"""
Turneringsoppsett: turneringer, lag, roster, økter.

Autorisasjonsgrense (se plan): kun org-medlemskap (get_authorized_org) kreves
her — dette er organisator-arbeid. Å kreve at brukeren allerede er rostret på
et lag ville vært sirkulært for lag-/roster-opprettelse (ingen kan være
rostret på et lag som ikke finnes ennå).
"""

import json
from datetime import date, datetime

from fastapi import APIRouter, Depends
from pydantic import BaseModel, Field

from ..auth import get_authorized_org
from ..blind_draw import locked_team_ids
from ..db import org_connection
from ..errors import app_error, translate_db_errors

router = APIRouter()


# ---------------------------------------------------------------------------
# Turneringer
# ---------------------------------------------------------------------------

class TournamentCreate(BaseModel):
    name: str = Field(min_length=1, max_length=200)
    start_date: date | None = None
    end_date: date | None = None


class Tournament(BaseModel):
    id: str
    name: str
    status: str
    start_date: date | None
    end_date: date | None


@router.get("/orgs/{organization_id}/tournaments", response_model=list[Tournament])
async def list_tournaments(
    organization_id: str = Depends(get_authorized_org),
) -> list[Tournament]:
    async with org_connection(organization_id) as conn:
        rows = await conn.fetch(
            """
            SELECT id::text, name, status::text, start_date, end_date
            FROM tournament ORDER BY created_at DESC
            """
        )
    return [Tournament(**dict(r)) for r in rows]


@router.post("/orgs/{organization_id}/tournaments", response_model=Tournament, status_code=201)
async def create_tournament(
    body: TournamentCreate,
    organization_id: str = Depends(get_authorized_org),
) -> Tournament:
    async with org_connection(organization_id) as conn, translate_db_errors():
        row = await conn.fetchrow(
            """
            INSERT INTO tournament (organization_id, name, start_date, end_date)
            VALUES ($1, $2, $3, $4)
            RETURNING id::text, name, status::text, start_date, end_date
            """,
            organization_id,
            body.name,
            body.start_date,
            body.end_date,
        )
    return Tournament(**dict(row))


# ---------------------------------------------------------------------------
# Lag (ADR-011: maks to lag per turnering, håndhevet her — ikke i skjemaet —
# slik at match-modellen kan holdes generell for fremtidige turneringstyper)
# ---------------------------------------------------------------------------

class TeamCreate(BaseModel):
    name: str = Field(min_length=1, max_length=200)
    color: str | None = None


class Team(BaseModel):
    id: str
    name: str
    color: str | None


@router.get("/orgs/{organization_id}/tournaments/{tournament_id}/teams", response_model=list[Team])
async def list_teams(
    tournament_id: str,
    organization_id: str = Depends(get_authorized_org),
) -> list[Team]:
    async with org_connection(organization_id) as conn:
        rows = await conn.fetch(
            "SELECT id::text, name, color FROM team WHERE tournament_id = $1 ORDER BY created_at",
            tournament_id,
        )
    return [Team(**dict(r)) for r in rows]


@router.post(
    "/orgs/{organization_id}/tournaments/{tournament_id}/teams",
    response_model=Team,
    status_code=201,
)
async def create_team(
    tournament_id: str,
    body: TeamCreate,
    organization_id: str = Depends(get_authorized_org),
) -> Team:
    async with org_connection(organization_id) as conn, translate_db_errors():
        # Lås turneringsraden slik at to samtidige forespørsler ikke begge kan
        # lese "1 lag" og begge sette inn et andre/tredje lag (TOCTOU).
        locked = await conn.fetchrow(
            "SELECT id FROM tournament WHERE id = $1 AND organization_id = $2 FOR UPDATE",
            tournament_id,
            organization_id,
        )
        if locked is None:
            raise app_error(404, "NOT_FOUND", "Turneringen finnes ikke.")

        existing = await conn.fetchval(
            "SELECT count(*) FROM team WHERE tournament_id = $1", tournament_id
        )
        if existing >= 2:
            raise app_error(
                409, "LIMIT_REACHED", "Turneringen har allerede to lag (ADR-011: nøyaktig to lag)."
            )

        row = await conn.fetchrow(
            """
            INSERT INTO team (organization_id, tournament_id, name, color)
            VALUES ($1, $2, $3, $4)
            RETURNING id::text, name, color
            """,
            organization_id,
            tournament_id,
            body.name,
            body.color,
        )
    return Team(**dict(row))


# ---------------------------------------------------------------------------
# Roster (spiller-pool per lag, ADR-007)
# ---------------------------------------------------------------------------

class RosterEntryCreate(BaseModel):
    player_id: str
    is_captain: bool = False
    # None => fryses fra player.handicap_index ved innsetting (ADR-007).
    handicap_index_snapshot: float | None = None


class RosterEntry(BaseModel):
    id: str
    player_id: str
    display_name: str
    handicap_index_snapshot: float | None
    is_captain: bool


@router.get("/orgs/{organization_id}/teams/{team_id}/roster", response_model=list[RosterEntry])
async def list_roster(
    team_id: str,
    organization_id: str = Depends(get_authorized_org),
) -> list[RosterEntry]:
    async with org_connection(organization_id) as conn:
        rows = await conn.fetch(
            """
            SELECT tr.id::text, tr.player_id::text,
                   tr.handicap_index_snapshot::float AS handicap_index_snapshot,
                   tr.is_captain, p.display_name
            FROM team_roster tr
            JOIN player p ON p.id = tr.player_id
            WHERE tr.team_id = $1
            ORDER BY p.display_name
            """,
            team_id,
        )
    return [RosterEntry(**dict(r)) for r in rows]


@router.post(
    "/orgs/{organization_id}/teams/{team_id}/roster",
    response_model=RosterEntry,
    status_code=201,
)
async def add_roster_entry(
    team_id: str,
    body: RosterEntryCreate,
    organization_id: str = Depends(get_authorized_org),
) -> RosterEntry:
    async with org_connection(organization_id) as conn, translate_db_errors():
        team = await conn.fetchrow("SELECT tournament_id FROM team WHERE id = $1", team_id)
        if team is None:
            raise app_error(404, "NOT_FOUND", "Laget finnes ikke.")

        # Skjemaet håndhever kun unikhet PER lag (UNIQUE(team_id, player_id)).
        # Uten denne sjekken kunne en spiller rostres på BEGGE lag i samme
        # turnering, og own_team_ids() (blind draw-filteret i matches.py) ville
        # da regnet hen som "eget lag" på begge sider — hen ville sett
        # motstanderens skjulte oppstilling før lås (ADR-013).
        already_elsewhere = await conn.fetchval(
            """
            SELECT EXISTS (
                SELECT 1 FROM team_roster tr
                JOIN team t ON t.id = tr.team_id
                WHERE t.tournament_id = $1 AND tr.player_id = $2 AND tr.team_id <> $3
            )
            """,
            team["tournament_id"],
            body.player_id,
            team_id,
        )
        if already_elsewhere:
            raise app_error(
                409,
                "DUPLICATE",
                "Spilleren er allerede rostret på det andre laget i denne turneringen.",
            )

        snapshot = body.handicap_index_snapshot
        if snapshot is None:
            snapshot = await conn.fetchval(
                "SELECT handicap_index FROM player WHERE id = $1", body.player_id
            )

        row = await conn.fetchrow(
            """
            WITH inserted AS (
                INSERT INTO team_roster
                    (organization_id, team_id, player_id, handicap_index_snapshot, is_captain)
                VALUES ($1, $2, $3, $4, $5)
                RETURNING id, player_id, handicap_index_snapshot, is_captain
            )
            SELECT inserted.id::text, inserted.player_id::text,
                   inserted.handicap_index_snapshot::float AS handicap_index_snapshot,
                   inserted.is_captain, p.display_name
            FROM inserted JOIN player p ON p.id = inserted.player_id
            """,
            organization_id,
            team_id,
            body.player_id,
            snapshot,
            body.is_captain,
        )
    return RosterEntry(**dict(row))


# ---------------------------------------------------------------------------
# Økter (ADR-007: turnering = ordnet sekvens av økter)
# ---------------------------------------------------------------------------

class SessionCreate(BaseModel):
    sequence: int
    name: str | None = None
    format: str
    hole_config: str = "full_18"
    course_id: str
    points_per_match: float = 1.0
    allowance_override: dict | None = None
    # ADR-012: 'stroke' (hole_score, motoren utleder netto) eller 'hole_result'
    # (match_hole_result, bare hvem som vant hullet). DB-default er 'stroke'.
    scoring_mode: str = "stroke"
    # Klokkeslett-modell (se plan): én starttid + ett intervall per økt.
    # match.tee_time utledes av disse i matches.py, IKKE lagret per match.
    scheduled_at: datetime | None = None
    tee_interval_minutes: int | None = None
    start_hole: int = 1


class SessionOut(BaseModel):
    id: str
    sequence: int
    name: str | None
    format: str
    hole_config: str
    course_id: str
    points_per_match: float
    allowance_override: dict | None
    scoring_mode: str
    scheduled_at: datetime | None
    tee_interval_minutes: int | None
    start_hole: int
    locked_team_ids: list[str]
    revealed: bool


def _session_out(row, locked: set[str]) -> SessionOut:
    return SessionOut(
        id=row["id"],
        sequence=row["sequence"],
        name=row["name"],
        format=row["format"],
        hole_config=row["hole_config"],
        course_id=row["course_id"],
        points_per_match=row["points_per_match"],
        allowance_override=json.loads(row["allowance_override"]) if row["allowance_override"] else None,
        scoring_mode=row["scoring_mode"],
        scheduled_at=row["scheduled_at"],
        tee_interval_minutes=row["tee_interval_minutes"],
        start_hole=row["start_hole"],
        locked_team_ids=sorted(locked),
        revealed=len(locked) >= 2,
    )


@router.get(
    "/orgs/{organization_id}/tournaments/{tournament_id}/sessions",
    response_model=list[SessionOut],
)
async def list_sessions(
    tournament_id: str,
    organization_id: str = Depends(get_authorized_org),
) -> list[SessionOut]:
    async with org_connection(organization_id) as conn:
        rows = await conn.fetch(
            """
            SELECT id::text, sequence, name, format, hole_config::text AS hole_config,
                   course_id::text, points_per_match::float AS points_per_match,
                   allowance_override::text AS allowance_override, scoring_mode,
                   scheduled_at, tee_interval_minutes, start_hole
            FROM session
            WHERE tournament_id = $1
            ORDER BY sequence
            """,
            tournament_id,
        )
        result = []
        for r in rows:
            locked = await locked_team_ids(conn, r["id"])
            result.append(_session_out(r, locked))
    return result


@router.post(
    "/orgs/{organization_id}/tournaments/{tournament_id}/sessions",
    response_model=SessionOut,
    status_code=201,
)
async def create_session(
    tournament_id: str,
    body: SessionCreate,
    organization_id: str = Depends(get_authorized_org),
) -> SessionOut:
    allowance_json = json.dumps(body.allowance_override) if body.allowance_override is not None else None
    async with org_connection(organization_id) as conn, translate_db_errors():
        row = await conn.fetchrow(
            """
            INSERT INTO session
                (organization_id, tournament_id, sequence, name, format,
                 hole_config, course_id, points_per_match, allowance_override, scoring_mode,
                 scheduled_at, tee_interval_minutes, start_hole)
            VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9::jsonb, $10, $11, $12, $13)
            RETURNING id::text, sequence, name, format, hole_config::text AS hole_config,
                      course_id::text, points_per_match::float AS points_per_match,
                      allowance_override::text AS allowance_override, scoring_mode,
                      scheduled_at, tee_interval_minutes, start_hole
            """,
            organization_id,
            tournament_id,
            body.sequence,
            body.name,
            body.format,
            body.hole_config,
            body.course_id,
            body.points_per_match,
            allowance_json,
            body.scoring_mode,
            body.scheduled_at,
            body.tee_interval_minutes,
            body.start_hole,
        )
    return _session_out(row, set())