import { v4 as uuidv4 } from 'uuid';

import { getCurrentConference } from '../base/conference/functions';
import { getLocalParticipant, getParticipantDisplayName } from '../base/participants/functions';
import MiddlewareRegistry from '../base/redux/MiddlewareRegistry';
import { showErrorNotification } from '../notifications/actions';
import { NOTIFICATION_TIMEOUT_TYPE, NOTIFICATION_TYPE } from '../notifications/constants';

import { DOWNLOAD_FILE, REMOVE_FILE, UPLOAD_FILES } from './actionTypes';
import { addFile, removeFile, updateFileProgress } from './actions';
import { getFileExtension } from './functions.any';
import logger from './logger';
import { FILE_SHARING_PREFIX } from './constants';
import { IFileMetadata } from './types';

/**
 * Middleware that handles file sharing actions.
 *
 * @param {Store} store - The redux store.
 * @returns {Function}
 */
MiddlewareRegistry.register(store => next => action => {
    switch (action.type) {
    case UPLOAD_FILES: {
        const state = store.getState();
        const conference = getCurrentConference(state);
        const sessionId = conference?.getMeetingUniqueId();
        const localParticipant = getLocalParticipant(state);
        const { fileSharing } = state['features/base/config'];
        const { connection } = state['features/base/connection'];
        const { jwt } = state['features/base/jwt'];
        const roomJid = conference?.room?.roomjid;

        for (const file of action.files) {
            const jid = connection!.getJid();
            const fileId = uuidv4();
            const fileMetadata: IFileMetadata = {
                authorParticipantId: localParticipant!.id,
                authorParticipantJid: jid,
                authorParticipantName: getParticipantDisplayName(state, localParticipant!.id),
                conferenceFullName: roomJid ?? '',
                fileId,
                fileName: file.name,
                fileSize: file.size,
                fileType: getFileExtension(file.name),
                timestamp: Date.now()
            };

            store.dispatch(addFile(fileMetadata));
            store.dispatch(updateFileProgress(fileId, 1));

            // Upload file.
            const formData = new FormData();

            formData.append('metadata', JSON.stringify(fileMetadata));

            // @ts-ignore
            formData.append('file', file as Blob, file.name);

            // Use XMLHttpRequest to track upload
            const xhr = new XMLHttpRequest();

            const handleError = () => {
                logger.warn('Could not upload file:', xhr.statusText);

                store.dispatch(removeFile(fileId));
                store.dispatch(showErrorNotification({
                    titleKey: 'fileSharing.uploadFailedTitle',
                    descriptionKey: 'fileSharing.uploadFailedDescription',
                    appearance: NOTIFICATION_TYPE.ERROR
                }, NOTIFICATION_TIMEOUT_TYPE.STICKY));
            };

            xhr.open('POST', `${fileSharing!.apiUrl!}/sessions/${sessionId}/files`);
            xhr.responseType = 'json';

            if (jwt) {
                xhr.setRequestHeader('Authorization', `Bearer ${jwt}`);
            }

            xhr.upload.onprogress = event => {
                if (event.lengthComputable) {
                    // We use 99% as the max value to avoid showing 100% before the
                    // upload is actually finished, that is, when the request is completed.
                    const percent = Math.max((event.loaded / event.total) * 100, 99);

                    store.dispatch(updateFileProgress(fileId, percent));
                }
            };

            xhr.onload = () => {
                if (xhr.status >= 200 && xhr.status < 300) {
                    store.dispatch(updateFileProgress(fileId, 100));

                    const metadataHandler = conference?.getMetadataHandler();

                    metadataHandler?.setMetadata(`${FILE_SHARING_PREFIX}.${fileId}`, fileMetadata);
                } else {
                    handleError();
                }
            };

            xhr.onerror = handleError;

            xhr.send(formData);
        }

        return next(action);
    }

    case REMOVE_FILE: {
        const state = store.getState();
        const conference = getCurrentConference(state);
        const { fileSharing } = state['features/base/config'];
        const { jwt } = state['features/base/jwt'];
        const sessionId = conference?.getMeetingUniqueId();
        let doDelete = false;

        // First remove the file metadata so others won't attempt to download it anymore.
        const metadataHandler = conference?.getMetadataHandler();

        if (metadataHandler) {
            const metadataId = `${FILE_SHARING_PREFIX}.${action.fileId}`;
            const existingMetadata = metadataHandler.getMetadata()[metadataId] ?? {};

            doDelete = (existingMetadata?.process ?? 100) === 100;

            metadataHandler.setMetadata(metadataId, {});
        }

        if (!doDelete) {
            return next(action);
        }

        // Now delete it from the server.
        fetch(`${fileSharing!.apiUrl!}/sessions/${sessionId}/files/${action.fileId}`, {
            method: 'DELETE',
            headers: {
                ...jwt && { 'Authorization': `Bearer ${jwt}` }
            }
        })
        .then(response => {
            if (!response.ok) {
                throw new Error(`Failed to delete file: ${response.statusText}`);
            }
        })
        .catch(error => {
            logger.warn('Could not delete file:', error);
        });

        return next(action);
    }

    case DOWNLOAD_FILE: {
        const state = store.getState();
        const { fileSharing } = state['features/base/config'];
        const conference = getCurrentConference(state);
        const sessionId = conference?.getMeetingUniqueId();

        fetch(`${fileSharing!.apiUrl!}/sessions/${sessionId}/document`, {
            method: 'GET',
            headers: {
                'X-File-Id': action.fileId,
            }
        })
        .then(response => response.json())
        .then(data => {
            const url = data.presignedUrl;

            if (!url) {
                throw new Error('No presigned URL found in the response.');
            }

            window.open(url, '_blank', 'noreferrer,noopener');
        })
        .catch(error => {
            logger.warn('Could not download file:', error);

            store.dispatch(showErrorNotification({
                titleKey: 'fileSharing.downloadFailedTitle',
                descriptionKey: 'fileSharing.downloadFailedDescription',
                appearance: NOTIFICATION_TYPE.ERROR
            }, NOTIFICATION_TIMEOUT_TYPE.STICKY));
        });

        return next(action);
    }
    }

    return next(action);
});