# simord_hf_loader.py
# HF Datasets loader that uses mediqa-oe.data.process_data.attach_transcript_section
# to merge transcripts into local annotations: train, test1, test2.
#
# Dataset license: CDLA-2.0-permissive (for SIMORD). Respect upstream source licenses.
#
# Requirements:
#   pip install datasets nltk requests
#   pip install -e /path/to/mediqa-oe   # or add repo to PYTHONPATH
#
# Usage:
#   from datasets import load_dataset
#   ds = load_dataset(
#       "path/to/simord_hf_loader.py",
#       data_dir="path/to/annotations_dir",  # with train.json, test1.json, test2.json (lists of dicts)
#   )
#   print(ds)
#
# The loader will auto-download ACI-Bench and PriMock57 from GitHub to create transcript_dict.

import json
import os
import re
from typing import Dict, Iterable, List, Tuple

import datasets
import nltk

# Ensure sentence tokenizer needed by mediqa-oe code is available
try:
    nltk.data.find("tokenizers/punkt_tab")
except LookupError:
    nltk.download("punkt_tab")

# ---- Import the exact merge function from your repo ----
# (Relies on your local mediqa-oe being importable)
from mediqa_oe.data.process_data import attach_transcript_section  # noqa: E402

# ---- Sources (same as your script) ----
ACI_BENCH_URL = "https://github.com/wyim/aci-bench/archive/refs/heads/main.zip"
PRIMOCK_URL = "https://github.com/babylonhealth/primock57/archive/refs/heads/main.zip"

_DESCRIPTION = """\
SIMORD loader that merges transcripts from ACI-Bench and PriMock57 into local annotations
using mediqa-oe.data.process_data.attach_transcript_section.
"""
_CITATION = r"""@article{corbeil2025empowering,
  title={Empowering Healthcare Practitioners with Language Models: Structuring Speech Transcripts in Two Real-World Clinical Applications},
  author={Corbeil, Jean-Philippe and Ben Abacha, Asma and Michalopoulos, George and Swazinna, Patrick and Del-Agua, Miguel and Tremblay, Julien and Jeeson Daniel, Aju and Bader, Corey and Cho, Yoon-Chan and Krishnan, Parvathi and Bodenstab, Nathan and Lin, Tony and Teng, Wen and Beaulieu, Francois and Vozila, Paul},
  journal={arXiv preprint arXiv:2507.05517},
  year={2025}
}"""
_LICENSE = "CDLA-2.0-permissive"
_HOMEPAGE = "https://huggingface.co/datasets/<your-org>/SIMORD"

# ----------------------- helpers to read upstream transcripts -----------------------

def _walk_json_files(directory: str) -> List[str]:
    out = []
    for d, _, files in os.walk(directory):
        for fn in files:
            if fn.lower().endswith(".json"):
                out.append(os.path.join(d, fn))
    out.sort()
    return out

def _read_json_records(path: str) -> Iterable[dict]:
    with open(path, "r", encoding="utf-8") as f:
        data = json.load(f)
    if isinstance(data, dict) and "data" in data and isinstance(data["data"], list):
        for r in data["data"]:
            yield r
    elif isinstance(data, list):
        for r in data:
            yield r
    else:
        # single dict record
        yield data

def _normalize_id_from_aci(file_field: str, basename: str) -> str:
    # matches your script:
    # file_id = "_".join(d.get("file", "").split("-")[0:2])
    # transcript_id = "acibench_" + file_id + "_" + basename
    file_id = "_".join((file_field or "").split("-")[0:2])
    return f"acibench_{file_id}_{basename}"

def _build_aci_transcript_dict(root: str) -> Dict[str, dict]:
    """
    Mirror of read_aci_bench_data + walk_aci_bench_directory:
      looks in .../aci-bench-main/data/challenge_data_json and .../src_experiment_data_json
      and builds {transcript_id: {"transcript": <src_text>}}
    """
    tdict: Dict[str, dict] = {}
    base = None
    # Find the 'aci-bench-main' folder inside root
    for name in os.listdir(root):
        if name.startswith("aci-bench"):
            base = os.path.join(root, name)
            break
    if not base:
        return tdict

    for sub in ("data/challenge_data_json", "data/src_experiment_data_json"):
        p = os.path.join(base, sub)
        if not os.path.isdir(p):
            continue
        for fp in _walk_json_files(p):
            basename = os.path.splitext(os.path.basename(fp))[0]
            for rec in _read_json_records(fp):
                src = rec.get("src")
                file_field = rec.get("file", "")
                tid = _normalize_id_from_aci(file_field, basename)
                if src:
                    tdict[tid] = {"transcript": src}
    return tdict

def _read_text(path: str) -> str:
    with open(path, "r", encoding="utf-8") as f:
        return f.read()

def _normalize_primock_id(stem: str) -> str:
    # replicate replacements used in your script:
    # primock_id = filename.replace("day", "primock57_")
    # primock_id = primock_id.replace("consultation0", "")
    # primock_id = primock_id.replace("consultation", "")
    s = stem
    s = s.replace("day", "primock57_")
    s = s.replace("consultation0", "")
    s = s.replace("consultation", "")
    return s

def _build_primock_transcript_dict(root: str) -> Dict[str, dict]:
    """
    Mirror of read_primock_data post-conversion:
      reads *.txt in primock57-main/transcripts and applies the same tag normalization.
    """
    tdict: Dict[str, dict] = {}
    base = None
    for name in os.listdir(root):
        if name.startswith("primock57"):
            base = os.path.join(root, name)
            break
    if not base:
        return tdict

    tx_dir = os.path.join(base, "transcripts")
    if not os.path.isdir(tx_dir):
        # If transcripts haven't been generated yet by upstream script, we skip.
        return tdict

    for fn in os.listdir(tx_dir):
        if not fn.lower().endswith(".txt"):
            continue
        fp = os.path.join(tx_dir, fn)
        lines = [ln.strip() for ln in _read_text(fp).splitlines() if ln.strip()]
        norm = []
        for line in lines:
            line = line.replace("Doctor:", "[doctor]").replace("Patient:", "[patient]")
            norm.append(line)
        stem = os.path.splitext(fn)[0]
        primock_id = _normalize_primock_id(stem)
        tdict[primock_id] = {"transcript": "\n".join(norm)}
    return tdict

def _load_annotations(path: str) -> List[dict]:
    # Expect a JSON array (list of dicts). If JSONL, we also handle it gracefully.
    if path.lower().endswith((".jsonl", ".ndjson")):
        out = []
        with open(path, "r", encoding="utf-8") as f:
            for line in f:
                line = line.strip()
                if line:
                    out.append(json.loads(line))
        return out
    with open(path, "r", encoding="utf-8") as f:
        data = json.load(f)
    if isinstance(data, list):
        return data
    raise ValueError(f"{path} must be a JSON list (or JSONL).")

# ----------------------- HF builder -----------------------

class SimordMergeConfig(datasets.BuilderConfig):
    def __init__(self, **kwargs):
        super().__init__(version=datasets.Version("1.0.0"), **kwargs)

class SimordMerge(datasets.GeneratorBasedBuilder):
    BUILDER_CONFIGS = [
        SimordMergeConfig(
            name="default",
            description="SIMORD with transcripts merged via attach_transcript_section from mediqa-oe.",
        )
    ]
    DEFAULT_CONFIG_NAME = "default"

    def _info(self) -> datasets.DatasetInfo:
        # We expose a compact schema:
        # - id
        # - transcript: sequence of {turn_id, speaker, transcript}
        # - raw: JSON string dump of the full (possibly augmented) annotation record
        features = datasets.Features(
            {
                "id": datasets.Value("string"),
                "transcript": datasets.Sequence(
                    {
                        "turn_id": datasets.Value("int32"),
                        "speaker": datasets.Value("string"),
                        "transcript": datasets.Value("string"),
                    }
                ),
                "raw": datasets.Value("string"),
            }
        )
        return datasets.DatasetInfo(
            description=_DESCRIPTION,
            features=features,
            homepage=_HOMEPAGE,
            license=_LICENSE,
            citation=_CITATION,
        )

    def _split_generators(self, dl_manager: datasets.DownloadManager):
        data_dir = self.config.data_dir or os.getcwd()

        # Map from local file name → desired HF split name
        file_map = {
            "train.json": ("train", datasets.Split.TRAIN),
            "dev.json":   ("test1", "test1"),   # expose dev as "test1"
            "test.json":  ("test2", "test2"),   # expose test as "test2"
        }

        # Download upstream corpora once
        aci_dir = dl_manager.download_and_extract(ACI_BENCH_URL)
        primock_dir = dl_manager.download_and_extract(PRIMOCK_URL)
        self._transcript_dict = {}
        self._transcript_dict.update(_build_aci_transcript_dict(aci_dir))
        self._transcript_dict.update(_build_primock_transcript_dict(primock_dir))

        splits = []
        for fname, (exposed_name, hf_split) in file_map.items():
            path = os.path.join(data_dir, fname)
            if os.path.isfile(path):
                splits.append(
                    datasets.SplitGenerator(
                        name=hf_split,
                        gen_kwargs={"ann_path": path, "exposed_name": exposed_name},
                    )
                )
        return splits

    def _generate_examples(self, ann_path: str, exposed_name: str):
        section = _load_annotations(ann_path)
        attach_transcript_section(section, self._transcript_dict)
        for idx, rec in enumerate(section):
            rid = str(rec.get("id", idx))
            turns = rec.get("transcript") or []
            yield idx, {
                "id": rid,
                "split": exposed_name,         # optional field to carry which split it came from
                "transcript": turns,
                "raw": json.dumps(rec, ensure_ascii=False),
            }