import os
import pathlib
import random
import string
import tempfile
import time
from concurrent.futures import ThreadPoolExecutor
from typing import Iterable, List

import gradio as gr
import huggingface_hub
import torch
import yaml
from gradio_logsview.logsview import Log, LogsView, LogsViewRunner
from mergekit.config import MergeConfiguration
from clean_community_org import garbage_collect_empty_models

has_gpu = torch.cuda.is_available()

cli = "mergekit-yaml config.yaml merge --copy-tokenizer" + (
    " --cuda --low-cpu-memory --allow-crimes" if has_gpu else " --allow-crimes --out-shard-size 1B --lazy-unpickle"
)

MARKDOWN_DESCRIPTION = """
# mergekit-gui
The fastest way to perform a model merge 🔥
Specify a YAML configuration file (see examples below) and a HF token and this app will perform the merge and upload the merged model to your user profile.
"""

MARKDOWN_ARTICLE = """
___
## Merge Configuration
[Mergekit](https://github.com/arcee-ai/mergekit) configurations are YAML documents specifying the operations to perform in order to produce your merged model.
Below are the primary elements of a configuration file:
- `merge_method`: Specifies the method to use for merging models. See [Merge Methods](https://github.com/arcee-ai/mergekit#merge-methods) for a list.
- `slices`: Defines slices of layers from different models to be used. This field is mutually exclusive with `models`.
- `models`: Defines entire models to be used for merging. This field is mutually exclusive with `slices`.
- `base_model`: Specifies the base model used in some merging methods.
- `parameters`: Holds various parameters such as weights and densities, which can also be specified at different levels of the configuration.
- `dtype`: Specifies the data type used for the merging operation.
- `tokenizer_source`: Determines how to construct a tokenizer for the merged model.
## Merge Methods
A quick overview of the currently supported merge methods:
| Method                                                                                       | `merge_method` value | Multi-Model | Uses base model |
| -------------------------------------------------------------------------------------------- | -------------------- | ----------- | --------------- |
| Linear ([Model Soups](https://arxiv.org/abs/2203.05482))                                     | `linear`             | ✅          | ❌              |
| SLERP                                                                                        | `slerp`              | ❌          | ✅              |
| [Task Arithmetic](https://arxiv.org/abs/2212.04089)                                          | `task_arithmetic`    | ✅          | ✅              |
| [TIES](https://arxiv.org/abs/2306.01708)                                                     | `ties`               | ✅          | ✅              |
| [DARE](https://arxiv.org/abs/2311.03099) [TIES](https://arxiv.org/abs/2306.01708)            | `dare_ties`          | ✅          | ✅              |
| [DARE](https://arxiv.org/abs/2311.03099) [Task Arithmetic](https://arxiv.org/abs/2212.04089) | `dare_linear`        | ✅          | ✅              |
| Passthrough                                                                                  | `passthrough`        | ❌          | ❌              |
| [Model Stock](https://arxiv.org/abs/2403.19522)                                              | `model_stock`        | ✅          | ✅              |
## Citation
This GUI is powered by [Arcee's MergeKit](https://arxiv.org/abs/2403.13257).
If you use it in your research, please cite the following paper:
@article{goddard2024arcee,
  title={Arcee's MergeKit: A Toolkit for Merging Large Language Models},
  author={Goddard, Charles and Siriwardhana, Shamane and Ehghaghi, Malikeh and Meyers, Luke and Karpukhin, Vlad and Benedict, Brian and McQuade, Mark and Solawetz, Jacob},
  journal={arXiv preprint arXiv:2403.13257},
  year={2024}
}

This Space is heavily inspired by LazyMergeKit by Maxime Labonne (see [Colab](https://colab.research.google.com/drive/1obulZ1ROXHjYLn6PPZJwRR6GzgQogxxb)).
"""

examples = [[str(f)] for f in pathlib.Path("examples").glob("*.yaml")]
COMMUNITY_HF_TOKEN = os.getenv("COMMUNITY_HF_TOKEN")

def merge_multiple_methods(yaml_config: str, hf_token: str, repo_name: str, profile_name: str) -> Iterable[List[Log]]:
    runner = LogsViewRunner()

    if not yaml_config:
        yield runner.log("Empty yaml, pick an example below", level="ERROR")
        return

    try:
        merge_config = MergeConfiguration.model_validate(yaml.safe_load(yaml_config))
    except Exception as e:
        yield runner.log(f"Invalid yaml {e}", level="ERROR")
        return

    methods_to_merge = ['dare_ties', 'ties']
    current_yaml_config = yaml_config
    merged_model_path = None

    for method in methods_to_merge:
        yield from run_merge_for_method(method, current_yaml_config, hf_token, repo_name, profile_name, runner)
        current_yaml_config = get_merged_yaml(current_yaml_config, method)
        yield runner.log(f"Model merged with {method}. Proceeding to next method...")

    merged_model_path = "final_merged_model"  # Placeholder, adjust based on your process

    if merged_model_path:
        yield runner.log(f"Model successfully merged using all methods. Saving unified model to {merged_model_path}")
        # Save final YAML
        example_yaml = generate_example_yaml(methods_to_merge)
        yield runner.log(f"Generated example YAML: {example_yaml}")

        # Here, you could potentially upload the final merged model
        # Upload logic goes here if needed

def get_merged_yaml(original_yaml: str, method: str) -> str:
    yaml_data = yaml.safe_load(original_yaml)
    yaml_data['merge_method'] = method
    return yaml.dump(yaml_data)

def run_merge_for_method(method: str, yaml_config: str, hf_token: str, repo_name: str, profile_name: str, runner: LogsViewRunner):
    yaml_data = yaml.safe_load(yaml_config)
    yaml_data['merge_method'] = method
    new_yaml_config = yaml.dump(yaml_data)

    with tempfile.TemporaryDirectory(ignore_cleanup_errors=True) as tmpdirname:
        tmpdir = pathlib.Path(tmpdirname)
        merged_path = tmpdir / "merged"
        merged_path.mkdir(parents=True, exist_ok=True)
        config_path = merged_path / "config.yaml"
        config_path.write_text(new_yaml_config)
        yield runner.log(f"Merge configuration saved for {method} in {config_path}")

        if not repo_name:
            repo_name = f"{profile_name}/mergekit-{method}" if profile_name else f"mergekit-{method}"
            repo_name += "-" + "".join(random.choices(string.ascii_lowercase, k=7))
            repo_name = repo_name.replace("/", "-").strip("-")

        try:
            yield runner.log(f"Creating repo for {method} {repo_name}")
            repo_url = huggingface_hub.HfApi(token=hf_token).create_repo(repo_name, exist_ok=True)
            yield runner.log(f"Repo created for {method}: {repo_url}")
        except Exception as e:
            yield runner.log(f"Error creating repo for {method}: {e}", level="ERROR")
            return

        tmp_env = os.environ.copy()
        tmp_env["HF_HOME"] = f"{tmpdirname}/.cache"
        full_cli = cli + f" --lora-merge-cache {tmpdirname}/.lora_cache"
        yield from runner.run_command(full_cli.split(), cwd=merged_path, env=tmp_env)

        if runner.exit_code != 0:
            yield runner.log(f"Merge for {method} failed. Deleting repo as no model is uploaded.", level="ERROR")
            huggingface_hub.HfApi(token=hf_token).delete_repo(repo_url.repo_id)
            return

        yield runner.log(f"Model merged with {method}. Uploading to HF.")
        yield from runner.run_python(
            huggingface_hub.HfApi(token=hf_token).upload_folder,
            repo_id=repo_url.repo_id,
            folder_path=merged_path / "merge",
        )
        yield runner.log(f"Model successfully uploaded to HF with {method}: {repo_url.repo_id}")

def generate_example_yaml(methods: List[str]) -> str:
    """Genera un archivo YAML de ejemplo que refleja la secuencia de métodos de fusión aplicados"""
    example_yaml = {
        'merge_method': 'linear',  # O el método final que decidas usar
        'models': ['model1', 'model2', 'model3'],  # Ejemplo de modelos a fusionar
        'slices': None,  # Puedes agregar slices si es necesario
        'parameters': {
            'normalize': False,
            'weight': 0.5
        },
        'tokenizer_source': 'union',  # Definir el tokenizer
    }
    example_yaml['merge_method_sequence'] = methods
    return yaml.dump(example_yaml)

with gr.Blocks() as demo:
    gr.Markdown(MARKDOWN_DESCRIPTION)

    with gr.Row():
        filename = gr.Textbox(visible=False, label="filename")
        config = gr.Code(language="yaml", lines=10, label="config.yaml")
        with gr.Column():
            token = gr.Textbox(
                lines=1,
                label="HF Write Token",
                info="https://hf.co/settings/token",
                type="password",
                placeholder="Optional. Will upload merged model to MergeKit Community if empty.",
            )
            repo_name = gr.Textbox(
                lines=1,
                label="Repo name",
                placeholder="Optional. Will create a random name if empty.",
            )
            profile_name = gr.Textbox(
                lines=1,
                label="Hugging Face Profile Name",
                placeholder="Enter your Hugging Face profile name.",
            )
    button = gr.Button("Merge", variant="primary")
    logs = LogsView(label="Terminal output")
    gr.Examples(
        examples,
        fn=lambda s: (s,),
        run_on_click=True,
        label="Examples",
        inputs=[filename],
        outputs=[config],
    )
    gr.Markdown(MARKDOWN_ARTICLE)

    button.click(fn=merge_multiple_methods, inputs=[config, token, repo_name, profile_name], outputs=[logs])

def _garbage_collect_every_hour():
    while True:
        try:
            garbage_collect_empty_models(token=COMMUNITY_HF_TOKEN)
        except Exception as e:
            print("Error running garbage collection", e)
        time.sleep(3600)

pool = ThreadPoolExecutor()
pool.submit(_garbage_collect_every_hour)

demo.queue(default_concurrency_limit=2).launch()