"""
TempBench — Wikidata Label Resolver
=======================================
Converts Wikidata QIDs and PIDs in benchmark JSONL files into human-readable
English labels, turning machine-generated questions like:

    "Q230104's P17 in 1929 was?"

into:

    "What country was Poland in 1929?"  (after full template rewrite)
    or at minimum: "Danzig's country in 1929 was?"

Two modes:
  1. API mode (default): fetches labels from Wikidata REST API in batches of 50.
     Requires internet access; rate-limited politely (~1 req/s).
  2. Dump mode (--label_dump): reads from a pre-downloaded TSV label file
     (format: QID<TAB>label<TAB>description, one per line).
     Faster and offline — use this for production runs.

Label dump can be produced via:
    python resolve_labels.py --collect_ids benchmark.jsonl --id_output ids.txt
    # then on a machine with internet:
    python resolve_labels.py --fetch_dump ids.txt --dump_output labels.tsv
    # then resolve:
    python resolve_labels.py --input benchmark.jsonl --label_dump labels.tsv --output benchmark_labelled.jsonl

Usage (quick / API mode):
    python resolve_labels.py --input benchmark.jsonl --output benchmark_labelled.jsonl

Usage (offline / dump mode):
    python resolve_labels.py --input benchmark.jsonl --label_dump labels.tsv --output benchmark_labelled.jsonl
"""

from __future__ import annotations

import argparse
import json
import re
import sys
import time
from pathlib import Path
from typing import Dict, List, Optional, Set
try:
    import urllib.request
    import urllib.error
except ImportError:
    pass


# ---------------------------------------------------------------------------
# Wikidata API label fetcher
# ---------------------------------------------------------------------------

WIKIDATA_API = "https://www.wikidata.org/w/api.php"
BATCH_SIZE   = 50       # Wikidata allows up to 50 IDs per wbgetentities call
RETRY_LIMIT  = 3
SLEEP_BETWEEN_BATCHES = 0.5  # seconds — polite rate limiting


def fetch_labels_api(ids: List[str], lang: str = "en") -> Dict[str, str]:
    """
    Fetch English labels for a list of Wikidata IDs (Q-IDs and P-IDs) via API.
    Returns a dict {id: label}. Missing IDs get empty string.
    """
    labels: Dict[str, str] = {}

    for i in range(0, len(ids), BATCH_SIZE):
        batch = ids[i : i + BATCH_SIZE]
        ids_str = "|".join(batch)

        url = (
            f"{WIKIDATA_API}?action=wbgetentities"
            f"&ids={ids_str}"
            f"&props=labels"
            f"&languages={lang}"
            f"&format=json"
        )

        for attempt in range(RETRY_LIMIT):
            try:
                req = urllib.request.Request(
                    url,
                    headers={"User-Agent": "TempBench/1.0 (research; label resolver)"},
                )
                with urllib.request.urlopen(req, timeout=15) as resp:
                    data = json.loads(resp.read().decode("utf-8"))

                for qid, entity in data.get("entities", {}).items():
                    lab = entity.get("labels", {}).get(lang, {}).get("value", "")
                    labels[qid] = lab

                break  # success

            except Exception as e:
                if attempt < RETRY_LIMIT - 1:
                    time.sleep(2 ** attempt)
                else:
                    print(f"[Warning] API fetch failed for batch {i//BATCH_SIZE}: {e}", file=sys.stderr)

        time.sleep(SLEEP_BETWEEN_BATCHES)
        print(f"  Fetched {min(i + BATCH_SIZE, len(ids))}/{len(ids)} labels...", end="\r", flush=True)

    print()
    return labels


# ---------------------------------------------------------------------------
# Dump-based label loader (offline mode)
# ---------------------------------------------------------------------------

def load_label_dump(dump_path: str) -> Dict[str, str]:
    """
    Load a TSV label dump: QID<TAB>label  (one entity per line).
    Lines starting with # are comments.
    """
    labels: Dict[str, str] = {}
    with open(dump_path, "r", encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line or line.startswith("#"):
                continue
            parts = line.split("\t", 2)
            if len(parts) >= 2:
                labels[parts[0]] = parts[1]
    print(f"[LabelDump] Loaded {len(labels):,} labels from {dump_path}")
    return labels


def save_label_dump(labels: Dict[str, str], output_path: str) -> None:
    """Save fetched labels to a TSV dump for offline re-use."""
    with open(output_path, "w", encoding="utf-8") as f:
        f.write("# Wikidata label dump for TempBench\n")
        f.write("# Format: QID<TAB>label\n")
        for qid, label in sorted(labels.items()):
            f.write(f"{qid}\t{label}\n")
    print(f"[LabelDump] Saved {len(labels):,} labels to {output_path}")


# ---------------------------------------------------------------------------
# ID extraction
# ---------------------------------------------------------------------------

QID_PATTERN = re.compile(r'\b(Q\d+|P\d+)\b')


def extract_ids_from_jsonl(path: str) -> Set[str]:
    """Extract all unique Wikidata QIDs and PIDs from a benchmark JSONL."""
    ids: Set[str] = set()
    with open(path, "r", encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            ids.update(QID_PATTERN.findall(line))
    return ids


# ---------------------------------------------------------------------------
# Question rewriter
# ---------------------------------------------------------------------------

RELATION_TEMPLATES: Dict[str, str] = {
    # Standard Wikidata properties → natural language verbs/phrases
    "P17":    "country",
    "P19":    "place of birth",
    "P20":    "place of death",
    "P21":    "sex or gender",
    "P22":    "father",
    "P25":    "mother",
    "P26":    "spouse",
    "P27":    "country of citizenship",
    "P39":    "position held",
    "P40":    "child",
    "P50":    "author",
    "P57":    "director",
    "P131":   "located in",
    "P136":   "genre",
    "P155":   "follows",
    "P156":   "followed by",
    "P159":   "headquarters",
    "P166":   "award received",
    "P175":   "performer",
    "P176":   "manufacturer",
    "P178":   "developer",
    "P184":   "doctoral advisor",
    "P185":   "doctoral student",
    "P190":   "twinned with",
    "P276":   "location",
    "P286":   "head coach",
    "P355":   "subsidiary",
    "P361":   "part of",
    "P413":   "position played",
    "P452":   "industry",
    "P488":   "chairperson",
    "P495":   "country of origin",
    "P527":   "has part",
    "P571":   "inception",
    "P576":   "dissolved",
    "P577":   "publication date",
    "P580":   "start time",
    "P582":   "end time",
    "P598":   "commander",
    "P607":   "conflict",
    "P664":   "organizer",
    "P710":   "participant",
    "P737":   "influenced by",
    "P749":   "parent organization",
    "P800":   "notable work",
    "P921":   "main subject",
    "P1037":  "manager",
    "P1308":  "officeholder",
    "P2632":  "point in time",
    "P3342":  "significant person",
}


class LabelApplier:
    """
    Applies resolved labels to benchmark questions and subgraphs.
    Replaces QIDs/PIDs in-place and rewrites question text.
    """

    def __init__(self, labels: Dict[str, str]):
        self.labels = labels

    def resolve(self, qid: str) -> str:
        """Return human-readable label for a QID/PID, falling back to the raw ID."""
        label = self.labels.get(qid, "")
        return label if label else qid

    def resolve_relation(self, pid: str) -> str:
        """Return a natural-language relation phrase, using RELATION_TEMPLATES first."""
        if pid in RELATION_TEMPLATES:
            return RELATION_TEMPLATES[pid]
        # Fallback to fetched label
        label = self.labels.get(pid, "")
        return label if label else pid

    def rewrite_question(self, question: str, t_query: float) -> str:
        """
        Rewrite a machine-generated question by substituting labels for QIDs/PIDs.
        Also rewrites common template patterns for naturalness.
        """
        # Step 1: find all QIDs/PIDs in the question
        qids = QID_PATTERN.findall(question)
        substituted = question
        for qid in qids:
            if re.match(r'^P\d+$', qid):
                substituted = substituted.replace(qid, self.resolve_relation(qid))
            else:
                substituted = substituted.replace(qid, self.resolve(qid))

        # Step 2: rewrite common template patterns
        # Pattern: "X's RELATION in YEAR was?"  →  "What was X's RELATION in YEAR?"
        m = re.match(r"^(.+)'s (.+) in (\d{4}) was\?$", substituted)
        if m:
            subj, rel, year = m.group(1), m.group(2), m.group(3)
            substituted = f"What was {subj}'s {rel} in {year}?"

        # Pattern: "Who was the RELATION of ENTITY in YEAR?"  →  keep as-is (already natural)
        # Pattern: "Who was the RELATION of ENTITY before OTHER?"  →  keep as-is

        return substituted

    def rewrite_triple(self, triple: dict) -> dict:
        """Apply labels to a single triple dict {s, r, o, t_start, t_end}."""
        return {
            **triple,
            "s":        self.resolve(triple["s"]),
            "s_id":     triple["s"],
            "r":        self.resolve_relation(triple["r"]),
            "r_id":     triple["r"],
            "o":        self.resolve(triple["o"]),
            "o_id":     triple["o"],
        }

    def rewrite_question_record(self, record: dict) -> dict:
        """Apply labels to all fields of a benchmark question record."""
        out = dict(record)

        out["answer_raw"]   = record["answer"]
        out["answer"]       = self.resolve(record["answer"])
        out["question_raw"] = record["question"]
        out["question"]     = self.rewrite_question(record["question"], record["t_query"])

        for field in ("S_star", "S_dist", "S_stale"):
            if field in record and record[field]:
                out[field] = [self.rewrite_triple(t) for t in record[field]]

        return out


# ---------------------------------------------------------------------------
# Main pipeline
# ---------------------------------------------------------------------------

def resolve_benchmark(
    input_path: str,
    output_path: str,
    label_dump: Optional[str] = None,
    lang: str = "en",
    save_dump: Optional[str] = None,
) -> None:
    """
    Full label resolution pipeline for a benchmark JSONL file.
    """
    print(f"[Resolver] Input: {input_path}")

    # Step 1: extract all IDs
    print("[Step 1] Extracting Wikidata IDs...")
    ids = extract_ids_from_jsonl(input_path)
    print(f"  Found {len(ids):,} unique IDs (Q-IDs + P-IDs)")

    # Step 2: load or fetch labels
    if label_dump and Path(label_dump).exists():
        labels = load_label_dump(label_dump)
        # Fetch any IDs missing from the dump
        missing = [qid for qid in ids if qid not in labels]
        if missing:
            print(f"[Step 2] Fetching {len(missing):,} labels missing from dump via API...")
            fetched = fetch_labels_api(missing, lang=lang)
            labels.update(fetched)
    else:
        print(f"[Step 2] Fetching {len(ids):,} labels from Wikidata API...")
        labels = fetch_labels_api(sorted(ids), lang=lang)

    if save_dump:
        save_label_dump(labels, save_dump)

    # Coverage report
    resolved   = sum(1 for qid in ids if labels.get(qid, ""))
    unresolved = [qid for qid in ids if not labels.get(qid, "")]
    print(f"  Label coverage: {resolved}/{len(ids)} ({100*resolved/max(len(ids),1):.1f}%)")
    if unresolved:
        print(f"  Unresolved IDs (using raw): {unresolved[:10]}{'...' if len(unresolved)>10 else ''}")

    # Step 3: apply labels to all records
    print("[Step 3] Applying labels to benchmark records...")
    applier = LabelApplier(labels)
    out_path = Path(output_path)
    out_path.parent.mkdir(parents=True, exist_ok=True)

    n_written = 0
    with open(input_path, "r", encoding="utf-8") as fin, \
         open(output_path, "w", encoding="utf-8") as fout:
        for line in fin:
            line = line.strip()
            if not line:
                continue
            record = json.loads(line)
            resolved_record = applier.rewrite_question_record(record)
            fout.write(json.dumps(resolved_record, ensure_ascii=False) + "\n")
            n_written += 1

    print(f"[Resolver] Done — {n_written:,} records written to {output_path}")


# ---------------------------------------------------------------------------
# CLI
# ---------------------------------------------------------------------------

def main():
    parser = argparse.ArgumentParser(
        description="Resolve Wikidata QIDs/PIDs in TempBench benchmark JSONL to human-readable labels."
    )
    parser.add_argument("--input",        required=False, help="Input benchmark JSONL path")
    parser.add_argument("--output",       required=False, help="Output labelled JSONL path")
    parser.add_argument("--label_dump",   default=None,  help="Path to pre-fetched TSV label dump (QID<TAB>label)")
    parser.add_argument("--save_dump",    default=None,  help="Save fetched labels to this TSV file for reuse")
    parser.add_argument("--lang",         default="en",  help="Wikidata label language (default: en)")
    parser.add_argument("--collect_ids",  default=None,  help="Only collect IDs from JSONL and write to --id_output")
    parser.add_argument("--id_output",    default="ids.txt", help="Output file for collected IDs")
    parser.add_argument("--fetch_dump",   default=None,  help="Fetch labels for IDs in this file and save to --dump_output")
    parser.add_argument("--dump_output",  default="labels.tsv", help="Output file for fetched label dump")

    args = parser.parse_args()

    # Mode 1: just collect IDs
    if args.collect_ids:
        ids = extract_ids_from_jsonl(args.collect_ids)
        with open(args.id_output, "w") as f:
            for qid in sorted(ids):
                f.write(qid + "\n")
        print(f"[ID Collector] {len(ids):,} unique IDs written to {args.id_output}")
        return

    # Mode 2: fetch dump from ID list
    if args.fetch_dump:
        with open(args.fetch_dump) as f:
            ids = [line.strip() for line in f if line.strip() and not line.startswith("#")]
        print(f"[DumpFetcher] Fetching labels for {len(ids):,} IDs...")
        labels = fetch_labels_api(ids, lang=args.lang)
        save_label_dump(labels, args.dump_output)
        return

    # Mode 3: full resolution
    if not args.input or not args.output:
        parser.error("--input and --output are required for label resolution")

    resolve_benchmark(
        input_path=args.input,
        output_path=args.output,
        label_dump=args.label_dump,
        lang=args.lang,
        save_dump=args.save_dump,
    )


if __name__ == "__main__":
    main()