#!/usr/bin/env python3
"""Compare L81 and L82 per-tile hashes over each four-strate LOD0-1 view."""
from __future__ import annotations

import json
import re
import subprocess
import time
from pathlib import Path

ROOT = Path(__file__).resolve().parents[4]
OUT = ROOT / "Saved/Linux/l82/hash-check"
DATA = ROOT / "Standalone/data/owner_world.json"
BINARIES = {
    "L81": ROOT / "Saved/Linux/l81/bin/VoxelForgeCoreHeadless-l81-clang",
    "L82": ROOT / "Saved/Linux/l82/bin/VoxelForgeCoreHeadless-clang19",
}
CAMERAS = {
    0: (8.0, 16.0, -372.2626953125),
    1: (25.8369140625, 3.19921875, -737.0),
    2: (19.166015625, -14.2001953125, -753.3740234375),
    3: (-20.0625, -5.068359375, -900.353515625),
}
TILE_HASH = re.compile(
    r"^\[PipelineTileHash\] lod=(-?\d+) x=(-?\d+) y=(-?\d+) z=(-?\d+) "
    r"density=(0x[0-9a-f]+) mesh=(0x[0-9a-f]+) payload=(0x[0-9a-f]+) "
    r"topology=(0x[0-9a-f]+)$", re.M)
WHOLE_HASH = re.compile(
    r"^\[PipelineWholeViewHash\] tiles=(\d+) density=(0x[0-9a-f]+) "
    r"mesh=(0x[0-9a-f]+) payload=(0x[0-9a-f]+) topology=(0x[0-9a-f]+)$", re.M)


def run(strate: int, version: str) -> dict:
    OUT.mkdir(parents=True, exist_ok=True)
    log = OUT / f"{version.lower()}-s{strate}.log"
    camera = ",".join(f"{v:.12f}" for v in CAMERAS[strate]) + ",0,0"
    command = [
        "taskset", "-c", "0-11", "prlimit", "--as=6442450944", "--",
        "env", "VOXELFORGE_L81_PASSAGE_BOUND_PADDING_VOXELS=0", "timeout", "1740s",
        str(BINARIES[version]), str(DATA), "--world-assembler-prototype",
        "--stream-benchmark", "--stream-pipeline", "--workers=8", "--clip-radius=3",
        "--max-clip-level=8", "--max-level=1", f"--camera={camera}",
        "--stream-hash-tiles",
    ]
    start = time.monotonic()
    with log.open("w", encoding="utf-8") as stream:
        result = subprocess.run(command, cwd=ROOT, stdout=stream,
                                stderr=subprocess.STDOUT, check=False, timeout=1740)
    output = log.read_text(encoding="utf-8", errors="replace")
    hashes = {
        (int(m.group(1)), int(m.group(2)), int(m.group(3)), int(m.group(4))): m.group(5, 6, 7, 8)
        for m in TILE_HASH.finditer(output)
    }
    whole = WHOLE_HASH.search(output)
    if result.returncode or whole is None or len(hashes) != 960:
        raise RuntimeError(f"hash run failed or incomplete: exit={result.returncode} {log}")
    row = {
        "version": version, "strate": strate, "exit_code": result.returncode,
        "wall_s": round(time.monotonic() - start, 3), "tile_hash_count": len(hashes),
        "whole_hash": whole.group(1, 2, 3, 4, 5), "hashes": hashes,
        "log": str(log.relative_to(ROOT)),
    }
    print("[L82HashRun] " + json.dumps(
        {k: v for k, v in row.items() if k != "hashes"}, sort_keys=True), flush=True)
    return row


def main() -> int:
    for binary in (*BINARIES.values(), DATA):
        if not binary.is_file():
            raise SystemExit(f"missing input: {binary}")
    rows = []
    comparisons = []
    for strate in range(4):
        pair = {version: run(strate, version) for version in ("L81", "L82")}
        a, b = pair["L81"], pair["L82"]
        mismatch_keys = sorted(key for key in set(a["hashes"]) | set(b["hashes"])
                               if a["hashes"].get(key) != b["hashes"].get(key))
        comparison = {
            "strate": strate, "tiles": len(a["hashes"]),
            "tile_hashes_identical": not mismatch_keys,
            "whole_hash_identical": a["whole_hash"] == b["whole_hash"],
            "mismatch_count": len(mismatch_keys),
            "first_mismatches": mismatch_keys[:8],
            "l81_whole_hash": a["whole_hash"], "l82_whole_hash": b["whole_hash"],
        }
        comparisons.append(comparison)
        rows.extend({k: v for k, v in run_data.items() if k != "hashes"}
                    for run_data in pair.values())
        print("[L82HashComparison] " + json.dumps(comparison, sort_keys=True), flush=True)
    summary = {"comparisons": comparisons, "runs": rows}
    (OUT / "summary.json").write_text(json.dumps(summary, indent=2) + "\n",
                                      encoding="utf-8")
    return 0 if all(item["tile_hashes_identical"] and item["whole_hash_identical"]
                    for item in comparisons) else 1


if __name__ == "__main__":
    raise SystemExit(main())