"""Version 1: invented inventory facts; disjoint entities, same task templates.

This corpus checks wiring and learning only. It is not a generalization benchmark.
Each entity yields three questions sharing its state. Candidate order is seeded.
"""
import random

VERSION = "inventory-v1"
COLORS = ["red", "blue", "green", "yellow"]


def make_split(split, groups, seed):
    rng = random.Random(seed)
    examples = []
    for i in range(groups):
        color = COLORS[i % 4]
        count = (i * 3 + i // 4) % 9
        sealed = (i // 2) % 2 == 0
        entity = f"{split.upper()}-{i:03d}"
        state = (f"Inventory record for parcel {entity}. The label is {color}. "
                 f"It contains {count} metal washers. The seal is "
                 f"{'intact' if sealed else 'broken'}. The destination is shelf {(i * 7) % 13}.")
        tasks = [
            ("color", "What color is the parcel label?", COLORS[:], color),
            ("seal", "Is the parcel seal intact?", ["yes", "no"], "yes" if sealed else "no"),
            ("quantity", "How many washers does the parcel contain?", 
             ["none", "one to four", "five or more"],
             "none" if count == 0 else "one to four" if count < 5 else "five or more"),
        ]
        for task, question, choices, correct in tasks:
            rng.shuffle(choices)
            examples.append({"id": f"{entity}-{task}", "group": entity,
                             "family": task, "state": state, "question": question,
                             "choices": choices, "target": choices.index(correct)})
    rng.shuffle(examples)
    return examples


def make_data():
    return {"train": make_split("train", 64, 101),
            "calibration": make_split("calibration", 16, 202),
            "test": make_split("test", 24, 303)}