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from __future__ import annotations

from dataclasses import dataclass

import os

from dotenv import load_dotenv

from fastapi import FastAPI, HTTPException, Request

from fastapi.middleware.cors import CORSMiddleware

from fastapi.staticfiles import StaticFiles

from fastapi.templating import Jinja2Templates

from pydantic import BaseModel, Field

from agents.language_agent import explain_concept

from agents.research_agent import SUPPORTED_LANGUAGES, normalize_language_key, research_topic

load_dotenv()

app = FastAPI(title="Clextron", version="0.1.0")

app.mount("/static", StaticFiles(directory="static"), name="static")

templates = Jinja2Templates(directory="templates")

app.add_middleware(

CORSMiddleware,

allow_origins=["*"],

allow_credentials=True,

allow_methods=["*"],

allow_headers=["*"],

)

class ResearchRequest(BaseModel):

topic: str = Field(..., min_length=1, description="Topic to research")

language: str = Field(default="english", description="Language for response")

class ResearchResponse(BaseModel):

topic: str

language: str

result: str

class ExplainRequest(BaseModel):

concept: str = Field(..., min_length=1, description="Concept to explain")

language: str = Field(default="english", description="Language for explanation")

class ExplainResponse(BaseModel):

concept: str

language: str

result: str

class LanguageOption(BaseModel):

key: str

name: str

@dataclass(frozen=True)

class AppStatus:

status: str = "ok"

service: str = "Clextron"

def _handle_agent_error(exc: Exception) -> HTTPException:

message = str(exc)

lowered = message.lower()

if "429" in message or "quota" in lowered or "rate limit" in lowered:

return HTTPException(

status_code=429,

detail="API quota reached for today. Try again later or use a different Gemini project key.",

)

return HTTPException(status_code=500, detail=message)

@app.get("/")

def root(request: Request):

language_options = [

{"key": key, "name": SUPPORTED_LANGUAGES[key]}

for key in sorted(SUPPORTED_LANGUAGES.keys())

]

return templates.TemplateResponse(

request,

"index.html",

{

"language_options": language_options,

"default_language": "english",

},

)

@app.get("/health", response_model=AppStatus)

def health() -> AppStatus:

return AppStatus()

@app.get("/languages", response_model=list[LanguageOption])

def languages() -> list[LanguageOption]:

return [

LanguageOption(key=key, name=SUPPORTED_LANGUAGES[key])

for key in sorted(SUPPORTED_LANGUAGES.keys())

]

@app.post("/research", response_model=ResearchResponse)

def research(request: ResearchRequest) -> ResearchResponse:

language_key = normalize_language_key(request.language)

try:

result = research_topic(request.topic, language_key)

except ValueError as exc:

raise HTTPException(status_code=400, detail=str(exc)) from exc

except Exception as exc: # pragma: no cover

raise _handle_agent_error(exc) from exc

return ResearchResponse(topic=request.topic, language=language_key, result=result)

@app.post("/explain", response_model=ExplainResponse)

def explain(request: ExplainRequest) -> ExplainResponse:

language_key = normalize_language_key(request.language)

try:

result = explain_concept(request.concept, language_key)

except ValueError as exc:

raise HTTPException(status_code=400, detail=str(exc)) from exc

except Exception as exc: # pragma: no cover

raise _handle_agent_error(exc) from exc

return ExplainResponse(concept=request.concept, language=language_key, result=result)