from __future__ import annotations

import json
import uuid
from datetime import datetime
from pathlib import Path
from typing import List, Dict, Any

import gradio as gr
from huggingface_hub import CommitScheduler

# ------------------------------
# Config
# ------------------------------
DATASET_REPO_ID = "hugging-science/dataset-quest-index"  
COMMIT_EVERY_MIN = 2

LOCAL_SUBMISSIONS_DIR = Path("submissions")
LOCAL_SUBMISSIONS_DIR.mkdir(parents=True, exist_ok=True)
LOCAL_FILE = LOCAL_SUBMISSIONS_DIR / f"records_{uuid.uuid4().hex}.jsonl"

scheduler = CommitScheduler(
    repo_id=DATASET_REPO_ID,
    repo_type="dataset",
    folder_path=LOCAL_SUBMISSIONS_DIR,
    path_in_repo="data",
    every=COMMIT_EVERY_MIN,
)

# ------------------------------
# Utilities
# ------------------------------
def _now_iso() -> str:
    return datetime.utcnow().replace(microsecond=0).isoformat() + "Z"


def read_all_records() -> List[Dict[str, Any]]:
    records: List[Dict[str, Any]] = []
    for p in sorted(LOCAL_SUBMISSIONS_DIR.glob("*.jsonl")):
        try:
            with p.open("r", encoding="utf-8") as f:
                for line in f:
                    line = line.strip()
                    if not line:
                        continue
                    try:
                        records.append(json.loads(line))
                    except Exception:
                        pass
        except FileNotFoundError:
            pass
    return records


def append_record(record: Dict[str, Any]) -> None:
    LOCAL_FILE.parent.mkdir(parents=True, exist_ok=True)
    with LOCAL_FILE.open("a", encoding="utf-8") as f:
        f.write(json.dumps(record, ensure_ascii=False) + "\n")


def filter_records(records: List[Dict[str, Any]], field: str | None, search: str | None) -> List[Dict[str, Any]]:
    def match(rec: Dict[str, Any]) -> bool:
        ok = True
        if field and field != "All":
            ok = ok and (rec.get("field") == field)
        if search:
            s = search.lower()
            hay = " ".join(
                str(rec.get(k, "")) for k in ["dataset_name", "dataset_url", "description", "user", "field"]
            ).lower()
            ok = ok and (s in hay)
        return ok

    return [r for r in records if match(r)]


# ------------------------------
# App logic
# ------------------------------
SIZE_UNITS = ["KB", "MB", "GB", "TB"]


def submit_entry(
    dataset_name: str,
    dataset_url: str,
    description: str,
    size_value: float,
    size_unit: str,
    field: str,
    profile: gr.OAuthProfile | None,
):
    errors = []
    if not dataset_name.strip():
        errors.append("Dataset name is required.")
    if not dataset_url.strip() or not dataset_url.startswith(("http://", "https://", "https://huggingface.co/")):
        errors.append("Dataset URL must be an http(s) link.")
    if size_value is None or size_value < 0:
        errors.append("Approximate size must be a non-negative number.")
    if not field.strip():
        errors.append("Please provide a field.")
    
    # Check for existing dataset URL and name
    existing_records = read_all_records()
    for record in existing_records:
        if record.get("dataset_url", "").strip().lower() == dataset_url.strip().lower():
            errors.append(f"Dataset URL already exists: {record.get('dataset_url')}")
        if record.get("dataset_name", "").strip().lower() == dataset_name.strip().lower():
            errors.append(f"Dataset name already exists: {record.get('dataset_name')}")

    if errors:
        return gr.update(value=f"Submission failed:\n- " + "\n- ".join(errors), visible=True), gr.update(visible=False)

    user_display = profile.name if profile else "anonymous"
    user_handle = getattr(profile, "preferred_username", None) if profile else None

    record = {
        "id": uuid.uuid4().hex,
        "created_at": _now_iso(),
        "dataset_name": dataset_name.strip(),
        "dataset_url": dataset_url.strip(),
        "description": description.strip(),
        "approx_size": float(size_value),
        "size_unit": size_unit,
        "field": field.strip(),
        "user": user_handle or user_display,
    }

    append_record(record)
    ok = f"Thanks, {user_display}. Your entry has been saved locally and will sync to the Hub within ~{COMMIT_EVERY_MIN} minutes."
    updated = read_all_records()
    rows = [
        [r["dataset_name"], f'<a href="{r["dataset_url"]}" target="_blank">{r["dataset_url"]}</a>', r["description"], f"{r['approx_size']} {r['size_unit']}", r["field"], r["user"], r["created_at"]]
        for r in updated
    ]
    return gr.update(value=ok, visible=True), rows


def refresh_table(field: str, search: str):
    data = read_all_records()
    data = filter_records(data, field, search)
    rows = [
        [r["dataset_name"], f'<a href="{r["dataset_url"]}" target="_blank">{r["dataset_url"]}</a>', r["description"], f"{r['approx_size']} {r['size_unit']}", r["field"], r["user"], r["created_at"]]
        for r in data
    ]
    return rows


# ------------------------------
# UI
# ------------------------------
with gr.Blocks(title="Community Dataset Index", css=".wrap {max-width: 1200px; margin: 0 auto}") as demo:
    gr.Markdown("# Community Dataset Index\nContribute datasets with a short description. Sign in to record your HF username.")
    gr.LoginButton()

    with gr.Row(elem_classes=["wrap"]):
        with gr.Column(scale=1):
            gr.Markdown("### Submit a dataset")
            name = gr.Textbox(label="Dataset name", placeholder="e.g. The Pile")
            url = gr.Textbox(label="Dataset URL (HF, website or paper)", placeholder="https://huggingface.co/datasets/... or https://...")
            desc = gr.Textbox(label="Short description", lines=4)
            with gr.Row():
                size_val = gr.Number(label="Approx. size", minimum=0, value=0)
                size_unit = gr.Dropdown(SIZE_UNITS, value="GB", label="Unit")
            field = gr.Textbox(label="Field (e.g. PDEs, multi-omics, single-cell, catalysts, etc.)")
            submit = gr.Button("Submit", variant="primary")
            notice = gr.Markdown(visible=False)
        with gr.Column(scale=2):
            gr.Markdown("### Browse & filter")
            with gr.Row():
                field_filter = gr.Textbox(label="Field filter (leave blank for all)")
                search = gr.Textbox(label="Search", placeholder="Search name, URL, description, user…")
                refresh = gr.Button("Refresh")
            table = gr.Dataframe(
                headers=["Name", "URL", "Description", "Size", "Field", "User", "Created"],
                datatype=["str", "html", "str", "str", "str", "str", "str"],
                interactive=False,
                wrap=True,
            )

    submit.click(
        submit_entry,
        inputs=[name, url, desc, size_val, size_unit, field],
        outputs=[notice, table],
        show_progress="minimal",
    )

    refresh.click(refresh_table, inputs=[field_filter, search], outputs=table)
    field_filter.change(refresh_table, inputs=[field_filter, search], outputs=table)
    search.submit(refresh_table, inputs=[field_filter, search], outputs=table)

    demo.load(lambda: refresh_table("", ""), inputs=None, outputs=table)


if __name__ == "__main__":
    demo.launch()