const { BaseCommand } = require('./base-command.js');
const { _ } = require('lib/locale.js');
const EncryptionService = require('lib/services/EncryptionService');
const DecryptionWorker = require('lib/services/DecryptionWorker');
const BaseItem = require('lib/models/BaseItem');
const Setting = require('lib/models/Setting.js');
const { shim } = require('lib/shim');
const pathUtils = require('lib/path-utils.js');
const imageType = require('image-type');
const readChunk = require('read-chunk');

class Command extends BaseCommand {
	usage() {
		return 'e2ee <command> [path]';
	}

	description() {
		return _('Manages E2EE configuration. Commands are `enable`, `disable`, `decrypt`, `status`, `decrypt-file` and `target-status`.');
	}

	options() {
		return [
			// This is here mostly for testing - shouldn't be used
			['-p, --password <password>', 'Use this password as master password (For security reasons, it is not recommended to use this option).'],
			['-v, --verbose', 'More verbose output for the `target-status` command'],
			['-o, --output <directory>', 'Output directory'],
			['--retry-failed-items', 'Applies to `decrypt` command - retries decrypting items that previously could not be decrypted.'],
		];
	}

	async action(args) {
		const options = args.options;

		const askForMasterKey = async error => {
			const masterKeyId = error.masterKeyId;
			const password = await this.prompt(_('Enter master password:'), { type: 'string', secure: true });
			if (!password) {
				this.stdout(_('Operation cancelled'));
				return false;
			}
			Setting.setObjectKey('encryption.passwordCache', masterKeyId, password);
			await EncryptionService.instance().loadMasterKeysFromSettings();
			return true;
		};

		const startDecryption = async () => {
			this.stdout(_('Starting decryption... Please wait as it may take several minutes depending on how much there is to decrypt.'));

			while (true) {
				try {
					await DecryptionWorker.instance().start();
					break;
				} catch (error) {
					if (error.code === 'masterKeyNotLoaded') {
						const ok = await askForMasterKey(error);
						if (!ok) return;
						continue;
					}

					throw error;
				}
			}

			this.stdout(_('Completed decryption.'));
		};

		if (args.command === 'enable') {
			const password = options.password ? options.password.toString() : await this.prompt(_('Enter master password:'), { type: 'string', secure: true });
			if (!password) {
				this.stdout(_('Operation cancelled'));
				return;
			}
			const password2 = await this.prompt(_('Confirm password:'), { type: 'string', secure: true });
			if (!password2) {
				this.stdout(_('Operation cancelled'));
				return;
			}
			if (password !== password2) {
				this.stdout(_('Passwords do not match!'));
				return;
			}
			await EncryptionService.instance().generateMasterKeyAndEnableEncryption(password);
			return;
		}

		if (args.command === 'disable') {
			await EncryptionService.instance().disableEncryption();
			return;
		}

		if (args.command === 'decrypt') {
			if (args.path) {
				const plainText = await EncryptionService.instance().decryptString(args.path);
				this.stdout(plainText);
			} else {
				if (args.options['retry-failed-items']) await DecryptionWorker.instance().clearDisabledItems();
				await startDecryption();
			}

			return;
		}

		if (args.command === 'status') {
			this.stdout(_('Encryption is: %s', Setting.value('encryption.enabled') ? _('Enabled') : _('Disabled')));
			return;
		}

		if (args.command === 'decrypt-file') {
			while (true) {
				try {
					const outputDir = options.output ? options.output : require('os').tmpdir();
					let outFile = `${outputDir}/${pathUtils.filename(args.path)}.${Date.now()}.bin`;
					await EncryptionService.instance().decryptFile(args.path, outFile);
					const buffer = await readChunk(outFile, 0, 64);
					const detectedType = imageType(buffer);

					if (detectedType) {
						const newOutFile = `${outFile}.${detectedType.ext}`;
						await shim.fsDriver().move(outFile, newOutFile);
						outFile = newOutFile;
					}

					this.stdout(outFile);
					break;
				} catch (error) {
					if (error.code === 'masterKeyNotLoaded') {
						const ok = await askForMasterKey(error);
						if (!ok) return;
						continue;
					}

					throw error;
				}
			}
			return;
		}

		if (args.command === 'target-status') {
			const fs = require('fs-extra');

			const targetPath = args.path;
			if (!targetPath) throw new Error('Please specify the sync target path.');

			const dirPaths = function(targetPath) {
				const paths = [];
				fs.readdirSync(targetPath).forEach(path => {
					paths.push(path);
				});
				return paths;
			};

			let itemCount = 0;
			let resourceCount = 0;
			let encryptedItemCount = 0;
			let encryptedResourceCount = 0;
			let otherItemCount = 0;

			const encryptedPaths = [];
			const decryptedPaths = [];

			const paths = dirPaths(targetPath);

			for (let i = 0; i < paths.length; i++) {
				const path = paths[i];
				const fullPath = `${targetPath}/${path}`;
				const stat = await fs.stat(fullPath);

				// this.stdout(fullPath);

				if (path === '.resource') {
					const resourcePaths = dirPaths(fullPath);
					for (let j = 0; j < resourcePaths.length; j++) {
						const resourcePath = resourcePaths[j];
						resourceCount++;
						const fullResourcePath = `${fullPath}/${resourcePath}`;
						const isEncrypted = await EncryptionService.instance().fileIsEncrypted(fullResourcePath);
						if (isEncrypted) {
							encryptedResourceCount++;
							encryptedPaths.push(fullResourcePath);
						} else {
							decryptedPaths.push(fullResourcePath);
						}
					}
				} else if (stat.isDirectory()) {
					continue;
				} else {
					const content = await fs.readFile(fullPath, 'utf8');
					const item = await BaseItem.unserialize(content);
					const ItemClass = BaseItem.itemClass(item);

					if (!ItemClass.encryptionSupported()) {
						otherItemCount++;
						continue;
					}

					itemCount++;

					const isEncrypted = await EncryptionService.instance().itemIsEncrypted(item);

					if (isEncrypted) {
						encryptedItemCount++;
						encryptedPaths.push(fullPath);
					} else {
						decryptedPaths.push(fullPath);
					}
				}
			}

			this.stdout(`Encrypted items: ${encryptedItemCount}/${itemCount}`);
			this.stdout(`Encrypted resources: ${encryptedResourceCount}/${resourceCount}`);
			this.stdout(`Other items (never encrypted): ${otherItemCount}`);

			if (options.verbose) {
				this.stdout('');
				this.stdout('# Encrypted paths');
				this.stdout('');
				for (let i = 0; i < encryptedPaths.length; i++) {
					const path = encryptedPaths[i];
					this.stdout(path);
				}

				this.stdout('');
				this.stdout('# Decrypted paths');
				this.stdout('');
				for (let i = 0; i < decryptedPaths.length; i++) {
					const path = decryptedPaths[i];
					this.stdout(path);
				}
			}

			return;
		}
	}
}

module.exports = Command;