#!/usr/bin/env python3
"""Build WorkSurface-Build from the official WorkSurface/Workspace releases.

The benchmark intentionally has no gold surface representation.  The Builder
sees raw files, a role brief, a budget, and (for the persona track) calibration
episodes.  Questions and existing WorkSurface gold remain evaluator-private
until the resulting artifacts have been frozen.
"""

from __future__ import annotations

import argparse
import concurrent.futures
import hashlib
import json
import os
import re
import shutil
import subprocess
import time
import urllib.error
import urllib.parse
import urllib.request
from collections import Counter, defaultdict
from pathlib import Path
from typing import Any, Iterable


HERE = Path(__file__).resolve().parent
PROJECT = HERE.parent
DEFAULT_TASKS = PROJECT / "official_worksurface_data" / "data" / "tasks.jsonl"
DEFAULT_LOCK = PROJECT / "official_worksurface_bench" / "data" / "wsb_lock.json"
DEFAULT_CACHE = HERE / "cache" / "workspace-bench-lite-en"
DEFAULT_OUTPUT = HERE / "release"
CORE_EXTENSIONS = {
    ".csv", ".xlsx", ".xls", ".txt", ".md", ".json", ".py", ".java",
    ".xml", ".html",
}

ROLE_BRIEFS = {
    "Backend Developer": "Maintain software, permissions, services, tests, and technical documentation.",
    "Logistics Manager": "Manage administration, logistics, procurement, inventory, personnel, and operations.",
    "Operations Manager": "Analyze markets, customers, products, campaigns, sales, and operational performance.",
    "Product Manager": "Synthesize product requirements, user evidence, metrics, plans, and stakeholder records.",
    "Researcher": "Analyze literature, experiments, datasets, statistical evidence, and research reports.",
}


def canonical_json(value: Any) -> bytes:
    return json.dumps(value, ensure_ascii=False, sort_keys=True, separators=(",", ":")).encode("utf-8")


def sha256_bytes(value: bytes) -> str:
    return hashlib.sha256(value).hexdigest()


def sha256_file(path: Path) -> str:
    digest = hashlib.sha256()
    with path.open("rb") as handle:
        for chunk in iter(lambda: handle.read(1024 * 1024), b""):
            digest.update(chunk)
    return digest.hexdigest()


def write_json(path: Path, value: Any) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    path.write_text(json.dumps(value, ensure_ascii=False, indent=2) + "\n", encoding="utf-8")


def write_jsonl(path: Path, rows: Iterable[dict[str, Any]]) -> None:
    path.parent.mkdir(parents=True, exist_ok=True)
    with path.open("w", encoding="utf-8") as handle:
        for row in rows:
            handle.write(json.dumps(row, ensure_ascii=False) + "\n")


def read_jsonl(path: Path) -> list[dict[str, Any]]:
    return [json.loads(line) for line in path.read_text(encoding="utf-8").splitlines() if line.strip()]


def persona_slug(persona: str) -> str:
    return re.sub(r"[^a-z0-9]+", "_", persona.lower()).strip("_")


def normalized_hash(expected: str) -> str:
    return expected.split(":", 1)[-1].lower()


def download_url(url: str, target: Path, expected_hash: str | None, retries: int = 4) -> str:
    if target.exists() and (not expected_hash or sha256_file(target) == normalized_hash(expected_hash)):
        return "cached"
    target.parent.mkdir(parents=True, exist_ok=True)
    temp = target.with_name(target.name + ".partial")
    for attempt in range(1, retries + 1):
        try:
            # curl is used here because the local Python/OpenSSL route to the
            # Hugging Face CDN can stall before TLS negotiation, while the
            # system curl route is stable.  Downloads remain resumable at the
            # file level and are always verified against the upstream lock.
            completed = subprocess.run(
                [
                    "curl", "-sS", "-L", "--fail",
                    "--connect-timeout", "10", "--max-time", "180",
                    "--retry", "2", "--retry-all-errors",
                    "-A", "WorkSurface-Build/0.1",
                    "-o", str(temp), url,
                ],
                capture_output=True,
                text=True,
                timeout=600,
            )
            if completed.returncode != 0:
                raise OSError(completed.stderr.strip() or f"curl exit {completed.returncode}")
            if expected_hash and sha256_file(temp) != normalized_hash(expected_hash):
                raise ValueError(f"hash mismatch for {target}")
            os.replace(temp, target)
            return "downloaded"
        except (OSError, ValueError, urllib.error.URLError) as exc:
            temp.unlink(missing_ok=True)
            if attempt == retries:
                raise RuntimeError(f"failed to download {url}: {exc}") from exc
            time.sleep(min(8, 2 ** (attempt - 1)))
    raise AssertionError("unreachable")


def download_workspace_files(
    lock: dict[str, Any], cache: Path, tier: str, workers: int
) -> dict[str, int]:
    revision = lock["wsb_commit"]
    base = (
        "https://huggingface.co/datasets/Workspace-Bench/Workspace-Bench-Lite/resolve/"
        f"{revision}/task_lite_clean_en"
    )
    metadata_jobs: list[tuple[str, Path, str | None]] = []
    for task_id in lock["task_id_to_file_hashes"]:
        meta_url = f"{base}/{task_id}/metadata.json"
        metadata_jobs.append((meta_url, cache / task_id / "metadata.json", None))

    counts: Counter[str] = Counter()
    with concurrent.futures.ThreadPoolExecutor(max_workers=workers) as pool:
        futures = [pool.submit(download_url, *job) for job in metadata_jobs]
        for future in concurrent.futures.as_completed(futures):
            counts[future.result()] += 1

    jobs: list[tuple[str, Path, str | None]] = []
    for task_id, files in lock["task_id_to_file_hashes"].items():
        metadata = json.loads((cache / task_id / "metadata.json").read_text(encoding="utf-8"))
        stored_paths = {
            item["filename"]: item["stored_relpath"]
            for item in metadata.get("data_manifest", [])
        }
        for filename, expected in files.items():
            if tier == "core" and Path(filename).suffix.lower() not in CORE_EXTENSIONS:
                continue
            stored_relpath = stored_paths.get(filename)
            if not stored_relpath:
                raise RuntimeError(f"metadata for task {task_id} has no stored path for {filename}")
            quoted_path = "/".join(urllib.parse.quote(part, safe="") for part in stored_relpath.split("/"))
            jobs.append((f"{base}/{task_id}/{quoted_path}", cache / task_id / "data" / filename, expected))

    with concurrent.futures.ThreadPoolExecutor(max_workers=workers) as pool:
        futures = [pool.submit(download_url, *job) for job in jobs]
        for future in concurrent.futures.as_completed(futures):
            counts[future.result()] += 1
    counts["jobs"] = len(metadata_jobs) + len(jobs)
    return dict(counts)


def link_or_copy(source: Path, target: Path) -> None:
    target.parent.mkdir(parents=True, exist_ok=True)
    if target.exists():
        if source.stat().st_size == target.stat().st_size and sha256_file(source) == sha256_file(target):
            return
        raise RuntimeError(f"refusing to replace different release file: {target}")
    try:
        os.link(source, target)
    except OSError:
        shutil.copy2(source, target)


def public_question(task: dict[str, Any]) -> dict[str, Any]:
    return {
        "id": task["id"],
        "question": task["question"],
        "difficulty": task.get("difficulty", "unknown"),
        "answer_type": task.get("answer_type", "string"),
        "efficiency_budget_tokens": task.get("efficiency_budget_tokens"),
    }


def calibration_episode(task: dict[str, Any]) -> dict[str, Any]:
    return {
        "id": task["id"],
        "question": task["question"],
        "answer": task["gold_answer"],
        "answer_type": task.get("answer_type", "string"),
    }


def task_commitment(tasks: list[dict[str, Any]]) -> str:
    return "sha256:" + sha256_bytes(canonical_json(tasks))


def stable_calibration_sources(source_ids: list[str], ratio: float, seed: str) -> set[str]:
    ordered = sorted(
        source_ids,
        key=lambda source: sha256_bytes(f"{seed}:{source}".encode("utf-8")),
    )
    if len(ordered) <= 1 or ratio <= 0:
        return set()
    count = max(1, min(len(ordered) - 1, round(len(ordered) * ratio)))
    return set(ordered[:count])


def raw_evidence_name(evidence: dict[str, Any], source_id: str) -> str | None:
    value = evidence.get("source_file")
    if value:
        return Path(str(value)).name
    if evidence.get("surface") == "rag" and evidence.get("file"):
        value = Path(str(evidence["file"])).name
        value = re.sub(rf"^t{re.escape(source_id)}__", "", value)
        if value.endswith(".md"):
            value = value[:-3]
        return value
    path = evidence.get("graph_path") or []
    if path:
        value = str(path[-1]).split("::", 1)[-1]
        if "." in value:
            return Path(value).name
    return None


def norm_filename(value: str) -> str:
    return re.sub(r"[^a-z0-9]+", "", value.lower())


def evidence_mapping_audit(tasks: list[dict[str, Any]], lock: dict[str, Any]) -> dict[str, Any]:
    total = checked = hits = 0
    misses: list[dict[str, str]] = []
    for task in tasks:
        source_id = str(task["source"]["task_id"])
        raw_names = list(lock["task_id_to_file_hashes"][source_id])
        normalized = {norm_filename(name): name for name in raw_names}
        for evidence in task.get("gold_evidence", []):
            total += 1
            candidate = raw_evidence_name(evidence, source_id)
            if not candidate:
                continue
            checked += 1
            key = norm_filename(candidate)
            matched = key in normalized
            if not matched:
                matched = any(key.startswith(raw_key) or raw_key.startswith(key) for raw_key in normalized)
            if matched:
                hits += 1
            elif len(misses) < 50:
                misses.append({"task_id": task["id"], "source_task_id": source_id, "candidate": candidate})
    return {
        "total_gold_evidence_items": total,
        "file_addressable_evidence_items": checked,
        "mapped_evidence_items": hits,
        "file_addressable_coverage": round(checked / total, 6) if total else None,
        "mapping_rate_given_file_addressable": round(hits / checked, 6) if checked else None,
        "sample_misses": misses,
    }


def build_release(
    tasks: list[dict[str, Any]],
    lock: dict[str, Any],
    cache: Path,
    output: Path,
    tier: str,
    calibration_ratio: float,
    seed: str,
) -> dict[str, Any]:
    public = output / "public"
    private = output / "private"
    by_source: dict[str, list[dict[str, Any]]] = defaultdict(list)
    by_persona_sources: dict[str, set[str]] = defaultdict(set)
    for task in tasks:
        source_id = str(task["source"]["task_id"])
        persona = task["source"]["persona"]
        by_source[source_id].append(task)
        by_persona_sources[persona].add(source_id)

    if set(by_source) != set(lock["task_id_to_file_hashes"]):
        raise RuntimeError("official WorkSurface source tasks do not match the Workspace-Bench lock")

    task_unit_rows: list[dict[str, Any]] = []
    total_public_files = total_public_bytes = 0
    for source_id in sorted(by_source, key=int):
        source_tasks = sorted(by_source[source_id], key=lambda item: item["id"])
        persona = source_tasks[0]["source"]["persona"]
        unit_id = f"task_{int(source_id):03d}"
        workspace = public / "task_units" / unit_id / "workspace"
        workspace.mkdir(parents=True, exist_ok=True)
        source_data = cache / source_id / "data"
        included: list[dict[str, Any]] = []
        for filename, expected in lock["task_id_to_file_hashes"][source_id].items():
            source_file = source_data / filename
            if not source_file.exists():
                continue
            link_or_copy(source_file, workspace / filename)
            included.append({
                "path": filename,
                "bytes": source_file.stat().st_size,
                "sha256": "sha256:" + sha256_file(source_file),
            })
            total_public_files += 1
            total_public_bytes += source_file.stat().st_size

        commitment = task_commitment(source_tasks)
        unit = {
            "unit_id": unit_id,
            "protocol": "zero_calibration_build_once_then_hidden_queries",
            "persona": persona,
            "role_brief": ROLE_BRIEFS[persona],
            "workspace": "workspace",
            "source_task_id": source_id,
            "calibration_episodes": [],
            "hidden_task_count": len(source_tasks),
            "hidden_task_commitment": commitment,
            "build_budget": {"policy": "runner_defined", "must_be_recorded": True},
            "raw_fallback_policy": "runner_defined_and_reported",
            "files": included,
        }
        unit_dir = public / "task_units" / unit_id
        write_json(unit_dir / "unit.json", unit)
        write_jsonl(private / "task_units" / f"{unit_id}.jsonl", source_tasks)
        write_jsonl(private / "serve_questions" / f"{unit_id}.jsonl", map(public_question, source_tasks))
        metadata = cache / source_id / "metadata.json"
        if metadata.exists():
            link_or_copy(metadata, private / "source_metadata" / f"{unit_id}.json")
        task_unit_rows.append({
            "unit_id": unit_id,
            "persona": persona,
            "source_task_id": source_id,
            "workspace": str((unit_dir / "workspace").relative_to(output)),
            "unit_spec": str((unit_dir / "unit.json").relative_to(output)),
            "hidden_task_count": len(source_tasks),
            "hidden_task_commitment": commitment,
        })
    write_jsonl(public / "task_units.jsonl", task_unit_rows)

    persona_unit_rows: list[dict[str, Any]] = []
    persona_split_summary: dict[str, Any] = {}
    for persona in sorted(by_persona_sources):
        slug = persona_slug(persona)
        source_ids = sorted(by_persona_sources[persona], key=int)
        calibration_sources = stable_calibration_sources(source_ids, calibration_ratio, f"{seed}:{persona}")
        hidden_sources = set(source_ids) - calibration_sources
        calibration: list[dict[str, Any]] = []
        hidden: list[dict[str, Any]] = []
        for source_id in source_ids:
            source_tasks = sorted(by_source[source_id], key=lambda item: item["id"])
            if source_id in calibration_sources:
                calibration.append(calibration_episode(source_tasks[0]))
            else:
                hidden.extend(source_tasks)
        hidden.sort(key=lambda item: item["id"])

        unit_dir = public / "persona_units" / slug
        workspace_dir = unit_dir / "workspace"
        workspace_entries: list[dict[str, Any]] = []
        for source_id in source_ids:
            task_unit = public / "task_units" / f"task_{int(source_id):03d}" / "workspace"
            link = workspace_dir / f"source_task_{int(source_id):03d}"
            link.parent.mkdir(parents=True, exist_ok=True)
            if not link.exists():
                relative = os.path.relpath(task_unit, link.parent)
                link.symlink_to(relative, target_is_directory=True)
            workspace_entries.append({"source_task_id": source_id, "path": link.name})

        commitment = task_commitment(hidden)
        unit = {
            "unit_id": f"persona_{slug}",
            "protocol": "cross_source_calibration_build_once_then_hidden_queries",
            "persona": persona,
            "role_brief": ROLE_BRIEFS[persona],
            "workspace": "workspace",
            "workspace_sources": workspace_entries,
            "calibration_episodes": calibration,
            "hidden_task_count": len(hidden),
            "hidden_task_commitment": commitment,
            "build_budget": {"policy": "runner_defined", "must_be_recorded": True},
            "raw_fallback_policy": "runner_defined_and_reported",
        }
        write_json(unit_dir / "unit.json", unit)
        write_jsonl(private / "persona_units" / f"persona_{slug}.jsonl", hidden)
        write_jsonl(private / "persona_serve_questions" / f"persona_{slug}.jsonl", map(public_question, hidden))
        write_json(private / "persona_splits" / f"persona_{slug}.json", {
            "calibration_source_task_ids": sorted(calibration_sources, key=int),
            "hidden_source_task_ids": sorted(hidden_sources, key=int),
        })
        persona_unit_rows.append({
            "unit_id": unit["unit_id"],
            "persona": persona,
            "workspace": str(workspace_dir.relative_to(output)),
            "unit_spec": str((unit_dir / "unit.json").relative_to(output)),
            "hidden_task_count": len(hidden),
            "hidden_task_commitment": commitment,
        })
        persona_split_summary[persona] = {
            "workspace_source_tasks": len(source_ids),
            "calibration_source_tasks": len(calibration_sources),
            "calibration_episodes": len(calibration),
            "hidden_source_tasks": len(hidden_sources),
            "hidden_tasks": len(hidden),
        }
    write_jsonl(public / "persona_units.jsonl", persona_unit_rows)

    manifest = {
        "name": "WorkSurface-Build",
        "version": "0.1.0",
        "construction": "annotation_reuse_only",
        "gold_surface_required": False,
        "source": {
            "worksurface_tasks": str(DEFAULT_TASKS),
            "worksurface_task_count": len(tasks),
            "workspace_bench_repo": lock["wsb_repo"],
            "workspace_bench_commit": lock["wsb_commit"],
            "workspace_tier": tier,
        },
        "task_unit_track": {
            "units": len(task_unit_rows),
            "hidden_tasks": sum(row["hidden_task_count"] for row in task_unit_rows),
            "raw_files": total_public_files,
            "raw_bytes": total_public_bytes,
        },
        "persona_reuse_track": {
            "units": len(persona_unit_rows),
            "calibration_ratio_by_source_task": calibration_ratio,
            "seed": seed,
            "splits": persona_split_summary,
            "hidden_tasks": sum(row["hidden_task_count"] for row in persona_unit_rows),
        },
        "task_type_distribution": dict(sorted(Counter(task["task_type"] for task in tasks).items())),
        "surface_combo_distribution_evaluator_only": dict(sorted(Counter(
            "+".join(sorted(task["required_surfaces"])) for task in tasks
        ).items())),
        "evidence_mapping_audit": evidence_mapping_audit(tasks, lock),
        "security_boundary": {
            "builder_visible": "public/** only",
            "evaluator_only": "private/** and manifest evaluator-only fields",
            "rule": "hidden questions are released only after artifact freeze",
        },
    }
    write_json(output / "manifest.json", manifest)
    return manifest


def main() -> None:
    parser = argparse.ArgumentParser(description=__doc__)
    parser.add_argument("--tasks", type=Path, default=DEFAULT_TASKS)
    parser.add_argument("--wsb-lock", type=Path, default=DEFAULT_LOCK)
    parser.add_argument("--cache", type=Path, default=DEFAULT_CACHE)
    parser.add_argument("--output", type=Path, default=DEFAULT_OUTPUT)
    parser.add_argument("--tier", choices=("core", "full"), default="core")
    parser.add_argument("--workers", type=int, default=8)
    parser.add_argument("--calibration-ratio", type=float, default=0.2)
    parser.add_argument("--seed", default="worksurface-build-v0.1")
    parser.add_argument("--skip-download", action="store_true")
    args = parser.parse_args()

    tasks = read_jsonl(args.tasks)
    lock = json.loads(args.wsb_lock.read_text(encoding="utf-8"))
    if not args.skip_download:
        download_stats = download_workspace_files(lock, args.cache, args.tier, args.workers)
        print(json.dumps({"download": download_stats}, ensure_ascii=False))
    manifest = build_release(
        tasks, lock, args.cache, args.output, args.tier,
        args.calibration_ratio, args.seed,
    )
    print(json.dumps({
        "output": str(args.output.resolve()),
        "task_units": manifest["task_unit_track"]["units"],
        "task_unit_hidden_tasks": manifest["task_unit_track"]["hidden_tasks"],
        "persona_units": manifest["persona_reuse_track"]["units"],
        "persona_hidden_tasks": manifest["persona_reuse_track"]["hidden_tasks"],
        "raw_files": manifest["task_unit_track"]["raw_files"],
    }, ensure_ascii=False, indent=2))


if __name__ == "__main__":
    main()