import json
import os
from pathlib import Path
import shutil
import luigi
from engine.utils import ensure_dir


class ImageWriter(luigi.Task):
    artifacts_dir = luigi.Parameter(default="artifacts")

    def requires(self):
        from engine.tasks_radiomics import FeatureExtraction
        return FeatureExtraction(artifacts_dir=self.artifacts_dir)

    def output(self):
        return luigi.LocalTarget(os.path.join(self.artifacts_dir, "final_output.json"))

    def run(self):
        # Copy Excel file generated by PySERA to artifacts/radiomics3d
        excel_src = Path(self.artifacts_dir) / "Radiomics_Results.xlsx"
        if excel_src.exists():
            dst_dir = ensure_dir(Path(self.artifacts_dir) / "radiomics3d")
            excel_dst = dst_dir / "Radiomics_Results.xlsx"
            shutil.copy2(excel_src, excel_dst)

        # Load summary JSON from FeatureExtraction
        with self.requires().output().open("r") as f:
            summary = json.load(f)

        # Write final summary JSON
        with self.output().open("w") as f:
            json.dump(summary, f, indent=2, ensure_ascii=False)