'use strict';

var appstore = require('./appstore.js'),
    debug = require('debug')('box:digest'),
    eventlog = require('./eventlog.js'),
    updatechecker = require('./updatechecker.js'),
    mailer = require('./mailer.js'),
    settings = require('./settings.js');

var NOOP_CALLBACK = function (error) { if (error) debug(error); };

exports = module.exports = {
    maybeSend: maybeSend
};

function maybeSend(callback) {
    callback = callback || NOOP_CALLBACK;

    settings.getEmailDigest(function (error, enabled) {
        if (error) return callback(error);

        if (!enabled) {
            debug('Email digest is disabled');
            return callback();
        }

        var updateInfo = updatechecker.getUpdateInfo();
        var pendingAppUpdates = updateInfo.apps || {};
        pendingAppUpdates = Object.keys(pendingAppUpdates).map(function (key) { return pendingAppUpdates[key]; });

        appstore.getSubscription(function (error, result) {
            if (error) debug('Error getting subscription:', error);

            var hasSubscription = result && result.plan.id !== 'free' && result.plan.id !== 'undecided';

            eventlog.getByActionLastWeek(eventlog.ACTION_APP_UPDATE, function (error, appUpdates) {
                if (error) return callback(error);

                eventlog.getByActionLastWeek(eventlog.ACTION_UPDATE, function (error, boxUpdates) {
                    if (error) return callback(error);

                    var info = {
                        hasSubscription: hasSubscription,

                        pendingAppUpdates: pendingAppUpdates,
                        pendingBoxUpdate: updateInfo.box || null,

                        finishedAppUpdates: (appUpdates || []).map(function (e) { return e.data; }),
                        finishedBoxUpdates: (boxUpdates || []).map(function (e) { return e.data; })
                    };

                    if (info.pendingAppUpdates.length || info.pendingBoxUpdate || info.finishedAppUpdates.length || info.finishedBoxUpdates.length) {
                        debug('maybeSend: sending digest email', info);
                        mailer.sendDigest(info);
                    } else {
                        debug('maybeSend: nothing happened, NOT sending digest email');
                    }

                    callback();
                });
            });
        });
    });
}