import json
from pathlib import Path

from constellaration import problems
from constellaration.geometry import surface_rz_fourier

PROBLEM_TYPES = ["geometrical", "simple_to_build", "mhd_stable"]

def load_boundary(data: str) -> surface_rz_fourier.SurfaceRZFourier:
    return surface_rz_fourier.SurfaceRZFourier.model_validate_json(data)

def load_boundaries(data: str) -> list[surface_rz_fourier.SurfaceRZFourier]:
    data_json = json.loads(data)
    return [
        surface_rz_fourier.SurfaceRZFourier.model_validate_json(b) for b in data_json
    ]

def evaluate_problem(
    problem_type: str, input_file: str
) -> problems.EvaluationSingleObjective | problems.EvaluationMultiObjective:
    with Path(input_file).open("r") as f:
        raw = f.read()
        data_dict = json.loads(raw)
        data = data_dict['boundary_json']

    match problem_type:
        case "geometrical":
            boundary = load_boundary(data)
            result = problems.GeometricalProblem().evaluate(boundary)
        case "simple_to_build":
            boundary = load_boundary(data)
            result = problems.SimpleToBuildQIStellarator().evaluate(boundary)
        case "mhd_stable":
            boundaries = load_boundaries(data)
            result = problems.MHDStableQIStellarator().evaluate(boundaries)
        case _:
            raise ValueError(f"Unknown problem type: {problem_type}")
    return result