#!/usr/bin/env python3
"""Prepare an anonymized BeliefSim dataset package for Hugging Face.

The script keeps claims, participant judgments, evaluation triplets, and WVS
group priors. It drops direct identifiers, IP/location metadata, and open-text
free-response notes.
"""

import hashlib
import json
import re
import zipfile
from pathlib import Path
from xml.etree import ElementTree as ET

import pandas as pd


ROOT = Path(__file__).resolve().parents[2]
OUT = Path(__file__).resolve().parents[1] / "data"
SALT = "beliefsim-release-v1"


PANDORA_PATH = ROOT / "misinfo_combined_latest_with_acc_new.csv"
MIST_PATH = ROOT / "wvs_misinfo" / "MIST - Sample 1 - Raw Dataset.csv"
MIST_ITEM_DB = ROOT / "wvs_misinfo" / "MIST - Phase 4 - Item Database (January 2020).xlsx"

WVS_FILES = {
    "gender": ROOT / "wvs_misinfo" / "gender_alldimensions_wvs.csv",
    "living_area": ROOT / "wvs_misinfo" / "urbrur_alldimensions_wvs.csv",
    "age": ROOT / "wvs_misinfo" / "age_alldimensions.csv",
    "education": ROOT / "wvs_misinfo" / "education_alldimensions.csv",
}


def anonymize(prefix: str, *parts: object) -> str:
    raw = "|".join("" if p is None else str(p) for p in parts)
    digest = hashlib.sha256(f"{SALT}|{prefix}|{raw}".encode("utf-8")).hexdigest()[:16]
    return f"{prefix}_{digest}"


def clean_text(value: object) -> str:
    if pd.isna(value):
        return ""
    return re.sub(r"\s+", " ", str(value)).strip()


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


def first_nonempty(row: pd.Series, candidates: list) -> str:
    for col in candidates:
        if col in row.index:
            val = clean_text(row[col])
            if val and val.lower() != "nan":
                return val
    return ""


def extract_claim(prompt_text: str) -> str:
    text = re.sub(r"^\s*News:\s*", "", clean_text(prompt_text), flags=re.I)
    for marker in ["Supporting Stance:", "Refuting Stance:", "Your responses:", "Your response:"]:
        if marker in text:
            text = text.split(marker, 1)[0]
    return clean_text(text)


def standardize_pandora_judgment(value: object) -> str:
    v = norm(value)
    if not v:
        return ""
    if "importid" in v or v in {"true information", "misinformation", "have you heard of the information before", "comments notes"}:
        return ""
    if "true information" in v or v in {"true", "real"}:
        return "true_information"
    if "misinformation" in v or v in {"false", "fake"}:
        return "misinformation"
    if "not sure" in v or "unsure" in v:
        return "not_sure"
    return clean_text(value)


def standardize_mist_judgment(value: object) -> str:
    v = norm(value)
    if not v:
        return ""
    if v in {"real", "true", "1"} or "real" in v:
        return "true_information"
    if v in {"fake", "false", "0"} or "fake" in v:
        return "misinformation"
    return clean_text(value)


def age_bucket(value: object) -> str:
    s = clean_text(value)
    if not s:
        return ""
    m = re.search(r"\d+", s)
    if not m:
        return s
    age = int(m.group())
    if age < 30:
        return "18-29"
    if age < 45:
        return "30-44"
    if age < 60:
        return "45-59"
    return "60+"


def education_bucket(value: object) -> str:
    v = norm(value)
    if not v:
        return ""
    completed = [
        "bachelor",
        "master",
        "doctor",
        "professional",
        "college degree",
        "university",
        "graduate",
    ]
    if any(token in v for token in completed):
        return "completed"
    return "not_completed"


def load_pandora() -> tuple:
    if not PANDORA_PATH.exists():
        return [], [], []

    raw = pd.read_csv(PANDORA_PATH, header=None, dtype=str, low_memory=False)
    qids = [clean_text(x) for x in raw.iloc[0].tolist()]
    labels = [clean_text(x) for x in raw.iloc[1].tolist()]
    columns = []
    seen: dict = {}
    qid_map: dict = {}
    for qid, label in zip(qids, labels):
        base = label or qid or "unnamed"
        seen[base] = seen.get(base, 0) + 1
        col = base if seen[base] == 1 else f"{base}__{seen[base]}"
        columns.append(col)
        if qid:
            qid_map[col] = qid

    # Qualtrics export rows: machine ids, question text, choice/import rows, then responses.
    df = raw.iloc[4:].copy()
    df.columns = columns
    news_cols = [c for c in df.columns if norm(c).startswith("news")]

    claims: dict[str, dict] = {}
    judgments: list = []
    instances: list = []

    # In this Qualtrics export the answer to "Your responses" is stored in the
    # same column as the long claim prompt; the next two columns are heard-before
    # and free-text notes, which are intentionally not released.
    response_cols = {c: c for c in news_cols}
    demo_cols = {
        "gender": ["What is your gender?", "gender"],
        "age_group": ["How old are you?", "age"],
        "living_area": ["How would you describe the area you live in?", "area", "living_area"],
        "education_bucket": [
            "What is the highest level of education you have completed?",
            "degree",
            "education",
        ],
    }
    id_candidates = ["ResponseId", "Response ID", "PROLIFIC_ID"]

    for row_idx, row in df.iterrows():
        row_judgments = []
        participant_id = anonymize("pandora", row_idx, first_nonempty(row, id_candidates))
        demographics = {}
        for key, candidates in demo_cols.items():
            val = first_nonempty(row, candidates)
            demographics[key] = education_bucket(val) if key == "education_bucket" else clean_text(val)

        if demographics.get("age_group"):
            demographics["age_group"] = age_bucket(demographics["age_group"])

        for news_col in news_cols:
            prompt_text = clean_text(row.get(news_col, ""))
            resp_col = response_cols.get(news_col, "")
            judgment = standardize_pandora_judgment(row.get(resp_col, "")) if resp_col else ""
            claim_text = extract_claim(prompt_text)
            if not claim_text or not judgment:
                continue
            claim_id = qid_map.get(news_col, "") or anonymize("pandora_claim", news_col)
            claims[claim_id] = {
                "source": "PANDORA",
                "claim_id": claim_id,
                "claim_text": claim_text,
                "gold_label": "",
                "content_warning": True,
            }
            record = {
                "source": "PANDORA",
                "participant_id": participant_id,
                "claim_id": claim_id,
                "judgment": judgment,
                **demographics,
            }
            judgments.append(record)
            row_judgments.append(record)

        for i in range(2, len(row_judgments)):
            b1, b2, target = row_judgments[i - 2], row_judgments[i - 1], row_judgments[i]
            instances.append(
                {
                    "source": "PANDORA",
                    "instance_id": anonymize("pandora_instance", participant_id, target["claim_id"], i),
                    "participant_id": participant_id,
                    "target_claim_id": target["claim_id"],
                    "target_judgment": target["judgment"],
                    "observed_claim_1_id": b1["claim_id"],
                    "observed_judgment_1": b1["judgment"],
                    "observed_claim_2_id": b2["claim_id"],
                    "observed_judgment_2": b2["judgment"],
                    **demographics,
                }
            )

    return list(claims.values()), judgments, instances


def read_xlsx_first_sheet(path):
    """Read a simple XLSX first sheet using only the Python standard library."""
    ns = {"a": "http://schemas.openxmlformats.org/spreadsheetml/2006/main"}
    with zipfile.ZipFile(str(path)) as zf:
        shared = []
        if "xl/sharedStrings.xml" in zf.namelist():
            root = ET.fromstring(zf.read("xl/sharedStrings.xml"))
            for item in root.findall(".//a:si", ns):
                shared.append("".join(t.text or "" for t in item.findall(".//a:t", ns)))

        sheet_name = "xl/worksheets/sheet1.xml"
        root = ET.fromstring(zf.read(sheet_name))
        rows = []
        for row in root.findall(".//a:sheetData/a:row", ns):
            values = []
            for cell in row.findall("a:c", ns):
                cell_type = cell.attrib.get("t", "")
                value_node = cell.find("a:v", ns)
                inline_node = cell.find("a:is/a:t", ns)
                value = ""
                if inline_node is not None:
                    value = inline_node.text or ""
                elif value_node is not None:
                    raw = value_node.text or ""
                    value = shared[int(raw)] if cell_type == "s" and raw.isdigit() and int(raw) < len(shared) else raw
                values.append(value)
            rows.append(values)

    if not rows:
        return pd.DataFrame()
    width = max(len(r) for r in rows)
    rows = [r + [""] * (width - len(r)) for r in rows]
    header = [clean_text(x) or "column_{}".format(i) for i, x in enumerate(rows[0])]
    return pd.DataFrame(rows[1:], columns=header)


def load_mist_item_db() -> pd.DataFrame:
    try:
        db = pd.read_excel(MIST_ITEM_DB, dtype=str)
    except ImportError:
        db = read_xlsx_first_sheet(MIST_ITEM_DB)
    cols = {norm(c): c for c in db.columns}
    id_col = cols.get("id") or next((c for c in db.columns if norm(c) == "id"), "")
    headline_col = (
        cols.get("headline")
        or cols.get("item")
        or next((c for c in db.columns if "headline" in norm(c) or "item" == norm(c)), "")
    )
    out = db[[id_col, headline_col]].copy()
    out.columns = ["item_id", "claim_text"]
    out["gold_label"] = out["item_id"].map(lambda x: "true_information" if clean_text(x).upper().startswith("R") else "misinformation")
    out["claim_id"] = [f"MIST_{i + 1}" for i in range(len(out))]
    return out


def load_mist() -> tuple:
    if not MIST_PATH.exists() or not MIST_ITEM_DB.exists():
        return [], [], []

    df = pd.read_csv(MIST_PATH, dtype=str, low_memory=False)
    item_db = load_mist_item_db()
    claims = [
        {
            "source": "MIST-1",
            "claim_id": row.claim_id,
            "claim_text": clean_text(row.claim_text),
            "gold_label": row.gold_label,
            "content_warning": True,
        }
        for row in item_db.itertuples(index=False)
    ]
    claim_ids = item_db["claim_id"].tolist()
    mist_cols = [c for c in df.columns if re.fullmatch(r"MIST_\d+", clean_text(c))]
    if not mist_cols:
        mist_cols = [c for c in df.columns if clean_text(c) in claim_ids]

    judgments: list = []
    instances: list = []
    gender_cols = [c for c in df.columns if norm(c) in {"gender", "sex"} or "gender" in norm(c)]
    age_cols = [c for c in df.columns if norm(c) == "age" or "age" in norm(c)]
    edu_cols = [c for c in df.columns if "education" in norm(c) or "degree" in norm(c)]

    for row_idx, row in df.iterrows():
        demographics = {
            "gender": first_nonempty(row, gender_cols),
            "age_group": age_bucket(first_nonempty(row, age_cols)),
            "living_area": "",
            "education_bucket": education_bucket(first_nonempty(row, edu_cols)),
        }
        participant_id = anonymize("mist", row_idx)
        row_judgments = []
        for col in mist_cols:
            judgment = standardize_mist_judgment(row.get(col, ""))
            if not judgment:
                continue
            rec = {
                "source": "MIST-1",
                "participant_id": participant_id,
                "claim_id": clean_text(col),
                "judgment": judgment,
                **demographics,
            }
            judgments.append(rec)
            row_judgments.append(rec)

        for i in range(2, len(row_judgments)):
            b1, b2, target = row_judgments[i - 2], row_judgments[i - 1], row_judgments[i]
            instances.append(
                {
                    "source": "MIST-1",
                    "instance_id": anonymize("mist_instance", participant_id, target["claim_id"], i),
                    "participant_id": participant_id,
                    "target_claim_id": target["claim_id"],
                    "target_judgment": target["judgment"],
                    "observed_claim_1_id": b1["claim_id"],
                    "observed_judgment_1": b1["judgment"],
                    "observed_claim_2_id": b2["claim_id"],
                    "observed_judgment_2": b2["judgment"],
                    **demographics,
                }
            )

    return claims, judgments, instances


def load_wvs_priors() -> list:
    records: list = []
    for axis, path in WVS_FILES.items():
        if not path.exists():
            continue
        df = pd.read_csv(path, dtype=str)
        q_col = next((c for c in df.columns if norm(c) in {"question", "question text"}), "")
        id_col = next((c for c in df.columns if norm(c) in {"question no", "question_no", "qid"}), "")
        for _, row in df.iterrows():
            for col in df.columns:
                n = norm(col)
                if not n.endswith("distribution") or n == "overall distribution":
                    continue
                group = re.sub(r"_?distribution$", "", col).strip("_")
                most_col = f"{group}_most"
                least_col = f"{group}_least"
                records.append(
                    {
                        "demographic_axis": axis,
                        "group": group,
                        "question_id": clean_text(row.get(id_col, "")) if id_col else "",
                        "question_text": clean_text(row.get(q_col, "")) if q_col else "",
                        "distribution": clean_text(row.get(col, "")),
                        "most_common": clean_text(row.get(most_col, "")),
                        "least_common": clean_text(row.get(least_col, "")),
                        "source_file": path.name,
                    }
                )
    return records


def main() -> None:
    OUT.mkdir(parents=True, exist_ok=True)
    p_claims, p_judgments, p_instances = load_pandora()
    m_claims, m_judgments, m_instances = load_mist()
    wvs = load_wvs_priors()

    claims = pd.DataFrame(p_claims + m_claims).drop_duplicates(["source", "claim_id"])
    judgments = pd.DataFrame(p_judgments + m_judgments)
    instances = pd.DataFrame(p_instances + m_instances)
    priors = pd.DataFrame(wvs)

    claims.to_csv(OUT / "claims.csv", index=False)
    judgments.to_csv(OUT / "judgments.csv", index=False)
    instances.to_csv(OUT / "evaluation_instances.csv", index=False)
    priors.to_csv(OUT / "wvs_group_priors.csv", index=False)

    summary = {
        "claims": len(claims),
        "judgments": len(judgments),
        "evaluation_instances": len(instances),
        "wvs_group_prior_rows": len(priors),
        "sources": {
            "PANDORA": {
                "claims": int((claims["source"] == "PANDORA").sum()) if not claims.empty else 0,
                "judgments": int((judgments["source"] == "PANDORA").sum()) if not judgments.empty else 0,
                "evaluation_instances": int((instances["source"] == "PANDORA").sum()) if not instances.empty else 0,
            },
            "MIST-1": {
                "claims": int((claims["source"] == "MIST-1").sum()) if not claims.empty else 0,
                "judgments": int((judgments["source"] == "MIST-1").sum()) if not judgments.empty else 0,
                "evaluation_instances": int((instances["source"] == "MIST-1").sum()) if not instances.empty else 0,
            },
        },
        "privacy": {
            "dropped": [
                "ResponseId",
                "PROLIFIC_ID",
                "IPAddress",
                "LocationLatitude",
                "LocationLongitude",
                "open-text notes/comments",
                "raw timestamps",
            ],
            "participant_ids": "deterministic salted SHA-256 hashes, truncated to 16 hex characters",
            "demographics": "broad gender, age bucket, education bucket, and living-area fields only",
        },
    }
    (OUT / "dataset_summary.json").write_text(json.dumps(summary, indent=2))
    print(json.dumps(summary, indent=2))


if __name__ == "__main__":
    main()