"""
Shared bootstrap helpers for the SolarWine Streamlit app.
Cached data loaders, AI/IMS health checks, and common utilities.
"""

from __future__ import annotations

import base64
import threading

import streamlit as st

_BRAND_GREEN = "#00BD3E"
_BRAND_DARK = "#1A1A1A"

try:
    import plotly.express
    import plotly.graph_objects
    from plotly.subplots import make_subplots
    _HAS_PLOTLY = True
except ImportError:
    _HAS_PLOTLY = False

from pathlib import Path

import pandas as pd

# Threading state for IMS background refresh (shared with app.py via module-level vars)
_IMS_REFRESH_LOCK = threading.Lock()
_IMS_REFRESH_STARTED = False
_IMS_REFRESH_STATUS: dict = {"ok": None, "error": None, "running": False}


@st.cache_data
def load_labels(path: str) -> pd.DataFrame:
    return pd.read_csv(path, index_col=0, parse_dates=True)


@st.cache_data
def load_metrics(path: str) -> pd.DataFrame:
    return pd.read_csv(path)


def _check_ai_health_impl() -> dict:
    """Actual Gemini ping; cached so we only run once."""
    from src.genai_utils import get_genai_client

    try:
        client = get_genai_client()
    except Exception as exc:  # noqa: BLE001
        return {"ok": False, "error": f"client init failed: {exc}"}
    try:
        resp = client.models.generate_content(
            model="gemini-2.5-flash",
            contents="ping",
        )
        text = getattr(resp, "text", "") or ""
        return {"ok": bool(text.strip()), "error": None}
    except Exception as exc:  # noqa: BLE001
        return {"ok": False, "error": f"generate_content failed: {exc}"}


@st.cache_resource(show_spinner=False)
def _cached_ai_ping() -> dict:
    """Cached Gemini health check (used by check_ai_health with timeout)."""
    return _check_ai_health_impl()


def check_ai_health(timeout_seconds: float = 1.5) -> dict:
    """
    Lightweight startup validation that Gemini is reachable.
    Waits at most timeout_seconds so app load stays under ~5s.

    Returns a dict with:
      - ok: bool
      - error: str | None
    """
    from concurrent.futures import ThreadPoolExecutor, TimeoutError as FuturesTimeoutError

    with ThreadPoolExecutor(max_workers=1) as pool:
        future = pool.submit(_cached_ai_ping)
        try:
            return future.result(timeout=timeout_seconds)
        except FuturesTimeoutError:
            return {"ok": False, "error": "Health check timed out. Try refreshing."}


def _run_ims_refresh(days: int = 7) -> None:
    """Background worker to refresh IMS cache without blocking the UI."""
    from datetime import date, timedelta

    from src.ims_client import IMSClient

    global _IMS_REFRESH_STATUS

    try:
        ims = IMSClient()
    except Exception as exc:  # noqa: BLE001
        _IMS_REFRESH_STATUS = {
            "ok": False,
            "error": f"IMS init failed: {exc}",
            "running": False,
        }
        return

    try:
        today = date.today()
        start = (today - timedelta(days=days)).strftime("%Y-%m-%d")
        end = today.strftime("%Y-%m-%d")
        df = ims.fetch_and_cache(start, end)
        if df.empty:
            _IMS_REFRESH_STATUS = {
                "ok": False,
                "error": "IMS returned no data for the requested range.",
                "running": False,
            }
        else:
            _IMS_REFRESH_STATUS = {"ok": True, "error": None, "running": False}
    except Exception as exc:  # noqa: BLE001
        _IMS_REFRESH_STATUS = {
            "ok": False,
            "error": f"IMS fetch_and_cache failed: {exc}",
            "running": False,
        }


def ensure_ims_refresh_background(days: int = 7) -> dict:
    """
    Kick off IMS cache refresh in a background thread if not already started.

    Returns the latest known status dict without blocking page load.
    """
    global _IMS_REFRESH_STARTED, _IMS_REFRESH_STATUS
    with _IMS_REFRESH_LOCK:
        if not _IMS_REFRESH_STARTED:
            _IMS_REFRESH_STARTED = True
            _IMS_REFRESH_STATUS = {"ok": None, "error": None, "running": True}
            t = threading.Thread(target=_run_ims_refresh, args=(days,), daemon=True)
            t.start()
    return dict(_IMS_REFRESH_STATUS)


def img_to_base64(path: Path) -> str:
    return base64.b64encode(path.read_bytes()).decode()


def now_israel():
    from datetime import datetime

    try:
        from zoneinfo import ZoneInfo

        tz = ZoneInfo("Asia/Jerusalem")
    except ImportError:
        import datetime as _dt

        tz = _dt.timezone(_dt.timedelta(hours=2))  # fallback UTC+2
    return datetime.now(tz)