From 083e37a1736ab4c87aa87132fc0d72cabf6e9a00 Mon Sep 17 00:00:00 2001
From: Seth Trowbridge <seth111@gmail.com>
Date: Tue, 6 Jun 2023 22:48:45 -0400
Subject: [PATCH] example started

---
 example/deno.json |  6 ++++
 hmr/hmr.tsx       | 76 ++++++++++++++++++++++++++++++++++++++++++++++
 hmr/react.tsx     | 77 +++++++++++++++++++++++++++++++++++++++++++++++
 serve.tsx         |  4 +++
 4 files changed, 163 insertions(+)
 create mode 100644 example/deno.json
 create mode 100644 hmr/hmr.tsx
 create mode 100644 hmr/react.tsx

diff --git a/example/deno.json b/example/deno.json
new file mode 100644
index 0000000..16d929c
--- /dev/null
+++ b/example/deno.json
@@ -0,0 +1,6 @@
+{
+    "imports":
+    {
+        "react":"https://esm.sh/preact/compat"
+    }
+}
\ No newline at end of file
diff --git a/hmr/hmr.tsx b/hmr/hmr.tsx
new file mode 100644
index 0000000..198981e
--- /dev/null
+++ b/hmr/hmr.tsx
@@ -0,0 +1,76 @@
+
+let reloads = 0;
+const listeners = new Map() as Map<string, Array<(module:unknown)=>void>>;
+const socket:WebSocket = new WebSocket("ws://"+document.location.host);
+socket.addEventListener('message', (event) =>
+{
+    let handlers = listeners.get(event.data)??[];
+    reloads++;
+    Promise.all(
+        handlers.map(handler=>
+        {
+            return import(event.data+"?reload="+reloads)
+            .then(updatedModule=>handler(updatedModule));
+        })
+    ).then(()=>HMR.update());
+});
+const socketTimer = setInterval(()=>{socket.send("ping")}, 1000);
+
+export const FileListen =(inPath:string, inHandler:()=>void)=>
+{
+    const members = listeners.get(inPath)??[];
+    members.push(inHandler);
+    listeners.set(inPath, members);
+};
+
+const HMR = {
+    reloads:0,
+    registered: new Map() as Map<string, ()=>void>,
+    states: new Map(),
+    statesOld: new Map(),
+    wireframe: false,
+    onChange(key:string, value:()=>void):void
+    {
+        this.registered.set(key, value);
+    },
+    update()
+    {
+        this.reloads++;
+        this.registered.forEach(handler=>handler());
+        this.registered.clear();
+        this.statesOld = this.states;
+        this.states = new Map();
+        this.echoState();
+    },
+    echoState()
+    {
+        let output = [];
+        for(const[key, val] of HMR.statesOld)
+        {
+            output[key] = val.state+"--"+val.reload;
+        }
+        console.log(output);
+        output = [];
+        for(const[key, val] of HMR.states)
+        {
+            output[key] = val.state+"--"+val.reload;
+        }
+        console.log(output);
+    }
+};
+
+export {HMR};
+
+export const MapAt =(inMap, inIndex)=>
+{
+    let index = 0;
+    for(const kvp of inMap)
+    {
+        if(index == inIndex)
+        {
+            return kvp;
+        }
+        index++;
+    }
+    return false;
+};
\ No newline at end of file
diff --git a/hmr/react.tsx b/hmr/react.tsx
new file mode 100644
index 0000000..3b013cd
--- /dev/null
+++ b/hmr/react.tsx
@@ -0,0 +1,77 @@
+import * as ReactParts from "react-original";
+import { HMR, MapAt } from "./hmr.tsx";
+
+const H = ReactParts.createElement;
+
+const ProxyElement = (props)=>
+{
+    const id = ReactParts.useId();
+    const [stateGet, stateSet] = ReactParts.useState(0);
+    ReactParts.useEffect(()=>HMR.onChange(id, ()=>stateSet(stateGet+1)));
+
+    const child = H(...props.__args);
+
+    if(HMR.wireframe)
+    {
+        return H("div", {style:{padding:"10px", border:"2px solid red"}},
+            H("p", null, stateGet),
+            child
+        );
+    }
+    else
+    {
+        return child;
+    }
+};
+
+const ProxyCreate =(...args)=>
+{
+    return typeof args[0] != "string" ? H(ProxyElement, {__args:args, ...args[1]}) : H(...args);
+};
+
+const ProxyState =(arg)=>
+{
+    const id = ReactParts.useId();
+    const trueArg = arg;
+
+    // does statesOld have an entry for this state? use that instead of the passed arg
+    const check =  MapAt(HMR.statesOld, HMR.states.size);
+    if(check)
+    {
+        arg = check[1].state;
+        console.info(`BOOTING with ${arg}`);
+    }
+
+    const lastKnowReloads = HMR.reloads;
+    const [stateGet, stateSet] = ReactParts.useState(arg);
+    ReactParts.useEffect(()=>{
+        return ()=>{
+            if(HMR.reloads == lastKnowReloads)
+            {
+                // this is a switch/ui change, not a HMR reload change
+                const oldState = MapAt(HMR.statesOld, HMR.states.size-1);
+                HMR.statesOld.set(oldState[0], {...oldState[1], state:trueArg});
+            }
+            HMR.states.delete(id);
+        }
+    }, []);
+
+    if(!HMR.states.has(id))
+    {
+        HMR.states.set(id, {state:arg, set:stateSet, reload:HMR.reloads});
+    }
+    
+    function proxySetter (arg)
+    {
+        //console.log("state spy update", id, arg);
+        HMR.states.set(id, {state:arg, set:stateSet, reload:HMR.reloads});
+        return stateSet(arg);
+    }
+    return [stateGet, proxySetter];
+
+};
+
+export * from "react-original";
+export { ProxyCreate as createElement, ProxyState as useState };
+export const isProxy = true;
+export default {...ReactParts.default, createElement:ProxyCreate, useState:ProxyState, isProxy:true};
\ No newline at end of file
diff --git a/serve.tsx b/serve.tsx
index ab5fc68..860e4c3 100644
--- a/serve.tsx
+++ b/serve.tsx
@@ -84,6 +84,10 @@ HTTP.serve(async(req: Request)=>
 {
     const url:URL = new URL(req.url);
 
+    if(url.pathname.endsWith("/"))
+    {
+        
+    }
     if(url.pathname === Configure.Reset)
     {
         return new Response(`cache cleared (${Transpile.Clear()} items)`);