"""
data_setup.py — Download, preprocess, audit, and prepare all datasets for
CodonFM-80M mRNA stability fine-tuning and benchmarking.

Usage:
    # Download and preprocess everything
    python data_setup.py --all

    # Download only training datasets
    python data_setup.py --training

    # Download only benchmark datasets
    python data_setup.py --benchmark

    # Audit datasets (inspect stats, find issues)
    python data_setup.py --audit

    # Export preprocessed training data to local files
    python data_setup.py --training --export ./processed_data

    # Show codon vocabulary and tokenizer details
    python data_setup.py --vocab
"""

import argparse
import json
import os
import sys
import csv
import urllib.request
from collections import Counter
from pathlib import Path

import numpy as np

try:
    import pandas as pd
except ImportError:
    pd = None

try:
    from datasets import load_dataset
except ImportError:
    load_dataset = None


# ============================================================
# 1. CODON VOCABULARY & TOKENIZER
# ============================================================

RNA_BASES = ['A', 'U', 'G', 'C']
ALL_CODONS = [b1 + b2 + b3 for b1 in RNA_BASES for b2 in RNA_BASES for b3 in RNA_BASES]

# Biological codon table (RNA) → Amino Acid
CODON_TABLE = {
    'UUU': 'Phe', 'UUC': 'Phe', 'UUA': 'Leu', 'UUG': 'Leu',
    'CUU': 'Leu', 'CUC': 'Leu', 'CUA': 'Leu', 'CUG': 'Leu',
    'AUU': 'Ile', 'AUC': 'Ile', 'AUA': 'Ile', 'AUG': 'Met/Start',
    'GUU': 'Val', 'GUC': 'Val', 'GUA': 'Val', 'GUG': 'Val',
    'UCU': 'Ser', 'UCC': 'Ser', 'UCA': 'Ser', 'UCG': 'Ser',
    'CCU': 'Pro', 'CCC': 'Pro', 'CCA': 'Pro', 'CCG': 'Pro',
    'ACU': 'Thr', 'ACC': 'Thr', 'ACA': 'Thr', 'ACG': 'Thr',
    'GCU': 'Ala', 'GCC': 'Ala', 'GCA': 'Ala', 'GCG': 'Ala',
    'UAU': 'Tyr', 'UAC': 'Tyr', 'UAA': 'Stop', 'UAG': 'Stop',
    'CAU': 'His', 'CAC': 'His', 'CAA': 'Gln', 'CAG': 'Gln',
    'AAU': 'Asn', 'AAC': 'Asn', 'AAA': 'Lys', 'AAG': 'Lys',
    'GAU': 'Asp', 'GAC': 'Asp', 'GAA': 'Glu', 'GAG': 'Glu',
    'UGU': 'Cys', 'UGC': 'Cys', 'UGA': 'Stop', 'UGG': 'Trp',
    'CGU': 'Arg', 'CGC': 'Arg', 'CGA': 'Arg', 'CGG': 'Arg',
    'AGU': 'Ser', 'AGC': 'Ser', 'AGA': 'Arg', 'AGG': 'Arg',
    'GGU': 'Gly', 'GGC': 'Gly', 'GGA': 'Gly', 'GGG': 'Gly',
}

# Token vocabulary (matches CodonFM config: vocab_size=69, pad_token_id=3)
SPECIAL_TOKENS = {'[CLS]': 0, '[SEP]': 1, '[MASK]': 2, '[PAD]': 3, '[UNK]': 4}
CODON_TO_ID = {codon: i + 5 for i, codon in enumerate(ALL_CODONS)}
ID_TO_CODON = {v: k for k, v in CODON_TO_ID.items()}
ID_TO_CODON.update({v: k for k, v in SPECIAL_TOKENS.items()})

VOCAB_SIZE = len(SPECIAL_TOKENS) + len(ALL_CODONS)  # 5 + 64 = 69
assert VOCAB_SIZE == 69

PAD_TOKEN_ID = 3
CLS_TOKEN_ID = 0
SEP_TOKEN_ID = 1
MASK_TOKEN_ID = 2
UNK_TOKEN_ID = 4


def seq_to_codons(seq: str) -> list:
    """Split an mRNA/DNA sequence into codon triplets."""
    seq = seq.upper().replace('T', 'U').strip()
    return [seq[i:i+3] for i in range(0, len(seq) - len(seq) % 3, 3)]


def tokenize_mRNA(seq: str, max_length: int = 2046) -> dict:
    """Tokenize an mRNA/DNA sequence into CodonFM token IDs."""
    codons = seq_to_codons(seq)
    token_ids = [CLS_TOKEN_ID]
    for codon in codons[:max_length - 2]:
        token_ids.append(CODON_TO_ID.get(codon, UNK_TOKEN_ID))
    token_ids.append(SEP_TOKEN_ID)
    attention_mask = [1] * len(token_ids)
    return {'input_ids': token_ids, 'attention_mask': attention_mask}


def validate_sequence(seq: str) -> dict:
    """Validate an mRNA/DNA sequence for CodonFM compatibility."""
    seq_clean = seq.upper().replace('T', 'U').strip()
    issues = []

    if len(seq_clean) == 0:
        issues.append("Empty sequence")
    if len(seq_clean) % 3 != 0:
        issues.append(f"Length {len(seq_clean)} not divisible by 3 (truncated to {len(seq_clean) - len(seq_clean) % 3})")

    invalid_chars = set(seq_clean) - {'A', 'U', 'G', 'C'}
    if invalid_chars:
        issues.append(f"Invalid characters: {invalid_chars}")

    codons = seq_to_codons(seq_clean)
    n_codons = len(codons)

    # Check for start codon
    starts_with_aug = codons[0] == 'AUG' if codons else False

    # Check for stop codons
    stop_codons = {'UAA', 'UAG', 'UGA'}
    internal_stops = [i for i, c in enumerate(codons[:-1]) if c in stop_codons]
    ends_with_stop = codons[-1] in stop_codons if codons else False

    if internal_stops:
        issues.append(f"Internal stop codons at positions: {internal_stops}")

    # Unknown codons
    unk_codons = [c for c in codons if c not in CODON_TO_ID]
    if unk_codons:
        issues.append(f"Unknown codons: {set(unk_codons)}")

    return {
        'valid': len(issues) == 0,
        'issues': issues,
        'length_nt': len(seq_clean),
        'length_codons': n_codons,
        'starts_with_AUG': starts_with_aug,
        'ends_with_stop': ends_with_stop,
        'n_internal_stops': len(internal_stops),
    }


# ============================================================
# 2. TRAINING DATASETS
# ============================================================

TRAINING_DATASETS = {
    'mogam-ai/CDS-BART-mRNA-stability': {
        'description': 'iCodon vertebrate mRNA stability profiles (human, mouse, frog, fish)',
        'source_paper': 'Diez et al. 2022, Scientific Reports "iCodon customizes gene expression based on the codon composition"',
        'seq_col': 'seq',
        'label_col': 'y',
        'splits': {'train': 'train', 'val': 'val', 'test': 'test'},
        'label_meaning': 'mRNA half-life z-score (higher = more stable, mean≈0, std≈1)',
        'species': ['Human', 'Mouse', 'Xenopus (frog)', 'Zebrafish'],
        'notes': 'RNA sequences (A,U,G,C). All divisible by 3. Subset of GleghornLab dataset.',
    },
    'GleghornLab/mrna_stability_other': {
        'description': 'Extended multi-species mRNA stability data (superset of mogam-ai dataset)',
        'source_paper': 'Li et al. 2024, Genome Research "CodonBERT large language model for mRNA vaccines"',
        'seq_col': 'rna',
        'label_col': 'labels',
        'splits': {'train': 'train', 'val': 'valid', 'test': 'test'},
        'label_meaning': 'mRNA half-life z-score (higher = more stable)',
        'species': ['Multiple vertebrate species'],
        'notes': 'Has extra "seqs" column (protein-encoded, not used). Contains 1 outlier sequence of 3 nt. Superset of mogam-ai.',
        'extra_col': 'seqs',
    },
}


def download_training_data(export_dir=None):
    """Download and inspect training datasets from HuggingFace Hub."""
    if load_dataset is None:
        print("ERROR: `datasets` library required. Run: pip install datasets")
        return None

    all_data = {}

    for repo_id, info in TRAINING_DATASETS.items():
        print(f"\n{'='*60}")
        print(f"📦 {repo_id}")
        print(f"   {info['description']}")
        print(f"={'='*60}")

        ds = load_dataset(repo_id)

        for split_name, hf_split in info['splits'].items():
            split_data = ds[hf_split]
            seqs = split_data[info['seq_col']]
            labels = split_data[info['label_col']]

            print(f"\n  [{split_name}] {len(seqs)} samples")
            print(f"    Seq lengths (nt):  min={min(len(s) for s in seqs)}, "
                  f"mean={np.mean([len(s) for s in seqs]):.0f}, "
                  f"max={max(len(s) for s in seqs)}")
            print(f"    Seq lengths (cod): min={min(len(s)//3 for s in seqs)}, "
                  f"mean={np.mean([len(s)//3 for s in seqs]):.0f}, "
                  f"max={max(len(s)//3 for s in seqs)}")
            labels_arr = np.array(labels)
            print(f"    Labels:  min={labels_arr.min():.3f}, mean={labels_arr.mean():.3f}, "
                  f"std={labels_arr.std():.3f}, max={labels_arr.max():.3f}")

        all_data[repo_id] = ds

    if export_dir:
        export_training_data(all_data, export_dir)

    return all_data


def preprocess_training_data(use_both_datasets=True, min_codons=3, max_codons=2046,
                              remove_duplicates=True, deduplicate_across_splits=True):
    """
    Preprocess training data: clean, filter, deduplicate, and combine.

    Steps:
    1. Load both HF datasets
    2. Use GleghornLab as primary (superset) OR combine both
    3. Filter: remove sequences < min_codons or > max_codons codons
    4. Filter: remove sequences with NaN labels
    5. Filter: remove sequences with invalid characters
    6. Deduplicate: remove exact sequence duplicates within each split
    7. Deduplicate: ensure no train sequences appear in val/test (data leakage check)
    8. Return clean {train, val, test} dictionaries

    Returns:
        dict with 'train', 'val', 'test' keys, each containing 'sequences' and 'labels' lists
    """
    if load_dataset is None:
        raise ImportError("datasets library required: pip install datasets")

    print("Loading datasets...")

    if use_both_datasets:
        # Use GleghornLab (superset) — it contains ALL of mogam-ai plus extra data
        ds = load_dataset("GleghornLab/mrna_stability_other")
        raw_data = {
            'train': {'seqs': ds['train']['rna'], 'labels': ds['train']['labels']},
            'val': {'seqs': ds['valid']['rna'], 'labels': ds['valid']['labels']},
            'test': {'seqs': ds['test']['rna'], 'labels': ds['test']['labels']},
        }
        print(f"  Using GleghornLab/mrna_stability_other (superset)")
    else:
        # Use mogam-ai only (smaller, cleaner)
        ds = load_dataset("mogam-ai/CDS-BART-mRNA-stability")
        raw_data = {
            'train': {'seqs': ds['train']['seq'], 'labels': ds['train']['y']},
            'val': {'seqs': ds['val']['seq'], 'labels': ds['val']['y']},
            'test': {'seqs': ds['test']['seq'], 'labels': ds['test']['y']},
        }
        print(f"  Using mogam-ai/CDS-BART-mRNA-stability only")

    clean_data = {}
    total_removed = {'short': 0, 'long': 0, 'nan': 0, 'invalid': 0, 'duplicate': 0}

    for split in ['train', 'val', 'test']:
        seqs = raw_data[split]['seqs']
        labels = raw_data[split]['labels']
        orig_count = len(seqs)

        clean_seqs = []
        clean_labels = []
        seen = set()

        for seq, label in zip(seqs, labels):
            # Skip None/empty
            if seq is None or len(seq) == 0:
                total_removed['invalid'] += 1
                continue

            # Normalize: uppercase, T→U
            seq = seq.upper().replace('T', 'U').strip()

            # Check NaN label
            if np.isnan(label):
                total_removed['nan'] += 1
                continue

            # Check invalid characters
            if set(seq) - {'A', 'U', 'G', 'C'}:
                total_removed['invalid'] += 1
                continue

            # Check length
            n_codons = len(seq) // 3
            if n_codons < min_codons:
                total_removed['short'] += 1
                continue
            if n_codons > max_codons:
                total_removed['long'] += 1
                continue

            # Deduplicate within split
            if remove_duplicates:
                if seq in seen:
                    total_removed['duplicate'] += 1
                    continue
                seen.add(seq)

            clean_seqs.append(seq)
            clean_labels.append(float(label))

        clean_data[split] = {'sequences': clean_seqs, 'labels': clean_labels}
        print(f"  [{split}] {orig_count} → {len(clean_seqs)} samples "
              f"(removed {orig_count - len(clean_seqs)})")

    # Cross-split deduplication: check for train/test leakage
    if deduplicate_across_splits:
        test_seqs = set(clean_data['test']['sequences'])
        val_seqs = set(clean_data['val']['sequences'])

        leakage_test = sum(1 for s in clean_data['train']['sequences'] if s in test_seqs)
        leakage_val = sum(1 for s in clean_data['train']['sequences'] if s in val_seqs)
        val_test_overlap = len(val_seqs & test_seqs)

        print(f"\n  Data leakage check:")
        print(f"    Train→Test overlap:  {leakage_test} sequences")
        print(f"    Train→Val overlap:   {leakage_val} sequences")
        print(f"    Val→Test overlap:    {val_test_overlap} sequences")

        if leakage_test > 0 or leakage_val > 0:
            print(f"    ⚠️  WARNING: Data leakage detected! Removing leaked sequences from train...")
            eval_seqs = test_seqs | val_seqs
            filtered_train = [(s, l) for s, l in
                             zip(clean_data['train']['sequences'], clean_data['train']['labels'])
                             if s not in eval_seqs]
            clean_data['train']['sequences'] = [x[0] for x in filtered_train]
            clean_data['train']['labels'] = [x[1] for x in filtered_train]
            print(f"    Train after dedup: {len(clean_data['train']['sequences'])} samples")

    print(f"\n  Removal summary: {total_removed}")
    print(f"  Final sizes: train={len(clean_data['train']['sequences'])}, "
          f"val={len(clean_data['val']['sequences'])}, "
          f"test={len(clean_data['test']['sequences'])}")

    return clean_data


def export_training_data(data, export_dir):
    """Export preprocessed data to CSV files."""
    os.makedirs(export_dir, exist_ok=True)

    if isinstance(data, dict) and 'train' in data and 'sequences' in data.get('train', {}):
        # Already preprocessed format
        for split in ['train', 'val', 'test']:
            if split not in data:
                continue
            filepath = os.path.join(export_dir, f'{split}.csv')
            with open(filepath, 'w', newline='') as f:
                writer = csv.writer(f)
                writer.writerow(['sequence', 'stability_score'])
                for seq, label in zip(data[split]['sequences'], data[split]['labels']):
                    writer.writerow([seq, label])
            print(f"  Exported {split}: {len(data[split]['sequences'])} rows → {filepath}")
    else:
        print("  Export requires preprocessed data. Run preprocess_training_data() first.")


# ============================================================
# 3. BENCHMARK DATASETS
# ============================================================

CODONBERT_BASE_URL = "https://raw.githubusercontent.com/Sanofi-Public/CodonBERT/master/benchmarks/CodonBERT/data/fine-tune"

BENCHMARK_DATASETS = {
    'stability': {
        'url': f"{CODONBERT_BASE_URL}/mRNA_Stability.csv",
        'filename': 'mRNA_Stability.csv',
        'description': 'mRNA Stability (iCodon vertebrate mRNA half-life)',
        'source': 'Diez et al. 2022, Scientific Reports',
        'samples': 65356,
        'seq_length': '3-3066 nt (1-1022 codons)',
        'label': 'Half-life z-score (continuous, mean≈0, std≈1)',
        'metric': 'Spearman ρ',
        'columns': 'sequence, value, dataset, split',
        'species': 'Multi-vertebrate (human, mouse, frog, fish)',
    },
    'mrfp': {
        'url': f"{CODONBERT_BASE_URL}/mRFP_Expression.csv",
        'filename': 'mRFP_Expression.csv',
        'description': 'mRFP Protein Expression in E. coli',
        'source': 'Li et al. 2024, Genome Research (CodonBERT)',
        'samples': 1459,
        'seq_length': '678 nt (226 codons, fixed)',
        'label': 'Fluorescence intensity (log scale, range 7.4-11.4)',
        'metric': 'Spearman ρ',
        'columns': 'sequence, value, dataset, split',
        'species': 'E. coli (synthetic mRFP variants)',
    },
    'vaccine': {
        'url': f"{CODONBERT_BASE_URL}/CoV_Vaccine_Degradation.csv",
        'filename': 'CoV_Vaccine_Degradation.csv',
        'description': 'SARS-CoV-2 mRNA Vaccine Degradation',
        'source': 'CodonBERT benchmark (derived from Stanford OpenVaccine)',
        'samples': 2400,
        'seq_length': '81 nt (27 codons, fixed)',
        'label': 'Degradation score (z-normalized, range -7.2 to 6.5)',
        'metric': 'Spearman ρ',
        'columns': 'sequence, value, dataset, split',
        'species': 'Synthetic SARS-CoV-2 mRNA vaccine fragments',
    },
    'riboswitch': {
        'url': f"{CODONBERT_BASE_URL}/Tc-Riboswitches.csv",
        'filename': 'Tc-Riboswitches.csv',
        'description': 'Tetracycline Riboswitch Activity',
        'source': 'Groher et al. 2018 (via CodonBERT)',
        'samples': 355,
        'seq_length': '66-75 nt (22-25 codons)',
        'label': 'Switching factor (continuous, range -0.3 to 3.1)',
        'metric': 'Spearman ρ',
        'columns': 'sequence, value, dataset, split',
        'species': 'Synthetic tetracycline riboswitches',
    },
    'mlos': {
        'url': f"{CODONBERT_BASE_URL}/MLOS.csv",
        'filename': 'MLOS.csv',
        'description': 'MLOS Flu Vaccine Antigen Expression',
        'source': 'Ren et al. 2024 (HELM/MLOS)',
        'samples': 167,
        'seq_length': '~1700 nt (~567 codons)',
        'label': 'Expression level (continuous, range 0.3-2.2)',
        'metric': 'Spearman ρ',
        'columns': 'cds, value (no split column — uses random 70/15/15)',
        'species': 'Influenza haemagglutinin CDS variants',
        'notes': 'No pre-defined splits. Column name is "cds" not "sequence".',
    },
}


def download_benchmark_data(data_dir='./benchmark_data'):
    """Download all benchmark datasets."""
    os.makedirs(data_dir, exist_ok=True)

    for task_name, info in BENCHMARK_DATASETS.items():
        filepath = os.path.join(data_dir, info['filename'])
        if os.path.exists(filepath):
            size = os.path.getsize(filepath)
            print(f"  ✓ {info['filename']} already exists ({size/1024:.1f} KB)")
        else:
            print(f"  ↓ Downloading {info['filename']}...")
            try:
                urllib.request.urlretrieve(info['url'], filepath)
                size = os.path.getsize(filepath)
                print(f"  ✓ Downloaded {info['filename']} ({size/1024:.1f} KB)")
            except Exception as e:
                print(f"  ✗ Failed to download {info['filename']}: {e}")

    return data_dir


# ============================================================
# 4. AUDIT
# ============================================================

def audit_dataset(sequences, labels, name="dataset"):
    """Run a comprehensive audit on a list of sequences and labels."""
    print(f"\n{'='*60}")
    print(f"AUDIT: {name} ({len(sequences)} sequences)")
    print(f"{'='*60}")

    if len(sequences) == 0:
        print("  (empty)")
        return

    # ---- Sequence stats ----
    lengths_nt = [len(s) for s in sequences]
    lengths_codon = [len(s) // 3 for s in sequences]

    print(f"\n  📏 Sequence Lengths:")
    print(f"    Nucleotides: min={min(lengths_nt)}, mean={np.mean(lengths_nt):.0f}, "
          f"median={np.median(lengths_nt):.0f}, max={max(lengths_nt)}")
    print(f"    Codons:      min={min(lengths_codon)}, mean={np.mean(lengths_codon):.0f}, "
          f"median={np.median(lengths_codon):.0f}, max={max(lengths_codon)}")

    # Length distribution buckets
    buckets = [0, 100, 300, 500, 1000, 2000, 3000, 10000]
    hist = np.histogram(lengths_codon, bins=buckets)[0]
    print(f"    Codon length distribution:")
    for i, count in enumerate(hist):
        pct = 100 * count / len(sequences)
        bar = '█' * int(pct / 2)
        print(f"      {buckets[i]:>5}-{buckets[i+1]:>5} codons: {count:>6} ({pct:>5.1f}%) {bar}")

    # Sequences > 2046 codons (CodonFM max)
    over_limit = sum(1 for c in lengths_codon if c > 2046)
    if over_limit > 0:
        print(f"    ⚠️  {over_limit} sequences exceed CodonFM max (2046 codons) — will be truncated")

    # ---- Nucleotide composition ----
    all_chars = Counter()
    for s in sequences:
        all_chars.update(s.upper())
    total_bases = sum(all_chars.values())
    print(f"\n  🧬 Nucleotide Composition:")
    for base in ['A', 'U', 'G', 'C']:
        count = all_chars.get(base, 0)
        pct = 100 * count / total_bases
        print(f"    {base}: {count:>12,} ({pct:.1f}%)")
    unexpected = {k: v for k, v in all_chars.items() if k not in 'AUGC'}
    if unexpected:
        print(f"    ⚠️  Unexpected characters: {unexpected}")

    # Not divisible by 3
    not_div3 = sum(1 for s in sequences if len(s) % 3 != 0)
    if not_div3 > 0:
        print(f"    ⚠️  {not_div3} sequences not divisible by 3")

    # ---- Codon usage ----
    codon_counts = Counter()
    for s in sequences[:5000]:  # sample for speed
        codons = seq_to_codons(s)
        codon_counts.update(codons)

    print(f"\n  🔤 Codon Usage (top 10 / bottom 10 from {min(5000, len(sequences))} seqs):")
    sorted_codons = codon_counts.most_common()
    for codon, count in sorted_codons[:10]:
        aa = CODON_TABLE.get(codon, '?')
        print(f"    {codon} ({aa:>9s}): {count:>8,}")
    print(f"    ...")
    for codon, count in sorted_codons[-10:]:
        aa = CODON_TABLE.get(codon, '?')
        print(f"    {codon} ({aa:>9s}): {count:>8,}")

    # Start/stop codon analysis
    starts_with_aug = sum(1 for s in sequences if s[:3].upper().replace('T', 'U') == 'AUG')
    stop_codons = {'UAA', 'UAG', 'UGA'}
    ends_with_stop = sum(1 for s in sequences
                         if seq_to_codons(s)[-1] in stop_codons) if sequences else 0
    print(f"\n  🚦 Start/Stop Codons:")
    print(f"    Starts with AUG:  {starts_with_aug}/{len(sequences)} ({100*starts_with_aug/len(sequences):.1f}%)")
    print(f"    Ends with stop:   {ends_with_stop}/{len(sequences)} ({100*ends_with_stop/len(sequences):.1f}%)")

    # ---- Label stats ----
    labels_arr = np.array(labels, dtype=float)
    nan_count = np.isnan(labels_arr).sum()
    labels_clean = labels_arr[~np.isnan(labels_arr)]

    print(f"\n  📊 Label Distribution:")
    print(f"    Count: {len(labels_arr)}, NaN: {nan_count}")
    if len(labels_clean) > 0:
        print(f"    Min:    {labels_clean.min():.4f}")
        print(f"    Q1:     {np.percentile(labels_clean, 25):.4f}")
        print(f"    Median: {np.median(labels_clean):.4f}")
        print(f"    Q3:     {np.percentile(labels_clean, 75):.4f}")
        print(f"    Max:    {labels_clean.max():.4f}")
        print(f"    Mean:   {labels_clean.mean():.4f}")
        print(f"    Std:    {labels_clean.std():.4f}")
        print(f"    Skew:   {float(((labels_clean - labels_clean.mean()) ** 3).mean() / labels_clean.std() ** 3):.4f}")

    # ---- Duplicates ----
    unique_seqs = len(set(sequences))
    dup_count = len(sequences) - unique_seqs
    print(f"\n  🔍 Duplicates:")
    print(f"    Unique sequences:    {unique_seqs}")
    print(f"    Duplicate sequences: {dup_count}")

    # ---- Outliers ----
    if len(labels_clean) > 0:
        q1, q3 = np.percentile(labels_clean, [25, 75])
        iqr = q3 - q1
        lower = q1 - 3 * iqr
        upper = q3 + 3 * iqr
        outliers = np.sum((labels_clean < lower) | (labels_clean > upper))
        print(f"\n  ⚡ Outliers (>3 IQR):")
        print(f"    Label outliers: {outliers}/{len(labels_clean)}")

    very_short = sum(1 for c in lengths_codon if c < 10)
    very_long = sum(1 for c in lengths_codon if c > 1000)
    print(f"    Very short (<10 codons): {very_short}")
    print(f"    Very long (>1000 codons): {very_long}")


def run_full_audit():
    """Run audit on all training and benchmark datasets."""
    print("=" * 70)
    print("FULL DATASET AUDIT")
    print("=" * 70)

    # Training datasets
    print("\n\n📚 TRAINING DATASETS")
    print("=" * 70)

    if load_dataset is not None:
        ds1 = load_dataset("mogam-ai/CDS-BART-mRNA-stability")
        for split in ['train', 'val', 'test']:
            audit_dataset(
                ds1[split]['seq'], ds1[split]['y'],
                f"mogam-ai/CDS-BART-mRNA-stability [{split}]"
            )

        ds2 = load_dataset("GleghornLab/mrna_stability_other")
        for split, hf_split in [('train', 'train'), ('val', 'valid'), ('test', 'test')]:
            audit_dataset(
                ds2[hf_split]['rna'], ds2[hf_split]['labels'],
                f"GleghornLab/mrna_stability_other [{split}]"
            )

        # Cross-dataset analysis
        print("\n\n📊 CROSS-DATASET ANALYSIS")
        print("=" * 60)
        ds1_all = set(ds1['train']['seq']) | set(ds1['val']['seq']) | set(ds1['test']['seq'])
        ds2_all = set(ds2['train']['rna']) | set(ds2['valid']['rna']) | set(ds2['test']['rna'])
        print(f"  mogam-ai total unique:    {len(ds1_all)}")
        print(f"  GleghornLab total unique: {len(ds2_all)}")
        print(f"  Overlap:                  {len(ds1_all & ds2_all)}")
        print(f"  mogam-ai ⊂ GleghornLab:   {ds1_all.issubset(ds2_all)}")
        print(f"  GleghornLab-only:         {len(ds2_all - ds1_all)}")
    else:
        print("  Skipping (datasets library not installed)")

    # Benchmark datasets
    print("\n\n📊 BENCHMARK DATASETS")
    print("=" * 70)

    if pd is not None:
        data_dir = download_benchmark_data()
        for task_name, info in BENCHMARK_DATASETS.items():
            filepath = os.path.join(data_dir, info['filename'])
            if not os.path.exists(filepath):
                continue
            df = pd.read_csv(filepath)
            df.columns = [c.lower().strip() for c in df.columns]

            seq_col = 'sequence' if 'sequence' in df.columns else 'cds'
            val_col = 'value'

            if seq_col in df.columns and val_col in df.columns:
                audit_dataset(
                    df[seq_col].tolist(), df[val_col].tolist(),
                    f"Benchmark: {task_name} ({info['filename']})"
                )
    else:
        print("  Skipping (pandas not installed)")


# ============================================================
# 5. VOCAB DISPLAY
# ============================================================

def show_vocab():
    """Display the full codon vocabulary with amino acid mapping."""
    print("=" * 70)
    print("CodonFM Tokenizer Vocabulary (vocab_size=69)")
    print("=" * 70)

    print("\n  SPECIAL TOKENS:")
    print(f"  {'ID':>4}  {'Token':<10}  {'Description'}")
    print(f"  {'─'*4}  {'─'*10}  {'─'*30}")
    descriptions = {
        '[CLS]': 'Classification token (prepended)',
        '[SEP]': 'Separator token (appended)',
        '[MASK]': 'Mask token (for MLM pretraining)',
        '[PAD]': 'Padding token (pad_token_id=3)',
        '[UNK]': 'Unknown token (for invalid codons)',
    }
    for token, tid in sorted(SPECIAL_TOKENS.items(), key=lambda x: x[1]):
        print(f"  {tid:>4}  {token:<10}  {descriptions.get(token, '')}")

    print(f"\n  CODON TOKENS (64 codons → 20 amino acids + 3 stop):")
    print(f"  {'ID':>4}  {'Codon':<6}  {'Amino Acid':<12}  {'ID':>4}  {'Codon':<6}  {'Amino Acid':<12}  "
          f"{'ID':>4}  {'Codon':<6}  {'Amino Acid':<12}  {'ID':>4}  {'Codon':<6}  {'Amino Acid'}")
    print(f"  {'─'*4}  {'─'*6}  {'─'*12}  {'─'*4}  {'─'*6}  {'─'*12}  "
          f"{'─'*4}  {'─'*6}  {'─'*12}  {'─'*4}  {'─'*6}  {'─'*12}")

    items = sorted(CODON_TO_ID.items(), key=lambda x: x[1])
    for i in range(0, len(items), 4):
        row_parts = []
        for j in range(4):
            if i + j < len(items):
                codon, tid = items[i + j]
                aa = CODON_TABLE.get(codon, '?')
                row_parts.append(f"  {tid:>4}  {codon:<6}  {aa:<12}")
            else:
                row_parts.append(f"  {'':>4}  {'':6}  {'':12}")
        print("".join(row_parts))

    print(f"\n  TOKENIZATION EXAMPLE:")
    example = "AUGGCAGCCGAGACUCGG"
    codons = seq_to_codons(example)
    tokens = tokenize_mRNA(example)
    print(f"    Input:     {example}")
    print(f"    Codons:    {' '.join(codons)}")
    print(f"    Token IDs: {tokens['input_ids']}")
    decoded = [ID_TO_CODON.get(t, '?') for t in tokens['input_ids']]
    print(f"    Decoded:   {' '.join(decoded)}")

    print(f"\n  CONFIG (matches nvidia/NV-CodonFM-Encodon-80M-v1/config.json):")
    print(f"    vocab_size:              69")
    print(f"    pad_token_id:            3 ([PAD])")
    print(f"    max_position_embeddings: 2046 codons (~6138 nt)")
    print(f"    position_embedding_type: rotary (RoPE, θ=10000)")


# ============================================================
# CLI
# ============================================================

def main():
    parser = argparse.ArgumentParser(
        description="Dataset setup for CodonFM-80M mRNA stability fine-tuning",
        formatter_class=argparse.RawDescriptionHelpFormatter,
        epilog="""
Examples:
  python data_setup.py --all                        # Download & audit everything
  python data_setup.py --training                   # Download training datasets
  python data_setup.py --training --export ./data   # Download & export to CSV
  python data_setup.py --benchmark                  # Download benchmark datasets
  python data_setup.py --audit                      # Full audit of all datasets
  python data_setup.py --vocab                      # Show codon vocabulary
  python data_setup.py --preprocess                 # Preprocess & deduplicate
        """
    )

    parser.add_argument('--all', action='store_true', help='Download and audit everything')
    parser.add_argument('--training', action='store_true', help='Download training datasets from HF Hub')
    parser.add_argument('--benchmark', action='store_true', help='Download benchmark datasets from GitHub')
    parser.add_argument('--audit', action='store_true', help='Run full dataset audit')
    parser.add_argument('--preprocess', action='store_true', help='Preprocess training data (clean, deduplicate)')
    parser.add_argument('--vocab', action='store_true', help='Show codon vocabulary and tokenizer')
    parser.add_argument('--export', type=str, default=None, help='Export directory for preprocessed CSVs')
    parser.add_argument('--benchmark_dir', type=str, default='./benchmark_data',
                        help='Directory for benchmark data')
    parser.add_argument('--use_both', action='store_true', default=True,
                        help='Use both training datasets (default: True)')
    parser.add_argument('--mogam_only', action='store_true',
                        help='Use only mogam-ai dataset (smaller, cleaner)')

    args = parser.parse_args()

    # Default: show help
    if not any([args.all, args.training, args.benchmark, args.audit, args.preprocess, args.vocab]):
        parser.print_help()
        return

    if args.vocab or args.all:
        show_vocab()

    if args.training or args.all:
        print("\n\n📦 DOWNLOADING TRAINING DATASETS")
        print("=" * 60)
        download_training_data(export_dir=args.export)

    if args.benchmark or args.all:
        print("\n\n📦 DOWNLOADING BENCHMARK DATASETS")
        print("=" * 60)
        download_benchmark_data(args.benchmark_dir)

    if args.preprocess or args.all:
        print("\n\n🔧 PREPROCESSING TRAINING DATA")
        print("=" * 60)
        use_both = not args.mogam_only
        clean_data = preprocess_training_data(use_both_datasets=use_both)
        if args.export:
            export_training_data(clean_data, args.export)

    if args.audit or args.all:
        print("\n\n🔍 RUNNING FULL AUDIT")
        run_full_audit()


if __name__ == '__main__':
    main()