#!/usr/bin/env node

require('./src/ImageSequencer');
sequencer = ImageSequencer({ui: false});
var Spinner = require('ora')

var program = require('commander');
var readlineSync = require('readline-sync');

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')
.parse(process.argv);

// 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.
require('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 || !validateSteps(program.step))
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]);
    }
    
  }
  
});

// 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
  require('./src/CliUtils').makedir(program.output,()=>{
    console.log("Files will be exported to \""+program.output+"\"");
    
    if(program.basic) console.log("Basic mode is enabled, outputting only final image")
    
    // Iterate through the steps and retrieve their inputs.
    program.step.forEach(function(step){
      var options = Object.assign({}, sequencer.modulesInfo(step).inputs);
      
      // If inputs exists, print to console.
      if (Object.keys(options).length) {
        console.log("[" + step + "]: Inputs");
      }
      
      // If inputs exists, print them out with descriptions.
      Object.keys(options).forEach(function(input) {
        // The array below creates a variable number of spaces. This is done with (length + 1). 
        // The extra 4 that makes it (length + 5) is to account for the []: characters
        console.log(new Array(step.length + 5).join(' ') + input + ": " + options[input].desc);
      });
      
      if(program.config){
        try{
          program.config = JSON.parse(program.config);
          console.log(`The parsed options object: `, program.config);
        }
        catch(e){
          console.error('\x1b[31m%s\x1b[0m',`Options(Config) is not a not valid JSON Fallback activate`);
          program.config = false;
          console.log(e);
        }
      }
      if(program.config && validateConfig(program.config,options)){
        console.log("Now using Options object");
        Object.keys(options).forEach(function (input) {
          options[input] = program.config[input];
        })
      }
      else{
        // If inputs exist, iterate through them and prompt for values.
        Object.keys(options).forEach(function(input) {
          var value = readlineSync.question("[" + step + "]: Enter a value for " + input + " (" + options[input].type + ", default: " + options[input].default + "): ");
          options[input] = value;
        });
      }
      // Add the step and its inputs to the sequencer.
      sequencer.addSteps(step, options);
    });
    
    var spinnerObj = Spinner('Your Image is being processed..').start();
    
    // Run the sequencer.
    sequencer.run(spinnerObj,function(){

      // Export all images or final image as binary files.
      sequencer.exportBin(program.output,program.basic);

      //check if spinner was not overriden stop it
      if(!spinnerObj.overrideFlag) {
        spinnerObj.succeed()
        console.log(`\nDone!!`)
      }
      
    });
    
  });
  
});

// Takes an array of steps and checks if they are valid steps for the sequencer.
function validateSteps(steps) {
  
  // Assume all are valid in the beginning. 
  var valid = true;
  steps.forEach(function(step) {
    // If any step in the array is not valid (not a property of modulesInfo), set valid to false.
    if (!sequencer.modulesInfo().hasOwnProperty(step)) {
      valid = false;
    }
  });
  
  // Return valid. (If all of the steps are valid properties, valid will have remained true).
  return valid;
}

//Takes config and options object and checks if all the keys exist in config 
function validateConfig(config_,options_){
  options_ = Object.keys(options_);
  if (
    (function(){
      for(var input in options_){
        if(!config_[options_[input]]){
          console.error('\x1b[31m%s\x1b[0m',`Options Object does not have the required details "${options_[input]}" not specified. Fallback case activated`);
          return false;
        } 
      }
    })()
    == false)
    return false;
    else
    return true;
  }