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from collections import Counter
from dataclasses import dataclass
from functools import lru_cache
import gzip
import json
from pathlib import Path
import random

from omegaconf import OmegaConf
from rich import print
from tqdm import tqdm

from refined_v4.data import atomic_json, signature
from . import data, envs


@dataclass
class Config:
    root: str = str(data.ROOT)
    tokenizer_samples: int = 256
    sampler_draws: int = 16000


def rows(path: Path):
    with gzip.open(path, 'rt') as stream:
        for line in stream:
            yield json.loads(line)


def audit(config: Config):
    root = Path(config.root)
    sources, source_audit = data.base_sources(data.Config(root=str(root)))
    styles = json.loads((root / 'styles.json').read_text())['styles']
    results = dict(revision=data.REVISION, source_exclusions=len(source_audit['exclusions']), stages={})
    for stage, budget in (('', 16777216), ('pilot-2m', 2097152)):
        folder = root / stage
        task_results = {}
        for task in data.TASKS:
            manifest = json.loads((folder / 'data' / task / 'manifest.json').read_text())
            groups = {}
            folds = {}
            for split in data.SPLITS:
                path = folder / manifest['splits'][split]['path']
                assert signature(path) == manifest['splits'][split]['sha256'], (task, split, 'checksum')
                folds[split] = list(rows(path))
                groups[split] = {row['group'] for row in folds[split]}
                assert len(groups[split]) == len(folds[split]), (task, split, 'duplicate source')
            for index, left in enumerate(data.SPLITS):
                for right in data.SPLITS[index + 1:]:
                    assert groups[left].isdisjoint(groups[right]), (task, left, right, 'leakage')
            by_id = {source['source_id']: source for source in sources[task]['sft']}

            @lru_cache(maxsize=200000)
            def expected(identity: str, style_id: int):
                source = by_id[identity]
                assert source['group'] in groups['sft'], (task, identity, 'non-SFT source')
                style = data.DEFAULT_STYLE if style_id == -1 else styles[style_id]
                row = data.make_row(task, source, style, style_id, include_hints=False)
                return envs.render(row), dict(source_id=identity, group=row['group'],
                    reference_sha256=data.digest(row['reference']), difficulty=source['difficulty'], style_id=style_id)

            sft = json.loads((folder / 'sft' / task / 'manifest.json').read_text())
            path = folder / sft['path']
            assert signature(path) == sft['sha256'], (task, 'SFT checksum')
            rng = random.Random(f'audit/{stage}/{task}')
            samples = set(rng.sample(range(sft['documents']), min(config.tokenizer_samples, sft['documents'])))
            budget_tokens = 0
            documents = 0
            examples = 0
            bands = Counter()
            for index, document in enumerate(tqdm(rows(path), total=sft['documents'],
                    desc=f'Audit {stage or "full"}/{task}', colour='cyan', mininterval=10)):
                declared = document['examples']
                assert 2 <= len(declared) <= 4
                assert len({row['group'] for row in declared}) == len(declared)
                rendered = [expected(row['source_id'], row['style_id']) for row in declared]
                assert declared == [value[1] for value in rendered], (task, index, 'metadata')
                assert document['text'] == '\n\n'.join(value[0] for value in rendered), (task, index, 'source mismatch')
                assert 0 < document['budget_tokens'] <= document['tokens'] <= 1024
                if index in samples or index == sft['documents'] - 1:
                    assert len(envs.ENC.encode_ordinary(document['text'])) == document['tokens']
                if index == 0:
                    demos = folds['rl'][0]['demonstrations']
                    assert [row['group'] for row in declared[:2]] == [row['group'] for row in demos]
                if index < sft['documents'] - 1:
                    assert document['budget_tokens'] == document['tokens']
                budget_tokens += document['budget_tokens']
                documents += 1
                examples += len(declared)
                bands.update(row['difficulty'] for row in declared)
            assert budget_tokens == sft['training_token_budget'] == budget
            assert documents == sft['documents'] and examples == sft['examples']
            assert dict(bands) == sft['difficulty_counts']
            pool = envs.Pool(folds['rl'])
            hints = Counter(pool.sample(rng).hint_level for _ in range(config.sampler_draws))
            expected_count = config.sampler_draws / 16
            assert all(abs(hints[level] - expected_count) < max(10, expected_count * .2) for level in range(1, 17))
            panel = envs.fixed_panel(folds['test'], 64, 2718)
            assert Counter(level for row, level in panel) == {level: 4 for level in range(1, 17)}
            for row, level in panel:
                item = envs.make_episode(row, level)
                assert envs.reward(item, item.completion) == 1.
            task_results[task] = dict(tokens=budget_tokens, documents=documents, examples=examples,
                source_reconstruction='Every SFT document exactly matches its immutable source and declared style',
                tokenized_documents=len(samples | {sft['documents'] - 1}),
                split_counts={split: len(values) for split, values in folds.items()},
                source_splits_disjoint=True, difficulty_counts=dict(bands),
                sampled_hint_counts=dict(hints), fixed_panel_gold_passes=64,
                sft_sha256=sft['sha256'])
            print(f'[green]{stage or "full"}/{task}: {budget_tokens:,} tokens; every document reconstructed[/green]')
        results['stages'][stage or 'full'] = task_results
    atomic_json(root / 'report-cache/data-audit.json', results)
    return results


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