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#!/usr/bin/env python3
from __future__ import annotations

import argparse
import json
import os
import shutil
import subprocess
import time
from pathlib import Path


ROOT = Path(__file__).resolve().parents[1]
DEFAULT_EVALS = ROOT / "data" / "opencode_tool_calling_eval.jsonl"
DEFAULT_CONFIG = ROOT / "configs" / "opencode-qwen35.json"
WORK_ROOT = ROOT / "tmp" / "opencode-eval"


def iter_jsonl(path: Path):
    with path.open() as f:
        for line in f:
            if line.strip():
                yield json.loads(line)


def seed_workspace(case: dict, workdir: Path) -> None:
    if workdir.exists():
        shutil.rmtree(workdir)
    workdir.mkdir(parents=True)
    for rel, text in case["files"].items():
        path = workdir / rel
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_text(text)


def apply_expected_outputs(case: dict, workdir: Path) -> None:
    for rel, text in (case.get("verify") or {}).items():
        path = workdir / rel
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_text(text)
    for rel, needles in (case.get("verify_contains") or {}).items():
        path = workdir / rel
        path.parent.mkdir(parents=True, exist_ok=True)
        path.write_text("\n".join(needles) + "\n")
    for rel in case.get("verify_missing") or []:
        path = workdir / rel
        if path.exists():
            path.unlink()


def verify_case(case: dict, workdir: Path) -> list[str]:
    errors: list[str] = []
    for rel, expected in (case.get("verify") or {}).items():
        path = workdir / rel
        if not path.exists():
            errors.append(f"{rel} is missing")
        elif path.read_text() != expected:
            errors.append(f"{rel} did not match expected content")
    for rel, needles in (case.get("verify_contains") or {}).items():
        path = workdir / rel
        if not path.exists():
            errors.append(f"{rel} is missing")
            continue
        text = path.read_text().lower()
        for needle in needles:
            if needle.lower() not in text:
                errors.append(f"{rel} does not contain {needle!r}")
    for rel in case.get("verify_missing") or []:
        if (workdir / rel).exists():
            errors.append(f"{rel} still exists")
    command = case.get("verify_command")
    if command:
        proc = subprocess.run(command, cwd=workdir, text=True, capture_output=True, timeout=120)
        if proc.returncode != 0:
            errors.append(f"verify_command failed: {proc.stdout}{proc.stderr}")
    return errors


def parse_tool_mentions(text: str, expected_tools: list[str]) -> list[str]:
    found: list[str] = []
    lower = text.lower()
    for name in expected_tools:
        if name.lower() in lower:
            found.append(name)
    return found


def self_check_case(case: dict) -> dict:
    workdir = WORK_ROOT / f"self-check-{case['id']}"
    seed_workspace(case, workdir)
    apply_expected_outputs(case, workdir)
    errors = verify_case(case, workdir)
    return {"id": case["id"], "passed": not errors, "verify_errors": errors}


def run_case(case: dict, args: argparse.Namespace) -> dict:
    workdir = WORK_ROOT / case["id"]
    seed_workspace(case, workdir)
    config_content = args.config.read_text()
    command = [
        "bunx",
        "opencode-ai@latest",
        "run",
        "--model",
        args.model,
        "--format",
        "json",
        "--dir",
        str(workdir),
    ]
    if args.dangerously_skip_permissions:
        command.append("--dangerously-skip-permissions")
    command.append(case["prompt"])
    env = os.environ.copy()
    env["OPENCODE_CONFIG_CONTENT"] = config_content
    env.setdefault("OPENAI_API_KEY", "omlx")

    start = time.time()
    proc = subprocess.run(command, cwd=workdir, text=True, capture_output=True, timeout=args.timeout, env=env)
    verify_errors = verify_case(case, workdir) if proc.returncode == 0 else ["opencode exited nonzero"]
    combined = f"{proc.stdout}\n{proc.stderr}"
    return {
        "id": case["id"],
        "returncode": proc.returncode,
        "seconds": round(time.time() - start, 3),
        "passed": proc.returncode == 0 and not verify_errors,
        "verify_errors": verify_errors,
        "expected_tools": case.get("expected_tools") or [],
        "observed_tool_mentions": parse_tool_mentions(combined, case.get("expected_tools") or []),
        "stdout_tail": proc.stdout[-4000:],
        "stderr_tail": proc.stderr[-4000:],
    }


def main() -> int:
    parser = argparse.ArgumentParser()
    parser.add_argument("--evals", type=Path, default=DEFAULT_EVALS)
    parser.add_argument("--config", type=Path, default=DEFAULT_CONFIG)
    parser.add_argument("--model", default="qwen35/qwen35")
    parser.add_argument("--timeout", type=int, default=300)
    parser.add_argument("--limit", type=int)
    parser.add_argument("--self-check", action="store_true", help="Verify eval seed/check logic without invoking opencode.")
    parser.add_argument("--dangerously-skip-permissions", action="store_true", help="Pass opencode's non-interactive permission bypass flag for disposable eval workspaces.")
    args = parser.parse_args()

    WORK_ROOT.mkdir(parents=True, exist_ok=True)
    cases = list(iter_jsonl(args.evals))
    if args.limit is not None:
        cases = cases[: args.limit]

    results = []
    for case in cases:
        if args.self_check:
            result = self_check_case(case)
        else:
            print(f"running {case['id']}")
            try:
                result = run_case(case, args)
            except subprocess.TimeoutExpired as exc:
                result = {
                    "id": case["id"],
                    "returncode": None,
                    "seconds": args.timeout,
                    "passed": False,
                    "verify_errors": ["opencode timed out"],
                    "expected_tools": case.get("expected_tools") or [],
                    "observed_tool_mentions": [],
                    "stdout_tail": (exc.stdout or "")[-4000:],
                    "stderr_tail": (exc.stderr or "")[-4000:],
                }
        print(json.dumps(result, indent=2))
        results.append(result)

    out = ROOT / "tmp" / "opencode-eval-results.json"
    out.write_text(json.dumps(results, indent=2) + "\n")
    failed = [row for row in results if not row["passed"]]
    print(f"passed {len(results) - len(failed)}/{len(results)}")
    return 1 if failed else 0


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