"""
Club & Organization Management Endpoints for Shinkan Jinkendo

Handles CRUD operations for clubs, divisions, and training groups.
"""
from typing import Optional
from fastapi import APIRouter, HTTPException, Depends, Query

from db import get_db, get_cursor, r2d
from auth import require_auth

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


# ── List Clubs ────────────────────────────────────────────────────────
@router.get("/clubs")
def list_clubs(
    status: Optional[str] = Query(default=None),
    session=Depends(require_auth)
):
    """
    List all clubs (public for authenticated users).

    Filters:
    - status: active, inactive
    """
    with get_db() as conn:
        cur = get_cursor(conn)

        query = "SELECT * FROM clubs"
        params = []

        if status:
            query += " WHERE status = %s"
            params.append(status)

        query += " ORDER BY name"

        cur.execute(query, params)
        rows = cur.fetchall()
        return [r2d(r) for r in rows]


# ── Get Club ──────────────────────────────────────────────────────────
@router.get("/clubs/{club_id}")
def get_club(club_id: int, session=Depends(require_auth)):
    """Get club by ID with divisions and groups."""
    with get_db() as conn:
        cur = get_cursor(conn)

        # Get club
        cur.execute("SELECT * FROM clubs WHERE id = %s", (club_id,))
        club = cur.fetchone()

        if not club:
            raise HTTPException(404, "Verein nicht gefunden")

        club = r2d(club)

        # Get divisions
        cur.execute("""
            SELECT * FROM divisions
            WHERE club_id = %s
            ORDER BY name
        """, (club_id,))
        club['divisions'] = [r2d(r) for r in cur.fetchall()]

        # Get training groups
        cur.execute("""
            SELECT g.*,
                p.name as trainer_name
            FROM training_groups g
            LEFT JOIN profiles p ON g.trainer_id = p.id
            WHERE g.club_id = %s
            ORDER BY g.weekday, g.time_start
        """, (club_id,))
        club['training_groups'] = [r2d(r) for r in cur.fetchall()]

        return club


# ── Create Club ───────────────────────────────────────────────────────
@router.post("/clubs")
def create_club(data: dict, session=Depends(require_auth)):
    """Create new club (admin only)."""
    role = session.get('role')
    if role not in ['admin', 'superadmin']:
        raise HTTPException(403, "Nur Admins dürfen Vereine erstellen")

    name = data.get('name')
    if not name:
        raise HTTPException(400, "Name ist Pflichtfeld")

    with get_db() as conn:
        cur = get_cursor(conn)

        cur.execute("""
            INSERT INTO clubs (name, abbreviation, description, status)
            VALUES (%s, %s, %s, %s)
            RETURNING id
        """, (
            name,
            data.get('abbreviation'),
            data.get('description'),
            data.get('status', 'active')
        ))

        club_id = cur.fetchone()['id']
        conn.commit()

    return get_club(club_id, session)


# ── Update Club ───────────────────────────────────────────────────────
@router.put("/clubs/{club_id}")
def update_club(club_id: int, data: dict, session=Depends(require_auth)):
    """Update club (admin only)."""
    role = session.get('role')
    if role not in ['admin', 'superadmin']:
        raise HTTPException(403, "Nur Admins dürfen Vereine bearbeiten")

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check existence
        cur.execute("SELECT id FROM clubs WHERE id = %s", (club_id,))
        if not cur.fetchone():
            raise HTTPException(404, "Verein nicht gefunden")

        # Update
        cur.execute("""
            UPDATE clubs SET
                name = %s,
                abbreviation = %s,
                description = %s,
                status = %s,
                updated_at = NOW()
            WHERE id = %s
        """, (
            data.get('name'),
            data.get('abbreviation'),
            data.get('description'),
            data.get('status'),
            club_id
        ))

        conn.commit()

    return get_club(club_id, session)


# ── Delete Club ───────────────────────────────────────────────────────
@router.delete("/clubs/{club_id}")
def delete_club(club_id: int, session=Depends(require_auth)):
    """Delete club (superadmin only)."""
    role = session.get('role')
    if role != 'superadmin':
        raise HTTPException(403, "Nur Superadmins dürfen Vereine löschen")

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check existence
        cur.execute("SELECT id FROM clubs WHERE id = %s", (club_id,))
        if not cur.fetchone():
            raise HTTPException(404, "Verein nicht gefunden")

        # Delete (CASCADE handles divisions and groups)
        cur.execute("DELETE FROM clubs WHERE id = %s", (club_id,))
        conn.commit()

    return {"ok": True}


# ── List Divisions ────────────────────────────────────────────────────
@router.get("/divisions")
def list_divisions(
    club_id: Optional[int] = Query(default=None),
    session=Depends(require_auth)
):
    """List divisions (optional filter by club)."""
    with get_db() as conn:
        cur = get_cursor(conn)

        query = """
            SELECT d.*, c.name as club_name
            FROM divisions d
            LEFT JOIN clubs c ON d.club_id = c.id
        """
        params = []

        if club_id:
            query += " WHERE d.club_id = %s"
            params.append(club_id)

        query += " ORDER BY d.name"

        cur.execute(query, params)
        rows = cur.fetchall()
        return [r2d(r) for r in rows]


# ── Create Division ───────────────────────────────────────────────────
@router.post("/divisions")
def create_division(data: dict, session=Depends(require_auth)):
    """Create new division (admin only)."""
    role = session.get('role')
    if role not in ['admin', 'superadmin']:
        raise HTTPException(403, "Nur Admins dürfen Sparten erstellen")

    club_id = data.get('club_id')
    name = data.get('name')

    if not club_id or not name:
        raise HTTPException(400, "club_id und name sind Pflichtfelder")

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check club exists
        cur.execute("SELECT id FROM clubs WHERE id = %s", (club_id,))
        if not cur.fetchone():
            raise HTTPException(404, "Verein nicht gefunden")

        # Insert
        cur.execute("""
            INSERT INTO divisions (club_id, name, focus_area)
            VALUES (%s, %s, %s)
            RETURNING id
        """, (
            club_id,
            name,
            data.get('focus_area')
        ))

        division_id = cur.fetchone()['id']
        conn.commit()

        # Return created division
        cur.execute("""
            SELECT d.*, c.name as club_name
            FROM divisions d
            LEFT JOIN clubs c ON d.club_id = c.id
            WHERE d.id = %s
        """, (division_id,))
        return r2d(cur.fetchone())


# ── Update Division ───────────────────────────────────────────────────
@router.put("/divisions/{division_id}")
def update_division(division_id: int, data: dict, session=Depends(require_auth)):
    """Update division (admin only)."""
    role = session.get('role')
    if role not in ['admin', 'superadmin']:
        raise HTTPException(403, "Nur Admins dürfen Sparten bearbeiten")

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check existence
        cur.execute("SELECT id FROM divisions WHERE id = %s", (division_id,))
        if not cur.fetchone():
            raise HTTPException(404, "Sparte nicht gefunden")

        # Update
        cur.execute("""
            UPDATE divisions SET
                name = %s,
                focus_area = %s,
                updated_at = NOW()
            WHERE id = %s
        """, (
            data.get('name'),
            data.get('focus_area'),
            division_id
        ))

        conn.commit()

        # Return updated division
        cur.execute("""
            SELECT d.*, c.name as club_name
            FROM divisions d
            LEFT JOIN clubs c ON d.club_id = c.id
            WHERE d.id = %s
        """, (division_id,))
        return r2d(cur.fetchone())


# ── Delete Division ───────────────────────────────────────────────────
@router.delete("/divisions/{division_id}")
def delete_division(division_id: int, session=Depends(require_auth)):
    """Delete division (admin only)."""
    role = session.get('role')
    if role not in ['admin', 'superadmin']:
        raise HTTPException(403, "Nur Admins dürfen Sparten löschen")

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check existence
        cur.execute("SELECT id FROM divisions WHERE id = %s", (division_id,))
        if not cur.fetchone():
            raise HTTPException(404, "Sparte nicht gefunden")

        # Delete
        cur.execute("DELETE FROM divisions WHERE id = %s", (division_id,))
        conn.commit()

    return {"ok": True}


# ── List Training Groups ──────────────────────────────────────────────
@router.get("/groups")
def list_training_groups(
    club_id: Optional[int] = Query(default=None),
    division_id: Optional[int] = Query(default=None),
    status: Optional[str] = Query(default=None),
    session=Depends(require_auth)
):
    """
    List training groups with optional filters.

    Filters:
    - club_id: Filter by club
    - division_id: Filter by division
    - status: active, inactive
    """
    with get_db() as conn:
        cur = get_cursor(conn)

        query = """
            SELECT g.*,
                c.name as club_name,
                d.name as division_name,
                p.name as trainer_name
            FROM training_groups g
            LEFT JOIN clubs c ON g.club_id = c.id
            LEFT JOIN divisions d ON g.division_id = d.id
            LEFT JOIN profiles p ON g.trainer_id = p.id
        """

        where = []
        params = []

        if club_id:
            where.append("g.club_id = %s")
            params.append(club_id)

        if division_id:
            where.append("g.division_id = %s")
            params.append(division_id)

        if status:
            where.append("g.status = %s")
            params.append(status)

        if where:
            query += " WHERE " + " AND ".join(where)

        query += " ORDER BY g.weekday, g.time_start"

        cur.execute(query, params)
        rows = cur.fetchall()
        return [r2d(r) for r in rows]


# ── Get Training Group ────────────────────────────────────────────────
@router.get("/groups/{group_id}")
def get_training_group(group_id: int, session=Depends(require_auth)):
    """Get training group by ID."""
    with get_db() as conn:
        cur = get_cursor(conn)

        cur.execute("""
            SELECT g.*,
                c.name as club_name,
                d.name as division_name,
                p.name as trainer_name
            FROM training_groups g
            LEFT JOIN clubs c ON g.club_id = c.id
            LEFT JOIN divisions d ON g.division_id = d.id
            LEFT JOIN profiles p ON g.trainer_id = p.id
            WHERE g.id = %s
        """, (group_id,))

        group = cur.fetchone()

        if not group:
            raise HTTPException(404, "Trainingsgruppe nicht gefunden")

        return r2d(group)


# ── Create Training Group ─────────────────────────────────────────────
@router.post("/groups")
def create_training_group(data: dict, session=Depends(require_auth)):
    """Create new training group (admin or trainer)."""
    role = session.get('role')
    if role not in ['admin', 'superadmin', 'trainer']:
        raise HTTPException(403, "Nur Admins und Trainer dürfen Gruppen erstellen")

    club_id = data.get('club_id')
    name = data.get('name')

    if not club_id or not name:
        raise HTTPException(400, "club_id und name sind Pflichtfelder")

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check club exists
        cur.execute("SELECT id FROM clubs WHERE id = %s", (club_id,))
        if not cur.fetchone():
            raise HTTPException(404, "Verein nicht gefunden")

        # Insert
        cur.execute("""
            INSERT INTO training_groups (
                club_id, division_id, name, focus, level, age_group,
                weekday, time_start, time_end, location,
                trainer_id, co_trainer_ids, status
            ) VALUES (
                %s, %s, %s, %s, %s, %s,
                %s, %s, %s, %s,
                %s, %s, %s
            ) RETURNING id
        """, (
            club_id,
            data.get('division_id'),
            name,
            data.get('focus'),
            data.get('level'),
            data.get('age_group'),
            data.get('weekday'),
            data.get('time_start'),
            data.get('time_end'),
            data.get('location'),
            data.get('trainer_id'),
            data.get('co_trainer_ids'),
            data.get('status', 'active')
        ))

        group_id = cur.fetchone()['id']
        conn.commit()

    return get_training_group(group_id, session)


# ── Update Training Group ─────────────────────────────────────────────
@router.put("/groups/{group_id}")
def update_training_group(group_id: int, data: dict, session=Depends(require_auth)):
    """Update training group (admin or assigned trainer)."""
    profile_id = session['profile_id']
    role = session.get('role')

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check existence and ownership
        cur.execute("SELECT trainer_id FROM training_groups WHERE id = %s", (group_id,))
        row = cur.fetchone()
        if not row:
            raise HTTPException(404, "Trainingsgruppe nicht gefunden")

        # Only admin or assigned trainer can update
        if role not in ['admin', 'superadmin'] and row['trainer_id'] != profile_id:
            raise HTTPException(403, "Keine Berechtigung")

        # Update
        cur.execute("""
            UPDATE training_groups SET
                name = %s,
                division_id = %s,
                focus = %s,
                level = %s,
                age_group = %s,
                weekday = %s,
                time_start = %s,
                time_end = %s,
                location = %s,
                trainer_id = %s,
                co_trainer_ids = %s,
                status = %s,
                updated_at = NOW()
            WHERE id = %s
        """, (
            data.get('name'),
            data.get('division_id'),
            data.get('focus'),
            data.get('level'),
            data.get('age_group'),
            data.get('weekday'),
            data.get('time_start'),
            data.get('time_end'),
            data.get('location'),
            data.get('trainer_id'),
            data.get('co_trainer_ids'),
            data.get('status'),
            group_id
        ))

        conn.commit()

    return get_training_group(group_id, session)


# ── Delete Training Group ─────────────────────────────────────────────
@router.delete("/groups/{group_id}")
def delete_training_group(group_id: int, session=Depends(require_auth)):
    """Delete training group (admin only)."""
    role = session.get('role')
    if role not in ['admin', 'superadmin']:
        raise HTTPException(403, "Nur Admins dürfen Gruppen löschen")

    with get_db() as conn:
        cur = get_cursor(conn)

        # Check existence
        cur.execute("SELECT id FROM training_groups WHERE id = %s", (group_id,))
        if not cur.fetchone():
            raise HTTPException(404, "Trainingsgruppe nicht gefunden")

        # Delete
        cur.execute("DELETE FROM training_groups WHERE id = %s", (group_id,))
        conn.commit()

    return {"ok": True}