"""Catalog attribute definitions and numeric values (BLS EAV + extensions)."""
from __future__ import annotations

from typing import Any

MACRO_TO_KEY = {
    "kcal": "ENERCC",
    "protein_g": "PROT625",
    "fat_g": "FAT",
    "carbs_g": "CHO",
}


def scale_to_per_100g(value: float, serving_g: float | None) -> float:
    if not serving_g or serving_g <= 0 or serving_g == 100:
        return float(value)
    return float(value) * (100.0 / float(serving_g))


def list_numeric_attributes(cur, query: str = "", limit: int = 40) -> list[dict[str, Any]]:
    q = (query or "").strip()
    lim = min(max(int(limit or 40), 1), 80)
    if q:
        like = f"%{q}%"
        cur.execute(
            """
            SELECT id, attr_key, name_de, name_en, unit, category, origin
            FROM food_attributes
            WHERE is_active = true AND data_type = 'num_per_100g'
              AND (
                  attr_key ILIKE %s OR name_de ILIKE %s
                  OR COALESCE(name_en, '') ILIKE %s
              )
            ORDER BY
                CASE WHEN attr_key ILIKE %s THEN 0
                     WHEN name_de ILIKE %s THEN 1
                     ELSE 2 END,
                sort_order, attr_key
            LIMIT %s
            """,
            (like, like, like, q, f"{q}%", lim),
        )
    else:
        cur.execute(
            """
            SELECT id, attr_key, name_de, name_en, unit, category, origin
            FROM food_attributes
            WHERE is_active = true AND data_type = 'num_per_100g'
            ORDER BY sort_order, attr_key
            LIMIT %s
            """,
            (lim,),
        )
    return [dict(r) for r in cur.fetchall()]


def write_numeric_attributes(cur, food_id: str, values: dict[str, Any] | None) -> int:
    if not values:
        return 0
    written = 0
    for raw_key, raw_val in values.items():
        key = str(raw_key or "").strip()
        if not key or raw_val is None or raw_val == "":
            continue
        try:
            num = float(raw_val)
        except (TypeError, ValueError):
            continue
        cur.execute(
            """
            SELECT id FROM food_attributes
            WHERE attr_key = %s AND is_active = true AND data_type = 'num_per_100g'
            """,
            (key,),
        )
        row = cur.fetchone()
        if not row:
            continue
        cur.execute(
            """
            INSERT INTO food_attribute_values (food_id, attribute_id, value_num, is_trace)
            VALUES (%s, %s, %s, false)
            ON CONFLICT (food_id, attribute_id)
            DO UPDATE SET value_num = EXCLUDED.value_num, updated_at = NOW()
            """,
            (food_id, row["id"], num),
        )
        written += 1
    return written


def macros_and_attributes_to_values(
    macros: dict[str, Any] | None,
    attributes: dict[str, Any] | None,
    serving_g: float | None = None,
) -> dict[str, float]:
    out: dict[str, float] = {}
    for field, key in MACRO_TO_KEY.items():
        if not macros or field not in macros or macros[field] is None or macros[field] == "":
            continue
        try:
            out[key] = scale_to_per_100g(float(macros[field]), serving_g)
        except (TypeError, ValueError):
            continue
    for key, raw in (attributes or {}).items():
        if raw is None or raw == "":
            continue
        try:
            out[str(key)] = scale_to_per_100g(float(raw), serving_g)
        except (TypeError, ValueError):
            continue
    return out


def extra_attributes_for_food(cur, food_id: str) -> dict[str, float]:
    cur.execute(
        """
        SELECT a.attr_key, v.value_num
        FROM food_attribute_values v
        JOIN food_attributes a ON a.id = v.attribute_id
        WHERE v.food_id = %s AND a.data_type = 'num_per_100g'
          AND v.value_num IS NOT NULL AND v.is_trace = false
          AND NOT (a.attr_key = ANY(%s))
        ORDER BY a.sort_order, a.attr_key
        """,
        (food_id, list(MACRO_TO_KEY.values())),
    )
    return {r["attr_key"]: float(r["value_num"]) for r in cur.fetchall()}