from __future__ import annotations

import csv
import gzip
import json
import os
import re
import shutil
import tarfile
import urllib.request
from concurrent.futures import ThreadPoolExecutor, as_completed
from dataclasses import asdict, dataclass
from pathlib import Path
from statistics import median
from typing import Iterable

from .metrics import enrichment_rows, validation_metrics_from_rows
from .provenance import (
    CommandRecord,
    CommandRunner,
    RDockPipelineError,
    fail_if_bad_command,
    require_executable,
    require_file,
    resolve_dock_prm_path,
    resolve_rbt_root,
)
from .reports.plots import plot_astex_outputs, plot_dud_outputs
from .sdf import best_per_ligand, parse_rdock_sdf_records, records_to_rows, split_sdf_file, write_rows_csv, write_sdf_blocks, write_sdf_records

VALIDATION_URL = "https://rdock.github.io/validation-sets/"


@dataclass(frozen=True)
class ValidationSystem:
    system_id: str
    path: str
    receptor_prm: str
    dock_prm: str
    ligand_sdf: str = ""
    ligprep_sdf: str = ""
    crystal_sdf: str = ""


def resolve_jobs(jobs: int | str = "auto", cpu_fraction: float = 0.85) -> int:
    if str(jobs).lower() == "auto":
        cpus = os.cpu_count() or 1
        reserve = 1 if cpus <= 4 else 2
        return max(1, min(cpus - reserve, int(cpus * float(cpu_fraction))))
    return max(1, int(jobs))


def _rdock_env() -> dict[str, str]:
    root = resolve_rbt_root(executable="rbdock")
    if root:
        return {"RBT_ROOT": root, "RBT_HOME": root}
    return {}


def _system_id_from_prm(path: Path) -> str:
    name = path.stem
    return re.sub(r"_?rdock$", "", name, flags=re.IGNORECASE)


def _find_first(candidates: Iterable[Path]) -> Path | None:
    for p in candidates:
        if p.exists() and p.is_file() and p.stat().st_size > 0:
            return p
    return None


def _find_dock_prm(system_dir: Path) -> Path | None:
    candidates = [system_dir / "dock.prm"] + [parent / "dock.prm" for parent in list(system_dir.parents)[:3]]
    resolved = resolve_dock_prm_path(executable="rbdock")
    if resolved is not None:
        candidates.append(resolved)
    return _find_first(candidates)


def discover_validation_systems(data_dir: str | Path, set_name: str) -> list[ValidationSystem]:
    root = Path(data_dir)
    if not root.exists():
        return []
    systems: dict[str, ValidationSystem] = {}
    for prm in sorted(root.rglob("*_rdock.prm")):
        system_dir = prm.parent
        system_id = _system_id_from_prm(prm)
        dock_prm = _find_dock_prm(system_dir)
        if dock_prm is None:
            local = list(system_dir.rglob("dock.prm"))
            dock_prm = local[0] if local else None
        sdf_files = sorted(list(system_dir.glob("*.sd")) + list(system_dir.glob("*.sdf")))
        gz_sdfs = sorted(list(system_dir.glob("*.sd.gz")) + list(system_dir.glob("*.sdf.gz")))
        ligand_sdf = _find_first(
            [
                system_dir / f"{system_id}_ligand.sd",
                system_dir / f"{system_id}_ligand.sdf",
                system_dir / "ligand.sd",
                system_dir / "ligand.sdf",
            ]
            + [p for p in sdf_files if "ligand" in p.name.lower() or "crystal" in p.name.lower()]
            + sdf_files
        )
        ligprep_sdf = _find_first(
            [
                system_dir / f"{system_id}_ligprep.sdf",
                system_dir / f"{system_id}_ligprep.sd",
            ]
            + [p for p in sdf_files if "ligprep" in p.name.lower()]
            + [p for p in gz_sdfs if "ligprep" in p.name.lower()]
        )
        if set_name.lower() == "dud" and ligprep_sdf is None:
            continue
        systems[system_id] = ValidationSystem(
            system_id=system_id,
            path=str(system_dir),
            receptor_prm=str(prm),
            dock_prm=str(dock_prm or ""),
            ligand_sdf=str(ligand_sdf or ""),
            ligprep_sdf=str(ligprep_sdf or ""),
            crystal_sdf=str(ligand_sdf or ""),
        )
    return [systems[k] for k in sorted(systems)]


def _actionable_missing_system(data_dir: Path, set_name: str, system: str | None) -> RDockPipelineError:
    expected = data_dir / (system or "<system>")
    return RDockPipelineError(
        "Missing rDock validation data.\n"
        f"Expected path or discoverable system files under: {expected}\n"
        f"Validation set: {set_name}\n"
        f"Official validation sets: {VALIDATION_URL}\n"
        "Use one of:\n"
        f"  python -m docking_pipeline validate-rdock --set {set_name} --data-dir {data_dir} --list-systems\n"
        f"  python -m docking_pipeline validate-rdock --set {set_name} --system {system or '<id>'} --data-dir {data_dir} --out results/benchmarks/{set_name}_{system or '<id>'} --download-url <official_tar.gz> --download-if-missing\n"
        "or manually download/extract the official rDock validation set and pass its extracted directory via --data-dir."
    )


def download_validation_set(download_url: str, data_dir: str | Path, force: bool = False) -> Path:
    target = Path(data_dir)
    if target.exists() and any(target.iterdir()) and not force:
        return target
    target.mkdir(parents=True, exist_ok=True)
    archive = target / Path(download_url).name
    urllib.request.urlretrieve(download_url, archive)
    with tarfile.open(archive, "r:*") as tar:
        tar.extractall(target)
    return target


def ensure_validation_data(data_dir: str | Path, set_name: str, download_url: str | None, download_if_missing: bool, force: bool = False) -> Path:
    root = Path(data_dir)
    if root.exists() and discover_validation_systems(root, set_name):
        return root
    if download_if_missing:
        if not download_url:
            raise RDockPipelineError(
                f"--download-if-missing was set but --download-url was not provided. Official validation sets: {VALIDATION_URL}"
            )
        download_validation_set(download_url, root, force=force)
    return root


def resolve_systems(
    data_dir: str | Path,
    set_name: str,
    system: str | None = None,
    system_list: str | Path | None = None,
    max_systems: int | None = None,
) -> list[ValidationSystem]:
    root = Path(data_dir)
    systems = discover_validation_systems(root, set_name)
    if not systems:
        raise _actionable_missing_system(root, set_name, system)
    wanted: set[str] | None = None
    if system:
        wanted = {system}
    if system_list:
        ids = [line.strip() for line in Path(system_list).read_text(encoding="utf-8").splitlines() if line.strip()]
        wanted = (wanted or set()) | set(ids)
    if wanted is not None:
        systems = [s for s in systems if s.system_id in wanted]
        if not systems:
            raise _actionable_missing_system(root, set_name, system or ",".join(sorted(wanted)))
    if max_systems is not None:
        systems = systems[: int(max_systems)]
    return systems


def _copy_system(src: Path, out_dir: Path, force: bool) -> Path:
    dst = out_dir / "rdock" / src.name
    if dst.exists():
        if not force:
            return dst
        shutil.rmtree(dst)
    shutil.copytree(src, dst)
    return dst


def _gunzip_if_needed(path: Path) -> Path:
    if path.exists() and path.suffix != ".gz":
        return path
    if path.suffix == ".gz":
        out = path.with_suffix("")
        if not out.exists():
            with gzip.open(path, "rb") as src, out.open("wb") as dst:
                shutil.copyfileobj(src, dst)
        return out
    gz = path.with_suffix(path.suffix + ".gz")
    if gz.exists():
        return _gunzip_if_needed(gz)
    return require_file(path, "ligand-prepped SDF")


def _run_rbdock_parallel(
    runner: CommandRunner,
    work: Path,
    prm: Path,
    dock_prm: Path,
    ligand_sdf: Path,
    out_prefix: str,
    n_runs: int,
    jobs: int,
) -> tuple[Path, list[CommandRecord]]:
    rbdock = require_executable("rbdock")
    blocks = split_sdf_file(ligand_sdf)
    chunk_dir = work / "chunks"
    chunk_dir.mkdir(exist_ok=True)
    chunk_count = min(max(1, jobs), len(blocks))
    chunks: list[Path] = []
    for idx in range(chunk_count):
        chunk_blocks = blocks[idx::chunk_count]
        chunk = chunk_dir / f"chunk_{idx:03d}.sdf"
        write_sdf_blocks(chunk_blocks, chunk)
        chunks.append(chunk)

    def run_one(idx: int, chunk: Path) -> tuple[int, CommandRecord, Path]:
        prefix = work / f"{out_prefix}_chunk_{idx:03d}"
        rec = runner.run(
            f"rbdock_chunk_{idx:03d}",
            [rbdock, "-r", str(prm.name), "-p", str(dock_prm), "-n", str(int(n_runs)), "-i", str(chunk.relative_to(work)), "-o", str(prefix.name)],
            work,
            work / f"{out_prefix}_chunk_{idx:03d}.stdout.log",
            work / f"{out_prefix}_chunk_{idx:03d}.stderr.log",
            env=_rdock_env(),
        )
        return idx, rec, prefix.with_suffix(".sd")

    outputs: dict[int, Path] = {}
    records: list[CommandRecord] = []
    with ThreadPoolExecutor(max_workers=chunk_count) as pool:
        futures = [pool.submit(run_one, idx, chunk) for idx, chunk in enumerate(chunks)]
        for fut in as_completed(futures):
            idx, rec, out_sd = fut.result()
            fail_if_bad_command(rec, f"rbdock chunk {idx}")
            require_file(out_sd, f"rDock output chunk {idx}")
            outputs[idx] = out_sd
            records.append(rec)
    merged = work / f"{out_prefix}.sd"
    all_blocks: list[str] = []
    for idx in sorted(outputs):
        all_blocks.extend(split_sdf_file(outputs[idx]))
    write_sdf_blocks(all_blocks, merged)
    return merged, records


def _parse_rmsd_stdout(text: str) -> list[float]:
    vals: list[float] = []
    for token in re.findall(r"[-+]?(?:\d+\.\d+|\d+)", text):
        try:
            value = float(token)
        except Exception:
            continue
        if 0.0 <= value < 100.0:
            vals.append(value)
    return vals


def _sdf_pose_coords(path: Path) -> list[list[list[float]]]:
    poses: list[list[list[float]]] = []
    for block in split_sdf_file(path):
        lines = block.splitlines()
        if len(lines) < 4:
            continue
        try:
            atom_count = int(lines[3][0:3])
        except Exception:
            continue
        coords: list[list[float]] = []
        for line in lines[4 : 4 + atom_count]:
            try:
                coords.append([float(line[0:10]), float(line[10:20]), float(line[20:30])])
            except Exception:
                parts = line.split()
                if len(parts) >= 3:
                    try:
                        coords.append([float(parts[0]), float(parts[1]), float(parts[2])])
                    except Exception:
                        continue
        if coords:
            poses.append(coords)
    return poses


def _rmsd_same_order(a: list[list[float]], b: list[list[float]]) -> float:
    n = min(len(a), len(b))
    if n == 0:
        return float("nan")
    return (sum((a[i][0] - b[i][0]) ** 2 + (a[i][1] - b[i][1]) ** 2 + (a[i][2] - b[i][2]) ** 2 for i in range(n)) / n) ** 0.5


def _internal_rmsds(reference_sdf: Path, poses_sdf: Path) -> list[float]:
    ref = _sdf_pose_coords(reference_sdf)
    poses = _sdf_pose_coords(poses_sdf)
    if not ref:
        return []
    return [_rmsd_same_order(ref[0], pose) for pose in poses]


def _write_csv(path: Path, rows: list[dict[str, object]]) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    fields: list[str] = []
    for row in rows:
        for k in row:
            if k not in fields:
                fields.append(k)
    with path.open("w", encoding="utf-8", newline="") as handle:
        writer = csv.DictWriter(handle, fieldnames=fields)
        writer.writeheader()
        writer.writerows(rows)


def _empty_standard_outputs(root: Path) -> None:
    for name in ("target", "ligands", "rdock", "poses", "tables", "metrics", "plots"):
        (root / name).mkdir(parents=True, exist_ok=True)


def _copy_receptor_to_target(work: Path, system: ValidationSystem, root: Path) -> Path | None:
    target_dir = root / "target"
    target_dir.mkdir(parents=True, exist_ok=True)
    prm_stem = Path(system.receptor_prm).stem
    candidates = [
        work / f"{prm_stem}.mol2",
        work / f"{system.system_id}_rdock.mol2",
        work / f"{system.system_id}.mol2",
    ]
    candidates.extend(sorted(work.glob("*.mol2")))
    receptor = _find_first(candidates)
    if receptor is None:
        return None
    dst = target_dir / receptor.name
    shutil.copy2(receptor, dst)
    return dst


def validate_astex_system(
    system: ValidationSystem,
    root: Path,
    n_runs: int,
    jobs: int,
    force: bool = False,
) -> dict[str, object]:
    _empty_standard_outputs(root)
    work = _copy_system(Path(system.path), root, force=force)
    _copy_receptor_to_target(work, system, root)
    runner = CommandRunner(root / "commands.log")
    for exe in ("rbcavity", "rbdock", "sdsort", "sdrmsd"):
        require_executable(exe)
    prm = require_file(work / Path(system.receptor_prm).name, "ASTEX rDock receptor prm")
    dock_prm = require_file(system.dock_prm, "ASTEX dock.prm")
    ligand = require_file(work / Path(system.ligand_sdf).name, "ASTEX ligand SDF")
    rec = runner.run("rbcavity", ["rbcavity", "-r", prm.name, "-was"], work, work / "rbcavity.stdout.log", work / "rbcavity.stderr.log", env=_rdock_env())
    fail_if_bad_command(rec, "ASTEX rbcavity")
    out_sd, _ = _run_rbdock_parallel(runner, work, prm, dock_prm, ligand, f"{system.system_id}_docking_out", n_runs, jobs)
    rec = runner.run(
        "sdsort",
        ["/bin/sh", "-c", f"sdsort -n -f'SCORE' {out_sd.name} > {system.system_id}_docking_out_sorted.sd"],
        work,
        work / "sdsort.stdout.log",
        work / "sdsort.stderr.log",
        env=_rdock_env(),
    )
    fail_if_bad_command(rec, "ASTEX sdsort")
    sorted_sd = require_file(work / f"{system.system_id}_docking_out_sorted.sd", "ASTEX sorted SDF")
    rmsd_source = "sdrmsd"
    rmsd_diagnostic = ""
    rec = runner.run("sdrmsd", ["sdrmsd", ligand.name, sorted_sd.name], work, work / "sdrmsd.stdout.log", work / "sdrmsd.stderr.log", env=_rdock_env())
    try:
        fail_if_bad_command(rec, "ASTEX sdrmsd")
        rmsds = _parse_rmsd_stdout(Path(rec.stdout_log).read_text(encoding="utf-8", errors="ignore"))
    except RDockPipelineError as exc:
        rmsd_source = "internal_same_atom_order_sdf_rmsd_after_sdrmsd_failure"
        rmsd_diagnostic = str(exc)
        rmsds = _internal_rmsds(ligand, sorted_sd)
    top1 = rmsds[0] if rmsds else float("nan")
    best = min(rmsds) if rmsds else float("nan")
    shutil.copy2(out_sd, root / "poses" / "all_poses.sdf")
    shutil.copy2(sorted_sd, root / "poses" / "best_per_ligand.sdf")
    records = parse_rdock_sdf_records(out_sd)
    sorted_records = parse_rdock_sdf_records(sorted_sd)
    best_records = best_per_ligand(records)
    write_rows_csv(records_to_rows(records), root / "tables" / "scores_long.csv")
    write_rows_csv(records_to_rows(best_records), root / "tables" / "best_per_ligand.csv")
    top1_score = sorted_records[0].numeric_tags.get("SCORE") if sorted_records else None
    row = {
        "system_id": system.system_id,
        "top1_rmsd": top1,
        "best_of_n_rmsd": best,
        "top1_SCORE": top1_score,
        "success_top1_rmsd_le_2A": bool(top1 <= 2.0),
        "success_best_rmsd_le_2A": bool(best <= 2.0),
        "n_poses": len(records),
        "status": "success",
        "rmsd_source": rmsd_source,
        "rmsd_diagnostic": rmsd_diagnostic,
    }
    _write_csv(root / "tables" / "astex_system_summary.csv", [row])
    metrics = {
        **row,
        "median_top1_rmsd": top1,
        "median_best_rmsd": best,
        "n_systems_total": 1,
        "n_systems_successful": 1,
        "n_systems_failed": 0,
        "n_poses_total": len(records),
    }
    (root / "metrics" / "validation_metrics.json").write_text(json.dumps(metrics, indent=2), encoding="utf-8")
    (root / "metrics" / "enrichment.csv").write_text("", encoding="utf-8")
    plots = plot_astex_outputs(root / "tables" / "astex_system_summary.csv", root / "plots")
    _write_validation_report(root, "ASTEX", [system], runner.records, metrics, plots)
    return metrics


def _read_dud_labels(work: Path) -> dict[str, int]:
    labels: dict[str, int] = {}
    for name, value in (("ligands.txt", 1), ("actives.txt", 1), ("decoys.txt", 0)):
        p = work / name
        if not p.exists():
            continue
        for line in p.read_text(encoding="utf-8", errors="ignore").splitlines():
            parts = line.strip().split()
            if parts:
                labels[parts[0]] = value
    return labels


def validate_dud_system(system: ValidationSystem, root: Path, n_runs: int, jobs: int, force: bool = False) -> dict[str, object]:
    _empty_standard_outputs(root)
    work = _copy_system(Path(system.path), root, force=force)
    _copy_receptor_to_target(work, system, root)
    runner = CommandRunner(root / "commands.log")
    for exe in ("rbcavity", "rbdock", "sdsort", "sdfilter", "sdreport"):
        require_executable(exe)
    prm = require_file(work / Path(system.receptor_prm).name, "DUD rDock receptor prm")
    dock_prm = require_file(system.dock_prm, "DUD dock.prm")
    ligprep = _gunzip_if_needed(work / Path(system.ligprep_sdf).name)
    labels = _read_dud_labels(work)
    if not labels:
        raise RDockPipelineError(
            "Missing DUD active/decoy label files for enrichment metrics.\n"
            f"Expected `ligands.txt`/`actives.txt` and `decoys.txt` in: {work}\n"
            "The official rDock ROC workflow requires these files to assign IsActive labels.\n"
            "Add the label files for this DUD system, then rerun the same validate-rdock command."
        )
    rec = runner.run("rbcavity", ["rbcavity", "-r", prm.name, "-was"], work, work / "rbcavity.stdout.log", work / "rbcavity.stderr.log", env=_rdock_env())
    fail_if_bad_command(rec, "DUD rbcavity")
    out_sd, _ = _run_rbdock_parallel(runner, work, prm, dock_prm, ligprep, f"{system.system_id}_docking_out", n_runs, jobs)
    records = parse_rdock_sdf_records(out_sd, require_score=True)
    best_records = best_per_ligand(records)
    best_sd = write_sdf_records(best_records, work / f"{system.system_id}_1poseperlig.sd")
    rows = records_to_rows(best_records)
    for row in rows:
        row["label"] = labels.get(str(row["ligand_id"]), 0)
    duplicate_count = len(records) - len({r.ligand_id for r in records})
    metrics = validation_metrics_from_rows(rows)
    metrics.update(
        {
            "active_count": sum(int(row.get("label", 0)) for row in rows),
            "decoy_count": sum(1 - int(row.get("label", 0)) for row in rows),
            "attempted_ligands": len(split_sdf_file(ligprep)),
            "successful_ligands": len(rows),
            "failed_ligands": max(0, len(split_sdf_file(ligprep)) - len(rows)),
            "duplicate_ligand_ids": duplicate_count,
            "missing_SCORE_count": 0,
        }
    )
    shutil.copy2(out_sd, root / "poses" / "all_poses.sdf")
    shutil.copy2(best_sd, root / "poses" / "best_per_ligand.sdf")
    write_rows_csv(records_to_rows(records), root / "tables" / "scores_long.csv")
    write_rows_csv(rows, root / "tables" / "best_per_ligand.csv")
    _write_csv(root / "metrics" / "enrichment.csv", enrichment_rows([float(r["SCORE"]) for r in rows], [int(r["label"]) for r in rows]))
    (root / "metrics" / "validation_metrics.json").write_text(json.dumps(metrics, indent=2), encoding="utf-8")
    plots = plot_dud_outputs(root / "tables" / "best_per_ligand.csv", root / "metrics" / "enrichment.csv", root / "plots")
    _write_validation_report(root, "DUD", [system], runner.records, metrics, plots)
    return metrics


def plan_validation(
    set_name: str,
    data_dir: str | Path,
    systems: list[ValidationSystem],
    out_dir: str | Path,
    n_runs: int,
    jobs: int | str,
    cpu_fraction: float,
) -> dict[str, object]:
    resolved_jobs = resolve_jobs(jobs, cpu_fraction)
    return {
        "set": set_name,
        "data_dir": str(data_dir),
        "out": str(out_dir),
        "n_runs": int(n_runs),
        "jobs": resolved_jobs,
        "system_count": len(systems),
        "systems": [asdict(s) for s in systems],
        "commands": [
            f"rbcavity -r <system>_rdock.prm -was",
            f"rbdock -r <system>_rdock.prm -p dock.prm -n {int(n_runs)} -i <ligands>.sd -o <out>",
            "sdsort/sdrmsd for ASTEX or best-pose/enrichment reporting for DUD",
        ],
    }


def validate_many(
    set_name: str,
    data_dir: str | Path,
    out_dir: str | Path,
    system: str | None = None,
    system_list: str | Path | None = None,
    max_systems: int | None = None,
    n_runs: int = 100,
    jobs: int | str = "auto",
    cpu_fraction: float = 0.85,
    download_url: str | None = None,
    download_if_missing: bool = False,
    force: bool = False,
    dry_run: bool = False,
    plan_only: bool = False,
) -> dict[str, object]:
    root_data = ensure_validation_data(data_dir, set_name, download_url, download_if_missing, force=force)
    systems = resolve_systems(root_data, set_name, system, system_list, max_systems)
    plan = plan_validation(set_name, root_data, systems, out_dir, n_runs, jobs, cpu_fraction)
    out = Path(out_dir)
    if dry_run or plan_only:
        out.mkdir(parents=True, exist_ok=True)
        (out / "validation_plan.json").write_text(json.dumps(plan, indent=2), encoding="utf-8")
        return {"dry_run": bool(dry_run), "plan": plan}
    if out.exists() and force:
        shutil.rmtree(out)
    out.mkdir(parents=True, exist_ok=True)
    resolved_jobs = int(plan["jobs"])
    rows: list[dict[str, object]] = []
    failures: list[dict[str, object]] = []
    metrics_by_system: list[dict[str, object]] = []
    per_system_jobs = resolved_jobs if len(systems) == 1 else 1
    system_order = {s.system_id: idx for idx, s in enumerate(systems)}

    def run_system(s: ValidationSystem) -> tuple[int, ValidationSystem, dict[str, object] | None, dict[str, object], Exception | None]:
        run_root = out / s.system_id if len(systems) > 1 else out
        try:
            if set_name.lower() == "astex":
                metrics = validate_astex_system(s, run_root, n_runs=n_runs, jobs=per_system_jobs, force=force)
                row = {
                    "system_id": s.system_id,
                        "top1_rmsd": metrics.get("top1_rmsd"),
                        "best_of_n_rmsd": metrics.get("best_of_n_rmsd"),
                        "top1_SCORE": metrics.get("top1_SCORE"),
                        "success_top1_rmsd_le_2A": metrics.get("success_top1_rmsd_le_2A"),
                        "success_best_rmsd_le_2A": metrics.get("success_best_rmsd_le_2A"),
                    "n_poses": metrics.get("n_poses"),
                    "status": "success",
                }
            elif set_name.lower() == "dud":
                metrics = validate_dud_system(s, run_root, n_runs=n_runs, jobs=per_system_jobs, force=force)
                row = {"system_id": s.system_id, "status": "success", **metrics}
            else:
                raise RDockPipelineError(f"Unsupported validation set: {set_name}")
            return system_order[s.system_id], s, metrics, row, None
        except Exception as exc:
            return system_order[s.system_id], s, None, {"system_id": s.system_id, "status": "failed", "error": str(exc)}, exc

    max_system_workers = min(resolved_jobs, len(systems))
    results: list[tuple[int, ValidationSystem, dict[str, object] | None, dict[str, object], Exception | None]] = []
    if max_system_workers > 1:
        with ThreadPoolExecutor(max_workers=max_system_workers) as pool:
            futures = [pool.submit(run_system, s) for s in systems]
            for fut in as_completed(futures):
                results.append(fut.result())
    else:
        results = [run_system(s) for s in systems]

    for _, s, metrics, row, exc in sorted(results, key=lambda item: item[0]):
        rows.append(row)
        if exc is not None:
            failures.append({"system_id": s.system_id, "error": str(exc)})
            continue
        if metrics is not None:
            metrics_by_system.append({"system_id": s.system_id, **metrics})

    # Per-system outputs are written by each worker. The root directory stores
    # aggregate summaries, plots, manifests, and reports.
    _empty_standard_outputs(out)
    _write_csv(out / "tables" / f"{set_name.lower()}_system_summary.csv", rows)
    if set_name.lower() == "astex":
        top1 = [float(r["top1_rmsd"]) for r in rows if r.get("status") == "success"]
        best_vals = [float(r["best_of_n_rmsd"]) for r in rows if r.get("status") == "success"]
        aggregate = {
            "n_systems_total": len(systems),
            "n_systems_successful": len(top1),
            "n_systems_failed": len(failures),
            "median_top1_rmsd": median(top1) if top1 else None,
            "median_best_rmsd": median(best_vals) if best_vals else None,
            "success_top1_rmsd_le_2A": sum(1 for x in top1 if x <= 2.0),
            "success_best_rmsd_le_2A": sum(1 for x in best_vals if x <= 2.0),
            "n_poses_total": sum(int(r.get("n_poses", 0) or 0) for r in rows),
            "failures": failures,
        }
        plots = plot_astex_outputs(out / "tables" / f"{set_name.lower()}_system_summary.csv", out / "plots")
    else:
        aggregate = {
            "n_systems_total": len(systems),
            "n_systems_successful": len(metrics_by_system),
            "n_systems_failed": len(failures),
            "failures": failures,
        }
        plots = []
    (out / "metrics" / "validation_metrics.json").write_text(json.dumps(aggregate, indent=2), encoding="utf-8")
    _write_validation_report(out, set_name.upper(), systems, [], aggregate, plots)
    return {"metrics": aggregate, "systems": rows}


def validate_astex(data_dir: str | Path, system: str, out_dir: str | Path, n_runs: int = 100, jobs: int | str = 1) -> dict[str, object]:
    result = validate_many("astex", data_dir, out_dir, system=system, n_runs=n_runs, jobs=jobs)
    return dict(result.get("metrics", {}))


def validate_dud(data_dir: str | Path, system: str, out_dir: str | Path, n_runs: int = 100, jobs: int | str = 1) -> dict[str, object]:
    result = validate_many("dud", data_dir, out_dir, system=system, n_runs=n_runs, jobs=jobs)
    return dict(result.get("metrics", {}))


def _write_validation_report(
    root: Path,
    set_name: str,
    systems: list[ValidationSystem],
    commands: list[CommandRecord],
    metrics: dict[str, object],
    plots: list[str],
) -> None:
    manifest = {
        "validation_set": set_name,
        "engine": "real-rdock-official-workflow",
        "systems": [asdict(s) for s in systems],
        "commands": [c.to_dict() for c in commands],
        "metrics": metrics,
        "plots": plots,
        "artifacts": {
            "report": str(root / "report.md"),
            "manifest": str(root / "manifest.json"),
            "config": str(root / "config.yaml"),
            "commands": str(root / "commands.log"),
            "tables": str(root / "tables"),
            "metrics": str(root / "metrics"),
            "plots": str(root / "plots"),
        },
    }
    (root / "manifest.json").write_text(json.dumps(manifest, indent=2), encoding="utf-8")
    (root / "config.yaml").write_text(f"validation_set: {set_name}\nsystems: {[s.system_id for s in systems]}\n", encoding="utf-8")
    top_lines = []
    for item in list(metrics.items())[:20]:
        top_lines.append(f"- {item[0]}: `{item[1]}`")
    plot_lines = [f"- `{p}`" for p in plots] or ["- No plots generated; see `plots/skipped_plots.json` if present."]
    (root / "report.md").write_text(
        "\n".join(
            [
                f"# {set_name} rDock Validation",
                "",
                "## Input Summary",
                f"- Systems: `{', '.join(s.system_id for s in systems)}`",
                f"- System count: `{len(systems)}`",
                "",
                "## Metrics",
                *top_lines,
                "",
                "## Commands",
                f"- Command log: `{root / 'commands.log'}`",
                "- Per-system command logs are stored under each system run directory for multi-system runs.",
                "",
                "## Plots",
                *plot_lines,
                "",
                "## Skipped Steps",
                "- Browser bundle export was removed from the production pipeline.",
                "- No mock docking or surrogate scores are used.",
                "",
                "## Diagnostics",
                f"- Failures: `{json.dumps(metrics.get('failures', []))}`",
            ]
        ),
        encoding="utf-8",
    )