#!/usr/bin/env python3
"""Build the 3-strata composed Core.Liminal.Field v2 fixture."""
from __future__ import annotations

import argparse
import json
import os
from pathlib import Path


ROOT = Path(__file__).resolve().parents[4]
OWNER = Path(os.environ.get("VOXELFORGE_OWNER_DATA",
                            ROOT / "Standalone/data/owner_world.json"))
OUT_DEFAULT = Path(os.environ.get("VOXELFORGE_VERIFY_OUT", ROOT / "Saved/Linux/l145"))


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--out", type=Path, default=OUT_DEFAULT / "fixtures")
    args = parser.parse_args()
    args.out.mkdir(parents=True, exist_ok=True)
    world = json.loads(OWNER.read_text(encoding="utf-8"))
    if len(world.get("strates", [])) < 3:
        raise SystemExit("owner fixture needs at least three authored strate slots")

    world["strates"] = world["strates"][:3]
    world["total_strates"] = 3
    world["settings_asset"]["TotalStrates"] = 3
    world["settings_asset"]["FixedStrates"] = world["settings_asset"]["FixedStrates"][:3]
    # Keep the resolved arrival near the departure depth. The owner's 5000-unit
    # reach clamps to liminal bedrock on most seeds and leaves no field floor.
    world["strates"][0]["passage_config"]["ReachMin"] = 1536
    world["strates"][0]["passage_config"]["ReachMax"] = 1792
    world["surface_profile_override"] = {
        "version": 1,
        "kind": "flatField",
        "minimum_arena_clearance_m": 0.0,
    }
    middle = world["strates"][1]
    middle["asset"]["GeneratorType"] = 4  # ECaveGeneratorType::SurfaceWorld
    middle["asset"]["StrateName"] = "Liminal Field"
    # Keep the departure mouth 24–32 m above liminal bedrock so every variant
    # has room for its floor, road landing and support footings.
    middle["passage_config"]["ReachMin"] = 192
    middle["passage_config"]["ReachMax"] = 256
    world["core_liminal_field"] = {
        "version": 2,
        "strate_index": int(middle["index"]),
        "variant_policy": "seed_modulo_4",
    }

    output = args.out / "core-liminal-field-3-strata.json"
    output.write_text(json.dumps(world, separators=(",", ":")) + "\n", encoding="utf-8")
    print(f"[L145Fixture] path={output} strates=SurfaceWorld,Core.Liminal.Field,TunnelNetwork status=PASS")


if __name__ == "__main__":
    main()