import os
import csv
import gradio as gr
from gradio import components
from huggingface_hub import Repository, hf_hub_download
from datetime import datetime

DATASET_REPO_URL = "https://huggingface.co/datasets/sjw/data.csv"
DATASET_REPO_ID = "sjw/data.csv"
DATA_FILENAME = "data.csv"
DATA_DIRNAME = "data"
DATA_FILE = os.path.join(DATA_DIRNAME, DATA_FILENAME)
HF_TOKEN = os.environ.get("HF_TOKEN")

# overriding/appending to the gradio template
SCRIPT = """
<script>
if (!window.hasBeenRun) {
    window.hasBeenRun = true;
    console.log("should only happen once");
    document.querySelector("button.submit").click();
}
</script>
"""

try:
    hf_hub_download(
        repo_id=DATASET_REPO_ID,
        filename=DATA_FILENAME,
        cache_dir=DATA_DIRNAME
    )
except:
    print("file not found")

repo = Repository(
    local_dir=DATA_DIRNAME, clone_from=DATASET_REPO_URL, use_auth_token=HF_TOKEN
)

def generate_html() -> str:
    with open(DATA_FILE) as csvfile:
        reader = csv.DictReader(csvfile)
        rows = []
        for row in reader:
            rows.append(row)
        rows.reverse()
        if len(rows) == 0:
            return "no messages yet"
        else:
            html = "<div class='chatbot'>"
            for row in rows:
                html += "<div>"
                html += f"<span>{row['name']}</span>"
                html += f"<span class='message'>{row['message']}</span>"
                html += "</div>"
            html += "</div>"
            return html

def store_message(name: str, message: str):
    if name and message:
        with open(DATA_FILE, "a") as csvfile:
            writer = csv.DictWriter(csvfile, fieldnames=["name", "message", "time"])
            writer.writerow(
                {"name": name, "message": message, "time": str(datetime.now())}
            )
        commit_url = repo.push_to_hub()
    return generate_html()

iface = gr.Interface(
    store_message,
    [
        components.Textbox(placeholder="Your name"),
        components.Textbox(placeholder="Your message", lines=2),
    ],
    "html",
    css="""
    .message {background-color:cornflowerblue;color:white; padding:4px;margin:4px;border-radius:4px; }
    """,
    title="Reading/writing to a HuggingFace dataset repo from Spaces",
    description=f"This is a demo of how to do simple *shared data persistence* in a Gradio Space, backed by a dataset repo.",
    article=f"The dataset repo is [{DATASET_REPO_URL}]({DATASET_REPO_URL})",
    allow_flagging="never"
)

iface.launch()