import { SetFiles } from 'types/gallery';
import { Collection } from 'types/collection';
import { getEndpoint } from 'utils/common/apiUtil';
import { getToken } from 'utils/common/key';
import {
    decryptFile,
    mergeMetadata,
    preservePhotoswipeProps,
    sortFiles,
} from 'utils/file';
import { logError } from 'utils/sentry';
import localForage from 'utils/storage/localForage';
import { getCollection } from './collectionService';
import { EnteFile } from 'types/file';

import HTTPService from './HTTPService';
import { Trash, TrashItem } from 'types/trash';

const TRASH = 'file-trash';
const TRASH_TIME = 'trash-time';
const DELETED_COLLECTION = 'deleted-collection';

const ENDPOINT = getEndpoint();

export async function getLocalTrash() {
    const trash = (await localForage.getItem<Trash>(TRASH)) || [];
    return trash;
}

export async function getLocalDeletedCollections() {
    const trashedCollections: Array<Collection> =
        (await localForage.getItem<Collection[]>(DELETED_COLLECTION)) || [];
    return trashedCollections;
}

export async function cleanTrashCollections(fileTrash: Trash) {
    const trashedCollections = await getLocalDeletedCollections();
    const neededTrashCollections = new Set<number>(
        fileTrash.map((item) => item.file.collectionID)
    );
    const filterCollections = trashedCollections.filter((item) =>
        neededTrashCollections.has(item.id)
    );
    await localForage.setItem(DELETED_COLLECTION, filterCollections);
}

async function getLastSyncTime() {
    return (await localForage.getItem<number>(TRASH_TIME)) ?? 0;
}
export async function syncTrash(
    collections: Collection[],
    setFiles: SetFiles,
    files: EnteFile[]
): Promise<Trash> {
    const trash = await getLocalTrash();
    collections = [...collections, ...(await getLocalDeletedCollections())];
    const collectionMap = new Map<number, Collection>(
        collections.map((collection) => [collection.id, collection])
    );
    if (!getToken()) {
        return trash;
    }
    const lastSyncTime = await getLastSyncTime();

    const updatedTrash = await updateTrash(
        collectionMap,
        lastSyncTime,
        setFiles,
        files,
        trash
    );
    cleanTrashCollections(updatedTrash);
    return updatedTrash;
}

export const updateTrash = async (
    collections: Map<number, Collection>,
    sinceTime: number,
    setFiles: SetFiles,
    files: EnteFile[],
    currentTrash: Trash
): Promise<Trash> => {
    try {
        let updatedTrash: Trash = [...currentTrash];
        let time = sinceTime;

        let resp;
        do {
            const token = getToken();
            if (!token) {
                break;
            }
            resp = await HTTPService.get(
                `${ENDPOINT}/trash/v2/diff`,
                {
                    sinceTime: time,
                },
                {
                    'X-Auth-Token': token,
                }
            );
            for (const trashItem of resp.data.diff as TrashItem[]) {
                const collectionID = trashItem.file.collectionID;
                let collection = collections.get(collectionID);
                if (!collection) {
                    collection = await getCollection(collectionID);
                    collections.set(collectionID, collection);
                    localForage.setItem(DELETED_COLLECTION, [
                        ...collections.values(),
                    ]);
                }
                if (!trashItem.isDeleted && !trashItem.isRestored) {
                    trashItem.file = await decryptFile(
                        trashItem.file,
                        collection.key
                    );
                }
                updatedTrash.push(trashItem);
            }

            if (resp.data.diff.length) {
                time = resp.data.diff.slice(-1)[0].updatedAt;
            }
            updatedTrash = removeDuplicates(updatedTrash);
            updatedTrash = removeRestoredOrDeletedTrashItems(updatedTrash);

            setFiles(
                preservePhotoswipeProps(
                    sortFiles([
                        ...(files ?? []).map((file) => ({
                            ...file,
                            isTrashed: false,
                        })),
                        ...getTrashedFiles(updatedTrash),
                    ])
                )
            );
            await localForage.setItem(TRASH, updatedTrash);
            await localForage.setItem(TRASH_TIME, time);
        } while (resp.data.hasMore);
        return updatedTrash;
    } catch (e) {
        logError(e, 'Get trash files failed');
    }
    return currentTrash;
};

function removeDuplicates(trash: Trash) {
    const latestVersionTrashItems = new Map<number, TrashItem>();
    trash.forEach(({ file, updatedAt, ...rest }) => {
        if (
            !latestVersionTrashItems.has(file.id) ||
            latestVersionTrashItems.get(file.id).updatedAt < updatedAt
        ) {
            latestVersionTrashItems.set(file.id, { file, updatedAt, ...rest });
        }
    });
    trash = [];
    // eslint-disable-next-line @typescript-eslint/no-unused-vars
    for (const [_, trashedFile] of latestVersionTrashItems) {
        trash.push(trashedFile);
    }
    return trash;
}

function removeRestoredOrDeletedTrashItems(trash: Trash) {
    return trash.filter((item) => !item.isDeleted && !item.isRestored);
}

export function getTrashedFiles(trash: Trash) {
    return mergeMetadata(
        trash.map((trashedFile) => ({
            ...trashedFile.file,
            updationTime: trashedFile.updatedAt,
            isTrashed: true,
            deleteBy: trashedFile.deleteBy,
        }))
    );
}

export const emptyTrash = async () => {
    try {
        const token = getToken();
        if (!token) {
            return;
        }
        const lastUpdatedAt = await getLastSyncTime();

        await HTTPService.post(
            `${ENDPOINT}/trash/empty`,
            { lastUpdatedAt },
            null,
            {
                'X-Auth-Token': token,
            }
        );
    } catch (e) {
        logError(e, 'empty trash failed');
        throw e;
    }
};

export const clearLocalTrash = async () => {
    await localForage.setItem(TRASH, []);
};