import { EnteFile } from 'types/file';
import { getEndpoint } from 'utils/common/apiUtil';
import { getToken } from 'utils/common/key';
import { logError } from 'utils/sentry';
import { getLocalFiles } from './fileService';
import HTTPService from './HTTPService';

const ENDPOINT = getEndpoint();

interface DuplicatesResponse {
    duplicates: Array<{
        fileIDs: number[];
        size: number;
    }>;
}

interface DuplicateFiles {
    files: EnteFile[];
    size: number;
}

class DeduplicationService {
    public async getDuplicateFiles() {
        try {
            const dupes = await this.fetchDuplicateFileIDs();
            let ids: number[] = [];
            for (const dupe of dupes) {
                ids = ids.concat(dupe.fileIDs);
            }

            const localFiles = await getLocalFiles();
            const fileMap = new Map<number, EnteFile>();
            for (const file of localFiles) {
                fileMap.set(file.id, file);
            }

            const result: DuplicateFiles[] = [];

            const missingFileIDs: number[] = [];

            for (const dupe of dupes) {
                const files: EnteFile[] = [];
                for (const fileID of dupe.fileIDs) {
                    if (fileMap.has(fileID)) {
                        files.push(fileMap.get(fileID));
                    } else {
                        missingFileIDs.push(fileID);
                    }
                }

                if (files.length > 1) {
                    result.push({
                        files,
                        size: dupe.size,
                    });
                }
            }

            return result;
        } catch (e) {
            logError(e, 'failed to get');
        }
    }

    public async clubDuplicatesByTime(dupes: DuplicateFiles[]) {
        const result: DuplicateFiles[] = [];
        for (const dupe of dupes) {
            let files: EnteFile[] = [];
            const creationTimeCounter = new Map<number, number>();

            let mostFreqCreationTime = 0;
            let mostFreqCreationTimeCount = 0;
            for (const file of dupe.files) {
                const creationTime = file.metadata.creationTime;
                if (creationTimeCounter.has(creationTime)) {
                    creationTimeCounter.set(
                        creationTime,
                        creationTimeCounter.get(creationTime) + 1
                    );
                } else {
                    creationTimeCounter.set(creationTime, 1);
                }
                if (
                    creationTimeCounter.get(creationTime) >
                    mostFreqCreationTimeCount
                ) {
                    mostFreqCreationTime = creationTime;
                    mostFreqCreationTimeCount =
                        creationTimeCounter.get(creationTime);
                }

                files.push(file);
            }

            files = files.filter((file) => {
                return file.metadata.creationTime === mostFreqCreationTime;
            });

            if (files.length > 1) {
                result.push({
                    files,
                    size: dupe.size,
                });
            }
        }

        return result;
    }

    private async fetchDuplicateFileIDs() {
        try {
            const response = await HTTPService.get(
                `${ENDPOINT}/files/duplicates`,
                null,
                {
                    'X-Auth-Token': getToken(),
                }
            );
            return (response.data as DuplicatesResponse).duplicates;
        } catch (e) {
            logError(e, 'failed to get');
        }
    }
}

export default new DeduplicationService();