"""CLI entry for regenerating the 24-family synthetic sweep.

    cd corpus
    PYTHONDONTWRITEBYTECODE=1 PYTHONPATH=. python3 -m generator.run \
        --base-seed 20260609 --out reproduced_sweep \
        [--family NAME ...] [--dry-run] [--persist-all] [--max-per-family N]

Order of operations: anchors gate (abort on drift) -> fixed-cell probe suite
(abort on failure) -> per-family generation with per-instance validation gates
(schema gate aborts; stage-invariant violations are flagged + surfaced, never
dropped) -> per-family summary.json -> top-level run_summary.json.

--max-per-family N evaluates an evenly strided subset of each family while
preserving the true instance_index, and therefore the per-instance seed, of
every kept instance.
"""

from __future__ import annotations

import argparse
import hashlib
import json
import sys
import time
from datetime import datetime, timezone
from pathlib import Path

import numpy as np

# Paths are resolved against the repository root, so the generator imports the
# evaluator and validation assets shipped alongside it. The AAAI supplement
# ships the same modules with a "framework/" segment inserted here.
REPO_ROOT = Path(__file__).resolve().parents[2]
SRC = REPO_ROOT / "src"
if str(SRC) not in sys.path:
    sys.path.insert(0, str(SRC))

from datacenter_verification.observable_algorithm import ALGORITHM_VERSION, THRESHOLDS, evaluate_site  # noqa: E402

from . import GENERATOR_VERSION, anchors, families, metrics, schema, selfcheck  # noqa: E402
from .seeding import DEFAULT_BASE_SEED, RNG_NAME  # noqa: E402

ALGORITHM_PATH = SRC / "datacenter_verification" / "observable_algorithm.py"


def parse_args(argv=None):
    parser = argparse.ArgumentParser(prog="python -m generator.run", description=__doc__)
    parser.add_argument("--base-seed", type=int, default=DEFAULT_BASE_SEED)
    parser.add_argument("--out", type=Path, default=None,
                        help="output dir relative to the supplement root unless absolute "
                             "(default reproduced_sweep_<UTCdate>_NN); "
                             "must resolve inside the supplement")
    parser.add_argument("--family", action="append", default=None,
                        help="family short key (P1) or dotted name; repeatable; default all")
    parser.add_argument("--dry-run", action="store_true",
                        help="one instance per family + full self-checks; nothing written")
    parser.add_argument("--persist-all", action="store_true",
                        help="dump every site object for the selected families")
    parser.add_argument("--max-per-family", type=int, default=None,
                        help="smoke-run extension: evaluate an evenly strided subset")
    return parser.parse_args(argv)


def resolve_out(args) -> Path:
    if args.out is None:
        date = datetime.now(timezone.utc).strftime("%Y%m%d")
        base = REPO_ROOT / "corpus"
        nn = 1
        while (base / f"reproduced_sweep_{date}_{nn:02d}").exists():
            nn += 1
        out = base / f"reproduced_sweep_{date}_{nn:02d}"
    else:
        out = args.out if args.out.is_absolute() else REPO_ROOT / args.out
    out = out.resolve()
    try:
        out.relative_to(REPO_ROOT.resolve())
    except ValueError:
        raise SystemExit(f"REFUSED: --out {out} resolves outside {REPO_ROOT}")
    return out


def select_families(names):
    if not names:
        return list(families.FAMILIES)
    selected = []
    for name in names:
        if name not in families.FAMILY_BY_KEY:
            raise SystemExit(f"unknown family {name!r}; known: "
                             f"{[f.short for f in families.FAMILIES]}")
        fam = families.FAMILY_BY_KEY[name]
        if fam not in selected:
            selected.append(fam)
    return selected


def make_sidecar(inst, result, base_seed: int, invariant_errors: list) -> dict:
    stages = result["stage_outputs"]
    observed = result["final_route"]
    record = {
        "family": inst.family,
        "instance_index": inst.instance_index,
        "seed": inst.seed,
        "base_seed": base_seed,
        "parameters": inst.params,
        "expected_route": (inst.expected_route_set[0]
                           if len(inst.expected_route_set) == 1 else None),
        "expected_route_set": inst.expected_route_set,
        "observed_route": observed,
        "observed_A": stages["A_capacity_gate"]["label"],
        "observed_B": stages["B_training_candidate_detection"]["labels"],
        "observed_C": stages["C_discrepancy_and_explanation_review"]["labels"],
        "observed_warning_height": stages["final_claim_routing"]["warning_height"],
        "match": observed in inst.expected_route_set,
    }
    if invariant_errors:
        record["invariant_violation"] = True
        record["invariant_errors"] = invariant_errors
    return record


def algorithm_sha256() -> str:
    return hashlib.sha256(ALGORITHM_PATH.read_bytes()).hexdigest()


def chosen_indices(total: int, max_n) -> set:
    if max_n is None or max_n >= total:
        return set(range(total))
    return {int(round(v)) for v in np.linspace(0, total - 1, max_n)}


def run_family(meta, base_seed: int, out_dir, persist_all: bool, max_n) -> dict:
    fam_dir = out_dir / meta.name
    fam_dir.mkdir(parents=True, exist_ok=True)
    (fam_dir / "seed").write_text(f"{base_seed}\n", encoding="utf-8")
    keep = chosen_indices(meta.instances, max_n)
    records, sample_sites, all_sites = [], [], []
    t_gen = t_eval = 0.0
    t0 = time.perf_counter()
    evaluated = 0
    routes_path = fam_dir / "raw_routes.jsonl"
    with routes_path.open("w", encoding="utf-8") as routes:
        gen_start = time.perf_counter()
        for inst in meta.generate(base_seed):
            t_gen += time.perf_counter() - gen_start
            if inst.instance_index in keep:
                schema_errors = selfcheck.schema_gate(inst.site)
                if schema_errors:
                    raise SystemExit("SCHEMA GATE FAILED (generator bug):\n"
                                     + "\n".join(schema_errors))
                consistency = selfcheck.consistency_errors(inst.site)
                if consistency:
                    raise SystemExit("RAW/NORMALIZED CONSISTENCY FAILED (generator bug):\n"
                                     + "\n".join(consistency))
                completeness = selfcheck.coverage_completeness_errors(inst)
                if completeness:
                    raise SystemExit("COVERAGE COMPLETENESS FAILED (generator bug):\n"
                                     + "\n".join(completeness))
                e0 = time.perf_counter()
                result = evaluate_site(inst.site)
                t_eval += time.perf_counter() - e0
                evaluated += 1
                invariant_errors = selfcheck.stage_invariant_gate(inst.site, result)
                record = make_sidecar(inst, result, base_seed, invariant_errors)
                routes.write(json.dumps(record, sort_keys=True) + "\n")
                records.append(record)
                if len(sample_sites) < 20:
                    sample_sites.append(inst.site)
                if persist_all:
                    all_sites.append(inst.site)
            gen_start = time.perf_counter()
    summary = metrics.family_summary(meta, records)
    summary["evaluated_instances"] = evaluated
    summary["designed_instances"] = meta.instances
    (fam_dir / "summary.json").write_text(json.dumps(summary, indent=2, sort_keys=True) + "\n",
                                          encoding="utf-8")
    (fam_dir / "sites_sample.json").write_text(
        json.dumps({"metadata": {"family": meta.name, "base_seed": base_seed,
                                 "sample_size": len(sample_sites)},
                    "sites": sample_sites}, indent=2, sort_keys=True) + "\n",
        encoding="utf-8")
    fam_config = {
        "family": meta.name, "short": meta.short, "group": meta.group,
        "description": meta.description, "param_points": meta.param_points,
        "seeds_per_point": meta.seeds_per_point, "designed_instances": meta.instances,
        "evaluated_instances": evaluated, "base_seed": base_seed,
        "seed_range": {"first_instance_seed": records[0]["seed"] if records else None,
                       "last_instance_seed": records[-1]["seed"] if records else None},
        "headline_metric": meta.headline, "risk_knobs": meta.risk_knobs,
    }
    (fam_dir / "config.json").write_text(json.dumps(fam_config, indent=2, sort_keys=True) + "\n",
                                         encoding="utf-8")
    if persist_all:
        with (fam_dir / "sites_all.jsonl").open("w", encoding="utf-8") as handle:
            for site in all_sites:
                handle.write(json.dumps(site, sort_keys=True) + "\n")
    summary["_timing"] = {"generation_s": t_gen, "evaluation_s": t_eval,
                          "total_s": time.perf_counter() - t0}
    return summary


def dry_run(selected, base_seed: int, anchors_status, probe_status) -> dict:
    report = {"mode": "dry_run", "base_seed": base_seed, "anchors_gate": anchors_status,
              "self_check_probes": {"passed": probe_status["passed"],
                                    "failed": probe_status["failed"]},
              "families": {}}
    ok = probe_status["status"] == "pass"
    for meta in selected:
        inst = next(meta.generate(base_seed))
        errors = (selfcheck.schema_gate(inst.site)
                  + selfcheck.consistency_errors(inst.site)
                  + selfcheck.coverage_completeness_errors(inst))
        result = evaluate_site(inst.site)
        invariants = selfcheck.stage_invariant_gate(inst.site, result)
        det = selfcheck.determinism_check(base_seed, meta)
        entry = {
            "designed_instances": meta.instances,
            "first_instance_seed": inst.seed,
            "observed_route": result["final_route"],
            "expected_route_set": inst.expected_route_set,
            "match": result["final_route"] in inst.expected_route_set,
            "gate_errors": errors,
            "invariant_errors": invariants,
            "deterministic": det["deterministic"],
            "generation_hash": det["hash"],
        }
        if errors or not det["deterministic"]:
            ok = False
        report["families"][meta.name] = entry
    report["total_designed_instances"] = sum(m.instances for m in selected)
    report["status"] = "pass" if ok else "FAIL"
    return report


def main(argv=None) -> None:
    args = parse_args(argv)
    selected = select_families(args.family)

    anchors_status = anchors.run_anchors()  # raises AnchorDriftError on drift
    probe_status = selfcheck.run_probe_suite()
    if probe_status["status"] != "pass" and not args.dry_run:
        raise SystemExit("SELF-CHECK PROBES FAILED; aborting sweep:\n"
                         + "\n".join(probe_status["failures"]))

    if args.dry_run:
        report = dry_run(selected, args.base_seed, anchors_status, probe_status)
        if probe_status["failures"]:
            report["probe_failures"] = probe_status["failures"]
        print(json.dumps(report, indent=2, sort_keys=True))
        if report["status"] != "pass":
            raise SystemExit(1)
        return

    out_dir = resolve_out(args)
    out_dir.mkdir(parents=True, exist_ok=True)
    run_id = out_dir.name
    t_start = time.perf_counter()

    config = {
        "run_id": run_id,
        "base_seed": args.base_seed,
        "rng": RNG_NAME,
        "algorithm_version": ALGORITHM_VERSION,
        "algorithm_source_sha256": algorithm_sha256(),
        "generator_version": GENERATOR_VERSION,
        "families": {meta.name: {"short": meta.short, "param_points": meta.param_points,
                                 "seeds_per_point": meta.seeds_per_point,
                                 "instances": meta.instances,
                                 "description": meta.description}
                     for meta in selected},
        "coverage_profiles": {"good": dict(schema.GOOD_COVERAGE)},
        "thresholds_snapshot": dict(THRESHOLDS),
        "created_utc": datetime.now(timezone.utc).strftime("%Y-%m-%dT%H:%M:%SZ"),
        "total_instances": sum(meta.instances for meta in selected),
        "full_design_total_instances": families.TOTAL_INSTANCES,
        "max_per_family": args.max_per_family,
    }
    (out_dir / "config.json").write_text(json.dumps(config, indent=2, sort_keys=True) + "\n",
                                         encoding="utf-8")

    summaries = []
    for meta in selected:
        summary = run_family(meta, args.base_seed, out_dir, args.persist_all,
                             args.max_per_family)
        timing = summary.pop("_timing")
        print(json.dumps({"family": meta.name,
                          "evaluated": summary["evaluated_instances"],
                          "match_rate": summary["match_rate"]["rate"],
                          "headline": summary["headline"],
                          "invariant_violations": summary["invariant_violations"],
                          "seconds": round(timing["total_s"], 3)}))
        summary["timing"] = timing
        summaries.append(summary)

    total_s = time.perf_counter() - t_start
    evaluated = sum(s["evaluated_instances"] for s in summaries)
    timing = {
        "wall_clock_s": total_s,
        "evaluated_instances": evaluated,
        "seconds_per_instance": total_s / evaluated if evaluated else None,
        "extrapolated_full_sweep_s": (total_s / evaluated * families.TOTAL_INSTANCES
                                      if evaluated else None),
    }
    top = metrics.run_summary(summaries, timing, anchors_status,
                              {"passed": probe_status["passed"],
                               "failed": probe_status["failed"]})
    (out_dir / "run_summary.json").write_text(json.dumps(top, indent=2, sort_keys=True) + "\n",
                                              encoding="utf-8")
    print(json.dumps({"run_id": run_id, "out": str(out_dir),
                      "evaluated_instances": evaluated,
                      "wall_clock_s": round(total_s, 2),
                      "extrapolated_full_sweep_s":
                          round(timing["extrapolated_full_sweep_s"], 2)
                          if timing["extrapolated_full_sweep_s"] else None}))


if __name__ == "__main__":
    main()