#!/usr/bin/env node

require('./src/ImageSequencer');
sequencer = ImageSequencer({ ui: false });
var fs = require('fs')
var program = require('commander');
var utils = require('./src/CliUtils')

var saveSequence = require('./src/cli/saveSequence.js')
var installModule = require('./src/cli/installModule.js')
var sequencerSteps = require('./src/cli/sequencerSteps.js')

function exit(message) {
  console.error(message);
  process.exit(1);
}

program
  .version("0.1.0")
  .option("-i, --image [PATH/URL]", "Input image URL")
  .option("-s, --step [step-name]", "Name of the step to be added.")
  .option("-o, --output [PATH]", "Directory where output will be stored.")
  .option("-b, --basic", "Basic mode outputs only final image")
  .option("-c, --config [Object]", "Options for the step")
  .option("--save-sequence [string]", "Name space separated with Stringified sequence")
  .option('--install-module [string]', "Module name space seaprated npm package name")
  .parse(process.argv);

if (program.saveSequence) saveSequence(program, sequencer)

else if (program.installModule) installModule(program, sequencer)

else {
  // Parse step into an array to allow for multiple steps.
  if (!program.step) exit("No steps passed");
  program.step = program.step.split(" ");

  // User must input an image.
  if (!program.image) exit("Can't read file.");

  // User must input an image.
  fs.access(program.image, function(err) {
    if (err) exit("Can't read file.");
  });

  // User must input a step. If steps exist, check that every step is a valid step.
  if (!program.step || !(utils.validateSteps(program.step, sequencer)))
    exit("Please ensure all steps are valid.");

  // If there's no user defined output directory, select a default directory.
  program.output = program.output || "./output/";

  // Set sequencer to log module outputs, if any.
  sequencer.setUI({
    onComplete: function(step) {
      // Get information of outputs.
      step.info = sequencer.modulesInfo(step.name);

      for (var output in step.info.outputs) {
        console.log("[" + program.step + "]: " + output + " = " + step[output]);
      }
    },
    notify: function(msg) {
      console.log('\x1b[36m%s\x1b[0m','🌟  '+msg);
    }
  });

  // Finally, if everything is alright, load the image, add the steps and run the sequencer.
  sequencer.loadImages(program.image, function() {
    console.warn(
      "\x1b[33m%s\x1b[0m",
      "Please wait \n output directory generated will be empty until the execution is complete"
    );

    //Generate the Output Directory
    var outputFilename = program.output.split('/').slice(-1)[0];
    if (outputFilename.includes('.')) {
      // user did give an output filename we have to remove it from dir
      program.output = program.output.split('/').slice(0, -1).join('/');
    }
    else {
      outputFilename = null;
    }

    sequencerSteps(program, sequencer, outputFilename)

  });

}