class PatternMeta:
    def __init__(self, id, name, frames, pixels, flags, fps):
        self.id = id
        self.name = name
        self.frames = frames
        self.pixels = pixels
        self.flags = flags
        self.fps = fps

    def to_json(self):
        return {
            "id": self.id, "name": self.name, "frames": self.frames,
            "pixels": self.pixels, "flags": self.flags, "fps": self.fps
        }

    @classmethod
    def from_json(cls, json):
        return cls(
            json["id"], json["name"], json["frames"],
            json["pixels"], json["flags"], json["fps"]
        )


class PatternBuilder:
    def __init__(self, name, fps=1):
        self.pixels = []
        self.name = name
        self.fps = fps
        self.frame_count = 1
        self.pixel_count = 0
        self.frame_pixels = 0

    def add_pixel(self, r, g, b):
        if self.frame_count == 1:
            self.pixel_count += 1

        self.frame_pixels += 1
        self.pixels += [r, g, b]

    def next_frame(self):
        self.frame_count += 1
        self.frame_pixels = 0

    def is_valid(self):
        self.frame_pixels == self.pixel_count

    def to_binary_string(self):
        return ''.join([chr(item) for item in self.pixels])