#!/usr/bin/env python3
"""Coinglass data connector — funding rates, open interest, long/short ratios.

Uses the free fapi.coinglass.com internal API where available.
Some endpoints may return empty data without authentication.
Set COINGLASS_API_KEY env var for authenticated access to open-api.coinglass.com.
"""

import argparse
import json
import os
import sys
from typing import Any

import requests

FREE_BASE = "https://fapi.coinglass.com/api"
AUTH_BASE = "https://open-api.coinglass.com/public/v2"
TIMEOUT = 30


def _free_get(path: str, params: dict | None = None) -> Any:
    headers = {
        "User-Agent": "Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36",
        "Referer": "https://www.coinglass.com/",
    }
    r = requests.get(f"{FREE_BASE}/{path}", params=params, headers=headers, timeout=TIMEOUT)
    r.raise_for_status()
    data = r.json()
    if data.get("code") == "0" or data.get("success"):
        return data.get("data", [])
    raise ValueError(f"API error: {data.get('msg', 'unknown')}")


def _auth_get(path: str, params: dict | None = None) -> Any:
    key = os.environ.get("COINGLASS_API_KEY")
    if not key:
        raise EnvironmentError("COINGLASS_API_KEY not set. Get one at https://www.coinglass.com/pricing")
    headers = {"coinglassSecret": key}
    r = requests.get(f"{AUTH_BASE}/{path}", params=params, headers=headers, timeout=TIMEOUT)
    r.raise_for_status()
    data = r.json()
    if data.get("success") or data.get("code") == "0":
        return data.get("data", [])
    raise ValueError(f"API error: {data.get('msg', 'unknown')}")


# ── Data fetchers ───────────────────────────────────────────────────────────

def get_funding_rates() -> list[dict]:
    """Funding rates across exchanges."""
    try:
        data = _free_get("fundingRate/v2/home")
        if data:
            return data
    except Exception:
        pass
    return _auth_get("funding")


def get_open_interest() -> list[dict]:
    """Aggregated open interest data."""
    try:
        data = _free_get("openInterest/v3/home")
        if data:
            return data
    except Exception:
        pass
    return _auth_get("open_interest")


def get_long_short_ratio() -> list[dict]:
    """Global long/short account ratios."""
    try:
        data = _free_get("futures/longShort/v2/home")
        if data:
            return data
    except Exception:
        pass
    return _auth_get("long_short")


# ── Summary helpers ─────────────────────────────────────────────────────────

def _no_data_msg(name: str) -> str:
    return (f"No {name} data available (free API may be restricted).\n"
            "Set COINGLASS_API_KEY for full access: https://www.coinglass.com/pricing")


def summary_funding(data: list[dict]) -> str:
    if not data:
        return _no_data_msg("funding rate")
    lines = ["═══ Funding Rates ═══", ""]
    for item in data[:20]:
        symbol = item.get("symbol", item.get("coin", "?"))
        rate = None
        if "uMarginList" in item:
            for m in item["uMarginList"]:
                rate = m.get("rate")
                if rate is not None:
                    break
        else:
            rate = item.get("rate")
        if rate is not None:
            lines.append(f"  {symbol:<10} {float(rate)*100:>8.4f}%")
        else:
            lines.append(f"  {symbol:<10} (rate unavailable)")
    return "\n".join(lines)


def summary_oi(data: list[dict]) -> str:
    if not data:
        return _no_data_msg("open interest")
    lines = ["═══ Open Interest ═══", ""]
    for item in data[:20]:
        symbol = item.get("symbol", item.get("coin", "?"))
        oi = item.get("openInterest", item.get("oi", 0))
        lines.append(f"  {symbol:<10} OI: ${float(oi):>15,.0f}")
    return "\n".join(lines)


def summary_ls(data: list[dict]) -> str:
    if not data:
        return _no_data_msg("long/short")
    lines = ["═══ Long/Short Ratios ═══", ""]
    for item in data[:20]:
        symbol = item.get("symbol", item.get("coin", "?"))
        long_rate = item.get("longRate", item.get("longRatio", "?"))
        short_rate = item.get("shortRate", item.get("shortRatio", "?"))
        lines.append(f"  {symbol:<10} Long: {long_rate}  Short: {short_rate}")
    return "\n".join(lines)


# ── CLI ─────────────────────────────────────────────────────────────────────

def main():
    common = argparse.ArgumentParser(add_help=False)
    common.add_argument("--pretty", action="store_true", help="Pretty-print JSON output")
    common.add_argument("--summary", action="store_true", help="Human-readable summary")

    parser = argparse.ArgumentParser(description="Coinglass data connector", parents=[common])
    sub = parser.add_subparsers(dest="command", required=True)

    sub.add_parser("funding", help="Funding rates across exchanges", parents=[common])
    sub.add_parser("oi", help="Open interest overview", parents=[common])
    sub.add_parser("long-short", help="Long/short ratios", parents=[common])

    args = parser.parse_args()

    try:
        if args.command == "funding":
            data = get_funding_rates()
            if args.summary:
                print(summary_funding(data)); return
            result = data
        elif args.command == "oi":
            data = get_open_interest()
            if args.summary:
                print(summary_oi(data)); return
            result = data
        elif args.command == "long-short":
            data = get_long_short_ratio()
            if args.summary:
                print(summary_ls(data)); return
            result = data
        else:
            parser.print_help(); return

        json.dump(result, sys.stdout, indent=2 if args.pretty else None)
        print()

    except EnvironmentError as e:
        print(str(e), file=sys.stderr); sys.exit(1)
    except requests.HTTPError as e:
        print(json.dumps({"error": str(e)}), file=sys.stderr); sys.exit(1)
    except Exception as e:
        print(json.dumps({"error": f"{type(e).__name__}: {e}"}), file=sys.stderr); sys.exit(1)


if __name__ == "__main__":
    main()