"""
Area calculation system module for HVAC Load Calculator.
This module implements net wall area calculation and area validation functions.
"""

from typing import Dict, List, Any, Optional, Tuple
import pandas as pd
import numpy as np
import os
import json
from dataclasses import dataclass, field

# Import data models
from data.building_components import Wall, Window, Door, Orientation, ComponentType

# Define paths
DATA_DIR = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))


class AreaCalculationSystem:
    """Class for managing area calculations and validations."""
    
    def __init__(self):
        """Initialize area calculation system."""
        self.walls = {}
        self.windows = {}
        self.doors = {}
    
    def add_wall(self, wall: Wall) -> None:
        """
        Add a wall to the area calculation system.
        
        Args:
            wall: Wall object
        """
        self.walls[wall.id] = wall
    
    def add_window(self, window: Window) -> None:
        """
        Add a window to the area calculation system.
        
        Args:
            window: Window object
        """
        self.windows[window.id] = window
    
    def add_door(self, door: Door) -> None:
        """
        Add a door to the area calculation system.
        
        Args:
            door: Door object
        """
        self.doors[door.id] = door
    
    def remove_wall(self, wall_id: str) -> bool:
        """
        Remove a wall from the area calculation system.
        
        Args:
            wall_id: Wall identifier
            
        Returns:
            True if the wall was removed, False otherwise
        """
        if wall_id not in self.walls:
            return False
        
        # Remove all windows and doors associated with this wall
        for window_id, window in list(self.windows.items()):
            if window.wall_id == wall_id:
                del self.windows[window_id]
        
        for door_id, door in list(self.doors.items()):
            if door.wall_id == wall_id:
                del self.doors[door_id]
        
        del self.walls[wall_id]
        return True
    
    def remove_window(self, window_id: str) -> bool:
        """
        Remove a window from the area calculation system.
        
        Args:
            window_id: Window identifier
            
        Returns:
            True if the window was removed, False otherwise
        """
        if window_id not in self.windows:
            return False
        
        # Remove window from associated wall
        window = self.windows[window_id]
        if window.wall_id and window.wall_id in self.walls:
            wall = self.walls[window.wall_id]
            if window_id in wall.windows:
                wall.windows.remove(window_id)
                self._update_wall_net_area(wall.id)
        
        del self.windows[window_id]
        return True
    
    def remove_door(self, door_id: str) -> bool:
        """
        Remove a door from the area calculation system.
        
        Args:
            door_id: Door identifier
            
        Returns:
            True if the door was removed, False otherwise
        """
        if door_id not in self.doors:
            return False
        
        # Remove door from associated wall
        door = self.doors[door_id]
        if door.wall_id and door.wall_id in self.walls:
            wall = self.walls[door.wall_id]
            if door_id in wall.doors:
                wall.doors.remove(door_id)
                self._update_wall_net_area(wall.id)
        
        del self.doors[door_id]
        return True
    
    def assign_window_to_wall(self, window_id: str, wall_id: str) -> bool:
        """
        Assign a window to a wall.
        
        Args:
            window_id: Window identifier
            wall_id: Wall identifier
            
        Returns:
            True if the window was assigned, False otherwise
        """
        if window_id not in self.windows or wall_id not in self.walls:
            return False
        
        window = self.windows[window_id]
        wall = self.walls[wall_id]
        
        # Remove window from previous wall if assigned
        if window.wall_id and window.wall_id in self.walls and window.wall_id != wall_id:
            prev_wall = self.walls[window.wall_id]
            if window_id in prev_wall.windows:
                prev_wall.windows.remove(window_id)
                self._update_wall_net_area(prev_wall.id)
        
        # Assign window to new wall
        window.wall_id = wall_id
        window.orientation = wall.orientation
        
        # Add window to wall's window list if not already there
        if window_id not in wall.windows:
            wall.windows.append(window_id)
        
        # Update wall net area
        self._update_wall_net_area(wall_id)
        
        return True
    
    def assign_door_to_wall(self, door_id: str, wall_id: str) -> bool:
        """
        Assign a door to a wall.
        
        Args:
            door_id: Door identifier
            wall_id: Wall identifier
            
        Returns:
            True if the door was assigned, False otherwise
        """
        if door_id not in self.doors or wall_id not in self.walls:
            return False
        
        door = self.doors[door_id]
        wall = self.walls[wall_id]
        
        # Remove door from previous wall if assigned
        if door.wall_id and door.wall_id in self.walls and door.wall_id != wall_id:
            prev_wall = self.walls[door.wall_id]
            if door_id in prev_wall.doors:
                prev_wall.doors.remove(door_id)
                self._update_wall_net_area(prev_wall.id)
        
        # Assign door to new wall
        door.wall_id = wall_id
        door.orientation = wall.orientation
        
        # Add door to wall's door list if not already there
        if door_id not in wall.doors:
            wall.doors.append(door_id)
        
        # Update wall net area
        self._update_wall_net_area(wall_id)
        
        return True
    
    def _update_wall_net_area(self, wall_id: str) -> None:
        """
        Update the net area of a wall by subtracting windows and doors.
        
        Args:
            wall_id: Wall identifier
        """
        if wall_id not in self.walls:
            return
        
        wall = self.walls[wall_id]
        
        # Calculate total window area
        total_window_area = sum(self.windows[window_id].area 
                               for window_id in wall.windows 
                               if window_id in self.windows)
        
        # Calculate total door area
        total_door_area = sum(self.doors[door_id].area 
                             for door_id in wall.doors 
                             if door_id in self.doors)
        
        # Update wall net area
        if wall.gross_area is None:
            wall.gross_area = wall.area
        
        wall.net_area = wall.gross_area - total_window_area - total_door_area
        wall.area = wall.net_area  # Update the main area property
    
    def update_all_net_areas(self) -> None:
        """Update the net areas of all walls."""
        for wall_id in self.walls:
            self._update_wall_net_area(wall_id)
    
    def validate_areas(self) -> List[Dict[str, Any]]:
        """
        Validate all areas and return a list of validation issues.
        
        Returns:
            List of validation issues
        """
        issues = []
        
        # Check for negative or zero net wall areas
        for wall_id, wall in self.walls.items():
            if wall.net_area <= 0:
                issues.append({
                    "type": "error",
                    "component_id": wall_id,
                    "component_type": "Wall",
                    "message": f"Wall '{wall.name}' has a negative or zero net area. "
                              f"Gross area: {wall.gross_area} m², "
                              f"Window area: {sum(self.windows[window_id].area for window_id in wall.windows if window_id in self.windows)} m², "
                              f"Door area: {sum(self.doors[door_id].area for door_id in wall.doors if door_id in self.doors)} m², "
                              f"Net area: {wall.net_area} m²."
                })
            elif wall.net_area < 0.5:
                issues.append({
                    "type": "warning",
                    "component_id": wall_id,
                    "component_type": "Wall",
                    "message": f"Wall '{wall.name}' has a very small net area ({wall.net_area} m²). "
                              f"Consider adjusting window and door sizes."
                })
        
        # Check for windows without walls
        for window_id, window in self.windows.items():
            if not window.wall_id:
                issues.append({
                    "type": "warning",
                    "component_id": window_id,
                    "component_type": "Window",
                    "message": f"Window '{window.name}' is not assigned to any wall."
                })
            elif window.wall_id not in self.walls:
                issues.append({
                    "type": "error",
                    "component_id": window_id,
                    "component_type": "Window",
                    "message": f"Window '{window.name}' is assigned to a non-existent wall (ID: {window.wall_id})."
                })
        
        # Check for doors without walls
        for door_id, door in self.doors.items():
            if not door.wall_id:
                issues.append({
                    "type": "warning",
                    "component_id": door_id,
                    "component_type": "Door",
                    "message": f"Door '{door.name}' is not assigned to any wall."
                })
            elif door.wall_id not in self.walls:
                issues.append({
                    "type": "error",
                    "component_id": door_id,
                    "component_type": "Door",
                    "message": f"Door '{door.name}' is assigned to a non-existent wall (ID: {door.wall_id})."
                })
        
        # Check for windows and doors with zero area
        for window_id, window in self.windows.items():
            if window.area <= 0:
                issues.append({
                    "type": "error",
                    "component_id": window_id,
                    "component_type": "Window",
                    "message": f"Window '{window.name}' has a zero or negative area ({window.area} m²)."
                })
        
        for door_id, door in self.doors.items():
            if door.area <= 0:
                issues.append({
                    "type": "error",
                    "component_id": door_id,
                    "component_type": "Door",
                    "message": f"Door '{door.name}' has a zero or negative area ({door.area} m²)."
                })
        
        return issues
    
    def get_wall_components(self, wall_id: str) -> Dict[str, List[str]]:
        """
        Get all components (windows and doors) associated with a wall.
        
        Args:
            wall_id: Wall identifier
            
        Returns:
            Dictionary with lists of window and door IDs
        """
        if wall_id not in self.walls:
            return {"windows": [], "doors": []}
        
        wall = self.walls[wall_id]
        return {
            "windows": [window_id for window_id in wall.windows if window_id in self.windows],
            "doors": [door_id for door_id in wall.doors if door_id in self.doors]
        }
    
    def get_wall_area_breakdown(self, wall_id: str) -> Dict[str, float]:
        """
        Get a breakdown of wall areas (gross, net, windows, doors).
        
        Args:
            wall_id: Wall identifier
            
        Returns:
            Dictionary with area breakdown
        """
        if wall_id not in self.walls:
            return {}
        
        wall = self.walls[wall_id]
        
        # Calculate total window area
        window_area = sum(self.windows[window_id].area 
                         for window_id in wall.windows 
                         if window_id in self.windows)
        
        # Calculate total door area
        door_area = sum(self.doors[door_id].area 
                       for door_id in wall.doors 
                       if door_id in self.doors)
        
        return {
            "gross_area": wall.gross_area,
            "net_area": wall.net_area,
            "window_area": window_area,
            "door_area": door_area
        }
    
    def get_total_areas(self) -> Dict[str, float]:
        """
        Get total areas for all component types.
        
        Returns:
            Dictionary with total areas
        """
        # Calculate total wall areas
        total_wall_gross_area = sum(wall.gross_area for wall in self.walls.values() if wall.gross_area is not None)
        total_wall_net_area = sum(wall.net_area for wall in self.walls.values() if wall.net_area is not None)
        
        # Calculate total window area
        total_window_area = sum(window.area for window in self.windows.values())
        
        # Calculate total door area
        total_door_area = sum(door.area for door in self.doors.values())
        
        return {
            "total_wall_gross_area": total_wall_gross_area,
            "total_wall_net_area": total_wall_net_area,
            "total_window_area": total_window_area,
            "total_door_area": total_door_area
        }
    
    def get_areas_by_orientation(self) -> Dict[str, Dict[str, float]]:
        """
        Get areas for all component types grouped by orientation.
        
        Returns:
            Dictionary with areas by orientation
        """
        # Initialize result dictionary
        result = {}
        
        # Process walls
        for wall in self.walls.values():
            orientation = wall.orientation.value
            if orientation not in result:
                result[orientation] = {
                    "wall_gross_area": 0,
                    "wall_net_area": 0,
                    "window_area": 0,
                    "door_area": 0
                }
            
            result[orientation]["wall_gross_area"] += wall.gross_area if wall.gross_area is not None else 0
            result[orientation]["wall_net_area"] += wall.net_area if wall.net_area is not None else 0
        
        # Process windows
        for window in self.windows.values():
            orientation = window.orientation.value
            if orientation not in result:
                result[orientation] = {
                    "wall_gross_area": 0,
                    "wall_net_area": 0,
                    "window_area": 0,
                    "door_area": 0
                }
            
            result[orientation]["window_area"] += window.area
        
        # Process doors
        for door in self.doors.values():
            orientation = door.orientation.value
            if orientation not in result:
                result[orientation] = {
                    "wall_gross_area": 0,
                    "wall_net_area": 0,
                    "window_area": 0,
                    "door_area": 0
                }
            
            result[orientation]["door_area"] += door.area
        
        return result
    
    def export_to_json(self, file_path: str) -> None:
        """
        Export all components to a JSON file.
        
        Args:
            file_path: Path to the output JSON file
        """
        data = {
            "walls": {wall_id: wall.to_dict() for wall_id, wall in self.walls.items()},
            "windows": {window_id: window.to_dict() for window_id, window in self.windows.items()},
            "doors": {door_id: door.to_dict() for door_id, door in self.doors.items()}
        }
        
        with open(file_path, 'w') as f:
            json.dump(data, f, indent=4)
    
    def import_from_json(self, file_path: str) -> Tuple[int, int, int]:
        """
        Import components from a JSON file.
        
        Args:
            file_path: Path to the input JSON file
            
        Returns:
            Tuple with counts of walls, windows, and doors imported
        """
        from data.building_components import BuildingComponentFactory
        
        with open(file_path, 'r') as f:
            data = json.load(f)
        
        wall_count = 0
        window_count = 0
        door_count = 0
        
        # Import walls
        for wall_id, wall_data in data.get("walls", {}).items():
            try:
                wall = BuildingComponentFactory.create_component(wall_data)
                self.walls[wall_id] = wall
                wall_count += 1
            except Exception as e:
                print(f"Error importing wall {wall_id}: {e}")
        
        # Import windows
        for window_id, window_data in data.get("windows", {}).items():
            try:
                window = BuildingComponentFactory.create_component(window_data)
                self.windows[window_id] = window
                window_count += 1
            except Exception as e:
                print(f"Error importing window {window_id}: {e}")
        
        # Import doors
        for door_id, door_data in data.get("doors", {}).items():
            try:
                door = BuildingComponentFactory.create_component(door_data)
                self.doors[door_id] = door
                door_count += 1
            except Exception as e:
                print(f"Error importing door {door_id}: {e}")
        
        # Update all net areas
        self.update_all_net_areas()
        
        return (wall_count, window_count, door_count)


# Create a singleton instance
area_calculation_system = AreaCalculationSystem()

# Export area calculation system to JSON if needed
if __name__ == "__main__":
    area_calculation_system.export_to_json(os.path.join(DATA_DIR, "data", "area_calculation_system.json"))