import os
import shutil
import subprocess
os.environ["GRADIO_ANALYTICS_ENABLED"] = "False"
import gradio as gr

from huggingface_hub import create_repo, HfApi
from huggingface_hub import snapshot_download
from huggingface_hub import whoami
from huggingface_hub import ModelCard

from gradio_huggingfacehub_search import HuggingfaceHubSearch

from apscheduler.schedulers.background import BackgroundScheduler

from textwrap import dedent

LLAMA_LIKE_ARCHS = ["MistralForCausalLM",]
HF_TOKEN = os.environ.get("HF_TOKEN")

def script_to_use(model_id, api):
    info = api.model_info(model_id)
    if info.config is None:
        return None
    arch = info.config.get("architectures", None)
    if arch is None:
        return None
    arch = arch[0]
    return "convert.py" if arch in LLAMA_LIKE_ARCHS else "convert-hf-to-gguf.py"

def split_upload_model(model_path, repo_id, oauth_token: gr.OAuthToken | None, split_max_tensors=256, split_max_size=None):
    if oauth_token.token is None:
        raise ValueError("You have to be logged in.")
    
    split_cmd = f"llama.cpp/gguf-split --split --split-max-tensors {split_max_tensors}"
    if split_max_size:
        split_cmd += f" --split-max-size {split_max_size}"
    split_cmd += f" {model_path} {model_path.split('.')[0]}"
    
    print(f"Split command: {split_cmd}") 
    
    result = subprocess.run(split_cmd, shell=True, capture_output=True, text=True)
    print(f"Split command stdout: {result.stdout}") 
    print(f"Split command stderr: {result.stderr}") 
    
    if result.returncode != 0:
        raise Exception(f"Error splitting the model: {result.stderr}")
    print("Model split successfully!")
     
    
    sharded_model_files = [f for f in os.listdir('.') if f.startswith(model_path.split('.')[0])]
    if sharded_model_files:
        print(f"Sharded model files: {sharded_model_files}")
        api = HfApi(token=oauth_token.token)
        for file in sharded_model_files:
            file_path = os.path.join('.', file)
            print(f"Uploading file: {file_path}")
            try:
                api.upload_file(
                    path_or_fileobj=file_path,
                    path_in_repo=file,
                    repo_id=repo_id,
                )
            except Exception as e:
                raise Exception(f"Error uploading file {file_path}: {e}")
    else:
        raise Exception("No sharded files found.")
    
    print("Sharded model has been uploaded successfully!")

def process_model(model_id, q_method, private_repo, split_model, split_max_tensors, split_max_size, oauth_token: gr.OAuthToken | None):
    if oauth_token.token is None:
        raise ValueError("You must be logged in to use GGUF-my-repo")
    model_name = model_id.split('/')[-1]
    fp16 = f"{model_name}.fp16.gguf"

    try:
        api = HfApi(token=oauth_token.token)

        dl_pattern = ["*.md", "*.json", "*.model"]

        pattern = (
            "*.safetensors"
            if any(
                file.path.endswith(".safetensors")
                for file in api.list_repo_tree(
                    repo_id=model_id,
                    recursive=True,
                )
            )
            else "*.bin"
        )

        dl_pattern += pattern

        api.snapshot_download(repo_id=model_id, local_dir=model_name, local_dir_use_symlinks=False, allow_patterns=dl_pattern)
        print("Model downloaded successfully!")
        print(f"Current working directory: {os.getcwd()}")
        print(f"Model directory contents: {os.listdir(model_name)}")

        conversion_script = script_to_use(model_id, api)
        fp16_conversion = f"python llama.cpp/{conversion_script} {model_name} --outtype f16 --outfile {fp16}"
        result = subprocess.run(fp16_conversion, shell=True, capture_output=True)
        print(result)
        if result.returncode != 0:
            raise Exception(f"Error converting to fp16: {result.stderr}")
        print("Model converted to fp16 successfully!")
        print(f"Converted model path: {fp16}")

        username = whoami(oauth_token.token)["name"]
        quantized_gguf_name = f"{model_name.lower()}-{q_method.lower()}.gguf"
        quantized_gguf_path = quantized_gguf_name
        quantise_ggml = f"./llama.cpp/quantize {fp16} {quantized_gguf_path} {q_method}"
        result = subprocess.run(quantise_ggml, shell=True, capture_output=True)
        if result.returncode != 0:
            raise Exception(f"Error quantizing: {result.stderr}")
        print(f"Quantized successfully with {q_method} option!")
        print(f"Quantized model path: {quantized_gguf_path}")

        # Create empty repo
        new_repo_url = api.create_repo(repo_id=f"{username}/{model_name}-{q_method}-GGUF", exist_ok=True, private=private_repo)
        new_repo_id = new_repo_url.repo_id
        print("Repo created successfully!", new_repo_url)

        try:
            card = ModelCard.load(model_id, token=oauth_token.token)
        except:
            card = ModelCard("")
        if card.data.tags is None:
            card.data.tags = []
        card.data.tags.append("llama-cpp")
        card.data.tags.append("gguf-my-repo")
        card.text = dedent(
            f"""
            # {new_repo_id}
            This model was converted to GGUF format from [`{model_id}`](https://huggingface.co/{model_id}) using llama.cpp via the ggml.ai's [GGUF-my-repo](https://huggingface.co/spaces/ggml-org/gguf-my-repo) space.
            Refer to the [original model card](https://huggingface.co/{model_id}) for more details on the model.
            ## Use with llama.cpp
            Install llama.cpp through brew.
            ```bash
            brew install ggerganov/ggerganov/llama.cpp
            ```
            Invoke the llama.cpp server or the CLI.
            CLI:
            ```bash
            llama-cli --hf-repo {new_repo_id} --model {quantized_gguf_name} -p "The meaning to life and the universe is"
            ```
            Server:
            ```bash
            llama-server --hf-repo {new_repo_id} --model {quantized_gguf_name} -c 2048
            ```
            Note: You can also use this checkpoint directly through the [usage steps](https://github.com/ggerganov/llama.cpp?tab=readme-ov-file#usage) listed in the Llama.cpp repo as well.
            ```
            git clone https://github.com/ggerganov/llama.cpp && \\
            cd llama.cpp && \\
            make && \\
            ./main -m {quantized_gguf_name} -n 128
            ```
            """
        )
        card.save(f"README.md")

        if split_model:
            split_upload_model(quantized_gguf_path, new_repo_id, oauth_token, split_max_tensors, split_max_size)
        else:
            try:
                print(f"Uploading quantized model: {quantized_gguf_path}")
                api.upload_file(
                    path_or_fileobj=quantized_gguf_path,
                    path_in_repo=quantized_gguf_name,
                    repo_id=new_repo_id,
                )
            except Exception as e:
                raise Exception(f"Error uploading quantized model: {e}")

        api.upload_file(
            path_or_fileobj=f"README.md",
            path_in_repo=f"README.md",
            repo_id=new_repo_id,
        )
        print(f"Uploaded successfully with {q_method} option!")

        return (
            f'Find your repo <a href=\'{new_repo_url}\' target="_blank" style="text-decoration:underline">here</a>',
            "llama.png",
        )
    except Exception as e:
        return (f"Error: {e}", "error.png")
    finally:
        shutil.rmtree(model_name, ignore_errors=True)
        print("Folder cleaned up successfully!")


# Create Gradio interface
with gr.Blocks() as demo:
    gr.Markdown("You must be logged in to use GGUF-my-repo.")
    gr.LoginButton(min_width=250)

    model_id_input = HuggingfaceHubSearch(
        label="Hub Model ID",
        placeholder="Search for model id on Huggingface",
        search_type="model",
    )

    q_method_input = gr.Dropdown(
        ["Q2_K", "Q3_K_S", "Q3_K_M", "Q3_K_L", "Q4_0", "Q4_K_S", "Q4_K_M", "Q5_0", "Q5_K_S", "Q5_K_M", "Q6_K", "Q8_0"],
        label="Quantization Method",
        info="GGML quantization type",
        value="Q4_K_M",
        filterable=False
    )

    private_repo_input = gr.Checkbox(
        value=False,
        label="Private Repo",
        info="Create a private repo under your username."
    )

    split_model_input = gr.Checkbox(
        value=False,
        label="Split Model",
        info="Shard the model using gguf-split."
    )

    split_max_tensors_input = gr.Number(
        value=256,
        label="Max Tensors per File",
        info="Maximum number of tensors per file when splitting model.",
        visible=False
    )

    split_max_size_input = gr.Textbox(
        label="Max File Size",
        info="Maximum file size when splitting model (--split-max-size). May leave empty to use the default.",
        visible=False
    )

    iface = gr.Interface(
        fn=process_model,
        inputs=[
            model_id_input,
            q_method_input,
            private_repo_input,
            split_model_input,
            split_max_tensors_input,
            split_max_size_input,
        ],
        outputs=[
            gr.Markdown(label="output"),
            gr.Image(show_label=False),
        ],
        title="Create your own GGUF Quants, blazingly fast ⚡!",
        description="The space takes an HF repo as an input, quantizes it and creates a Public repo containing the selected quant under your HF user namespace.",
    )

    def update_visibility(split_model):
        return gr.update(visible=split_model), gr.update(visible=split_model)

    split_model_input.change(
        fn=update_visibility,
        inputs=split_model_input,
        outputs=[split_max_tensors_input, split_max_size_input]
    )

def restart_space():
    HfApi().restart_space(repo_id="ggml-org/gguf-my-repo", token=HF_TOKEN, factory_reboot=True)

scheduler = BackgroundScheduler()
scheduler.add_job(restart_space, "interval", seconds=21600)
scheduler.start()

# Launch the interface
demo.queue(default_concurrency_limit=1, max_size=5).launch(debug=True)