"use client";

import {
	RiCheckLine,
	RiCloseLine,
	RiEyeLine,
	RiEyeOffLine,
} from "@remixicon/react";
import { useMemo, useState, useTransition } from "react";
import { toast } from "sonner";
import { updateEmailAction } from "@/app/(dashboard)/ajustes/actions";
import { Button } from "@/components/ui/button";
import { Input } from "@/components/ui/input";
import { Label } from "@/components/ui/label";

type UpdateEmailFormProps = {
	currentEmail: string;
	authProvider?: string; // 'google' | 'credential' | undefined
};

export function UpdateEmailForm({
	currentEmail,
	authProvider,
}: UpdateEmailFormProps) {
	const [isPending, startTransition] = useTransition();
	const [password, setPassword] = useState("");
	const [newEmail, setNewEmail] = useState("");
	const [confirmEmail, setConfirmEmail] = useState("");
	const [showPassword, setShowPassword] = useState(false);

	// Verificar se o usuário usa login via Google (não precisa de senha)
	const isGoogleAuth = authProvider === "google";

	// Validação em tempo real: e-mails coincidem
	const emailsMatch = useMemo(() => {
		if (!confirmEmail) return null; // Não mostrar erro se campo vazio
		return newEmail.toLowerCase() === confirmEmail.toLowerCase();
	}, [newEmail, confirmEmail]);

	// Validação: novo e-mail é diferente do atual
	const isEmailDifferent = useMemo(() => {
		if (!newEmail) return true;
		return newEmail.toLowerCase() !== currentEmail.toLowerCase();
	}, [newEmail, currentEmail]);

	const handleSubmit = (e: React.FormEvent) => {
		e.preventDefault();

		// Validação frontend antes de enviar
		if (newEmail.toLowerCase() !== confirmEmail.toLowerCase()) {
			toast.error("Os e-mails não coincidem");
			return;
		}

		if (newEmail.toLowerCase() === currentEmail.toLowerCase()) {
			toast.error("O novo e-mail deve ser diferente do atual");
			return;
		}

		startTransition(async () => {
			const result = await updateEmailAction({
				password: isGoogleAuth ? undefined : password,
				newEmail,
				confirmEmail,
			});

			if (result.success) {
				toast.success(result.message);
				setPassword("");
				setNewEmail("");
				setConfirmEmail("");
			} else {
				toast.error(result.error);
			}
		});
	};

	return (
		<form onSubmit={handleSubmit} className="flex flex-col space-y-6">
			<div className="space-y-4 max-w-md">
				{/* E-mail atual (apenas informativo) */}
				<div className="space-y-2">
					<Label htmlFor="currentEmail">E-mail atual</Label>
					<Input
						id="currentEmail"
						type="email"
						value={currentEmail}
						disabled
						className="bg-muted cursor-not-allowed"
						aria-describedby="current-email-help"
					/>
					<p id="current-email-help" className="text-xs text-muted-foreground">
						Este é seu e-mail atual cadastrado
					</p>
				</div>

				{/* Senha de confirmação (apenas para usuários com login por e-mail/senha) */}
				{!isGoogleAuth && (
					<div className="space-y-2">
						<Label htmlFor="password">
							Senha atual <span className="text-destructive">*</span>
						</Label>
						<div className="relative">
							<Input
								id="password"
								type={showPassword ? "text" : "password"}
								value={password}
								onChange={(e) => setPassword(e.target.value)}
								disabled={isPending}
								placeholder="Digite sua senha para confirmar"
								required
								aria-required="true"
								aria-describedby="password-help"
							/>
							<button
								type="button"
								onClick={() => setShowPassword(!showPassword)}
								className="absolute right-3 top-1/2 -translate-y-1/2 text-muted-foreground hover:text-foreground"
								aria-label={showPassword ? "Ocultar senha" : "Mostrar senha"}
							>
								{showPassword ? (
									<RiEyeOffLine size={20} />
								) : (
									<RiEyeLine size={20} />
								)}
							</button>
						</div>
						<p id="password-help" className="text-xs text-muted-foreground">
							Por segurança, confirme sua senha antes de alterar seu e-mail
						</p>
					</div>
				)}

				{/* Novo e-mail */}
				<div className="space-y-2">
					<Label htmlFor="newEmail">
						Novo e-mail <span className="text-destructive">*</span>
					</Label>
					<Input
						id="newEmail"
						type="email"
						value={newEmail}
						onChange={(e) => setNewEmail(e.target.value)}
						disabled={isPending}
						placeholder="Digite o novo e-mail"
						required
						aria-required="true"
						aria-describedby="new-email-help"
						aria-invalid={!isEmailDifferent}
						className={
							!isEmailDifferent
								? "border-destructive focus-visible:ring-destructive"
								: ""
						}
					/>
					{!isEmailDifferent && newEmail && (
						<p
							className="text-xs text-destructive flex items-center gap-1"
							role="alert"
						>
							<RiCloseLine className="h-3.5 w-3.5" />O novo e-mail deve ser
							diferente do atual
						</p>
					)}
					{!newEmail && (
						<p id="new-email-help" className="text-xs text-muted-foreground">
							Digite o novo endereço de e-mail para sua conta
						</p>
					)}
				</div>

				{/* Confirmar novo e-mail */}
				<div className="space-y-2">
					<Label htmlFor="confirmEmail">
						Confirmar novo e-mail <span className="text-destructive">*</span>
					</Label>
					<div className="relative">
						<Input
							id="confirmEmail"
							type="email"
							value={confirmEmail}
							onChange={(e) => setConfirmEmail(e.target.value)}
							disabled={isPending}
							placeholder="Repita o novo e-mail"
							required
							aria-required="true"
							aria-describedby="confirm-email-help"
							aria-invalid={emailsMatch === false}
							className={
								emailsMatch === false
									? "border-destructive focus-visible:ring-destructive pr-10"
									: emailsMatch === true
										? "border-success focus-visible:ring-success pr-10"
										: ""
							}
						/>
						{/* Indicador visual de match */}
						{emailsMatch !== null && (
							<div className="absolute right-3 top-1/2 -translate-y-1/2">
								{emailsMatch ? (
									<RiCheckLine
										className="h-5 w-5 text-success"
										aria-label="Os e-mails coincidem"
									/>
								) : (
									<RiCloseLine
										className="h-5 w-5 text-destructive"
										aria-label="Os e-mails não coincidem"
									/>
								)}
							</div>
						)}
					</div>
					{/* Mensagem de erro em tempo real */}
					{emailsMatch === false && (
						<p
							id="confirm-email-help"
							className="text-xs text-destructive flex items-center gap-1"
							role="alert"
						>
							<RiCloseLine className="h-3.5 w-3.5" />
							Os e-mails não coincidem
						</p>
					)}
					{emailsMatch === true && (
						<p
							id="confirm-email-help"
							className="text-xs text-success flex items-center gap-1"
						>
							<RiCheckLine className="h-3.5 w-3.5" />
							Os e-mails coincidem
						</p>
					)}
				</div>
			</div>

			<div className="flex justify-end">
				<Button
					type="submit"
					disabled={isPending || emailsMatch === false || !isEmailDifferent}
					className="w-fit"
				>
					{isPending ? "Atualizando..." : "Atualizar e-mail"}
				</Button>
			</div>
		</form>
	);
}