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import ast
from collections import Counter
from concurrent.futures import ThreadPoolExecutor
from copy import deepcopy
from dataclasses import dataclass
import hashlib
import json
from pathlib import Path
import random
import re
import shutil

from huggingface_hub import hf_hub_download
from omegaconf import OmegaConf
import pyarrow.parquet as pq
from rich import print
from tqdm import tqdm

from functional_rl import v2
from hinted_rl.teacher_programs import canonical
from refined_v4.data import load_rows,write_rows,signature,atomic_json
from . import ROOT,TASKS
from .audit import authentic
from .data import annotate,documents,gold_passes
from .envs import Pool
from .named_data import styles_for

REPO='google-research-datasets/mbpp'
REVISION='4bb6404fdc6cacfda99d4ac4205087b89d32030c'


@dataclass
class Config:
    source: str=str(ROOT/'variants/consistent-natural-names-pilot-v1')
    root: str=str(ROOT/'variants/full-mbpp-seeds-pilot-v2')
    tokens: int=2097152
    benchmark_fraction: float=.5
    seed: int=6719
    workers: int=8


def native(raw: dict,task: str):
    question=raw['text'].strip()
    tree=ast.parse(raw['code'])
    functions=[n for n in tree.body if isinstance(n,ast.FunctionDef)]
    if len(functions)!=1 or any(not isinstance(n,(ast.Import,ast.ImportFrom,ast.FunctionDef)) for n in tree.body):
        raise ValueError('Require one standalone entry function and imports')
    setup=raw.get('test_setup_code') or ''
    setup_tree=ast.parse(setup)
    if any(not isinstance(n,(ast.Import,ast.ImportFrom)) for n in setup_tree.body):
        raise ValueError('Setup must contain imports only')
    tests=list(raw['test_list'])+list(raw.get('challenge_test_list') or [])
    if len(tests)<3 or not question:raise ValueError('Require instruction and three published tests')
    function=deepcopy(functions[0])
    if ast.get_docstring(function) is not None:function.body.pop(0)
    example=ast.parse(tests[0]).body
    if not example or not isinstance(example[0],ast.Assert):raise ValueError('Require assertion examples')
    expression=example[0].test
    documentation=question+'\n\nExample:\n    '+tests[0]
    if task.startswith('humaneval'):
        left,expected=ast.unparse(expression),'True'
        if isinstance(expression,ast.Compare) and len(expression.ops)==1 and isinstance(expression.ops[0],ast.Eq):
            try:
                expected=repr(ast.literal_eval(expression.comparators[0]));left=ast.unparse(expression.left)
            except (ValueError,TypeError):pass
        documentation=question+'\n\n>>> '+left+'\n'+expected
    if task.endswith('_docstring'):function.body.insert(0,ast.Expr(value=ast.Constant(value=documentation)))
    imports=[];seen=set()
    for node in setup_tree.body+[n for n in tree.body if isinstance(n,(ast.Import,ast.ImportFrom))]:
        key=ast.dump(node)
        if key not in seen:imports.append(deepcopy(node));seen.add(key)
    reference=ast.unparse(ast.fix_missing_locations(ast.Module(body=imports+[function],type_ignores=[])))
    if task=='humaneval':reference=''.join('# '+line+'\n' if line else '#\n' for line in documentation.splitlines())+reference
    identity=str(raw['task_id'])
    row=annotate(dict(task=task,source_id='mbpp-extra-'+identity,
        group=hashlib.sha256(('full-mbpp/'+identity).encode()).hexdigest(),question=question,
        reference=reference,answer=reference,tests=tests,setup=setup,
        provenance=dict(source=REPO,revision=REVISION,upstream_config='full',upstream_split=raw['upstream_split'],
            upstream_task_id=raw['task_id'],license='cc-by-4.0',sft_origin='additional_original_mbpp')))
    if len(v2.ENC.encode_ordinary(v2.render(row)))>850:raise ValueError('Too long for few-shot packing')
    return row


def build(config: Config):
    source,root=Path(config.source),Path(config.root)
    if (root/'dataset.json').exists():raise ValueError('Full-source dataset already frozen')
    cache=ROOT/'inputs/mbpp-full';sanitized=set();raw=[]
    for split in tqdm(('train','validation','test','prompt'),desc='Read pinned original MBPP files',colour='cyan'):
        def download(flavor):
            return hf_hub_download(REPO,flavor+'/'+split+'-00000-of-00001.parquet',repo_type='dataset',revision=REVISION,cache_dir=cache)
        sanitized.update(pq.read_table(download('sanitized'),columns=['task_id'])['task_id'].to_pylist())
        raw.extend(dict(row,upstream_split=split) for row in pq.read_table(download('full')).to_pylist())
    blocked=set();questions=set();known_ids=set();stats=Counter()
    verified=ROOT/'variants/verified-reference-pilot-v1'
    practice=ROOT/'variants/clear-practice-rl-v1'
    for task in tqdm(TASKS,desc='Index existing training and held-out solutions',colour='cyan'):
        for split in ('sft','rl','calibration','dev','test'):
            rows=load_rows(verified,task,split)
            if split=='rl':rows+=load_rows(practice,task,'rl')
            for row in rows:
                match=re.match(r'mbpp-(\d+)(?:\D|$)',row['source_id'])
                if match:known_ids.add(int(match.group(1)))
                blocked.add(canonical(row['reference']))
                if row['question']:questions.add(' '.join(row['question'].casefold().split()))
    for item in raw:
        if item['task_id'] not in sanitized|known_ids:continue
        questions.add(' '.join(item['text'].casefold().split()))
        try:blocked.add(canonical(item['code']))
        except (SyntaxError,ValueError):pass
        try:blocked.add(canonical(native(item,'mbpp')['reference']))
        except (SyntaxError,ValueError,TypeError,KeyError):pass
    candidates=[];seen=set(blocked)
    for item in tqdm(sorted(raw,key=lambda r:r['task_id']),desc='Exclude original IDs and known solutions',colour='cyan',mininterval=5):
        if item['task_id'] in sanitized:stats['original_sanitized_id']+=1;continue
        if item['task_id'] in known_ids:stats['existing_task_id']+=1;continue
        if ' '.join(item['text'].casefold().split()) in questions:stats['known_question']+=1;continue
        try:
            row=native(item,'mbpp');keys={canonical(item['code']),canonical(row['reference'])}
            if keys&seen:stats['known_solution']+=1;continue
            native_rows={task:native(item,task) for task in TASKS}
        except (ValueError,SyntaxError,TypeError,KeyError):stats['format_or_context']+=1;continue
        seen.update(keys);candidates.append((item,native_rows))
    with ThreadPoolExecutor(max_workers=config.workers) as pool:
        passed=list(tqdm(pool.map(gold_passes,[rows['mbpp'] for item,rows in candidates]),total=len(candidates),
                         desc='Check additional published MBPP tests once',colour='green',mininterval=5))
    accepted=[item for item,ok in zip(candidates,passed,strict=True) if ok]
    stats['published_test_failure']=len(candidates)-len(accepted)
    if len(accepted)<100:raise ValueError('Insufficient additional original problems')
    is_rl=lambda item:int(hashlib.sha256(f'{config.seed}/{item["task_id"]}'.encode()).hexdigest()[:8],16)%5==0
    report=json.loads((source/'dataset.json').read_text())
    report.update(revision='full-mbpp-seeds-v2',source=str(source),sft_tokens=config.tokens,seed=config.seed,
        benchmark_draw_probability=config.benchmark_fraction,upstream=dict(repo=REPO,revision=REVISION,license='cc-by-4.0'),
        extra_source_filtering=dict(stats),extra_sft_ids=[item['task_id'] for item,rows in accepted if not is_rl(item)],
        extra_rl_ids=[item['task_id'] for item,rows in accepted if is_rl(item)],
        extra_source_policy='Additional original full-MBPP problems only. Exclude EVERY original sanitized task ID and every known existing upstream task ID. Also exclude original RAW upstream solutions/questions for those IDs, alongside current rewritten references. Deterministic80/20 SFT/RL split. Every admitted reference passes its published tests. No rewritten expected values.',
        sft_policy='Sample body band from ORIGINAL authentic SFT-training frequencies, then source origin at the declared benchmark fraction, then source group, then a natural local-name variant. Two to four complete native examples per document.',
        rl_policy='Uniform missing length1..16 first, then uniform original-benchmark/additional-MBPP origin, then eligible source. No synthetic practice contracts in this variant. Calibration/development/test stay byte-identical.')
    for task in TASKS:
        shutil.copytree(source/'data'/task,root/'data'/task,dirs_exist_ok=True)
        rows=load_rows(source,task,'sft')
        old_auth={r['group']:r for r in load_rows(verified,task,'sft') if authentic(r)}
        bands=Counter(r['provenance']['difficulty'] for r in old_auth.values())
        weights={band:count/sum(bands.values()) for band,count in bands.items()}
        original=load_rows(verified,task,'rl')
        rl=[dict(row,sampling_origin='benchmark') for row in original]
        for item,native_rows in tqdm(accepted,desc=task+' original-source styles',colour='cyan',mininterval=5):
            row=native_rows[task]
            if is_rl(item):
                try:rl.append(annotate(dict(row,demonstrations=original[0]['demonstrations'],sampling_origin='full_mbpp')))
                except ValueError:stats['rl_context_rejected']+=1
            else:
                variants,filtered=styles_for(row,4,config.seed);rows.extend(variants)
        assert not {r['group'] for r in rows}&{r['group'] for r in rl}
        Pool(rl)
        write_rows(root/'data'/task/'sft.jsonl.gz',rows);write_rows(root/'data'/task/'rl.jsonl.gz',rl)
        corpus=documents(rows,config.tokens,random.Random(config.seed),config.benchmark_fraction,True,weights)
        target=root/'sft'/task/'train.jsonl.gz';write_rows(target,corpus)
        info=report['tasks'][task]
        info.update(rows=dict(info['rows'],sft=len(rows),rl=len(rl)),documents=len(corpus),sft_sha256=signature(target),
            source_groups=len({r['group'] for r in rows}),sft_body_band_target=weights,
            admitted_extra_rl_ids=[r['provenance']['upstream_task_id'] for r in rl if r['sampling_origin']=='full_mbpp'],
            unique_sft_programs_used=len({r['source_id'] for doc in corpus for r in doc['examples']}),
            document_example_counts=dict(Counter(len(d['examples']) for d in corpus)))
        for fold in ('sft','rl'):
            relative='data/'+task+'/'+fold+'.jsonl.gz';info['assets'][relative]=signature(root/relative)
            pool_rows=rows if fold=='sft' else rl
            info.setdefault('hint_coverage',{})[fold]={str(n):sum(n in r['hint_levels'] for r in pool_rows) for n in range(1,17)}
        for fold in ('calibration','dev','test'):
            assert signature(root/'data'/task/(fold+'.jsonl.gz'))==signature(source/'data'/task/(fold+'.jsonl.gz'))
        atomic_json(root/'build-progress.json',report)
    report['extra_source_filtering']=dict(stats)
    atomic_json(root/'dataset.json',report)
    print('[green]Additional original MBPP SFT/RL sources ready[/green]',len(report['extra_sft_ids']),len(report['extra_rl_ids']),flush=True)


if __name__=='__main__':
    build(OmegaConf.to_object(OmegaConf.merge(OmegaConf.structured(Config),OmegaConf.from_cli())))