/**
 * @author Rafael Ostertag <rafael.ostertag@math.uzh.ch>
 */

/* global $ */

if (!QfqNS) {
    var QfqNS = {};
}

(function (n) {
    'use strict';

    n.QfqForm = function (formId, submitTo, deleteUrl) {
        this.formId = formId;
        this.submitTo = submitTo;
        this.deleteUrl = deleteUrl;
        this.form = new n.Form(this.formId);
        this.bsTabs = null;

        this.getSaveButton().addClass("disabled").attr("disabled", "disabled");

        this.form.addChangeHandler(this.changeHandler.bind(this));
        this.form.addResetHandler(this.resetHandler.bind(this));
        this.form.addSubmitSuccessHandler(this.submitSuccessDispatcher.bind(this));
        this.form.addSubmitFailureHandler(this.submitFailureHandler.bind(this));

        this.getSaveButton().click(this.handleSaveClick.bind(this));
        this.getCloseButton().click(this.handleCloseClick.bind(this));
        this.getNewButton().click(this.handleNewClick.bind(this));
        this.getDeleteButton().click(this.handleDeleteClick.bind(this));
    };

    n.QfqForm.prototype.setBsTabs = function (bsTabs) {
        this.bsTabs = bsTabs;
    };

    /**
     * @private
     */
    n.QfqForm.prototype.handleSaveClick = function () {
        QfqNS.Log.debug("save click");
        // First, remove all validation states, in case a previous submit has set a validation state, thus we're not
        // stockpiling them.
        this.clearAllValidationStates();
        this.form.submitTo(this.submitTo);
    };

    /**
     * @private
     */
    n.QfqForm.prototype.handleCloseClick = function () {
        if (this.form.getFormChanged()) {
            var alert = new QfqNS.Alert("You have unsaved changes. Do you want to close?", "warning", "yesnosave");
            var that = this;
            alert.addSaveButtonHandler(function () {
                that.form.submitTo(that.submitTo);
            });
            alert.addOkButtonHandler(function () {
                window.history.back();
            });
            alert.show();
        } else {
            window.history.back();
        }
    };

    /**
     * @private
     */
    n.QfqForm.prototype.handleNewClick = function () {
        QfqNS.Log.debug("new click");
    };

    /**
     * @private
     */
    n.QfqForm.prototype.handleDeleteClick = function () {
        QfqNS.Log.debug("delete click");
        $.post(this.deleteUrl)
            .done(this.ajaxDeleteSuccessDispatcher.bind(this))
            .fail(this.ajaxDeleteFailureHandler.bind(this));
    };

    /**
     *
     * @param data
     * @param textStatus
     * @param jqXHR
     *
     * @private
     */
    n.QfqForm.prototype.ajaxDeleteSuccessDispatcher = function (data, textStatus, jqXHR) {
        if (!data.status) {
            throw new Error("No 'status' property 'data'");
        }

        switch (data.status) {
            case "error":
                this.handleLogicDeleteError(data);
                break;
            case "success":
                this.handleDeleteSuccess(data);
                break;
            default:
                throw new Error("Status '" + data.status + "' unknown.");
        }
    };

    /**
     *
     * @param data
     *
     * @private
     */
    n.QfqForm.prototype.handleDeleteSuccess = function (data) {
        if (!data.redirect || data.redirect === "client") {
            window.history.back();
            return;
        }

        if (data.redirect === "no") {
            var alert = new QfqNS.Alert("redirect=='no' not allowed", "error");
            alert.show();
            return;
        }

        if (data.redirect === "url" || data['redirect-url']) {
            window.location = data['redirect-url'];
            return;
        }
    };

    /**
     *
     * @param data
     *
     * @private
     */
    n.QfqForm.prototype.handleLogicDeleteError = function (data) {
        if (!data.message) {
            throw Error("Status is 'error' but required 'message' attribute is missing.");
        }
        var alert = new QfqNS.Alert(data.message, "error");
        alert.show();
    };

    /**
     *
     * @param form {QfqNS.QfqForm}
     *
     * @private
     */
    n.QfqForm.prototype.changeHandler = function (form) {
        this.getSaveButton().removeClass("disabled");
        this.getSaveButton().addClass("alert-warning");
        this.getSaveButton().removeAttr("disabled");
    };

    /**
     *
     * @param form {QfqNS.QfqForm}
     *
     * @private
     */
    n.QfqForm.prototype.resetHandler = function (form) {
        this.getSaveButton().removeClass("alert-warning");
        this.getSaveButton().addClass("disabled");
        this.getSaveButton().attr("disabled", "disabled");
    };

    /**
     *
     * @returns {jQuery|HTMLElement}
     *
     * @private
     */
    n.QfqForm.prototype.getSaveButton = function () {
        return $("#save-button");
    };

    /**
     *
     * @returns {jQuery|HTMLElement}
     *
     * @private
     */
    n.QfqForm.prototype.getCloseButton = function () {
        return $("#close-button");
    };

    /**
     *
     * @returns {jQuery|HTMLElement}
     *
     * @private
     */
    n.QfqForm.prototype.getDeleteButton = function () {
        return $("#delete-button");
    };

    /**
     *
     * @returns {jQuery|HTMLElement}
     *
     * @private
     */
    n.QfqForm.prototype.getNewButton = function () {
        return $("#new-button");
    };

    /**
     *
     * @param jqXHR
     * @param textStatus
     * @param errorThrown
     *
     * @private
     */
    n.QfqForm.prototype.submitFailureHandler = function (form, textStatus, jqXHR, errorThrown) {
        this.showAjaxError(errorThrown);
    };

    /**
     *
     * @param jqXHR
     * @param textStatus
     * @param errorThrown
     *
     * @private
     */
    n.QfqForm.prototype.ajaxDeleteFailureHandler = function (jqXHR, textStatus, errorThrown) {
        this.showAjaxError(errorThrown);
    };

    n.QfqForm.prototype.showAjaxError = function (errorThrown) {
        var alert = new QfqNS.Alert("Error:<br> " +
            errorThrown, "error");
        alert.show();
    };


    /**
     * @private
     */
    n.QfqForm.prototype.submitSuccessDispatcher = function (form, data, textStatus) {
        if (!data.status) {
            throw new Error("No 'status' property in 'data'");
        }

        switch (data.status) {
            case "error":
                this.handleLogicSubmitError(form, data);
                break;
            case "success":
                this.handleSubmitSuccess(form, data);
                break;
            default:
                throw new Error("Status '" + data.status + "' unknown.");
        }

    };

    /**
     *
     * @param form
     * @param data
     *
     * @private
     */
    n.QfqForm.prototype.handleLogicSubmitError = function (form, data) {
        if (!data.message) {
            throw Error("Status is 'error' but required 'message' attribute is missing.");
        }
        var alert = new QfqNS.Alert(data.message, "error");
        alert.show();

        if (data["field-name"] && this.bsTabs) {
            var tabId = this.bsTabs.getContainingTabIdForFormControl(data["field-name"]);
            if (tabId) {
                this.bsTabs.activateTab(tabId);
            }

            this.setValidationState(data["field-name"], "error");
            this.setHelpBlockValidationMessage(data["field-name"], data["field-message"]);
        }
    };

    /**
     *
     * @param form
     * @param data
     *
     * @private
     */
    n.QfqForm.prototype.handleSubmitSuccess = function (form, data) {
        QfqNS.Log.debug('Reset form state');
        form.resetFormChanged();

        if (!data.redirect || data.redirect === "no") {
            if (data.message) {
                var alert = new QfqNS.Alert(data.message);
                alert.timeout = 3000;
                alert.show();
            }
            return;
        }

        if (data.redirect === "client") {
            window.history.back();
            return;
        }

        if (data.redirect === "url" || data['redirect-url']) {
            window.location = data['redirect-url'];
            return;
        }

    };

    n.QfqForm.prototype.getFormGroupByControlName = function (formControlName) {
        var $formControl = $("[name=" + formControlName + "]");
        if ($formControl.length === 0) {
            QfqNS.Log.debug("QfqForm.setValidationState(): unable to find form control with name '" + formControlName + "'");
            return null;
        }

        var iterator = $formControl[0];
        while (iterator !== null) {
            var $iterator = $(iterator);
            if ($iterator.hasClass('form-group')) {
                return $iterator;
            }

            iterator = iterator.parentElement;
        }

        return null;
    };

    n.QfqForm.prototype.setValidationState = function (formControlName, state) {
        var $formGroup = this.getFormGroupByControlName(formControlName);
        if ($formGroup) {
            $formGroup.addClass("has-" + state);
        }
    };

    n.QfqForm.prototype.resetValidationState = function (formControlName) {
        var $formGroup = this.getFormGroupByControlName(formControlName);
        $formGroup.removeClass("has-warning");
        $formGroup.removeClass("has-error");
        $formGroup.removeClass("has-success");
    };

    n.QfqForm.prototype.clearAllValidationStates = function () {
        $('.has-warning,.has-error,.has-success').removeClass("has-warning has-error has-success");
        $('[data-qfq=validation-message]').remove();
    };

    n.QfqForm.prototype.setHelpBlockValidationMessage = function (formControlName, text) {
        var $formGroup = this.getFormGroupByControlName(formControlName);
        if (!$formGroup) {
            return;
        }
        var $helpBlockColumn;
        var $formGroupSubDivs = $formGroup.find("div");
        if ($formGroupSubDivs.length < 3) {
            $helpBlockColumn = $("<div>").addClass("col-md-4");
            $formGroup.append($helpBlockColumn);
        } else {
            $helpBlockColumn = $($formGroupSubDivs[2]);
        }

        $helpBlockColumn.append(
            $("<p>")
                .addClass("help-block")
                .attr("data-qfq", "validation-message")
                .append(text)
        );
    };

})(QfqNS);