app.py

import spaces
import gradio as gr
import torch
import os
import tempfile
import time
import polars as pl
import numpy as np
import logging
from pathlib import Path
from omegaconf import OmegaConf, DictConfig
from gradio_log import Log

# --- InstaNovo Imports ---
try:
    from instanovo.transformer.model import InstaNovo
    from instanovo.diffusion.multinomial_diffusion import InstaNovoPlus
    from instanovo.utils import SpectrumDataFrame, ResidueSet, Metrics
    from instanovo.transformer.dataset import SpectrumDataset, collate_batch
    from instanovo.inference import (
        GreedyDecoder,
        KnapsackBeamSearchDecoder,
        Knapsack,
        ScoredSequence,
        Decoder,
    )
    from instanovo.inference.diffusion import DiffusionDecoder
    from instanovo.constants import (
        MASS_SCALE,
        MAX_MASS,
        DIFFUSION_START_STEP,
    )
    from torch.utils.data import DataLoader
    import torch.nn.functional as F # For padding
except ImportError as e:
    raise ImportError(f"Failed to import InstaNovo components: {e}")

# --- Configuration ---
TRANSFORMER_MODEL_ID = "instanovo-v1.1.0"
DIFFUSION_MODEL_ID = "instanovoplus-v1.1.0-alpha"
KNAPSACK_DIR = Path("./knapsack_cache")
DEFAULT_CONFIG_PATH = Path(
    "./configs/inference/default.yaml"
)

# Determine device
DEVICE = "cuda" if torch.cuda.is_available() else "cpu"
FP16 = DEVICE == "cuda"

# --- Global Variables (Load Models and Knapsack Once) ---
INSTANOVO: InstaNovo | None = None
INSTANOVO_CONFIG: DictConfig | None = None
INSTANOVOPLUS: InstaNovoPlus | None = None
INSTANOVOPLUS_CONFIG: DictConfig | None = None
KNAPSACK: Knapsack | None = None
RESIDUE_SET: ResidueSet | None = None

# --- Assets ---
gr.set_static_paths(paths=[Path.cwd().absolute()/"assets"])

# Create gradio temporary directory
temp_dir = Path('/tmp/gradio')
if not temp_dir.exists():
    temp_dir.mkdir()

# Logging configuration
# TODO: create logfile per user/session
# see https://www.gradio.app/guides/resource-cleanup
log_file = "/tmp/instanovo_gradio_log.txt"
Path(log_file).touch()

logger = logging.getLogger("instanovo")
logger.setLevel(logging.INFO)
if not logger.handlers:
    file_handler = logging.FileHandler(log_file)
    file_handler.setLevel(logging.INFO)
    stream_handler = logging.StreamHandler()
    stream_handler.setLevel(logging.INFO)
    logger.addHandler(stream_handler)


def load_models_and_knapsack():
    """Loads the InstaNovo models and generates/loads the knapsack."""
    global INSTANOVO, KNAPSACK, INSTANOVO_CONFIG, RESIDUE_SET, INSTANOVOPLUS, INSTANOVOPLUS_CONFIG
    models_loaded = INSTANOVO is not None and INSTANOVOPLUS is not None
    if models_loaded:
        logger.info("Models already loaded.")
        # Still check knapsack if not loaded
        if KNAPSACK is None:
             logger.info("Models loaded, but knapsack needs loading/generation.")
        else:
             return # All loaded

    # --- Load Transformer Model ---
    if INSTANOVO is None:
        logger.info(f"Loading InstaNovo (Transformer) model: {TRANSFORMER_MODEL_ID} to {DEVICE}...")
        try:
            INSTANOVO, INSTANOVO_CONFIG = InstaNovo.from_pretrained(TRANSFORMER_MODEL_ID)
            INSTANOVO.to(DEVICE)
            INSTANOVO.eval()
            RESIDUE_SET = INSTANOVO.residue_set
            logger.info("Transformer model loaded successfully.")
        except Exception as e:
            logger.error(f"Error loading Transformer model: {e}")
            raise gr.Error(f"Failed to load InstaNovo Transformer model: {TRANSFORMER_MODEL_ID}. Error: {e}")
    else:
         logger.info("Transformer model already loaded.")


    # --- Load Diffusion Model ---
    if INSTANOVOPLUS is None:
        logger.info(f"Loading InstaNovo+ (Diffusion) model: {DIFFUSION_MODEL_ID} to {DEVICE}...")
        try:
            INSTANOVOPLUS, INSTANOVOPLUS_CONFIG = InstaNovoPlus.from_pretrained(DIFFUSION_MODEL_ID)
            INSTANOVOPLUS.to(DEVICE)
            INSTANOVOPLUS.eval()
            if RESIDUE_SET is not None and INSTANOVOPLUS.residues != RESIDUE_SET:
                 logger.warning("Residue sets between Transformer and Diffusion models differ. Using Transformer's set.")
            elif RESIDUE_SET is None:
                 RESIDUE_SET = INSTANOVOPLUS.residues

            logger.info("Diffusion model loaded successfully.")
        except Exception as e:
            logger.error(f"Error loading Diffusion model: {e}")
            gr.Warning(f"Failed to load InstaNovo+ Diffusion model ({DIFFUSION_MODEL_ID}): {e}. Diffusion modes will be unavailable.")
            INSTANOVOPLUS = None
    else:
        logger.info("Diffusion model already loaded.")


    # --- Knapsack Handling ---
    # Only attempt knapsack loading/generation if the Transformer model is loaded
    if INSTANOVO is not None and RESIDUE_SET is not None and KNAPSACK is None:
        knapsack_exists = (
            (KNAPSACK_DIR / "parameters.pkl").exists()
            and (KNAPSACK_DIR / "masses.npy").exists()
            and (KNAPSACK_DIR / "chart.npy").exists()
        )

        if knapsack_exists:
            logger.info(f"Loading pre-generated knapsack from {KNAPSACK_DIR}...")
            try:
                KNAPSACK = Knapsack.from_file(str(KNAPSACK_DIR))
                logger.info("Knapsack loaded successfully.")
            except Exception as e:
                logger.info(f"Error loading knapsack: {e}. Will attempt to regenerate.")
                KNAPSACK = None
                knapsack_exists = False

        if not knapsack_exists:
            logger.info("Knapsack not found or failed to load. Generating knapsack...")
            try:
                residue_masses_knapsack = dict(RESIDUE_SET.residue_masses.copy())
                special_and_nonpositive = list(RESIDUE_SET.special_tokens) + [
                    k for k, v in residue_masses_knapsack.items() if v <= 0
                ]
                if special_and_nonpositive:
                     logger.info(f"Excluding special/non-positive mass residues from knapsack: {special_and_nonpositive}")
                     for res in set(special_and_nonpositive):
                         if res in residue_masses_knapsack:
                             del residue_masses_knapsack[res]

                valid_residue_indices = {
                    res: idx
                    for res, idx in RESIDUE_SET.residue_to_index.items()
                    if res in residue_masses_knapsack
                }

                if not residue_masses_knapsack:
                    raise ValueError("No valid residues with positive mass found for knapsack generation.")

                KNAPSACK = Knapsack.construct_knapsack(
                    residue_masses=residue_masses_knapsack,
                    residue_indices=valid_residue_indices,
                    max_mass=MAX_MASS,
                    mass_scale=MASS_SCALE,
                )
                logger.info(f"Knapsack generated. Saving to {KNAPSACK_DIR}...")
                KNAPSACK_DIR.mkdir(parents=True, exist_ok=True)
                KNAPSACK.save(str(KNAPSACK_DIR))
                logger.info("Knapsack saved.")
            except Exception as e:
                logger.error(f"Error generating or saving knapsack: {e}", exc_info=True)
                gr.Warning(f"Failed to generate Knapsack. Knapsack Beam Search will not be available. Error: {e}")
                KNAPSACK = None
    elif KNAPSACK is not None:
        logger.info("Knapsack already loaded.")
    elif INSTANOVO is None:
         logger.warning("Transformer model not loaded, skipping Knapsack loading/generation.")


# Load models and knapsack when the script starts
load_models_and_knapsack()


def create_inference_config(
    input_path: str,
    output_path: str,
) -> DictConfig:
    """Creates a base OmegaConf DictConfig for prediction environment."""
    if DEFAULT_CONFIG_PATH.exists():
        base_cfg = OmegaConf.load(DEFAULT_CONFIG_PATH)
        logger.info(f"Loaded base config from {DEFAULT_CONFIG_PATH}")
    else:
         logger.info(f"Warning: Default config not found at {DEFAULT_CONFIG_PATH}. Using minimal config.")
         base_cfg = OmegaConf.create({
             "data_path": None, "instanovo_model": TRANSFORMER_MODEL_ID,
             "instanovoplus_model": DIFFUSION_MODEL_ID, "output_path": None,
             "knapsack_path": str(KNAPSACK_DIR), "denovo": True, "refine": True,
             "num_beams": 1, "max_length": 40, "max_charge": 10,
             "isotope_error_range": [0, 1], "subset": 1.0, "use_knapsack": False,
             "save_beams": False, "batch_size": 64, "device": DEVICE, "fp16": FP16,
             "log_interval": 500, "use_basic_logging": True,
             "filter_precursor_ppm": 20, "filter_confidence": 1e-4,
             "filter_fdr_threshold": 0.05, "suppressed_residues": None,
             "disable_terminal_residues_anywhere": True,
             "residue_remapping": {
                 "M(ox)": "M[UNIMOD:35]", "M(+15.99)": "M[UNIMOD:35]",
                 "S(p)": "S[UNIMOD:21]", "T(p)": "T[UNIMOD:21]", "Y(p)": "Y[UNIMOD:21]",
                 "S(+79.97)": "S[UNIMOD:21]", "T(+79.97)": "T[UNIMOD:21]", "Y(+79.97)": "Y[UNIMOD:21]",
                 "Q(+0.98)": "Q[UNIMOD:7]", "N(+0.98)": "N[UNIMOD:7]",
                 "Q(+.98)": "Q[UNIMOD:7]", "N(+.98)": "N[UNIMOD:7]",
                 "C(+57.02)": "C[UNIMOD:4]", "(+42.01)": "[UNIMOD:1]",
                 "(+43.01)": "[UNIMOD:5]", "(-17.03)": "[UNIMOD:385]",
             },
             "column_map": {
                "Modified sequence": "modified_sequence", "MS/MS m/z": "precursor_mz",
                "Mass": "precursor_mass", "Charge": "precursor_charge",
                "Mass values": "mz_array", "Mass spectrum": "mz_array",
                "Intensity": "intensity_array", "Raw intensity spectrum": "intensity_array",
                "Scan number": "scan_number"
             },
             "index_columns": [
                 "scan_number", "precursor_mz", "precursor_charge",
                 "retention_time", "spectrum_id", "experiment_name",
             ],
         })

    cfg_overrides = {
        "data_path": input_path, "output_path": output_path,
        "device": DEVICE, "fp16": FP16, "denovo": True,
    }
    final_cfg = OmegaConf.merge(base_cfg, cfg_overrides)
    logger.info(f"Created inference config:\n{OmegaConf.to_yaml(final_cfg)}")
    return final_cfg

def _get_transformer_decoder(selection: str, config: DictConfig) -> tuple[Decoder, int, bool]:
    """Helper to instantiate the correct transformer decoder based on selection."""
    global INSTANOVO, KNAPSACK
    if INSTANOVO is None:
        raise gr.Error("InstaNovo Transformer model not loaded.")

    num_beams = 1
    use_knapsack = False
    decoder: Decoder

    if "Greedy" in selection:
        decoder = GreedyDecoder(
            model=INSTANOVO,
            mass_scale=MASS_SCALE,
            suppressed_residues=config.get("suppressed_residues", None),
            disable_terminal_residues_anywhere=config.get("disable_terminal_residues_anywhere", True),
        )
    elif "Knapsack" in selection:
        if KNAPSACK is None:
            raise gr.Error("Knapsack is not available. Cannot use Knapsack Beam Search.")
        decoder = KnapsackBeamSearchDecoder(model=INSTANOVO, knapsack=KNAPSACK)
        num_beams = 5 # Default beam size for knapsack
        use_knapsack = True
    else:
        raise ValueError(f"Unknown transformer decoder selection: {selection}")

    logger.info(f"Using Transformer decoder: {type(decoder).__name__} (Num beams: {num_beams}, Use Knapsack: {use_knapsack})")
    return decoder, num_beams, use_knapsack


def run_transformer_prediction(dl, config, transformer_decoder_selection):
    """Runs prediction using only the transformer model."""
    global RESIDUE_SET
    if RESIDUE_SET is None:
        raise gr.Error("ResidueSet not loaded.")

    decoder, num_beams, use_knapsack = _get_transformer_decoder(transformer_decoder_selection, config)

    results_list: list[ScoredSequence | list] = []
    start_time = time.time()
    for i, batch in enumerate(dl):
        spectra, precursors, spectra_mask, _, _ = batch
        spectra = spectra.to(DEVICE)
        precursors = precursors.to(DEVICE)
        spectra_mask = spectra_mask.to(DEVICE)

        with torch.no_grad(), torch.amp.autocast(DEVICE, dtype=torch.float16, enabled=FP16):
            batch_predictions = decoder.decode(
                spectra=spectra,
                precursors=precursors,
                beam_size=num_beams,
                max_length=config.max_length,
                mass_tolerance=config.get("filter_precursor_ppm", 20) * 1e-6,
                max_isotope=config.isotope_error_range[1] if config.isotope_error_range else 1,
                return_beam=False, # Only top result
            )
        results_list.extend(batch_predictions)
        if (i + 1) % 10 == 0 or (i + 1) == len(dl):
             logger.info(f"Transformer prediction: Processed batch {i+1}/{len(dl)}")

    end_time = time.time()
    logger.info(f"Transformer prediction finished in {end_time - start_time:.2f} seconds.")
    return results_list

def run_diffusion_prediction(dl, config):
    """Runs prediction using only the diffusion model."""
    global INSTANOVOPLUS, RESIDUE_SET
    if INSTANOVOPLUS is None or RESIDUE_SET is None:
        raise gr.Error("InstaNovo+ Diffusion model not loaded.")

    diffusion_decoder = DiffusionDecoder(model=INSTANOVOPLUS)
    logger.info(f"Using decoder: {type(diffusion_decoder).__name__}")

    results_sequences = []
    results_log_probs = []
    start_time = time.time()

    # Re-create dataloader iterator to get precursor info easily later
    all_batches = list(dl)

    for i, batch in enumerate(all_batches):
        spectra, precursors, spectra_mask, _, _ = batch
        spectra = spectra.to(DEVICE)
        precursors = precursors.to(DEVICE)
        spectra_mask = spectra_mask.to(DEVICE)

        with torch.no_grad(), torch.amp.autocast(DEVICE, dtype=torch.float16, enabled=FP16):
            batch_sequences, batch_log_probs = diffusion_decoder.decode(
                spectra=spectra,
                spectra_padding_mask=spectra_mask,
                precursors=precursors,
                initial_sequence=None,
            )
        results_sequences.extend(batch_sequences)
        results_log_probs.extend(batch_log_probs)
        if (i + 1) % 10 == 0 or (i + 1) == len(all_batches):
             logger.info(f"Diffusion prediction: Processed batch {i+1}/{len(all_batches)}")

    end_time = time.time()
    logger.info(f"Diffusion prediction finished in {end_time - start_time:.2f} seconds.")

    scored_results = []
    metrics_calc = Metrics(RESIDUE_SET, config.isotope_error_range)
    all_precursors = torch.cat([b[1] for b in all_batches], dim=0) # b[1] is precursors

    for idx, (seq, logp) in enumerate(zip(results_sequences, results_log_probs)):
         prec_mz = all_precursors[idx, 1].item()
         prec_ch = int(all_precursors[idx, 2].item())
         try:
             _, delta_mass_list = metrics_calc.matches_precursor(seq, prec_mz, prec_ch)
             min_abs_ppm = min(abs(p) for p in delta_mass_list) if delta_mass_list else float("nan")
         except Exception as e:
             logger.info(f"Warning: Could not calculate delta mass for diffusion prediction {idx}: {e}")
             min_abs_ppm = float("nan")

         scored_results.append(
             ScoredSequence(sequence=seq, mass_error=min_abs_ppm, sequence_log_probability=logp, token_log_probabilities=[])
         )

    return scored_results


def run_refinement_prediction(dl, config, transformer_decoder_selection):
    """Runs transformer prediction followed by diffusion refinement."""
    global INSTANOVO, INSTANOVOPLUS, RESIDUE_SET, INSTANOVOPLUS_CONFIG
    if INSTANOVO is None or INSTANOVOPLUS is None or RESIDUE_SET is None or INSTANOVOPLUS_CONFIG is None:
         missing = [m for m, v in [("Transformer", INSTANOVO), ("Diffusion", INSTANOVOPLUS)] if v is None]
         raise gr.Error(f"Cannot run refinement: {', '.join(missing)} model not loaded.")

    # 1. Run Transformer Prediction (using selected decoder)
    logger.info(f"Running Transformer prediction ({transformer_decoder_selection}) for refinement...")
    transformer_decoder, num_beams, _ = _get_transformer_decoder(transformer_decoder_selection, config) # Get selected decoder
    transformer_results_list: list[ScoredSequence | list] = []

    all_batches = list(dl) # Store batches

    start_time_transformer = time.time()
    for i, batch in enumerate(all_batches):
        spectra, precursors, spectra_mask, _, _ = batch
        spectra = spectra.to(DEVICE)
        precursors = precursors.to(DEVICE)
        spectra_mask = spectra_mask.to(DEVICE)

        with torch.no_grad(), torch.amp.autocast(DEVICE, dtype=torch.float16, enabled=FP16):
            batch_predictions = transformer_decoder.decode(
                spectra=spectra,
                precursors=precursors,
                beam_size=num_beams, # Use selected beam size
                max_length=config.max_length,
                mass_tolerance=config.get("filter_precursor_ppm", 20) * 1e-6,
                max_isotope=config.isotope_error_range[1] if config.isotope_error_range else 1,
                return_beam=False, # Only top result needed for refinement
            )
        transformer_results_list.extend(batch_predictions)
        if (i + 1) % 10 == 0 or (i + 1) == len(all_batches):
            logger.info(f"Refinement (Transformer): Processed batch {i+1}/{len(all_batches)}")

    logger.info(f"Transformer prediction for refinement finished in {time.time() - start_time_transformer:.2f} seconds.")

    # 2. Prepare Transformer Predictions as Initial Sequences for Diffusion
    logger.info("Encoding transformer predictions for diffusion input...")
    encoded_transformer_preds = []
    max_len_diffusion = INSTANOVOPLUS_CONFIG.get("max_length", 40)

    for res in transformer_results_list:
        if isinstance(res, ScoredSequence) and res.sequence:
             # Encode sequence *without* EOS for diffusion input.
             encoded = RESIDUE_SET.encode(res.sequence, add_eos=False, return_tensor='pt')
        else:
            # If transformer failed, provide a dummy PAD sequence
             encoded = torch.full((max_len_diffusion,), RESIDUE_SET.PAD_INDEX, dtype=torch.long)


        # Pad or truncate to the diffusion model's max length
        current_len = encoded.shape[0]
        if current_len > max_len_diffusion:
             logger.warning(f"Transformer prediction exceeded diffusion max length ({max_len_diffusion}). Truncating.")
             encoded = encoded[:max_len_diffusion]
        elif current_len < max_len_diffusion:
            padding = torch.full((max_len_diffusion - current_len,), RESIDUE_SET.PAD_INDEX, dtype=torch.long)
            encoded = torch.cat((encoded, padding))

        encoded_transformer_preds.append(encoded)

    if not encoded_transformer_preds:
        raise gr.Error("Transformer prediction yielded no results to refine.")
    encoded_transformer_preds_tensor = torch.stack(encoded_transformer_preds).to(DEVICE)
    logger.info(f"Encoded {encoded_transformer_preds_tensor.shape[0]} sequences for diffusion.")


    # 3. Run Diffusion Refinement
    logger.info("Running Diffusion refinement...")
    diffusion_decoder = DiffusionDecoder(model=INSTANOVOPLUS)
    refined_sequences = []
    refined_log_probs = []
    start_time_diffusion = time.time()

    current_idx = 0
    for i, batch in enumerate(all_batches):
        spectra, precursors, spectra_mask, _, _ = batch
        spectra = spectra.to(DEVICE)
        precursors = precursors.to(DEVICE)
        spectra_mask = spectra_mask.to(DEVICE)

        batch_size = spectra.shape[0]
        initial_sequences_batch = encoded_transformer_preds_tensor[current_idx : current_idx + batch_size]
        current_idx += batch_size

        if initial_sequences_batch.shape[0] != batch_size:
             logger.error(f"Batch size mismatch during refinement: expected {batch_size}, got {initial_sequences_batch.shape[0]}")
             continue # Skip batch?

        with torch.no_grad(), torch.amp.autocast(DEVICE, dtype=torch.float16, enabled=FP16):
            batch_refined_seqs, batch_refined_logp = diffusion_decoder.decode(
                spectra=spectra,
                spectra_padding_mask=spectra_mask,
                precursors=precursors,
                initial_sequence=initial_sequences_batch,
                start_step=DIFFUSION_START_STEP,
            )
        refined_sequences.extend(batch_refined_seqs)
        refined_log_probs.extend(batch_refined_logp)
        if (i + 1) % 10 == 0 or (i + 1) == len(all_batches):
             logger.info(f"Refinement (Diffusion): Processed batch {i+1}/{len(all_batches)}")

    logger.info(f"Diffusion refinement finished in {time.time() - start_time_diffusion:.2f} seconds.")

    # 4. Combine and Format Results
    all_precursors = torch.cat([b[1] for b in all_batches], dim=0) # b[1] is precursors
    metrics_calc = Metrics(RESIDUE_SET, config.isotope_error_range)
    combined_results = []
    for idx, (transformer_res, refined_seq, refined_logp) in enumerate(zip(transformer_results_list, refined_sequences, refined_log_probs)):
         prec_mz = all_precursors[idx, 1].item()
         prec_ch = int(all_precursors[idx, 2].item())
         try:
             _, delta_mass_list = metrics_calc.matches_precursor(refined_seq, prec_mz, prec_ch)
             min_abs_ppm = min(abs(p) for p in delta_mass_list) if delta_mass_list else float("nan")
         except Exception as e:
             logger.info(f"Warning: Could not calculate delta mass for refined prediction {idx}: {e}")
             min_abs_ppm = float("nan")

         combined_data = {
             "transformer_prediction": "".join(transformer_res.sequence) if isinstance(transformer_res, ScoredSequence) else "",
             "transformer_log_probability": transformer_res.sequence_log_probability if isinstance(transformer_res, ScoredSequence) else float('-inf'),
             "refined_prediction": "".join(refined_seq),
             "refined_log_probability": refined_logp,
             "refined_delta_mass_ppm": min_abs_ppm,
         }
         combined_results.append(combined_data)

    return combined_results


@spaces.GPU
def predict_peptides(input_file, mode_selection, transformer_decoder_selection):
    """
    Main function to load data, select mode, run prediction, and return results.
    """
    # Ensure models are loaded
    if INSTANOVO is None or RESIDUE_SET is None:
        load_models_and_knapsack() # Try reload
        if INSTANOVO is None:
            raise gr.Error("InstaNovo Transformer model failed to load. Cannot perform prediction.")
    if ("refinement" in mode_selection or "InstaNovo+" in mode_selection) and INSTANOVOPLUS is None:
         load_models_and_knapsack() # Try reload diffusion
         if INSTANOVOPLUS is None:
             raise gr.Error("InstaNovo+ Diffusion model failed to load. Cannot perform Refinement or InstaNovo+ Only prediction.")
    if "Knapsack" in transformer_decoder_selection and KNAPSACK is None:
         load_models_and_knapsack() # Try reload knapsack
         if KNAPSACK is None:
             raise gr.Error("Knapsack failed to load. Cannot use Knapsack Beam Search.")


    if input_file is None:
        raise gr.Error("Please upload a mass spectrometry file.")

    input_path = input_file.name
    logger.info("--- New Prediction Request ---")
    logger.info(f"Input File: {input_path}")
    logger.info(f"Selected Mode: {mode_selection}")
    if "Refinement" in mode_selection or "InstaNovo Only" in mode_selection:
        logger.info(f"Selected Transformer Decoder: {transformer_decoder_selection}")

    # Create temp output file
    gradio_tmp_dir = os.environ.get("GRADIO_TEMP_DIR", "/tmp")
    try:
        with tempfile.NamedTemporaryFile(dir=gradio_tmp_dir, delete=False, suffix=".csv") as temp_out:
            output_csv_path = temp_out.name
        logger.info(f"Temporary output path: {output_csv_path}")
    except Exception as e:
         logger.error(f"Failed to create temporary file in {gradio_tmp_dir}: {e}")
         raise gr.Error(f"Failed to create temporary output file: {e}")

    try:
        config = create_inference_config(input_path, output_csv_path)

        logger.info("Loading spectrum data...")
        try:
            # Load data eagerly
            sdf = SpectrumDataFrame.load(
                config.data_path, lazy=False, is_annotated=False,
                column_mapping=config.get("column_map", None), shuffle=False, verbose=True,
            )
            original_size = len(sdf)
            max_charge = config.get("max_charge", 10)
            if "precursor_charge" in sdf.df.columns:
                sdf.filter_rows(
                    lambda row: ("precursor_charge" in row and row["precursor_charge"] is not None and 0 < row["precursor_charge"] <= max_charge)
                )
                if len(sdf) < original_size:
                    logger.info(f"Warning: Filtered {original_size - len(sdf)} spectra with invalid or out-of-range charge (<=0 or >{max_charge}).")
            else:
                 logger.warning("Column 'precursor_charge' not found. Cannot filter by charge.")

            if len(sdf) == 0:
                 raise gr.Error("No valid spectra found in the uploaded file after filtering.")
            logger.info(f"Data loaded: {len(sdf)} spectra.")
            index_cols_present = [col for col in config.index_columns if col in sdf.df.columns]
            base_df_pd = sdf.df.select(index_cols_present).to_pandas()

        except Exception as e:
            logger.error(f"Error loading data: {e}", exc_info=True)
            raise gr.Error(f"Failed to load or process the spectrum file. Error: {e}")

        if RESIDUE_SET is None: raise gr.Error("Residue set not loaded.") # Should not happen if model loaded

        # --- Prepare DataLoader ---
        # Use reverse_peptide=True for Transformer steps, False for Diffusion-only
        reverse_for_transformer = "InstaNovo+ Only" not in mode_selection
        ds = SpectrumDataset(
            sdf, RESIDUE_SET,
            INSTANOVO_CONFIG.get("n_peaks", 200) if INSTANOVO_CONFIG else 200,
            return_str=True, annotated=False,
            pad_spectrum_max_length=config.get("compile_model", False) or config.get("use_flash_attention", False),
            bin_spectra=config.get("conv_peak_encoder", False),
            peptide_pad_length=config.get("max_length", 40) if config.get("compile_model", False) else 0,
            reverse_peptide=reverse_for_transformer, # Key change based on mode
            diffusion="InstaNovo+ Only" in mode_selection # Signal if input is for diffusion
        )
        dl = DataLoader(ds, batch_size=config.batch_size, num_workers=0, shuffle=False, collate_fn=collate_batch)

        # --- Run Prediction ---
        results_data = None
        output_headers = index_cols_present[:]

        if "InstaNovo Only" in mode_selection:
             output_headers.extend(["prediction", "log_probability", "delta_mass_ppm", "token_log_probabilities"])
             transformer_results = run_transformer_prediction(dl, config, transformer_decoder_selection)
             results_data = []
             metrics_calc = Metrics(RESIDUE_SET, config.isotope_error_range)
             for i, res in enumerate(transformer_results):
                 row_data = {}
                 if isinstance(res, ScoredSequence) and res.sequence:
                     row_data["prediction"] = "".join(res.sequence)
                     row_data["log_probability"] = f"{res.sequence_log_probability:.4f}"
                     row_data["token_log_probabilities"] = ", ".join(f"{p:.4f}" for p in res.token_log_probabilities)
                     try:
                         prec_mz = base_df_pd.loc[i, "precursor_mz"]
                         prec_ch = base_df_pd.loc[i, "precursor_charge"]
                         _, delta_mass_list = metrics_calc.matches_precursor(res.sequence, prec_mz, prec_ch)
                         min_abs_ppm = min(abs(p) for p in delta_mass_list) if delta_mass_list else float("nan")
                         row_data["delta_mass_ppm"] = f"{min_abs_ppm:.2f}"
                     except Exception as e:
                          logger.warning(f"Could not calculate delta mass for Tx prediction {i}: {e}")
                          row_data["delta_mass_ppm"] = "N/A"
                 else:
                     row_data.update({k: "N/A" for k in ["prediction", "log_probability", "delta_mass_ppm", "token_log_probabilities"]})
                     row_data["prediction"] = "" # Ensure empty string for failed preds
                     row_data["token_log_probabilities"] = ""
                 results_data.append(row_data)

        elif "InstaNovo+ Only" in mode_selection:
             output_headers.extend(["prediction", "log_probability", "delta_mass_ppm"])
             diffusion_results = run_diffusion_prediction(dl, config)
             results_data = []
             for res in diffusion_results:
                 row_data = {}
                 if isinstance(res, ScoredSequence) and res.sequence:
                     row_data["prediction"] = "".join(res.sequence)
                     row_data["log_probability"] = f"{res.sequence_log_probability:.4f}" # Avg loss
                     row_data["delta_mass_ppm"] = f"{res.mass_error:.2f}" if not np.isnan(res.mass_error) else "N/A" # ppm
                 else:
                     row_data.update({k: "N/A" for k in ["prediction", "log_probability", "delta_mass_ppm"]})
                     row_data["prediction"] = ""
                 results_data.append(row_data)

        elif "Refinement" in mode_selection:
             output_headers.extend([
                 "transformer_prediction", "transformer_log_probability",
                 "refined_prediction", "refined_log_probability", "refined_delta_mass_ppm"
             ])
             # Pass the selected transformer decoder to the refinement function
             results_data = run_refinement_prediction(dl, config, transformer_decoder_selection)
             for row in results_data:
                 # Format numbers after getting the list of dicts
                 row["transformer_log_probability"] = f"{row['transformer_log_probability']:.4f}" if isinstance(row['transformer_log_probability'], (float, int)) else "N/A"
                 row["refined_log_probability"] = f"{row['refined_log_probability']:.4f}" if isinstance(row['refined_log_probability'], (float, int)) else "N/A"
                 row["refined_delta_mass_ppm"] = f"{row['refined_delta_mass_ppm']:.2f}" if isinstance(row['refined_delta_mass_ppm'], (float, int)) and not np.isnan(row['refined_delta_mass_ppm']) else "N/A"


        else:
            raise ValueError(f"Unknown mode selection: {mode_selection}")


        # --- Combine, Save, Return ---
        logger.info("Combining results...")
        if results_data is None: raise gr.Error("Prediction did not produce results.")

        results_df = pl.DataFrame(results_data)
        # Ensure base_df_pd has unique index if using join, or just concat horizontally if order is guaranteed
        base_df_pl = pl.from_pandas(base_df_pd.reset_index(drop=True))

        # Simple horizontal concat assuming order is preserved by dataloader (shuffle=False)
        if len(base_df_pl) == len(results_df):
            final_df = pl.concat([base_df_pl, results_df], how="horizontal")
        else:
            logger.error(f"Length mismatch between base data ({len(base_df_pl)}) and results ({len(results_df)}). Cannot reliably combine.")
            # Fallback or error? Let's just use results for now, but log error.
            final_df = results_df # Display only results in case of mismatch

        logger.info(f"Saving full results to {output_csv_path}...")
        final_df.write_csv(output_csv_path)
        logger.info("Save complete.")

        # Select display columns - make sure they exist in final_df
        display_cols_final = [col for col in output_headers if col in final_df.columns]
        display_df = final_df.select(display_cols_final)

        logger.info("--- Prediction Request Complete ---")
        return display_df.to_pandas(), output_csv_path

    except Exception as e:
        logger.error(f"An error occurred during prediction: {e}", exc_info=True)
        if 'output_csv_path' in locals() and os.path.exists(output_csv_path):
            try:
                os.remove(output_csv_path)
                logger.info(f"Removed temporary file {output_csv_path}")
            except OSError:
                 logger.error(f"Failed to remove temporary file {output_csv_path}")
        raise gr.Error(f"Prediction failed: {e}")


# --- Gradio Interface ---
css = """
.gradio-container { font-family: sans-serif; }
.gr-button { color: white; border-color: black; background: black; }
footer { display: none !important; }
.logo-container img { margin-bottom: 1rem; }
.feedback { font-size: 0.9rem; color: gray; }
"""

with gr.Blocks(
    css=css, theme=gr.themes.Default(primary_hue="blue", secondary_hue="blue")
) as demo:
    gr.Markdown(
        """
        <div style="text-align: center;" class="logo-container">
          <img src='/gradio_api/file=assets/instanovo.svg' alt="InstaNovo Logo" width="300" style="display: block; margin: 0 auto;">
        </div>
        """,
        elem_classes="logo-container",
    )

    gr.Markdown(
        f"""
        # 🚀 _De Novo_ Peptide Sequencing with InstaNovo
        Upload your mass spectrometry data file (.mgf, .mzml, or .mzxml) and get peptide sequence predictions.
        Choose your prediction method and decoding options.

        **Note:** The InstaNovo+ model `{DIFFUSION_MODEL_ID}` is an alpha release.
        """
    )
    with gr.Row():
        with gr.Column(scale=1):
            input_file = gr.File(
                label="Upload Mass Spectrometry File (.mgf, .mzml, .mzxml)",
                file_types=[".mgf", ".mzml", ".mzxml"],
                scale=1
            )
            mode_selection = gr.Radio(
                [
                    "InstaNovo with InstaNovo+ refinement (Default, Recommended)",
                    "InstaNovo Only (Transformer)",
                    "InstaNovo+ Only (Diffusion, Alpha release)",
                ],
                label="Prediction Mode",
                value="InstaNovo with InstaNovo+ refinement (Default, Recommended)",
                scale=1
            )
            # Transformer decoder selection - visible for relevant modes
            transformer_decoder_selection = gr.Radio(
                [
                    "Greedy Search (Fast)",
                    "Knapsack Beam Search (Accurate, Slower)"
                ],
                label="Transformer Decoding Method",
                value="Greedy Search (Fast)",
                visible=True, # Start visible as default mode uses it
                interactive=True,
                scale=1
            )

            submit_btn = gr.Button("Predict Sequences", variant="primary")

            # --- Control Visibility & Choices ---
            def update_transformer_options(mode):
                # Show decoder selection if mode uses the transformer
                show_decoder = "InstaNovo+ Only" not in mode
                choices = ["Greedy Search (Fast)", "Knapsack Beam Search (Accurate, Slower)"]
                current_value = "Greedy Search (Fast)" # Default reset value
                return gr.update(visible=show_decoder, choices=choices, value=current_value)

            mode_selection.change(
                fn=update_transformer_options,
                inputs=mode_selection,
                outputs=transformer_decoder_selection,
            )


        with gr.Column(scale=2):
            output_df = gr.DataFrame(
                label="Prediction Results Preview",
                headers=["scan_number", "prediction", "log_probability", "delta_mass_ppm"]
            )
            output_file = gr.File(label="Download Full Results (CSV)")

    submit_btn.click(
        predict_peptides,
        inputs=[input_file, mode_selection, transformer_decoder_selection],
        outputs=[output_df, output_file],
    )

    gr.Examples(
        [
            ["assets/sample_spectra.mgf", "InstaNovo with InstaNovo+ refinement (Default, Recommended)", "Greedy Search (Fast)"],
            ["assets/sample_spectra.mgf", "InstaNovo with InstaNovo+ refinement (Default, Recommended)", "Knapsack Beam Search (Accurate, Slower)"],
            ["assets/sample_spectra.mgf", "InstaNovo Only (Transformer)", "Greedy Search (Fast)"],
            ["assets/sample_spectra.mgf", "InstaNovo Only (Transformer)", "Knapsack Beam Search (Accurate, Slower)"],
            ["assets/sample_spectra.mgf", "InstaNovo+ Only (Diffusion, Alpha release)", ""],
        ],
        inputs=[input_file, mode_selection, transformer_decoder_selection],
        # outputs=[output_df, output_file],
        cache_examples=False,
        label="Example Usage:",
    )

    gr.Markdown(
        f"""
         **Notes:**
         *   Predictions use `{TRANSFORMER_MODEL_ID}` (Transformer) and `{DIFFUSION_MODEL_ID}` (Diffusion, Alpha release).
         *   **Refinement Mode:** Runs initial prediction with the selected Transformer method (Greedy/Knapsack), then refines using InstaNovo+.
         *   **InstaNovo Only Mode:** Uses only the Transformer with the selected decoding method.
         *   **InstaNovo+ Only Mode:** Predicts directly using the Diffusion model (alpha version).
         *   `delta_mass_ppm` shows the lowest absolute precursor mass error (ppm) across isotopes 0-1 for the final sequence.
         *   Knapsack Beam Search requires a pre-computed knapsack file. If unavailable, the option will be disabled.
         *   Check logs for progress, especially for large files or slower methods.
         """,
         elem_classes="feedback"
    )

    with gr.Accordion("Application Logs", open=True):
        log_display = Log(log_file, dark=True, height=300)

    gr.Markdown(
        value="""
If you use InstaNovo in your research, please cite:

```bibtex
@article{eloff_kalogeropoulos_2025_instanovo,
	title        = {InstaNovo enables diffusion-powered de novo peptide sequencing in large-scale proteomics experiments},
	author       = {Kevin Eloff and Konstantinos Kalogeropoulos and Amandla Mabona and Oliver Morell and Rachel Catzel and
                    Esperanza Rivera-de-Torre and Jakob Berg Jespersen and Wesley Williams and Sam P. B. van Beljouw and
                    Marcin J. Skwark and Andreas Hougaard Laustsen and Stan J. J. Brouns and Anne Ljungars and Erwin M.
                    Schoof and Jeroen Van Goey and Ulrich auf dem Keller and Karim Beguir and Nicolas Lopez Carranza and
                    Timothy P. Jenkins},
	year         = 2025,
	month        = {Mar},
	day          = 31,
	journal      = {Nature Machine Intelligence},
	doi          = {10.1038/s42256-025-01019-5},
	url          = {https://www.nature.com/articles/s42256-025-01019-5}
}
""",
        show_copy_button=True,
        label="If you use InstaNovo in your research, please cite:"
    )

# --- Launch the App ---
if __name__ == "__main__":
    # https://www.gradio.app/guides/setting-up-a-demo-for-maximum-performance
    demo.queue(default_concurrency_limit=5)
    # Set share=True for temporary public link if running locally
    # Set server_name="0.0.0.0" to allow access from network if needed
    # demo.launch(server_name="0.0.0.0", server_port=7860)
    # For Hugging Face Spaces, just demo.launch() is usually sufficient
    demo.launch(debug=True, show_error=True)
    # demo.launch(share=True)  # For local testing with public URL