import json
import os
import yaml

from config import Config
from renderer import Renderer
from structure import Structure
from xml_loader import XMLLoader

class UnsupportedFormatException(Exception):
    ...

class InstructionSetSchema:
    VALID_EXTENSIONS = ("yaml", "json", "xml")
    
    def __init__(self, path: str, configPath: str = "config.json", display: bool = False) -> None:
        self.config = Config(configPath)
        self.display = display
        self.path = path
        self.load()
    
    def load(self) -> None:
        _, ext = os.path.splitext(self.path)
        ext = ext[1:].lower()
        
        if ext not in InstructionSetSchema.VALID_EXTENSIONS:
            fmts = tuple(map(lambda fmt: f".{fmt}", InstructionSetSchema.VALID_EXTENSIONS))
            raise UnsupportedFormatException(f"'.{ext}' files are not supported. Valid formats: {fmts}")
        
        with open(self.path, "r") as f:
            if ext == "yaml":
                schema = yaml.safe_load(f)
        
            elif ext == "json":
                schema = json.load(f)
            
            elif ext == "xml":
                schema = XMLLoader.load(f)

        self.structures = {}
        
        for id_, data in schema["structures"].items():
            id_ = str(id_)
            self.structures[id_] = Structure.load(id_, data)
    
    def save(self, path: str) -> None:
        renderer = Renderer(self.config, self.display)
        renderer.render(self)
        renderer.save(path)
        if self.display:
            input("Press ENTER to quit")