/*

Jappix - An open social platform
Implementation of XEP-0308: Last Message Correction

-------------------------------------------------

License: AGPL
Author: Valérian Saliou

*/

// Bundle
var Correction = (function () {

    /**
     * Alias of this
     * @private
     */
    var self = {};


    /**
     * @private
     * @param {string} xid
     * @return {boolean}
     */
    self._hasSupport = function(xid) {

        var support = false;

        try {
            if($('#' + hex_md5(xid) + '[data-correction="true"]').size()) {
                support = true;
            }
        } catch(e) {
            Console.error('Correction._hasSupport', e);
        } finally {
            return support;
        }

    };


    /**
     * @private
     * @param {string} xid
     * @return {string}
     */
    self._getLastID = function(xid) {

        var last_id = null;

        try {
            if(self._hasSupport(xid) === true) {
                // Check last message from ourselves
                last_id = $('#' + hex_md5(xid) + ' .content .one-line.user-message[data-mode="me"]:last').attr('data-id') || null;
            }
        } catch(e) {
            Console.error('Correction._getLastID', e);
        } finally {
            return last_id;
        }

    };


    /**
     * @private
     * @param {string} xid
     * @return {string}
     */
    self._getCurrentID = function(xid) {

        var current_id = null;

        try {
            if(self._hasSupport(xid) === true) {
                // Check the ID of the message being edited (if any)
                current_id = $('#' + hex_md5(xid) + ' .message-area').attr('data-correction-current') || null;
            }
        } catch(e) {
            Console.error('Correction._getCurrentID', e);
        } finally {
            return current_id;
        }

    };


    /**
     * @private
     * @param {string} xid
     * @return {object}
     */
    self._getLastMessage = function(xid) {

        var last_message_val = null;
        var last_message_sel = null;

        try {
            if(self._hasSupport(xid) === true) {
                // Check last message from ourselves
                last_message_sel = $('#' + hex_md5(xid) + ' .content .one-line.user-message[data-mode="me"]:last');
                last_message_val = last_message_sel.find('.message-content').text() || null;

                if(last_message_val === null) {
                    last_message_sel = null;
                }
            }
        } catch(e) {
            Console.error('Correction._getLastMessage', e);
        } finally {
            return {
                'value': last_message_val,
                'selector': last_message_sel
            };
        }

    };


    /**
     * @private
     * @param {string} xid
     * @param {object} message_sel
     * @return {undefined}
     */
    self._bindInterface = function(xid, message_sel) {

        try {
            // Add message area elements
            var text_sel = $('#' + hex_md5(xid) + ' .text');

            text_sel.addClass('correction-active');
            text_sel.prepend(
                '<div class="correction-toolbox">' +
                    '<span class="correction-editing">' + Common._e("Editing") + '</span>' +
                    '<a class="correction-cancel" href="#">' + Common._e("Cancel") + '</a>' +
                '</div>'
            );

            // Add message correction marker
            message_sel.addClass('correction-active');
            message_sel.find('.correction-label').remove();
            message_sel.find('.correction-edit').hide();

            message_sel.append(
                '<span class="correction-label">' +
                    Common._e("Being edited") +
                '</span>'
            );

            // Bind click events
            text_sel.find('.correction-cancel').click(function() {
                self.leave(xid);
                return false;
            });
        } catch(e) {
            Console.error('Correction._bindInterface', e);
        }

    };


    /**
     * @private
     * @param {string} xid
     * @param {object} message_sel
     * @return {undefined}
     */
    self._unbindInterface = function(xid, message_sel) {

        try {
            // Remove message area elements
            var text_sel = $('#' + hex_md5(xid) + ' .text');
            text_sel.removeClass('correction-active');
            text_sel.find('.correction-toolbox, .correction-label').remove();

            if(message_sel.size()) {
                message_sel.find('.correction-edit').css('display', '');

                // Remove message correction marker
                message_sel.removeClass('correction-active');
                message_sel.find('.correction-label').remove();
            }
        } catch(e) {
            Console.error('Correction._unbindInterface', e);
        }

    };


    /**
     * @private
     * @param {string} xid
     * @param {string} full_xid
     * @param {string} type
     * @param {string} message_id
     * @param {string} message_body
     * @return {string}
     */
    self._sendStanza = function(xid, full_xid, type, message_id, message_body) {

        var args = {
            'id': null,
            'xhtml': false,
            'message': null
        };

        try {
            var hash = hex_md5(xid);
            var id = genID();
            args.id = id;

            // Initialize message stanza
            var message = new JSJaCMessage();
            args.message = message;

            message.setType(type);
            message.setTo(full_xid);
            message.setID(id);

            // Generates the correct message depending of the choosen style
            var generate_message = Message.generate(message, message_body, hash);
            args.xhtml = (generate_message === 'XHTML');

            // Receipt request
            var receipt_request = Receipts.request(hash);

            if(receipt_request) {
                message.appendNode('request', {'xmlns': NS_URN_RECEIPTS});
            }

            // Chatstate
            message.appendNode('active', {'xmlns': NS_CHATSTATES});

            if(message_id !== null) {
                message.appendNode('replace', {
                    'xmlns': NS_URN_CORRECT,
                    'id': message_id
                });
            }

            con.send(message, Errors.handleReply);
        } catch(e) {
            Console.error('Correction._sendStanza', e);
        } finally {
            return args;
        }

    };


    /**
     * Detects correction mode request (in input)
     * @public
     * @param {string} xid
     * @param {object} input_sel
     * @return {undefined}
     */
    self.detect = function(xid, input_sel) {

        try {
            // Other keys
            if(input_sel.val().match(/^\/correct/) && self.isIn(xid) === false) {
                // Enter correction mode?
                self.enter(xid);
            }
        } catch(e) {
            Console.error('Correction.detect', e);
        }

    };


    /**
     * Enter correction mode (for last message)
     * @public
     * @param {string} xid
     * @return {undefined}
     */
    self.enter = function(xid) {

        try {
            Console.debug('Correction.enter', 'Requested to enter the correction mode with: ' + xid);

            if(self._hasSupport(xid) === true && self.isIn(xid) === false) {
                var last_message = self._getLastMessage(xid);

                if(last_message.value && last_message.selector) {
                    Console.info('Correction.enter', 'Valid last message found for correction mode with: ' + xid);

                    var message_area_sel = $('#' + hex_md5(xid) + ' .message-area');
                    message_area_sel.val(last_message.value);

                    self._bindInterface(
                        xid,
                        last_message.selector
                    );

                    // Focus hack (to get cursor at the end of textarea)
                    message_area_sel.oneTime(10, function() {
                        message_area_sel[0].select();
                        message_area_sel[0].selectionStart = message_area_sel[0].selectionEnd;
                    });
                }
            }
        } catch(e) {
            Console.error('Correction.enter', e);
        }

    };


    /**
     * Leave correction mode
     * @public
     * @param {string} xid
     * @return {undefined}
     */
    self.leave = function(xid) {

        try {
            if(self.isIn(xid) === true) {
                var base_sel = $('#' + hex_md5(xid));
                var active_message_sel = base_sel.find('.content .one-line.user-message.correction-active');

                self._unbindInterface(xid, active_message_sel);

                var message_area_sel = base_sel.find('.message-area');
                message_area_sel.val('');
                message_area_sel.focus();
            }
        } catch(e) {
            Console.error('Correction.leave', e);
        }

    };


    /**
     * Send corrected message
     * @public
     * @param {string} xid
     * @param {string} type
     * @param {string} replacement
     * @return {undefined}
     */
    self.send = function(xid, type, replacement) {

        try {
            if(self._hasSupport(xid) === true) {
                if(self._getLastMessage(xid).value != replacement) {
                    var own_xid = Common.getXID();
                    var hash = hex_md5(xid);
                    var replace_id = self._getLastID(xid);

                    Console.info('Correction.send', 'Sending replacement message for: ' + xid + ' "' + replacement + '" with ID: ' + (replace_id || 'none'));

                    // Send the stanza itself
                    var full_xid = Presence.highestPriority(xid) || xid;
                    var stanza_args = self._sendStanza(
                        xid,
                        full_xid,
                        type,
                        replace_id,
                        replacement
                    );

                    // Update DOM (for chat only)
                    if(type == 'chat') {
                        // Filter the xHTML message (for us!)
                        var replacement_formatted = replacement;

                        if(stanza_args.xhtml) {
                            replacement_formatted = Filter.xhtml(stanza_args.message.getNode());
                        }

                        // Remove old message
                        old_message_sel = $('#' + hash + ' .content .one-line.user-message[data-mode="me"]').filter(function() {
                            return ($(this).attr('data-id') + '') === (replace_id + '');
                        }).filter(':last');

                        var edit_count = old_message_sel.attr('data-edit-count') || 0;
                        edit_count = isNaN(edit_count) ? 0 : parseInt(edit_count, 10);

                        if(type == 'chat') {
                            old_message_sel.remove();
                        }

                        // Display edited message
                        Message.display(
                            'chat',
                            own_xid,
                            hash,
                            Name.getBuddy(own_xid).htmlEnc(),
                            replacement_formatted,
                            DateUtils.getCompleteTime(),
                            DateUtils.getTimeStamp(),
                            'user-message',
                            !stanza_args.xhtml,
                            '',
                            'me',
                            stanza_args.id,
                            undefined,
                            undefined,
                            true,
                            (edit_count + 1)
                        );
                    }
                }
            }
        } catch(e) {
            Console.error('Correction.send', e);
        }

    };


    /**
     * Catches a replace message
     * @public
     * @param {object} message
     * @param {string} hash
     * @param {string} type
     * @return {object}
     */
    self.catch = function(message, hash, type) {

        var edit_results = {
            'has_replace': false,
            'is_edited': false,
            'count': 0,
            'next_count': 0
        };

        try {
            var replace_node = message.getChild('replace', NS_URN_CORRECT);

            if(replace_node) {
                edit_results.has_replace = true;
                var message_edit_id = $(replace_node).attr('id');

                if(typeof message_edit_id != 'undefined') {
                    var message_edit_sel = $('#' + hash + ' .one-line.user-message').filter(function() {
                        var this_sel = $(this);
                        var is_valid_mode = true;

                        if(type == 'chat') {
                            is_valid_mode = true ? this_sel.attr('data-mode') == 'him' : false;
                        }

                        return is_valid_mode && ((this_sel.attr('data-id') + '') === (message_edit_id + ''));
                    }).filter(':last');

                    if(message_edit_sel.size()) {
                        edit_results.count = message_edit_sel.attr('data-edit-count') || 0;
                        edit_results.count = isNaN(edit_results.count) ? 0 : parseInt(edit_results.count, 10);
                        edit_results.next_count = edit_results.count + 1;
                        edit_results.is_edited = true;

                        // Empty group?
                        var message_edit_group_sel = message_edit_sel.parents('.one-group');

                        if(message_edit_group_sel.find('.one-line').size() <= 1) {
                            message_edit_group_sel.remove();
                        } else {
                            message_edit_sel.remove();
                        }
                    }
                }
            }
        } catch(e) {
            Console.error('Correction.catch', e);
        } finally {
            return edit_results;
        }

    };


    /**
     * Returns whether we are in correction mode or not
     * @public
     * @param {string} xid
     * @return {boolean}
     */
    self.isIn = function(xid) {

        var is_in = false;

        try {
            is_in = $('#' + hex_md5(xid) + ' .text').hasClass('correction-active');
        } catch(e) {
            Console.error('Correction.isIn', e);
        } finally {
            return is_in;
        }

    };


    /**
     * Return class scope
     */
    return self;

})();