import express from 'express';
import bodyParser from 'body-parser';

import ModelFileModel from '../models/model_file';
import ModelModel from '../models/model';
import UserModel from '../models/user';
import _ from 'lodash';
import ModelValidate from './validate/model';
import res400 from './validate/res400';
import db from '../db';
import mongoose from "mongoose";

const router = express.Router();

router.get('/model/groups', (req, res, next) => {
	if (!req.auth(res, ['predict', 'read', 'write', 'dev', 'admin'], 'basic')) return;

	let conditions: any = [{}, {}];
	if (['dev', 'admin'].indexOf(req.authDetails.level) < 0) {  // if not dev or admin, user has to possess model rights
		conditions = [
			{'models._id': {$in: req.authDetails.models.map(e => mongoose.Types.ObjectId(e))}},
			{group: true, 'models.$': true}
		]
	}
	ModelModel.find(...conditions).lean().exec((err, data) => {
		if (err) return next(err);

		// validate all and filter null values from validation errors
		res.json(_.compact(data.map(e => ModelValidate.output(e))));
	});
});

router.post('/model/:group', (req, res, next) => {
	if (!req.auth(res, ['dev', 'admin'], 'basic')) return;

	const {error, value: model} = ModelValidate.input(req.body);
	if (error) return res400(error, res);

	ModelModel.findOne({group: req.params.group}).lean().exec((err, data) => {
		if (err) return next(err);

		if (data) {  // group exists
			if (data.models.find(e => e.name === model.name)) {  // name exists, overwrite
				ModelModel.findOneAndUpdate(
					{$and: [{group: req.params.group}, {'models.name': model.name}]},
					{'models.$': model},
					{upsert: true}).log(req).lean().exec(err => {
						if (err) return next(err);
						res.json({status: 'OK'})
					});
			}
			else {  // create new
				ModelModel.findOneAndUpdate(
					{group: req.params.group},
					{$push: {models: model as never}}
				).log(req).lean().exec(err => {
					if (err) return next(err);
					res.json({status: 'OK'});
				});
			}
		}
		else {  // create new group
			new ModelModel({group: req.params.group, models: [model]}).save((err, data) => {
				if (err) return next(err);
				db.log(req, 'models', {_id: data._id}, data.toObject());
				res.json({status: 'OK'});
			});
		}
	});
});

router.delete('/model/:group(((?!file)[^\\/]+?))/:name', (req, res, next) => {
	if (!req.auth(res, ['dev', 'admin'], 'basic')) return;

	ModelModel.findOne({group: req.params.group}).lean().exec((err, data) => {
		if (err) return next(err);

		if (!data || !data.models.find(e => e.name === req.params.name)) {
			return res.status(404).json({status: 'Not found'});
		}
		// delete all references in user.models
		UserModel.updateMany({}, {$pull: {models: data.models.find(e => e.name === req.params.name)._id as never}},
							 { multi: true }).log(req).lean().exec(err => {
								 if (err) return next(err);
								 if (data.models.length > 1) {  // only remove model
									 ModelModel.findOneAndUpdate(
										 {group: req.params.group},
										 {$pull: {models: data.models.find(e => e.name === req.params.name) as never}}
									 ).log(req).lean().exec(err => {
										 if (err) return next(err);
										 res.json({status: 'OK'})
									 });
								 }
								 else {  // remove document
									 ModelModel.findOneAndDelete({group: req.params.group}).log(req).lean().exec(err => {
										 if (err) return next(err);
										 res.json({status: 'OK'})
									 });
								 }
							 });
	});
});

router.get('/model/files', (req, res, next) => {
	if (!req.auth(res, ['dev', 'admin'], 'basic')) return;

	ModelFileModel.find().exec((err, data) => {
		if (err) return next(err);
		res.json(data.map(e => ModelValidate.fileOutput(e)));
	});
});

router.get('/model/file/:name', (req, res, next) => {
	if (!req.auth(res, ['dev', 'admin'], 'all')) return;

	ModelFileModel.findOne({name: req.params.name}).lean().exec((err, data) => {
		if (err) return next(err);
		if (data) {
			res.set('Content-Type', 'application/octet-stream');
			res.send(data.data.buffer);
		}
		else {
			res.status(404).json({status: 'Not found'});
		}
	});
});

router.post('/model/file/:name', bodyParser.raw({limit: '50mb'}), (req, res, next) => {
	if (!req.auth(res, ['dev', 'admin'], 'all')) return;

	ModelFileModel.replaceOne({name: req.params.name}, {name: req.params.name, data: req.body}).setOptions({upsert: true})
	.lean().exec(err => {
		if (err) return next(err);
		res.json({status: 'OK'});
	});
});

router.delete('/model/file/:name', (req, res, next) => {
	if (!req.auth(res, ['dev', 'admin'], 'basic')) return;

	ModelFileModel.findOneAndDelete({name: req.params.name}).lean().exec((err, data) => {
		if (err) return next(err);
		if (data) {
			res.json({status: 'OK'});
		}
		else {
			res.status(404).json({status: 'Not found'});
		}
	});
});

router.get('/model/authorized/:url', (req, res, next) => {
	if (!req.auth(res, ['predict', 'read', 'write', 'dev', 'admin'], 'basic')) return;

	if (['dev', 'admin'].indexOf(req.authDetails.level) < 0) {  // if not dev or admin, user has to possess model rights
		ModelModel.findOne({models: { $elemMatch: {
			url: decodeURIComponent(req.params.url),
			'_id': {$in: req.authDetails.models.map(e => mongoose.Types.ObjectId(e))}
		}}}).lean().exec((err, data) => {
			if (err) return next(err);
			if (data) {
				res.json({status: 'OK'});
			}
			else {
				res.status(403).json({status: 'Forbidden'});
			}
		});
	}
	else {
		res.json({status: 'OK'});
	}
});

module.exports = router;