import axios from 'axios';
import { getFileUploadUrl } from '@/api/server/files';
import tw, { styled } from 'twin.macro';
import Button from '@/components/elements/Button';
import React, { useEffect, useRef, useState } from 'react';
import { ModalMask } from '@/components/elements/Modal';
import Fade from '@/components/elements/Fade';
import useEventListener from '@/plugins/useEventListener';
import useFlash from '@/plugins/useFlash';
import useFileManagerSwr from '@/plugins/useFileManagerSwr';
import { ServerContext } from '@/state/server';
import { WithClassname } from '@/components/types';

const InnerContainer = styled.div`
    max-width: 600px;
    ${tw`bg-black w-full border-4 border-primary-500 border-dashed rounded p-10 mx-10`};
`;

function isFileOrDirectory (event: DragEvent): boolean {
    if (!event.dataTransfer?.types) {
        return false;
    }

    for (let i = 0; i < event.dataTransfer.types.length; i++) {
        // Check if the item being dragged is not a file.
        if (event.dataTransfer.types[i] !== 'Files') {
            return false;
        }
    }

    return true;
}

export default ({ className }: WithClassname) => {
    const fileUploadInput = useRef<HTMLInputElement>(null);

    const [ timeouts, setTimeouts ] = useState<NodeJS.Timeout[]>([]);
    const [ visible, setVisible ] = useState(false);
    const { mutate } = useFileManagerSwr();
    const { clearFlashes, clearAndAddHttpError } = useFlash();

    const uuid = ServerContext.useStoreState(state => state.server.data!.uuid);
    const directory = ServerContext.useStoreState(state => state.files.directory);
    const appendFileUpload = ServerContext.useStoreActions(actions => actions.files.appendFileUpload);
    const removeFileUpload = ServerContext.useStoreActions(actions => actions.files.removeFileUpload);

    useEventListener('dragenter', e => {
        if (!isFileOrDirectory(e)) {
            return;
        }
        e.stopPropagation();
        setVisible(true);
    }, true);

    useEventListener('dragexit', e => {
        if (!isFileOrDirectory(e)) {
            return;
        }
        e.stopPropagation();
        setVisible(false);
    }, true);

    useEffect(() => {
        if (!visible) return;

        const hide = () => setVisible(false);

        window.addEventListener('keydown', hide);
        return () => {
            window.removeEventListener('keydown', hide);
        };
    }, [ visible ]);

    useEffect(() => {
        return () => timeouts.forEach(clearTimeout);
    }, []);

    const onFileSubmission = (files: FileList) => {
        const formData: FormData[] = [];
        Array.from(files).forEach(file => {
            const form = new FormData();
            form.append('files', file);
            formData.push(form);
        });

        clearFlashes('files');

        Promise.all(
            Array.from(formData).map(f => getFileUploadUrl(uuid)
                .then(url => axios.post(`${url}&directory=${directory}`, f, {
                    headers: { 'Content-Type': 'multipart/form-data' },
                    onUploadProgress: (data: ProgressEvent) => {
                        // @ts-ignore
                        const name = f.getAll('files')[0].name;

                        appendFileUpload({
                            name: name,
                            loaded: data.loaded,
                            total: data.total,
                        });

                        if (data.loaded === data.total) {
                            const timeout = setTimeout(() => removeFileUpload(name), 5000);
                            setTimeouts(t => [ ...t, timeout ]);
                        }
                    },
                }))
            )
        )
            .then(() => mutate())
            .catch(error => {
                console.error(error);
                clearAndAddHttpError({ key: 'files', error });
            });
    };

    return (
        <>
            <Fade
                appear
                in={visible}
                timeout={75}
                key={'upload_modal_mask'}
                unmountOnExit
            >
                <ModalMask
                    onClick={() => setVisible(false)}
                    onDragOver={e => e.preventDefault()}
                    onDrop={e => {
                        e.preventDefault();
                        e.stopPropagation();

                        setVisible(false);
                        if (!e.dataTransfer?.files.length) return;

                        onFileSubmission(e.dataTransfer.files);
                    }}
                >
                    <div css={tw`w-full flex items-center justify-center pointer-events-none`}>
                        <InnerContainer>
                            <p css={tw`text-lg text-neutral-200 text-center`}>
                                Drag and drop files to upload.
                            </p>
                        </InnerContainer>
                    </div>
                </ModalMask>
            </Fade>
            <input
                type={'file'}
                ref={fileUploadInput}
                css={tw`hidden`}
                onChange={e => {
                    if (!e.currentTarget.files) return;
                    onFileSubmission(e.currentTarget.files);
                    if (fileUploadInput.current) {
                        fileUploadInput.current.files = null;
                    }
                }}
            />
            <Button
                className={className}
                onClick={() => fileUploadInput.current && fileUploadInput.current.click()}
            >
                Upload
            </Button>
        </>
    );
};