#!/usr/bin/env node

const fs = require('fs')
const path = require('path')
const program = require('commander')
const imaginary = require('..')

program
  .version(imaginary.VERSION)

program
  .command('crop [image]')
  .description('Crop any image in order to fit the given width or height pixels')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('crop'))

program
  .command('smartcrop [image]')
  .description('Smart crop any image in order to fit the given width or height pixels. Requires imaginary v1.0.8+')
  .option('-s, --server [url]', 'imaginary service URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('smartcrop'))

program
  .command('resize [image]')
  .description('Resize the image to the given width or height in pixels')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('resize'))

program
  .command('embed [image]')
  .description('Embed the image to the given width or height in pixels')
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('embed'))

program
  .command('enlarge [image]')
  .description('Enlarge the image to the given width and height in pixels')
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('enlarge'))

program
  .command('extract [image]')
  .description('Extract area from an image by top/left and width/height')
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-t, --top [pixels]', 'Area top margin')
  .option('-l, --left [pixels]', 'Area left margin')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('extract'))

program
  .command('rotate [image]')
  .description('Rotate the image by degrees')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-r, --rotate [angle]', 'Image rotation angle. Must be multiple of 90. Example: 180')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('rotate'))

program
  .command('flip [image]')
  .description('Flip an image')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('flip'))

program
  .command('flop [image]')
  .description('Flop an image')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('flop'))

program
  .command('zoom [image]')
  .description('Zoom the image to the given width or height in pixels')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-f, --factor [level]', 'Zoom factor level between 1-5', 1)
  .option('-o, --output [path]', 'Output image file path')
  .action(command('zoom'))

program
  .command('watermark [image]')
  .description('Add a text watermark in the image')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-w, --width [pixels]', 'Image width resolution')
  .option('-h, --height [pixels]', 'Image height resolution')
  .option('-q, --quality [num]', 'JPEG image quality between 1-100', 80)
  .option('-c, --compression [level]', 'PNG compression level', 6)
  .option('-t, --type [name]', 'Specify the image format to output. Possible values are: jpeg, png and webp')
  .option('-x, --text [text]', 'Watermark text content. Example: copyright (c)')
  .option('-m, --margin [num]', 'Text margin in pixels. Example: 100')
  .option('-d, --dip [num]', 'DPI value for watermark. Example: 150')
  .option('-y, --textwidth [num]', 'Text width for watermark. Example: 200')
  .option('-s, --opacity [num]', 'Opacity level for watermark text. Example: 0.2')
  .option('-r, --noreplicate', 'Disable text replication in watermark')
  .option('-f, --font [value]', 'Watermark text font type and format. Example: sans bold 12')
  .option('-m, --color [value]', 'Watermark text RGB decimal base color. Example: 255,200,150')
  .option('-o, --output [path]', 'Output image file path')
  .action(command('watermark'))

program
  .command('pipeline [image]')
  .description('Pipeline processing based on a JSON file transformation. Requires imaginary v1.0.8+')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-j, --json [path]', 'Operations JSON file path to use. Optionally loaded from stdin.')
  .option('-p, --operations [json]', 'Operations JSON string to use.')
  .option('-o, --output [path]', 'Output image file path')
  .action(pipeline)

program
  .command('info [image]')
  .description('Retrieve image information as JSON')
  .option('-s, --server [url]', 'imaginary server URL', imaginary.URL)
  .option('-k, --key [code]', 'Optional imaginary server API key')
  .option('-o, --output [path]', 'Output image info file (JSON)')
  .action(command('info'))

program.on('--help', function () {
  console.log('  Examples:')
  console.log('')
  console.log('    $ imaginary crop -w 300 -h 260 -o out.jpg image.jpg')
  console.log('    $ imaginary smartcrop -w 300 -h 260 -o out.jpg image.jpg')
  console.log('    $ imaginary pipeline -j operations.json -o out.jpg image.jpg')
  console.log('    $ imaginary resize -w 300 -o out.jpg http://server.net/image.jpg')
  console.log('    $ imaginary zoom -f 2 -w 300 -o out.jpg http://server.net/image.jpg')
  console.log('    $ imaginary watermark --text "copyright" -o out.jpg http://server.net/image.jpg')
  console.log('')
})

program.parse(process.argv)

function command (action) {
  return function (image, flags) {
    const output = flags.output || path.basename(image)
    const opts = params(flags)

    imaginary(image, flags.server)[action](opts)
      .on('error', exitWithError)
      .pipe(fs.createWriteStream(output))
  }
}

function pipeline (image, flags) {
  const output = flags.output || path.basename(image)
  const opts = params(flags)

  // Load JSON operations from disk
  if (opts.json) {
    opts.operations = JSON.parse(fs.readFileSync(opts.json))
  }

  // Parse operations if a string if given
  if (opts.operations && typeof opts.operations === 'string') {
    opts.operations = JSON.parse(opts.operations)
  }

  // Validate proper input object
  if (!Array.isArray(opts.operations)) {
    return exitWithError('operations must be a JSON list of objects')
  }

  imaginary(image, flags.server).pipeline(opts.operations, opts)
    .on('error', exitWithError)
    .pipe(fs.createWriteStream(output))
}

function params (opts) {
  const buf = {}

  Object.keys(opts).forEach(function (key) {
    if (omit(key)) {
      buf[key] = opts[key]
    }
  })

  return buf
}

function omit (key) {
  const omitFields = ['output', 'server', 'options', 'parent', 'commands']

  return !~omitFields.indexOf(key) &&
    key.charAt(0) !== '_' &&
    key.length > 2
}

function exitWithError (err) {
  console.error('Cannot process image:', err.message || err)
  process.exit(1)
}