[Bug]: Chatbot not work - #281
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- Load .env via python-dotenv so 'cp .env.example .env' works (was exiting at startup) - Default to a current Gemini model (gemini-2.5-flash); document GEMINI_MODEL - Centralize the backend URL (chatbotConfig.js/chatbotApi.js) and use it from home.js and review.js — fixes hardcoded 127.0.0.1 URLs and the relative /chat 404 - Add a Vite dev proxy and nginx proxy for /chat and /explain_mistake - Add the Flask chatbot service to Docker (Dockerfile.chatbot + docker-compose) - Harden templates/index.html: response.ok handling, textContent, no onkeypress - Bind Flask to 0.0.0.0 so containers / remote hosts can reach it Closes omroy07#266
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google-generativeai depends on grpcio, whose native DLL is blocked by Windows Application Control (WDAC) policies on some systems (verified: 'DLL load failed ... Application Control policy has blocked this file'). google-genai talks to Gemini over HTTPS (httpx) with no gRPC dependency, so the AI Tutor runs on those machines too. It is also the SDK Google recommends going forward and supports current models like gemini-3.5-flash.
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Summary
Fixes the AI Tutor chatbot not working (#266). Root causes were verified across the frontend, backend, and container setup:
.envwas never loaded —chatbot.pyreadGEMINI_API_KEYfrom the environment without callingload_dotenv(), so the documentedcp .env.example .envworkflow crashed at startup.gemini-1.5-pro, which Google discontinued in 2025. Every request 404'd, hidden by the genericexcept.home.jshardcodedhttp://127.0.0.1:5000(broke over HTTPS/Docker) andreview.jsused a relativefetch(\"/chat\")that only existed on the Flask-served page (404 on the static host).docker-compose.yml/Dockerfile shipped nginx static files only; no Flask service, no proxy for/chat.undefined—templates/index.htmlhad noresponse.okhandling and usedonkeypress/uncheckedinnerHTML.Changes
chatbot.pyload_dotenv(); default modelgemini-2.5-flash; bind0.0.0.0.env.exampleGEMINI_MODEL; update API-key URLchatbotConfig.js(new)chatbotApi.js(new)window.chatbotPosthelper used byhome.js+review.jshome.js,review.jshome.html,review.html,review_mistakes.htmlvite.config.js/chatand/explain_mistakenginx.conf(new),DockerfileDockerfile.chatbot(new),docker-compose.ymltemplates/index.htmlresponse.okhandling, safe rendering, keydown listenerVerification
node --checkpasses on all modified/new JS filespython -m py_compile chatbot.pypassespython chatbot.py+ open the site; optionalnpm run devproxy path addedCloses #266