"""Reproducible bounded export measurements against production entry points.

Run from backend with PYTHONPATH=packages/harness:packages/extension-api:.:
    python scripts/benchmark/skill_export.py
Each workload uses a fresh process; RSS is that process's peak, including imports.
No scripts, network, models, or security scanners are invoked by this benchmark.
"""

from __future__ import annotations

import json
import os
import shutil
import subprocess
import sys
import tempfile
import threading
import time
from pathlib import Path

try:
    import resource
except ImportError:  # pragma: no cover - Windows only
    resource = None  # type: ignore[assignment]

from deerflow.skills import export
from deerflow.skills.storage.local_skill_storage import LocalSkillStorage


class Tracker:
    def __init__(self):
        self.files = []
        self.peak_count = 0
        self.peak_bytes = 0
        self.original = tempfile.TemporaryFile

    def sample(self):
        active = [file for file in self.files if not file.closed]
        self.peak_count = max(self.peak_count, len(active))
        self.peak_bytes = max(self.peak_bytes, sum(file.high_water for file in active))

    def create(self, *args, **kwargs):
        tracker = self

        class Tracked:
            def __init__(self, raw):
                self.raw = raw
                self.high_water = 0

            def write(self, data):
                written = self.raw.write(data)
                self.high_water = max(self.high_water, self.raw.tell())
                tracker.sample()
                return written

            def __getattr__(self, name):
                return getattr(self.raw, name)

            def __enter__(self):
                return self

            def __exit__(self, *args):
                self.raw.close()

        file = Tracked(self.original(*args, **kwargs))
        self.files.append(file)
        self.sample()
        return file


def run(case):
    with tempfile.TemporaryDirectory(prefix="skill-export-benchmark-") as workspace:
        storage = LocalSkillStorage(host_path=workspace)
        name = "skill-creator" if case == "public" else "benchmark"
        root = storage.get_custom_skill_dir(name)
        if case == "public":
            public = Path(__file__).resolve().parents[3] / "skills/public/skill-creator"
            shutil.copytree(public, root, ignore=shutil.ignore_patterns("__pycache__"))
        else:
            root.mkdir(parents=True)
            (root / "SKILL.md").write_text("---\nname: benchmark\ndescription: Export benchmark\n---\n", encoding="utf-8")
            if case in ("large", "cancel"):
                # Incompressible bytes exercise ZIP disk limits realistically.
                with (root / "asset.bin").open("wb") as file:
                    for _ in range(64):
                        file.write(os.urandom(1024 * 1024))
            elif case == "entries":
                for index in range(4094):
                    (root / f"asset-{index:04}").touch()
        tracker = Tracker()
        export.tempfile.TemporaryFile = tracker.create
        start = time.perf_counter()
        manifest_seconds = None
        archive_bytes = None
        outcome = "ok"
        try:
            if case == "cancel":
                event = threading.Event()
                timer = threading.Timer(0.02, event.set)
                timer.start()
                try:
                    export.export_manifest(storage, name, event)
                except export.SkillExportError as error:
                    outcome = error.code
                finally:
                    timer.cancel()
                    timer.join()
            else:
                manifest = export.export_manifest(storage, name)
                manifest_seconds = time.perf_counter() - start
                archive = export.build_skill_export(storage, name, manifest["revision"])
                try:
                    archive_bytes = archive.size
                finally:
                    archive.close()
            elapsed = time.perf_counter() - start
        finally:
            export.tempfile.TemporaryFile = tracker.original
        rss = resource.getrusage(resource.RUSAGE_SELF).ru_maxrss if resource is not None else None
        print(
            json.dumps(
                {
                    "case": case,
                    "outcome": outcome,
                    "wall_seconds": round(elapsed, 4),
                    "manifest_seconds": round(manifest_seconds, 4) if manifest_seconds is not None else None,
                    "peak_rss_bytes": (rss if sys.platform == "darwin" else rss * 1024) if rss is not None else None,
                    "peak_temp_files": tracker.peak_count,
                    "peak_temp_bytes": tracker.peak_bytes,
                    "remaining_temp_files": sum(not file.closed for file in tracker.files),
                    "archive_bytes": archive_bytes,
                }
            )
        )


if __name__ == "__main__":
    if len(sys.argv) > 1:
        run(sys.argv[1])
    else:
        for case in ("public", "large", "entries", "cancel"):
            subprocess.run([sys.executable, __file__, case], check=True)