import json

class Project:
    def __init__(self):
        self.chars={}
        self.char_res=(0,0)
        self.path=None
        self.loaded=False


    def load(self,path):
        with open(path, "r") as f:
            project_data = json.load(f)
            if not "char_width" in project_data or not "char_height" in project_data:
                raise AttributeError("Character metrics information not found")
            if not isinstance(project_data["char_width"],int) or not isinstance(project_data["char_height"],int):
                raise AttributeError("Invalid character metrics type, expected int")
            if not "chars" in project_data:
                raise AttributeError("Character data not found")
            if not isinstance(project_data["chars"],dict):
                raise AttributeError("Invalid character data type, expected object")
            self.chars=project_data["chars"]
            self.char_res=(project_data["char_width"],project_data["char_height"])
            self.path=path
            self.loaded=True


    def save(self,path):
        # save project data to file
        with open(path, "w") as f:
            json.dump({
                "char_width": self.char_res[0],
                "char_height": self.char_res[1],
                "chars": self.chars
            }, f, indent=4)
        self.path=path
        self.loaded=True


    def does_char_exist(self,c):
        return chr(c) in self.chars