/* globals Rkns */
/* Saves the Full JSON at each modification */

Rkns.mtdcJsonIO = function(_renkan, _opts) {
    var _proj = _renkan.project;
    if (typeof _opts.http_method === 'undefined') {
        _opts.http_method = 'PUT';
    }
    var _load = function() {
        _proj.set({
            loadingStatus : true
        });
        Rkns.$.getJSON(_opts.url, function(_data) {
            _renkan.dataloader.load(_data);
            _renkan.setCurrentUser(_opts.user_id, _opts.user_name);
            _proj.set({
                loadingStatus : false
            });
            _proj.set({
                saveStatus : 0
            });
            _proj.on('add:nodes add:edges add:users add:views', function(_model) {
                _model.on('change remove', function() {
                    _thrSave();
                });
                _thrSave();
            });
            _proj.on('change', function() {
                if (!(_proj.changedAttributes.length === 1 && _proj
                      .hasChanged('saveStatus'))) {
                    _thrSave();
                }
            });
            _proj.get('nodes').each(function(_node) {
                _node.on('change remove', function() {
                    _thrSave();
                });
            });
            _proj.get('edges').each(function(_edge) {
                _edge.on('change remove', function() {
                    _thrSave();
                });
            });
            _proj.get('users').each(function(_user) {
                _user.on('change remove', function() {
                    _thrSave();
                });
            });

        }).fail(function(jqXHR, textStatus) {
            _showErrorModal(jqXHR, textStatus);
        });
    };
    var _save = function() {
        _proj.set({
            saveStatus : 2
        });
        var _data = _proj.toJSON();
        if (!_renkan.read_only) {
            Rkns.$.ajax({
                type : _opts.http_method,
                url : _opts.url,
                contentType : 'application/json',
                data : JSON.stringify(_data),
                success : function(data) {
                    _proj.set({
                        saveStatus : 0,
                        updated : data.updated
                    });
                },
                error: function (jqXHR, textStatus, errorThrown) {
                    _showErrorModal(jqXHR, textStatus, errorThrown);
                }
            });
        }

    };
    var _thrSave = Rkns._.debounce(_save, 1000);


    Rkns.$('#renkanErrorReload').on('click', function(){
        location.reload();
    });

    var errorModal = document.getElementById('renkanErrorModal');
    var _showErrorModal = function(jqXHR) {
        errorModal.style.display = 'block';
        switch(jqXHR.status){
        case 400:
            var jsonResp = JSON.parse(jqXHR.responseText);
            if(jsonResp.hasOwnProperty('validation_timestamp')){
                document.getElementById('400Error_timestamp').style.display = 'block';
            }
            else {
                Rkns.$('#400Error_other').append(jqXHR.responseText);
                document.getElementById('400Error_other').style.display = 'block';
            }
            break;
        case 403:
            document.getElementById('403Error').style.display = 'block';
            break;
        case 404:
            document.getElementById('404Error').style.display = 'block';
            break;
        case 500:
            Rkns.$('#500Error').append(jqXHR.responseText);
            document.getElementById('500Error').style.display = 'block';
            break;
        case 503:
            document.getElementById('503Error').style.display = 'block';
            break;
        }
    };

    _load();
};