Add info page (#1102)

* Add api.getAnkiConnectVersion

* Enable basic functionality when certain features/elements aren't present

* Add info page

* Update information links

* Update info link on the settings v2 page

5 files changed, 163 insertions, 12 deletions

diff --git a/ext/bg/js/anki.js b/ext/bg/js/anki.js
index 8395518f..8693bc9a 100644
--- a/ext/bg/js/anki.js
+++ b/ext/bg/js/anki.js
@@ -49,6 +49,12 @@ class AnkiConnect {
         }
     }
 
+    async getVersion() {
+        if (!this._enabled) { return null; }
+        await this._checkVersion();
+        return await this._invoke('version', {});
+    }
+
     async addNote(note) {
         if (!this._enabled) { return null; }
         await this._checkVersion();
diff --git a/ext/bg/js/backend.js b/ext/bg/js/backend.js
index 012036dc..b2ea3cd6 100644
--- a/ext/bg/js/backend.js
+++ b/ext/bg/js/backend.js
@@ -90,6 +90,7 @@ class Backend {
             ['kanjiFind',                    {async: true,  contentScript: true,  handler: this._onApiKanjiFind.bind(this)}],
             ['termsFind',                    {async: true,  contentScript: true,  handler: this._onApiTermsFind.bind(this)}],
             ['textParse',                    {async: true,  contentScript: true,  handler: this._onApiTextParse.bind(this)}],
+            ['getAnkiConnectVersion',        {async: true,  contentScript: true,  handler: this._onApGetAnkiConnectVersion.bind(this)}],
             ['isAnkiConnected',              {async: true,  contentScript: true,  handler: this._onApiIsAnkiConnected.bind(this)}],
             ['addAnkiNote',                  {async: true,  contentScript: true,  handler: this._onApiAddAnkiNote.bind(this)}],
             ['getAnkiNoteInfo',              {async: true,  contentScript: true,  handler: this._onApiGetAnkiNoteInfo.bind(this)}],
@@ -428,6 +429,10 @@ class Backend {
         return results;
     }
 
+    async _onApGetAnkiConnectVersion() {
+        return await this._anki.getVersion();
+    }
+
     async _onApiIsAnkiConnected() {
         return await this._anki.isConnected();
     }
@@ -786,7 +791,8 @@ class Backend {
     }
 
     _onCommandHelp() {
-        chrome.tabs.create({url: 'https://foosoft.net/projects/yomichan/'});
+        const url = chrome.runtime.getURL('/bg/info.html');
+        chrome.tabs.create({url});
     }
 
     _onCommandOptions(params) {
diff --git a/ext/bg/js/context-main.js b/ext/bg/js/context-main.js
index b6736fd8..96b54a99 100644
--- a/ext/bg/js/context-main.js
+++ b/ext/bg/js/context-main.js
@@ -30,7 +30,7 @@ class DisplayController {
         this._showExtensionInfo(manifest);
         this._setupEnvironment();
         this._setupButtonEvents('.action-open-search', 'search', chrome.runtime.getURL('/bg/search.html'));
-        this._setupButtonEvents('.action-open-help', 'help', 'https://foosoft.net/projects/yomichan/');
+        this._setupButtonEvents('.action-open-help', 'help', chrome.runtime.getURL('/bg/info.html'));
 
         const optionsFull = await api.optionsGetFull();
         this._optionsFull = optionsFull;
diff --git a/ext/bg/js/info-main.js b/ext/bg/js/info-main.js
new file mode 100644
index 00000000..04455a4f
--- /dev/null
+++ b/ext/bg/js/info-main.js
@@ -0,0 +1,123 @@
+/*
+ * Copyright (C) 2020  Yomichan Authors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+/* global
+ * BackupController
+ * SettingsController
+ * api
+ */
+
+function getBrowserDisplayName(browser) {
+    switch (browser) {
+        case 'chrome': return 'Chrome';
+        case 'firefox': return 'Firefox';
+        case 'firefox-mobile': return 'Firefox for Android';
+        case 'edge': return 'Edge';
+        case 'edge-legacy': return 'Edge Legacy';
+        default: return `${browser}`;
+    }
+}
+
+function getOperatingSystemDisplayName(os) {
+    switch (os) {
+        case 'mac': return 'Mac OS';
+        case 'win': return 'Windows';
+        case 'android': return 'Android';
+        case 'cros': return 'Chrome OS';
+        case 'linux': return 'Linux';
+        case 'openbsd': return 'Open BSD';
+        case 'unknown': return 'Unknown';
+        default: return `${os}`;
+    }
+}
+
+(async () => {
+    try {
+        document.querySelector('#content-scroll-focus').focus();
+
+        const manifest = chrome.runtime.getManifest();
+
+        api.forwardLogsToBackend();
+        await yomichan.prepare();
+
+        const {userAgent} = navigator;
+        const {version} = manifest;
+        const {browser, platform: {os}} = await api.getEnvironmentInfo();
+
+        const thisVersionLink = document.querySelector('#release-notes-this-version-link');
+        thisVersionLink.href = thisVersionLink.dataset.hrefFormat.replace(/\{version\}/g, version);
+
+        document.querySelector('#version').textContent = `${version}`;
+        document.querySelector('#browser').textContent = getBrowserDisplayName(browser);
+        document.querySelector('#platform').textContent = getOperatingSystemDisplayName(os);
+        document.querySelector('#user-agent').textContent = userAgent;
+
+        (async () => {
+            let ankiConnectVersion = null;
+            try {
+                ankiConnectVersion = await api.getAnkiConnectVersion();
+            } catch (e) {
+                // NOP
+            }
+
+            document.querySelector('#anki-connect-version').textContent = (ankiConnectVersion !== null ? `${ankiConnectVersion}` : 'Unknown');
+            document.querySelector('#anki-connect-version-container').hasError = `${ankiConnectVersion === null}`;
+            document.querySelector('#anki-connect-version-unknown-message').hidden = (ankiConnectVersion !== null);
+        })();
+
+        (async () => {
+            let dictionaryInfos;
+            try {
+                dictionaryInfos = await api.getDictionaryInfo();
+            } catch (e) {
+                return;
+            }
+
+            const fragment = document.createDocumentFragment();
+            let first = true;
+            for (const {title} of dictionaryInfos) {
+                if (first) {
+                    first = false;
+                } else {
+                    fragment.appendChild(document.createTextNode(', '));
+                }
+
+                const node = document.createElement('span');
+                node.className = 'installed-dictionary';
+                node.textContent = title;
+                fragment.appendChild(node);
+            }
+
+            document.querySelector('#installed-dictionaries-none').hidden = (dictionaryInfos.length !== 0);
+            const container = document.querySelector('#installed-dictionaries');
+            container.textContent = '';
+            container.appendChild(fragment);
+        })();
+
+        const settingsController = new SettingsController();
+        settingsController.prepare();
+
+        const backupController = new BackupController(settingsController, null);
+        await backupController.prepare();
+
+        await promiseTimeout(100);
+
+        document.documentElement.dataset.loaded = 'true';
+    } catch (e) {
+        yomichan.logError(e);
+    }
+})();
diff --git a/ext/bg/js/settings/backup-controller.js b/ext/bg/js/settings/backup-controller.js
index b37dd91d..50a145ff 100644
--- a/ext/bg/js/settings/backup-controller.js
+++ b/ext/bg/js/settings/backup-controller.js
@@ -31,25 +31,41 @@ class BackupController {
         this._settingsResetModal = null;
         this._settingsImportErrorModal = null;
         this._settingsImportWarningModal = null;
-        this._optionsUtil = new OptionsUtil();
+        this._optionsUtil = null;
+        try {
+            this._optionsUtil = new OptionsUtil();
+        } catch (e) {
+            // NOP
+        }
     }
 
     async prepare() {
-        await this._optionsUtil.prepare();
+        if (this._optionsUtil !== null) {
+            await this._optionsUtil.prepare();
+        }
 
-        this._settingsResetModal = this._modalController.getModal('settings-reset');
-        this._settingsImportErrorModal = this._modalController.getModal('settings-import-error');
-        this._settingsImportWarningModal = this._modalController.getModal('settings-import-warning');
+        if (this._modalController !== null) {
+            this._settingsResetModal = this._modalController.getModal('settings-reset');
+            this._settingsImportErrorModal = this._modalController.getModal('settings-import-error');
+            this._settingsImportWarningModal = this._modalController.getModal('settings-import-warning');
+        }
 
-        document.querySelector('#settings-export-button').addEventListener('click', this._onSettingsExportClick.bind(this), false);
-        document.querySelector('#settings-import-button').addEventListener('click', this._onSettingsImportClick.bind(this), false);
-        document.querySelector('#settings-import-file').addEventListener('change', this._onSettingsImportFileChange.bind(this), false);
-        document.querySelector('#settings-reset-button').addEventListener('click', this._onSettingsResetClick.bind(this), false);
-        document.querySelector('#settings-reset-confirm-button').addEventListener('click', this._onSettingsResetConfirmClick.bind(this), false);
+        this._addNodeEventListener('#settings-export-button', 'click', this._onSettingsExportClick.bind(this), false);
+        this._addNodeEventListener('#settings-import-button', 'click', this._onSettingsImportClick.bind(this), false);
+        this._addNodeEventListener('#settings-import-file', 'change', this._onSettingsImportFileChange.bind(this), false);
+        this._addNodeEventListener('#settings-reset-button', 'click', this._onSettingsResetClick.bind(this), false);
+        this._addNodeEventListener('#settings-reset-confirm-button', 'click', this._onSettingsResetConfirmClick.bind(this), false);
     }
 
     // Private
 
+    _addNodeEventListener(selector, ...args) {
+        const node = document.querySelector(selector);
+        if (node === null) { return; }
+
+        node.addEventListener(...args);
+    }
+
     _getSettingsExportDateString(date, dateSeparator, dateTimeSeparator, timeSeparator, resolution) {
         const values = [
             date.getUTCFullYear().toString(),