define(function(require) {
    'use strict';

    var appController = require('js/app-controller'),
        download = require('js/util/download'),
        angular = require('angular'),
        str = require('js/app-config').string,
        emailDao, invitationDao, outbox, pgp, keychain;

    //
    // Controller
    //

    var ReadCtrl = function($scope) {

        emailDao = appController._emailDao;
        invitationDao = appController._invitationDao;
        outbox = appController._outboxBo;
        pgp = appController._pgp;
        keychain = appController._keychain;

        // set default value so that the popover height is correct on init
        $scope.keyId = 'No key found.';

        $scope.state.read = {
            open: false,
            toggle: function(to) {
                this.open = to;
            }
        };

        $scope.getKeyId = function(address) {
            $scope.keyId = 'Searching...';
            keychain.getReceiverPublicKey(address, function(err, pubkey) {
                if (err) {
                    $scope.onError(err);
                    return;
                }

                if (!pubkey) {
                    $scope.keyId = 'User has no key. Click to invite.';
                    $scope.$apply();
                    return;
                }

                var fpr = pgp.getFingerprint(pubkey.publicKey);
                var formatted = fpr.slice(32);

                $scope.keyId = 'PGP key: ' + formatted;
                $scope.$apply();
            });
        };

        $scope.$watch('state.mailList.selected', function(mail) {
            if (!mail) {
                return;
            }

            // display sender security status
            mail.from.forEach(checkPublicKey);
            // display recipient security status
            mail.to.forEach(checkPublicKey);
            // display recipient security status
            Array.isArray(mail.cc) && mail.cc.forEach(checkPublicKey);
        });

        function checkPublicKey(user) {
            user.secure = undefined;

            if (!keychain) {
                return;
            }

            keychain.getReceiverPublicKey(user.address, function(err, pubkey) {
                if (err) {
                    $scope.onError(err);
                    return;
                }

                if (pubkey && pubkey.publicKey) {
                    user.secure = true;
                } else {
                    user.secure = false;
                }

                $scope.$apply();
            });
        }

        $scope.download = function(attachment) {
            // download file to disk if content is available
            if (attachment.content) {
                download.createDownload({
                    content: attachment.content,
                    filename: attachment.filename,
                    contentType: attachment.mimeType
                });
                return;
            }

            var folder = $scope.state.nav.currentFolder;
            var email = $scope.state.mailList.selected;
            emailDao.getAttachment({
                folder: folder,
                uid: email.uid,
                attachment: attachment
            }, $scope.onError);
        };

        $scope.invite = function(user) {
            // only invite non-pgp users
            if (user.secure) {
                return;
            }

            $scope.keyId = 'Sending invitation...';

            var sender = emailDao._account.emailAddress,
                recipient = user.address;

            invitationDao.invite({
                recipient: recipient,
                sender: sender
            }, function(err) {
                if (err) {
                    $scope.onError(err);
                    return;
                }

                var invitationMail = {
                    from: [{
                        address: sender
                    }],
                    to: [{
                        address: recipient
                    }],
                    cc: [],
                    bcc: [],
                    subject: str.invitationSubject,
                    body: str.invitationMessage
                };

                // send invitation mail
                outbox.put(invitationMail, $scope.onError);
            });
        };
    };

    //
    // Directives
    //

    var ngModule = angular.module('read', []);

    ngModule.directive('replySelection', function() {
        return function(scope, elm) {
            var popover, visible;

            popover = angular.element(document.querySelector('.reply-selection'));
            visible = false;

            elm.on('touchstart click', appear);
            elm.parent().parent().on('touchstart click', disappear);
            popover.on('touchstart click', disappear);

            function appear(e) {
                e.preventDefault();
                e.stopPropagation();

                visible = true;

                // set popover position
                var top = elm[0].offsetTop;
                var left = elm[0].offsetLeft;
                var width = elm[0].offsetWidth;
                var height = elm[0].offsetHeight;

                popover[0].style.transition = 'opacity 0.1s linear';
                popover[0].style.top = (top + height) + 'px';
                popover[0].style.left = (left + width / 2 - popover[0].offsetWidth / 2) + 'px';
                popover[0].style.opacity = '1';
            }

            function disappear() {
                if (!visible) {
                    return;
                }

                popover[0].style.transition = 'opacity 0.25s linear, top 0.25s step-end, left 0.25s step-end';
                popover[0].style.opacity = '0';
                popover[0].style.top = '-9999px';
                popover[0].style.left = '-9999px';
                visible = false;
            }
        };
    });

    ngModule.directive('frameLoad', function($timeout, $window) {
        return function(scope, elm) {
            var iframe = elm[0];

            scope.$watch('state.read.open', function(open) {
                if (open) {
                    // trigger rendering of iframe
                    // otherwise scale to fit would not compute correct dimensions on mobile
                    displayText(scope.state.mailList.selected ? scope.state.mailList.selected.body : undefined);
                    displayHtml(scope.state.mailList.selected ? scope.state.mailList.selected.html : undefined);
                }
            });

            $window.addEventListener('resize', scaleToFit);

            iframe.onload = function() {
                // set listeners
                scope.$watch('state.mailList.selected.body', displayText);
                scope.$watch('state.mailList.selected.html', displayHtml);
                // display initial message body
                scope.$apply();
            };

            function displayText(body) {
                var mail = scope.state.mailList.selected;
                if ((mail && mail.html) || (mail && mail.encrypted && !mail.decrypted)) {
                    return;
                }

                // send text body for rendering in iframe
                iframe.contentWindow.postMessage({
                    text: body
                }, '*');

                $timeout(scaleToFit, 0);
            }

            function displayHtml(html) {
                if (!html) {
                    return;
                }

                // if there are image tags in the html?
                var hasImages = /<img[^>]+\bsrc=['"][^'">]+['"]/ig.test(html);
                scope.showImageButton = hasImages;

                iframe.contentWindow.postMessage({
                    html: html,
                    removeImages: hasImages // avoids doing unnecessary work on the html
                }, '*');

                // only add a scope function to reload the html if there are images
                if (hasImages) {
                    // reload WITH images
                    scope.displayImages = function() {
                        scope.showImageButton = false;
                        iframe.contentWindow.postMessage({
                            html: html,
                            removeImages: false
                        }, '*');
                    };
                }

                $timeout(scaleToFit, 0);
            }

            // transform scale iframe (necessary on iOS) to fit container width
            function scaleToFit() {
                var parentWidth = elm.parent().width();
                var w = elm.width();
                var scale = '';

                if (w > parentWidth) {
                    scale = parentWidth / w;
                    scale = 'scale(' + scale + ',' + scale + ')';
                }

                elm.css({
                    '-webkit-transform-origin': '0 0',
                    'transform-origin': '0 0',
                    '-webkit-transform': scale,
                    'transform': scale
                });
            }
        };
    });

    return ReadCtrl;
});