"""BAN YARO — Hundesitting"""

import json
import math
from fastapi import APIRouter, Depends, HTTPException
from pydantic import BaseModel
from typing import Optional, List
from database import db
from auth import get_current_user

router = APIRouter()

SERVICES = {'tagesbetreuung', 'uebernachtung', 'gassi', 'hausbesuch'}


def _haversine(lat1, lon1, lat2, lon2):
    R  = 6_371_000
    p1, p2 = math.radians(lat1), math.radians(lat2)
    dp = math.radians(lat2 - lat1)
    dl = math.radians(lon2 - lon1)
    a  = math.sin(dp / 2) ** 2 + math.cos(p1) * math.cos(p2) * math.sin(dl / 2) ** 2
    return 2 * R * math.asin(math.sqrt(a))


# ------------------------------------------------------------------
# Schemas
# ------------------------------------------------------------------
class SitterCreate(BaseModel):
    beschreibung:  Optional[str]        = None
    preis_pro_tag: float                = 0
    max_hunde:     int                  = 1
    lat:           Optional[float]      = None
    lon:           Optional[float]      = None
    radius_km:     int                  = 20
    services:      List[str]            = []

class SitterUpdate(BaseModel):
    beschreibung:  Optional[str]   = None
    preis_pro_tag: Optional[float] = None
    max_hunde:     Optional[int]   = None
    lat:           Optional[float] = None
    lon:           Optional[float] = None
    radius_km:     Optional[int]   = None
    services:      Optional[List[str]] = None
    aktiv:         Optional[int]   = None

class RequestCreate(BaseModel):
    sitter_id:  int
    dog_ids:    List[int] = []
    von:        str        # YYYY-MM-DD
    bis:        str
    nachricht:  Optional[str] = None

class RequestUpdate(BaseModel):
    status: str  # angenommen | abgelehnt | abgebrochen


# ------------------------------------------------------------------
# GET /api/sitting — Sitter-Liste
# ------------------------------------------------------------------
@router.get("")
async def list_sitters(
    lat:    Optional[float] = None,
    lon:    Optional[float] = None,
    radius: int             = 30000,
    service: Optional[str] = None,
):
    with db() as conn:
        rows = conn.execute("""
            SELECT s.*, u.name AS sitter_name
            FROM sitters s
            JOIN users u ON u.id = s.user_id
            WHERE s.aktiv = 1
        """).fetchall()

    result = []
    for r in rows:
        d = dict(r)
        d['services'] = json.loads(d['services'] or '[]')
        if service and service not in d['services']:
            continue
        if lat is not None and lon is not None and d['lat'] and d['lon']:
            dist = _haversine(lat, lon, d['lat'], d['lon'])
            if dist > radius:
                continue
            d['distanz_m'] = round(dist)
        result.append(d)

    if lat is not None:
        result.sort(key=lambda x: x.get('distanz_m', 999999))
    return result


# ------------------------------------------------------------------
# GET /api/sitting/me — eigenes Sitter-Profil
# ------------------------------------------------------------------
@router.get("/me")
async def get_my_sitter_profile(user=Depends(get_current_user)):
    with db() as conn:
        row = conn.execute(
            "SELECT * FROM sitters WHERE user_id = ?", (user['id'],)
        ).fetchone()
    if not row:
        return None
    d = dict(row)
    d['services'] = json.loads(d['services'] or '[]')
    return d


# ------------------------------------------------------------------
# POST /api/sitting — Sitter-Profil erstellen oder aktualisieren
# ------------------------------------------------------------------
@router.post("", status_code=201)
async def create_sitter(data: SitterCreate, user=Depends(get_current_user)):
    services_json = json.dumps([s for s in data.services if s in SERVICES])
    with db() as conn:
        existing = conn.execute(
            "SELECT id FROM sitters WHERE user_id = ?", (user['id'],)
        ).fetchone()
        if existing:
            raise HTTPException(409, "Du hast bereits ein Sitter-Profil. Nutze PATCH zum Aktualisieren.")
        cur = conn.execute("""
            INSERT INTO sitters (user_id, beschreibung, preis_pro_tag, max_hunde, lat, lon, radius_km, services)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?)
        """, (user['id'], data.beschreibung, data.preis_pro_tag,
              data.max_hunde, data.lat, data.lon, data.radius_km, services_json))
        row = conn.execute("SELECT * FROM sitters WHERE id = ?", (cur.lastrowid,)).fetchone()
    d = dict(row)
    d['services'] = json.loads(d['services'] or '[]')
    return d


# ------------------------------------------------------------------
# PATCH /api/sitting/me — eigenes Profil bearbeiten
# ------------------------------------------------------------------
@router.patch("/me")
async def update_sitter(data: SitterUpdate, user=Depends(get_current_user)):
    with db() as conn:
        sitter = conn.execute(
            "SELECT * FROM sitters WHERE user_id = ?", (user['id'],)
        ).fetchone()
        if not sitter:
            raise HTTPException(404, "Kein Sitter-Profil gefunden.")
        updates = data.model_dump(exclude_none=True)
        if 'services' in updates:
            updates['services'] = json.dumps([s for s in updates['services'] if s in SERVICES])
        if updates:
            cols = ', '.join(f"{k} = ?" for k in updates)
            conn.execute(f"UPDATE sitters SET {cols} WHERE user_id = ?",
                         [*updates.values(), user['id']])
        row = conn.execute("SELECT * FROM sitters WHERE user_id = ?", (user['id'],)).fetchone()
    d = dict(row)
    d['services'] = json.loads(d['services'] or '[]')
    return d


# ------------------------------------------------------------------
# GET /api/sitting/requests — meine Anfragen (als Anfragender)
# ------------------------------------------------------------------
@router.get("/requests")
async def list_my_requests(user=Depends(get_current_user)):
    with db() as conn:
        rows = conn.execute("""
            SELECT sr.*, u.name AS sitter_name
            FROM sitting_requests sr
            JOIN sitters s ON s.id = sr.sitter_id
            JOIN users u ON u.id = s.user_id
            WHERE sr.user_id = ?
            ORDER BY sr.created_at DESC
        """, (user['id'],)).fetchall()
    result = []
    for r in rows:
        d = dict(r)
        d['dog_ids'] = json.loads(d['dog_ids'] or '[]')
        result.append(d)
    return result


# ------------------------------------------------------------------
# GET /api/sitting/inbox — eingehende Anfragen (als Sitter)
# ------------------------------------------------------------------
@router.get("/inbox")
async def sitter_inbox(user=Depends(get_current_user)):
    with db() as conn:
        sitter = conn.execute(
            "SELECT id FROM sitters WHERE user_id = ?", (user['id'],)
        ).fetchone()
        if not sitter:
            return []
        rows = conn.execute("""
            SELECT sr.*, u.name AS anfragender_name
            FROM sitting_requests sr
            JOIN users u ON u.id = sr.user_id
            WHERE sr.sitter_id = ?
            ORDER BY sr.created_at DESC
        """, (sitter['id'],)).fetchall()
    result = []
    for r in rows:
        d = dict(r)
        d['dog_ids'] = json.loads(d['dog_ids'] or '[]')
        result.append(d)
    return result


# ------------------------------------------------------------------
# POST /api/sitting/requests — Anfrage senden
# ------------------------------------------------------------------
@router.post("/requests", status_code=201)
async def create_request(data: RequestCreate, user=Depends(get_current_user)):
    with db() as conn:
        sitter = conn.execute(
            "SELECT * FROM sitters WHERE id = ?", (data.sitter_id,)
        ).fetchone()
        if not sitter or not sitter['aktiv']:
            raise HTTPException(404, "Sitter nicht gefunden oder nicht aktiv.")
        if sitter['user_id'] == user['id']:
            raise HTTPException(400, "Du kannst keine Anfrage an dich selbst schicken.")
        cur = conn.execute("""
            INSERT INTO sitting_requests (user_id, sitter_id, dog_ids, von, bis, nachricht)
            VALUES (?, ?, ?, ?, ?, ?)
        """, (user['id'], data.sitter_id, json.dumps(data.dog_ids),
              data.von, data.bis, data.nachricht))
        row = conn.execute("SELECT * FROM sitting_requests WHERE id = ?", (cur.lastrowid,)).fetchone()
    d = dict(row)
    d['dog_ids'] = json.loads(d['dog_ids'] or '[]')
    return d


# ------------------------------------------------------------------
# PATCH /api/sitting/requests/{id} — Status ändern
# ------------------------------------------------------------------
@router.patch("/requests/{req_id}")
async def update_request(req_id: int, data: RequestUpdate, user=Depends(get_current_user)):
    allowed = {'angenommen', 'abgelehnt', 'abgebrochen'}
    if data.status not in allowed:
        raise HTTPException(400, f"Status muss einer von {allowed} sein.")
    with db() as conn:
        req = conn.execute("SELECT * FROM sitting_requests WHERE id = ?", (req_id,)).fetchone()
        if not req:
            raise HTTPException(404, "Anfrage nicht gefunden.")
        # Anfragender kann nur abbrechen; Sitter kann annehmen/ablehnen
        sitter = conn.execute(
            "SELECT * FROM sitters WHERE id = ?", (req['sitter_id'],)
        ).fetchone()
        is_requester = req['user_id'] == user['id']
        is_sitter    = sitter['user_id'] == user['id']
        if not is_requester and not is_sitter:
            raise HTTPException(403, "Kein Zugriff.")
        if is_requester and data.status != 'abgebrochen':
            raise HTTPException(403, "Du kannst die Anfrage nur abbrechen.")
        if is_sitter and data.status == 'abgebrochen':
            raise HTTPException(403, "Als Sitter kannst du nur annehmen oder ablehnen.")
        conn.execute(
            "UPDATE sitting_requests SET status = ? WHERE id = ?", (data.status, req_id)
        )
        row = conn.execute("SELECT * FROM sitting_requests WHERE id = ?", (req_id,)).fetchone()
    d = dict(row)
    d['dog_ids'] = json.loads(d['dog_ids'] or '[]')
    return d