from fastapi import APIRouter, UploadFile, File, BackgroundTasks
from fastapi import Depends, HTTPException, status
from starlette.responses import StreamingResponse

from pydantic import BaseModel

from utils.misc import calculate_sha256
import requests


import os
import asyncio
import json
from config import OLLAMA_API_BASE_URL


router = APIRouter()


class UploadBlobForm(BaseModel):
    filename: str


from urllib.parse import urlparse


def parse_huggingface_url(hf_url):
    # Parse the URL
    parsed_url = urlparse(hf_url)

    # Get the path and split it into components
    path_components = parsed_url.path.split("/")

    # Extract the desired output
    user_repo = "/".join(path_components[1:3])
    model_file = path_components[-1]

    return [user_repo, model_file]


def download_file_stream(url, file_path, chunk_size=1024 * 1024):
    done = False

    if os.path.exists(file_path):
        current_size = os.path.getsize(file_path)
    else:
        current_size = 0

    headers = {"Range": f"bytes={current_size}-"} if current_size > 0 else {}

    with requests.get(url, headers=headers, stream=True) as response:
        total_size = int(response.headers.get("content-length", 0)) + current_size

        with open(file_path, "ab") as file:
            for data in response.iter_content(chunk_size=chunk_size):
                current_size += len(data)
                file.write(data)

                done = current_size == total_size

                progress = round((current_size / total_size) * 100, 2)
                yield f'data: {{"progress": {progress}, "current": {current_size}, "total": {total_size}}}\n\n'


@router.get("/download")
async def download(
    url: str = "https://huggingface.co/TheBloke/stablelm-zephyr-3b-GGUF/resolve/main/stablelm-zephyr-3b.Q2_K.gguf",
):
    user_repo, model_file = parse_huggingface_url(url)

    os.makedirs("./uploads", exist_ok=True)
    file_path = os.path.join("./uploads", f"{model_file}")

    return StreamingResponse(
        download_file_stream(url, file_path), media_type="text/event-stream"
    )


@router.post("/upload")
async def upload(file: UploadFile = File(...)):
    os.makedirs("./uploads", exist_ok=True)
    file_path = os.path.join("./uploads", file.filename)

    async def file_write_stream():
        total = 0
        total_size = file.size
        chunk_size = 1024 * 1024

        done = False
        try:
            with open(file_path, "wb+") as f:
                while True:
                    chunk = file.file.read(chunk_size)
                    if not chunk:
                        break
                    f.write(chunk)
                    total += len(chunk)
                    done = total_size == total

                    res = {
                        "total": total_size,
                        "uploaded": total,
                    }

                    yield f"data: {json.dumps(res)}\n\n"

                if done:
                    f.seek(0)
                    hashed = calculate_sha256(f)
                    f.seek(0)

                    url = f"{OLLAMA_API_BASE_URL}/blobs/sha256:{hashed}"
                    response = requests.post(url, data=f)

                    if response.ok:
                        res = {
                            "done": done,
                            "blob": f"sha256:{hashed}",
                        }
                        os.remove(file_path)

                        yield f"data: {json.dumps(res)}\n\n"
                    else:
                        raise "Ollama: Could not create blob, Please try again."

        except Exception as e:
            res = {"error": str(e)}
            yield f"data: {json.dumps(res)}\n\n"

    return StreamingResponse(file_write_stream(), media_type="text/event-stream")