import ko from 'ko';

import { isArray, arrayLength, pString, addComputablesTo } from 'Common/Utils';

import { AccountUserStore } from 'Stores/User/Account';

import { showScreenPopup } from 'Knoin/Knoin';

import { MessageOpenPgpPopupView } from 'View/Popup/MessageOpenPgp';

export const PgpUserStore = new class {
	constructor() {
		this.openpgp = null;

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

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

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

	findKeyByHex(keys, hash) {
		return keys.find(item => hash && item && (hash === item.id || item.ids.includes(hash)));
	}

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

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

	findPublicKeysByEmail(email) {
		return this.openpgpkeysPublic().map(item => {
			const key = item && item.emails.includes(email) ? item : null;
			return key ? key.getNativeKeys() : [null];
		}).flat().filter(v => v);
	}

	findPublicKeysBySigningKeyIds(signingKeyIds) {
		return signingKeyIds.map(id => {
			const key = id && id.toHex ? this.findPublicKeyByHex(id.toHex()) : null;
			return key ? key.getNativeKeys() : [null];
		}).flat().filter(v => v);
	}

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

		if (!result.length && arrayLength(recipients)) {
			result = recipients.map(sEmail => {
				const keys = sEmail ? this.findAllPrivateKeysByEmailNotNative(sEmail) : null;
				return keys
					? returnWrapKeys
						? keys
						: keys.map(key => key.getNativeKeys()).flat()
					: [null];
			}).flat().validUnique(key => key.id);
		}

		return result;
	}

	/**
	 * @param {string} email
	 * @returns {?}
	 */
	findPublicKeyByEmailNotNative(email) {
		return this.openpgpkeysPublic().find(item => item && item.emails.includes(email)) || null;
	}

	/**
	 * @param {string} email
	 * @returns {?}
	 */
	findPrivateKeyByEmailNotNative(email) {
		return this.openpgpkeysPrivate().find(item => item && item.emails.includes(email)) || null;
	}

	/**
	 * @param {string} email
	 * @returns {?}
	 */
	findAllPublicKeysByEmailNotNative(email) {
		return this.openpgpkeysPublic().filter(item => item && item.emails.includes(email)) || null;
	}

	/**
	 * @param {string} email
	 * @returns {?}
	 */
	findAllPrivateKeysByEmailNotNative(email) {
		return this.openpgpkeysPrivate().filter(item => item && item.emails.includes(email)) || null;
	}

	/**
	 * @param {string} email
	 * @param {string=} password
	 * @returns {?}
	 */
	findPrivateKeyByEmail(email, password) {
		let privateKey = null;
		const key = this.openpgpkeysPrivate().find(item => item && item.emails.includes(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(AccountUserStore.email(), password);
	}

	decryptMessage(message, recipients, fCallback) {
		if (message && message.getEncryptionKeyIds) {
			const privateKeys = this.findPrivateKeysByEncryptionKeyIds(message.getEncryptionKeyIds(), recipients, true);
			if (privateKeys && privateKeys.length) {
				showScreenPopup(MessageOpenPgpPopupView, [
					(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 && signingKeyIds.length) {
				const publicKeys = this.findPublicKeysBySigningKeyIds(signingKeyIds);
				if (publicKeys && publicKeys.length) {
					try {
						const result = message.verify(publicKeys),
							valid = (isArray(result) ? result : []).find(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) {
						console.log(e);
					}
				}

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

		fCallback(null);
		return false;
	}

};