app.py

# main.py
from fastapi import FastAPI, HTTPException, BackgroundTasks
from fastapi.middleware.cors import CORSMiddleware
from pydantic import BaseModel
from typing import Dict, Optional
import uuid
from datetime import datetime, timedelta
import asyncio
import random

app = FastAPI(title="Kairos News API", version="1.0")

# Enable CORS
app.add_middleware(
    CORSMiddleware,
    allow_origins=["*"],
    allow_methods=["*"],
    allow_headers=["*"],
)

# In-memory database simulation
jobs_db: Dict[str, Dict] = {}

class PostRequest(BaseModel):
    query: str
    topic: str
    date: str  # Format: "YYYY/MM to YYYY/MM"

class JobStatus(BaseModel):
    id: str
    status: str  # "processing", "completed", "failed"
    created_at: datetime
    completed_at: Optional[datetime]
    request: PostRequest
    result: Optional[Dict]

@app.post("/index", response_model=JobStatus)
async def create_job(request: PostRequest, background_tasks: BackgroundTasks):
    """Create a new processing job"""
    job_id = str(uuid.uuid4())
    
    # Store initial job data
    jobs_db[job_id] = {
        "status": "processing",
        "created_at": datetime.now(),
        "completed_at": None,
        "request": request.dict(),
        "result": None
    }
    
    # Simulate background processing
    background_tasks.add_task(process_job, job_id)
    
    return {
        "id": job_id,
        "status": "processing",
        "created_at": jobs_db[job_id]["created_at"],
        "completed_at": None,
        "request": request,
        "result": None
    }

@app.get("/loading", response_model=JobStatus)
async def get_job_status(id: str):
    """Check job status with timeout simulation"""
    if id not in jobs_db:
        raise HTTPException(status_code=404, detail="Job not found")
    
    job = jobs_db[id]
    
    # Simulate random processing time (3-25 seconds)
    elapsed = datetime.now() - job["created_at"]
    if elapsed < timedelta(seconds=3):
        await asyncio.sleep(1)  # Artificial delay
        
    # 10% chance of failure for demonstration
    if random.random() < 0.1 and job["status"] == "processing":
        job["status"] = "failed"
        job["result"] = {"error": "Random processing failure"}
    
    return {
        "id": id,
        "status": job["status"],
        "created_at": job["created_at"],
        "completed_at": job["completed_at"],
        "request": job["request"],
        "result": job["result"]
    }

async def process_job(job_id: str):
    """Background task to simulate processing"""
    await asyncio.sleep(random.uniform(3, 10))  # Random processing time
    
    if job_id in jobs_db:
        jobs_db[job_id]["status"] = "completed"
        jobs_db[job_id]["completed_at"] = datetime.now()
        jobs_db[job_id]["result"] = {
            "query": jobs_db[job_id]["request"]["query"],
            "topic": jobs_db[job_id]["request"]["topic"],
            "date_range": jobs_db[job_id]["request"]["date"],
            "analysis": f"Processed results for {jobs_db[job_id]['request']['query']}",
            "sources": ["Source A", "Source B", "Source C"],
            "summary": "This is a generated summary based on your query."
        }

@app.get("/jobs")
async def list_jobs():
    """Debug endpoint to view all jobs"""
    return jobs_db