"""
Weight Tracking Endpoints for Mitai Jinkendo

Handles weight log CRUD operations and statistics.
"""
import uuid
import logging
from typing import Optional

from fastapi import APIRouter, Header, Depends

from db import get_db, get_cursor, r2d
from auth import require_auth, check_feature_access, increment_feature_usage
from models import WeightEntry
from routers.profiles import get_pid

router = APIRouter(prefix="/api/weight", tags=["weight"])
logger = logging.getLogger(__name__)


@router.get("")
def list_weight(limit: int=365, x_profile_id: Optional[str]=Header(default=None), session: dict=Depends(require_auth)):
    """Get weight entries for current profile."""
    pid = get_pid(x_profile_id)
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute(
            "SELECT * FROM weight_log WHERE profile_id=%s ORDER BY date DESC LIMIT %s", (pid,limit))
        return [r2d(r) for r in cur.fetchall()]


@router.post("")
def upsert_weight(e: WeightEntry, x_profile_id: Optional[str]=Header(default=None), session: dict=Depends(require_auth)):
    """Create or update weight entry (upsert by date)."""
    pid = get_pid(x_profile_id)

    # Phase 2: Check feature access (non-blocking, log only)
    access = check_feature_access(pid, 'weight_entries')
    if not access['allowed']:
        logger.warning(
            f"[FEATURE-LIMIT] User {pid} would be blocked: "
            f"weight_entries {access['reason']} (used: {access['used']}, limit: {access['limit']})"
        )
        # NOTE: Phase 2 does NOT block - just logs!

    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("SELECT id FROM weight_log WHERE profile_id=%s AND date=%s", (pid,e.date))
        ex = cur.fetchone()
        is_new_entry = not ex

        if ex:
            # UPDATE existing entry
            cur.execute("UPDATE weight_log SET weight=%s,note=%s WHERE id=%s", (e.weight,e.note,ex['id']))
            wid = ex['id']
        else:
            # INSERT new entry
            wid = str(uuid.uuid4())
            cur.execute("INSERT INTO weight_log (id,profile_id,date,weight,note,created) VALUES (%s,%s,%s,%s,%s,CURRENT_TIMESTAMP)",
                         (wid,pid,e.date,e.weight,e.note))

            # Phase 2: Increment usage counter (only for new entries)
            increment_feature_usage(pid, 'weight_entries')

    return {"id":wid,"date":e.date,"weight":e.weight}


@router.put("/{wid}")
def update_weight(wid: str, e: WeightEntry, x_profile_id: Optional[str]=Header(default=None), session: dict=Depends(require_auth)):
    """Update existing weight entry."""
    pid = get_pid(x_profile_id)
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("UPDATE weight_log SET date=%s,weight=%s,note=%s WHERE id=%s AND profile_id=%s",
                     (e.date,e.weight,e.note,wid,pid))
    return {"id":wid}


@router.delete("/{wid}")
def delete_weight(wid: str, x_profile_id: Optional[str]=Header(default=None), session: dict=Depends(require_auth)):
    """Delete weight entry."""
    pid = get_pid(x_profile_id)
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("DELETE FROM weight_log WHERE id=%s AND profile_id=%s", (wid,pid))
    return {"ok":True}


@router.get("/stats")
def weight_stats(x_profile_id: Optional[str]=Header(default=None), session: dict=Depends(require_auth)):
    """Get weight statistics (last 90 days)."""
    pid = get_pid(x_profile_id)
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("SELECT date,weight FROM weight_log WHERE profile_id=%s ORDER BY date DESC LIMIT 90", (pid,))
        rows = cur.fetchall()
    if not rows: return {"count":0,"latest":None,"prev":None,"min":None,"max":None,"avg_7d":None}
    w=[float(r['weight']) for r in rows]
    return {"count":len(rows),"latest":{"date":rows[0]['date'],"weight":float(rows[0]['weight'])},
            "prev":{"date":rows[1]['date'],"weight":float(rows[1]['weight'])} if len(rows)>1 else None,
            "min":min(w),"max":max(w),"avg_7d":round(sum(w[:7])/min(7,len(w)),2)}