#!/usr/bin/env python3
"""
pubs_join.py — shared join logic for the CMIP6 publications corpus.

Builds a per-paper index from the archive + join sources:
  - canonical DOI  (doi_lookup.json map; heuristic fallback, flagged)
  - has_local_md + reused domains from pubs_rag/out/papers.jsonl
  - domain heuristic (build_corpus classifier) for the rest
  - registry link (orphan / linked_products) by canonical lowercase DOI

Used by load_pubs_qdrant.py (loading) and standalone (join-quality report).
"""
import json
import sys
from collections import Counter
from pathlib import Path

ROOT = Path(__file__).resolve().parent
# Copernicus corpus (12,411 papers / 430,066 chunks) — NOT the old cmip6 archive.
ARCHIVE = ROOT / "out" / "chunks_embedded.jsonl"
DOI_MAP = Path("/Users/dmpantiu/cmip6/cmip6_gpt/rag/doi_lookup.json")  # legacy fallback only
PAPERS = ROOT / "out" / "papers.jsonl"
REGISTRY = Path("/Users/dmpantiu/copernicus_mcp/publications/registry/publications.jsonl")

# ── Domain keyword classifier (copied from build_corpus.py) ──────────────────
DOMAIN_KEYWORDS = {
    "ocean/marine": [
        "ocean", "marine", "sea surface", "sst", "salinity", "sea level",
        "amoc", "overturning", "thermocline", "gyre", "enso", "el nino",
        "el niño", "la nina", "la niña", "sea-surface", "oceanic", "coral",
        "phytoplankton", "biogeochem", "seawater", "coastal", "estuar",
        "upwelling", "meridional overturning", "ocean heat", "mixed layer",
        "benthic", "fisher", "chlorophyll", "carbon uptake", "gulf stream",
    ],
    "atmosphere": [
        "atmospher", "precipitation", "rainfall", "monsoon", "aerosol",
        "cloud", "troposphere", "stratosphere", "wind", "circulation",
        "geopotential", "ozone", "humidity", "water vapor", "water vapour",
        "convection", "jet stream", "storm track", "cyclone", "hurricane",
        "typhoon", "radiative forcing", "temperature extremes", "heat wave",
        "heatwave", "annular mode", "teleconnection", "air quality",
        "greenhouse gas", "methane", "co2", "emission",
    ],
    "cryosphere": [
        "sea ice", "sea-ice", "ice sheet", "ice-sheet", "glacier", "snow",
        "permafrost", "cryospher", "antarctic", "arctic", "greenland",
        "albedo", "ice shelf", "iceberg", "melt", "frozen", "snowpack",
    ],
    "land": [
        "soil", "vegetation", "land surface", "land-surface", "terrestrial",
        "crop", "agricultur", "forest", "drought", "runoff", "hydrolog",
        "river", "streamflow", "evapotranspiration", "biosphere", "land use",
        "land-use", "wildfire", "biomass", "ecosystem", "groundwater",
        "watershed", "vegetation dynamics",
    ],
    "climate-modeling": [
        "cmip", "gcm", "esm", "earth system model", "coupled model",
        "model intercomparison", "climate model", "simulation", "downscaling",
        "bias correction", "parameteriz", "parameteris", "ensemble",
        "reanalysis", "emulator", "scenariomip", "ssp", "rcp",
        "climate projection", "hindcast", "climate sensitivity",
        "detection and attribution", "resolution", "spin-up", "spinup",
    ],
    "emergency": [
        "disaster", "flood risk", "flooding", "emergency", "hazard",
        "early warning", "risk assessment", "vulnerabilit", "adaptation",
        "extreme event", "damage", "impact assessment", "resilience",
        "mortality", "compound risk", "catastroph",
    ],
}
DEFAULT_DOMAIN = "climate-general"


def classify(title: str, journal: str) -> list[str]:
    hay = f"{title} {journal}".lower()
    tags = [dom for dom, kws in DOMAIN_KEYWORDS.items() if any(kw in hay for kw in kws)]
    return tags or [DEFAULT_DOMAIN]


def canonical_doi(paper_id: str, doi_field: str, doi_map: dict):
    """Return (canonical_doi, source) where source in {chunk, map, local, heuristic}."""
    # New corpus: chunks carry the registry-resolved DOI — trust it when canonical.
    if doi_field.startswith("10.") and "/" in doi_field:
        return doi_field, "chunk"
    key = paper_id or doi_field
    if key in doi_map:
        return doi_map[key], "map"
    if doi_field in doi_map:
        return doi_map[doi_field], "map"
    # heuristic: first "_" -> ".", second "_" -> "/", rest of tail keep as-is
    parts = key.split("_", 2)
    if len(parts) >= 3 and parts[0] == "10":
        return f"10.{parts[1]}/{parts[2]}", "heuristic"
    return key.replace("_", "/"), "heuristic"


def load_doi_map() -> dict:
    if not DOI_MAP.exists():
        return {}
    return json.loads(DOI_MAP.read_text())


def load_local_papers() -> dict:
    """paper_id -> {domains, md_path} for the locally parsed set."""
    out = {}
    if not PAPERS.exists():
        return out
    with open(PAPERS, encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            r = json.loads(line)
            out[r["paper_id"]] = r
    return out


def load_registry() -> dict:
    """canonical DOI (lowercase) -> registry record."""
    reg = {}
    if not REGISTRY.exists():
        return reg
    with open(REGISTRY, encoding="utf-8") as f:
        for line in f:
            line = line.strip()
            if not line:
                continue
            try:
                r = json.loads(line)
            except Exception:
                continue
            doi = str(r.get("doi", "")).lower().strip()
            if doi:
                reg[doi] = r
    return reg


def build_paper_index(log=print):
    """One streaming pass over the archive header fields to build a per-paper
    index. Returns (index, stats). index[paper_id] = {
      doi, doi_source, domains, has_local_md, orphan, linked_products, n_chunks }.
    """
    doi_map = load_doi_map()
    local = load_local_papers()
    reg = load_registry()
    log(f"sources: doi_map={len(doi_map)} local_papers={len(local)} registry={len(reg)}")

    index = {}
    n_chunks = 0
    with open(ARCHIVE, encoding="utf-8") as f:
        for line in f:
            n_chunks += 1
            c = json.loads(line)
            pid = c["paper_id"]
            if pid in index:
                index[pid]["n_chunks"] += 1
                continue
            doi_field = str(c.get("doi", ""))
            doi, source = canonical_doi(pid, doi_field, doi_map)
            doi_lc = doi.lower().strip()
            lp = local.get(pid)
            if lp is not None:
                domains = lp.get("domains") or classify(c.get("title", ""), c.get("journal", ""))
                has_local = True
            else:
                domains = classify(c.get("title", ""), c.get("journal", ""))
                has_local = False
            r = reg.get(doi_lc)
            if r is not None:
                orphan = bool(r.get("orphan", False))
                linked = r.get("linked_products", []) or []
            else:
                orphan = True
                linked = []
            index[pid] = {
                "doi": doi, "doi_source": source, "domains": domains,
                "has_local_md": has_local, "orphan": orphan,
                "linked_products": linked, "n_chunks": 1,
            }
    stats = compute_stats(index, n_chunks)
    return index, stats


def compute_stats(index: dict, n_chunks: int) -> dict:
    src_papers = Counter()
    src_chunks = Counter()
    dom_papers = Counter()
    dom_chunks = Counter()
    local_papers = local_chunks = 0
    linked_papers = linked_chunks = 0
    for pid, m in index.items():
        nc = m["n_chunks"]
        src_papers[m["doi_source"]] += 1
        src_chunks[m["doi_source"]] += nc
        for d in m["domains"]:
            dom_papers[d] += 1
            dom_chunks[d] += nc
        if m["has_local_md"]:
            local_papers += 1
            local_chunks += nc
        if not m["orphan"] or m["linked_products"]:
            linked_papers += 1
            linked_chunks += nc
    return {
        "n_papers": len(index), "n_chunks": n_chunks,
        "src_papers": src_papers, "src_chunks": src_chunks,
        "dom_papers": dom_papers, "dom_chunks": dom_chunks,
        "local_papers": local_papers, "local_chunks": local_chunks,
        "linked_papers": linked_papers, "linked_chunks": linked_chunks,
    }


def print_report(stats: dict):
    P, C = stats["n_papers"], stats["n_chunks"]
    print(f"\n=== JOIN QUALITY REPORT ===")
    print(f"papers: {P:,}   chunks: {C:,}")
    print("\nDOI canonicalization source (papers / chunks):")
    for s in ("chunk", "map", "heuristic", "local"):
        pp, cc = stats["src_papers"].get(s, 0), stats["src_chunks"].get(s, 0)
        print(f"  {s:10s} papers {pp:5d} ({100*pp/P:5.1f}%)   chunks {cc:7,d} ({100*cc/C:5.1f}%)")
    print("  (unresolved = heuristic that produced a non-DOI-looking string — see flag below)")
    print(f"\nlocal parsed md (has_local_md=true): papers {stats['local_papers']:,} "
          f"chunks {stats['local_chunks']:,}")
    print(f"registry-linked (orphan=false / linked_products): papers {stats['linked_papers']:,} "
          f"chunks {stats['linked_chunks']:,}")
    print("\ndomain distribution (multi-label):")
    for d, n in stats["dom_papers"].most_common():
        print(f"  {d:18s} papers {n:5d}   chunks {stats['dom_chunks'][d]:7,d}")


if __name__ == "__main__":
    idx, stats = build_paper_index()
    print_report(stats)
    # flag heuristic DOIs that don't look canonical
    bad = [(pid, m["doi"]) for pid, m in idx.items()
           if m["doi_source"] == "heuristic" and not m["doi"].startswith("10.")]
    print(f"\nheuristic DOIs NOT starting with '10.': {len(bad)}")
    for pid, doi in bad[:20]:
        print(f"  {pid} -> {doi}", file=sys.stderr)