"""
Anträge auf Vereinsgründung: Nutzer stellt Antrag, Plattform-Admin legt Verein + Abo an.
"""
from typing import Any, Dict, Optional

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

from account_lifecycle import assert_min_account_state
from capabilities import probe_capability
from club_tenancy import is_platform_admin
from db import get_db, get_cursor, r2d
from tenant_context import TenantContext, get_tenant_context

router = APIRouter(prefix="/api", tags=["club_creation_requests"])

_FREE_PLAN_ID = "free"


def _has_active_membership(cur, profile_id: int) -> bool:
    cur.execute(
        """
        SELECT 1 FROM club_members
        WHERE profile_id = %s AND status = 'active'
        LIMIT 1
        """,
        (profile_id,),
    )
    return cur.fetchone() is not None


def _club_name_taken(cur, name: str, *, exclude_club_id: Optional[int] = None) -> bool:
    n = (name or "").strip()
    if not n:
        return False
    if exclude_club_id is not None:
        cur.execute(
            """
            SELECT 1 FROM clubs
            WHERE lower(trim(name)) = lower(trim(%s)) AND id <> %s
            LIMIT 1
            """,
            (n, exclude_club_id),
        )
    else:
        cur.execute(
            """
            SELECT 1 FROM clubs
            WHERE lower(trim(name)) = lower(trim(%s))
            LIMIT 1
            """,
            (n,),
        )
    return cur.fetchone() is not None


def _provision_club_for_founder(
    cur,
    *,
    founder_profile_id: int,
    name: str,
    abbreviation: Optional[str],
    description: Optional[str],
) -> int:
    """Legt Verein, Mitgliedschaft (club_admin+trainer) und Free-Abo an."""
    cur.execute(
        """
        INSERT INTO clubs (name, abbreviation, description, status, primary_admin_profile_id)
        VALUES (%s, %s, %s, 'active', %s)
        RETURNING id
        """,
        (name, abbreviation, description, founder_profile_id),
    )
    club_id = int(cur.fetchone()["id"])

    cur.execute(
        """
        INSERT INTO club_members (profile_id, club_id, status)
        VALUES (%s, %s, 'active')
        ON CONFLICT (profile_id, club_id)
        DO UPDATE SET status = 'active', updated_at = NOW()
        RETURNING id
        """,
        (founder_profile_id, club_id),
    )
    cm_id = cur.fetchone()["id"]
    for rc in ("club_admin", "trainer"):
        cur.execute(
            """
            INSERT INTO club_member_roles (club_member_id, role_code)
            VALUES (%s, %s)
            ON CONFLICT (club_member_id, role_code) DO NOTHING
            """,
            (cm_id, rc),
        )

    cur.execute(
        """
        INSERT INTO club_subscriptions (club_id, plan_id, status)
        VALUES (%s, %s, 'active')
        ON CONFLICT (club_id) DO NOTHING
        """,
        (club_id, _FREE_PLAN_ID),
    )
    return club_id


class CreationRequestCreate(BaseModel):
    proposed_name: str = Field(..., min_length=2, max_length=200)
    proposed_abbreviation: Optional[str] = Field(None, max_length=50)
    proposed_description: Optional[str] = Field(None, max_length=5000)
    message: Optional[str] = Field(None, max_length=2000)


def _normalize_creation_request_row(row: Dict[str, Any]) -> Dict[str, Any]:
    """Approved ohne Verein → superseded (z. B. nach Vereinslöschung, FK SET NULL)."""
    d = dict(row)
    if d.get("status") == "approved" and not d.get("created_club_id"):
        d["status"] = "superseded"
    return d


def _response_one(cur, req_id: int, viewer_profile_id: int) -> Dict[str, Any]:
    cur.execute(
        """
        SELECT r.*, c.name AS created_club_name
        FROM club_creation_requests r
        LEFT JOIN clubs c ON c.id = r.created_club_id
        WHERE r.id = %s AND r.profile_id = %s
        """,
        (req_id, viewer_profile_id),
    )
    row = cur.fetchone()
    if not row:
        raise HTTPException(status_code=404, detail="Antrag nicht gefunden")
    return _normalize_creation_request_row(r2d(row))


def _assert_platform_admin(tenant: TenantContext) -> None:
    if not is_platform_admin(tenant.global_role):
        raise HTTPException(status_code=403, detail="Nur Plattform-Administratoren")


@router.get("/me/club-creation-requests")
def get_my_creation_requests(tenant: TenantContext = Depends(get_tenant_context)):
    assert_min_account_state(tenant, "verified_pending_club", endpoint="GET /me/club-creation-requests")
    pid = tenant.profile_id
    with get_db() as conn:
        probe_capability(
            tenant,
            "club.creation_request.read_own",
            action="read",
            endpoint="GET /me/club-creation-requests",
            conn=conn,
        )
        cur = get_cursor(conn)
        cur.execute(
            """
            SELECT r.*, c.name AS created_club_name
            FROM club_creation_requests r
            LEFT JOIN clubs c ON c.id = r.created_club_id
            WHERE r.profile_id = %s
            ORDER BY r.created_at DESC
            LIMIT 50
            """,
            (pid,),
        )
        return [_normalize_creation_request_row(r2d(r)) for r in cur.fetchall()]


@router.post("/me/club-creation-requests", status_code=201)
def create_my_creation_request(
    body: CreationRequestCreate,
    tenant: TenantContext = Depends(get_tenant_context),
):
    assert_min_account_state(tenant, "verified_pending_club", endpoint="POST /me/club-creation-requests")
    pid = tenant.profile_id
    name = body.proposed_name.strip()
    abbr = (body.proposed_abbreviation or "").strip() or None
    desc = (body.proposed_description or "").strip() or None
    msg = (body.message or "").strip() or None

    with get_db() as conn:
        probe_capability(
            tenant,
            "club.creation_request.create",
            action="create",
            endpoint="POST /me/club-creation-requests",
            conn=conn,
        )
        cur = get_cursor(conn)

        if _has_active_membership(cur, pid):
            raise HTTPException(
                status_code=400,
                detail="Du bist bereits Vereinsmitglied — Gründungsantrag nicht möglich",
            )

        cur.execute(
            """
            SELECT id FROM club_creation_requests
            WHERE profile_id = %s AND status = 'pending'
            LIMIT 1
            """,
            (pid,),
        )
        if cur.fetchone():
            raise HTTPException(status_code=409, detail="Es liegt bereits ein offener Gründungsantrag vor")

        if _club_name_taken(cur, name):
            raise HTTPException(
                status_code=409,
                detail="Ein Verein mit diesem Namen existiert bereits — bitte anderen Namen wählen",
            )

        cur.execute(
            """
            INSERT INTO club_creation_requests (
                profile_id, proposed_name, proposed_abbreviation,
                proposed_description, message, status
            )
            VALUES (%s, %s, %s, %s, %s, 'pending')
            RETURNING id
            """,
            (pid, name, abbr, desc, msg),
        )
        rid = cur.fetchone()["id"]
        conn.commit()

    with get_db() as conn:
        cur = get_cursor(conn)
        return _response_one(cur, rid, pid)


@router.delete("/me/club-creation-requests/{request_id}")
def withdraw_my_creation_request(request_id: int, tenant: TenantContext = Depends(get_tenant_context)):
    assert_min_account_state(
        tenant, "verified_pending_club", endpoint="DELETE /me/club-creation-requests/{id}"
    )
    pid = tenant.profile_id
    with get_db() as conn:
        probe_capability(
            tenant,
            "club.creation_request.withdraw",
            action="withdraw",
            endpoint="DELETE /me/club-creation-requests/{id}",
            conn=conn,
        )
        cur = get_cursor(conn)
        cur.execute(
            """
            UPDATE club_creation_requests
            SET status = 'withdrawn', updated_at = NOW()
            WHERE id = %s AND profile_id = %s AND status = 'pending'
            RETURNING id
            """,
            (request_id, pid),
        )
        if not cur.fetchone():
            raise HTTPException(status_code=404, detail="Offener Antrag nicht gefunden")
        conn.commit()
    return {"ok": True}


@router.get("/admin/club-creation-requests")
def list_admin_creation_requests(tenant: TenantContext = Depends(get_tenant_context)):
    _assert_platform_admin(tenant)
    with get_db() as conn:
        probe_capability(
            tenant,
            "platform.club_creation.approve",
            action="list",
            endpoint="GET /admin/club-creation-requests",
            conn=conn,
        )
        cur = get_cursor(conn)
        cur.execute(
            """
            SELECT r.*,
                   p.name AS applicant_name,
                   p.email AS applicant_email,
                   c.name AS created_club_name
            FROM club_creation_requests r
            INNER JOIN profiles p ON p.id = r.profile_id
            LEFT JOIN clubs c ON c.id = r.created_club_id
            WHERE r.status = 'pending'
            ORDER BY r.created_at ASC
            """
        )
        return [r2d(row) for row in cur.fetchall()]


@router.post("/admin/club-creation-requests/{request_id}/approve")
def approve_creation_request(request_id: int, tenant: TenantContext = Depends(get_tenant_context)):
    _assert_platform_admin(tenant)
    admin_pid = tenant.profile_id

    with get_db() as conn:
        probe_capability(
            tenant,
            "platform.club_creation.approve",
            action="approve",
            endpoint="POST /admin/club-creation-requests/{id}/approve",
            conn=conn,
        )
        cur = get_cursor(conn)

        cur.execute(
            """
            SELECT id, profile_id, proposed_name, proposed_abbreviation,
                   proposed_description, status
            FROM club_creation_requests
            WHERE id = %s
            """,
            (request_id,),
        )
        row = cur.fetchone()
        if not row:
            raise HTTPException(status_code=404, detail="Antrag nicht gefunden")
        if row["status"] != "pending":
            raise HTTPException(status_code=400, detail="Antrag ist nicht mehr offen")

        applicant_id = int(row["profile_id"])
        name = (row["proposed_name"] or "").strip()
        if not name:
            raise HTTPException(status_code=400, detail="Vorgeschlagener Vereinsname fehlt")

        if _has_active_membership(cur, applicant_id):
            raise HTTPException(
                status_code=409,
                detail="Antragsteller ist bereits Vereinsmitglied — Freigabe nicht möglich",
            )

        if _club_name_taken(cur, name):
            raise HTTPException(
                status_code=409,
                detail="Ein Verein mit diesem Namen existiert bereits",
            )

        club_id = _provision_club_for_founder(
            cur,
            founder_profile_id=applicant_id,
            name=name,
            abbreviation=row.get("proposed_abbreviation"),
            description=row.get("proposed_description"),
        )

        cur.execute(
            """
            UPDATE club_creation_requests
            SET status = 'approved',
                decided_by_profile_id = %s,
                decided_at = NOW(),
                created_club_id = %s,
                updated_at = NOW()
            WHERE id = %s AND status = 'pending'
            RETURNING id
            """,
            (admin_pid, club_id, request_id),
        )
        if not cur.fetchone():
            raise HTTPException(status_code=409, detail="Antrag konnte nicht freigegeben werden")

        conn.commit()

    return {"ok": True, "club_id": club_id, "profile_id": applicant_id}


@router.post("/admin/club-creation-requests/{request_id}/reject")
def reject_creation_request(request_id: int, tenant: TenantContext = Depends(get_tenant_context)):
    _assert_platform_admin(tenant)
    admin_pid = tenant.profile_id

    with get_db() as conn:
        probe_capability(
            tenant,
            "platform.club_creation.approve",
            action="reject",
            endpoint="POST /admin/club-creation-requests/{id}/reject",
            conn=conn,
        )
        cur = get_cursor(conn)
        cur.execute(
            """
            UPDATE club_creation_requests
            SET status = 'rejected',
                decided_by_profile_id = %s,
                decided_at = NOW(),
                updated_at = NOW()
            WHERE id = %s AND status = 'pending'
            RETURNING id
            """,
            (admin_pid, request_id),
        )
        if not cur.fetchone():
            raise HTTPException(status_code=404, detail="Offener Antrag nicht gefunden")
        conn.commit()
    return {"ok": True}