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


///// variables
const thumbWidth = 420
const thumbHeight = 280
const thumbQuality = 80

const maxCaptionLength = 100

///////////////////////////////////////////////////////////////////////////////////////////// create image
module.exports.create = [
  [
    body('caption')
       .exists().withMessage(_sr['fa'].required.caption)
  ],
  async (req, res) => {
    ////////////// check validation result
    const errors = validationResult(req)
    if (!errors.isEmpty()) return res.status(422).json({validation: errors.mapped()})
    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}}})


    let image = req.files.image
    let imageName = 'gallery_' + Date.now() + '.' + image.mimetype.split('/')[1]

    if (image) {
      //////// validate image format
      try {
        const target = sharp(image.data)
        await target.toFile(`./static/uploads/images/gallery/${imageName}`)
        await target
           .resize(thumbWidth, thumbHeight, {fit: 'cover'})
           .jpeg({quality: thumbQuality})
           .toFile(`./static/uploads/images/gallery/thumb/thumb_${imageName}`)
      } catch (e) {
        return res500(res, e)
      }
    }
    ////////////// pass values throw model
    let gallery = new Gallery({
      image: imageName,
      caption: req.body.caption,
      shortCaption: req.body.caption.slice(0, maxCaptionLength)
    })
    gallery.save((err, data) => {
      if (err) return res500(res, err)
      else return res.json({message: _sr['fa'].response.success_save})

    })
  }
]

///////////////////////////////////////////////////////////////////////////////////////////// get all images
module.exports.getAll = [
  (req, res) => {
    Gallery.find({}, (err, images) => {
      if (err) return res500(res, err)
      return res.json(images)
    })
  }
]

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

///////////////////////////////////////////////////////////////////////////////////////////// update image
module.exports.update = [
  [
    body('caption')
       .exists().withMessage(_sr['fa'].required.caption)
  ],
  async (req, res) => {
    ////////////// check validation result
    const errors = validationResult(req)
    if (!errors.isEmpty()) return res.status(422).json({validation: errors.mapped()})

    let data = {}
    data.caption = req.body.caption.slice(0, maxCaptionLength) + ' ... '
    /////
    if (req.files?.image) {
      let image = req.files.image
      let imageName = 'gallery_' + Date.now() + '.' + image.mimetype.split('/')[1]

      //////// validate image format
      if (!_sr.supportedImageFormats.includes(image.mimetype.split('/')[1])) return res.status(422).json({validation: {image: {msg: _sr['fa'].format.image}}})
      data.image = imageName
      try {
        const target = sharp(image.data)
        await target.toFile(`./static/uploads/images/gallery/${imageName}`)
        await target
           .resize(thumbWidth, thumbHeight, {fit: 'cover'})
           .jpeg({quality: thumbQuality})
           .toFile(`./static/uploads/images/gallery/thumb/thumb_${imageName}`)
      } catch (e) {
        return res500(res, e)
      }
    }
    ////////////// pass values throw model
    Gallery.findByIdAndUpdate(req.params.id, data, (err, oldData) => {
      if (err || !oldData) return res404(res, err)
      if (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})
    })
  }
]

///////////////////////////////////////////////////////////////////////////////////////////// delete image
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})
    })
  }
]