import * as base from './base.js';
import * as child_process from 'child_process';
import * as electron from 'electron';
import * as fs from 'fs';
import * as http from 'http';
import * as https from 'https';
import * as node from './node.js';
import * as os from 'os';
import * as path from 'path';
import * as url from 'url';
import * as view from './view.js';

const desktop = {};

desktop.Host = class {

    constructor() {
        this._document = window.document;
        this._window = window;
        this._global = global;
        this._telemetry = new base.Telemetry(this._window);
        process.on('uncaughtException', (error) => {
            this.exception(error, true);
            this.message(error.message);
        });
        this._global.eval = () => {
            throw new Error('eval.eval() not supported.');
        };
        this._window.eval = () => {
            throw new Error('window.eval() not supported.');
        };
        this._window.addEventListener('unload', () => {
            if (typeof __coverage__ !== 'undefined') {
                const dir = path.join(process.cwd(), 'dist', 'nyc', '.nyc_output');
                if (!fs.existsSync(dir)) {
                    fs.mkdirSync(dir, { recursive: true });
                }
                const base = path.basename(window.location.pathname, '.html');
                const file = path.join(dir, `${base}.json`);
                /* eslint-disable-next-line no-undef */
                fs.writeFileSync(file, JSON.stringify(__coverage__));
            }
        });
        this._environment = electron.ipcRenderer.sendSync('get-environment', {});
        this._environment.menu = this._environment.titlebar && this._environment.platform !== 'darwin';
        this._files = [];
        electron.ipcRenderer.on('open', (sender, data) => {
            this._open(data);
        });
        this._element('menu-button').style.opacity = 0;
        if (!/^\d+\.\d+\.\d+$/.test(this.version)) {
            throw new Error('Invalid version.');
        }
        const metadata = [];
        metadata.push(os.arch());
        let packager = '';
        if (process.platform === 'linux') {
            try {
                child_process.execFileSync('dpkg', ['-S', process.execPath]);
                packager = 'deb';
            } catch {
                try {
                    child_process.execFileSync("rpm", ["-qf", process.execPath]);
                    packager = 'rpm';
                } catch {
                    // continue regardless of error
                }
            }
        }
        metadata.push(packager);
        this._metadata = metadata.join('|');
    }

    get window() {
        return this._window;
    }

    get document() {
        return this._document;
    }

    get version() {
        return this._environment.version;
    }

    get type() {
        return 'Electron';
    }

    get metadata() {
        return this._metadata;
    }

    async view(view) {
        this._view = view;
        const age = async () => {
            const days = (new Date() - new Date(this._environment.date)) / (24 * 60 * 60 * 1000);
            if (days > 180) {
                this.document.body.classList.remove('spinner');
                const link = this._element('logo-github').href;
                for (;;) {
                    /* eslint-disable-next-line no-await-in-loop */
                    await this.message('Please update to the newest version.', null, 'Download');
                    this.openURL(link);
                }
            }
            return Promise.resolve();
        };
        const consent = async () => {
            const time = this.get('consent');
            if (!time || (Date.now() - time) > 30 * 24 * 60 * 60 * 1000) {
                let consent = true;
                try {
                    const content = await this._request('https://ipinfo.io/json', { 'Content-Type': 'application/json' }, 2000);
                    const json = JSON.parse(content);
                    const countries = ['AT', 'BE', 'BG', 'HR', 'CZ', 'CY', 'DK', 'EE', 'FI', 'FR', 'DE', 'EL', 'HU', 'IE', 'IT', 'LV', 'LT', 'LU', 'MT', 'NL', 'NO', 'PL', 'PT', 'SK', 'ES', 'SE', 'GB', 'UK', 'GR', 'EU', 'RO'];
                    if (json && json.country && countries.indexOf(json.country) === -1) {
                        consent = false;
                    }
                } catch {
                    // continue regardless of error
                }
                if (consent) {
                    this.document.body.classList.remove('spinner');
                    await this.message('This app uses cookies to report errors and anonymous usage information.', null, 'Accept');
                }
                this.set('consent', Date.now());
            }
        };
        const telemetry = async () => {
            if (this._environment.packaged) {
                const measurement_id = '848W2NVWVH';
                const user = this.get('user') || null;
                const session = this.get('session') || null;
                await this._telemetry.start(`G-${measurement_id}`, user && user.indexOf('.') !== -1 ? user : null, session);
                this._telemetry.send('page_view', {
                    app_name: this.type,
                    app_version: this.version,
                    app_metadata: this.metadata
                });
                this._telemetry.send('scroll', {
                    percent_scrolled: 90,
                    app_name: this.type,
                    app_version: this.version,
                    app_metadata: this.metadata
                });
                this.set('user', this._telemetry.get('client_id'));
                this.set('session', this._telemetry.session);
            }
        };
        await age();
        await consent();
        await telemetry();
    }

    async start() {
        if (this._files) {
            const files = this._files;
            delete this._files;
            if (files.length > 0) {
                const data = files.pop();
                this._open(data);
            }
        }
        this._window.addEventListener('focus', () => {
            this._document.body.classList.add('active');
        });
        this._window.addEventListener('blur', () => {
            this._document.body.classList.remove('active');
        });
        if (this._document.hasFocus()) {
            this._document.body.classList.add('active');
        }
        electron.ipcRenderer.on('recents', (sender, data) => {
            this._view.recents(data);
        });
        electron.ipcRenderer.on('export', (sender, data) => {
            this._view.export(data.file);
        });
        electron.ipcRenderer.on('cut', () => {
            this.document.execCommand('cut');
        });
        electron.ipcRenderer.on('copy', () => {
            this.document.execCommand('copy');
        });
        electron.ipcRenderer.on('paste', () => {
            if (this.document.queryCommandSupported('paste')) {
                this.document.execCommand('paste');
            } else if (this.document.queryCommandSupported('insertText')) {
                const content = electron.clipboard.readText();
                this.document.execCommand('insertText', false, content);
            }
        });
        electron.ipcRenderer.on('selectall', () => {
            this.document.execCommand('selectall');
        });
        electron.ipcRenderer.on('toggle', (sender, name) => {
            this._view.toggle(name);
            this.update({ ...this._view.options });
        });
        electron.ipcRenderer.on('zoom-in', () => {
            this._element('zoom-in-button').click();
        });
        electron.ipcRenderer.on('zoom-out', () => {
            this._element('zoom-out-button').click();
        });
        electron.ipcRenderer.on('zoom-reset', () => {
            this._view.resetZoom();
        });
        electron.ipcRenderer.on('show-properties', () => {
            this._element('sidebar-target-button').click();
        });
        electron.ipcRenderer.on('find', () => {
            this._view.find();
        });
        electron.ipcRenderer.on('about', () => {
            this._view.about();
        });
        this._element('titlebar-close').addEventListener('click', () => {
            electron.ipcRenderer.sendSync('window-close', {});
        });
        this._element('titlebar-toggle').addEventListener('click', () => {
            electron.ipcRenderer.sendSync('window-toggle', {});
        });
        this._element('titlebar-minimize').addEventListener('click', () => {
            electron.ipcRenderer.sendSync('window-minimize', {});
        });
        electron.ipcRenderer.on('window-state', (sender, data) => {
            if (this._environment.titlebar) {
                this._element('target').style.marginTop = '32px';
                this._element('target').style.height = 'calc(100% - 32px)';
                this._element('sidebar-title').style.marginTop = '24px';
                this._element('sidebar-closebutton').style.marginTop = '24px';
                this._element('titlebar').classList.add('titlebar-visible');
            }
            if (this._environment.titlebar && this._environment.platform !== 'darwin' && !data.fullscreen) {
                this._element('titlebar-control-box').classList.add('titlebar-control-box-visible');
            } else {
                this._element('titlebar-control-box').classList.remove('titlebar-control-box-visible');
            }
            this._element('menu-button').style.opacity = this._environment.menu ? 1 : 0;
            this._element('titlebar-maximize').style.opacity = data.maximized ? 0 : 1;
            this._element('titlebar-restore').style.opacity = data.maximized ? 1 : 0;
            this._element('titlebar-toggle').setAttribute('title', data.maximized ? 'Restore' : 'Maximize');
        });
        electron.ipcRenderer.sendSync('update-window-state', {});
        const openFileButton = this._element('open-file-button');
        if (openFileButton) {
            openFileButton.addEventListener('click', async () => {
                await this.execute('open');
            });
        }
        this.document.addEventListener('dragover', (e) => {
            e.preventDefault();
        });
        this.document.addEventListener('drop', (e) => {
            e.preventDefault();
        });
        this.document.body.addEventListener('drop', (e) => {
            e.preventDefault();
            const files = Array.from(e.dataTransfer.files);
            const paths = files.map((file) => electron.webUtils.getPathForFile(file));
            if (paths.length > 0) {
                electron.ipcRenderer.send('drop-paths', { paths });
            }
            return false;
        });
        this._view.show('welcome');
    }

    environment(name) {
        return this._environment[name];
    }

    async error(message) {
        await this.message(message, true, 'OK');
    }

    async require(id) {
        return import(`${id}.js`);
    }

    worker(id) {
        return new this.window.Worker(`${id}.js`, { type: 'module' });
    }

    async save(name, extension, defaultPath) {
        return new Promise((resolve, reject) => {
            electron.ipcRenderer.once('show-save-dialog-complete', (event, data) => {
                if (data.error) {
                    reject(new Error(data.error));
                } else if (data.canceled) {
                    resolve(null);
                } else {
                    resolve(data.filePath);
                }
            });
            electron.ipcRenderer.send('show-save-dialog', {
                title: 'Export Tensor',
                defaultPath,
                buttonLabel: 'Export',
                filters: [{ name, extensions: [extension] }]
            });
        });
    }

    async export(file, blob) {
        const window = this.window;
        const reader = new window.FileReader();
        reader.onload = (e) => {
            const data = new Uint8Array(e.target.result);
            fs.writeFile(file, data, null, async (error) => {
                if (error) {
                    await this._view.error(error, 'Error writing file.');
                }
            });
        };
        let error = null;
        if (!blob) {
            error = new Error(`Export blob is '${JSON.stringify(blob)}'.`);
        } else if (blob instanceof window.Blob === false) {
            error = new Error(`Export blob type is '${typeof blob}'.`);
        }
        if (error) {
            await this._view.error(error, 'Error exporting image.');
        } else {
            reader.readAsArrayBuffer(blob);
        }
    }

    async execute(name, value) {
        return new Promise((resolve, reject) => {
            electron.ipcRenderer.once('execute-complete', (event, data) => {
                if (data.error) {
                    reject(new Error(data.error));
                } else {
                    resolve(data.value);
                }
            });
            electron.ipcRenderer.send('execute', { name, value });
        });
    }

    async request(file, encoding, basename) {
        return new Promise((resolve, reject) => {
            const dirname = path.dirname(url.fileURLToPath(import.meta.url));
            const pathname = path.join(basename || dirname, file);
            fs.stat(pathname, (err, stat) => {
                if (err && err.code === 'ENOENT') {
                    reject(new Error(`The file '${file}' does not exist.`));
                } else if (err) {
                    reject(err);
                } else if (!stat.isFile()) {
                    reject(new Error(`The path '${file}' is not a file.`));
                } else if (stat && stat.size < 0x40000000) {
                    fs.readFile(pathname, encoding, (err, data) => {
                        if (err) {
                            reject(err);
                        } else {
                            resolve(encoding ? data : new base.BinaryStream(data));
                        }
                    });
                } else if (encoding) {
                    reject(new Error(`The file '${file}' size (${stat.size.toString()}) for encoding '${encoding}' is greater than 2 GB.`));
                } else {
                    const stream = new node.FileStream(pathname, 0, stat.size, stat.mtimeMs);
                    resolve(stream);
                }
            });
        });
    }

    openURL(url) {
        electron.shell.openExternal(url);
    }

    exception(error, fatal) {
        if (this._telemetry && error) {
            try {
                const name = error.name ? `${error.name}: ` : '';
                const message = error.message ? error.message : JSON.stringify(error);
                let context = '';
                let stack = '';
                if (error.stack) {
                    const format = (file, line, column) => {
                        return `${file.split('\\').join('/').split('/').pop()}:${line}:${column}`;
                    };
                    const match = error.stack.match(/\n {4}at (.*) \((.*):(\d*):(\d*)\)/);
                    if (match) {
                        stack = `${match[1]} (${format(match[2], match[3], match[4])})`;
                    } else {
                        const match = error.stack.match(/\n {4}at (.*):(\d*):(\d*)/);
                        if (match) {
                            stack = `(${format(match[1], match[2], match[3])})`;
                        } else {
                            const match = error.stack.match(/.*\n\s*(.*)\s*/);
                            if (match) {
                                [, stack] = match;
                            }
                        }
                    }
                }
                if (error.context) {
                    context = typeof error.context === 'string' ? error.context : JSON.stringify(error.context);
                }
                this._telemetry.send('exception', {
                    app_name: this.type,
                    app_version: this.version,
                    app_metadata: this.metadata,
                    error_name: name,
                    error_message: message,
                    error_context: context,
                    error_stack: stack,
                    error_fatal: fatal ? true : false
                });
            } catch {
                // continue regardless of error
            }
        }
    }

    event(name, params) {
        if (name && params) {
            params.app_name = this.type;
            params.app_version = this.version;
            params.app_metadata = this.metadata;
            this._telemetry.send(name, params);
        }
    }

    async _context(location) {
        const basename = path.basename(location);
        const stat = fs.statSync(location);
        if (stat.isFile()) {
            const dirname = path.dirname(location);
            const stream = await this.request(basename, null, dirname);
            return new desktop.Context(this, dirname, basename, stream);
        } else if (stat.isDirectory()) {
            const entries = new Map();
            const walk = (dir) => {
                for (const item of fs.readdirSync(dir)) {
                    const pathname = path.join(dir, item);
                    const stat = fs.statSync(pathname);
                    if (stat.isDirectory()) {
                        walk(pathname);
                    } else if (stat.isFile()) {
                        const stream = new node.FileStream(pathname, 0, stat.size, stat.mtimeMs);
                        const name = pathname.split(path.sep).join(path.posix.sep);
                        entries.set(name, stream);
                    }
                }
            };
            walk(location);
            return new desktop.Context(this, location, basename, null, entries);
        }
        throw new Error(`Unsupported path stat '${JSON.stringify(stat)}'.`);
    }

    async _open(location) {
        if (this._files) {
            this._files.push(location);
            return;
        }
        const path = location.path;
        const stat = fs.existsSync(path) ? fs.statSync(path) : null;
        const size = stat && stat.isFile() ? stat.size : 0;
        if (path && this._view.accept(path, size)) {
            this._view.show('welcome spinner');
            let context = null;
            try {
                context = await this._context(path);
                this._telemetry.set('session_engaged', 1);
            } catch (error) {
                await this._view.error(error, 'Error while reading file.');
                this.update({ path: null });
                return;
            }
            try {
                const attachment = await this._view.attach(context);
                if (attachment) {
                    this._view.show(null);
                } else {
                    const model = await this._view.open(context);
                    this._view.show(null);
                    const options = { ...this._view.options };
                    if (model) {
                        options.path = path;
                        this._title(location.label);
                    } else {
                        options.path = path;
                        this._title('');
                    }
                    electron.ipcRenderer.send('update-recents', { path });
                    this.update(options);
                }
            } catch (error) {
                const options = { ...this._view.options };
                if (error) {
                    await this._view.error(error);
                }
                this.update(options);
            }
        }
    }

    _request(location, headers, timeout) {
        const window = this.window;
        return new Promise((resolve, reject) => {
            const url = new window.URL(location);
            const protocol = url.protocol === 'https:' ? https : http;
            const options = {};
            options.headers = headers;
            if (timeout) {
                options.timeout = timeout;
            }
            const request = protocol.request(location, options, (response) => {
                if (response.statusCode === 200) {
                    let data = '';
                    response.on('data', (chunk) => {
                        data += chunk;
                    });
                    response.on('error', (err) => {
                        reject(err);
                    });
                    response.on('end', () => {
                        resolve(data);
                    });
                } else {
                    const error = new Error(`The web request failed with status code '${response.statusCode}'.`);
                    error.context = location;
                    reject(error);
                }
            });
            request.on("error", (err) => {
                reject(err);
            });
            request.on("timeout", () => {
                request.destroy();
                const error = new Error('The web request timed out.');
                error.context = url;
                reject(error);
            });
            request.end();
        });
    }

    get(name) {
        try {
            return electron.ipcRenderer.sendSync('get-configuration', { name });
        } catch {
            // continue regardless of error
        }
        return undefined;
    }

    set(name, value) {
        try {
            electron.ipcRenderer.sendSync('set-configuration', { name, value });
        } catch {
            // continue regardless of error
        }
    }

    delete(name) {
        try {
            electron.ipcRenderer.sendSync('delete-configuration', { name });
        } catch {
            // continue regardless of error
        }
    }

    _title(label) {
        const element = this._element('titlebar-content-text');
        if (element) {
            element.innerHTML = '';
            if (label) {
                const path = label.split(this._environment.separator || '/');
                for (let i = 0; i < path.length; i++) {
                    const span = this.document.createElement('span');
                    span.innerHTML = ` ${path[i]} ${i === path.length - 1 ? '' : '<svg class="titlebar-icon" aria-hidden="true"><use xlink:href="#icon-arrow-right"></use></svg>'}`;
                    element.appendChild(span);
                }
            }
        }
    }

    _element(id) {
        return this.document.getElementById(id);
    }

    update(data) {
        electron.ipcRenderer.send('window-update', data);
    }

    async message(message, alert, action) {
        return new Promise((resolve) => {
            const type = this.document.body.getAttribute('class');
            this._element('message-text').innerText = message || '';
            const button = this._element('message-button');
            if (action) {
                button.style.removeProperty('display');
                button.innerText = action;
                button.onclick = () => {
                    button.onclick = null;
                    this.document.body.setAttribute('class', type);
                    resolve(0);
                };
            } else {
                button.style.display = 'none';
                button.onclick = null;
            }
            if (alert) {
                this.document.body.setAttribute('class', 'alert');
            } else {
                this.document.body.classList.add('notification');
                this.document.body.classList.remove('default');
            }
            if (action) {
                button.focus();
            }
        });
    }
};

desktop.Context = class {

    constructor(host, folder, identifier, stream, entries) {
        this._host = host;
        this._folder = folder;
        this._identifier = identifier;
        this._stream = stream;
        this._entries = entries || new Map();
    }

    get identifier() {
        return this._identifier;
    }

    get stream() {
        return this._stream;
    }

    get entries() {
        return this._entries;
    }

    async request(file, encoding, base) {
        return this._host.request(file, encoding, base === undefined ? this._folder : base);
    }

    async require(id) {
        return this._host.require(id);
    }

    error(error, fatal) {
        this._host.exception(error, fatal);
    }
};

if (typeof window !== 'undefined') {
    window.addEventListener('load', () => {
        const value = new desktop.Host();
        window.__view__ = new view.View(value);
        window.__view__.start();
    });
}