from fastapi import FastAPI, HTTPException, Request, Form, Depends, status, APIRouter, Header
from fastapi.responses import HTMLResponse, RedirectResponse, JSONResponse, StreamingResponse
from fastapi.templating import Jinja2Templates
from fastapi.staticfiles import StaticFiles
from fastapi.security import HTTPBasic
from datetime import datetime, timedelta
import random
import folium
import uuid as uuid_module
from folium.plugins import MarkerCluster
from typing import Optional
from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, Session
from models import Base, User, StatusRecord, SystemSetting, Device
import io
import csv
from typing import Dict

# Database setup
SQLALCHEMY_DATABASE_URL = "sqlite:///./database.db"
engine = create_engine(SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False})
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

Base.metadata.create_all(bind=engine)

# Create default admin user and system settings
def create_default_data():
    db = SessionLocal()
    try:
        # Create default admin user if not exists
        if not db.query(User).filter(User.username == "admin").first():
            admin_user = User(
                username="admin",
                email="admin@email.com",
                password="admin",
                is_admin=True,
                is_active=True
            )
            db.add(admin_user)

        # Create default system settings if not exists
        if not db.query(SystemSetting).first():
            default_settings = SystemSetting()
            db.add(default_settings)

        db.commit()
    except Exception as e:
        db.rollback()
        print(f"Error creating default data: {str(e)}")
    finally:
        db.close()

create_default_data()

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

# Create APIRouters for grouping
admin_router = APIRouter(prefix="/admin", tags=["admin"])
api_router = APIRouter(prefix="/api", tags=["api"])

# Dependency to get the database session
def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

def get_current_user(request: Request, db: Session = Depends(get_db)) -> Optional[User]:
    username = request.cookies.get("username")
    if username:
        return db.query(User).filter(User.username == username).first()
    return None

def login_required(request: Request, db: Session = Depends(get_db)):
    username = request.cookies.get("username")
    if not username:
        return RedirectResponse(url="/login", status_code=status.HTTP_302_FOUND)
    user = db.query(User).filter(User.username == username).first()
    if not user:
        return RedirectResponse(url="/login", status_code=status.HTTP_302_FOUND)
    return user

# Device authentication function
def authenticate_device(device_id: str, device_password: str, db: Session = Depends(get_db)):
    device = db.query(Device).filter(Device.device_id == device_id).first()
    if not device or device.password != device_password:
        raise HTTPException(status_code=status.HTTP_401_UNAUTHORIZED, detail="Invalid device credentials")
    return device

@app.get("/login", response_class=HTMLResponse)
async def login_page(request: Request):
    return templates.TemplateResponse("login.html", {"request": request})

@app.post("/login")
async def login(request: Request, username: str = Form(...), password: str = Form(...), db: Session = Depends(get_db)):
    user = db.query(User).filter(User.username == username, User.password == password, User.is_active == True).first()
    if user:
        user.last_login = datetime.now()
        db.commit()
        response = RedirectResponse(url="/", status_code=status.HTTP_302_FOUND)
        response.set_cookie(key="username", value=username, httponly=True)
        return response
    return templates.TemplateResponse("login.html", {"request": request, "error": "Invalid credentials or inactive account"})

@app.get("/logout")
async def logout():
    response = RedirectResponse(url="/login", status_code=status.HTTP_302_FOUND)
    response.delete_cookie("username")
    return response

@app.get("/register", response_class=HTMLResponse)
async def register_page(request: Request):
    return templates.TemplateResponse("register.html", {"request": request})

@app.post("/register")
async def register(username: str = Form(...), email: str = Form(...), password: str = Form(...), db: Session = Depends(get_db)):
    existing_user = db.query(User).filter(User.username == username).first()
    if existing_user:
        return RedirectResponse(url="/register?error=1", status_code=status.HTTP_302_FOUND)
    new_user = User(username=username, email=email, password=password)
    db.add(new_user)
    db.commit()
    return RedirectResponse(url="/login", status_code=status.HTTP_302_FOUND)

# Admin routes
@admin_router.get("", response_class=HTMLResponse)
async def admin_page(request: Request, db: Session = Depends(get_db)):
    current_user = login_required(request, db)
    if isinstance(current_user, RedirectResponse):
        return current_user
    if not current_user.is_admin:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not authorized")
    users = db.query(User).all()
    devices = db.query(Device).all()
    return templates.TemplateResponse("admin.html", {"request": request, "users": users, "devices": devices})

@admin_router.post("/delete/{username}")
async def delete_user(request: Request, username: str, db: Session = Depends(get_db)):
    current_user = login_required(request, db)
    if isinstance(current_user, RedirectResponse):
        return current_user
    if not current_user.is_admin:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not authorized")
    user = db.query(User).filter(User.username == username).first()
    if user:
        db.delete(user)
        db.commit()
    return RedirectResponse(url="/admin", status_code=status.HTTP_302_FOUND)

@admin_router.post("/edit/{username}")
async def edit_user(request: Request, username: str, new_username: str = Form(...), email: str = Form(...), is_admin: bool = Form(False), is_active: bool = Form(False), db: Session = Depends(get_db)):
    current_user = login_required(request, db)
    if isinstance(current_user, RedirectResponse):
        return current_user
    if not current_user.is_admin:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not authorized")
    user = db.query(User).filter(User.username == username).first()
    if user:
        if new_username != username and db.query(User).filter(User.username == new_username).first():
            raise HTTPException(status_code=400, detail="Username already exists")
        user.username = new_username
        user.email = email
        user.is_admin = is_admin
        user.is_active = is_active
        db.commit()
    return RedirectResponse(url="/admin", status_code=status.HTTP_302_FOUND)

@admin_router.post("/add_device")
async def add_device(
    request: Request,
    name: str = Form(...),
    description: str = Form(...),
    device_id: str = Form(...),
    password: str = Form(...),
    db: Session = Depends(get_db)
):
    current_user = login_required(request, db)
    if isinstance(current_user, RedirectResponse):
        return current_user
    if not current_user.is_admin:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not authorized")
    
    existing_device = db.query(Device).filter(Device.device_id == device_id).first()
    if existing_device:
        raise HTTPException(status_code=400, detail="Device ID already exists")
    
    new_device = Device(name=name, description=description, device_id=device_id, password=password)
    db.add(new_device)
    db.commit()
    return RedirectResponse(url="/admin", status_code=status.HTTP_302_FOUND)

@admin_router.post("/edit_device/{device_id}")
async def edit_device(
    request: Request,
    device_id: str,
    name: str = Form(...),
    description: str = Form(...),
    new_device_id: str = Form(...),
    password: str = Form(...),
    db: Session = Depends(get_db)
):
    current_user = login_required(request, db)
    if isinstance(current_user, RedirectResponse):
        return current_user
    if not current_user.is_admin:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not authorized")
    
    device = db.query(Device).filter(Device.device_id == device_id).first()
    if not device:
        raise HTTPException(status_code=404, detail="Device not found")
    
    if new_device_id != device_id and db.query(Device).filter(Device.device_id == new_device_id).first():
        raise HTTPException(status_code=400, detail="New Device ID already exists")
    
    device.name = name
    device.description = description
    device.device_id = new_device_id
    device.password = password
    db.commit()
    return RedirectResponse(url="/admin", status_code=status.HTTP_302_FOUND)

@admin_router.post("/delete_device/{device_id}")
async def delete_device(request: Request, device_id: str, db: Session = Depends(get_db)):
    current_user = login_required(request, db)
    if isinstance(current_user, RedirectResponse):
        return current_user
    if not current_user.is_admin:
        raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail="Not authorized")
    
    device = db.query(Device).filter(Device.device_id == device_id).first()
    if device:
        db.delete(device)
        db.commit()
    return RedirectResponse(url="/admin", status_code=status.HTTP_302_FOUND)

# API routes
@api_router.post("/generate-data")
def generate_data(
    device_id: str = Header(...),
    device_password: str = Header(...),
    db: Session = Depends(get_db)
):
    authenticate_device(device_id, device_password, 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_connect_status = random.choice([0, 1])

        status_record = StatusRecord(
            device_id=device_id,
            latitude=random_latitude,
            longitude=random_longitude,
            timestamp=random_time,
            connect_status=random_connect_status
        )
        db.add(status_record)

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

@api_router.delete("/delete-data", summary="Delete all status records")
def delete_all_data(
    device_id: str = Header(...),
    device_password: str = Header(...),
    db: Session = Depends(get_db)
):
    """
    Delete all status records from the database.
    Requires device authentication.
    """
    authenticate_device(device_id, device_password, db)
    try:
        db.query(StatusRecord).delete()
        db.commit()
        return {"message": "All data deleted successfully"}
    except Exception as e:
        db.rollback()
        raise HTTPException(status_code=500, detail=f"An error occurred: {str(e)}")

@api_router.delete("/delete-data/{device_id}", summary="Delete status records for a specific device")
def delete_device_data(
    device_id: str,
    auth_device_id: str = Header(...),
    device_password: str = Header(...),
    db: Session = Depends(get_db)
):
    """
    Delete status records for a specific device ID.
    Requires device authentication.
    """
    authenticate_device(auth_device_id, device_password, db)
    try:
        deleted_count = db.query(StatusRecord).filter(StatusRecord.device_id == device_id).delete()
        db.commit()
        if deleted_count == 0:
            return {"message": f"No data found for device ID: {device_id}"}
        return {"message": f"Data for device ID {device_id} deleted successfully"}
    except Exception as e:
        db.rollback()
        raise HTTPException(status_code=500, detail=f"An error occurred: {str(e)}")

@api_router.post("/upload")
async def upload_data(
    device_id: str = Header(...),
    device_password: str = Header(...),
    uuid_str: str = Form(...),
    latitude: float = Form(...),
    longitude: float = Form(...),
    timestamp: str = Form(...),
    connect_status: int = Form(...),
    db: Session = Depends(get_db)
):
    """
    Upload a new status record.
    Requires device authentication and a unique UUID.
    """
    authenticate_device(device_id, device_password, db)
    
    # Validate UUID
    try:
        uuid_obj = uuid_module.UUID(uuid_str)
    except ValueError:
        raise HTTPException(status_code=400, detail="Invalid UUID format")

    try:
        timestamp_dt = datetime.strptime(timestamp, '%Y-%m-%d %H:%M:%S')
        status_record = StatusRecord(
            uuid=str(uuid_obj),
            device_id=device_id,
            latitude=latitude,
            longitude=longitude,
            timestamp=timestamp_dt,
            connect_status=connect_status
        )
        db.add(status_record)
        db.commit()
        return {"message": "Data uploaded successfully"}
    except IntegrityError:
        db.rollback()
        raise HTTPException(status_code=400, detail="UUID already exists")
    except ValueError:
        raise HTTPException(status_code=400, detail="Invalid timestamp format. Use 'YYYY-MM-DD HH:MM:SS'")
    except Exception as e:
        db.rollback()
        raise HTTPException(status_code=500, detail=f"An error occurred: {str(e)}")

@api_router.get("/health_check", summary="Check if the API is functioning correctly")
def health_check(
    device_id: str = Header(...),
    device_password: str = Header(...),
    db: Session = Depends(get_db)
):
    """
    Perform a health check on the API.
    Requires device authentication.
    Returns a 200 status code if successful.
    Returns a 401 Unauthorized error if authentication fails.
    """
    try:
        authenticate_device(device_id, device_password, db)
        return JSONResponse(content={"status": "ok"}, status_code=status.HTTP_200_OK)
    except HTTPException as e:
        if e.status_code == status.HTTP_401_UNAUTHORIZED:
            return JSONResponse(content={"status": "error", "detail": "Unauthorized"}, status_code=status.HTTP_401_UNAUTHORIZED)
        raise e

@api_router.get("/config", summary="Get system configuration", response_model=Dict[str, int])
def get_config(
    device_id: str = Header(...),
    device_password: str = Header(...),
    db: Session = Depends(get_db)
):
    """
    Retrieve the system configuration from SystemSetting.
    Requires device authentication.
    """
    authenticate_device(device_id, device_password, db)
    system_setting = db.query(SystemSetting).first()
    if not system_setting:
        raise HTTPException(status_code=404, detail="System settings not found")
    
    return {
        "check_connect_period": system_setting.check_connect_period,
        "data_sync_period": system_setting.data_sync_period,
        "get_config_period": system_setting.get_config_period,
        "point_distance": system_setting.point_distance
    }

@app.get("/", response_class=HTMLResponse)
def show_map(request: Request, start_date: str = None, end_date: str = None, db: Session = Depends(get_db)):
    current_user = login_required(request, db)
    if isinstance(current_user, RedirectResponse):
        return current_user
    
    query = db.query(StatusRecord)
    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(StatusRecord.timestamp.between(start_datetime, end_datetime))
    
    status_data = [(s.latitude, s.longitude, s.connect_status, s.device_id) for s in query.all()]

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

    for lat, lon, connect_status, device_id in status_data:
        color = 'green' if connect_status == 1 else 'red'
        folium.CircleMarker(
            location=[lat, lon],
            radius=10,
            popup=f'{device_id}',
            color=color,
            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,
        "current_user": current_user
    })

@app.get("/download-csv")
async def download_csv(request: Request, db: Session = Depends(get_db)):
    current_user = login_required(request, db)
    if isinstance(current_user, RedirectResponse):
        return current_user
    
    status_records = db.query(StatusRecord).all()
    
    output = io.StringIO()
    writer = csv.writer(output)
    
    writer.writerow(["UUID", "Device ID", "Latitude", "Longitude", "Timestamp", "Connect Status"])
    
    for record in status_records:
        writer.writerow([record.uuid, record.device_id, record.latitude, record.longitude, record.timestamp, record.connect_status])
    
    response = StreamingResponse(iter([output.getvalue()]), media_type="text/csv")
    response.headers["Content-Disposition"] = "attachment; filename=status_records.csv"
    
    return response

@app.exception_handler(HTTPException)
async def http_exception_handler(request: Request, exc: HTTPException):
    if exc.status_code == status.HTTP_401_UNAUTHORIZED:
        return RedirectResponse(url="/login", status_code=status.HTTP_302_FOUND)
    return templates.TemplateResponse("error.html", {"request": request, "detail": exc.detail}, status_code=exc.status_code)

# Include the routers
app.include_router(admin_router)
app.include_router(api_router)

if __name__ == "__main__":
    import uvicorn
    uvicorn.run(app, host="0.0.0.0", port=7860)