// Copyright (c) 2015-present Mattermost, Inc. All Rights Reserved.
// See LICENSE.txt for license information.

import RNUtils from '@mattermost/rnutils';
import {applicationName} from 'expo-application';
import {Alert, Linking, Platform, StatusBar} from 'react-native';
import DocumentPicker, {type DocumentPickerResponse} from 'react-native-document-picker';
import {type Asset, type CameraOptions, type ImageLibraryOptions, type ImagePickerResponse, launchCamera, launchImageLibrary} from 'react-native-image-picker';
import Permissions from 'react-native-permissions';

import {dismissBottomSheet} from '@screens/navigation';
import {extractFileInfo, lookupMimeType} from '@utils/file';
import {logWarning} from '@utils/log';
import {safeDecodeURIComponent} from '@utils/url';

import type {IntlShape} from 'react-intl';

type PermissionSource = 'camera' | 'storage' | 'photo_android' | 'photo_ios' | 'photo';

export default class FilePickerUtil {
    private readonly uploadFiles: (files: ExtractedFileInfo[]) => void;
    private readonly intl: IntlShape;

    constructor(
        intl: IntlShape,
        uploadFiles: (files: ExtractedFileInfo[]) => void) {
        this.intl = intl;
        this.uploadFiles = uploadFiles;
    }

    private getPermissionMessages = (source: PermissionSource) => {
        const {formatMessage} = this.intl;
        const permissions: Record<string, { title: string; text: string }> = {
            camera: {
                title: formatMessage(
                    {
                        id: 'mobile.camera_photo_permission_denied_title',
                        defaultMessage:
                            '{applicationName} would like to access your camera',
                    },
                    {applicationName},
                ),
                text: formatMessage({
                    id: 'mobile.camera_photo_permission_denied_description',
                    defaultMessage:
                        'Take photos and upload them to your server or save them to your device. Open Settings to grant {applicationName} read and write access to your camera.',
                }, {applicationName}),
            },
            storage: {
                title: formatMessage(
                    {
                        id: 'mobile.storage_permission_denied_title',
                        defaultMessage:
                            '{applicationName} would like to access your files',
                    },
                    {applicationName},
                ),
                text: formatMessage({
                    id: 'mobile.storage_permission_denied_description',
                    defaultMessage:
                        'Upload files to your server. Open Settings to grant {applicationName} Read and Write access to files on this device.',
                }, {applicationName}),
            },
            photo_ios: {
                title: formatMessage(
                    {
                        id: 'mobile.ios.photos_permission_denied_title',
                        defaultMessage:
                            '{applicationName} would like to access your photos',
                    },
                    {applicationName},
                ),
                text: formatMessage({
                    id: 'mobile.ios.photos_permission_denied_description',
                    defaultMessage:
                        'Upload photos and videos to your server or save them to your device. Open Settings to grant {applicationName} Read and Write access to your photo and video library.',
                }, {applicationName}),
            },
            photo_android: {
                title: formatMessage(
                    {
                        id: 'mobile.android.photos_permission_denied_title',
                        defaultMessage:
                            '{applicationName} would like to access your photos',
                    },
                    {applicationName},
                ),
                text: formatMessage({
                    id: 'mobile.android.photos_permission_denied_description',
                    defaultMessage:
                        'Upload photos to your server or save them to your device. Open Settings to grant {applicationName} Read and Write access to your photo library.',
                }, {applicationName}),
            },
        };

        return permissions[source];
    };

    private prepareFileUpload = async (files: Array<Asset | DocumentPickerResponse>) => {
        const out = await extractFileInfo(files);

        if (out.length > 0) {
            dismissBottomSheet();
            this.uploadFiles(out);
        }
    };

    private getPermissionDeniedMessage = (source?: PermissionSource) => {
        const sources = ['camera', 'storage'];
        const deniedSource: PermissionSource = Platform.select({android: 'photo_android', ios: 'photo_ios'})!;
        const msgForSource = source && sources.includes(source) ? source : deniedSource;

        return this.getPermissionMessages(msgForSource);
    };

    private getFilesFromResponse = async (response: ImagePickerResponse): Promise<Asset[]> => {
        if (!response?.assets?.length) {
            logWarning('no assets in response');
            return [];
        }

        const files: Asset[] = [];

        await Promise.all((response.assets.map(async (file) => {
            if (Platform.OS === 'ios') {
                files.push(file);
            } else if (file.uri) {
                const uri = await RNUtils.getRealFilePath(file.uri);
                const type = file.type || lookupMimeType(uri);
                let fileName = file.fileName;
                if (type.includes('video/') && uri) {
                    fileName = safeDecodeURIComponent(uri.split('\\').pop()?.split('/').pop() || '');
                }

                if (uri) {
                    files.push({...file, fileName, uri, type, width: file.width, height: file.height});
                } else {
                    logWarning('attaching file reponse return empty uri', file);
                }
            }
        })));

        return files;
    };

    private hasPhotoPermission = async (source: PermissionSource) => {
        let permissionRequest;

        const targetSource = Platform.select({
            ios: source === 'camera' ? Permissions.PERMISSIONS.IOS.CAMERA : Permissions.PERMISSIONS.IOS.PHOTO_LIBRARY,
            default: Permissions.PERMISSIONS.ANDROID.CAMERA,
        });

        const hasPhotoLibraryPermission = await Permissions.check(targetSource);

        switch (hasPhotoLibraryPermission) {
            case Permissions.RESULTS.DENIED:
                permissionRequest = await Permissions.request(targetSource);
                return permissionRequest === Permissions.RESULTS.GRANTED;
            case Permissions.RESULTS.BLOCKED: {
                const grantOption = {
                    text: this.intl.formatMessage({
                        id: 'mobile.permission_denied_retry',
                        defaultMessage: 'Settings',
                    }),
                    onPress: () => Permissions.openSettings(),
                };

                const {title, text} = this.getPermissionDeniedMessage(source);

                Alert.alert(title, text, [
                    grantOption,
                    {
                        text: this.intl.formatMessage({
                            id: 'mobile.permission_denied_dismiss',
                            defaultMessage: "Don't Allow",
                        }),
                    },
                ]);
                return false;
            }
            default: return true;
        }
    };

    private hasStoragePermission = async () => {
        if (Platform.OS === 'android' && Platform.Version < 32) {
            const storagePermission = Permissions.PERMISSIONS.ANDROID.READ_EXTERNAL_STORAGE;
            let permissionRequest;
            const hasPermissionToStorage = await Permissions.check(storagePermission);
            switch (hasPermissionToStorage) {
                case Permissions.RESULTS.DENIED:
                    permissionRequest = await Permissions.request(storagePermission);
                    return permissionRequest === Permissions.RESULTS.GRANTED;
                case Permissions.RESULTS.BLOCKED: {
                    const {title, text} = this.getPermissionDeniedMessage();

                    Alert.alert(title, text, [
                        {
                            text: this.intl.formatMessage({
                                id: 'mobile.permission_denied_dismiss',
                                defaultMessage: "Don't Allow",
                            }),
                        },
                        {
                            text: this.intl.formatMessage({
                                id: 'mobile.permission_denied_retry',
                                defaultMessage: 'Settings',
                            }),
                            onPress: () => Linking.openSettings(),
                        },
                    ]);
                    return false;
                }
                default: return true;
            }
        }

        return true;
    };

    private hasWriteStoragePermission = async () => {
        if (Platform.OS === 'android' && Platform.Version <= 28) {
            const storagePermission = Permissions.PERMISSIONS.ANDROID.WRITE_EXTERNAL_STORAGE;
            let permissionRequest;
            const hasPermissionToStorage = await Permissions.check(storagePermission);
            switch (hasPermissionToStorage) {
                case Permissions.RESULTS.DENIED:
                    permissionRequest = await Permissions.request(storagePermission);
                    return permissionRequest === Permissions.RESULTS.GRANTED;
                case Permissions.RESULTS.BLOCKED: {
                    const {title, text} = this.getPermissionDeniedMessage('storage');

                    Alert.alert(title, text, [
                        {
                            text: this.intl.formatMessage({
                                id: 'mobile.permission_denied_dismiss',
                                defaultMessage: "Don't Allow",
                            }),
                        },
                        {
                            text: this.intl.formatMessage({
                                id: 'mobile.permission_denied_retry',
                                defaultMessage: 'Settings',
                            }),
                            onPress: () => Linking.openSettings(),
                        },
                    ]);
                    return false;
                }
                default: return true;
            }
        }

        return true;
    };

    private buildUri = async (doc: DocumentPickerResponse) => {
        let uri: string = doc.fileCopyUri || doc.uri;

        if (Platform.OS === 'android') {
            if (doc.fileCopyUri) {
                uri = doc.fileCopyUri;
            } else {
                // For android we need to retrieve the realPath in case the file being imported is from the cloud
                const newUri = await RNUtils.getRealFilePath(doc.uri);
                if (newUri == null) {
                    return {doc: undefined};
                }

                uri = newUri;
            }
        }

        doc.uri = uri;
        return {doc};
    };

    attachFileFromCamera = async (customOptions?: CameraOptions) => {
        let options = customOptions;
        if (!options) {
            options = {
                quality: 0.8,
                videoQuality: 'high',
                mediaType: 'photo',
                saveToPhotos: true,
            };
        }

        const hasCameraPermission = await this.hasPhotoPermission('camera');

        let hasWriteToStoragePermission = true;
        if (Platform.OS === 'android' && Platform.Version <= 28) {
            hasWriteToStoragePermission = await this.hasWriteStoragePermission();
        }

        if (hasCameraPermission && hasWriteToStoragePermission) {
            launchCamera(options, async (response: ImagePickerResponse) => {
                StatusBar.setHidden(false);

                if (response.errorCode || response.didCancel) {
                    return;
                }

                const files = await this.getFilesFromResponse(response);
                await this.prepareFileUpload(files);
            });
        }
    };

    attachFileFromFiles = async (browseFileType?: string, allowMultiSelection = false) => {
        const hasPermission = await this.hasStoragePermission();
        const fileType = browseFileType ?? Platform.select({ios: 'public.item', default: '*/*'});

        if (hasPermission) {
            try {
                const docResponse = (await DocumentPicker.pick({allowMultiSelection, type: [fileType], copyTo: 'cachesDirectory'}));
                const proDocs = docResponse.map(async (d: DocumentPickerResponse) => {
                    const {doc} = await this.buildUri(d);
                    return doc;
                });

                const docs = (await Promise.all(proDocs)).filter(
                    (item): item is DocumentPickerResponse => item !== undefined,
                );

                await this.prepareFileUpload(docs);
                return {error: undefined};
            } catch (error) {
                return {error};
            }
        }

        return {error: 'no permission'};
    };

    attachFileFromPhotoGallery = async (selectionLimit = 1) => {
        const options: ImageLibraryOptions = {
            quality: 1,
            mediaType: 'mixed',
            includeBase64: false,
            selectionLimit,
        };

        const hasPermission = await this.hasPhotoPermission('photo');
        if (hasPermission) {
            launchImageLibrary(options, async (response: ImagePickerResponse) => {
                StatusBar.setHidden(false);
                if (response.errorMessage || response.didCancel) {
                    logWarning('Attach failed', response.errorMessage || (response.didCancel ? 'cancelled' : ''));
                    return;
                }

                const files = await this.getFilesFromResponse(response);
                await this.prepareFileUpload(files);
            });
        }
    };
}