import {Button, Header, Icon, Modal, Placeholder, Progress, Segment, Table} from "./Theme";
import {
    Checkbox,
    Form,
    Grid,
    IconGroup,
    Input,
    PlaceholderLine,
    TableBody,
    TableCell,
    TableHeader,
    TableHeaderCell,
    TableRow
} from "semantic-ui-react";
import {
    APIButton,
    DirectorySearch,
    ErrorMessage,
    FileIcon,
    humanFileSize,
    mimetypeIconName,
    Toggle,
    useIsIgnoredDirectory
} from "./Common";
import React, {useEffect, useState} from "react";
import {useDropzone} from "react-dropzone";
import {deleteFile, ignoreDirectory, makeDirectory, movePaths, renamePath, unignoreDirectory} from "../api";
import _ from 'lodash';
import {SortableTable} from "./SortableTable";
import {useBrowseFiles, useMediaDirectory, useUploadFile, useWROLMode} from "../hooks/customHooks";
import {FileRowTagIcon, FilesRefreshButton} from "./Files";
import {FilePreviewContext} from "./FilePreview";
import {SettingsContext, ThemeContext} from "../contexts/contexts";
import {BulkTagModal} from "./BulkTagModal";
import {InlineErrorBoundary} from "./ErrorBoundary";

function depthIndentation(path) {
    // Repeated spaces for every folder a path is in.
    const depth = (path.match(/\//g) || []).length;
    return '\xa0\xa0\xa0\xa0'.repeat(depth);
}

export function pathDirectory(path) {
    // Return the full path of the path's directory.
    // pathDirectory('/some/directory/file.txt') -> '/some/directory'
    return path.substring(0, path.lastIndexOf('/'));
}

export function pathName(path) {
    // Return the file's name.
    // pathName('/some/directory/file.txt') -> 'file.txt'
    // pathName('/some/directory') -> 'directory'
    if (path.endsWith('/')) {
        // Path is a directory, return its name.
        path = path.substring(0, path.length - 1);
    }
    return path.substring(path.lastIndexOf('/') + 1);
}

export function splitPathParentAndName(path) {
    if (path.endsWith('/')) {
        // Path is a directory, return its name.
        path = path.substring(0, path.length - 1);
    }
    const slashIndex = path.lastIndexOf('/');
    return [path.substring(0, slashIndex), path.substring(slashIndex + 1, path.length)];
}

function Folder({folder, onFolderClick, sortData, selectedPaths, onFileClick, onSelect, disabled}) {
    // Creates a single table row for a folder, or a row for itself and indented rows for its children.
    let {path, children, is_empty} = folder;
    const ignored = useIsIgnoredDirectory(path);
    const pathWithNoTrailingSlash = path.substring(0, path.length - 1);
    const name = path.substring(pathWithNoTrailingSlash.lastIndexOf('/') + 1);
    const f = <TableRow key={path} disabled={disabled}>
        <TableCell collapsing>
            <Checkbox checked={selectedPaths.indexOf(folder['path']) >= 0} onChange={() => onSelect(folder['path'])}/>
        </TableCell>
        <TableCell onClick={() => onFolderClick(path)} className='file-path' colSpan={2} disabled={is_empty}>
            {depthIndentation(pathWithNoTrailingSlash)}
            {is_empty ? <Icon name='folder outline'/> : <Icon name='folder'/>}
            {ignored && <Icon name='eye slash' color='red'/>}
            {name}
        </TableCell>
    </TableRow>;
    if (children) {
        // Folder has children, recursively display them.
        children = sortData(children);
        let childPaths = [];
        _.forEach(children, (p, k) => {
            childPaths = [...childPaths,
                <InlineErrorBoundary key={k}>
                    <Path path={p} onFolderClick={onFolderClick} sortData={sortData} onFileClick={onFileClick}
                          selectedPaths={selectedPaths} onSelect={onSelect} disabled={disabled}/>
                </InlineErrorBoundary>];
        });
        return <React.Fragment>
            {f}
            {childPaths}
        </React.Fragment>
    } else {
        // Folder has no children.
        return f;
    }
}

function File({file, onFileClick, selectedPaths, onSelect, disabled}) {
    const {path, size} = file;
    return <TableRow key={path} disabled={disabled}>
        <TableCell collapsing>
            <Checkbox checked={selectedPaths.indexOf(path) >= 0} onChange={() => onSelect(path)}/>
        </TableCell>
        <TableCell onClick={() => onFileClick(file)} className='file-path'>
            {depthIndentation(path)}
            <FileRowTagIcon file={file}/>
            {/*null size to make icon the correct size*/}
            <FileIcon file={file} size={null}/>
            {pathName(path)}
        </TableCell>
        <TableCell collapsing textAlign='right'>
            {humanFileSize(size)}
        </TableCell>
    </TableRow>
}

function Path({path, onFolderClick, onFileClick, sortData, selectedPaths, onSelect, disabled}) {
    if (path['path'].endsWith('/')) {
        return <Folder
            folder={path}
            onFolderClick={onFolderClick}
            sortData={sortData}
            selectedPaths={selectedPaths}
            onSelect={onSelect}
            onFileClick={onFileClick}
            disabled={disabled}
        />
    } else {
        return <File
            file={path}
            onFileClick={onFileClick}
            selectedPaths={selectedPaths}
            onSelect={onSelect}
            disabled={disabled}
        />
    }
}

export function FileBrowser() {
    const [selectedPaths, setSelectedPaths] = React.useState([]);
    const [renameOpen, setRenameOpen] = React.useState(false);
    const [moveOpen, setMoveOpen] = React.useState(false);
    const [makeDirectoryOpen, setMakeDirectoryOpen] = React.useState(false);
    const [ignoreDirectoryOpen, setIgnoreDirectoryOpen] = React.useState(false);
    const [bulkTagOpen, setBulkTagOpen] = React.useState(false);
    const [uploadOpen, setUploadOpen] = React.useState(false);
    const [pending, setPending] = React.useState(false);
    // Only true if only one path is selected, and it is a directory.
    const [singleDirectorySelected, setSingleDirectorySelected] = React.useState(false);
    // Only true if single directory is selected, and it is in settings['ignored_directories']
    const [isDirectoryIgnored, setIsDirectoryIgnored] = React.useState(false);

    const {settings, fetchSettings} = React.useContext(SettingsContext);
    const {inverted} = React.useContext(ThemeContext);

    const selectedPathsCount = selectedPaths ? selectedPaths.length : 0;

    const {browseFiles, openFolders, setOpenFolders, fetchFiles} = useBrowseFiles();
    const wrolModeEnabled = useWROLMode();

    const headers = [
        {key: 'select', text: ''},
        {key: 'path', text: 'Path', sortBy: i => i['path'].toLowerCase()},
        {key: 'size', text: 'Size', sortBy: 'size'},
    ];

    const {setPreviewFile, setCallbacks} = React.useContext(FilePreviewContext);

    useEffect(() => {
        // Fetch files after tagging.
        setCallbacks([() => fetchFiles(openFolders)]);

        return () => setCallbacks(null);
    }, []);

    useEffect(() => {
        if (selectedPaths.length === 1 && selectedPaths[0].endsWith('/')) {
            setSingleDirectorySelected(true);
            if (!_.isEmpty(settings)) {
                // Used to toggle between ignore/un-ignore (eye/eye lash) icon.
                const directory = selectedPaths[0].slice(0, -1);
                setIsDirectoryIgnored(settings['ignored_directories'].indexOf(directory) >= 0);
            }
        } else {
            setSingleDirectorySelected(false);
        }
    }, [selectedPaths, settings]);

    const onIgnore = async () => {
        setIgnoreDirectoryOpen(false);
        await fetchSettings();
    }

    const onSelect = (path) => {
        let newSelectedPaths;
        // Select or deselect if the paths was previously selected.
        if (selectedPathsCount && selectedPaths.indexOf(path) >= 0) {
            newSelectedPaths = selectedPaths.filter(i => i !== path);
        } else {
            newSelectedPaths = [...selectedPaths, path];
        }
        setSelectedPaths(newSelectedPaths);
        console.debug('selectedPaths', newSelectedPaths);
    }

    const onDelete = async () => {
        await deleteFile(selectedPaths);
        await reset();
    };

    const handleMakeDirectory = async () => {
        setMakeDirectoryOpen(false);
        await reset();
    }

    const reset = async () => {
        setSelectedPaths([]);
        setPending(true);
        try {
            await fetchFiles();
        } finally {
            setPending(false);
        }
    }

    const footerClassName = `sticky-footer ${inverted}`;
    const footer = <div className={footerClassName}>
        <FilesRefreshButton paths={selectedPaths}/>
        <APIButton
            icon='trash'
            color='red'
            confirmContent='Are you sure you want to delete these files?'
            confirmButton='Delete'
            onClick={onDelete}
            disabled={selectedPathsCount === 0}
            obeyWROLMode={true}
        />
        <Button icon='text cursor'
                color='yellow'
                onClick={() => setRenameOpen(true)}
                disabled={wrolModeEnabled || selectedPathsCount !== 1}
        />
        {selectedPathsCount === 1 ?
            <RenameModal
                open={renameOpen}
                onClose={() => setRenameOpen(false)}
                onPending={setPending}
                path={selectedPaths[0]}
                onSubmit={reset}
            /> : null}
        <Button icon='move'
                color='teal'
                disabled={wrolModeEnabled || selectedPathsCount === 0}
                onClick={() => setMoveOpen(true)}
        />
        {selectedPathsCount > 0 ?
            <MoveModal open={moveOpen}
                       onClose={() => setMoveOpen(false)}
                       paths={selectedPaths}
                       onSubmit={reset}
            /> : null}
        <Button
            color='blue'
            onClick={() => setMakeDirectoryOpen(true)}
            disabled={wrolModeEnabled}
            style={{paddingLeft: '1em', paddingRight: '0.8em'}}
        >
            <IconGroup>
                <Icon name='folder'/>
                <Icon corner name='add'/>
            </IconGroup>
        </Button>
        <MakeDirectoryModal
            open={makeDirectoryOpen}
            onClose={() => setMakeDirectoryOpen(false)}
            parent={selectedPaths.length ? selectedPaths[0] : null}
            onSubmit={handleMakeDirectory}
        />
        <Button
            icon='upload'
            color='green'
            disabled={wrolModeEnabled || (selectedPathsCount > 0 && !singleDirectorySelected)}
            onClick={() => setUploadOpen(true)}
        />
        <FileBrowserUploadModal
            open={uploadOpen}
            onClose={() => setUploadOpen(false)}
            destination={singleDirectorySelected && selectedPaths[0] ? selectedPaths[0].slice(0, -1) : ''}
            onComplete={reset}
        />
        <Button
            color='grey'
            icon={isDirectoryIgnored ? 'eye' : 'eye slash'}
            disabled={!singleDirectorySelected || wrolModeEnabled}
            onClick={() => setIgnoreDirectoryOpen(true)}
        />
        <IgnoreDirectoryModal
            open={ignoreDirectoryOpen}
            onClose={onIgnore}
            onSubmit={onIgnore}
            directory={selectedPaths.length === 1 ? selectedPaths[0] : null}
            ignored={isDirectoryIgnored}
        />
        <Button
            color='violet'
            icon='tags'
            disabled={selectedPathsCount === 0}
            onClick={() => setBulkTagOpen(true)}
        />
        <BulkTagModal
            open={bulkTagOpen}
            onClose={() => setBulkTagOpen(false)}
            paths={selectedPaths}
            onComplete={reset}
        />
    </div>;

    const onFolderClick = async (folder) => {
        let newFolders;
        if (openFolders.indexOf(folder) >= 0) {
            // Remove the folder that was clicked on, as well as its sub-folders.
            newFolders = openFolders.filter(i => !i.startsWith(folder));
        } else {
            // Add the new folder to the opened folders.
            newFolders = [...openFolders, folder];
        }
        console.debug(`newFolders=${newFolders}`);
        setOpenFolders(newFolders);
    }

    if (browseFiles === null) {
        return <Placeholder>
            <PlaceholderLine/>
            <PlaceholderLine/>
        </Placeholder>;
    } else if (browseFiles === undefined) {
        return <ErrorMessage>Could not fetch files</ErrorMessage>
    }

    return <>
        <div style={{marginBottom: '4em'}}>
            <SortableTable
                tableProps={{unstackable: true}}
                data={browseFiles}
                tableHeaders={headers}
                defaultSortColumn='path'
                rowKey='path'
                rowFunc={(i, sortData) => <Path
                    key={i['key']}
                    path={i}
                    onFolderClick={onFolderClick}
                    onFileClick={(i) => setPreviewFile(i)}
                    sortData={sortData}
                    selectedPaths={selectedPaths}
                    onSelect={onSelect}
                    disabled={pending}
                />}
            />
        </div>
        {footer}
    </>
}

export function RenameModal({open, onClose, path, onSubmit, onPending}) {
    const [parent, name] = splitPathParentAndName(path);
    const [value, setValue] = React.useState(name);
    const disabled = value === name;

    const handleInputChange = (e, props) => {
        if (e) {
            e.preventDefault();
        }
        setValue(props.value);
    }

    const handleSubmit = async (e) => {
        if (e) {
            e.preventDefault();
        }
        try {
            console.log(`Renaming: ${path} to ${value}`);
            onPending(true);
            await renamePath(path, value);
        } finally {
            onClose();
            onPending(false);
            if (onSubmit) {
                await onSubmit();
            }
        }
    }

    useEffect(() => {
        setValue(pathName(path));
    }, [path]);

    return <Modal closeIcon
                  open={open}
                  onClose={onClose}
    >
        <Modal.Header>Rename: {name}</Modal.Header>
        <Modal.Content>
            <Form onSubmit={handleSubmit}>
                <Header as='h4'>New Name</Header>
                <pre>{parent ? parent + '/' : null}{value}</pre>

                <Input fluid
                       label='Name'
                       value={value}
                       onChange={handleInputChange}
                />
            </Form>
        </Modal.Content>
        <Modal.Actions>
            <Button
                color='violet'
                disabled={disabled}
                onClick={handleSubmit}
            >
                Rename
            </Button>
            <Button
                onClick={() => setValue(name)}
                floated='left'
            >
                Reset
            </Button>
        </Modal.Actions>
    </Modal>
}

export function MoveModal({open, paths, onClose, onSubmit}) {
    const [destination, setDestination] = React.useState('');
    const [pending, setPending] = React.useState(false);

    const handleDirectory = (value) => {
        setDestination(value);
    }

    const handleMove = async () => {
        try {
            setPending(true);
            await movePaths(destination, paths);
            onClose();
        } catch (e) {
            console.error(e);
            setPending(false);
        }
        if (onSubmit) {
            await onSubmit();
        }
    }

    const fileCell = i => <TableCell>
        <pre style={{marginTop: 0, marginBottom: 0}}>{i}</pre>
    </TableCell>;

    const destinationRows = paths.map(i => <TableRow key={i}>
        {fileCell(i)}
        {destination ? fileCell(destination + '/' + pathName(i)) : fileCell(pathName(i))}
    </TableRow>);

    return <Modal closeIcon
                  onClose={onClose}
                  open={open}
    >
        <Modal.Header>Move Files/Directories</Modal.Header>
        <Modal.Content>
            <p>Search for a directory to move your files into:</p>
            <DirectorySearch onSelect={handleDirectory} disabled={pending}/>

            <Table>
                <TableHeader>
                    <TableRow>
                        <TableHeaderCell>Source</TableHeaderCell>
                        <TableHeaderCell>Destination</TableHeaderCell>
                    </TableRow>
                </TableHeader>
                <TableBody>
                    {destinationRows}
                </TableBody>
            </Table>
        </Modal.Content>
        <Modal.Actions>
            <Button
                color='violet'
                onClick={handleMove}
                disabled={pending}
            >Move</Button>
            <Button
                onClick={() => setDestination(null)}
                floated='left'
                disabled={pending}
            >Reset</Button>
        </Modal.Actions>
    </Modal>
}

export function IgnoreDirectoryModal({open, onClose, onSubmit, directory, ignored}) {
    const mediaDirectory = useMediaDirectory();
    const [pending, setPending] = React.useState(false);

    const handleIgnore = async () => {
        try {
            setPending(true);
            if (ignored) {
                await unignoreDirectory(`${mediaDirectory}/${directory}`);
            } else {
                await ignoreDirectory(`${mediaDirectory}/${directory}`);
            }
            if (onSubmit) {
                onSubmit();
            }
        } finally {
            setPending(false);
        }
    }

    const header = ignored ? 'Remove Ignore Directory' : 'Ignore Directory';
    const content = ignored ?
        'Remove ignore of the following directory?  You must refresh your files after this.'
        : 'Ignore the following directory? The files within will not be indexed and will not show in search results.';
    let submitButton = <Button primary
                               disabled={pending}
                               onClick={handleIgnore}
    >{ignored ? 'Un-ignore' : 'Ignore'}</Button>;

    return <Modal closeIcon open={open} onClose={onClose}>
        <Modal.Header>{header}</Modal.Header>
        <Modal.Content>
            {content}
            <pre>{mediaDirectory}/{directory}</pre>
        </Modal.Content>
        <Modal.Actions>
            {submitButton}
            <Button secondary floated='left' onClick={onClose}>Close</Button>
        </Modal.Actions>
    </Modal>
}

export function MakeDirectoryModal({open, onClose, parent, onSubmit}) {
    const [value, setValue] = useState('');
    const mediaDirectory = useMediaDirectory();

    const handleInputChange = (e, props) => {
        if (e) {
            e.preventDefault();
        }
        setValue(props.value);
    }

    const handleSubmit = async (e) => {
        if (e) {
            e.preventDefault();
        }
        try {
            const path = parent ? `${parent}/${value}` : value;
            await makeDirectory(path);
            setValue('');
            if (onSubmit) {
                await onSubmit();
            }
        } catch (e) {
            console.error(e);
        }
    }

    return <Modal closeIcon open={open} onClose={onClose}>
        <Modal.Header>Make Directory</Modal.Header>
        <Modal.Content>
            <Form onSubmit={handleSubmit}>
                <pre>{mediaDirectory}/{parent}{value}</pre>
                <Input fluid
                       label='Name'
                       value={value}
                       onChange={handleInputChange}
                />
            </Form>
        </Modal.Content>
        <Modal.Actions>
            <Button color='violet' onClick={handleSubmit}>Create</Button>
        </Modal.Actions>
    </Modal>
}

export function FileBrowserUploadModal({open, onClose, destination, onComplete}) {
    const mediaDirectory = useMediaDirectory();
    const {t} = React.useContext(ThemeContext);

    const {
        setFiles,
        progresses,
        setDestination,
        doClear,
        tagsSelector,
        overwrite,
        setOverwrite,
        overallProgress,
        inProgress,
    } = useUploadFile();

    const onDrop = React.useCallback(async (acceptedFiles) => {
        if (acceptedFiles && acceptedFiles.length > 0) {
            setFiles(acceptedFiles);
        }
    }, [setFiles]);

    const {getRootProps, getInputProps} = useDropzone({onDrop, disabled: inProgress});

    // Set destination when modal opens or destination changes
    useEffect(() => {
        if (open) {
            setDestination(destination);
        }
    }, [open, destination, setDestination]);

    // Clear upload state when destination is cleared
    useEffect(() => {
        if (!destination && open) {
            doClear();
        }
    }, [destination, open, doClear]);

    const handleClose = () => {
        if (!inProgress) {
            doClear();
            onClose();
            if (onComplete) {
                onComplete();
            }
        }
    };

    let progressBars;
    if (!_.isEmpty(progresses)) {
        progressBars = Object.entries(progresses).map(([name, value]) => {
            const {percent, status, type} = value;
            let color = 'grey';
            let statusString;
            if (status === 'complete') {
                color = 'green';
                statusString = 'Complete:';
            } else if (status === 'pending') {
                statusString = 'Pending:';
            } else if (status === 'failed') {
                color = 'red';
                statusString = 'Failed:';
            } else if (status === 'conflicting') {
                color = 'orange';
                statusString = 'Already Exists:';
            }
            let indicating = status === 'pending';

            return <Grid.Row key={name}>
                <Grid.Column mobile={3} tablet={2} computer={1}>
                    <Icon name={mimetypeIconName(type, name.toLowerCase())} size='big'/>
                </Grid.Column>
                <Grid.Column mobile={13} tablet={14} computer={15}>
                    <Progress progress indicating={indicating} percent={percent} color={color}>
                        <p {...t}>{statusString} {name}</p>
                    </Progress>
                </Grid.Column>
            </Grid.Row>
        })
    }

    const displayPath = destination ? `${mediaDirectory}/${destination}` : mediaDirectory;

    return <Modal closeIcon open={open} onClose={handleClose} size='large'>
        <Modal.Header>Upload to: {displayPath}</Modal.Header>
        <Modal.Content>
            <Form>
                {tagsSelector}
                <div style={{marginTop: '1em'}}>
                <Toggle
                    checked={overwrite}
                    label='Overwrite existing files'
                    onChange={() => setOverwrite(!overwrite)}
                    disabled={inProgress}
                />
                </div>
            </Form>

            <Segment>
                <Grid columns={1}>
                    <Grid.Row>
                        <Grid.Column style={{padding: '1em'}}>
                            <Form>
                                <div {...getRootProps()}>
                                    <input {...getInputProps()}/>
                                    <Grid textAlign='center'>
                                        <Grid.Row>
                                            <Grid.Column>
                                                <Header icon>
                                                    <Icon name='file text'/>
                                                    Click here, or drop files here to upload
                                                </Header>
                                            </Grid.Column>
                                        </Grid.Row>
                                    </Grid>
                                </div>
                            </Form>
                        </Grid.Column>
                    </Grid.Row>
                </Grid>
            </Segment>

            <Grid>
                <Grid.Row columns={1}>
                    <Grid.Column>
                        {progresses && Object.keys(progresses).length > 1 && <Progress progress
                                                                                       percent={overallProgress}
                                                                                       color='blue'
                                                                                       label='Overall Progress'
                        />}
                    </Grid.Column>
                </Grid.Row>
            </Grid>
            <Grid columns={2}>
                {progressBars}
            </Grid>
        </Modal.Content>
        <Modal.Actions>
            <Button
                onClick={handleClose}
                disabled={inProgress}
            >
                Close
            </Button>
        </Modal.Actions>
    </Modal>
}