import ko from 'ko';
import _ from '_';
import $ from '$';

import {i18n} from 'Common/Translator';
import {log, isArray, isNonEmptyArray, pString, isUnd, trim} from 'Common/Utils';

import AccountStore from 'Stores/User/Account';

import {showScreenPopup} from 'Knoin/Knoin';

class PgpUserStore
{
	constructor() {
		this.capaOpenPGP = ko.observable(false);

		this.openpgp = null;

		this.openpgpkeys = ko.observableArray([]);
		this.openpgpKeyring = null;

		this.openpgpkeysPublic = this.openpgpkeys.filter((item) => !!(item && !item.isPrivate));
		this.openpgpkeysPrivate = this.openpgpkeys.filter((item) => !!(item && item.isPrivate));
	}

	/**
	 * @returns {boolean}
	 */
	isSupported() {
		return !!this.openpgp;
	}

	findKeyByHex(keys, hash) {
		return _.find(keys, (item) => (hash && item && (hash === item.id || -1 < item.ids.indexOf(hash))));
	}

	findPublicKeyByHex(hash) {
		return this.findKeyByHex(this.openpgpkeysPublic(), hash);
	}

	findPrivateKeyByHex(hash) {
		return this.findKeyByHex(this.openpgpkeysPrivate(), hash);
	}

	findPublicKeysByEmail(email) {
		return _.compact(_.flatten(_.map(this.openpgpkeysPublic(), (item) => {
			const key = item && -1 < item.emails.indexOf(email) ? item : null;
			return key ? key.getNativeKeys() : [null];
		}), true));
	}

	findPublicKeysBySigningKeyIds(signingKeyIds) {
		return _.compact(_.flatten(_.map(signingKeyIds, (id) => {
			const key = id && id.toHex ? this.findPublicKeyByHex(id.toHex()) : null;
			return key ? key.getNativeKeys() : [null];
		}), true));
	}

	findPrivateKeysByEncryptionKeyIds(encryptionKeyIds, recipients, returnWrapKeys) {
		let
			result = isArray(encryptionKeyIds) ? _.compact(_.flatten(_.map(encryptionKeyIds, (id) => {
				const key = id && id.toHex ? this.findPrivateKeyByHex(id.toHex()) : null;
				return key ? (returnWrapKeys ? [key] : key.getNativeKeys()) : [null];
			}), true)) : [];

		if (0 === result.length && isNonEmptyArray(recipients))
		{
			result = _.uniq(_.compact(_.flatten(_.map(recipients, (sEmail) => {
				const keys = sEmail ? this.findAllPrivateKeysByEmailNotNative(sEmail) : null;
				return keys ? (returnWrapKeys ? keys : _.flatten(_.map(keys, (key) => key.getNativeKeys()), true)) : [null];
			}), true)), (key) => key.id);
		}

		return result;
	}

	/**
	 * @param {string} email
	 * @returns {?}
	 */
	findPublicKeyByEmailNotNative(email) {
		return _.find(this.openpgpkeysPublic(), (item) => (item && -1 < item.emails.indexOf(email))) || null;
	}

	/**
	 * @param {string} email
	 * @returns {?}
	 */
	findPrivateKeyByEmailNotNative(email) {
		return _.find(this.openpgpkeysPrivate(), (item) => (item && -1 < item.emails.indexOf(email))) || null;
	}

	/**
	 * @param {string} email
	 * @returns {?}
	 */
	findAllPublicKeysByEmailNotNative(email) {
		return _.filter(this.openpgpkeysPublic(), (item) => (item && -1 < item.emails.indexOf(email))) || null;
	}

	/**
	 * @param {string} email
	 * @returns {?}
	 */
	findAllPrivateKeysByEmailNotNative(email) {
		return _.filter(this.openpgpkeysPrivate(), (item) => (item && -1 < item.emails.indexOf(email))) || null;
	}

	/**
	 * @param {string} email
	 * @param {string=} password
	 * @returns {?}
	 */
	findPrivateKeyByEmail(email, password) {

		let privateKey = null;
		const key = _.find(this.openpgpkeysPrivate(), (item) => (item && -1 < item.emails.indexOf(email)));

		if (key)
		{
			try
			{
				privateKey = key.getNativeKeys()[0] || null;
				if (privateKey)
				{
					privateKey.decrypt(pString(password));
				}
			}
			catch (e)
			{
				privateKey = null;
			}
		}

		return privateKey;
	}

	/**
	 * @param {string=} password
	 * @returns {?}
	 */
	findSelfPrivateKey(password) {
		return this.findPrivateKeyByEmail(AccountStore.email(), password);
	}

	decryptMessage(message, recipients, fCallback) {
		if (message && message.getEncryptionKeyIds)
		{
			const privateKeys = this.findPrivateKeysByEncryptionKeyIds(message.getEncryptionKeyIds(), recipients, true);
			if (privateKeys && 0 < privateKeys.length)
			{
				showScreenPopup(require('View/Popup/MessageOpenPgp'), [(decryptedKey) => {

					if (decryptedKey)
					{
						message.decrypt(decryptedKey).then((decryptedMessage) => {
							let privateKey = null;
							if (decryptedMessage)
							{
								privateKey = this.findPrivateKeyByHex(decryptedKey.primaryKey.keyid.toHex());
								if (privateKey)
								{
									this.verifyMessage(decryptedMessage, (oValidKey, aSigningKeyIds) => {
										fCallback(privateKey, decryptedMessage, oValidKey || null, aSigningKeyIds || null);
									});
								}
								else
								{
									fCallback(privateKey, decryptedMessage);
								}
							}
							else
							{
								fCallback(privateKey, decryptedMessage);
							}

						}, () => {
							fCallback(null, null);
						});
					}
					else
					{
						fCallback(null, null);
					}

				}, privateKeys]);

				return false;
			}
		}

		fCallback(null, null);

		return false;
	}

	verifyMessage(message, fCallback) {
		if (message && message.getSigningKeyIds)
		{
			const signingKeyIds = message.getSigningKeyIds();
			if (signingKeyIds && 0 < signingKeyIds.length)
			{
				const publicKeys = this.findPublicKeysBySigningKeyIds(signingKeyIds);
				if (publicKeys && 0 < publicKeys.length)
				{
					try
					{
						const
							result = message.verify(publicKeys),
							valid = _.find(_.isArray(result) ? result : [], (item) => (item && item.valid && item.keyid));

						if (valid && valid.keyid && valid.keyid && valid.keyid.toHex)
						{
							fCallback(this.findPublicKeyByHex(valid.keyid.toHex()));
							return true;
						}
					}
					catch (e)
					{
						log(e);
					}
				}

				fCallback(null, signingKeyIds);
				return false;
			}
		}

		fCallback(null);
		return false;
	}

	controlsHelper(dom, verControl, success, title, text) {
		if (success)
		{
			dom.removeClass('error').addClass('success').attr('title', title);
			verControl.removeClass('error').addClass('success').attr('title', title);
		}
		else
		{
			dom.removeClass('success').addClass('error').attr('title', title);
			verControl.removeClass('success').addClass('error').attr('title', title);
		}

		if (!isUnd(text))
		{
			dom.text(trim(text));
		}
	}

	static domControlEncryptedClickHelper(store, dom, armoredMessage, recipients) {

		return function() {

			let message = null;
			const $this = $(this); // eslint-disable-line no-invalid-this

			if ($this.hasClass('success'))
			{
				return false;
			}

			try
			{
				message = store.openpgp.message.readArmored(armoredMessage);
			}
			catch (e)
			{
				log(e);
			}

			if (message && message.getText && message.verify && message.decrypt)
			{
				store.decryptMessage(message, recipients, (validPrivateKey, decryptedMessage, validPublicKey, signingKeyIds) => {
					if (decryptedMessage)
					{
						if (validPublicKey)
						{
							store.controlsHelper(dom, $this, true, i18n('PGP_NOTIFICATIONS/GOOD_SIGNATURE', {
								'USER': validPublicKey.user + ' (' + validPublicKey.id + ')'
							}), decryptedMessage.getText());
						}
						else if (validPrivateKey)
						{
							const
								keyIds = isNonEmptyArray(signingKeyIds) ? signingKeyIds : null,
								additional = keyIds ? _.compact(_.map(keyIds,
									(item) => (item && item.toHex ? item.toHex() : null))).join(', ') : '';

							store.controlsHelper(dom, $this, false, i18n('PGP_NOTIFICATIONS/UNVERIFIRED_SIGNATURE') +
								(additional ? ' (' + additional + ')' : ''), decryptedMessage.getText());
						}
						else
						{
							store.controlsHelper(dom, $this, false, i18n('PGP_NOTIFICATIONS/DECRYPTION_ERROR'));
						}
					}
					else
					{
						store.controlsHelper(dom, $this, false, i18n('PGP_NOTIFICATIONS/DECRYPTION_ERROR'));
					}
				});

				return false;
			}

			store.controlsHelper(dom, $this, false, i18n('PGP_NOTIFICATIONS/DECRYPTION_ERROR'));
			return false;
		};
	}

	static domControlSignedClickHelper(store, dom, armoredMessage) {

		return function() {

			let message = null;
			const $this = $(this); // eslint-disable-line no-invalid-this

			if ($this.hasClass('success') || $this.hasClass('error'))
			{
				return false;
			}

			try
			{
				message = store.openpgp.cleartext.readArmored(armoredMessage);
			}
			catch (e)
			{
				log(e);
			}

			if (message && message.getText && message.verify)
			{
				store.verifyMessage(message, (validKey, signingKeyIds) => {
					if (validKey)
					{
						store.controlsHelper(dom, $this, true, i18n('PGP_NOTIFICATIONS/GOOD_SIGNATURE', {
							'USER': validKey.user + ' (' + validKey.id + ')'
						}), message.getText());
					}
					else
					{
						const
							keyIds = isNonEmptyArray(signingKeyIds) ? signingKeyIds : null,
							additional = keyIds ? _.compact(_.map(keyIds, (item) => (item && item.toHex ? item.toHex() : null))).join(', ') : '';

						store.controlsHelper(dom, $this, false,
							i18n('PGP_NOTIFICATIONS/UNVERIFIRED_SIGNATURE') + (additional ? ' (' + additional + ')' : ''));
					}
				});

				return false;
			}

			store.controlsHelper(dom, $this, false, i18n('PGP_NOTIFICATIONS/DECRYPTION_ERROR'));
			return false;
		};
	}

	/**
	 * @param {*} dom
	 * @param {MessageModel} rainLoopMessage
	 */
	initMessageBodyControls(dom, rainLoopMessage) {
		if (dom && !dom.hasClass('inited'))
		{
			dom.addClass('inited');

			const
				encrypted = dom.hasClass('encrypted'),
				signed = dom.hasClass('signed'),
				recipients = rainLoopMessage ? rainLoopMessage.getEmails(['from', 'to', 'cc']) : [];

			let verControl = null;

			if (encrypted || signed)
			{
				const domText = dom.text();
				dom.data('openpgp-original', domText);

				if (encrypted)
				{
					verControl = $('<div class="b-openpgp-control"><i class="icon-lock"></i></div>')
						.attr('title', i18n('MESSAGE/PGP_ENCRYPTED_MESSAGE_DESC'))
						.on('click', PgpUserStore.domControlEncryptedClickHelper(this, dom, domText, recipients));
				}
				else if (signed)
				{
					verControl = $('<div class="b-openpgp-control"><i class="icon-lock"></i></div>')
						.attr('title', i18n('MESSAGE/PGP_SIGNED_MESSAGE_DESC'))
						.on('click', PgpUserStore.domControlSignedClickHelper(this, dom, domText));
				}

				if (verControl)
				{
					dom.before(verControl).before('<div></div>');
				}
			}
		}
	}
}

export default new PgpUserStore();