app.py

from fastapi import FastAPI, HTTPException, Depends, Request
from fastapi.responses import HTMLResponse
from fastapi.templating import Jinja2Templates
from sqlalchemy.orm import Session
from sqlalchemy import create_engine, Column, Integer, Float, String, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
from datetime import datetime, timedelta
import random
import folium
from folium.plugins import MarkerCluster

# Sử dụng thư mục /tmp để lưu trữ cơ sở dữ liệu SQLite
DATABASE_URL = "sqlite:///:memory:"
# DATABASE_URL = "sqlite:///tmp/database.db"

engine = create_engine(DATABASE_URL, connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base = declarative_base()

class WifiSignal(Base):
    __tablename__ = "wifi_signal"
    id = Column(Integer, primary_key=True, index=True)
    latitude = Column(Float, index=True)
    longitude = Column(Float, index=True)
    timestamp = Column(DateTime, index=True)
    signal_strength = Column(Integer)

Base.metadata.create_all(bind=engine)

app = FastAPI()
templates = Jinja2Templates(directory="templates")

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

@app.post("/api/generate-data")
def generate_data(db: Session = Depends(get_db)):
    base_latitude = 35.6837
    base_longitude = 139.6805
    start_date = datetime(2024, 8, 1)
    end_date = datetime(2024, 8, 7)
    delta = end_date - start_date

    for _ in range(100):
        random_days = random.randint(0, delta.days)
        random_seconds = random.randint(0, 86400)
        random_time = start_date + timedelta(days=random_days, seconds=random_seconds)

        random_latitude = base_latitude + random.uniform(-0.01, 0.01)
        random_longitude = base_longitude + random.uniform(-0.01, 0.01)
        random_signal_strength = random.randint(10, 50)

        wifi_signal = WifiSignal(
            latitude=random_latitude,
            longitude=random_longitude,
            timestamp=random_time,
            signal_strength=random_signal_strength
        )

        db.add(wifi_signal)

    db.commit()
    return {"message": "Demo data generated successfully"}

@app.delete("/api/delete-data")
def delete_data(db: Session = Depends(get_db)):
    try:
        num_rows_deleted = db.query(WifiSignal).delete()
        db.commit()
        return {"message": f"Deleted {num_rows_deleted} rows from the database."}
    except Exception as e:
        db.rollback()
        raise HTTPException(status_code=500, detail=f"An error occurred: {str(e)}")

@app.post("/api/upload")
def upload_data(request: Request, db: Session = Depends(get_db)):
    data = request.json()
    latitude = data.get('latitude')
    longitude = data.get('longitude')
    timestamp = datetime.strptime(data.get('timestamp'), '%Y-%m-%d %H:%M:%S')
    signal_strength = data.get('signal_strength')
    
    wifi_signal = WifiSignal(latitude=latitude, longitude=longitude, timestamp=timestamp, signal_strength=signal_strength)
    db.add(wifi_signal)
    db.commit()
    
    return {"message": "Data uploaded successfully"}

@app.get("/", response_class=HTMLResponse)
def show_map(request: Request, start_date: str = None, end_date: str = None, db: Session = Depends(get_db)):
    query = db.query(WifiSignal)

    if start_date and end_date:
        start_datetime = datetime.strptime(start_date, '%Y-%m-%d')
        end_datetime = datetime.strptime(end_date, '%Y-%m-%d')
        query = query.filter(WifiSignal.timestamp >= start_datetime, WifiSignal.timestamp <= end_datetime)

    signals = query.all()
    signal_data = [(signal.latitude, signal.longitude, signal.signal_strength) for signal in signals]

    if signal_data:
        min_signal = min(s[2] for s in signal_data)
        max_signal = max(s[2] for s in signal_data)
    else:
        min_signal = max_signal = 1

    m = folium.Map(location=[35.6837, 139.6805], zoom_start=12)
    marker_cluster = MarkerCluster().add_to(m)

    for lat, lon, signal_strength in signal_data:
        if max_signal - min_signal != 0:
            radius = 5 + 10 * ((signal_strength - min_signal) / (max_signal - min_signal))
        else:
            radius = 15
        folium.CircleMarker(
            location=[lat, lon],
            radius=radius,
            popup=f'Signal Strength: {signal_strength}',
            color='blue',
            fill=True,
            fill_opacity=0.6
        ).add_to(marker_cluster)
    
    map_html = m._repr_html_()
    return templates.TemplateResponse("map.html", {"request": request, "map_html": map_html, "start_date": start_date, "end_date": end_date})