import { Meteor } from 'meteor/meteor';
import { Random } from 'meteor/random';
import objectPath from 'object-path';

import { slashCommands } from '../../../utils/server';
import { Messages } from '../../../models/server';
import { canAccessRoomId } from '../../../authorization/server';
import { API } from '../api';

API.v1.addRoute(
	'commands.get',
	{ authRequired: true },
	{
		get() {
			const params = this.queryParams;

			if (typeof params.command !== 'string') {
				return API.v1.failure('The query param "command" must be provided.');
			}

			const cmd = slashCommands.commands[params.command.toLowerCase()];

			if (!cmd) {
				return API.v1.failure(`There is no command in the system by the name of: ${params.command}`);
			}

			return API.v1.success({ command: cmd });
		},
	},
);

// TODO: replace with something like client/lib/minimongo
const processQueryOptionsOnResult = (result, options = {}) => {
	if (result === undefined || result === null) {
		return undefined;
	}

	if (Array.isArray(result)) {
		if (options.sort) {
			result = result.sort((a, b) => {
				let r = 0;
				for (const field in options.sort) {
					if (options.sort.hasOwnProperty(field)) {
						const direction = options.sort[field];
						let valueA;
						let valueB;
						if (field.indexOf('.') > -1) {
							valueA = objectPath.get(a, field);
							valueB = objectPath.get(b, field);
						} else {
							valueA = a[field];
							valueB = b[field];
						}
						if (valueA > valueB) {
							r = direction;
							break;
						}
						if (valueA < valueB) {
							r = -direction;
							break;
						}
					}
				}
				return r;
			});
		}

		if (typeof options.skip === 'number') {
			result.splice(0, options.skip);
		}

		if (typeof options.limit === 'number' && options.limit !== 0) {
			result.splice(options.limit);
		}
	}

	if (!options.fields) {
		options.fields = {};
	}

	const fieldsToRemove = [];
	const fieldsToGet = [];

	for (const field in options.fields) {
		if (options.fields.hasOwnProperty(field)) {
			if (options.fields[field] === 0) {
				fieldsToRemove.push(field);
			} else if (options.fields[field] === 1) {
				fieldsToGet.push(field);
			}
		}
	}

	if (fieldsToRemove.length > 0 && fieldsToGet.length > 0) {
		console.warn("Can't mix remove and get fields");
		fieldsToRemove.splice(0, fieldsToRemove.length);
	}

	if (fieldsToGet.length > 0 && fieldsToGet.indexOf('_id') === -1) {
		fieldsToGet.push('_id');
	}

	const pickFields = (obj, fields) => {
		const picked = {};
		fields.forEach((field) => {
			if (field.indexOf('.') !== -1) {
				objectPath.set(picked, field, objectPath.get(obj, field));
			} else {
				picked[field] = obj[field];
			}
		});
		return picked;
	};

	if (fieldsToRemove.length > 0 || fieldsToGet.length > 0) {
		if (Array.isArray(result)) {
			result = result.map((record) => {
				if (fieldsToRemove.length > 0) {
					return Object.fromEntries(Object.entries(record).filter(([key]) => !fieldsToRemove.includes(key)));
				}

				if (fieldsToGet.length > 0) {
					return pickFields(record, fieldsToGet);
				}

				return null;
			});
		} else {
			if (fieldsToRemove.length > 0) {
				return Object.fromEntries(Object.entries(result).filter(([key]) => !fieldsToRemove.includes(key)));
			}

			if (fieldsToGet.length > 0) {
				return pickFields(result, fieldsToGet);
			}
		}
	}

	return result;
};

API.v1.addRoute(
	'commands.list',
	{ authRequired: true },
	{
		get() {
			const { offset, count } = this.getPaginationItems();
			const { sort, fields, query } = this.parseJsonQuery();

			let commands = Object.values(slashCommands.commands);

			if (query && query.command) {
				commands = commands.filter((command) => command.command === query.command);
			}

			const totalCount = commands.length;
			commands = processQueryOptionsOnResult(commands, {
				sort: sort || { name: 1 },
				skip: offset,
				limit: count,
				fields,
			});

			return API.v1.success({
				commands,
				offset,
				count: commands.length,
				total: totalCount,
			});
		},
	},
);

// Expects a body of: { command: 'gimme', params: 'any string value', roomId: 'value', triggerId: 'value' }
API.v1.addRoute(
	'commands.run',
	{ authRequired: true },
	{
		post() {
			const body = this.bodyParams;
			const user = this.getLoggedInUser();

			if (typeof body.command !== 'string') {
				return API.v1.failure('You must provide a command to run.');
			}

			if (body.params && typeof body.params !== 'string') {
				return API.v1.failure('The parameters for the command must be a single string.');
			}

			if (typeof body.roomId !== 'string') {
				return API.v1.failure("The room's id where to execute this command must be provided and be a string.");
			}

			if (body.tmid && typeof body.tmid !== 'string') {
				return API.v1.failure('The tmid parameter when provided must be a string.');
			}

			const cmd = body.command.toLowerCase();
			if (!slashCommands.commands[cmd]) {
				return API.v1.failure('The command provided does not exist (or is disabled).');
			}

			if (!canAccessRoomId(body.roomId, user._id)) {
				return API.v1.unauthorized();
			}

			const params = body.params ? body.params : '';
			const message = {
				_id: Random.id(),
				rid: body.roomId,
				msg: `/${cmd} ${params}`,
			};

			if (body.tmid) {
				const thread = Messages.findOneById(body.tmid);
				if (!thread || thread.rid !== body.roomId) {
					return API.v1.failure('Invalid thread.');
				}
				message.tmid = body.tmid;
			}

			const { triggerId } = body;

			const result = Meteor.runAsUser(user._id, () => slashCommands.run(cmd, params, message, triggerId));

			return API.v1.success({ result });
		},
	},
);

API.v1.addRoute(
	'commands.preview',
	{ authRequired: true },
	{
		// Expects these query params: command: 'giphy', params: 'mine', roomId: 'value'
		get() {
			const query = this.queryParams;
			const user = this.getLoggedInUser();

			if (typeof query.command !== 'string') {
				return API.v1.failure('You must provide a command to get the previews from.');
			}

			if (query.params && typeof query.params !== 'string') {
				return API.v1.failure('The parameters for the command must be a single string.');
			}

			if (typeof query.roomId !== 'string') {
				return API.v1.failure("The room's id where the previews are being displayed must be provided and be a string.");
			}

			const cmd = query.command.toLowerCase();
			if (!slashCommands.commands[cmd]) {
				return API.v1.failure('The command provided does not exist (or is disabled).');
			}

			if (!canAccessRoomId(query.roomId, user._id)) {
				return API.v1.unauthorized();
			}

			const params = query.params ? query.params : '';

			let preview;
			Meteor.runAsUser(user._id, () => {
				preview = Meteor.call('getSlashCommandPreviews', {
					cmd,
					params,
					msg: { rid: query.roomId },
				});
			});

			return API.v1.success({ preview });
		},
		// Expects a body format of: { command: 'giphy', params: 'mine', roomId: 'value', tmid: 'value', triggerId: 'value', previewItem: { id: 'sadf8' type: 'image', value: 'https://dev.null/gif' } }
		post() {
			const body = this.bodyParams;
			const user = this.getLoggedInUser();

			if (typeof body.command !== 'string') {
				return API.v1.failure('You must provide a command to run the preview item on.');
			}

			if (body.params && typeof body.params !== 'string') {
				return API.v1.failure('The parameters for the command must be a single string.');
			}

			if (typeof body.roomId !== 'string') {
				return API.v1.failure("The room's id where the preview is being executed in must be provided and be a string.");
			}

			if (typeof body.previewItem === 'undefined') {
				return API.v1.failure('The preview item being executed must be provided.');
			}

			if (!body.previewItem.id || !body.previewItem.type || typeof body.previewItem.value === 'undefined') {
				return API.v1.failure('The preview item being executed is in the wrong format.');
			}

			if (body.tmid && typeof body.tmid !== 'string') {
				return API.v1.failure('The tmid parameter when provided must be a string.');
			}

			if (body.triggerId && typeof body.triggerId !== 'string') {
				return API.v1.failure('The triggerId parameter when provided must be a string.');
			}

			const cmd = body.command.toLowerCase();
			if (!slashCommands.commands[cmd]) {
				return API.v1.failure('The command provided does not exist (or is disabled).');
			}

			if (!canAccessRoomId(body.roomId, user._id)) {
				return API.v1.unauthorized();
			}

			const params = body.params ? body.params : '';
			const message = {
				rid: body.roomId,
			};

			if (body.tmid) {
				const thread = Messages.findOneById(body.tmid);
				if (!thread || thread.rid !== body.roomId) {
					return API.v1.failure('Invalid thread.');
				}
				message.tmid = body.tmid;
			}

			Meteor.runAsUser(user._id, () => {
				Meteor.call(
					'executeSlashCommandPreview',
					{
						cmd,
						params,
						msg: { rid: body.roomId, tmid: body.tmid },
					},
					body.previewItem,
					body.triggerId,
				);
			});

			return API.v1.success();
		},
	},
);