"use client";

import { RiAttachment2 } from "@remixicon/react";
import { useRef, useTransition } from "react";
import { toast } from "sonner";
import {
	confirmAttachmentUploadAction,
	getPresignedUploadUrlAction,
} from "@/features/transactions/actions/attachments";
import {
	ALLOWED_MIME_TYPES,
	DEFAULT_MAX_FILE_SIZE_MB,
} from "@/features/transactions/attachments-config";

interface AttachmentUploadProps {
	transactionId: string;
	onUploaded: () => void;
	onPendingUpload?: (file: File) => void;
	maxSizeMb?: number;
}

export function AttachmentUpload({
	transactionId,
	onUploaded,
	onPendingUpload,
	maxSizeMb = DEFAULT_MAX_FILE_SIZE_MB,
}: AttachmentUploadProps) {
	const maxFileSizeBytes = maxSizeMb * 1024 * 1024;
	const inputRef = useRef<HTMLInputElement>(null);
	const [isPending, startTransition] = useTransition();

	function handleFileChange(e: React.ChangeEvent<HTMLInputElement>) {
		const file = e.target.files?.[0];
		if (!inputRef.current) return;
		inputRef.current.value = "";

		if (!file) return;

		if (
			!ALLOWED_MIME_TYPES.includes(
				file.type as (typeof ALLOWED_MIME_TYPES)[number],
			)
		) {
			toast.error(
				"Tipo de arquivo não suportado. Use PDF ou imagem (JPEG, PNG, WebP).",
			);
			return;
		}

		if (file.size > maxFileSizeBytes) {
			toast.error(`O arquivo deve ter no máximo ${maxSizeMb}MB.`);
			return;
		}

		if (onPendingUpload) {
			onPendingUpload(file);
			return;
		}

		startTransition(async () => {
			const presignResult = await getPresignedUploadUrlAction({
				fileName: file.name,
				mimeType: file.type,
				fileSize: file.size,
				transactionId,
			});

			if (!presignResult.success) {
				toast.error(presignResult.error ?? "Erro ao iniciar upload.");
				return;
			}

			const uploadResponse = await fetch(presignResult.presignedUrl, {
				method: "PUT",
				body: file,
				headers: { "Content-Type": file.type },
			});

			if (!uploadResponse.ok) {
				toast.error("Erro ao enviar o arquivo. Tente novamente.");
				return;
			}

			const confirmResult = await confirmAttachmentUploadAction({
				uploadToken: presignResult.uploadToken,
			});

			if (confirmResult.success) {
				toast.success(confirmResult.message);
				onUploaded();
			} else {
				toast.error(confirmResult.error);
			}
		});
	}

	return (
		<>
			<input
				ref={inputRef}
				type="file"
				className="hidden"
				accept={ALLOWED_MIME_TYPES.join(",")}
				onChange={handleFileChange}
			/>
			<button
				type="button"
				className="flex w-full cursor-pointer flex-col items-center justify-center gap-1 rounded-md border border-dashed py-4 text-sm text-muted-foreground transition-colors hover:border-foreground/40 hover:text-foreground disabled:pointer-events-none disabled:opacity-50"
				onClick={() => inputRef.current?.click()}
				disabled={isPending}
			>
				<span className="flex items-center gap-2">
					<RiAttachment2 className="size-4" />
					{isPending ? "Enviando..." : "Adicionar anexo"}
				</span>
				{!isPending && (
					<span className="text-xs">
						PDF, JPEG, PNG ou WebP · máx. {maxSizeMb} MB
					</span>
				)}
			</button>
		</>
	);
}