module.exports = function (grunt) {

   var autoStartBrowsers = ['Chrome', 'Firefox', 'Safari'];

   var STREAM_SOURCE_PORT = 4567;

   // NB: source files are order sensitive
   var OBOE_BROWSER_SOURCE_FILES = [
      'build/version.js'                
   ,  'src/LICENCE.js'                
   ,  'src/functional.js'                
   ,  'src/util.js'                    
   ,  'src/lists.js'                    
   ,  'src/libs/clarinet.js'               
   ,  'src/clarinetListenerAdaptor.js'
   ,  'src/parseResponseHeaders.browser.js'
   ,  'src/streamingHttp.browser.js'
   ,  'src/jsonPathSyntax.js'
   ,  'src/ascent.js'            
   ,  'src/incrementalContentBuilder.js'            
   ,  'src/jsonPath.js'
   ,  'src/singleEventPubSub.js'
   ,  'src/pubSub.js'
   ,  'src/events.js'
   ,  'src/patternAdapter.js'   
   ,  'src/instanceApi.js'   
   ,  'src/instanceController.js'
   ,  'src/wire.js'
   ,  'src/publicApi.js'
   ];
   
   var OBOE_NODE_SOURCE_FILES = [
      'build/version.js'   
   ,  'src/functional.js'                
   ,  'src/util.js'                    
   ,  'src/lists.js'                                   
   ,  'src/clarinetListenerAdaptor.js'
   ,  'src/streamingHttp.node.js'
   ,  'src/jsonPathSyntax.js'
   ,  'src/ascent.js'   
   ,  'src/incrementalContentBuilder.js'            
   ,  'src/jsonPath.js'
   ,  'src/singleEventPubSub.js'   
   ,  'src/pubSub.js'
   ,  'src/events.js'
   ,  'src/patternAdapter.js'      
   ,  'src/instanceApi.js'   
   ,  'src/instanceController.js'
   ,  'src/wire.js'
   ,  'src/publicApi.js'
   ];   
   
   var FILES_TRIGGERING_KARMA = [
      'src/**/*.js', 
      'test/specs/*.spec.js', 
      'test/libs/*.js'
   ];
     
   grunt.initConfig({

      pkg:grunt.file.readJSON("package.json")
      
   ,  clean: ['dist/*.js', 'build/*.js']
      
   ,  concat: {
         browser:{         
            src: OBOE_BROWSER_SOURCE_FILES,
            dest: 'build/oboe-browser.concat.js'
         },
         node:{         
            src: OBOE_NODE_SOURCE_FILES,
            dest: 'build/oboe-node.concat.js'
         }         
      }
      
   ,  wrap: {
         browserPackage: {
            src: 'build/oboe-browser.concat.js',
            dest: '.',
            wrapper: [
               '// This file is the concatenation of many js files. \n' +
               '// See https://github.com/jimhigson/oboe.js for the raw source\n' +
               // having a local undefined, window, Object etc allows slightly better minification:                    
               '(function  (window, Object, Array, Error, JSON, undefined ) {\n'
               
                  // source code here
                
            ,     '\n\n;' +          
                                  
                  'if ( typeof define === "function" && define.amd ) {' +
                     'define( "oboe", [], function () { return oboe; } );' +
                  '} else {' +
                     'window.oboe = oboe;' +
                  '}' +
               '})(window, Object, Array, Error, JSON);'
            ]
         },
                  
         nodePackage: {
            src: 'build/oboe-node.concat.js',
            dest: '.',
            wrapper: [
               '// this file is the concatenation of several js files. See https://github.com/jimhigson/oboe-browser.js/tree/master/src ' +
                   'for the unconcatenated source\n' +
                    
               'module.exports = (function  () {\n' + 
                  'var clarinet = require("clarinet");\n'
                  
                  // source code here
                                        
            ,  '\n\n;return oboe;})();'
            ]
         }         
      }
      
                       
   ,  uglify: {
         build:{
            files:{
               'build/oboe-browser.min.js': 'build/oboe-browser.concat.js'
            }
         }
      }
      
   ,  karma: {
         options:{            
            singleRun: true,
            proxies: {
               '/testServer'   : 'http://localhost:' + STREAM_SOURCE_PORT   
            },         
            // test results reporter to use
            // possible values: 'dots', 'progress', 'junit'
            reporters : ['progress'],
                        
            // enable / disable colors in the output (reporters and logs)
            colors : true            
         }
         
      ,  
         'precaptured-dev': {
            // for doing a single test run with already captured browsers during development.
            // this is good for running tests in browsers karma can't easily start such as
            // IE running inside a Windows VM on a unix dev environment                
            browsers: [],     
            configFile: 'test/unit.conf.js',
            singleRun: 'true'            
         }
      ,
         'single-dev': {
            browsers: autoStartBrowsers,
            configFile: 'test/unit.conf.js'
         }
      ,
         'single-concat': {
            browsers: autoStartBrowsers,
            configFile: 'test/concat.conf.js'      
         }  
      ,  
         'single-minified': {
            browsers: autoStartBrowsers,
            configFile: 'test/min.conf.js'
         }
         
      ,  
         'single-amd': {
            browsers: autoStartBrowsers,
            configFile: 'test/amd.conf.js'
         }         
         
      ,  
         'single-browser-http': {
            browsers: autoStartBrowsers,
            configFile: 'test/http.conf.js'
         }         
         
      ,  
         'persist': {
            // for setting up a persistent karma server.
            // To start the server, the task is:
            //    karma:persist 
            // To run these, the task is: 
            //    karma:persist:run
            configFile: 'test/unit.conf.js',           
            browsers: [], 
            singleRun:false,
            background:true
         }   
      }
      
   ,  copy: {
         browserDist: {
            files: [
               {src: ['build/oboe-browser.min.js'],    dest: 'dist/oboe-browser.min.js'}
            ,  {src: ['build/oboe-browser.concat.js'], dest: 'dist/oboe-browser.js'    }
            ]
         },
         nodeDist: {
            files: [
               {src: ['build/oboe-node.concat.js'],    dest: 'dist/oboe-node.js'}
            ]
         }         
      }      
      
   ,  exec:{
         // these might not go too well on Windows :-) - get Cygwin.
         reportMinifiedSize:{
            command: "echo minified size is `wc -c < dist/oboe-browser.min.js` bytes" 
         },
         reportMinifiedAndGzippedSize:{
            command: "echo Size after gzip is `gzip --best --stdout dist/oboe-browser.min.js | wc -c` bytes - max 5120"
         },
         createGitVersionJs:{
            command: "echo \"// `git describe`\" > build/version.js"
         }
      }
      
   ,  watch:{
         karma:{
            files:FILES_TRIGGERING_KARMA,
            tasks:['karma:persist:run']
         },
                           
         // like above but reports the file size. This is good for 
         // watching while developing to make sure it doesn't get
         // too big. Doesn't run tests against minified.
         karmaAndSize:{
            files: FILES_TRIGGERING_KARMA,
            tasks:[
               'karma:persist:run',
               'browser-build',               
               'dist-sizes']
         },
         
         // like above but reports the file size. This is good for 
         // watching while developing to make sure it doesn't get
         // too big. Doesn't run tests against minified.
         testNode:{
            files: FILES_TRIGGERING_KARMA,
            tasks:[ 
               'node-build-run']
         },         
         
         restartStreamSourceAndRunTests:{
            // this fails at the moment because start-stream-source
            // fails if run more than once - the port is taken.
            files: ['test/streamsource.js'],
            tasks: ['start-stream-source', 'karma:persist:run']
         }         
      }
                 
   ,  concurrent:{
         watchDev: {
            tasks:[ 'watch:karmaAndSize', 'watch:restartStreamSourceAndRunTests' ],
            options:{
               logConcurrentOutput: true
            }
         }
      }
      
   });

   require('matchdep').filterDev('grunt-*').forEach(grunt.loadNpmTasks);

   var streamSource;
   
   grunt.registerTask('start-stream-source', function () {
      grunt.log.ok('do we have a streaming source already?', !!streamSource);
   
      // if we previously loaded the streamsource, stop it to let the new one in:
      if( streamSource ) {
         grunt.log.ok('there seems to be a streaming server already, let\'s stop it');
         streamSource.stop();
      }
         
      streamSource = require('./test/streamsource.js');
      streamSource.start(STREAM_SOURCE_PORT, grunt);
   });

   grunt.registerTask("jasmine_node_oboe", "Runs jasmine-node.", function() {
   
      require('jasmine-node').executeSpecsInFolder({
            
         "specFolders":[process.cwd() + '/test/specs/'], 
         "isVerbose":true, 
         "showColors":true, 
         "teamcity":false, 
         "useRequireJs":false, 
         "regExpSpec":/oboe\.(?:integration|performance)\.spec\.(js)$/, 
         "junitreport":{"report":false, "savePath":"./reports/", "useDotNotation":true, "consolidate":true}, 
         "includeStackTrace":true, 
         "growl":false,
         onComplete: this.async()
         
      });
   });   

   // change the auto-starting browsers so that future tests will use
   // phantomjs instead of actual browsers. Can do: 
   //    grunt headless-mode default
   // to run without any actual browsers
   grunt.registerTask('headless-mode', function(){
      autoStartBrowsers.length = 0;
      autoStartBrowsers.push('PhantomJS');
   })
      
   grunt.registerTask('test-start-server',   [
      'karma:persist'
   ]);
   
   grunt.registerTask('test-run',   [
      'karma:persist:run'
   ]);
   
   grunt.registerTask('dist-sizes',   [
      'exec:reportMinifiedAndGzippedSize'
   ]);
            
   grunt.registerTask('node-build',      [
      'exec:createGitVersionJs',   
      'concat:node', 
      'wrap:nodePackage',
      'copy:nodeDist'
   ]);

   grunt.registerTask('node-build-test',      [
      'node-build',
      'jasmine_node_oboe'
   ]);
      
   grunt.registerTask('node',      [
      'start-stream-source',
      'node-build-test'
   ]);   

   grunt.registerTask('browser-build',      [
      'exec:createGitVersionJs',
      'concat:browser', 
      'concat:node', 
      'wrap:browserPackage', 
      'uglify',
      'copy:browserDist'   
   ]);
         
   grunt.registerTask('browser-build-test',      [
      'karma:single-dev', 
      'karma:single-browser-http',
      'browser-build',
      'karma:single-concat',                                         
      'karma:single-minified',     
      'karma:single-amd'   
   ]);
   
   grunt.registerTask('build',      [
      'browser-build',
      'node-build'      
   ]);      
   
   // build and run just the integration tests.
   grunt.registerTask('build-integration-test',      [
      'build',   
      'start-stream-source',
      'karma:single-concat',
      'jasmine_node_oboe',
      'dist-sizes'
   ]);
   
   grunt.registerTask('default',      [
   
      'clear',   
      'clean',
      'start-stream-source',
      
      'browser-build-test',     

      'node-build-test',
      
      'dist-sizes'                                                            
   ]);
   
   

   // browser-test-auto-run or node-test-auto-run
   //
   // The most useful for developing. Start this task, capture some browsers
   // (unless node) then edit the code. Tests will be run as the code is 
   // saved.
   grunt.registerTask('browser-test-auto-run',   [
      'start-stream-source',
      'karma:persist',
      'concurrent:watchDev'       
   ]);
   grunt.registerTask('node-test-auto-run',   [
      'start-stream-source',
      'watch:testNode'       
   ]);   
};