"""Async PocketBase REST client for TipiLAN Bot.

Handles admin authentication (auto-refreshed), and CRUD operations on the
economy_users collection.  Uses aiohttp, which discord.py already depends on.

Environment variables (set in .env):
    PB_URL              Base URL of PocketBase  (default: http://127.0.0.1:8090)
    PB_ADMIN_EMAIL      PocketBase admin e-mail
    PB_ADMIN_PASSWORD   PocketBase admin password
"""

from __future__ import annotations

import asyncio
import logging
import os
import time
from typing import Any

import aiohttp

_log = logging.getLogger("tipiCOIN.pb")

PB_URL = os.getenv("PB_URL", "http://127.0.0.1:8090")
PB_ADMIN_EMAIL = os.getenv("PB_ADMIN_EMAIL", "")
PB_ADMIN_PASSWORD = os.getenv("PB_ADMIN_PASSWORD", "")
ECONOMY_COLLECTION = "economy_users"

_TIMEOUT = aiohttp.ClientTimeout(total=10)

# ---------------------------------------------------------------------------
# Persistent session (created once, reused for the lifetime of the process)
# ---------------------------------------------------------------------------
_session: aiohttp.ClientSession | None = None


def _get_session() -> aiohttp.ClientSession:
    global _session
    if _session is None or _session.closed:
        _session = aiohttp.ClientSession(timeout=_TIMEOUT)
    return _session


# ---------------------------------------------------------------------------
# Auth token cache
# ---------------------------------------------------------------------------
_token: str = ""
_token_expiry: float = 0.0
_auth_lock = asyncio.Lock()


async def _ensure_auth() -> str:
    global _token, _token_expiry
    async with _auth_lock:
        if time.monotonic() < _token_expiry:
            return _token
        session = _get_session()
        async with session.post(
            f"{PB_URL}/api/collections/_superusers/auth-with-password",
            json={"identity": PB_ADMIN_EMAIL, "password": PB_ADMIN_PASSWORD},
        ) as resp:
            if resp.status != 200:
                text = await resp.text()
                raise RuntimeError(f"PocketBase auth failed ({resp.status}): {text}")
            data = await resp.json()
            _token = data["token"]
            _token_expiry = time.monotonic() + 13 * 24 * 3600  # refresh well before expiry
            _log.debug("PocketBase admin token refreshed")
    return _token


async def _hdrs() -> dict[str, str]:
    return {"Authorization": await _ensure_auth()}


# ---------------------------------------------------------------------------
# CRUD helpers
# ---------------------------------------------------------------------------

async def get_record(user_id: str) -> dict[str, Any] | None:
    """Fetch one economy record by Discord user_id. Returns None if not found."""
    session = _get_session()
    async with session.get(
        f"{PB_URL}/api/collections/{ECONOMY_COLLECTION}/records",
        params={"filter": f'user_id="{user_id}"', "perPage": 1},
        headers=await _hdrs(),
    ) as resp:
        resp.raise_for_status()
        data = await resp.json()
        items = data.get("items", [])
        return items[0] if items else None


async def create_record(record: dict[str, Any]) -> dict[str, Any]:
    """Create a new economy record. Returns the created record (includes PB id)."""
    session = _get_session()
    async with session.post(
        f"{PB_URL}/api/collections/{ECONOMY_COLLECTION}/records",
        json=record,
        headers=await _hdrs(),
    ) as resp:
        if resp.status not in (200, 201):
            text = await resp.text()
            raise RuntimeError(f"PocketBase create failed ({resp.status}): {text}")
        return await resp.json()


async def update_record(record_id: str, data: dict[str, Any]) -> dict[str, Any]:
    """PATCH an existing record by its PocketBase record id."""
    session = _get_session()
    async with session.patch(
        f"{PB_URL}/api/collections/{ECONOMY_COLLECTION}/records/{record_id}",
        json=data,
        headers=await _hdrs(),
    ) as resp:
        resp.raise_for_status()
        return await resp.json()


async def count_records() -> int:
    """Return the total number of records in the collection (single cheap request)."""
    session = _get_session()
    async with session.get(
        f"{PB_URL}/api/collections/{ECONOMY_COLLECTION}/records",
        params={"perPage": 1, "page": 1},
        headers=await _hdrs(),
    ) as resp:
        resp.raise_for_status()
        data = await resp.json()
        return int(data.get("totalItems", 0))


async def list_all_records(page_size: int = 500) -> list[dict[str, Any]]:
    """Fetch every record in the collection, handling PocketBase pagination."""
    results: list[dict[str, Any]] = []
    page = 1
    session = _get_session()
    hdrs = await _hdrs()
    while True:
        async with session.get(
            f"{PB_URL}/api/collections/{ECONOMY_COLLECTION}/records",
            params={"perPage": page_size, "page": page},
            headers=hdrs,
        ) as resp:
            resp.raise_for_status()
            data = await resp.json()
            batch = data.get("items", [])
            results.extend(batch)
            if len(batch) < page_size:
                break
            page += 1
    return results