(function () {
    'use strict';
    var serviceId = 'myMessagesContext';
    var mod = angular.module('myMessages');
    
    mod.factory(serviceId,
        ['config', '$q', '$filter', '$http', myMessagesContext]);

    function myMessagesContext(config, $q, $filter, $http) {
        function handleSuccess(response) {
            return response.data;
        }
        function handleError(response) {
            if (
                !angular.isObject(response.data) ||
                !response.data.message
                ) {

                return $q.reject("An unknown error occurred.");
            }

            // Otherwise, use expected error message.
            return $q.reject(response.data.message);
        }

        return {
            getConversations: getConversations,
            getParticipantsForUser: getParticipantsForUser,
            getUnreadConversations: getUnreadConversations,
            getLatestConversation: getLatestConversation,
            getAllUserTagsForConversations: getAllUserTagsForConversations,
            addTagsToConversation: addTagsToConversation,
            removeTagsFromConversation: removeTagsFromConversation,
            setPinStatusForConversation: setPinStatusForConversation,
            setReadStatusForConversation: setReadStatusForConversation,
            addMessageToConversation: addMessageToConversation,
            createConversation: createConversation
        };

        // gets conversations
        function getConversations() {
            var request = $http({
                method: "get",
                url: config.myMessagesUrl + 'conversations'
            });
            return request.then(handleSuccess, handleError);
        }

        // gets all of the participants for all of a users conversations
        function getParticipantsForUser() {
            var request = $http({
                method: "get",
                url: config.myMessagesUrl + 'conversations/participants'
            });
            return request.then(handleSuccess, handleError);
        }
        
        // gets all of the users unread conversations
        function getUnreadConversations() {
            var request = $http({
                method: "get",
                url: config.myMessagesUrl + 'conversations/unread'
            });
            return request.then(handleSuccess, handleError);
        }
        
        // gets the latest conversation for the user
        function getLatestConversation() {
            var request = $http({
                method: "get",
                url: config.myMessagesUrl + 'conversations/latest'
            });
            return request.then(handleSuccess, handleError);
        }

        // gets all the users tags for all of their conversations
        function getAllUserTagsForConversations() {
            var request = $http({
                method: "get",
                url: config.myMessagesUrl + 'conversations/participant/tags'
            });
            return request.then(handleSuccess, handleError);
        }

        // adds tags to participant model
        function addTagsToConversation(participant) {
            var request = $http({
                method: "post",
                url: config.myMessagesUrl + 'conversations/participant/tag',
                data: participant
            });
            return request.then(handleSuccess, handleError);
        }

        // removes tags from participant model
        function removeTagsFromConversation(participant) {
            var request = $http({
                method: "delete",
                url: config.myMessagesUrl + 'conversations/participant/tag',
                data: participant,
                headers: {
                    'Content-Type': 'application/json'
                }
            });
            return request.then(handleSuccess, handleError);
        }

        // set pin state for conversation for user
        function setPinStatusForConversation(id) {
            var request = $http({
                method: "put",
                url: config.myMessagesUrl + 'conversations/' + id + '/participant/pin'
            });
            return request.then(handleSuccess, handleError);
        }

        // marks read state for all messages in conversation for user
        function setReadStatusForConversation(conversation) {
            var request = $http({
                method: "put",
                url: config.myMessagesUrl + 'conversations/messages/read',
                data: conversation
            });
            return request.then(handleSuccess, handleError);
        }

        // adds message to conversation
        function addMessageToConversation(message) {
            var request = $http({
                method: "post",
                url: config.myMessagesUrl + 'conversations/messages/reply',
                data: message
            });
            return request.then(handleSuccess, handleError);
        }

        // creates a new conversation
        function createConversation(conversation) {
            var request = $http({
                method: "post",
                url: config.myMessagesUrl + 'conversations',
                data: conversation
            });
            return request.then(handleSuccess, handleError);
        }
    }
})();