SimpleChat: Simple histogram/repeatMatching driven garbageTrimming, Settings UI, Streaming mode, OpenAi Compat (Model, Authorization Bearer), Save/Restore session, Auto Settings UI (#7548)

* SimpleChat:DU:BringIn local helper js modules using importmap

Use it to bring in a simple trim garbage at end logic, which is
used to trim received response.

Also given that importmap assumes esm / standard js modules, so
also global variables arent implicitly available outside the
modules. So add it has a member of document for now

* SimpleChat:DU: Add trim garbage at end in loop helper

* SimpleChat:DU:TrimGarbage if unable try skip char and retry

* SimpleChat:DU: Try trim using histogram based info

TODO: May have to add max number of uniq chars in histogram at
end of learning phase.

* SimpleChat:DU: Switch trim garbage hist based to maxUniq simple

Instead of blindly building histogram for specified substring
length, and then checking if any new char within specified min
garbage length limit, NOW exit learn state when specified maxUniq
chars are found. Inturn there should be no new chars with in
the specified min garbage length required limit.

TODO: Need to track char classes like alphabets, numerals and
special/other chars.

* SimpleChat:DU: Bring in maxType to the mix along with maxUniq

Allow for more uniq chars, but then ensure that a given type of
char ie numerals or alphabets or other types dont cross the
specified maxType limit. This allows intermixed text garbage
to be identified and trimmed.

* SimpleChat:DU: Cleanup debug log messages

* SimpleChat:UI: Move html ui base helpers into its own module

* SimpleChat:DU:Avoid setting frequence/Presence penalty

Some models like llama3 found to try to be over intelligent by
repeating garbage still, but by tweaking the garbage a bit so that
it is not exactly same. So avoid setting these penalties and let
the model's default behaviour work out, as is.

Also the simple minded histogram based garbage trimming from end,
works to an extent, when the garbage is more predictable and
repeatative.

* SimpleChat:UI: Add and use a para-create-append helper

Also update the config params dump to indicate that now one needs
to use document to get hold of gMe global object, this is bcas of
moving to module type js.

Also add ui.mjs to importmap

* SimpleChat:UI: Helper to create bool button and use it wrt settings

* SimpleChat:UI: Add Select helper and use it wrt ChatHistoryInCtxt

* SimpleChat:UI:Select: dict-name-value, value wrt default, change

Take a dict/object of name-value pairs instead of just names.
Inturn specify the actual value wrt default, rather than the
string representing that value.

Trap the needed change event rather than click wrt select.

* SimpleChat:UI: Add Div wrapped label+element helpers

Move settings related elements to use the new div wrapped ones.

* SimpleChat:UI:Add settings button and bring in settings ui

* SimpleChat:UI:Settings make boolean button text show meaning

* SimpleChat: Update a bit wrt readme and notes in du

* SimpleChat: GarbageTrim enable/disable, show trimmed part ifany

* SimpleChat: highlight trim, garbage trimming bitmore aggressive

Make it easy for end user to identified the trimmed text.

Make garbage trimming logic, consider a longer repeat garbage
substring.

* SimpleChat: Cleanup a bit wrt Api end point related flow

Consolidate many of the Api end point related basic meta data into
ApiEP class.

Remove the hardcoded ApiEP/Mode settings from html+js, instead use
the generic select helper logic, inturn in the settings block.

Move helper to generate the appropriate request json string based
on ApiEP into SimpleChat class itself.

* SimpleChat:Move extracting assistant response to SimpleChat class

so also the trimming of garbage.

* SimpleChat:DU: Bring in both trim garbage logics to try trim

* SimpleChat: Cleanup readme a bit, add one more chathistory length

* SimpleChat:Stream:Initial handshake skeleton

Parse the got stream responses and try extract the data from it.

It allows for a part read to get a single data line or multiple
data line. Inturn extract the json body and inturn the delta
content/message in it.

* SimpleChat: Move handling oneshot mode server response

Move handling of the oneshot mode server response into SimpleChat.

Also add plumbing for moving multipart server response into same.

* SimpleChat: Move multi part server response handling in

* SimpleChat: Add MultiPart Response handling, common trimming

Add logic to call into multipart/stream server response handling.

Move trimming of garbage at the end into the common handle_response
helper.

Add new global flag to control between oneshot and multipart/stream
mode of fetching response. Allow same to be controlled by user.

If in multipart/stream mode, send the stream flag to the server.

* SimpleChat: show streamed generative text as it becomes available

Now that the extracting of streamed generated text is implemented,
add logic to show the same on the screen.

* SimpleChat:DU: Add NewLines helper class

To work with an array of new lines. Allow adding, appending,
shifting, ...

* SimpleChat:DU: Make NewLines shift more robust and flexible

* SimpleChat:HandleResponseMultiPart using NewLines helper

Make handle_response_multipart logic better and cleaner. Now it
allows for working with the situation, where the delta data line
got from server in stream mode, could be split up when recving,
but still the logic will handle it appropriately.

ALERT: Rather except (for now) for last data line wrt a request's
response.

* SimpleChat: Disable console debug by default by making it dummy

Parallely save a reference to the original func.

* SimpleChat:MultiPart/Stream flow cleanup

Dont try utf8-decode and newlines-add_append if no data to work on.

If there is no more data to get (ie done is set), then let NewLines
instance return line without newline at end, So that we dont miss
out on any last-data-line without newline kind of scenario.

Pass stream flag wrt utf-8 decode, so that if any multi-byte char
is only partly present in the passed buffer, it can be accounted
for along with subsequent buffer. At sametime, bcas of utf-8's
characteristics there shouldnt be any unaccounted bytes at end,
for valid block of utf8 data split across chunks, so not bothering
calling with stream set to false at end. LATER: Look at TextDecoder's
implementation, for any over intelligence, it may be doing..
If needed, one can use done flag to account wrt both cases.

* SimpleChat: Move baseUrl to Me and inturn gMe

This should allow easy updating of the base url at runtime by the
end user.

* SimpleChat:UI: Add input element helper

* SimpleChat: Add support for changing the base url

This ensures that if the user is running the server with a
different port or wants to try connect to server on a different
machine, then this can be used.

* SimpleChat: Move request headers into Me and gMe

Inturn allow Authorization to be sent, if not empty.

* SimpleChat: Rather need to use append to insert headers

* SimpleChat: Allow Authorization header to be set by end user

* SimpleChat:UI+: Return div and element wrt creatediv helpers

use it to set placeholder wrt Authorization header.

Also fix copy-paste oversight.

* SimpleChat: readme wrt authorization, maybe minimal openai testing

* SimpleChat: model request field for openai/equivalent compat

May help testing with openai/equivalent web services, if they
require this field.

* SimpleChat: readme stream-utf-8 trim-english deps, exception2error

* Readme: Add a entry for simplechat in the http server section

* SimpleChat:WIP:Collate internally, Stream mode Trap exceptions

This can help ensure that data fetched till that point, can be
made use of, rather than losing it.

On some platforms, the time taken wrt generating a long response,
may lead to the network connection being broken when it enters
some user-no-interaction related power saving mode.

* SimpleChat:theResp-origMsg: Undo a prev change to fix non trim

When the response handling was moved into SimpleChat, I had changed
a flow bit unnecessarily and carelessly, which resulted in the non
trim flow, missing out on retaining the ai assistant response.

This has been fixed now.

* SimpleChat: Save message internally in handle_response itself

This ensures that throwing the caught exception again for higher
up logic, doesnt lose the response collated till that time.

Go through theResp.assistant in catch block, just to keep simple
consistency wrt backtracing just in case.

Update the readme file.

* SimpleChat:Cleanup: Add spacing wrt shown req-options

* SimpleChat:UI: CreateDiv Divs map to GridX2 class

This allows the settings ui to be cleaner structured.

* SimpleChat: Show Non SettingsUI config field by default

* SimpleChat: Allow for multiline system prompt

Convert SystemPrompt into a textarea with 2 rows. Reduce
user-input-textarea to 2 rows from 3, so that overall
vertical space usage remains same.

Shorten usage messages a bit, cleanup to sync with settings ui.

* SimpleChat: Add basic skeleton for saving and loading chat

Inturn when ever a chat message (system/user/model) is added,
the chat will be saved into browser's localStorage.

* SimpleChat:ODS: Add a prefix to chatid wrt ondiskstorage key

* SimpleChat:ODS:WIP:TMP: Add UI to load previously saved chat

This is a temporary flow

* SimpleChat:ODS:Move restore/load saved chat btn setup to Me

This also allows being able to set the common system prompt
ui element to loaded chat's system prompt.

* SimpleChat:Readme updated wrt save and restore chat session info

* SimpleChat:Show chat session restore button, only if saved session

* SimpleChat: AutoCreate ChatRequestOptions settings to an extent

* SimpleChat: Update main README wrt usage with server

examples/server/public_simplechat/readme.md

@@ -11,18 +11,29 @@ in a simple way with minimal code from a common code base. Inturn additionally i
 multiple independent back and forth chatting to an extent, with the ai llm model at a basic level, with their
 own system prompts.
 
+This allows seeing the generated text / ai-model response in oneshot at the end, after it is fully generated,
+or potentially as it is being generated, in a streamed manner from the server/ai-model.
+
+Auto saves the chat session locally as and when the chat is progressing and inturn at a later time when you
+open SimpleChat, option is provided to restore the old chat session, if a matching one exists.
+
 The UI follows a responsive web design so that the layout can adapt to available display space in a usable
 enough manner, in general.
 
 Allows developer/end-user to control some of the behaviour by updating gMe members from browser's devel-tool
-console.
+console. Parallely some of the directly useful to end-user settings can also be changed using the provided
+settings ui.
 
-NOTE: Given that the idea is for basic minimal testing, it doesnt bother with any model context length and
-culling of old messages from the chat by default. However by enabling the sliding window chat logic, a crude
-form of old messages culling can be achieved.
+NOTE: Current web service api doesnt expose the model context length directly, so client logic doesnt provide
+any adaptive culling of old messages nor of replacing them with summary of their content etal. However there
+is a optional sliding window based chat logic, which provides a simple minded culling of old messages from
+the chat history before sending to the ai model.
 
-NOTE: It doesnt set any parameters other than temperature and max_tokens for now. However if someone wants
-they can update the js file or equivalent member in gMe as needed.
+NOTE: Wrt options sent with the request, it mainly sets temperature, max_tokens and optionaly stream for now.
+However if someone wants they can update the js file or equivalent member in gMe as needed.
+
+NOTE: One may be able to use this to chat with openai api web-service /chat/completions endpoint, in a very
+limited / minimal way. One will need to set model, openai url and authorization bearer key in settings ui.
 
 
 ## usage
@@ -52,9 +63,15 @@ Open this simple web front end from your local browser
 
 Once inside
 
-* Select between chat and completion mode. By default it is set to chat mode.
+* If you want to, you can change many of the default global settings
+  * the base url (ie ip addr / domain name, port)
+  * chat (default) vs completion mode
+  * try trim garbage in response or not
+  * amount of chat history in the context sent to server/ai-model
+  * oneshot or streamed mode.
 
 * In completion mode
+  * one normally doesnt use a system prompt in completion mode.
   * logic by default doesnt insert any role specific "ROLE: " prefix wrt each role's message.
     If the model requires any prefix wrt user role messages, then the end user has to
     explicitly add the needed prefix, when they enter their chat message.
@@ -88,12 +105,16 @@ Once inside
 * Wait for the logic to communicate with the server and get the response.
   * the user is not allowed to enter any fresh query during this time.
   * the user input box will be disabled and a working message will be shown in it.
+  * if trim garbage is enabled, the logic will try to trim repeating text kind of garbage to some extent.
 
 * just refresh the page, to reset wrt the chat history and or system prompt and start afresh.
 
 * Using NewChat one can start independent chat sessions.
   * two independent chat sessions are setup by default.
 
+* When you want to print, switching ChatHistoryInCtxt to Full and clicking on the chat session button of
+  interest, will display the full chat history till then wrt same, if you want full history for printing.
+
 
 ## Devel note
 
@@ -104,14 +125,31 @@ by developers who may not be from web frontend background (so inturn may not be
 end-use-specific-language-extensions driven flows) so that they can use it to explore/experiment things.
 
 And given that the idea is also to help explore/experiment for developers, some flexibility is provided
-to change behaviour easily using the devel-tools/console, for now. And skeletal logic has been implemented
-to explore some of the end points and ideas/implications around them.
+to change behaviour easily using the devel-tools/console or provided minimal settings ui (wrt few aspects).
+Skeletal logic has been implemented to explore some of the end points and ideas/implications around them.
 
 
 ### General
 
 Me/gMe consolidates the settings which control the behaviour into one object.
 One can see the current settings, as well as change/update them using browsers devel-tool/console.
+It is attached to the document object. Some of these can also be updated using the Settings UI.
+
+  baseURL - the domain-name/ip-address and inturn the port to send the request.
+
+  bStream - control between oneshot-at-end and live-stream-as-its-generated collating and showing
+  of the generated response.
+
+    the logic assumes that the text sent from the server follows utf-8 encoding.
+
+    in streaming mode - if there is any exception, the logic traps the same and tries to ensure
+    that text generated till then is not lost.
+
+      if a very long text is being generated, which leads to no user interaction for sometime and
+      inturn the machine goes into power saving mode or so, the platform may stop network connection,
+      leading to exception.
+
+  apiEP - select between /completions and /chat/completions endpoint provided by the server/ai-model.
 
   bCompletionFreshChatAlways - whether Completion mode collates complete/sliding-window history when
   communicating with the server or only sends the latest user query/message.
@@ -119,6 +157,19 @@ One can see the current settings, as well as change/update them using browsers d
   bCompletionInsertStandardRolePrefix - whether Completion mode inserts role related prefix wrt the
   messages that get inserted into prompt field wrt /Completion endpoint.
 
+  bTrimGarbage - whether garbage repeatation at the end of the generated ai response, should be
+  trimmed or left as is. If enabled, it will be trimmed so that it wont be sent back as part of
+  subsequent chat history. At the same time the actual trimmed text is shown to the user, once
+  when it was generated, so user can check if any useful info/data was there in the response.
+
+    One may be able to request the ai-model to continue (wrt the last response) (if chat-history
+    is enabled as part of the chat-history-in-context setting), and chances are the ai-model will
+    continue starting from the trimmed part, thus allows long response to be recovered/continued
+    indirectly, in many cases.
+
+    The histogram/freq based trimming logic is currently tuned for english language wrt its
+    is-it-a-alpabetic|numeral-char regex match logic.
+
   chatRequestOptions - maintains the list of options/fields to send along with chat request,
   irrespective of whether /chat/completions or /completions endpoint.
 
@@ -126,6 +177,14 @@ One can see the current settings, as well as change/update them using browsers d
     modify the existing options value or remove them, for now you can update this global var
     using browser's development-tools/console.
 
+    For string and numeric fields in chatRequestOptions, including even those added by a user
+    at runtime by directly modifying gMe.chatRequestOptions, setting ui entries will be auto
+    created.
+
+  headers - maintains the list of http headers sent when request is made to the server. By default
+  Content-Type is set to application/json. Additionally Authorization entry is provided, which can
+  be set if needed using the settings ui.
+
   iRecentUserMsgCnt - a simple minded SlidingWindow to limit context window load at Ai Model end.
   This is disabled by default. However if enabled, then in addition to latest system message, only
   the last/latest iRecentUserMsgCnt user messages after the latest system prompt and its responses
@@ -140,7 +199,8 @@ One can see the current settings, as well as change/update them using browsers d
 
 By using gMe's iRecentUserMsgCnt and chatRequestOptions.max_tokens one can try to control the
 implications of loading of the ai-model's context window by chat history, wrt chat response to
-some extent in a simple crude way.
+some extent in a simple crude way. You may also want to control the context size enabled when
+the server loads ai-model, on the server end.
 
 
 Sometimes the browser may be stuborn with caching of the file, so your updates to html/css/js
@@ -149,28 +209,15 @@ matter clearing site data, dont directly override site caching in all cases. Wor
 have to change port. Or in dev tools of browser, you may be able to disable caching fully.
 
 
-Concept of multiple chat sessions with different servers, as well as saving and restoring of
-those across browser usage sessions, can be woven around the SimpleChat/MultiChatUI class and
-its instances relatively easily, however given the current goal of keeping this simple, it has
-not been added, for now.
+Currently the server to communicate with is maintained globally and not as part of a specific
+chat session. So if one changes the server ip/url in setting, then all chat sessions will auto
+switch to this new server, when you try using those sessions.
 
 
 By switching between chat.add_system_begin/anytime, one can control whether one can change
 the system prompt, anytime during the conversation or only at the beginning.
 
 
-read_json_early, is to experiment with reading json response data early on, if available,
-so that user can be shown generated data, as and when it is being generated, rather than
-at the end when full data is available.
-
-  the server flow doesnt seem to be sending back data early, atleast for request (inc options)
-  that is currently sent.
-
-  if able to read json data early on in future, as and when ai model is generating data, then
-  this helper needs to indirectly update the chat div with the recieved data, without waiting
-  for the overall data to be available.
-
-
 ### Default setup
 
 By default things are setup to try and make the user experience a bit better, if possible.
@@ -179,7 +226,8 @@ However a developer when testing the server of ai-model may want to change these
 Using iRecentUserMsgCnt reduce chat history context sent to the server/ai-model to be
 just the system-prompt, prev-user-request-and-ai-response and cur-user-request, instead of
 full chat history. This way if there is any response with garbage/repeatation, it doesnt
-mess with things beyond the next question/request/query, in some ways.
+mess with things beyond the next question/request/query, in some ways. The trim garbage
+option also tries to help avoid issues with garbage in the context to an extent.
 
 Set max_tokens to 1024, so that a relatively large previous reponse doesnt eat up the space
 available wrt next query-response. However dont forget that the server when started should
@@ -189,11 +237,33 @@ also be started with a model context size of 1k or more, to be on safe side.
   internal n_predict, for now add the same here on the client side, maybe later add max_tokens
   to /completions endpoint handling code on server side.
 
-Frequency and presence penalty fields are set to 1.2 in the set of fields sent to server
-along with the user query. So that the model is partly set to try avoid repeating text in
-its response.
+NOTE: One may want to experiment with frequency/presence penalty fields in chatRequestOptions
+wrt the set of fields sent to server along with the user query. To check how the model behaves
+wrt repeatations in general in the generated text response.
 
-A end-user can change these behaviour by editing gMe from browser's devel-tool/console.
+A end-user can change these behaviour by editing gMe from browser's devel-tool/console or by
+using the providing settings ui.
+
+
+### OpenAi / Equivalent API WebService
+
+One may be abe to handshake with OpenAI/Equivalent api web service's /chat/completions endpoint
+for a minimal chatting experimentation by setting the below.
+
+* the baseUrl in settings ui
+  * https://api.openai.com/v1 or similar
+
+* Wrt request body - gMe.chatRequestOptions
+  * model (settings ui)
+  * any additional fields if required in future
+
+* Wrt request headers - gMe.headers
+  * Authorization (available through settings ui)
+    * Bearer THE_OPENAI_API_KEY
+  * any additional optional header entries like "OpenAI-Organization", "OpenAI-Project" or so
+
+NOTE: Not tested, as there is no free tier api testing available. However logically this might
+work.
 
 
 ## At the end