import express from 'express';
import _ from 'lodash';

import MaterialValidate from './validate/material';
import MaterialModel from '../models/material'
import SampleModel from '../models/sample';
import IdValidate from './validate/id';
import res400 from './validate/res400';
import mongoose from 'mongoose';



const router = express.Router();

router.get('/materials', (req, res, next) => {
  if (!req.auth(res, ['read', 'write', 'maintain', 'dev', 'admin'], 'all')) return;

  MaterialModel.find({status: 10}).lean().exec((err, data) => {
    if (err) return next(err);
    res.json(_.compact(data.map(e => MaterialValidate.output(e))));  // validate all and filter null values from validation errors
  });
});

router.get('/materials/:group(new|deleted)', (req, res, next) => {
  if (!req.auth(res, ['maintain', 'admin'], 'basic')) return;

  let status;
  switch (req.params.group) {
    case 'new': status = 0;
      break;
    case 'deleted': status = -1;
      break;
  }
  MaterialModel.find({status: status}).lean().exec((err, data) => {
    if (err) return next(err);
    console.log(data);
    res.json(_.compact(data.map(e => MaterialValidate.output(e))));  // validate all and filter null values from validation errors
  });
});

router.get('/material/' + IdValidate.parameter(), (req, res, next) => {
  if (!req.auth(res, ['read', 'write', 'maintain', 'dev', 'admin'], 'all')) return;

  MaterialModel.findById(req.params.id).lean().exec((err, data) => {
    if (err) return next(err);
    if (data) {
      res.json(MaterialValidate.output(data));
    }
    else {
      res.status(404).json({status: 'Not found'});
    }
  });
});

router.put('/material/' + IdValidate.parameter(), (req, res, next) => {
  if (!req.auth(res, ['write', 'maintain', 'dev', 'admin'], 'basic')) return;

  const {error, value: material} = MaterialValidate.input(req.body, 'change');
  if (error) return res400(error, res);

  MaterialModel.findById(req.params.id).lean().exec(async (err, materialData: any) => {
    if (!materialData) {
      return res.status(404).json({status: 'Not found'});
    }
    if (material.hasOwnProperty('name') && material.name !== materialData.name) {
      if (!await nameCheck(material, res, next)) return;
    }

    // check for changes
    if (!_.isEqual(_.pick(IdValidate.stringify(materialData), _.keys(material)), material)) {
      material.status = 0;
    }

    await MaterialModel.findByIdAndUpdate(req.params.id, material, {new: true}).lean().exec((err, data) => {
      if (err) return next(err);
      res.json(MaterialValidate.output(data));
    });
  });
});

router.delete('/material/' + IdValidate.parameter(), (req, res, next) => {
  if (!req.auth(res, ['write', 'maintain', 'dev', 'admin'], 'basic')) return;

  // check if there are still samples referencing this material
  SampleModel.find({'material_id': new mongoose.Types.ObjectId(req.params.id)}).lean().exec((err, data) => {
    if (err) return next(err);
    if (data.length) {
      return res.status(400).json({status: 'Material still in use'});
    }
    MaterialModel.findByIdAndUpdate(req.params.id, {status: -1}).lean().exec((err, data) => {
      if (err) return next(err);
      if (data) {
        res.json({status: 'OK'});
      }
      else {
        res.status(404).json({status: 'Not found'});
      }
    });
  });
});

router.post('/material/new', async (req, res, next) => {
  if (!req.auth(res, ['write', 'maintain', 'dev', 'admin'], 'basic')) return;

  // validate input
  const {error, value: material} = MaterialValidate.input(req.body, 'new');
  if (error) return res400(error, res);

  if (!await nameCheck(material, res, next)) return;

  material.status = 0;
  await new MaterialModel(material).save((err, data) => {
    if (err) return next(err);
    res.json(MaterialValidate.output(data.toObject()));
  });
});


module.exports = router;


async function nameCheck (material, res, next) {  // check if name was already taken
  const materialData = await MaterialModel.findOne({name: material.name}).lean().exec().catch(err => {next(err); return false;}) as any;
  if (materialData instanceof Error) return false;
  if (materialData) {  // could not find material_id
    res.status(400).json({status: 'Material name already taken'});
    return false;
  }
  return true;
}