"""UI main entry point."""

import logging
import os
from pathlib import Path

from fastapi import FastAPI, Request
from fastapi.responses import HTMLResponse, JSONResponse
from fastapi.staticfiles import StaticFiles
from fastapi.templating import Jinja2Templates

from apps.ui.api_client import fetch_devices, fetch_layout

logger = logging.getLogger(__name__)

# Read configuration from environment variables
API_BASE = os.getenv("API_BASE", "http://localhost:8001")
BASE_PATH = os.getenv("BASE_PATH", "")  # e.g., "/ui" for reverse proxy

print(f"UI using API_BASE: {API_BASE}")
print(f"UI using BASE_PATH: {BASE_PATH}")

def api_url(path: str) -> str:
    """Helper function to construct API URLs.
    
    Args:
        path: API path (e.g., "/devices")
        
    Returns:
        Full API URL
    """
    return f"{API_BASE}{path}"

# Initialize FastAPI app with optional root_path for reverse proxy
app = FastAPI(
    title="Home Automation UI",
    description="User interface for home automation system",
    version="0.1.0",
    root_path=BASE_PATH
)

# Setup Jinja2 templates
templates_dir = Path(__file__).parent / "templates"
templates = Jinja2Templates(directory=str(templates_dir))

# Setup static files
static_dir = Path(__file__).parent / "static"
static_dir.mkdir(exist_ok=True)
app.mount("/static", StaticFiles(directory=str(static_dir)), name="static")


@app.get("/health")
async def health() -> JSONResponse:
    """Health check endpoint for Kubernetes/Docker.
    
    Returns:
        JSONResponse: Health status
    """
    return JSONResponse({
        "status": "ok",
        "service": "ui",
        "api_base": API_BASE,
        "base_path": BASE_PATH
    })


@app.get("/", response_class=HTMLResponse)
async def index(request: Request) -> HTMLResponse:
    """Redirect to dashboard.
    
    Args:
        request: The FastAPI request object
        
    Returns:
        HTMLResponse: Rendered dashboard
    """
    return await rooms(request)


@app.get("/rooms", response_class=HTMLResponse)
async def rooms(request: Request) -> HTMLResponse:
    """Render the rooms overview page.
    
    Args:
        request: The FastAPI request object
        
    Returns:
        HTMLResponse: Rendered rooms template
    """
    return templates.TemplateResponse("rooms.html", {
        "request": request,
        "api_base": API_BASE
    })


@app.get("/room/{room_name}", response_class=HTMLResponse)
async def room_detail(request: Request, room_name: str) -> HTMLResponse:
    """Render the room detail page with devices.
    
    Args:
        request: The FastAPI request object
        room_name: Name of the room to display
        
    Returns:
        HTMLResponse: Rendered room template
    """
    return templates.TemplateResponse("room.html", {
        "request": request,
        "api_base": API_BASE,
        "room_name": room_name
    })


@app.get("/device/{device_id}", response_class=HTMLResponse)
async def device_detail(request: Request, device_id: str) -> HTMLResponse:
    """Render the device detail page with controls.
    
    Args:
        request: The FastAPI request object
        device_id: ID of the device to display
        
    Returns:
        HTMLResponse: Rendered device template
    """
    return templates.TemplateResponse("device.html", {
        "request": request,
        "api_base": API_BASE,
        "device_id": device_id
    })


@app.get("/garage", response_class=HTMLResponse)
async def garage(request: Request) -> HTMLResponse:
    """Render the garage page with car outlet devices.
    
    Args:
        request: The FastAPI request object
        
    Returns:
        HTMLResponse: Rendered garage template
    """
    return templates.TemplateResponse("garage.html", {
        "request": request,
        "api_base": API_BASE
    })


@app.get("/dashboard", response_class=HTMLResponse)
async def dashboard(request: Request) -> HTMLResponse:
    """Render the dashboard with rooms and devices.
    
    Args:
        request: The FastAPI request object
        
    Returns:
        HTMLResponse: Rendered dashboard template
    """
    try:
        # Load layout from API (use configured API_BASE)
        layout_data = fetch_layout(API_BASE)
        
        # Fetch devices from API (now includes features)
        api_devices = fetch_devices(API_BASE)
        
        # Create device lookup by device_id
        device_map = {d["device_id"]: d for d in api_devices}
        
        # Build rooms with merged device data
        rooms = []
        for room in layout_data.get("rooms", []):
            devices = []
            for tile in room.get("devices", []):
                # Merge tile data with API device data
                device_data = {
                    "device_id": tile["device_id"],
                    "title": tile["title"],
                    "icon": tile["icon"],
                    "rank": tile["rank"],
                }
                
                # Add type, name, and features from API if available
                if tile["device_id"] in device_map:
                    api_device = device_map[tile["device_id"]]
                    device_data["type"] = api_device.get("type")
                    device_data["name"] = api_device.get("name")
                    device_data["features"] = api_device.get("features", {})
                else:
                    device_data["features"] = {}
                
                devices.append(device_data)
            
            # Sort devices by rank (ascending)
            devices.sort(key=lambda d: d["rank"])
            
            rooms.append({
                "name": room["name"],
                "devices": devices
            })
        
        logger.info(f"Rendering dashboard with {len(rooms)} rooms")
        
        return templates.TemplateResponse("dashboard.html", {
            "request": request,
            "rooms": rooms,
            "api_base": API_BASE  # Pass API_BASE to template
        })
        
    except Exception as e:
        logger.error(f"Error rendering dashboard: {e}", exc_info=True)
        # Fallback to empty dashboard
        return templates.TemplateResponse("dashboard.html", {
            "request": request,
            "rooms": [],
            "api_base": API_BASE  # Pass API_BASE even on error
        })


def main() -> None:
    """Run the UI application with uvicorn."""
    import uvicorn
    
    uvicorn.run(
        "apps.ui.main:app",
        host="0.0.0.0",
        port=8002,
        reload=True
    )


if __name__ == "__main__":
    main()