"""Fienta ticketing integration - authoritative Discord -> team mapping.

The tournament registration on Fienta collects, per competitor ticket, the
player's Discord username (and sometimes Discord user ID), their team name
(order-level, echoed onto each attendee), and the ticket type (which names the
game). That gives a reliable Discord-identity -> team mapping the nickname-only
registration sheet cannot, so this is the PRIMARY source for team-role sync,
with :mod:`core.sheets` kept as a fallback.

Enabled by ``FIENTA_API_TOKEN`` + ``FIENTA_EVENT_ID``; when either is unset all
caches stay empty and every getter is a no-op, so team sync silently falls back
to the sheet. Only real team members get roles - competitor, coach/manager and
substitute tickets are included; visitors, supporters, LAN-access, early-bird
and waiting-list tickets are excluded.
"""

from __future__ import annotations

import logging

import aiohttp

import config

log = logging.getLogger(__name__)

_API_BASE = "https://fienta.com/api/v1"
_PAGE_SIZE = 1000  # Fienta's max per page; one page covers a whole tournament

# Ticket-type titles that represent an actual team member who should get a role.
_INCLUDED_KEYWORDS = ("competitor", "coach", "manager", "substitute")
# ...unless the title also matches one of these (visitors etc. are never players).
_EXCLUDED_KEYWORDS = (
    "visitor", "supporter", "lan area", "early bird", "waiting list", "waitlist",
)

# Attendee custom-field keys. Fienta appends the field id to the machine name;
# these come from GET /events/{id}/custom-fields for event 176532.
_F_DISCORD_USERNAME = "discord_username_134871"
_F_DISCORD_USERID = "discord_user_id_135840"
_F_TEAM_NAME = "team_name_134821"

_GAME_KEYWORDS: list[tuple[str, tuple[str, ...]]] = [
    ("CS2", ("counter-strike", "counter strike", "cs2", "csgo", "cs:go")),
    ("LoL", ("league of legends", "league", "lol")),
]

# Caches, rebuilt by refresh_teams()/parse_tickets().
_by_username: dict[str, str] = {}   # discord username (lower) -> team name
_by_userid: dict[str, str] = {}     # discord user id (str)    -> team name
_team_game: dict[str, str] = {}     # team name -> "CS2" / "LoL"
_team_names: set[str] = set()


def _norm_username(name: str) -> str:
    """Normalise a Discord username for matching: lowercased, no leading @."""
    return name.strip().lower().lstrip("@")


def _detect_game(ticket_type_title: str) -> str | None:
    """Return the game code for a ticket-type title, or None if unrecognised."""
    title = ticket_type_title.lower()
    for game, keywords in _GAME_KEYWORDS:
        if any(k in title for k in keywords):
            return game
    return None


def _is_included(ticket_type_title: str) -> bool:
    """True when this ticket type is an actual team member (not a visitor etc.)."""
    title = ticket_type_title.lower()
    if any(k in title for k in _EXCLUDED_KEYWORDS):
        return False
    return any(k in title for k in _INCLUDED_KEYWORDS)


def _game_divider_ids() -> dict[str, int]:
    """Map game code -> divider role id, derived from ``config.TEAM_DIVIDERS``.

    Reuses the same ``TEAM_DIVIDER_<SUFFIX>`` role IDs the sheet path uses: a
    suffix like ``cs2_2026`` contributes its id to game ``CS2``.
    """
    out: dict[str, int] = {}
    for suffix, rid in config.TEAM_DIVIDERS.items():
        parts = suffix.split("_")
        if any(p in ("cs2", "cs", "csgo") for p in parts):
            out.setdefault("CS2", rid)
        if any(p in ("lol", "league") for p in parts):
            out.setdefault("LoL", rid)
    return out


def parse_tickets(tickets: list[dict]) -> None:
    """Rebuild the caches from a list of Fienta ticket objects.

    Pure/synchronous so it can be unit-tested without hitting the API.
    """
    global _by_username, _by_userid, _team_game, _team_names
    by_username: dict[str, str] = {}
    by_userid: dict[str, str] = {}
    team_game: dict[str, str] = {}
    for ticket in tickets:
        rows = ticket.get("rows") or []
        if not rows:
            continue
        row = rows[0]
        title = (row.get("ticket_type") or {}).get("title", "")
        if not _is_included(title):
            continue
        attendee = row.get("attendee") or {}
        team = (attendee.get(_F_TEAM_NAME) or "").strip()
        if not team:
            continue
        game = _detect_game(title)
        # Keep the first non-None game seen for a team (all its tickets agree).
        team_game[team] = game or team_game.get(team)
        uname = _norm_username(attendee.get(_F_DISCORD_USERNAME) or "")
        uid = (attendee.get(_F_DISCORD_USERID) or "").strip()
        if uname:
            by_username[uname] = team
        if uid.isdigit():
            by_userid[uid] = team
    _by_username = by_username
    _by_userid = by_userid
    _team_game = team_game
    _team_names = set(team_game)


async def refresh_teams() -> set[str]:
    """Fetch competitor tickets from Fienta and rebuild the caches.

    No-op returning an empty set when ``FIENTA_API_TOKEN`` / ``FIENTA_EVENT_ID``
    are unset, so the caller transparently falls back to the sheet.
    """
    if not config.FIENTA_API_TOKEN or not config.FIENTA_EVENT_ID:
        parse_tickets([])
        return set()

    url = f"{_API_BASE}/events/{config.FIENTA_EVENT_ID}/tickets"
    headers = {"Authorization": f"Bearer {config.FIENTA_API_TOKEN}"}
    tickets: list[dict] = []
    async with aiohttp.ClientSession() as session:
        page = 1
        while True:
            params = {"attendees": "true", "per_page": str(_PAGE_SIZE), "page": str(page)}
            async with session.get(url, headers=headers, params=params) as resp:
                resp.raise_for_status()
                data = await resp.json()
            batch = data.get("tickets") or []
            tickets.extend(batch)
            if len(batch) < _PAGE_SIZE:
                break
            page += 1

    parse_tickets(tickets)
    log.info(
        "Fienta: %d tickets -> %d teams, %d discord usernames, %d discord ids",
        len(tickets), len(_team_names), len(_by_username), len(_by_userid),
    )
    return set(_team_names)


def get_team_for_username(username: str) -> str | None:
    """Team the given Discord username is registered on, or None."""
    return _by_username.get(_norm_username(username))


def get_team_for_userid(user_id: int) -> str | None:
    """Team the given Discord user ID is registered on, or None (IDs are sparse)."""
    return _by_userid.get(str(user_id))


def all_team_names() -> set[str]:
    """Every team name seen in the included Fienta tickets."""
    return set(_team_names)


def get_team_game(team: str) -> str | None:
    """Game code ("CS2"/"LoL") for a team, or None."""
    return _team_game.get(team)


def get_team_dividers() -> dict[str, int]:
    """{team name -> divider role id}, via each team's game and config dividers."""
    game_div = _game_divider_ids()
    return {
        team: game_div[game]
        for team, game in _team_game.items()
        if game and game in game_div
    }