%% @author Arthur Clemens <arthurclemens@gmail.com>
%% @copyright 2014-2025 Arthur Clemens
%% @doc TinyMCE Editor module
%% @end

%% Copyright 2014-2025 Arthur Clemens
%%
%% Licensed under the Apache License, Version 2.0 (the "License");
%% you may not use this file except in compliance with the License.
%% You may obtain a copy of the License at
%%
%%     http://www.apache.org/licenses/LICENSE-2.0
%%
%% Unless required by applicable law or agreed to in writing, software
%% distributed under the License is distributed on an "AS IS" BASIS,
%% WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
%% See the License for the specific language governing permissions and
%% limitations under the License.

-module(mod_editor_tinymce).
-moduledoc("
Adds wysiwyg tinyMCE editors to the admin.

The module packs various versions, the version to be used can be selected on the `/admin/modules` page.

Two additional tinyMCE plugins are added:

*   The plugin `zmedia` for selecting images, videos and other media items. In a dialog the centering, size, and optional caption can be choosen. The selected media are added to the page with a `depiction` connection.
*   The plugin `zlink` for adding links (`<a href=\"...\"\\>...</a\\>`) to Zotonic pages in the edited text. The title and URL to the page are automatically added.

Media are added as HTML comments in the body text. The filter [show_media](/id/doc_template_filter_filter_show_media)
is used to translate the HTML comment into a figure or other tags. This is done using the template `_body_media.tpl`,
though other templates can also be used.



Usage
-----

Use TinyMCE by incluyding `_editor.tpl` in your template.

This will, after page load, check all textarea tags with the class `z_editor-init`. These textarea tags are then
augmented with a TinyMCE editor.

Call the JavaScript function `tinymce.triggerSave();` to save all the TinyCME editor instances to their textarea tags. A
wired submit action will save before submitting the form.



Options
-------

All TinyMCE options are set in the global object `tinyInit`. This is done by the `tiny-init.js` file inside the version
of TinyMCE. For example `priv/lib/js/tinymce-5.10.2/tiny-init.js`

This file is included by `editor.tpl`, which should be included in your template if you want to use the editor.

Supply your own `tinyInit` object to change the default settings. This can be done before the include of `_editor.tpl`,
as the `tiny-init.js` will not replace any existing `tinyInit` object.



Stylesheet
----------

The default TinyMCE `tiny_init.js` included by `_editor.tpl` includes a stylesheet from `/lib/css/tinymce-zotonic.css`.

By adding a file `priv/lib/css/tinymce-zotonic.css` in your site or module it is possible to use your own styles for the editor.

Takes care of adding the styles for the images managed by the `zmedia` plugin. The default image styles are:


```css
img.z-tinymce-media {
    position: relative;
    border: 1px solid #667;
    height: auto;
    cursor: pointer;
    width: 270px;
}

img.z-tinymce-media.z-active:hover {
    border: 1px solid #039ed4;
}

img.z-tinymce-media-align-block {
    display: block;
    margin: 1rem 0;
    clear: both;
}

img.z-tinymce-media-align-right {
    float: right;
    margin: 0.5rem;
}

img.z-tinymce-media-align-left {
    float: left;
    margin: 0.5rem;
}

img.z-tinymce-media-size-large {
    width: 90%;
}

img.z-tinymce-media-size-middle {
    width: 50%;
}

img.z-tinymce-media-size-small {
    width: 25%;
}
```

Accepted Events
---------------

Delegate callbacks:

- `event/2` (no explicit `#postback/ #submit/ #postback_notify` message clauses documented in this module).


").
-author("Arthur Clemens <arthurclemens@gmail.com>").

-mod_title("TinyMCE Editor").
-mod_description("Rich Text Editor using TinyMCE.").
-mod_prio(500).
-mod_config([
        #{
            name => version,
            type => string,
            default => "newest",
            description => "The TinyMCE version to use. Either the version number or 'newest'."
        }
    ]).

-export([
    event/2
    ]).

-include_lib("zotonic_core/include/zotonic.hrl").

event(#z_msg_v1{data=Data}, Context) ->
    handle_cmd(proplists:get_value(<<"cmd">>, Data), Data, Context).

handle_cmd(<<"zmedia-props">>, Data, Context) ->
    {<<"options">>, Options} = proplists:lookup(<<"options">>, Data),
    {<<"id">>, Id} = proplists:lookup(<<"id">>, Data),
    z_render:dialog(
        ?__("Media Properties", Context),
        "_tinymce_dialog_zmedia_props.tpl",
        [
            {id, m_rsc:rid(Id, Context)},
            {options, Options},
            {level, 5}
        ],
        Context).