"""
Entry point for the Tourism Recommendation System Gradio app.
This file should be named 'app.py' for Hugging Face Spaces deployment.
Modified to use proper browser-based location detection.
"""

import gradio as gr
import json
import warnings
import tempfile
import os
from crew import tourismAgent

warnings.filterwarnings("ignore", category=SyntaxWarning, module="pysbd")

def process_location(location_input):
    """
    Process location input to handle both coordinate and descriptive formats.
    """
    if not location_input or location_input.strip() == "":
        return None
    
    location_input = location_input.strip()
    
    # Check if location is in lat,lng format
    if ',' in location_input:
        parts = location_input.split(',')
        if len(parts) == 2:
            try:
                lat = float(parts[0].strip())
                lng = float(parts[1].strip())
                return {
                    "latitude": lat, 
                    "longitude": lng,
                    "source": "manual"
                }
            except ValueError:
                pass
    
    # Treat as descriptive location
    return {
        "description": location_input,
        "source": "manual"
    }

def parse_browser_location(location_data):
    """
    Parse location data received from browser geolocation API.
    Expected format: "lat,lng,accuracy" or JSON string with coordinates
    """
    if not location_data or location_data.strip() == "" or location_data == "null":
        return None
    
    try:
        # Handle error messages
        if location_data.startswith('ERROR:'):
            print(f"Browser location error: {location_data}")
            return None
            
        # Try to parse as JSON first (in case of more detailed data)
        if location_data.startswith('{'):
            data = json.loads(location_data)
            return {
                "latitude": data.get('latitude'),
                "longitude": data.get('longitude'),
                "accuracy": data.get('accuracy'),
                "source": "browser"
            }
        else:
            # Parse as simple "lat,lng,accuracy" format
            parts = location_data.split(',')
            if len(parts) >= 2:
                lat = float(parts[0].strip())
                lng = float(parts[1].strip())
                accuracy = float(parts[2].strip()) if len(parts) > 2 else None
                return {
                    "latitude": lat,
                    "longitude": lng,
                    "accuracy": accuracy,
                    "source": "browser"
                }
    except (json.JSONDecodeError, ValueError, IndexError) as e:
        print(f"Error parsing browser location: {e}")
        return None
    
    return None

def validate_api_key(api_key):
    """
    Validate if the provided API key has the correct format.
    """
    if not api_key or api_key.strip() == "":
        return False, "API key is required"
    
    # Basic Anthropic API key format validation
    api_key = api_key.strip()
    if not api_key.startswith("sk-ant-"):
        return False, "Invalid API key format. Anthropic API keys should start with 'sk-ant-'"
    
    if len(api_key) < 50:
        return False, "API key appears to be too short"
    
    return True, "API key format is valid"

def get_tourism_recommendations(interests, location_input, browser_location, api_key):
    """
    Get tourism recommendations based on user interests and location.
    """
    try:
        # Validate API key first
        is_valid, validation_message = validate_api_key(api_key)
        if not is_valid:
            return f"❌ API Key Error: {validation_message}\n\nPlease enter a valid Anthropic API key to use this service."
        
        # Validate inputs
        if not interests or interests.strip() == "":
            return "❌ Please provide your interests or preferences for places to visit."
        
        # Process location - prioritize browser location over manual input
        location = None
        location_info = ""
        
        # First try browser location
        if browser_location and browser_location.strip():
            browser_loc = parse_browser_location(browser_location)
            if browser_loc:
                location = browser_loc
                accuracy_info = f" (±{int(browser_loc.get('accuracy', 0))}m)" if browser_loc.get('accuracy') else ""
                location_info = f"📍 Your location: {browser_loc['latitude']:.4f}, {browser_loc['longitude']:.4f}{accuracy_info}"
        
        # Fallback to manual location input if browser location failed
        if not location and location_input:
            manual_loc = process_location(location_input)
            if manual_loc:
                location = manual_loc
                if 'description' in manual_loc:
                    location_info = f"📍 Using location: {manual_loc['description']}"
                else:
                    location_info = f"📍 Using coordinates: {manual_loc['latitude']:.4f}, {manual_loc['longitude']:.4f}"
        
        # If no location provided
        if not location:
            location_info = "📍 No specific location provided - using general recommendations"
        
        # Prepare inputs for the CrewAI
        inputs = {
            "interests": interests.strip(),
            "location": location,
        }
        
        # Initialize tourism agent with the provided API key
        agent = tourismAgent(api_key=api_key.strip())
        
        # Run the tourism agent
        result = agent.crew().kickoff(inputs=inputs)
        
        # Add location info to the result
        result_with_location = f"{location_info}\n\n{result}"
        
        return result_with_location
        
    except Exception as e:
        error_msg = f"An error occurred while getting recommendations: {str(e)}"
        return f"❌ {error_msg}"

# Create the Gradio interface
with gr.Blocks(
    title="🌍 Tourism Recommendation System",
    theme=gr.themes.Soft(),
    css="""
    .gradio-container {
        max-width: 800px !important;
        margin: 0 auto !important;
    }
    .header {
        text-align: center;
        margin-bottom: 30px;
    }
    .location-section {
        background-color: #e8f4f8;
        padding: 15px;
        border-radius: 8px;
        margin: 10px 0;
        border-left: 4px solid #17a2b8;
    }
    .api-key-section {
        background-color: #fff3cd;
        padding: 15px;
        border-radius: 8px;
        margin: 15px 0;
        border-left: 4px solid #ffc107;
    }
    .location-button {
        margin: 10px 0;
    }
    .status-success {
        color: #28a745;
        background-color: #d4edda;
        border: 1px solid #c3e6cb;
        padding: 10px;
        border-radius: 5px;
        margin: 5px 0;
    }
    .status-error {
        color: #721c24;
        background-color: #f8d7da;
        border: 1px solid #f5c6cb;
        padding: 10px;
        border-radius: 5px;
        margin: 5px 0;
    }
    """
) as demo:
    
    # Header
    gr.Markdown(
        """
        # 🌍 Tourism Recommendation System
        
        Get personalized travel recommendations based on your interests and location!
        Simply describe what kind of places you'd like to visit, and optionally provide your location.
        """,
        elem_classes=["header"]
    )
    
    with gr.Row():
        with gr.Column(scale=1):
            # API Key section
            gr.Markdown("## 🔑 API Configuration")
            
            with gr.Group():
                api_key_input = gr.Textbox(
                    label="Anthropic API Key",
                    placeholder="Enter your Anthropic API key (sk-ant-...)",
                    type="password",
                    info="Your API key is required to use Claude. Get one from: https://console.anthropic.com/"
                )
            
            # Input section
            gr.Markdown("## 📝 Your Preferences")
            
            interests_input = gr.Textbox(
                label="What kind of places interest you?",
                placeholder="e.g., historic places, museums, beaches, adventure spots, local cuisine, art galleries...",
                lines=3,
                max_lines=5
            )
            
            # Location options
            gr.Markdown("## 📍 Location Settings")
            
            with gr.Group(elem_classes=["location-section"]):
                gr.Markdown(
                    """
                    **🎯 For Best Recommendations:** Use your browser location for accurate, location-based suggestions.
                    
                    Your browser will ask for permission to access your location. This data stays private and is only used for recommendations.
                    """
                )
                
                # Browser location button and status
                with gr.Row():
                    get_location_btn = gr.Button(
                        "📍 Get My Current Location",
                        variant="secondary",
                        elem_classes=["location-button"]
                    )
                
                # Hidden field to store browser location data
                browser_location = gr.Textbox(
                    label="Browser Location Data",
                    visible=False,
                    interactive=False,
                    value=""
                )
                
                location_status = gr.Markdown(
                    "Click 'Get My Current Location' to detect your position using your device's GPS/location services.",
                    elem_classes=["status-info"]
                )
                
                gr.Markdown("**Alternative:** Manually specify your location below:")
                
                location_input = gr.Textbox(
                    label="Manual Location Entry",
                    placeholder="e.g., 'New York, NY' or '40.7128,-74.0060' (latitude,longitude)",
                    info="Enter city name or coordinates. Browser location takes priority if both are provided."
                )
            
            # Submit button
            submit_btn = gr.Button(
                "🔍 Get Recommendations",
                variant="primary",
                size="lg"
            )
            
        with gr.Column(scale=1):
            # Output section
            gr.Markdown("## 🎯 Recommendations")
            
            output = gr.Textbox(
                label="Your Personalized Recommendations",
                placeholder="Your recommendations will appear here...",
                lines=20,
                max_lines=30,
                show_copy_button=True
            )
    
    # JavaScript function to get location - this runs in the user's browser, not on the server
    get_location_btn.click(
        fn=None,
        inputs=[],
        outputs=[browser_location, location_status],
        js="""
        () => {
            return new Promise((resolve) => {
                if (!navigator.geolocation) {
                    resolve(["", "❌ **Location Error:** Geolocation is not supported by your browser."]);
                    return;
                }
                
                // Show loading status immediately
                const loadingStatus = "🔄 **Getting your location...** Please allow location access when prompted.";
                
                navigator.geolocation.getCurrentPosition(
                    function(position) {
                        const lat = position.coords.latitude;
                        const lng = position.coords.longitude;
                        const accuracy = Math.round(position.coords.accuracy);
                        
                        // Format: lat,lng,accuracy for easy parsing
                        const locationData = `${lat},${lng},${accuracy}`;
                        const statusMsg = `✅ **Location detected successfully!**\\n📍 Coordinates: ${lat.toFixed(4)}, ${lng.toFixed(4)}\\n🎯 Accuracy: ±${accuracy} meters`;
                        
                        resolve([locationData, statusMsg]);
                    },
                    function(error) {
                        let errorMsg = "❌ **Location Error:** ";
                        switch(error.code) {
                            case error.PERMISSION_DENIED:
                                errorMsg += "You denied location access. Please enable location permissions in your browser settings and try again.";
                                break;
                            case error.POSITION_UNAVAILABLE:
                                errorMsg += "Location information is unavailable. Please check your GPS/location services.";
                                break;
                            case error.TIMEOUT:
                                errorMsg += "Location request timed out. Please try again.";
                                break;
                            default:
                                errorMsg += "An unknown error occurred while getting your location.";
                                break;
                        }
                        resolve(["", errorMsg]);
                    },
                    {
                        enableHighAccuracy: true,
                        timeout: 15000,  // 15 seconds
                        maximumAge: 300000  // 5 minutes cache
                    }
                );
            });
        }
        """
    )
    
    # Submit button click
    submit_btn.click(
        get_tourism_recommendations,
        inputs=[interests_input, location_input, browser_location, api_key_input],
        outputs=[output]
    )
    
    # Enter key support
    interests_input.submit(
        get_tourism_recommendations,
        inputs=[interests_input, location_input, browser_location, api_key_input],
        outputs=[output]
    )
    
    # Footer
    gr.Markdown(
        """
        ---
        <div style="text-align: center; color: #666;">
            <small>Powered by CrewAI • Built with Gradio • Secure API handling • Browser-based location detection</small>
        </div>
        """
    )

# Launch the interface
if __name__ == "__main__":
    demo.launch(
        server_name="0.0.0.0",
        server_port=7860,
        share=False,
        debug=True)