import importlib
import pathlib
import typing as t

import mlx.core as mx
import PIL.Image

from mflux.config.model_config import ModelConfig


class GeneratedImage:
    def __init__(
        self,
        image: PIL.Image.Image,
        model_config: ModelConfig,
        seed: int,
        prompt: str,
        steps: int,
        guidance: float | None,
        precision: mx.Dtype,
        quantization: int,
        generation_time: float,
        lora_paths: list[str],
        lora_scales: list[float],
        controlnet_image_path: str | pathlib.Path | None = None,
        controlnet_strength: float | None = None,
        init_image_path: str | pathlib.Path | None = None,
        init_image_strength: float | None = None,
    ):
        self.image = image
        self.model_config = model_config
        self.seed = seed
        self.prompt = prompt
        self.steps = steps
        self.guidance = guidance
        self.precision = precision
        self.quantization = quantization
        self.generation_time = generation_time
        self.lora_paths = lora_paths
        self.lora_scales = lora_scales
        self.controlnet_image_path = controlnet_image_path
        self.controlnet_strength = controlnet_strength
        self.init_image_path = init_image_path
        self.init_image_strength = init_image_strength

    def save(self, path: t.Union[str, pathlib.Path], export_json_metadata: bool = False) -> None:
        from mflux import ImageUtil

        ImageUtil.save_image(self.image, path, self._get_metadata(), export_json_metadata)

    def _get_metadata(self) -> dict:
        """Generate metadata for reference as well as input data for
        command line --config-from-metadata arg in future generations.
        """
        return {
            # mflux_version is used by future metadata readers
            # to determine supportability of metadata-derived workflows
            "mflux_version": str(GeneratedImage.get_version()),
            "model": str(self.model_config.alias),
            "seed": self.seed,
            "steps": self.steps,
            "guidance": self.guidance if ModelConfig.FLUX1_DEV else None,  # only the dev model supports guidance
            "precision": str(self.precision),
            "quantize": self.quantization,
            "generation_time_seconds": round(self.generation_time, 2),
            "lora_paths": [str(p) for p in self.lora_paths] if self.lora_paths else None,
            "lora_scales": [round(scale, 2) for scale in self.lora_scales] if self.lora_scales else None,
            "init_image_path": str(self.init_image_path) if self.init_image_path else None,
            "init_image_strength": self.init_image_strength if self.init_image_path else None,
            "controlnet_image_path": str(self.controlnet_image_path) if self.controlnet_image_path else None,
            "controlnet_strength": round(self.controlnet_strength, 2) if self.controlnet_strength else None,
            "prompt": self.prompt,
        }

    @staticmethod
    def get_version():
        try:
            return importlib.metadata.version("mflux")
        except importlib.metadata.PackageNotFoundError:
            return "unknown"