import JoplinServerApi from './JoplinServerApi';
import { trimSlashes, dirname, basename } from './path-utils';

// All input paths should be in the format: "path/to/file". This is converted to
// "root:/path/to/file:" when doing the API call.

export default class FileApiDriverJoplinServer {

	private api_: JoplinServerApi;

	public constructor(api: JoplinServerApi) {
		this.api_ = api;
	}

	public async initialize(basePath: string) {
		const pieces = trimSlashes(basePath).split('/');
		if (!pieces.length) return;

		const parent: string[] = [];

		for (let i = 0; i < pieces.length; i++) {
			const p = pieces[i];
			const subPath = parent.concat(p).join('/');
			parent.push(p);
			await this.mkdir(subPath);
		}
	}

	public api() {
		return this.api_;
	}

	public requestRepeatCount() {
		return 3;
	}

	private metadataToStat_(md: any, path: string, isDeleted: boolean = false) {
		const output = {
			path: path,
			updated_time: md.updated_time,
			isDir: !!md.is_directory,
			isDeleted: isDeleted,
		};

		// TODO - HANDLE DELETED
		// if (md['.tag'] === 'deleted') output.isDeleted = true;

		return output;
	}

	private metadataToStats_(mds: any[]) {
		const output = [];
		for (let i = 0; i < mds.length; i++) {
			output.push(this.metadataToStat_(mds[i], mds[i].name));
		}
		return output;
	}

	// Transforms a path such as "Apps/Joplin/file.txt" to a complete a complete
	// API URL path: "api/files/root:/Apps/Joplin/file.txt:"
	private apiFilePath_(p: string) {
		return `api/files/root:/${trimSlashes(p)}:`;
	}

	public async stat(path: string) {
		try {
			const response = await this.api().exec('GET', this.apiFilePath_(path));
			return this.metadataToStat_(response, path);
		} catch (error) {
			if (error.code === 404) return null;
			throw error;
		}
	}

	public async delta(path: string, options: any) {
		const context = options ? options.context : null;
		let cursor = context ? context.cursor : null;

		while (true) {
			try {
				const query = cursor ? { cursor } : {};
				const response = await this.api().exec('GET', `${this.apiFilePath_(path)}/delta`, query);
				const stats = response.items.map((item: any) => {
					return this.metadataToStat_(item.item, item.item.name, item.type === 3);
				});

				const output = {
					items: stats,
					hasMore: response.has_more,
					context: { cursor: response.cursor },
				};

				return output;
			} catch (error) {
				// If there's an error related to an invalid cursor, clear the cursor and retry.
				if (cursor && error.code === 'resyncRequired') {
					cursor = null;
					continue;
				}
				throw error;
			}
		}
	}

	public async list(path: string, options: any = null) {
		options = {
			context: null,
			...options,
		};

		const query = options.context?.cursor ? { cursor: options.context.cursor } : null;

		const results = await this.api().exec('GET', `${this.apiFilePath_(path)}/children`, query);

		const newContext: any = {};
		if (results.cursor) newContext.cursor = results.cursor;

		return {
			items: this.metadataToStats_(results.items),
			hasMore: results.has_more,
			context: newContext,
		} as any;
	}

	public async get(path: string, options: any) {
		if (!options) options = {};
		if (!options.responseFormat) options.responseFormat = 'text';
		try {
			const response = await this.api().exec('GET', `${this.apiFilePath_(path)}/content`, null, null, null, options);
			return response;
		} catch (error) {
			if (error.code !== 404) throw error;
			return null;
		}
	}

	private parentPath_(path: string) {
		return dirname(path);
	}

	private basename_(path: string) {
		return basename(path);
	}

	public async mkdir(path: string) {
		const parentPath = this.parentPath_(path);
		const filename = this.basename_(path);

		try {
			const response = await this.api().exec('POST', `${this.apiFilePath_(parentPath)}/children`, null, {
				name: filename,
				is_directory: 1,
			});
			return response;
		} catch (error) {
			// 409 is OK - directory already exists
			if (error.code !== 409) throw error;
		}
	}

	public async put(path: string, content: any, options: any = null) {
		return this.api().exec('PUT', `${this.apiFilePath_(path)}/content`, null, content, {
			'Content-Type': 'application/octet-stream',
		}, options);
	}

	public async delete(path: string) {
		return this.api().exec('DELETE', this.apiFilePath_(path));
	}

	public format() {
		throw new Error('Not supported');
	}

	public async clearRoot(path: string) {
		await this.delete(path);
		await this.mkdir(path);
	}
}