"""WildClean — loaders for the NON-redistributable benchmark pairs.

The WildClean release ships 33 of the 42 paired dirty/clean sets directly
(see pairs/). The remaining 9 sources carry no license or a research-only
status, so we do NOT redistribute them — instead this script downloads them
from their origins and materializes them in exactly the layout the benchmark
expects (pairs/<name>/{dirty.csv,clean.csv}).

Sources fetched here (origins, accessed 2026-06):
  * ed2_restaurants — BigDaMa/ExampleDrivenErrorDetection (no license stated)
  * cleanml_company / cleanml_movie — CleanML 2020 datasets zip (research use)
  * fodors_zagats / dblp_acm / dblp_scholar — Magellan/DeepMatcher EM
    benchmarks (UW-Madison pages; redistribution terms unclear)
  * gidcl_imdb — SICS-FRC GIDCL imdb pair (no license stated)
  * zeroed_billionaire / zeroed_tax100k — WelkinNi/ZeroED pairs (no license)

Usage:
    python loaders.py            # materialize all 9 into ./pairs/
    python loaders.py --only ed2_restaurants gidcl_imdb

Requires: pandas. Mirrors the harvest logic of the ScrubData repo
(training/harvest_stage2.py, training/harvest_stage3_paired.py) so the
resulting pairs are byte-compatible with the published results/paired_bench.json.
"""

from __future__ import annotations

import argparse
import difflib
import io
import re
import urllib.parse
import urllib.request
import zipfile
from pathlib import Path

import pandas as pd

PAIRS = Path(__file__).resolve().parent / "pairs"
UA = {"User-Agent": "wildclean-loader/1.0"}

# ---- origins ---------------------------------------------------------------
ED2 = "https://raw.githubusercontent.com/BigDaMa/ExampleDrivenErrorDetection/master/datasets"
CLEANML_ZIP = "https://www.dropbox.com/s/nerfrhbrseev928/CleanML-datasets-2020.zip?dl=1"
EM_BASE = "https://pages.cs.wisc.edu/~anhai/data1/deepmatcher_data/Structured"
GIDCL = "https://raw.githubusercontent.com/SICS-Fundamental-Research-Center/GIDCL/main/GEIL_Data/imdb/original"
ZEROED = "https://raw.githubusercontent.com/WelkinNi/ZeroED/main/data"

# name -> (zip dir, zip file stem, canonical side)
EM_SETS = {
    "fodors_zagats": ("Fodors-Zagats", "fodors_zagat", "B"),
    "dblp_acm": ("DBLP-ACM", "dblp_acm", "A"),
    "dblp_scholar": ("DBLP-GoogleScholar", "dblp_scholar", "A"),
}


# ---- shared helpers (mirrors training/real_data.py + harvest scripts) ------
def _read_csv(src, **kw) -> pd.DataFrame:
    try:
        return pd.read_csv(src, dtype=str, keep_default_na=False, **kw)
    except UnicodeDecodeError:
        if hasattr(src, "seek"):
            src.seek(0)
        return pd.read_csv(src, dtype=str, keep_default_na=False,
                           encoding="latin-1", **kw)


def _read_url(url: str) -> pd.DataFrame:
    req = urllib.request.Request(url, headers=UA)
    with urllib.request.urlopen(req, timeout=300) as r:
        return _read_csv(io.BytesIO(r.read()))


def _norm(s: str) -> str:
    return "".join(ch.lower() for ch in str(s) if ch.isalnum())


def _is_variant(dirty: str, clean: str) -> bool:
    """True if `dirty` is a SURFACE VARIANT (typo / casing / punctuation /
    minor abbreviation) of `clean` — a learnable canonicalization, not a
    different valid value. Mirrors training/real_data.py."""
    nd, nc = _norm(dirty), _norm(clean)
    if not nd or not nc:
        return False
    if nd == nc:                       # casing / punctuation only
        return True
    return difflib.SequenceMatcher(None, nd, nc).ratio() >= 0.72


def _write_pair(name: str, dirty: pd.DataFrame, clean: pd.DataFrame) -> None:
    n = min(len(dirty), len(clean))
    dirty = dirty.head(n).reset_index(drop=True)
    clean = clean.head(n).reset_index(drop=True)
    d = PAIRS / name
    d.mkdir(parents=True, exist_ok=True)
    dirty.to_csv(d / "dirty.csv", index=False)
    clean.to_csv(d / "clean.csv", index=False)
    diff = sum((dirty.iloc[:, j].astype(str) != clean.iloc[:, j].astype(str)).sum()
               for j in range(min(dirty.shape[1], clean.shape[1])))
    print(f"  {name}: {n} rows x {dirty.shape[1]} cols, {diff} diff cells -> {d}")


# ---- ed2_restaurants --------------------------------------------------------
def load_ed2_restaurants() -> None:
    frames = []
    for kind in ("dirty", "clean"):
        req = urllib.request.Request(f"{ED2}/Restaurants_{kind}.csv", headers=UA)
        with urllib.request.urlopen(req) as r:
            frames.append(_read_csv(io.BytesIO(r.read())))
    dirty, clean = frames
    for df in (dirty, clean):          # re-keyed ids aren't corrections
        for c in list(df.columns):
            if c.lower() == "id":
                df.drop(columns=[c], inplace=True)
    _write_pair("ed2_restaurants", dirty, clean)


# ---- cleanml_company / cleanml_movie ----------------------------------------
def load_cleanml(members=("Company", "Movie")) -> None:
    import tempfile
    tmp = Path(tempfile.gettempdir()) / "cleanml-2020.zip"
    if not tmp.exists():
        print("  downloading CleanML zip (large, one-time)...")
        urllib.request.urlretrieve(CLEANML_ZIP, tmp)
    zf = zipfile.ZipFile(tmp)
    names = zf.namelist()
    for ds in members:
        raw = next((n for n in names if n.endswith(f"{ds}/raw/raw.csv")), None)
        cln = next((n for n in names
                    if n.endswith(f"{ds}/raw/inconsistency_clean_raw.csv")), None)
        if not raw or not cln:
            print(f"  cleanml_{ds.lower()}: pair not found in zip — skipped")
            continue
        dirty = _read_csv(zf.open(raw))
        clean = _read_csv(zf.open(cln))
        _write_pair(f"cleanml_{ds.lower()}", dirty, clean)


# ---- fodors_zagats / dblp_acm / dblp_scholar (EM benchmarks -> pair tables) --
def load_em() -> None:
    """Turn entity-matching benchmarks into row-aligned pair TABLES: one row per
    gold match, dirty side = messy table, clean side = canonical table. Matched
    records may legitimately DISAGREE on an attribute (cuisine classification,
    author-list format) — that is not an error; only surface-variant diffs are
    kept as (dirty, clean) corrections, otherwise the messy value is accepted
    as truth on both sides (the VARIANT MASK)."""
    for name, (zdir, stem, canon_side) in EM_SETS.items():
        req = urllib.request.Request(f"{EM_BASE}/{zdir}/{stem}_raw_data.zip",
                                     headers=UA)
        with urllib.request.urlopen(req) as r:
            zf = zipfile.ZipFile(io.BytesIO(r.read()))
        A = _read_csv(zf.open("tableA.csv"))
        B = _read_csv(zf.open("tableB.csv"))
        M = _read_csv(zf.open("matches.csv"))
        a = A.set_index(A.columns[0])
        b = B.set_index(B.columns[0])
        cols = [c for c in a.columns if c in b.columns]
        dirty_rows, clean_rows, seen = [], [], set()
        masked = 0
        for _, m in M.iterrows():
            ia, ib = str(m.iloc[0]), str(m.iloc[1])
            if ia not in a.index or ib not in b.index or ia in seen:
                continue
            seen.add(ia)
            ra = a.loc[ia] if not isinstance(a.loc[ia], pd.DataFrame) else a.loc[ia].iloc[0]
            rb = b.loc[ib] if not isinstance(b.loc[ib], pd.DataFrame) else b.loc[ib].iloc[0]
            canon, messy = (ra, rb) if canon_side == "A" else (rb, ra)
            drow, crow = [], []
            for c in cols:
                dv, cv = str(messy[c]), str(canon[c])
                if dv != cv and not _is_variant(dv, cv):
                    cv = dv
                    masked += 1
                drow.append(dv)
                crow.append(cv)
            dirty_rows.append(drow)
            clean_rows.append(crow)
        print(f"  {name}: masked {masked} non-variant attribute disagreements")
        _write_pair(name, pd.DataFrame(dirty_rows, columns=cols),
                    pd.DataFrame(clean_rows, columns=cols))


# ---- gidcl_imdb --------------------------------------------------------------
def load_gidcl_imdb(max_clean_sample: int = 30000) -> None:
    """Row-aligned SUBSET of the 1M-row GIDCL imdb pair: every dirty row plus a
    deterministic sample of clean rows (keeps the pair small but error-complete)."""
    dirty = _read_url(f"{GIDCL}/dirty.csv")
    clean = _read_url(f"{GIDCL}/clean.csv")
    n = min(len(dirty), len(clean))
    dirty, clean = dirty.head(n), clean.head(n)
    neq = (dirty.astype(str).values != clean.astype(str).values).any(axis=1)
    err_idx = dirty.index[neq]
    clean_idx = dirty.index[~neq][:: max(1, (n - len(err_idx)) // max_clean_sample)][:max_clean_sample]
    keep = sorted(set(err_idx) | set(clean_idx))
    _write_pair("gidcl_imdb", dirty.loc[keep], clean.loc[keep])


# ---- zeroed_billionaire / zeroed_tax100k -------------------------------------
def load_zeroed(names=("billionaire", "tax100k")) -> None:
    for nm in names:
        dirty = _read_url(f"{ZEROED}/{nm}_error-01.csv")
        clean = _read_url(f"{ZEROED}/{nm}_clean.csv")
        _write_pair(f"zeroed_{nm}", dirty, clean)


LOADERS = {
    "ed2_restaurants": load_ed2_restaurants,
    "cleanml": load_cleanml,            # cleanml_company + cleanml_movie
    "em": load_em,                      # fodors_zagats + dblp_acm + dblp_scholar
    "gidcl_imdb": load_gidcl_imdb,
    "zeroed": load_zeroed,              # zeroed_billionaire + zeroed_tax100k
}


def main() -> None:
    ap = argparse.ArgumentParser(description=__doc__)
    ap.add_argument("--only", nargs="*", default=None,
                    help=f"subset of loaders to run: {sorted(LOADERS)}")
    args = ap.parse_args()
    todo = args.only or list(LOADERS)
    print(f"WildClean loaders -> {PAIRS}")
    for key in todo:
        if key not in LOADERS:
            print(f"  unknown loader '{key}' (choices: {sorted(LOADERS)})")
            continue
        print(f"[{key}]")
        LOADERS[key]()
    print("done — the full 42-pair benchmark is now materialized under pairs/.")


if __name__ == "__main__":
    main()