import * as Sentry from '@sentry/ember';
import Component from '@glimmer/component';
import React, {Suspense} from 'react';
import ghostPaths from 'ghost-admin/utils/ghost-paths';
import {action} from '@ember/object';
import {inject} from 'ghost-admin/decorators/inject';
import {inject as service} from '@ember/service';

export const fileTypes = {
    image: {
        mimeTypes: ['image/gif', 'image/jpg', 'image/jpeg', 'image/png', 'image/svg+xml', 'image/webp'],
        extensions: ['gif', 'jpg', 'jpeg', 'png', 'svg', 'svgz', 'webp'],
        endpoint: '/images/upload/',
        resourceName: 'images'
    },
    video: {
        mimeTypes: ['video/mp4', 'video/webm', 'video/ogg'],
        extensions: ['mp4', 'webm', 'ogv'],
        endpoint: '/media/upload/',
        resourceName: 'media'
    },
    audio: {
        mimeTypes: ['audio/mp3', 'audio/mpeg', 'audio/ogg', 'audio/wav', 'audio/vnd.wav', 'audio/wave', 'audio/x-wav', 'audio/mp4', 'audio/x-m4a'],
        extensions: ['mp3', 'wav', 'ogg', 'm4a'],
        endpoint: '/media/upload/',
        resourceName: 'media'
    },
    mediaThumbnail: {
        mimeTypes: ['image/gif', 'image/jpg', 'image/jpeg', 'image/png', 'image/webp'],
        extensions: ['gif', 'jpg', 'jpeg', 'png', 'webp'],
        endpoint: '/media/thumbnail/upload/',
        requestMethod: 'put',
        resourceName: 'media'
    }
};

class ErrorHandler extends React.Component {
    state = {
        hasError: false
    };

    static getDerivedStateFromError() {
        return {hasError: true};
    }

    render() {
        if (this.state.hasError) {
            return (
                <p className="koenig-react-editor-error">Loading has failed. Try refreshing the browser!</p>
            );
        }

        return this.props.children;
    }
}

const fetchKoenig = function () {
    let status = 'pending';
    let response;

    const fetchPackage = async () => {
        if (window['@tryghost/koenig-lexical']) {
            return window['@tryghost/koenig-lexical'];
        }

        // the manual specification of the protocol in the import template string is
        // required to work around ember-auto-import complaining about an unknown dynamic import
        // during the build step
        const GhostAdmin = window.GhostAdmin || window.Ember.Namespace.NAMESPACES.find(ns => ns.name === 'ghost-admin');
        const urlTemplate = GhostAdmin.__container__.lookup('config:main').editor?.url;
        const urlVersion = GhostAdmin.__container__.lookup('config:main').editor?.version;

        const url = new URL(urlTemplate.replace('{version}', urlVersion));

        if (url.protocol === 'http:') {
            await import(`http://${url.host}${url.pathname}`);
        } else {
            await import(`https://${url.host}${url.pathname}`);
        }

        return window['@tryghost/koenig-lexical'];
    };

    const suspender = fetchPackage().then(
        (res) => {
            status = 'success';
            response = res;
        },
        (err) => {
            status = 'error';
            response = err;
        }
    );

    const read = () => {
        switch (status) {
        case 'pending':
            throw suspender;
        case 'error':
            throw response;
        default:
            return response;
        }
    };

    return {read};
};

const editorResource = fetchKoenig();

const KoenigComposer = (props) => {
    const {KoenigComposer: _KoenigComposer} = editorResource.read();
    return <_KoenigComposer {...props} />;
};

const KoenigEditor = (props) => {
    const {KoenigEditor: _KoenigEditor} = editorResource.read();
    return <_KoenigEditor {...props} />;
};

export default class KoenigLexicalEditor extends Component {
    @service ajax;

    @inject config;

    @action
    onError(error) {
        // ensure we're still showing errors in development
        console.error(error); // eslint-disable-line

        if (this.config.sentry_dsn) {
            Sentry.captureException(error, {
                tags: {
                    lexical: true
                }
            });
        }

        // don't rethrow, Lexical will attempt to gracefully recover
    }

    ReactComponent = () => {
        const cardConfig = {
            unsplash: {
                defaultHeaders: {
                    Authorization: `Client-ID 8672af113b0a8573edae3aa3713886265d9bb741d707f6c01a486cde8c278980`,
                    'Accept-Version': 'v1',
                    'Content-Type': 'application/json',
                    'App-Pragma': 'no-cache',
                    'X-Unsplash-Cache': true
                }
            }
        };

        const useFileUpload = (type = 'image') => {
            const [progress, setProgress] = React.useState(0);
            const [isLoading, setLoading] = React.useState(false);
            const [errors, setErrors] = React.useState([]);
            const [filesNumber, setFilesNumber] = React.useState(0);

            const progressTracker = React.useRef(new Map());

            function updateProgress() {
                if (progressTracker.current.size === 0) {
                    setProgress(0);
                    return;
                }

                let totalProgress = 0;

                progressTracker.current.forEach(value => totalProgress += value);

                setProgress(Math.round(totalProgress / progressTracker.current.size));
            }

            // we only check the file extension by default because IE doesn't always
            // expose the mime-type, we'll rely on the API for final validation
            function defaultValidator(file) {
                let extensions = fileTypes[type].extensions;
                let [, extension] = (/(?:\.([^.]+))?$/).exec(file.name);

                // if extensions is falsy exit early and accept all files
                if (!extensions) {
                    return true;
                }

                if (!Array.isArray(extensions)) {
                    extensions = extensions.split(',');
                }

                if (!extension || extensions.indexOf(extension.toLowerCase()) === -1) {
                    let validExtensions = `.${extensions.join(', .').toUpperCase()}`;
                    return `The file type you uploaded is not supported. Please use ${validExtensions}`;
                }

                return true;
            }

            const validate = (files = []) => {
                const validationResult = [];

                for (let i = 0; i < files.length; i += 1) {
                    let file = files[i];
                    let result = defaultValidator(file);
                    if (result === true) {
                        continue;
                    }

                    validationResult.push({fileName: file.name, message: result});
                }

                return validationResult;
            };

            const _uploadFile = async (file, {formData = {}} = {}) => {
                progressTracker.current[file] = 0;

                const fileFormData = new FormData();
                fileFormData.append('file', file, file.name);

                Object.keys(formData || {}).forEach((key) => {
                    fileFormData.append(key, formData[key]);
                });

                const url = `${ghostPaths().apiRoot}${fileTypes[type].endpoint}`;

                try {
                    const requestMethod = fileTypes[type].requestMethod || 'post';
                    const response = await this.ajax[requestMethod](url, {
                        data: fileFormData,
                        processData: false,
                        contentType: false,
                        dataType: 'text',
                        xhr: () => {
                            const xhr = new window.XMLHttpRequest();

                            xhr.upload.addEventListener('progress', (event) => {
                                if (event.lengthComputable) {
                                    progressTracker.current.set(file, (event.loaded / event.total) * 100);
                                    updateProgress();
                                }
                            }, false);

                            return xhr;
                        }
                    });

                    // force tracker progress to 100% in case we didn't get a final event
                    progressTracker.current.set(file, 100);
                    updateProgress();

                    let uploadResponse;
                    let responseUrl;

                    try {
                        uploadResponse = JSON.parse(response);
                    } catch (error) {
                        if (!(error instanceof SyntaxError)) {
                            throw error;
                        }
                    }

                    if (uploadResponse) {
                        const resource = uploadResponse[fileTypes[type].resourceName];
                        if (resource && Array.isArray(resource) && resource[0]) {
                            responseUrl = resource[0].url;
                        }
                    }

                    return {
                        url: responseUrl,
                        fileName: file.name
                    };
                } catch (error) {
                    console.error(error); // eslint-disable-line

                    // grab custom error message if present
                    let message = error.payload?.errors?.[0]?.message || '';
                    let context = error.payload?.errors?.[0]?.context || '';

                    // fall back to EmberData/ember-ajax default message for error type
                    if (!message) {
                        message = error.message;
                    }

                    const errorResult = {
                        message,
                        context,
                        fileName: file.name
                    };

                    // TODO: check for or expose known error types?
                    setErrors([...errors, errorResult]);
                }
            };

            const upload = async (files = [], options = {}) => {
                setFilesNumber(files.length);
                setLoading(true);

                const validationResult = validate(files);

                if (validationResult.length) {
                    setErrors(validationResult);
                    setLoading(false);
                    setProgress(100);

                    return null;
                }

                const uploadPromises = [];

                for (let i = 0; i < files.length; i += 1) {
                    const file = files[i];
                    uploadPromises.push(_uploadFile(file, options));
                }

                try {
                    const uploadResult = await Promise.all(uploadPromises);
                    setProgress(100);
                    progressTracker.current.clear();

                    setLoading(false);

                    setErrors([]); // components expect array of objects: { fileName: string, message: string }[]

                    return uploadResult;
                } catch (error) {
                    console.error(error); // eslint-disable-line no-console

                    setErrors([...errors, {message: error.message}]);
                    setLoading(false);
                    setProgress(100);
                    progressTracker.current.clear();

                    return null;
                }
            };

            return {progress, isLoading, upload, errors, filesNumber};
        };

        return (
            <div className={['koenig-react-editor', this.args.className].filter(Boolean).join(' ')}>
                <ErrorHandler>
                    <Suspense fallback={<p className="koenig-react-editor-loading">Loading editor...</p>}>
                        <KoenigComposer
                            cardConfig={cardConfig}
                            initialEditorState={this.args.lexical}
                            onError={this.onError}
                            fileUploader={{useFileUpload, fileTypes}}
                        >
                            <KoenigEditor
                                onChange={this.args.onChange}
                                registerAPI={this.args.registerAPI}
                                cursorDidExitAtTop={this.args.cursorDidExitAtTop}
                            />
                        </KoenigComposer>
                    </Suspense>
                </ErrorHandler>
            </div>
        );
    };
}