var Q                       = require('q');
var debug                   = require('debug')('ylt:runner');

var phantomasWrapper        = require('./tools/phantomas/phantomasWrapper');
var colorDiff               = require('./tools/colorDiff');
var domAccessAgregator      = require('./tools/domAccessAgregator');
var mediaQueriesChecker     = require('./tools/mediaQueriesChecker');
var redownload              = require('./tools/redownload/redownload');
var rulesChecker            = require('./rulesChecker');
var scoreCalculator         = require('./scoreCalculator');


var Runner = function(params) {
    'use strict';

    var deferred = Q.defer();

    // The pivot format
    var data = {
        params: params,
        toolsResults: {}
    };

    // Execute Phantomas first
    phantomasWrapper.execute(data)

    // For the progress bar
    .progress(function(event) {
        if (event === 'domReady') {
            deferred.notify({
                estimatedProgress: 0.15,
                milestone: 'domReady'
            });
        }
        if (event === 'domComplete') {
            deferred.notify({
                estimatedProgress: 0.25,
                milestone: 'domComplete'
            });
        }
    })

    .then(function(phantomasResults) {
        // For the progress bar
        deferred.notify({
            estimatedProgress: 0.4,
            milestone: 'phantomas'
        });

        data.toolsResults.phantomas = phantomasResults;

        // Mix all DOM Access metrics together
        data = domAccessAgregator.agregate(data);

        // Compare colors
        data = colorDiff.compareAllColors(data);

        // Check media queries
        data = mediaQueriesChecker.analyzeMediaQueries(data);

        // Redownload every file
        return redownload.recheckAllFiles(data)

        .progress(function(redownloadedProgress) {
            deferred.notify({
                estimatedProgress: 0.4 + redownloadedProgress * 0.55,
                milestone: 'phantomas'
            });
        });

    })

    .then(function(data) {

        // For the progress bar
        deferred.notify({
            estimatedProgress: 0.99,
            milestone: 'redownload'
        });

        // Fix: don't display Unicode ranges if the module is not present in Phantomas
        if (!data.toolsResults.phantomas.metrics.differentCharacters) {
            delete data.toolsResults.redownload.metrics.unusedUnicodeRanges;
            delete data.toolsResults.redownload.offenders.unusedUnicodeRanges;
        }

        // Rules checker
        var policies = require('./metadata/policies');
        data.rules = rulesChecker.check(data, policies);


        // Scores calculator
        var scoreProfileGeneric = require('./metadata/scoreProfileGeneric.json');
        data.scoreProfiles = {
            generic : scoreCalculator.calculate(data, scoreProfileGeneric, true)
        };


        // Calculate "If you fix this issue, your new score is..." on each rule
        debug('Calculate "If you fix this issue..." scores');
        Object.keys(data.rules).forEach(function(ruleName) {
            // Save current values
            var oldScore = data.rules[ruleName].score;
            var oldAbnormalityScore = data.rules[ruleName].abnormalityScore;
            // Simulate a 100/100 score on a specific rule
            data.rules[ruleName].score = 100;
            data.rules[ruleName].abnormalityScore = 0;
            // Calculate new score
            data.rules[ruleName].globalScoreIfFixed = scoreCalculator.calculate(data, scoreProfileGeneric, false).globalScore;
            // Revert values
            data.rules[ruleName].score = oldScore;
            data.rules[ruleName].abnormalityScore = oldAbnormalityScore;
        });
        debug('Calculating is finished');


        if (data.toolsResults.phantomas.offenders.blockedRequests) {
            data.blockedRequests = data.toolsResults.phantomas.offenders.blockedRequests;
        }

        // Report WordPress detection
        if (data.toolsResults.redownload.metrics.isWordPress === true) {
            data.frameworks = {isWordPress: true};
        }

        // Finished!
        deferred.resolve(data);
    })

    .fail(function(err) {
        debug('Run failed');
        debug(err);

        deferred.reject(err);
    });


    return deferred.promise;
};

module.exports = Runner;