"""Apply parsed BLS 4.0 data: upsert attributes and foods, never delete official rows."""
from __future__ import annotations

from typing import Any


def upsert_attributes(cur, attributes: list[dict[str, Any]]) -> dict[str, int]:
    inserted = updated = 0
    for a in attributes:
        cur.execute(
            """
            INSERT INTO food_attributes
                (attr_key, name_de, name_en, unit, category, data_type, origin, sort_order, updated_at)
            VALUES (%s, %s, %s, %s, %s, %s, 'official_bls', %s, NOW())
            ON CONFLICT (attr_key) DO UPDATE SET
                name_de = EXCLUDED.name_de,
                name_en = COALESCE(EXCLUDED.name_en, food_attributes.name_en),
                unit = COALESCE(EXCLUDED.unit, food_attributes.unit),
                category = COALESCE(EXCLUDED.category, food_attributes.category),
                sort_order = EXCLUDED.sort_order,
                updated_at = NOW()
            WHERE food_attributes.origin = 'official_bls'
            RETURNING (xmax = 0) AS inserted
            """,
            (
                a["attr_key"], a["name_de"], a.get("name_en"), a.get("unit"),
                a.get("category"), a.get("data_type") or "num_per_100g",
                a.get("sort_order") or 0,
            ),
        )
        row = cur.fetchone()
        if row and row.get("inserted"):
            inserted += 1
        else:
            updated += 1
    return {"inserted": inserted, "updated": updated, "total": len(attributes)}


def upsert_foods(cur, foods: list[dict[str, Any]], bls_version: str = "4.0") -> dict[str, int]:
    cur.execute("SELECT attr_key, id FROM food_attributes")
    attr_ids = {r["attr_key"]: r["id"] for r in cur.fetchall()}
    inserted = updated = values_written = 0
    for f in foods:
        code = f["bls_code"]
        cur.execute("SELECT id FROM food_catalog WHERE bls_code = %s", (code,))
        existing = cur.fetchone()
        if existing:
            food_id = existing["id"]
            cur.execute(
                """
                UPDATE food_catalog
                SET name_de=%s, name_en=%s, food_group=%s, bls_version=%s,
                    catalog_kind='official_bls', source='bls_4.0', is_active=true, updated_at=NOW()
                WHERE id=%s AND catalog_kind='official_bls'
                """,
                (f["name_de"], f.get("name_en"), f.get("food_group"), bls_version, food_id),
            )
            updated += 1
        else:
            cur.execute(
                """
                INSERT INTO food_catalog
                    (bls_code, name_de, name_en, food_group, catalog_kind, bls_version, source)
                VALUES (%s, %s, %s, %s, 'official_bls', %s, 'bls_4.0')
                RETURNING id
                """,
                (code, f["name_de"], f.get("name_en"), f.get("food_group"), bls_version),
            )
            food_id = cur.fetchone()["id"]
            inserted += 1
        for val in f.get("values") or []:
            aid = attr_ids.get(val["attr_key"])
            if not aid:
                continue
            if val.get("is_trace"):
                cur.execute(
                    """
                    INSERT INTO food_attribute_values
                        (food_id, attribute_id, value_num, is_trace, origin_code, reference_text, updated_at)
                    VALUES (%s, %s, NULL, true, %s, %s, NOW())
                    ON CONFLICT (food_id, attribute_id) DO UPDATE SET
                        value_num = NULL, is_trace = true,
                        origin_code = EXCLUDED.origin_code,
                        reference_text = EXCLUDED.reference_text,
                        updated_at = NOW()
                    """,
                    (food_id, aid, val.get("origin_code"), val.get("reference_text")),
                )
            elif val.get("value_num") is None:
                cur.execute(
                    """
                    INSERT INTO food_attribute_values
                        (food_id, attribute_id, value_num, is_trace, origin_code, reference_text, updated_at)
                    VALUES (%s, %s, NULL, false, %s, %s, NOW())
                    ON CONFLICT (food_id, attribute_id) DO UPDATE SET
                        value_num = NULL, is_trace = false,
                        origin_code = EXCLUDED.origin_code,
                        reference_text = EXCLUDED.reference_text,
                        updated_at = NOW()
                    """,
                    (food_id, aid, val.get("origin_code"), val.get("reference_text")),
                )
            else:
                cur.execute(
                    """
                    INSERT INTO food_attribute_values
                        (food_id, attribute_id, value_num, is_trace, origin_code, reference_text, updated_at)
                    VALUES (%s, %s, %s, false, %s, %s, NOW())
                    ON CONFLICT (food_id, attribute_id) DO UPDATE SET
                        value_num = EXCLUDED.value_num, is_trace = false,
                        origin_code = EXCLUDED.origin_code,
                        reference_text = EXCLUDED.reference_text,
                        updated_at = NOW()
                    """,
                    (
                        food_id, aid, val["value_num"],
                        val.get("origin_code"), val.get("reference_text"),
                    ),
                )
            values_written += 1
    return {
        "foods_inserted": inserted,
        "foods_updated": updated,
        "values_written": values_written,
        "foods_total": len(foods),
    }