import os
import shutil
from tempfile import TemporaryDirectory
from typing import List, Optional, Tuple, Dict, Any
from huggingface_hub import (
    CommitOperationAdd,
    HfApi,
    ModelCard,
    Discussion,
    CommitInfo,
)
from huggingface_hub.file_download import repo_folder_name
from optimum.exporters.neuron import main_export
from optimum.exporters.tasks import TasksManager

SPACES_URL = "https://huggingface.co/spaces/optimum/neuron-export"

def get_default_compiler_kwargs() -> Dict[str, Any]:
    """
    Get default compiler kwargs for neuron export.
    Based on infer_compiler_kwargs function from the original code.
    """
    return {
        "auto_cast": None,  # Default to None (equivalent to "none")
        "auto_cast_type": None,
        # Add other compiler-specific kwargs if needed
        # "disable_fast_relayout": False,  # Only available for certain compilers
        # "disable_fallback": False,       # Only available for certain compilers
    }

def previous_pr(api: "HfApi", model_id: str, pr_title: str) -> Optional["Discussion"]:
    try:
        discussions = api.get_repo_discussions(repo_id=model_id)
    except Exception:
        return None
    for discussion in discussions:
        if (
            discussion.status == "open"
            and discussion.is_pull_request
            and discussion.title == pr_title
        ):
            return discussion
    return None

def export_and_git_add(model_id: str, task: str, folder: str, token: str) -> List:
    # Get default compiler kwargs
    compiler_kwargs = get_default_compiler_kwargs()
    
    # Infer task if it's "auto"
    if task == "auto":
        try:
            task = TasksManager.infer_task_from_model(model_id)
        except Exception as e:
            raise Exception(f"Could not infer task for model {model_id}: {e}")
    
    print(f"Exporting model {model_id} with task: {task}")
    
    try:
        # Call main_export with all required parameters
        main_export(
            model_name_or_path=model_id,
            output=folder,
            compiler_kwargs=compiler_kwargs,
            task=task,
            token=token,
            # Add other commonly needed parameters with sensible defaults
            torch_dtype=None,  # Let it use model's default
            dynamic_batch_size=False,
            do_validation=False,  # Disable validation for now to avoid issues
            trust_remote_code=False,
            force_download=False,
            local_files_only=False,
            # Default optimization level (O2 is the default from original code)
            optlevel="2",
            # Other defaults
            tensor_parallel_size=1,
            disable_neuron_cache=False,
            inline_weights_to_neff=True,
            output_attentions=False,
            output_hidden_states=False,
            # Add input shapes for common models
            batch_size=1,
            sequence_length=128,
        )
        print(f"Export completed successfully")
    except Exception as e:
        print(f"Export failed with error: {e}")
        raise
    
    operations = [
        CommitOperationAdd(
            path_in_repo=os.path.join("neuron", file_name),
            path_or_fileobj=os.path.join(folder, file_name),
        )
        for file_name in os.listdir(folder)
        if os.path.isfile(os.path.join(folder, file_name))  # Only add files, not directories
    ]
    
    try:
        card = ModelCard.load(model_id, token=token)
        if card.data.tags is None:
            card.data.tags = []
        if "neuron" not in card.data.tags:
            card.data.tags.append("neuron")
        card.save(os.path.join(folder, "README.md"))
        operations.append(
            CommitOperationAdd(
                path_in_repo="README.md", 
                path_or_fileobj=os.path.join(folder, "README.md")
            )
        )
    except Exception as e:
        print(f"Warning: Could not update model card: {e}")
        pass
    
    return operations

def convert(
    api: "HfApi",
    model_id: str,
    task: str,
    force: bool = False,
    token: str = None,
) -> Tuple[str, "CommitInfo"]:
    pr_title = "Adding Neuron-optimized model files"
    info = api.model_info(model_id, token=token)
    filenames = set(s.rfilename for s in info.siblings)
    requesting_user = api.whoami(token=token)["name"]
        
    with TemporaryDirectory() as d:
        folder = os.path.join(d, repo_folder_name(repo_id=model_id, repo_type="models"))
        os.makedirs(folder, exist_ok=True)
        new_pr = None
        
        try:
            pr = previous_pr(api, model_id, pr_title)
            
            if any(fname.startswith("neuron/") for fname in filenames) and not force:
                raise Exception(
                    f"Model {model_id} already has Neuron files, skipping export."
                )
            elif pr is not None and not force:
                url = f"https://huggingface.co/{model_id}/discussions/{pr.num}"
                new_pr = pr
                raise Exception(
                    f"Model {model_id} already has an open PR: [{url}]({url})"
                )
            else:
                operations = export_and_git_add(model_id, task, folder, token=token)
                
                if not operations:
                    raise Exception("No files were generated during export")
                
                commit_description = f"""
🤖 Neuron Export Bot: On behalf of [{requesting_user}](https://huggingface.co/{requesting_user}), adding AWS Neuron-optimized model files.

Neuron-optimized models can achieve high-performance inference on AWS Inferentia and Trainium chips. Learn more:
- [AWS Neuron Documentation](https://awsdocs-neuron.readthedocs-hosted.com)
- [🤗 Optimum Neuron Guide](https://huggingface.co/docs/optimum-neuron/index)
"""
                
                new_pr = api.create_commit(
                    repo_id=model_id,
                    operations=operations,
                    commit_message=pr_title,
                    commit_description=commit_description,
                    create_pr=True,
                    token=token,
                )
                
        except Exception as e:
            # Clean up folder before re-raising
            if os.path.exists(folder):
                shutil.rmtree(folder, ignore_errors=True)
            print(f"Conversion failed with error: {e}")  # Print the actual error
            return "1", str(e)  # Return error code and message
        
        finally:
            # Ensure cleanup
            if os.path.exists(folder):
                shutil.rmtree(folder, ignore_errors=True)
    
    return "0", new_pr