formState?.previousState?.phone} validateHandler={onChangeHandler} />
					{formState?.error?.phone && (
						<p className="text-sm text-red-500">
							{
								formState?.error?.phone.split('&').map((e, index) => {
									return (
										<span key={index}>
											{t(e)}
											<br />
										</span>
									)
								})
							}
						</p>
					)}
				</div>

				<div className={`${styles['form-group']}`}>
					<label className={`${styles['form-label']} ${styles['required']}`}>
						{t('password')}
					</label>
					<div
						className={`${styles['password-wrapper']}`}
					>
						<input
							ref={passwordRef}
							type={showPassword ? "text" : "password"}
							id="password"
							name="password"
							className={`${styles['form-input']} ${styles['password']}`}
							placeholder={t('password-placeholder')}
							defaultValue={formState?.previousState?.password ? formState?.previousState?.password : ''}
							onChange={onChangeHandler}
							autoComplete="off"
						/>
						<button
							onClick={() => {
								showPassowrd('password')
							}}
							type="button"
							className={`show-password-button ${showPassword ? 'show' : ''}`}
						>
							<IconEye />
						</button>
					</div>
					{formState?.error?.password && (
						<p className="text-sm text-red-500">
							{
								formState?.error?.password.split('&').map((e, index) => {
									return (
										<span key={index}>
											{t(e)}
											<br />
										</span>
									)
								})
							}
						</p>
					)}
				</div>

				<div className={`${styles['form-group']}`}>
					<label className={`${styles['form-label']} ${styles['required']}`}>
						{t('confirm-password')}
					</label>
					<div className={`${styles['password-wrapper']}`}>
						<input
							type={showConfirmPassword ? "text" : "password"}
							id="confirm_password"
							name="confirm_password"
							className={`${styles['form-input']} ${styles['password']}`}
							placeholder={t('repeat-password')}
							defaultValue={formState?.previousState?.confirm_password ? formState?.previousState?.confirm_password : ''}
							onChange={onChangeHandler}
						/>
						<button
							onClick={() => {
								showPassowrd('confirm-password');
							}}
							type="button"
							className={`show-password-button ${showConfirmPassword ? 'show' : ''}`}
						>
							<IconEye />
						</button>
					</div>
					{formState?.error?.confirm_password && (
						<p className="text-sm text-red-500">
							{t(formState?.error?.confirm_password)}
						</p>
					)}
				</div>

				<div className={`${styles['form-checkbox']}`}>
					<input
						type="checkbox"
						id="agree"
						name="agree"
						defaultChecked={formState?.previousState?.agree ? true : false}
						onChange={onChangeHandler}
					/>
					<label htmlFor="agree">
						{t('i-agree-to')} <Link
							href="/terms-of-use"
							target="_blank"
						>
							{t('terms-of-use')}
						</Link> {t('and')} <Link
							href="/privacy-policy"
							target="_blank"
						>
							{t('privacy-policy')}
						</Link>
					</label>
				</div>
				{formState?.error?.agree && (
					<p className="text-sm text-red-500">
						{t(formState?.error?.agree)}
					</p>
				)}
				{formState?.error?.server && (
					<p className="text-sm text-red-500 mt-4">
						{t(formState?.error?.server)}
					</p>
				)}
				<button
					type="submit"
					className={`${styles['btn']}`}
					disabled={isPending}
				>
					{t("create-an-account")}
					{isPending && (
						<div className="loading-animation">
							<div className="global-spinner"></div>
						</div>
					)}
				</button>
			</form >
		</>
	)
}