"""
Egendefinerte baner på organisasjonsnivå (ADR-001: gjenbrukbar på tvers av
turneringer, samme mønster som players.py).

`course.source = 'custom'` er den eneste veien inn her -- 'official' (ekte
teeoff-baner via ADR-004 sitt planlagte, lesende API) er fortsatt kun vedtatt,
ikke bygget (se FEATURE_BACKLOG.md), og krever uansett `external_course_ref`
satt (skjemaets CHECK-constraint), som ingen klient kan oppgi meningsfullt
ennå. Denne runden dekker KUN det organisatoren trenger for å opprette en
økt: en bane ved navn, ingen hull-/tee-/rating-detaljer ennå (session-motoren
bruker foreløpig kun course_id som fremmednøkkel, ikke banens innhold).
"""

from fastapi import APIRouter, Depends, Query

from .. import teeoff_client
from ..auth import get_authorized_org
from ..db import org_connection
from ..errors import app_error, translate_db_errors
from pydantic import BaseModel, Field

router = APIRouter()


class CourseCreate(BaseModel):
    name: str = Field(min_length=1, max_length=200)


class Course(BaseModel):
    id: str
    name: str
    source: str


_COURSE_COLUMNS = "id::text, name, source::text AS source"


@router.get("/orgs/{organization_id}/courses", response_model=list[Course])
async def list_courses(
    organization_id: str = Depends(get_authorized_org),
) -> list[Course]:
    async with org_connection(organization_id) as conn:
        rows = await conn.fetch(f"SELECT {_COURSE_COLUMNS} FROM course ORDER BY name")
    return [Course(**dict(r)) for r in rows]


@router.post("/orgs/{organization_id}/courses", response_model=Course, status_code=201)
async def create_course(
    body: CourseCreate,
    organization_id: str = Depends(get_authorized_org),
) -> Course:
    async with org_connection(organization_id) as conn, translate_db_errors():
        row = await conn.fetchrow(
            f"""
            INSERT INTO course (organization_id, name, source)
            VALUES ($1, $2, 'custom')
            RETURNING {_COURSE_COLUMNS}
            """,
            organization_id,
            body.name,
        )
    return Course(**dict(row))


# --- Tee-er (ADR-013-relatert: match_participant.tee_id krever en ekte tee) --
#
# Manglet helt frem til nå -- verken en liste-vei (selv offisielt importerte
# baner har tee-rader, men ingenting eksponerte dem) eller en opprett-vei for
# egendefinerte baner (de har ALDRI hatt noen vei til tee-data, uavhengig av
# ADR-019). Reist av brukeren rett før blind draw-skjermen: uten dette kan en
# match aldri få en deltaker (tee_id er påkrevd, ingen gyldig verdi finnes).
# Kun full_18-rating dekket her, samme begrunnelse som ADR-019 Beslutning D.
# Hull-/stroke-index-data for egendefinerte baner (trengs for korrekt
# slagfordeling i SCORING-fasen, ikke i blind draw) er bevisst UTENFOR
# omfang denne runden -- egen, senere sak når scorekort-skjermen bygges.


class TeeCreate(BaseModel):
    name: str = Field(min_length=1, max_length=50)
    gender: str | None = Field(default=None, pattern="^[mfx]$")
    course_rating: float = Field(gt=0)
    slope_rating: int = Field(ge=55, le=155)
    par: int = Field(ge=27, le=90)


class Tee(BaseModel):
    id: str
    name: str
    gender: str | None
    course_rating: float
    slope_rating: int
    par: int


_TEE_COLUMNS = """
    t.id::text, t.name, t.gender, tr.course_rating::float AS course_rating,
    tr.slope_rating, tr.par
"""


@router.get("/orgs/{organization_id}/courses/{course_id}/tees", response_model=list[Tee])
async def list_tees(
    course_id: str,
    organization_id: str = Depends(get_authorized_org),
) -> list[Tee]:
    async with org_connection(organization_id) as conn:
        rows = await conn.fetch(
            f"""
            SELECT {_TEE_COLUMNS}
            FROM tee t
            JOIN tee_rating tr ON tr.tee_id = t.id AND tr.scope = 'full_18'
            WHERE t.course_id = $1
            ORDER BY t.name
            """,
            course_id,
        )
    return [Tee(**dict(r)) for r in rows]


@router.post("/orgs/{organization_id}/courses/{course_id}/tees", response_model=Tee, status_code=201)
async def create_tee(
    course_id: str,
    body: TeeCreate,
    organization_id: str = Depends(get_authorized_org),
) -> Tee:
    async with org_connection(organization_id) as conn, translate_db_errors():
        source = await conn.fetchval("SELECT source FROM course WHERE id = $1", course_id)
        if source is None:
            raise app_error(404, "NOT_FOUND", "Banen finnes ikke.")
        if source == "official":
            raise app_error(
                400,
                "VALIDATION_FAILED",
                "Offisielle baner får tee-ene sine fra teeoff -- kan ikke legges til manuelt.",
            )

        tee_row = await conn.fetchrow(
            """
            INSERT INTO tee (organization_id, course_id, name, gender)
            VALUES ($1, $2, $3, $4)
            RETURNING id::text
            """,
            organization_id,
            course_id,
            body.name,
            body.gender,
        )
        rating_row = await conn.fetchrow(
            """
            INSERT INTO tee_rating (organization_id, tee_id, scope, course_rating, slope_rating, par)
            VALUES ($1, $2, 'full_18', $3, $4, $5)
            RETURNING course_rating::float AS course_rating, slope_rating, par
            """,
            organization_id,
            tee_row["id"],
            body.course_rating,
            body.slope_rating,
            body.par,
        )
    return Tee(
        id=tee_row["id"],
        name=body.name,
        gender=body.gender,
        course_rating=rating_row["course_rating"],
        slope_rating=rating_row["slope_rating"],
        par=rating_row["par"],
    )


# --- Hull (ADR-008-relatert: stroke_index kreves for slagfordeling i         --
#     scoring-fasen -- se app/routers/scoring.py sin bruk av `hole`-tabellen) -
#
# Egendefinerte baner har ALDRI hatt noen vei til hull-data, uavhengig av
# ADR-019 (samme klasse hull som tee-mangelen -- flagget FØR scorekort-
# skjermen ble bygget, ikke oppdaget for sent). Kun `stroke`-scoringsmodus
# trenger dette; `hole_result`-modus fungerer allerede uten. Engangs
# oppsett: enten alle 18 hull settes i ÉN innsending, eller ingen -- unngår
# kompleksiteten med delvise/partielle hull-sett.


class HoleCreate(BaseModel):
    hole_number: int = Field(ge=1, le=18)
    par: int = Field(ge=3, le=6)
    stroke_index: int = Field(ge=1, le=18)


class Hole(BaseModel):
    hole_number: int
    par: int
    stroke_index: int


@router.get("/orgs/{organization_id}/courses/{course_id}/holes", response_model=list[Hole])
async def list_holes(
    course_id: str,
    organization_id: str = Depends(get_authorized_org),
) -> list[Hole]:
    async with org_connection(organization_id) as conn:
        rows = await conn.fetch(
            "SELECT hole_number, par, stroke_index FROM hole WHERE course_id = $1 ORDER BY hole_number",
            course_id,
        )
    return [Hole(**dict(r)) for r in rows]


@router.post("/orgs/{organization_id}/courses/{course_id}/holes", response_model=list[Hole], status_code=201)
async def create_holes(
    course_id: str,
    body: list[HoleCreate],
    organization_id: str = Depends(get_authorized_org),
) -> list[Hole]:
    if len(body) != 18:
        raise app_error(400, "VALIDATION_FAILED", "Må oppgi nøyaktig 18 hull i én innsending.")
    numbers = sorted(h.hole_number for h in body)
    if numbers != list(range(1, 19)):
        raise app_error(400, "VALIDATION_FAILED", "Hullnumrene må dekke nøyaktig 1-18, hver én gang.")

    async with org_connection(organization_id) as conn, translate_db_errors():
        source = await conn.fetchval("SELECT source FROM course WHERE id = $1", course_id)
        if source is None:
            raise app_error(404, "NOT_FOUND", "Banen finnes ikke.")
        if source == "official":
            raise app_error(
                400,
                "VALIDATION_FAILED",
                "Offisielle baner får hullene sine fra teeoff -- kan ikke legges til manuelt.",
            )
        existing = await conn.fetchval("SELECT count(*) FROM hole WHERE course_id = $1", course_id)
        if existing > 0:
            raise app_error(
                409, "DUPLICATE", "Banen har allerede registrert hull -- kan ikke settes opp på nytt."
            )

        rows = []
        for h in body:
            rows.append(
                await conn.fetchrow(
                    """
                    INSERT INTO hole (organization_id, course_id, hole_number, par, stroke_index)
                    VALUES ($1, $2, $3, $4, $5)
                    RETURNING hole_number, par, stroke_index
                    """,
                    organization_id,
                    course_id,
                    h.hole_number,
                    h.par,
                    h.stroke_index,
                )
            )
    return sorted((Hole(**dict(r)) for r in rows), key=lambda h: h.hole_number)


# --- Offisiell banedata fra teeoff (ADR-019) ---------------------------------


class OfficialFacility(BaseModel):
    slug: str
    name: str
    city: str | None = None
    county: str | None = None


class OfficialCourseOption(BaseModel):
    teeoff_course_id: int
    name: str
    is_main_course: bool


class OfficialFacilityDetail(BaseModel):
    slug: str
    name: str
    courses: list[OfficialCourseOption]


class OfficialCourseImport(BaseModel):
    facility_slug: str
    teeoff_course_id: int


@router.get("/orgs/{organization_id}/courses/official-search", response_model=list[OfficialFacility])
async def search_official_courses(
    q: str = Query(default=""),
    organization_id: str = Depends(get_authorized_org),
) -> list[OfficialFacility]:
    try:
        facilities = await teeoff_client.search_facilities(q)
    except teeoff_client.TeeoffUnavailableError:
        raise app_error(502, "EXTERNAL_SERVICE_UNAVAILABLE", "Klarte ikke å hente baner fra teeoff akkurat nå.")
    return [
        OfficialFacility(slug=f["slug"], name=f["name"], city=f.get("city"), county=f.get("county"))
        for f in facilities
    ]


@router.get(
    "/orgs/{organization_id}/courses/official-search/{slug}",
    response_model=OfficialFacilityDetail,
)
async def get_official_facility(
    slug: str,
    organization_id: str = Depends(get_authorized_org),
) -> OfficialFacilityDetail:
    try:
        facility = await teeoff_client.get_facility(slug)
    except teeoff_client.TeeoffNotFoundError:
        raise app_error(404, "NOT_FOUND", "Anlegget finnes ikke i teeoff.")
    except teeoff_client.TeeoffUnavailableError:
        raise app_error(502, "EXTERNAL_SERVICE_UNAVAILABLE", "Klarte ikke å hente baneinfo fra teeoff akkurat nå.")

    courses = [
        OfficialCourseOption(
            teeoff_course_id=c["id"],
            name=c["name"],
            is_main_course=bool(c.get("is_main_course")),
        )
        # Kun 18-hulls baner kan importeres foreløpig (ADR-019) -- filtrert
        # her slik at organisator aldri ser et valg som senere feiler.
        for c in facility.get("courses", [])
        if len(c.get("holes") or []) == 18
    ]
    return OfficialFacilityDetail(slug=facility["slug"], name=facility["name"], courses=courses)


@router.post("/orgs/{organization_id}/courses/official-import", response_model=Course, status_code=201)
async def import_official_course(
    body: OfficialCourseImport,
    organization_id: str = Depends(get_authorized_org),
) -> Course:
    external_ref = f"{body.facility_slug}:{body.teeoff_course_id}"

    # Idempotent: importerer organisatoren samme bane på nytt (vanlig --
    # flere økter spilles ofte på samme bane), gi tilbake den EKSISTERENDE
    # raden i stedet for en 409-feil. Sjekket FØR noe teeoff-kall gjøres,
    # både raskere og mer robust mot at teeoff er nede akkurat da. Fant
    # og fikset 2026-07-18 etter en reell brukerrapport: duplikat-sperren
    # (migrasjon 010) var riktig i prinsippet, men ga ingen vei videre for
    # den helt vanlige "bruk samme bane på runde 2" siden av saken.
    async with org_connection(organization_id) as conn:
        existing = await conn.fetchrow(
            f"SELECT {_COURSE_COLUMNS} FROM course WHERE external_course_ref = $1",
            external_ref,
        )
        if existing is not None:
            return Course(**dict(existing))

    try:
        facility = await teeoff_client.get_facility(body.facility_slug)
    except teeoff_client.TeeoffNotFoundError:
        raise app_error(404, "NOT_FOUND", "Anlegget finnes ikke i teeoff.")
    except teeoff_client.TeeoffUnavailableError:
        raise app_error(502, "EXTERNAL_SERVICE_UNAVAILABLE", "Klarte ikke å hente baneinfo fra teeoff akkurat nå.")

    course_data = next(
        (c for c in facility.get("courses", []) if c.get("id") == body.teeoff_course_id), None
    )
    if course_data is None:
        raise app_error(404, "NOT_FOUND", "Banen finnes ikke på dette anlegget i teeoff.")

    holes = course_data.get("holes") or []
    tees = course_data.get("tees") or []

    # ADR-019 Beslutning C: hele importen feiler tydelig FØR noe skrives,
    # aldri en delvis importert bane som senere feiler i handicap-beregning.
    if len(holes) != 18:
        raise app_error(
            400, "EXTERNAL_DATA_INCOMPLETE", "Banen har ikke 18 registrerte hull i teeoff ennå."
        )
    for h in holes:
        if h.get("par") is None or h.get("hcp_index") is None:
            raise app_error(
                400,
                "EXTERNAL_DATA_INCOMPLETE",
                "Banen mangler par eller HCP-index på ett eller flere hull i teeoff.",
            )

    # (navn, kjønn, course_rating, slope_rating) -- ADR-019 Beslutning D: kun
    # full_18-rating importeres, teeoff har ingen egen front9/back9-rating.
    tee_inputs: list[tuple[str, str, float, int]] = []
    for t in tees:
        name = t.get("name") or "Tee"
        if t.get("cr_men") is not None and t.get("slope_men") is not None:
            tee_inputs.append((name, "m", float(t["cr_men"]), int(t["slope_men"])))
        if t.get("cr_women") is not None and t.get("slope_women") is not None:
            tee_inputs.append((name, "f", float(t["cr_women"]), int(t["slope_women"])))
    if not tee_inputs:
        raise app_error(
            400,
            "EXTERNAL_DATA_INCOMPLETE",
            "Banen har ingen tee med registrert rating/slope i teeoff ennå.",
        )

    par_total = sum(h["par"] for h in holes)

    # Navn kombinerer anlegg + bane -- "Hovedbanen" alene er tvetydig (mange
    # klubber navngir hovedbanen sin nøyaktig likt). Fant og fikset samme
    # runde som idempotent-fiksen over, samme bakenforliggende brukerrapport.
    course_name = f"{facility.get('name')} – {course_data.get('name') or 'Bane'}"

    async with org_connection(organization_id) as conn, translate_db_errors():
        course_row = await conn.fetchrow(
            f"""
            INSERT INTO course (organization_id, name, source, external_course_ref)
            VALUES ($1, $2, 'official', $3)
            RETURNING {_COURSE_COLUMNS}
            """,
            organization_id,
            course_name,
            external_ref,
        )
        course_id = course_row["id"]

        for h in holes:
            await conn.execute(
                """
                INSERT INTO hole (organization_id, course_id, hole_number, par, stroke_index)
                VALUES ($1, $2, $3, $4, $5)
                """,
                organization_id,
                course_id,
                h["hole_number"],
                h["par"],
                h["hcp_index"],
            )

        for name, gender, course_rating, slope_rating in tee_inputs:
            tee_row = await conn.fetchrow(
                """
                INSERT INTO tee (organization_id, course_id, name, gender)
                VALUES ($1, $2, $3, $4)
                RETURNING id
                """,
                organization_id,
                course_id,
                name,
                gender,
            )
            await conn.execute(
                """
                INSERT INTO tee_rating
                    (organization_id, tee_id, scope, course_rating, slope_rating, par)
                VALUES ($1, $2, 'full_18', $3, $4, $5)
                """,
                organization_id,
                tee_row["id"],
                course_rating,
                slope_rating,
                par_total,
            )

    return Course(**dict(course_row))