import ko from 'ko';
import { addObservablesTo, addComputablesTo, addSubscribablesTo } from 'External/ko';

import { Scope } from 'Common/Enums';

import {
	ComposeType,
	ClientSideKeyNameMessageHeaderFullInfo,
	ClientSideKeyNameMessageAttachmentControls,
	FolderType,
	MessageSetAction
} from 'Common/EnumsUser';

import {
	elementById,
	leftPanelDisabled,
	keyScopeReal,
	Settings,
	SettingsCapa,
	fireEvent,
	addShortcut,
	registerShortcut
} from 'Common/Globals';

import { arrayLength } from 'Common/Utils';
import { download, mailToHelper, showMessageComposer, moveAction } from 'Common/UtilsUser';
import { isFullscreen, exitFullscreen, toggleFullscreen } from 'Common/Fullscreen';

import { SMAudio } from 'Common/Audio';

import { i18n } from 'Common/Translator';
import { attachmentDownload } from 'Common/Links';

import { MessageFlagsCache } from 'Common/Cache';

import { AppUserStore } from 'Stores/User/App';
import { SettingsUserStore } from 'Stores/User/Settings';
import { AccountUserStore } from 'Stores/User/Account';
import { FolderUserStore, isAllowedKeyword } from 'Stores/User/Folder';
import { MessageUserStore } from 'Stores/User/Message';
import { MessagelistUserStore } from 'Stores/User/Messagelist';
import { ThemeStore } from 'Stores/Theme';

import * as Local from 'Storage/Client';

import Remote from 'Remote/User/Fetch';

import { decorateKoCommands } from 'Knoin/Knoin';
import { AbstractViewRight } from 'Knoin/AbstractViews';

import { PgpUserStore } from 'Stores/User/Pgp';

import { MimeToMessage } from 'Mime/Utils';

import { MessageModel } from 'Model/Message';

import { showScreenPopup } from 'Knoin/Knoin';
import { OpenPgpImportPopupView } from 'View/Popup/OpenPgpImport';
import { GnuPGUserStore } from 'Stores/User/GnuPG';
import { OpenPGPUserStore } from 'Stores/User/OpenPGP';

const
	oMessageScrollerDom = () => elementById('messageItem') || {},

	currentMessage = MessageUserStore.message,

	fetchRaw = url => rl.fetch(url).then(response => response.ok && response.text());

export class MailMessageView extends AbstractViewRight {
	constructor() {
		super();

		const
			/**
			 * @param {Function} fExecute
			 * @param {Function} fCanExecute = true
			 * @returns {Function}
			 */
			createCommand = (fExecute, fCanExecute) => {
				let fResult = () => {
						fCanExecute() && fExecute.call(null);
						return false;
					};
				fResult.canExecute = fCanExecute;
				return fResult;
			},

			createCommandReplyHelper = type =>
				createCommand(() => this.replyOrforward(type), this.canBeRepliedOrForwarded),

			createCommandActionHelper = (folderType, bDelete) =>
				createCommand(() => {
					const message = currentMessage();
					if (message) {
						currentMessage(null);
						rl.app.moveMessagesToFolderType(folderType, message.folder, [message.uid], bDelete);
					}
				}, this.messageVisibility);

		this.msgDefaultAction = SettingsUserStore.msgDefaultAction;
		this.simpleAttachmentsList = SettingsUserStore.simpleAttachmentsList;

		addObservablesTo(this, {
			showAttachmentControls: !!Local.get(ClientSideKeyNameMessageAttachmentControls),
			downloadAsZipLoading: false,
			showFullInfo: '1' === Local.get(ClientSideKeyNameMessageHeaderFullInfo),
			moreDropdownTrigger: false,

			// viewer
			viewFromShort: '',
			viewFromDkimData: ['none', ''],
			viewToShort: ''
		});

		this.moveAction = moveAction;

		this.allowMessageActions = SettingsCapa('MessageActions');

		const attachmentsActions = Settings.app('attachmentsActions');
		this.attachmentsActions = ko.observableArray(arrayLength(attachmentsActions) ? attachmentsActions : []);

		this.hasCheckedMessages = MessagelistUserStore.hasChecked;
		this.archiveAllowed = MessagelistUserStore.archiveAllowed;
		this.canMarkAsSpam = MessagelistUserStore.canMarkAsSpam;
		this.isDraftFolder = MessagelistUserStore.isDraftFolder;
		this.isSpamFolder = MessagelistUserStore.isSpamFolder;

		this.message = MessageUserStore.message;
		this.messageLoadingThrottle = MessageUserStore.loading;
		this.messagesBodiesDom = MessageUserStore.bodiesDom;
		this.messageError = MessageUserStore.error;

		this.fullScreenMode = isFullscreen;
		this.toggleFullScreen = toggleFullscreen;

		this.downloadAsZipError = ko.observable(false).extend({ falseTimeout: 7000 });

		this.messageDomFocused = ko.observable(false).extend({ rateLimit: 0 });

		// viewer
		this.viewHash = '';

		addComputablesTo(this, {
			allowAttachmentControls: () => arrayLength(attachmentsActions) && SettingsCapa('AttachmentsActions'),

			downloadAsZipAllowed: () => this.attachmentsActions.includes('zip')
				&& (currentMessage()?.attachments || [])
					.filter(item => item?.download /*&& !item?.isLinked()*/ && item?.checked())
					.length,

			tagsAllowed: () => FolderUserStore.currentFolder()?.tagsAllowed(),

			messageVisibility: () => !MessageUserStore.loading() && !!currentMessage(),

			canBeRepliedOrForwarded: () => !MessagelistUserStore.isDraftFolder() && this.messageVisibility(),

			viewFromDkimVisibility: () => 'none' !== this.viewFromDkimData()[0],

			viewFromDkimStatusIconClass:() => {
				switch (this.viewFromDkimData()[0]) {
					case 'none':
						return '';
					case 'pass':
						return 'icon-ok iconcolor-green'; // ✔️
					default:
						return 'icon-cross iconcolor-red'; // ✖ ❌
				}
			},

			viewFromDkimStatusTitle:() => {
				const status = this.viewFromDkimData();
				if (arrayLength(status) && status[0]) {
					return status[1] || 'DKIM: ' + status[0];
				}

				return '';
			},

			pgpSupported: () => currentMessage() && PgpUserStore.isSupported(),

			messageListOrViewLoading:
				() => MessagelistUserStore.isLoading() | MessageUserStore.loading()
		});

		addSubscribablesTo(this, {
			message: message => {
				if (message) {
					if (this.viewHash !== message.hash) {
						this.scrollMessageToTop();
					}
					this.viewHash = message.hash;
					// TODO: make first param a user setting #683
					this.viewFromShort(message.fromToLine(false, true));
					this.viewFromDkimData(message.fromDkimData());
					this.viewToShort(message.toToLine(true, true));
				} else {
					MessagelistUserStore.selectedMessage(null);

					this.viewHash = '';

					this.scrollMessageToTop();
				}
			},

			showFullInfo: value => Local.set(ClientSideKeyNameMessageHeaderFullInfo, value ? '1' : '0')
		});

		// commands
		this.replyCommand = createCommandReplyHelper(ComposeType.Reply);
		this.replyAllCommand = createCommandReplyHelper(ComposeType.ReplyAll);
		this.forwardCommand = createCommandReplyHelper(ComposeType.Forward);
		this.forwardAsAttachmentCommand = createCommandReplyHelper(ComposeType.ForwardAsAttachment);
		this.editAsNewCommand = createCommandReplyHelper(ComposeType.EditAsNew);

		this.deleteCommand = createCommandActionHelper(FolderType.Trash);
		this.deleteWithoutMoveCommand = createCommandActionHelper(FolderType.Trash, true);
		this.archiveCommand = createCommandActionHelper(FolderType.Archive);
		this.spamCommand = createCommandActionHelper(FolderType.Spam);
		this.notSpamCommand = createCommandActionHelper(FolderType.NotSpam);

		decorateKoCommands(this, {
			messageEditCommand: self => self.messageVisibility(),
			goUpCommand: self => !self.messageListOrViewLoading(),
			goDownCommand: self => !self.messageListOrViewLoading()
		});
	}

	closeMessage() {
		currentMessage(null);
	}

	messageEditCommand() {
		currentMessage() && showMessageComposer([ComposeType.Draft, currentMessage()]);
	}

	goUpCommand() {
		fireEvent('mailbox.message-list.selector.go-up',
			!!currentMessage() // bForceSelect
		);
	}

	goDownCommand() {
		fireEvent('mailbox.message-list.selector.go-down',
			!!currentMessage() // bForceSelect
		);
	}

	/**
	 * @param {string} sType
	 * @returns {void}
	 */
	replyOrforward(sType) {
		showMessageComposer([sType, currentMessage()]);
	}

	onBuild(dom) {
		const eqs = (ev, s) => ev.target.closestWithin(s, dom);
		dom.addEventListener('click', event => {
			ThemeStore.isMobile() && leftPanelDisabled(true);

			let el = eqs(event, 'a');
			if (el && 0 === event.button && mailToHelper(el.href)) {
				event.preventDefault();
				event.stopPropagation();
				return;
			}

			if (eqs(event, '.attachmentsPlace .showPreview')) {
				event.stopPropagation();
				return;
			}

			el = eqs(event, '.attachmentsPlace .showPreplay');
			if (el) {
				event.stopPropagation();
				const attachment = ko.dataFor(el);
				if (attachment && SMAudio.supported) {
					switch (true) {
						case SMAudio.supportedMp3 && attachment.isMp3():
							SMAudio.playMp3(attachment.linkDownload(), attachment.fileName);
							break;
						case SMAudio.supportedOgg && attachment.isOgg():
							SMAudio.playOgg(attachment.linkDownload(), attachment.fileName);
							break;
						case SMAudio.supportedWav && attachment.isWav():
							SMAudio.playWav(attachment.linkDownload(), attachment.fileName);
							break;
						// no default
					}
				}
				return;
			}

			el = eqs(event, '.attachmentItem');
			if (el) {
				const attachment = ko.dataFor(el), url = attachment?.linkDownload();
				if (url) {
					if ('application/pgp-keys' == attachment.mimeType
					 && (OpenPGPUserStore.isSupported() || GnuPGUserStore.isSupported())) {
						fetchRaw(url).then(text =>
							showScreenPopup(OpenPgpImportPopupView, [text])
						);
					} else if ('message/rfc822' == attachment.mimeType) {
						// TODO
						fetchRaw(url).then(text => {
							const oMessage = new MessageModel();
							MimeToMessage(text, oMessage);
							// cleanHTML
							oMessage.viewPopupMessage();
						});
					} else {
						download(url, attachment.fileName);
					}
				}
			}

			if (eqs(event, '.messageItemHeader .subjectParent .flagParent')) {
				const message = currentMessage();
				message && MessagelistUserStore.setAction(
					message.folder,
					message.isFlagged() ? MessageSetAction.UnsetFlag : MessageSetAction.SetFlag,
					[message]
				);
			}
		});

		AppUserStore.focusedState.subscribe(value => {
			if (Scope.MessageView !== value) {
				this.scrollMessageToTop();
				this.scrollMessageToLeft();
			}
		});

		keyScopeReal.subscribe(value => this.messageDomFocused(Scope.MessageView === value));

		// initShortcuts

		// exit fullscreen, back
		addShortcut('escape', '', Scope.MessageView, () => {
			if (!this.viewModelDom.hidden && currentMessage()) {
				const preview = SettingsUserStore.usePreviewPane();
				if (isFullscreen()) {
					exitFullscreen();
					if (preview) {
						AppUserStore.focusedState(Scope.MessageList);
					}
				} else if (!preview) {
					currentMessage(null);
				} else {
					AppUserStore.focusedState(Scope.MessageList);
				}

				return false;
			}
		});

		// fullscreen
		addShortcut('enter,open', '', Scope.MessageView, () => {
			isFullscreen() || toggleFullscreen();
			return false;
		});

		// reply
		registerShortcut('r,mailreply', '', [Scope.MessageList, Scope.MessageView], () => {
			if (currentMessage()) {
				this.replyCommand();
				return false;
			}
			return true;
		});

		// replyAll
		registerShortcut('a', '', [Scope.MessageList, Scope.MessageView], () => {
			if (currentMessage()) {
				this.replyAllCommand();
				return false;
			}
		});
		registerShortcut('mailreply', 'shift', [Scope.MessageList, Scope.MessageView], () => {
			if (currentMessage()) {
				this.replyAllCommand();
				return false;
			}
		});

		// forward
		registerShortcut('f,mailforward', '', [Scope.MessageList, Scope.MessageView], () => {
			if (currentMessage()) {
				this.forwardCommand();
				return false;
			}
		});

		// message information
		registerShortcut('i', 'meta', [Scope.MessageList, Scope.MessageView], () => {
			if (currentMessage()) {
				this.showFullInfo(!this.showFullInfo());
			}
			return false;
		});

		// toggle message blockquotes
		registerShortcut('b', '', [Scope.MessageList, Scope.MessageView], () => {
			const message = currentMessage();
			if (message?.body) {
				message.body.querySelectorAll('.sm-bq-switcher > summary').forEach(node => node.click());
				return false;
			}
		});

		addShortcut('arrowup,arrowleft', 'meta', [Scope.MessageList, Scope.MessageView], () => {
			this.goUpCommand();
			return false;
		});

		addShortcut('arrowdown,arrowright', 'meta', [Scope.MessageList, Scope.MessageView], () => {
			this.goDownCommand();
			return false;
		});

		// delete
		addShortcut('delete', '', Scope.MessageView, () => {
			this.deleteCommand();
			return false;
		});
		addShortcut('delete', 'shift', Scope.MessageView, () => {
			this.deleteWithoutMoveCommand();
			return false;
		});

		// change focused state
		addShortcut('arrowleft', '', Scope.MessageView, () => {
			if (!isFullscreen() && currentMessage() && SettingsUserStore.usePreviewPane()
			 && !oMessageScrollerDom().scrollLeft) {
				AppUserStore.focusedState(Scope.MessageList);
				return false;
			}
		});
		addShortcut('tab', 'shift', Scope.MessageView, () => {
			if (!isFullscreen() && currentMessage() && SettingsUserStore.usePreviewPane()) {
				AppUserStore.focusedState(Scope.MessageList);
			}
			return false;
		});
	}

	/**
	 * @returns {boolean}
	 */
	isDraftOrSentFolder() {
		return MessagelistUserStore.isDraftFolder() || MessagelistUserStore.isSentFolder();
	}

	scrollMessageToTop() {
		oMessageScrollerDom().scrollTop = (50 < oMessageScrollerDom().scrollTop) ? 50 : 0;
	}

	scrollMessageToLeft() {
		oMessageScrollerDom().scrollLeft = 0;
	}

	toggleAttachmentControls() {
		const b = !this.showAttachmentControls();
		this.showAttachmentControls(b);
		Local.set(ClientSideKeyNameMessageAttachmentControls, b);
	}

	downloadAsZip() {
		const hashes = (currentMessage()?.attachments || [])
			.map(item => item?.checked() /*&& !item?.isLinked()*/ ? item.download : '')
			.filter(v => v);
		if (hashes.length) {
			Remote.post('AttachmentsActions', this.downloadAsZipLoading, {
				Do: 'Zip',
				Hashes: hashes
			})
			.then(result => {
				let hash = result?.Result?.FileHash;
				if (hash) {
					download(attachmentDownload(hash), hash+'.zip');
				} else {
					this.downloadAsZipError(true);
				}
			})
			.catch(() => this.downloadAsZipError(true));
		}
	}

	/**
	 * @param {MessageModel} oMessage
	 * @returns {void}
	 */
	showImages() {
		currentMessage().showExternalImages();
	}

	/**
	 * @returns {string}
	 */
	printableCheckedMessageCount() {
		const cnt = MessagelistUserStore.listCheckedOrSelectedUidsWithSubMails().size;
		return 0 < cnt ? (100 > cnt ? cnt : '99+') : '';
	}

	/**
	 * @param {MessageModel} oMessage
	 * @returns {void}
	 */
	readReceipt() {
		let oMessage = currentMessage()
		if (oMessage.readReceipt()) {
			Remote.request('SendReadReceiptMessage', iError => {
				if (!iError) {
					oMessage.flags.push('$mdnsent');
//					oMessage.flags.valueHasMutated();
					MessageFlagsCache.store(oMessage);
					MessagelistUserStore.reloadFlagsAndCachedMessage();
				}
			}, {
				MessageFolder: oMessage.folder,
				MessageUid: oMessage.uid,
				ReadReceipt: oMessage.readReceipt(),
				subject: i18n('READ_RECEIPT/SUBJECT', { SUBJECT: oMessage.subject() }),
				Text: i18n('READ_RECEIPT/BODY', { 'READ-RECEIPT': AccountUserStore.email() })
			});
		}
	}

	newTag() {
		let message = currentMessage();
		if (message) {
			let keyword = prompt(i18n('MESSAGE/NEW_TAG'), '')?.replace(/[\s\\]+/g, '');
			if (keyword.length && isAllowedKeyword(keyword)) {
				message.toggleTag(keyword);
				FolderUserStore.currentFolder().permanentFlags.push(keyword);
			}
		}
	}

	pgpDecrypt() {
		const oMessage = currentMessage();
		PgpUserStore.decrypt(oMessage).then(result => {
			if (result) {
				oMessage.pgpDecrypted(true);
				if (result.data) {
					MimeToMessage(result.data, oMessage);
					oMessage.html() ? oMessage.viewHtml() : oMessage.viewPlain();
					if (result.signatures?.length) {
						oMessage.pgpSigned(true);
						oMessage.pgpVerified({
							signatures: result.signatures,
							success: !!result.signatures.length
						});
					}
				}
			} else {
				// TODO: translate
				alert('Decryption failed, canceled or not possible');
			}
		})
		.catch(e => console.error(e));
	}

	pgpVerify(/*self, event*/) {
		const oMessage = currentMessage()/*, ctrl = event.target.closest('.openpgp-control')*/;
		PgpUserStore.verify(oMessage).then(result => {
			if (result) {
				oMessage.pgpVerified(result);
			} else {
				alert('Verification failed or no valid public key found');
			}
/*
			if (result?.success) {
				i18n('OPENPGP/GOOD_SIGNATURE', {
					USER: validKey.user + ' (' + validKey.id + ')'
				});
				message.getText()
			} else {
				const keyIds = arrayLength(signingKeyIds) ? signingKeyIds : null,
					additional = keyIds
						? keyIds.map(item => item?.toHex?.()).filter(v => v).join(', ')
						: '';

				i18n('OPENPGP/ERROR', {
					ERROR: 'message'
				}) + (additional ? ' (' + additional + ')' : '');
			}
*/
		});
	}

}