lustre

-module(lustre@server_component).
-compile([no_auto_import, nowarn_unused_vars, nowarn_unused_function, nowarn_nomatch, inline]).
-define(FILEPATH, "src/lustre/server_component.gleam").
-export([element/2, script/0, route/1, method/1, include/2, subject/1, pid/1, register_subject/1, deregister_subject/1, register_callback/1, deregister_callback/1, emit/2, select/1, runtime_message_decoder/0, client_message_to_json/1]).
-export_type([transport_method/0]).

-if(?OTP_RELEASE >= 27).
-define(MODULEDOC(Str), -moduledoc(Str)).
-define(DOC(Str), -doc(Str)).
-else.
-define(MODULEDOC(Str), -compile([])).
-define(DOC(Str), -compile([])).
-endif.

?MODULEDOC(
    " Server components are an advanced feature that allows you to run components\n"
    " or full Lustre applications on the server. Updates are broadcast to a small\n"
    " (10kb!) client runtime that patches the DOM and events are sent back to the\n"
    " server component in real-time.\n"
    "\n"
    " ```text\n"
    " -- SERVER -----------------------------------------------------------------\n"
    "\n"
    "                  Msg                            Element(Msg)\n"
    " +--------+        v        +----------------+        v        +------+\n"
    " |        | <-------------- |                | <-------------- |      |\n"
    " | update |                 | Lustre runtime |                 | view |\n"
    " |        | --------------> |                | --------------> |      |\n"
    " +--------+        ^        +----------------+        ^        +------+\n"
    "         #(model, Effect(msg))  |        ^          Model\n"
    "                                |        |\n"
    "                                |        |\n"
    "                    DOM patches |        | DOM events\n"
    "                                |        |\n"
    "                                v        |\n"
    "                        +-----------------------+\n"
    "                        |                       |\n"
    "                        | Your WebSocket server |\n"
    "                        |                       |\n"
    "                        +-----------------------+\n"
    "                                |        ^\n"
    "                                |        |\n"
    "                    DOM patches |        | DOM events\n"
    "                                |        |\n"
    "                                v        |\n"
    " -- BROWSER ----------------------------------------------------------------\n"
    "                                |        ^\n"
    "                                |        |\n"
    "                    DOM patches |        | DOM events\n"
    "                                |        |\n"
    "                                v        |\n"
    "                            +----------------+\n"
    "                            |                |\n"
    "                            | Client runtime |\n"
    "                            |                |\n"
    "                            +----------------+\n"
    " ```\n"
    "\n"
    " > **Note**: Lustre's server component runtime is separate from your application's\n"
    " > WebSocket server. You're free to bring your own stack, connect multiple\n"
    " > clients to the same Lustre instance, or keep the application alive even when\n"
    " > no clients are connected.\n"
    "\n"
    " Lustre server components run next to the rest of your backend code, your\n"
    " services, your database, etc. Real-time applications like chat services, games,\n"
    " or components that can benefit from direct access to your backend services\n"
    " like an admin dashboard or data table are excellent candidates for server\n"
    " components.\n"
    "\n"
    " ## Examples\n"
    "\n"
    " Server components are a new feature in Lustre and we're still working on the\n"
    " best ways to use them and show them off. Here are a few examples we've\n"
    " developed so far:\n"
    "\n"
    " - [Basic setup](https://github.com/lustre-labs/lustre/tree/main/examples/06-server-components/01-basic-setup)\n"
    "\n"
    " - [Custom attributes and events](https://github.com/lustre-labs/lustre/tree/main/examples/06-server-components/02-attributes-and-events)\n"
    "\n"
    " - [Decoding DOM events](https://github.com/lustre-labs/lustre/tree/main/examples/06-server-components/03-event-include)\n"
    "\n"
    " - [Connecting more than one client](https://github.com/lustre-labs/lustre/tree/main/examples/06-server-components/04-multiple-clients)\n"
    "\n"
    " - [Adding publish-subscribe](https://github.com/lustre-labs/lustre/tree/main/examples/06-server-components/05-publish-subscribe)\n"
    "\n"
    " ## Getting help\n"
    "\n"
    " If you're having trouble with Lustre or not sure what the right way to do\n"
    " something is, the best place to get help is the [Gleam Discord server](https://discord.gg/Fm8Pwmy).\n"
    " You could also open an issue on the [Lustre GitHub repository](https://github.com/lustre-labs/lustre/issues).\n"
    "\n"
).

-type transport_method() :: web_socket | server_sent_events | polling.

-file("src/lustre/server_component.gleam", 143).
?DOC(
    " Render the server component custom element. This element acts as the thin\n"
    " client runtime for a server component running remotely. There are a handful\n"
    " of attributes you should provide to configure the client runtime:\n"
    "\n"
    " - [`route`](#route) is the URL your server component should connect to. This\n"
    "   **must** be provided before the client runtime will do anything. The route\n"
    "   can be a relative URL, in which case it will be resolved against the current\n"
    "   page URL.\n"
    "\n"
    " - [`method`](#method) is the transport method the client runtime should use.\n"
    "   This defaults to `WebSocket` enabling duplex communication between the client\n"
    "   and server runtime. Other options include `ServerSentEvents` and `Polling`\n"
    "   which are unidirectional transports.\n"
    "\n"
    " > **Note**: the server component runtime bundle must be included and sent to\n"
    " > the client for this to work correctly. You can do this by including the\n"
    " > JavaScript bundle found in Lustre's `priv/static` directory or by inlining\n"
    " > the script source directly with the [`script`](#script) element below.\n"
).
-spec element(
    list(lustre@vdom@vattr:attribute(YRY)),
    list(lustre@vdom@vnode:element(YRY))
) -> lustre@vdom@vnode:element(YRY).
element(Attributes, Children) ->
    lustre@element:element(
        <<"lustre-server-component"/utf8>>,
        Attributes,
        Children
    ).

-file("src/lustre/server_component.gleam", 155).
?DOC(
    " Inline the server component client runtime as a `<script>` tag. Where possible\n"
    " you should prefer serving the pre-built client runtime from Lustre's `priv/static`\n"
    " directory, but this inline script can be useful for development or scenarios\n"
    " where you don't control the HTML document.\n"
).
-spec script() -> lustre@vdom@vnode:element(any()).
script() ->
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n={onConnect:()=>{this.#u=!0,this.dispatchEvent(new CustomEvent(\"lustre:connect\"),{detail:{route:this.#n,method:this.#e}})},onMessage:o=>{this.messageReceivedCallback(o)},onClose:()=>{this.#u=!1,this.dispatchEvent(new CustomEvent(\"lustre:close\",{detail:{route:this.#n,method:this.#e}}))}};switch(this.#e){case\"ws\":this.#t=new _e(this.#n,n);break;case\"sse\":this.#t=new me(this.#n,n);break;case\"polling\":this.#t=new xe(this.#n,n);break}}async#x(){for(;this.#i.length;)this.#i.pop().remove(),this.#r.firstChild.remove();this.#i=await bt(this.#r)}#p(e,t=[]){let r={};(e.type===\"input\"||e.type===\"change\")&&t.push(\"target.value\"),e.type===\"submit\"&&t.push(\"detail.formData\");for(let n of t){let o=n.split(\".\");for(let i=0,l=e,c=r;i<o.length;i++){if(i===o.length-1){c[o[i]]=l[o[i]];break}c=c[o[i]]??={},l=l[o[i]]}}return r}},_e=class{#r;#e;#n=!1;#t=[];#i;#s;#o;constructor(e,{onConnect:t,onMessage:r,onClose:n}){this.#r=e,this.#e=new WebSocket(this.#r),this.#i=t,this.#s=r,this.#o=n,this.#e.onopen=()=>{this.#i()},this.#e.onmessage=({data:o})=>{try{this.#s(JSON.parse(o))}finally{this.#t.length?this.#e.send(JSON.stringify({kind:Z,messages:this.#t})):this.#n=!1,this.#t=[]}},this.#e.onclose=()=>{this.#o()}}send(e){if(this.#n||this.#e.readyState!==WebSocket.OPEN){this.#t.push(e);return}else this.#e.send(JSON.stringify(e)),this.#n=!0}close(){this.#e.close()}},me=class{#r;#e;#n;#t;#i;constructor(e,{onConnect:t,onMessage:r,onClose:n}){this.#r=e,this.#e=new EventSource(this.#r),this.#n=t,this.#t=r,this.#i=n,this.#e.onopen=()=>{this.#n()},this.#e.onmessage=({data:o})=>{try{this.#t(JSON.parse(o))}catch{}}}send(e){}close(){this.#e.close(),this.#i()}},xe=class{#r;#e;#n;#t;#i;#s;constructor(e,{onConnect:t,onMessage:r,onClose:n,...o}){this.#r=e,this.#t=t,this.#i=r,this.#s=n,this.#e=o.interval??5e3,this.#o().finally(()=>{this.#t(),this.#n=setInterval(()=>this.#o(),this.#e)})}async send(e){}close(){clearInterval(this.#n),this.#s()}#o(){return fetch(this.#r).then(e=>e.json()).then(this.#i).catch(console.error)}};customElements.define(\"lustre-server-component\",he);export{he as ServerComponent};"/utf8>>
    ).

-file("src/lustre/server_component.gleam", 170).
?DOC(
    " The `route` attribute tells the client runtime what route it should use to\n"
    " set up the WebSocket connection to the server. Whenever this attribute is\n"
    " changed (by a clientside Lustre app, for example), the client runtime will\n"
    " destroy the current connection and set up a new one.\n"
).
-spec route(binary()) -> lustre@vdom@vattr:attribute(any()).
route(Path) ->
    lustre@attribute:attribute(<<"route"/utf8>>, Path).

-file("src/lustre/server_component.gleam", 176).
?DOC("\n").
-spec method(transport_method()) -> lustre@vdom@vattr:attribute(any()).
method(Value) ->
    lustre@attribute:attribute(<<"method"/utf8>>, case Value of
            web_socket ->
                <<"ws"/utf8>>;

            server_sent_events ->
                <<"sse"/utf8>>;

            polling ->
                <<"polling"/utf8>>
        end).

-file("src/lustre/server_component.gleam", 213).
?DOC(
    " Properties of a JavaScript event object are typically not serialisable. This\n"
    " means if we want to send them to the server we need to make a copy of any\n"
    " fields we want to decode first.\n"
    "\n"
    " This attribute tells Lustre what properties to include from an event. Properties\n"
    " can come from nested fields by using dot notation. For example, you could include\n"
    " the\n"
    " `id` of the target `element` by passing `[\"target.id\"]`.\n"
    "\n"
    " ```gleam\n"
    " import gleam/dynamic/decode\n"
    " import lustre/element.{type Element}\n"
    " import lustre/element/html\n"
    " import lustre/event\n"
    " import lustre/server_component\n"
    "\n"
    " pub fn custom_button(on_click: fn(String) -> msg) -> Element(msg) {\n"
    "   let handler = fn(event) {\n"
    "     use id <- decode.at([\"target\", \"id\"], decode.string)\n"
    "     decode.success(on_click(id))\n"
    "   }\n"
    "\n"
    "   html.button(\n"
    "     [server_component.include([\"target.id\"]), event.on(\"click\", handler)],\n"
    "     [html.text(\"Click me!\")],\n"
    "   )\n"
    " }\n"
    " ```\n"
).
-spec include(lustre@vdom@vattr:attribute(YSK), list(binary())) -> lustre@vdom@vattr:attribute(YSK).
include(Event, Properties) ->
    case Event of
        {event, _, _, _, _, _, _, _, _} ->
            {event,
                erlang:element(2, Event),
                erlang:element(3, Event),
                erlang:element(4, Event),
                Properties,
                erlang:element(6, Event),
                erlang:element(7, Event),
                erlang:element(8, Event),
                erlang:element(9, Event)};

        _ ->
            Event
    end.

-file("src/lustre/server_component.gleam", 233).
?DOC(
    " Recover the `Subject` of the server component runtime so that it can be used\n"
    " in supervision trees or passed to other processes. If you want to hand out\n"
    " different `Subject`s to send messages to your application, take a look at the\n"
    " [`select`](#select) effect.\n"
    "\n"
    " > **Note**: this function is not available on the JavaScript target.\n"
).
-spec subject(lustre:runtime(YSO)) -> gleam@erlang@process:subject(lustre@runtime@server@runtime:message(YSO)).
subject(Runtime) ->
    gleam@function:identity(Runtime).

-file("src/lustre/server_component.gleam", 245).
?DOC(
    " Recover the `Pid` of the server component runtime so that it can be used in\n"
    " supervision trees or passed to other processes. If you want to hand out\n"
    " different `Subject`s to send messages to your application, take a look at the\n"
    " [`select`](#select) effect.\n"
    "\n"
    " > **Note**: this function is not available on the JavaScript target.\n"
).
-spec pid(lustre:runtime(any())) -> gleam@erlang@process:pid_().
pid(Runtime) ->
    Pid@1 = case gleam@erlang@process:subject_owner(subject(Runtime)) of
        {ok, Pid} -> Pid;
        _assert_fail ->
            erlang:error(#{gleam_error => let_assert,
                        message => <<"Pattern match failed, no pattern matched the value."/utf8>>,
                        file => <<?FILEPATH/utf8>>,
                        module => <<"lustre/server_component"/utf8>>,
                        function => <<"pid"/utf8>>,
                        line => 246,
                        value => _assert_fail,
                        start => 22574,
                        'end' => 22634,
                        pattern_start => 22585,
                        pattern_end => 22592})
    end,
    Pid@1.

-file("src/lustre/server_component.gleam", 262).
?DOC(
    " Register a `Subject` to receive messages and updates from Lustre's server\n"
    " component runtime. The process that owns this will be monitored and the\n"
    " subject will be gracefully removed if the process dies.\n"
    "\n"
    " > **Note**: if you are developing a server component for the JavaScript runtime,\n"
    " > you should use [`register_callback`](#register_callback) instead.\n"
).
-spec register_subject(
    gleam@erlang@process:subject(lustre@runtime@transport:client_message(YSW))
) -> lustre@runtime@server@runtime:message(YSW).
register_subject(Client) ->
    {client_registered_subject, Client}.

-file("src/lustre/server_component.gleam", 272).
?DOC(
    " Deregister a `Subject` to stop receiving messages and updates from Lustre's\n"
    " server component runtime. The subject should first have been registered with\n"
    " [`register_subject`](#register_subject) otherwise this will do nothing.\n"
).
-spec deregister_subject(
    gleam@erlang@process:subject(lustre@runtime@transport:client_message(YTA))
) -> lustre@runtime@server@runtime:message(YTA).
deregister_subject(Client) ->
    {client_deregistered_subject, Client}.

-file("src/lustre/server_component.gleam", 286).
?DOC(
    " Register a callback to be called whenever the server component runtime\n"
    " produces a message. Avoid using anonymous functions with this function, as\n"
    " they cannot later be removed using [`deregister_callback`](#deregister_callback).\n"
    "\n"
    " > **Note**: server components running on the Erlang target are **strongly**\n"
    " > encouraged to use [`register_subject`](#register_subject) instead of this\n"
    " > function.\n"
).
-spec register_callback(
    fun((lustre@runtime@transport:client_message(YTE)) -> nil)
) -> lustre@runtime@server@runtime:message(YTE).
register_callback(Callback) ->
    {client_registered_callback, Callback}.

-file("src/lustre/server_component.gleam", 300).
?DOC(
    " Deregister a callback to be called whenever the server component runtime\n"
    " produces a message. The callback to remove is determined by function equality\n"
    " and must be the same function that was passed to [`register_callback`](#register_callback).\n"
    "\n"
    " > **Note**: server components running on the Erlang target are **strongly**\n"
    " > encouraged to use [`register_subject`](#register_subject) instead of this\n"
    " > function.\n"
).
-spec deregister_callback(
    fun((lustre@runtime@transport:client_message(YTH)) -> nil)
) -> lustre@runtime@server@runtime:message(YTH).
deregister_callback(Callback) ->
    {client_deregistered_callback, Callback}.

-file("src/lustre/server_component.gleam", 316).
?DOC(
    " Instruct any connected clients to emit a DOM event with the given name and\n"
    " data. This lets your server component communicate to the frontend the same way\n"
    " any other HTML elements do: you might emit a `\"change\"` event when some part\n"
    " of the server component's state changes, for example.\n"
    "\n"
    " This is a real DOM event and any JavaScript on the page can attach an event\n"
    " listener to the server component element and listen for these events.\n"
).
-spec emit(binary(), gleam@json:json()) -> lustre@effect:effect(any()).
emit(Event, Data) ->
    lustre@effect:event(Event, Data).

-file("src/lustre/server_component.gleam", 339).
?DOC(
    " On the Erlang target, Lustre's server component runtime is an OTP\n"
    " [actor](https://hexdocs.pm/gleam_otp/gleam/otp/actor.html) that can be\n"
    " communicated with using the standard process API and the `Subject` returned\n"
    " when starting the server component.\n"
    "\n"
    " Sometimes, you might want to hand a different `Subject` to a process to restrict\n"
    " the type of messages it can send or to distinguish messages from different\n"
    " sources from one another. The `select` effect creates a fresh `Subject` each\n"
    " time it is run. By returning a `Selector` you can teach the Lustre server\n"
    " component runtime how to listen to messages from this `Subject`.\n"
    "\n"
    " The `select` effect also gives you the dispatch function passed to `effect.from`.\n"
    " This is useful in case you want to store the provided `Subject` in your model\n"
    " for later use. For example you may subscribe to a pubsub service and later use\n"
    " that same `Subject` to unsubscribe.\n"
    "\n"
    " > **Note**: This effect does nothing on the JavaScript runtime, where `Subject`s\n"
    " > and `Selector`s don't exist, and is the equivalent of returning `effect.none()`.\n"
).
-spec select(
    fun((fun((YTM) -> nil), gleam@erlang@process:subject(any())) -> gleam@erlang@process:selector(YTM))
) -> lustre@effect:effect(YTM).
select(Sel) ->
    lustre@effect:select(Sel).

-file("src/lustre/server_component.gleam", 352).
?DOC(
    " The server component client runtime sends JSON-encoded messages for the server\n"
    " runtime to execute. Because your own WebSocket server sits between the two\n"
    " parts of the runtime, you need to decode these actions and pass them to the\n"
    " server runtime yourself.\n"
).
-spec runtime_message_decoder() -> gleam@dynamic@decode:decoder(lustre@runtime@server@runtime:message(any())).
runtime_message_decoder() ->
    gleam@dynamic@decode:map(
        lustre@runtime@transport:server_message_decoder(),
        fun(Field@0) -> {client_dispatched_message, Field@0} end
    ).

-file("src/lustre/server_component.gleam", 368).
?DOC(
    " Encode a message you can send to the client runtime to respond to. The server\n"
    " component runtime will send messages to any registered clients to instruct\n"
    " them to update their DOM or emit events, for example.\n"
    "\n"
    " Because your WebSocket server sits between the two parts of the runtime, you\n"
    " need to encode these actions and send them to the client runtime yourself.\n"
).
-spec client_message_to_json(lustre@runtime@transport:client_message(any())) -> gleam@json:json().
client_message_to_json(Message) ->
    lustre@runtime@transport:client_message_to_json(Message).