#!/usr/bin/env python3
"""Apply the frozen A1 exact-BP viability gate."""
import argparse
import json
import math
import os


def read(path, variant):
    with open(path) as handle:
        record = json.load(handle)
    args = record["args"]
    expected = {
        "mode": "bp", "depth": 20, "width": 16, "seed": 0,
        "epochs": 200, "val_examples": 5000, "eval_split": "validation",
        "normalization": "batchnorm",
    }
    for key, value in expected.items():
        if args.get(key) != value:
            raise ValueError(f"{path}: {key}={args.get(key)!r}, expected {value!r}")
    if record["provenance"]["git_tracked_dirty"]:
        raise ValueError(f"tracked-dirty result: {path}")
    if record["split"]["validation_index_sha256"] != (
            "8328b206a97c420e49e54e3eca4abe3274c4756b084355784ea3fb8059e4515b"):
        raise ValueError(f"split drift: {path}")
    accuracy = float(record["final"]["accuracy"])
    loss = float(record["final"]["loss"])
    return {
        "variant": variant, "path": path,
        "source_commit": record["provenance"]["git_commit"],
        "accuracy": accuracy, "loss": loss,
        "finite": record["final"]["finite"] and math.isfinite(accuracy + loss),
        "test_evaluations": record["evaluation_protocol"]["test_evaluations"],
    }


def main():
    parser = argparse.ArgumentParser()
    parser.add_argument("--primary", default="results/oral_a_dev/bp_reference_primary.json")
    parser.add_argument("--recovery", default="results/oral_a_dev/bp_reference_recovery.json")
    parser.add_argument("--out", default="results/oral_a_bp_selection.json")
    args = parser.parse_args()
    primary = read(args.primary, "primary")
    rows = [primary]
    if primary["finite"] and primary["accuracy"] >= 0.90:
        status = "passed_primary"
        selected = primary
    elif not os.path.exists(args.recovery):
        status = "recovery_required"
        selected = None
    else:
        recovery = read(args.recovery, "recovery")
        rows.append(recovery)
        selected = max(rows, key=lambda row: row["accuracy"] if row["finite"] else -1.0)
        status = ("passed_recovery" if selected["finite"] and selected["accuracy"] >= 0.90
                  else "failed_no_viable_reference")
    if any(row["test_evaluations"] for row in rows):
        raise ValueError("A1 must not evaluate test")
    output = {
        "protocol": "oral_a_A1_v1", "status": status,
        "rows": rows, "selected": selected,
        "confirmation_test_seeds_touched": False,
    }
    os.makedirs(os.path.dirname(os.path.abspath(args.out)), exist_ok=True)
    with open(args.out, "w") as handle:
        json.dump(output, handle, indent=2, sort_keys=True)
        handle.write("\n")
    print(json.dumps(output, indent=2))


if __name__ == "__main__":
    main()