#!/usr/bin/env python3
"""gen_hook_placement_truth.py — factory batch 4 truth battery
(contract BUILDER-2026-10-07T23:06:18Z-ec6208).

The LIVE recommend_placement oracle over a factor matrix covering every
branch: hook-point combos, frequency ladder, cache scopes, concurrency,
failure modes, context budget.

Usage: python3 scripts/gen_hook_placement_truth.py   (from repo root)
"""

import json
import sys
from pathlib import Path

REPO = Path(__file__).resolve().parent.parent
sys.path.insert(0, str(REPO / "src"))
sys.path.insert(0, str(REPO / "src" / "rune"))

import hook_engine as he  # noqa: E402


def main():
    factor_sets = [
        {"output_dep": True},
        {"input_dep": True},
        {"input_dep": True, "output_dep": True},
        {},
        {"side_effects": "read-write"},
        {"volatility": "session"},
        {"volatility": "per-turn"},
        {"scope": "persistent"},
        {"scope": "session"},
        {"concurrent": True},
        {"failure": "fail-loud"},
        {"context_budget": 500},
        {"input_dep": True, "scope": "session", "concurrent": True,
         "context_budget": 250},
        {"side_effects": "read-write", "failure": "fail-loud",
         "scope": "persistent"},
    ]
    cases = []
    for i, factors in enumerate(factor_sets):
        cases.append({
            "fn": "placement", "name": f"matrix_{i}",
            "input": {"factors": factors},
            "expected": he.recommend_placement(f"hook_{i}", factors),
        })

    out = {
        "oracle": "src/rune/hook_engine.py recommend_placement (live)",
        "generated": "2026-10-07",
        "cases": cases,
    }
    target = REPO / "src/go/hook-engine" / "truth_placement.json"
    target.write_text(json.dumps(out, indent=1, ensure_ascii=False) + "\n")
    print(f"wrote {target} ({len(cases)} cases)")


if __name__ == "__main__":
    main()