"""Shared helpers for scripts/plots/*.py."""
import json
from pathlib import Path

ROOT = Path(__file__).parent.parent.parent
DATA_DIR = ROOT / "data"
OUT_DIR = ROOT / "assets"

# Kept consistent across figures so e.g. batch C is the same color everywhere.
BATCH_COLORS = {
    "A": "#1f77b4",  # blue
    "B": "#ff7f0e",  # orange
    "C": "#2ca02c",  # green
    "D": "#d62728",  # red
    "E": "#9467bd",  # purple
    "F": "#8c564b",  # brown
    "G": "#e377c2",  # pink
    "H": "#bcbd22",  # olive
    "I": "#17becf",  # cyan
    "J": "#aec7e8",  # light blue
    "J_MB": "#08519c",  # dark blue (media blasted variant of Batch J)
    "K": "#98df8a",  # light green
    "L": "#ff9896",  # light red
}
CONTROL_COLOR = "#7f7f7f"  # gray for PLA/PETG

MATERIAL_STYLES = {"SLS": "-", "PLA": "--", "PETG": ":"}

FILAMENT_CONTROLS = {"PLA", "PETG"}


def load_specimen(path: Path) -> dict | None:
    with path.open() as f:
        row = json.loads(f.readline())
    pairs = [
        (s, t)
        for s, t in zip(row["curves"]["strain"], row["curves"]["stress_pa"])
        if s is not None and t is not None
    ]
    if not pairs:
        return None
    strain, stress_pa = zip(*pairs)
    return {
        "row": row,
        "strain": list(strain),
        "stress_mpa": [t / 1e6 for t in stress_pa],
    }


def load_standard(standard: str) -> list[dict]:
    """Load every specimen with a non-empty curve for a config."""
    paths = sorted((DATA_DIR / standard).glob("*.jsonl"))
    return [s for p in paths if (s := load_specimen(p))]


def style_for(row: dict) -> tuple[str, str]:
    material = row["material_class"]
    batch = row["batch_label"]
    color = BATCH_COLORS.get(batch, CONTROL_COLOR) if batch else CONTROL_COLOR
    linestyle = MATERIAL_STYLES.get(material, "-")
    return color, linestyle