import React from 'react';
import { View, Button, Alert, Text } from 'react-native';
// Redux
import { connect } from 'react-redux';
import { initDirectories } from '../Store/Actions/directories';
import { initContact } from '../Store/Actions/contacts';
// Style
import styles from '../../Resources/Styles/SyncStyle';
// Translations
import i18n from "../../I18n";
// Controller 
import SyncController from '../Controllers/SyncController';
// Progress
import * as Progress from 'react-native-progress';
// Database 
import { User, Contact, Directory, Document } from '../../Database';
// FileSytem
import * as FileSystem from 'expo-file-system';

function mapStateToProps(state) {
    return {
        syncVersion: state.app.syncVersion,
        currentUser: state.app.currentUser,
        locale: state.locale.locale,
        mainColor: state.app.mainColor
    };
}

const mapDispatchToProps = dispatch => {
    return {
        init: () => dispatch({ type: 'INIT' }),
        initUsers: () => dispatch({ type: 'INIT_USERS' }),
        initDirectories: (lang, user) => dispatch(initDirectories(lang, user)),
        initContact: currentUser => dispatch(initContact(currentUser)),
        initBtns: () => dispatch({ type: 'INIT_HOME_BTNS' }),
        updateVersion: version => dispatch({
            type: 'UPDATE_VERSION',
            data: version,
        }),
        updateShowIsActive: value => dispatch({
            type: 'UPDATE_SHOW_IS_ACTIVE',
            data: value,
        })
    };
};

class SyncScreen extends React.Component {
    state = {
        progress: 0,
        txtStep: '',
        downloadProgress: 0,
        downloadingFile: false,
        processing: false,
        newApp: false,
        forced: false
    };

    componentDidMount() {
        const { forceSync } = this.props.route.params;
        if (forceSync === true) {
            this.setState({ forced: true });
            this.sync();
        }
    }

    render() {
        const fileProgress = this.fileProgress();
        return (
            <View style={styles.container}>
                <Progress.Circle
                    size={250}
                    progress={this.state.progress}
                    showsText={true}
                    color={this.props.mainColor}
                />
                <View style={styles.btnWrapper}>
                    <Button
                        disabled={this.state.processing}
                        color={this.props.mainColor}
                        title={i18n.t('sync_s.start_sync')}
                        onPress={() => this.sync()}
                    />
                </View>
                <View style={styles.btnWrapper}>
                    <Text>
                        {this.state.txtStep} {fileProgress}
                    </Text>
                </View>
            </View>
        );
    }

    async sync() {
        if (!SyncController.checkConnection()) {
            Alert.alert(
                i18n.t('global.warning'),
                i18n.t('error.must_be_connected_internet_sync')
            );
            return;
        }
        this.setState({ processing: true });
        // getVersion
        const resVersion = await SyncController.getVersion().then(res => {
            return res.data;
        }).catch(error => {
            console.log(error);
            Alert.alert(
                i18n.t('error.error'),
                i18n.t('error.error_has_occurred')
            );
        });
        this.props.updateVersion(resVersion.version);
        this.props.updateShowIsActive(resVersion.ShowIsActive);
        this.setState({ newApp: resVersion.newApp });
        // getUsers
        this.setState({ txtStep: i18n.t('sync_s.updating_users') + '...' });
        const resUsers = await SyncController.getUsers().then(res => {
            User.clear();
            return res.data;
        }).catch(error => {
            console.log(error);
            Alert.alert(
                i18n.t('error.error'),
                i18n.t('error.error_has_occurred')
            );
        });
        resUsers.forEach(user => {
            User.add(user);
        });
        // getContacts
        this.setState({ progress: 0.1, txtStep: i18n.t('sync_s.updating_contacts') + '...' });
        const resContacts = await SyncController.getContacts(this.props.currentUser.id).then(res => {
            Contact.clear();
            return res.data;
        }).catch(error => {
            console.log(error);
            Alert.alert(
                i18n.t('error.error'),
                i18n.t('error.error_has_occurred')
            );
        });
        resContacts.forEach(contact => {
            Contact.add(contact);
        });
        //sendBrochures
        this.setState({ progress: 0.2, txtStep: i18n.t('sync_s.sending_flyers') + '...' });
        await SyncController.sendBrochures();
        //getDirectories
        this.setState({ progress: 0.3, txtStep: i18n.t('sync_s.updating_folders') + '...' });
        const resDirectories = await SyncController.getDirectories().then(res => {
            Directory.clear();
            return res.data;
        }).catch(error => {
            console.log(error);
            Alert.alert(
                i18n.t('error.error'),
                i18n.t('error.error_has_occurred')
            );
        });
        resDirectories.forEach(dir => {
            Directory.add(dir);
        });
        // getDocuments
        this.setState({ progress: 0.4, txtStep: i18n.t('sync_s.updating_docs') + '...' });
        const resDocuments = await SyncController.getDocuments().then(res => {
            return res.data;
        }).catch(error => {
            console.log(error);
            Alert.alert(
                i18n.t('error.error'),
                i18n.t('error.error_has_occurred')
            );
        });
        const toDelete = Document.clear(resDocuments);
        resDocuments.forEach(document => {
            Document.update(document);
        });
        this.downloadDocuments(Document.getAll(), toDelete);
        // End
        this.setState({ txtStep: i18n.t('sync_s.update_completed') + '.', processing: false });
    }

    fileProgress() {
        if (this.state.downloadingFile === true) {
            return this.state.downloadProgress + ' %';
        }
    }

    downloadDocuments(docs, toDelete) {
        const version = this.props.syncVersion;
        this.getToDL(docs, 0).then(toDownload => {
            if (toDownload.length > 0) {
                this.setState({ progress: 0.5 });
                const docProgress = 0.5 / toDownload.length;
                this.download(toDownload, docProgress, 0).then(status => {
                    if (status === true) {
                        this.deleteFile(toDelete, 0).then(status => {
                            this.finishSync(version);
                        });
                    } else {
                        this.setState({ txtStep: i18n.t('error.error_has_occurred') + '.' });
                    }
                });
            } else {
                this.deleteFile(toDelete, 0).then(status => {
                    this.setState({ progress: 1 });
                    this.finishSync(version);
                });
            }
        });
    }

    async getToDL(docs, i, toDL = []) {
        if (docs.length < 1)
            return toDL;
        const item = docs[i];
        const { exists, modificationTime } = await FileSystem.getInfoAsync(FileSystem.documentDirectory + item.uuid + '.' + item.type);
        if (exists === false) {
            toDL.push(item);
        } else {
            if (modificationTime.toString() !== item.updated_at) {
                toDL.push(item);
            }
        }
        if (i < docs.length - 1) {
            return this.getToDL(docs, i + 1, toDL);
        }
        return toDL;
    }

    async deleteFile(docs, i) {
        if (docs.length > 0) {
            const file = docs[i];
            await FileSystem.deleteAsync(FileSystem.documentDirectory + file.uuid + '.' + file.type, { idempotent: true });
            if (i < docs.length - 1) {
                return this.deleteFile(docs, i + 1);
            }
        }
        return true;
    }

    callback(downloadProgress) {
        let progress =
            (downloadProgress.totalBytesWritten /
                downloadProgress.totalBytesExpectedToWrite) *
            100;
        progress = Math.round(progress);
        progress = progress.toString();
        this.setState({
            downloadProgress: progress,
        });
    }

    downloadResumable(url, uuid, type) {
        return FileSystem.createDownloadResumable(
            url,
            FileSystem.documentDirectory + uuid + '.' + type,
            {},
            this.callback.bind(this),
        );
    }

    async download(documents, progress, i) {
        if (this.state.downloadingFile === false) {
            this.setState({ downloadingFile: true });
        }
        const endpoint = 'https://dev-app.rhd-ldc.fr/storage/docs/'
        const doc = documents[i];
        this.setState({
            txtStep:
                i18n.t('sync_s.download') + ' : ' +
                doc.title +
                ' (' +
                doc.type.toUpperCase() +
                ') ...',
        });
        try {
            await this.downloadResumable(
                endpoint + doc.uuid + "." + doc.type,
                doc.uuid,
                doc.type,
            ).downloadAsync();
            const { modificationTime } = await FileSystem.getInfoAsync(FileSystem.documentDirectory + doc.uuid + '.' + doc.type);
            SyncController.updateLastModificationDoc(doc.id, modificationTime);
            //console.log('Finished downloading to ', uri);
            this.setState({ progress: this.state.progress + progress });
            if (i < documents.length - 1) {
                return this.download(documents, progress, i + 1);
            }
            this.setState({ downloadingFile: false });
            return true;
        } catch (e) {
            console.error(e);
            return false;
        }
    }

    finishSync(version) {
        this.props.init();
        this.props.initUsers();
        this.props.initContact(this.props.currentUser);
        this.props.initDirectories(this.props.locale.value, this.props.currentUser);
        this.props.initBtns();
        if (this.state.forced) {
            SyncController.setInstalled();
        }
        SyncController.updateVersion(version);
        this.setState({ txtStep: i18n.t('sync_s.update_completed') + '.', processing: false });
        if (this.state.newApp === true) {
            const appUUID = '1f6eda31-1f6d-49fe-aa81-4f0aece0f7ca';
            const url = 'https://store.ldc.fr' + '/app/' + appUUID;
            Alert.alert(
                'LDC Store',
                i18n.t('sync_s.new_app_version'),
                [
                    {
                        text: i18n.t('global.cancel'),
                        onPress: () => console.log('Cancel Pressed'),
                        style: 'cancel',
                    },
                    { text: i18n.t('sync_s.open_store'), onPress: () => Linking.openURL(url).catch((err) => console.error('An error occurred', err)) },
                ],
                { cancelable: false },
            );
        }
    }

}

export default connect(mapStateToProps, mapDispatchToProps)(SyncScreen);