/*******************************
         Install Task
*******************************/

/*
   Install tasks

   For more notes

   * Runs automatically after npm update (hooks)
   * (NPM) Install - Will ask for where to put semantic (outside pm folder)
   * (NPM) Upgrade - Will look for semantic install, copy over files and update if new version
   * Standard installer runs asking for paths to site files etc

*/

var
  gulp           = require('gulp'),

  // node dependencies
  console        = require('better-console'),
  extend         = require('extend'),
  fs             = require('fs'),
  mkdirp         = require('mkdirp'),
  path           = require('path'),
  runSequence    = require('run-sequence'),

  // gulp dependencies
  chmod          = require('gulp-chmod'),
  del            = require('del'),
  jsonEditor     = require('gulp-json-editor'),
  plumber        = require('gulp-plumber'),
  prompt         = require('gulp-prompt'),
  rename         = require('gulp-rename'),
  replace        = require('gulp-replace'),
  requireDotFile = require('require-dot-file'),
  wrench         = require('wrench'),

  // install config
  install        = require('./config/project/install'),

  // user config
  config         = require('./config/user'),

  // release config (name/title/etc)
  release        = require('./config/project/release'),

  // shorthand
  questions      = install.questions,
  files          = install.files,
  folders        = install.folders,
  regExp         = install.regExp,
  settings       = install.settings,
  source         = install.source
;

// Export install task
module.exports = function (callback) {

var
  currentConfig = requireDotFile('semantic.json'),
  manager       = install.getPackageManager(),
  rootQuestions = questions.root,
  installFolder = false,
  answers
;

console.clear();

/* Test NPM install
manager = {
  name : 'NPM',
  root : path.normalize(__dirname + '/../')
};
*/


/* Don't do end user config if SUI is a sub-module */
if( install.isSubModule() ) {
  console.info('SUI is a sub-module, skipping end-user install');
  return;
}

/*-----------------
    Update SUI
-----------------*/

// run update scripts if semantic.json exists
if(currentConfig && manager.name === 'NPM') {

  var
    updateFolder = path.join(manager.root, currentConfig.base),
    updatePaths  = {
      config       : path.join(manager.root, files.config),
      tasks        : path.join(updateFolder, folders.tasks),
      themeImport  : path.join(updateFolder, folders.themeImport),
      definition   : path.join(currentConfig.paths.source.definitions),
      site         : path.join(currentConfig.paths.source.site),
      theme        : path.join(currentConfig.paths.source.themes),
      defaultTheme : path.join(currentConfig.paths.source.themes, folders.defaultTheme)
    }
  ;

  // duck-type if there is a project installed
  if( fs.existsSync(updatePaths.definition) ) {

    // perform update if new version
    if(currentConfig.version !== release.version) {
      console.log('Updating Semantic UI from ' + currentConfig.version + ' to ' + release.version);

      console.info('Updating ui definitions...');
      wrench.copyDirSyncRecursive(source.definitions, updatePaths.definition, settings.wrench.overwrite);

      console.info('Updating default theme...');
      wrench.copyDirSyncRecursive(source.themes, updatePaths.theme, settings.wrench.merge);
      wrench.copyDirSyncRecursive(source.defaultTheme, updatePaths.defaultTheme, settings.wrench.overwrite);

      console.info('Updating tasks...');
      wrench.copyDirSyncRecursive(source.tasks, updatePaths.tasks, settings.wrench.overwrite);

      console.info('Updating gulpfile.js');
      gulp.src(source.userGulpFile)
        .pipe(plumber())
        .pipe(gulp.dest(updateFolder))
      ;

      // copy theme import
      console.info('Updating theme import file');
      gulp.src(source.themeImport)
        .pipe(plumber())
        .pipe(gulp.dest(updatePaths.themeImport))
      ;

      console.info('Adding new site theme files...');
      wrench.copyDirSyncRecursive(source.site, updatePaths.site, settings.wrench.merge);

      console.info('Updating version...');

      // update version number in semantic.json
      gulp.src(updatePaths.config)
        .pipe(plumber())
        .pipe(rename(settings.rename.json)) // preserve file extension
        .pipe(jsonEditor({
          version: release.version
        }))
        .pipe(gulp.dest(manager.root))
      ;

      console.info('Update complete! Run "\x1b[92mgulp build\x1b[0m" to rebuild dist/ files.');

      return;
    }
    else {
      console.log('Current version of Semantic UI already installed');
      return;
    }

  }
  else {
    console.error('Cannot locate files to update at path: ', updatePaths.definition);
    console.log('Running installer');
  }

}

/*--------------
 Determine Root
---------------*/

// PM that supports Build Tools (NPM Only Now)
if(manager.name == 'NPM') {
  rootQuestions[0].message = rootQuestions[0].message
    .replace('{packageMessage}', 'We detected you are using \x1b[92m' + manager.name + '\x1b[0m. Nice! ')
    .replace('{root}', manager.root)
  ;
  // set default path to detected PM root
  rootQuestions[0].default = manager.root;
  rootQuestions[1].default = manager.root;

  // insert PM questions after "Install Type" question
  Array.prototype.splice.apply(questions.setup, [2, 0].concat(rootQuestions));

  // omit cleanup questions for managed install
  questions.cleanup = [];
}


/*--------------
   Create SUI
---------------*/

gulp.task('run setup', function() {

  // If auto-install is switched on, we skip the configuration section and simply reuse the configuration from semantic.json
  if(install.shouldAutoInstall()) {
    answers = {
      overwrite    : 'yes',
      install      : 'auto',
      useRoot      : true,
      semanticRoot : currentConfig.base
    };
  }
  else {
    return gulp
      .src('gulpfile.js')
      .pipe(prompt.prompt(questions.setup, function(setupAnswers) {
        // hoist
        answers = setupAnswers;
      }))
    ;
  }
});

gulp.task('create install files', function(callback) {

  /*--------------
   Exit Conditions
  ---------------*/

  // if config exists and user specifies not to proceed
  if(answers.overwrite !== undefined && answers.overwrite == 'no') {
    return;
  }
  console.clear();
  if(install.shouldAutoInstall()) {
    console.log('Auto-Installing (Without User Interaction)');
  }
  else {
    console.log('Installing');
  }
  console.log('------------------------------');


  /*--------------
        Paths
  ---------------*/

  var
    installPaths = {
      config            : files.config,
      configFolder      : folders.config,
      site              : answers.site || folders.site,
      themeConfig       : files.themeConfig,
      themeConfigFolder : folders.themeConfig
    }
  ;

  /*--------------
    NPM Install
  ---------------*/

  // Check if PM install
  if(manager && (answers.useRoot || answers.customRoot)) {

    // Set root to custom root path if set
    if(answers.customRoot) {
      if(answers.customRoot === '') {
        console.log('Unable to proceed, invalid project root');
        return;
      }
      manager.root = answers.customRoot;
    }

    // special install paths only for PM install
    installPaths = extend(false, {}, installPaths, {
      definition   : folders.definitions,
      lessImport   : folders.lessImport,
      tasks        : folders.tasks,
      theme        : folders.themes,
      defaultTheme : path.join(folders.themes, folders.defaultTheme),
      themeImport  : folders.themeImport
    });

    // add project root to semantic root
    installFolder = path.join(manager.root, answers.semanticRoot);

    // add install folder to all output paths
    for(var destination in installPaths) {
      if( installPaths.hasOwnProperty(destination) ) {
        // config goes in project root, rest in install folder
        installPaths[destination] = (destination == 'config' || destination == 'configFolder')
          ? path.normalize( path.join(manager.root, installPaths[destination]) )
          : path.normalize( path.join(installFolder, installPaths[destination]) )
        ;
      }
    }

    // create project folders
    try {
      mkdirp.sync(installFolder);
      mkdirp.sync(installPaths.definition);
      mkdirp.sync(installPaths.theme);
      mkdirp.sync(installPaths.tasks);
    }
    catch(error) {
      console.error('NPM does not have permissions to create folders at your specified path. Adjust your folders permissions and run "npm install" again');
    }

    console.log('Installing to \x1b[92m' + answers.semanticRoot + '\x1b[0m');

    console.info('Copying UI definitions');
    wrench.copyDirSyncRecursive(source.definitions, installPaths.definition, settings.wrench.overwrite);

    console.info('Copying UI themes');
    wrench.copyDirSyncRecursive(source.themes, installPaths.theme, settings.wrench.merge);
    wrench.copyDirSyncRecursive(source.defaultTheme, installPaths.defaultTheme, settings.wrench.overwrite);

    console.info('Copying gulp tasks');
    wrench.copyDirSyncRecursive(source.tasks, installPaths.tasks, settings.wrench.overwrite);

    // copy theme import
    console.info('Adding theme files');
    gulp.src(source.themeImport)
      .pipe(plumber())
      .pipe(gulp.dest(installPaths.themeImport))
    ;
    gulp.src(source.lessImport)
      .pipe(plumber())
      .pipe(gulp.dest(installPaths.lessImport))
    ;

    // create gulp file
    console.info('Creating gulpfile.js');
    gulp.src(source.userGulpFile)
      .pipe(plumber())
      .pipe(gulp.dest(installFolder))
    ;

  }


  /*--------------
     Site Theme
  ---------------*/

  // Copy _site templates folder to destination
  if( fs.existsSync(installPaths.site) ) {
    console.info('Site folder exists, merging files (no overwrite)', installPaths.site);
  }
  else {
    console.info('Creating site theme folder', installPaths.site);
  }
  wrench.copyDirSyncRecursive(source.site, installPaths.site, settings.wrench.merge);

  /*--------------
    Theme Config
  ---------------*/

  gulp.task('create theme.config', function() {
    var
      // determine path to site theme folder from theme config
      // force CSS path variable to use forward slashes for paths
      pathToSite   = path.relative(path.resolve(installPaths.themeConfigFolder), path.resolve(installPaths.site)).replace(/\\/g,'/'),
      siteVariable = "@siteFolder   : '" + pathToSite + "/';"
    ;

    // rewrite site variable in theme.less
    console.info('Adjusting @siteFolder to: ', pathToSite + '/');

    if(fs.existsSync(installPaths.themeConfig)) {
      console.info('Modifying src/theme.config (LESS config)', installPaths.themeConfig);
      return gulp.src(installPaths.themeConfig)
        .pipe(plumber())
        .pipe(replace(regExp.siteVariable, siteVariable))
        .pipe(gulp.dest(installPaths.themeConfigFolder))
      ;
    }
    else {
      console.info('Creating src/theme.config (LESS config)', installPaths.themeConfig);
      return gulp.src(source.themeConfig)
        .pipe(plumber())
        .pipe(rename({ extname : '' }))
        .pipe(replace(regExp.siteVariable, siteVariable))
        .pipe(gulp.dest(installPaths.themeConfigFolder))
      ;
    }
  });

  /*--------------
    Semantic.json
  ---------------*/

  gulp.task('create semantic.json', function() {

    var
      jsonConfig = install.createJSON(answers)
    ;

    // adjust variables in theme.less
    if( fs.existsSync(installPaths.config) ) {
      console.info('Extending config file (semantic.json)', installPaths.config);
      return gulp.src(installPaths.config)
        .pipe(plumber())
        .pipe(rename(settings.rename.json)) // preserve file extension
        .pipe(jsonEditor(jsonConfig))
        .pipe(gulp.dest(installPaths.configFolder))
      ;
    }
    else {
      console.info('Creating config file (semantic.json)', installPaths.config);
      return gulp.src(source.config)
        .pipe(plumber())
        .pipe(rename({ extname : '' })) // remove .template from ext
        .pipe(jsonEditor(jsonConfig))
        .pipe(gulp.dest(installPaths.configFolder))
      ;
    }

  });

  runSequence(
    'create theme.config',
    'create semantic.json',
    callback
  );

});

gulp.task('clean up install', function() {

  // Completion Message
  if(installFolder && !install.shouldAutoInstall()) {
    console.log('\n Setup Complete! \n Installing Peer Dependencies. \x1b[0;31mPlease refrain from ctrl + c\x1b[0m... \n After completion navigate to \x1b[92m' + answers.semanticRoot + '\x1b[0m and run "\x1b[92mgulp build\x1b[0m" to build');
    process.exit(0);
  }
  else {
    console.log('');
    console.log('');
  }

  // If auto-install is switched on, we skip the configuration section and simply build the dependencies
  if(install.shouldAutoInstall()) {
    return gulp.start('build');
  }
  else {
    return gulp
      .src('gulpfile.js')
      .pipe(prompt.prompt(questions.cleanup, function(answers) {
        if(answers.cleanup == 'yes') {
          del(install.setupFiles);
        }
        if(answers.build == 'yes') {
          gulp.start('build');
        }
      }))
    ;
  }


});

runSequence(
  'run setup',
  'create install files',
  'clean up install',
  callback
);

};
