const Gallery = require('../models/Gallery')
const mongoose = require('mongoose')
const sharp = require('sharp')
const fs = require('fs')
const {body, validationResult} = require('express-validator')
const {res404, res500, checkValidations} = require('../plugins/controllersHelperFunctions')
const {_sr} = require('../plugins/serverResponses')

// variables
const imageQuality = 100

const imageThumbWidth = 500
const imageThumbHeight = 500
const imageThumbQuality = 80

module.exports.create = [
  [
    body('category')
       .if((value, {req}) => req.body.noCategory === 'false')
       .notEmpty().withMessage(_sr['fa'].required.category)
       .bail()
       .custom((value, {req}) => {
         return mongoose.isValidObjectId(value) ? true : Promise.reject(_sr['fa'].required.category)
       })
  ],
  checkValidations(validationResult),
  async (req, res) => {
    try {
      if (!req.files || !req.files.image) return res.status(422).json({validation: {image: {msg: _sr['fa'].required.image}}})
      if (!_sr.supportedImageFormats.includes(req.files.image.mimetype.split('/')[1])) return res.status(422).json({validation: {image: {msg: _sr['fa'].format.image}}})

      const {fa_caption, en_caption, category, noCategory} = req.body

      const data = {
        locale: {
          fa: {
            caption: fa_caption
          },
          en: {
            caption: en_caption
          }
        },
        noCategory
      }
      if (mongoose.isValidObjectId(category)) data.category = category
      const image = req.files.image
      const imageName = 'gallery_' + Date.now() + '.jpg'
      const imageThumb = 'thumb_' + imageName

      try {
        const target = await sharp(image.data)
        await target
           .toFormat('jpg')
           .jpeg({quality: imageQuality})
           .toFile(`./static/uploads/images/gallery/${imageName}`)

        await target
           .resize(imageThumbWidth, imageThumbHeight, {fit: 'cover'})
           .withMetadata()
           .toFormat('jpg')
           .jpeg({quality: imageThumbQuality})
           .toFile(`./static/uploads/images/gallery/${imageThumb}`)

        data.image = imageName
        data.thumb = imageThumb
      } catch (e) {
        return res500(res , _sr['fa'].response.problem)
      }

      const post = new Gallery(data)
      post.save((err, data) => {
        if (err) return res500(res , _sr['fa'].response.problem)
        return res.json(data)
      })
    }catch (e) {
      return res500(res , _sr['fa'].response.problem)
    }
  }
]

module.exports.getAll = [
  (req, res) => {
    Gallery.find({}).populate('category').sort({_id: -1}).exec((err, images) => {
      if (err) return res500(res, err)
      else return res.json(images)
    })
  }
]

module.exports.getByCategoryId = [
  (req, res) => {
    Gallery.find({category: req.params.id}).sort({_id: -1}).exec((err, images) => {
      if (err) return res500(res, err)
      else return res.json(images)
    })
  }
]

module.exports.getOne = [
  (req, res) => {
    Gallery.findById(req.params.id, (err, image) => {
      if (err || !image) return res404(res, err)
      else return res.json(image)
    })
  }
]

module.exports.update = [
  [
    body('category')
       .if((value, {req}) => req.body.noCategory === 'false')
       .notEmpty().withMessage(_sr['fa'].required.category)
       .bail()
       .custom((value, {req}) => {
         return mongoose.isValidObjectId(value) ? true : Promise.reject(_sr['fa'].required.category)
       })
  ],
  checkValidations(validationResult),
  async (req, res) => {
    const {fa_caption, en_caption, category, noCategory} = req.body

    const data = {
      locale: {
        fa: {
          caption: fa_caption
        },
        en: {
          caption: en_caption
        }
      },
      noCategory
    }
    if (mongoose.isValidObjectId(category)) data.category = category
    if (req.files && req.files.image) {
      if (!_sr.supportedImageFormats.includes(req.files.image.mimetype.split('/')[1])) return res.status(422).json({validation: {image: {msg: _sr['fa'].format.image}}})

      const image = req.files.image
      const imageName = 'gallery_' + Date.now() + '.jpg'
      const imageThumb = 'thumb_' + imageName

      try {
        const target = await sharp(image.data)
        await target
           .toFormat('jpg')
           .jpeg({quality: imageQuality})
           .toFile(`./static/uploads/images/gallery/${imageName}`)

        await target
           .resize(imageThumbWidth, imageThumbHeight, {fit: 'cover'})
           .withMetadata()
           .toFormat('jpg')
           .jpeg({quality: imageThumbQuality})
           .toFile(`./static/uploads/images/gallery/${imageThumb}`)

        data.image = imageName
        data.thumb = imageThumb
      } catch (e) {
        return res500(res, e)
      }
    }

    Gallery.findByIdAndUpdate(req.params.id, data, (err, oldData) => {
      if (err || !oldData) return res404(res, err)
      if (req.files && req.files.image) {
        fs.unlink(`./static/${oldData.image}`, (err) => {
          if (err) console.log(err)
        })
        fs.unlink(`./static/${oldData.thumb}`, (err) => {
          if (err) console.log(err)
        })
      }
      return res.json({message: _sr['fa'].response.success_save})
    })
  }
]

module.exports.delete = [
  (req, res) => {
    Gallery.findByIdAndRemove(req.params.id, (err, data) => {
      if (err || !data) return res404(res, err)
      fs.unlink(`./static/${data.image}`, err => {
        if (err) console.log(err)
      })
      fs.unlink(`./static/${data.thumb}`, err => {
        if (err) console.log(err)
      })
      return res.json({message: _sr['fa'].response.success_remove})
    })
  }
]