"""
fetchers/derivatives.py — Fetches derivatives data from data_provider API.

Clean consumer: no direct ccxt dependency. Just HTTP GET /api/derivatives.
"""

from datetime import date as Date
from typing import Optional

import requests

from .base import BaseFetcher
from config import config


class DerivativesFetcher(BaseFetcher):
    """Fetches derivatives snapshot from data_provider /api/derivatives."""

    def __init__(self, provider_url: Optional[str] = None):
        super().__init__(timeout=15, max_retries=3)
        self.provider_url = provider_url or config.provider_url

    def fetch(self, target_date: Optional[Date] = None) -> list[dict]:
        """Fetch derivatives data. Returns list with one record dict."""
        url = f"{self.provider_url}/api/derivatives"
        params = {"symbol": config.btc_symbol}
        try:
            data = self._get(url, params=params)
            record = {
                "date": str(target_date or Date.today()),
                "symbol": config.btc_symbol,
                "funding_rate": data.get("funding_rate"),
                "open_interest": data.get("open_interest"),
                "oi_24h_change_pct": data.get("oi_change_pct"),
                "basis_annualised_pct": data.get("basis"),
                "source": "data_provider",
            }
            return [record]
        except Exception:
            return []

    def store(self, db_path: Optional[str] = None, records: Optional[list[dict]] = None) -> int:
        """Store derivatives records into SQLite."""
        import sqlite3
        db_path = db_path or config.db_path
        records = records or []
        conn = sqlite3.connect(db_path)
        count = 0
        for r in records:
            try:
                conn.execute("""
                    INSERT OR REPLACE INTO derivatives
                    (date, symbol, funding_rate, open_interest, oi_24h_change_pct,
                     long_liquidations, short_liquidations, basis_annualised_pct)
                    VALUES (?, ?, ?, ?, ?, NULL, NULL, ?)
                """, (
                    r["date"], r.get("symbol", config.btc_symbol),
                    r.get("funding_rate"), r.get("open_interest"),
                    r.get("oi_24h_change_pct"), r.get("basis_annualised_pct"),
                ))
                count += 1
            except Exception:
                continue
        conn.commit()
        conn.close()
        return count