#!/usr/bin/env python3
"""
VFD Module Boilerplate Model
============================

Model for VFD (Variable Frequency Drive) modules with support for different horsepower ratings.
Supports 15, 20, and 30 HP variants.
"""

from typing import Optional, TYPE_CHECKING
import xml.etree.ElementTree as ET
from dataclasses import dataclass
from datetime import datetime
import os

if TYPE_CHECKING:
    from excel_data_processor import ModuleData

from .mcm_pattern_utils import get_parent_for_vfd, check_and_register_en4tr_for_device


@dataclass
class VFDModuleConfig:
    """Configuration for a VFD module instance."""
    name: str  # Module name (e.g., "VFD1")
    hp: str  # Horsepower rating: "15", "20", "30"
    ip_address: str = "11.200.1.10"
    parent_module: str = "SLOT2_EN4TR"
    parent_port_id: str = "2"


class VFDModuleGenerator:
    """Generator for VFD module XML with different HP support."""
    
    # Mapping of HP values to boilerplate filenames
    HP_BOILERPLATE_MAP = {
        "15": "VFD_Module_15_HP.L5X",
        "20": "VFD_Module_20_HP.L5X",
        "30": "VFD_Module_30_HP.L5X"
    }
    
    def __init__(self, config: VFDModuleConfig):
        self.config = config
        
        # Determine the correct boilerplate file
        if self.config.hp not in self.HP_BOILERPLATE_MAP:
            raise ValueError(f"Unsupported HP value: {self.config.hp}. Supported values: 15, 20, 30")
        
        self.boilerplate_filename = self.HP_BOILERPLATE_MAP[self.config.hp]
        # Use project-specific boilerplate directory if set, otherwise default
        boilerplate_dir = os.environ.get('MCM_BOILERPLATE_DIR', 'boilerplate')
        self.boilerplate_path = os.path.join(boilerplate_dir, self.boilerplate_filename)
        self.tree = None
        self.root = None
        
    def load_boilerplate(self):
        """Load the appropriate boilerplate template based on HP rating."""
        if not os.path.exists(self.boilerplate_path):
            raise FileNotFoundError(f"Boilerplate file not found: {self.boilerplate_path}")
        
        self.tree = ET.parse(self.boilerplate_path)
        self.root = self.tree.getroot()
        
    def update_module_name(self):
        """Update the module name throughout the XML."""
        # Update in root attributes
        self.root.set("TargetName", self.config.name)
        
        # Update Module element
        module = self.root.find(".//Module[@Use='Target']")
        if module is not None:
            module.set("Name", self.config.name)
            
    def update_ip_address(self):
        """Update the IP address in the Ethernet port."""
        port = self.root.find(".//Port[@Type='Ethernet']")
        if port is not None:
            port.set("Address", self.config.ip_address)
            
    def update_parent_module(self):
        """Update parent module references."""
        module = self.root.find(".//Module[@Use='Target']")
        if module is not None:
            module.set("ParentModule", self.config.parent_module)
            module.set("ParentModPortId", self.config.parent_port_id)
            
    def update_export_date(self):
        """Update the export date to current time."""
        export_date = datetime.now().strftime("%a %b %d %H:%M:%S %Y")
        self.root.set("ExportDate", export_date)
        
    def apply_updates(self):
        """Apply all updates to the boilerplate."""
        self.update_module_name()
        self.update_ip_address()
        self.update_parent_module()
        self.update_export_date()
        
    def save(self, output_path: str):
        """Save the updated module to file."""
        if self.tree is None:
            raise RuntimeError("No boilerplate loaded. Call load_boilerplate() first.")
        
        # Save with proper formatting
        self.tree.write(output_path, encoding='UTF-8', xml_declaration=True)
        
    def get_xml_string(self) -> str:
        """Get the XML as a string."""
        if self.tree is None:
            raise RuntimeError("No boilerplate loaded. Call load_boilerplate() first.")
        
        return ET.tostring(self.root, encoding='unicode')

    # ------------------------------------------------------------------
    # Helper for EnhancedMCMGenerator refactor
    # ------------------------------------------------------------------

    @classmethod
    def from_excel(cls, module_data: 'ModuleData', hp: str, parent_module: str = None) -> 'VFDModuleGenerator':
        # Determine parent module using pattern matching if not explicitly provided
        if parent_module is None:
            has_ip = bool(module_data.ip_address and module_data.ip_address.strip())
            parent_module = check_and_register_en4tr_for_device(module_data.tagname, has_ip_address=has_ip)
            
        cfg = create_vfd_module(
            name=module_data.tagname,
            hp=hp,
            ip_address=module_data.ip_address or "11.200.1.10",
            parent_module=parent_module,
            parent_port_id="2",
        )
        gen = cls(cfg)
        gen.load_boilerplate()
        gen.apply_updates()
        return gen


def create_vfd_module(name: str, hp: str, ip_address: str = "11.200.1.10",
                     parent_module: str = "SLOT2_EN4TR", parent_port_id: str = "2") -> VFDModuleConfig:
    """Factory function to create a VFD module configuration."""
    return VFDModuleConfig(
        name=name,
        hp=hp,
        ip_address=ip_address,
        parent_module=parent_module,
        parent_port_id=parent_port_id
    )


# Example usage
if __name__ == "__main__":
    # Example: Create a 15 HP VFD module
    config = create_vfd_module(
        name="VFD1_15HP",
        hp="15",  # Specify the horsepower
        ip_address="11.200.1.10",
        parent_module="SLOT2_EN4TR"
    )
    
    generator = VFDModuleGenerator(config)
    generator.load_boilerplate()
    generator.apply_updates()
    generator.save("generated/VFD1_15HP.L5X")
    
    print(f"Generated {config.hp} HP VFD module: {config.name}")