"""Admin BLS catalog import and attribute/food maintenance."""
from __future__ import annotations

from typing import Optional

from fastapi import APIRouter, Depends, File, HTTPException, UploadFile
from pydantic import BaseModel

from auth import require_admin
from bls.import_service import upsert_attributes, upsert_foods
from bls.parser import parse_components_xlsx, parse_foods_xlsx
from db import get_cursor, get_db, r2d

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


class AttributeCreate(BaseModel):
    attr_key: str
    name_de: str
    name_en: Optional[str] = None
    unit: Optional[str] = None
    category: Optional[str] = None
    data_type: str = "num_per_100g"
    enum_values: Optional[list] = None


class ManualFoodCreate(BaseModel):
    name_de: str
    name_en: Optional[str] = None
    macros_per_100g: Optional[dict] = None


@router.get("/status")
def bls_status(session: dict = Depends(require_admin)):
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("SELECT COUNT(*) AS n FROM food_catalog WHERE catalog_kind = 'official_bls'")
        foods = cur.fetchone()["n"]
        cur.execute("SELECT COUNT(*) AS n FROM food_attributes WHERE origin = 'official_bls'")
        attrs = cur.fetchone()["n"]
        cur.execute("SELECT COUNT(*) AS n FROM food_catalog WHERE catalog_kind <> 'official_bls'")
        manual = cur.fetchone()["n"]
        cur.execute("SELECT MAX(updated_at) AS last_updated FROM food_catalog WHERE catalog_kind = 'official_bls'")
        last = cur.fetchone()["last_updated"]
    return {
        "official_foods": foods,
        "official_attributes": attrs,
        "manual_foods": manual,
        "last_updated": last,
        "source": "Max Rubner-Institut, BLS 4.0 (frei verfügbar)",
    }


@router.post("/import/components")
async def import_components(
    file: UploadFile = File(...),
    dry_run: bool = True,
    session: dict = Depends(require_admin),
):
    raw = await file.read()
    if not raw:
        raise HTTPException(400, "Leere Datei")
    try:
        attrs = parse_components_xlsx(raw)
    except Exception as e:
        raise HTTPException(400, f"Components-Datei unlesbar: {e}") from e
    if dry_run:
        return {"dry_run": True, "attributes": len(attrs), "sample": attrs[:8]}
    with get_db() as conn:
        cur = get_cursor(conn)
        stats = upsert_attributes(cur, attrs)
    return {"dry_run": False, **stats}


@router.post("/import/foods")
async def import_foods(
    file: UploadFile = File(...),
    dry_run: bool = True,
    session: dict = Depends(require_admin),
):
    raw = await file.read()
    if not raw:
        raise HTTPException(400, "Leere Datei")
    try:
        parsed = parse_foods_xlsx(raw)
    except Exception as e:
        raise HTTPException(400, f"Datendatei unlesbar: {e}") from e
    foods = parsed["foods"]
    if dry_run:
        return {
            "dry_run": True,
            "foods": len(foods),
            "attribute_columns": len(parsed["attribute_headers"]),
            "sample": [
                {"bls_code": f["bls_code"], "name_de": f["name_de"]}
                for f in foods[:8]
            ],
        }
    with get_db() as conn:
        cur = get_cursor(conn)
        stats = upsert_foods(cur, foods)
    return {"dry_run": False, **stats}


@router.get("/foods")
def admin_list_foods(
    q: Optional[str] = None,
    kind: Optional[str] = None,
    limit: int = 50,
    session: dict = Depends(require_admin),
):
    limit = min(max(limit, 1), 200)
    with get_db() as conn:
        cur = get_cursor(conn)
        conds = ["is_active = true"]
        params: list = []
        if kind:
            conds.append("catalog_kind = %s")
            params.append(kind)
        if q:
            conds.append("(name_de ILIKE %s OR COALESCE(name_en,'') ILIKE %s OR COALESCE(bls_code,'') ILIKE %s)")
            like = f"%{q}%"
            params.extend([like, like, like])
        params.append(limit)
        cur.execute(
            f"""
            SELECT id, bls_code, name_de, name_en, catalog_kind, food_group, bls_version
            FROM food_catalog
            WHERE {' AND '.join(conds)}
            ORDER BY name_de
            LIMIT %s
            """,
            params,
        )
        return [r2d(r) for r in cur.fetchall()]


@router.get("/foods/{food_id}")
def admin_food_detail(food_id: str, session: dict = Depends(require_admin)):
    from data_layer.nutrition_items import resolve_food_attributes

    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("SELECT * FROM food_catalog WHERE id = %s", (food_id,))
        row = cur.fetchone()
        if not row:
            raise HTTPException(404, "Lebensmittel nicht gefunden")
        attrs = resolve_food_attributes(cur, food_id)
    return {**r2d(row), "attributes": attrs}


@router.post("/foods/manual")
def admin_create_manual_food(body: ManualFoodCreate, session: dict = Depends(require_admin)):
    from data_layer.food_mapping import normalize_food_name

    name = (body.name_de or "").strip()
    if not name:
        raise HTTPException(400, "Name fehlt")
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute(
            """
            INSERT INTO food_catalog (name_de, name_en, catalog_kind, source, external_key)
            VALUES (%s, %s, 'manual_admin', 'manual', %s)
            RETURNING *
            """,
            (name, body.name_en, f"man-admin-{normalize_food_name(name)[:40]}"),
        )
        food = r2d(cur.fetchone())
        _write_manual_macros(cur, food["id"], body.macros_per_100g)
    return food


@router.get("/attributes")
def admin_list_attributes(session: dict = Depends(require_admin)):
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute(
            """
            SELECT id, attr_key, name_de, name_en, unit, category, data_type, origin, sort_order
            FROM food_attributes
            WHERE is_active = true
            ORDER BY origin, sort_order, attr_key
            """
        )
        return [r2d(r) for r in cur.fetchall()]


@router.post("/attributes")
def admin_create_attribute(body: AttributeCreate, session: dict = Depends(require_admin)):
    key = body.attr_key.strip().upper().replace(" ", "_")
    if not key:
        raise HTTPException(400, "attr_key fehlt")
    if body.data_type not in ("num_per_100g", "boolean", "text", "enum"):
        raise HTTPException(400, "Ungültiger data_type")
    with get_db() as conn:
        cur = get_cursor(conn)
        try:
            cur.execute(
                """
                INSERT INTO food_attributes
                    (attr_key, name_de, name_en, unit, category, data_type, enum_values, origin, sort_order)
                VALUES (%s, %s, %s, %s, %s, %s, %s, 'extension', 9000)
                RETURNING *
                """,
                (
                    key, body.name_de, body.name_en, body.unit, body.category,
                    body.data_type, None if not body.enum_values else body.enum_values,
                ),
            )
        except Exception as e:
            raise HTTPException(409, f"Attribut existiert bereits oder ist ungültig: {e}") from e
        return r2d(cur.fetchone())


def _write_manual_macros(cur, food_id: str, macros: dict | None) -> None:
    if not macros:
        return
    mapping = {"kcal": "ENERCC", "protein_g": "PROT625", "fat_g": "FAT", "carbs_g": "CHO"}
    for field, key in mapping.items():
        if field not in macros or macros[field] is None:
            continue
        cur.execute("SELECT id FROM food_attributes WHERE attr_key = %s", (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"], float(macros[field])),
        )