"""
Interpretation + KPI-Kacheln für Layer 2b Ernährungs-Verlauf.

Gleiche Schwellen wie zuvor im Frontend (History.jsx); Ausgabe strukturiert
für KpiTilesOverview (keys = related_placeholder_keys).
"""

from __future__ import annotations

from typing import Any, Dict, List, Optional


def _verdict(status: str) -> str:
    if status == "good":
        return "Gut"
    if status == "warn":
        return "Hinweis"
    return "Achtung"


def build_nutrition_history_kpi_tiles(
    navg: Dict[str, Any],
    targets: Dict[str, Any],
    date_span_label: str,
    n_days_with_entries: int,
) -> List[Dict[str, Any]]:
    """
    KPI-Kacheln wie buildNutritionKpiTiles im Frontend (Kalorien/KH/Fett + Regeln).
    """
    kcal_avg = round(float(navg.get("kcal_avg") or 0))
    avg_carbs = round(float(navg.get("carbs_avg") or 0) * 10) / 10
    avg_fat = round(float(navg.get("fat_avg") or 0) * 10) / 10
    avg_protein = round(float(navg.get("protein_avg") or 0) * 10) / 10

    pt_low = round(float(targets.get("protein_target_low") or 0))
    pt_high = round(float(targets.get("protein_target_high") or 0))
    targets_ok = targets.get("confidence") != "insufficient" and pt_low > 0
    protein_ok = targets_ok and avg_protein >= pt_low

    total_macro_kcal = avg_protein * 4 + avg_carbs * 4 + avg_fat * 9
    prot_pct = (
        round(avg_protein * 4 / total_macro_kcal * 100)
        if total_macro_kcal > 0
        else 0
    )
    kh_pct = (
        round(avg_carbs * 4 / total_macro_kcal * 100)
        if total_macro_kcal > 0
        else 0
    )
    fat_pct = (
        round(avg_fat * 9 / total_macro_kcal * 100)
        if total_macro_kcal > 0
        else 0
    )

    tiles: List[Dict[str, Any]] = [
        {
            "key": "kcal",
            "category": "Kalorien (Ø)",
            "icon": "🔥",
            "value": f"{kcal_avg} kcal",
            "sublabel": date_span_label,
            "status": "good",
            "verdict": "Gut",
            "hoverTop": "Durchschnittliche tägliche Energie",
            "hoverBody": f"Mittel über {n_days_with_entries} Tage mit Ernährungseinträgen im gewählten Zeitraum.",
            "keys": ["nutrition_score"],
        },
        {
            "key": "carbs",
            "category": "KH (Ø)",
            "icon": "🌾",
            "value": f"{avg_carbs} g",
            "sublabel": "Kohlenhydrate / Tag",
            "status": "good",
            "verdict": "Gut",
            "hoverTop": "Durchschnittliche Kohlenhydrate",
            "hoverBody": "Summe der täglichen Werte im Zeitraum, gemittelt.",
            "keys": ["nutrition_summary"],
        },
        {
            "key": "fat",
            "category": "Fett (Ø)",
            "icon": "🧈",
            "value": f"{avg_fat} g",
            "sublabel": "Fett / Tag",
            "status": "good",
            "verdict": "Gut",
            "hoverTop": "Durchschnittliches Fett",
            "hoverBody": "Summe der täglichen Werte im Zeitraum, gemittelt.",
            "keys": ["nutrition_summary"],
        },
    ]

    if not targets_ok:
        tiles.append(
            {
                "key": "eval-protein",
                "category": "Protein",
                "icon": "🥩",
                "value": f"{avg_protein}g",
                "sublabel": "Referenzgewicht fehlt",
                "status": "warn",
                "verdict": _verdict("warn"),
                "hint": "Ohne aktuelles Körpergewicht lässt sich das Protein-Ziel (g/kg) nicht bewerten.",
                "hoverTop": "Protein-Ziel nicht berechenbar",
                "hoverBody": "Für 1,6–2,2 g/kg wird ein aktuelles Körpergewicht benötigt.",
                "keys": ["protein_adequacy"],
            }
        )
    elif not protein_ok:
        miss = max(0, pt_low - round(avg_protein))
        tiles.append(
            {
                "key": "eval-protein",
                "category": "Protein",
                "icon": "🥩",
                "value": f"{avg_protein}g",
                "sublabel": f"Unterversorgung: {avg_protein}g/Tag (Ziel {pt_low}–{pt_high}g)",
                "status": "bad",
                "verdict": _verdict("bad"),
                "hint": (
                    f"~{miss} g Protein/Tag fehlen – bei Defizit Muskelerhalt gefährdet."
                ),
                "hoverTop": f"Unterversorgung: {avg_protein}g/Tag (Ziel {pt_low}–{pt_high}g)",
                "hoverBody": (
                    f"1,6–2,2g/kg KG. Fehlend: ~{miss}g täglich. "
                    "Konsequenz: Muskelverlust bei Defizit."
                ),
                "keys": ["protein_adequacy", "nutrition_score"],
            }
        )
    else:
        tiles.append(
            {
                "key": "eval-protein",
                "category": "Protein",
                "icon": "🥩",
                "value": f"{avg_protein}g",
                "sublabel": f"Gut: {avg_protein}g/Tag (Ziel {pt_low}–{pt_high}g)",
                "status": "good",
                "verdict": _verdict("good"),
                "hoverTop": f"Gut: {avg_protein}g/Tag (Ziel {pt_low}–{pt_high}g)",
                "hoverBody": "Ausreichend für Muskelerhalt und -aufbau.",
                "keys": ["protein_adequacy", "nutrition_score"],
            }
        )

    if prot_pct < 20 and total_macro_kcal > 0:
        tiles.append(
            {
                "key": "eval-macro-pct",
                "category": "Makro-Anteil",
                "icon": "📊",
                "value": f"{prot_pct}%",
                "sublabel": f"Protein-Anteil niedrig: {prot_pct}% der Kalorien",
                "status": "warn",
                "verdict": _verdict("warn"),
                "hint": (
                    f"Protein-Kalorienanteil niedrig (P {prot_pct} % / KH {kh_pct} % / F {fat_pct} %); "
                    "Ziel oft 25–35 %."
                ),
                "hoverTop": f"Protein-Anteil niedrig: {prot_pct}% der Kalorien",
                "hoverBody": (
                    f"Empfehlung oft 25–35%. Aktuell: {prot_pct}% P / {kh_pct}% KH / {fat_pct}% F"
                ),
                "keys": ["nutrition_summary"],
            }
        )

    return tiles


def build_energy_availability_kpi_tile(ea: Dict[str, Any]) -> Optional[Dict[str, Any]]:
    """E5: nur bei caution/warning — gleiche Daten wie /charts/energy-availability-warning."""
    level = str(ea.get("warning_level") or "none").strip().lower()
    if level == "none":
        return None
    triggers: List[str] = list(ea.get("triggers") or [])
    msg = str(ea.get("message") or "").strip()
    st = "bad" if level == "warning" else "warn"
    first = triggers[0] if triggers else msg
    if len(first) > 90:
        first = first[:87] + "…"
    meta = ea.get("metadata") if isinstance(ea.get("metadata"), dict) else {}
    note = str(meta.get("note") or "")
    hover_lines = [msg] + [f"• {t}" for t in triggers]
    if note:
        hover_lines.append(note)
    return {
        "key": "energy-availability-e5",
        "category": "Energieverfügbarkeit",
        "icon": "⚡",
        "value": "Achtung" if level == "warning" else "Hinweis",
        "sublabel": first or "Signale prüfen",
        "status": st,
        "verdict": _verdict(st),
        "hint": msg,
        "hoverTop": "Energieverfügbarkeit (Heuristik)",
        "hoverBody": "\n".join(hover_lines),
        "keys": ["nutrition_score"],
    }


def build_macro_donut_from_averages(navg: Dict[str, Any]) -> Optional[List[Dict[str, Any]]]:
    """Anteile in % der Makro-kcal + Gramm für Legende."""
    p = float(navg.get("protein_avg") or 0)
    c = float(navg.get("carbs_avg") or 0)
    f = float(navg.get("fat_avg") or 0)
    pkcal, ckcal, fkcal = p * 4, c * 4, f * 9
    tot = pkcal + ckcal + fkcal
    if tot <= 0:
        return None
    return [
        {"name": "Protein", "value": round(pkcal / tot * 100), "color": "#4a8f72", "grams": round(p, 1)},
        {"name": "KH", "value": round(ckcal / tot * 100), "color": "#c17d45", "grams": round(c, 1)},
        {"name": "Fett", "value": round(fkcal / tot * 100), "color": "#6e8eb8", "grams": round(f, 1)},
    ]


def build_nutrition_correlation_heuristic_items(
    merged_rows: List[Dict[str, Any]],
    tdee_kcal: float,
    protein_target_low_g: float,
) -> List[Dict[str, Any]]:
    """
    Heuristische Kurz-Aussagen (vormals Reiter «Korrelation») — gleiche Logik wie History.jsx,
    TDEE aber aus Data-Layer (nutrition_metrics / estimate_tdee), nicht ×1,4 im Frontend.
    """
    filtered = [
        r
        for r in merged_rows
        if r.get("kcal") is not None and r.get("weight") is not None
    ]
    if len(filtered) < 5:
        return []

    td = float(tdee_kcal)
    latest_w = float(filtered[-1].get("weight") or 0) or 80.0
    pt_low = round(float(protein_target_low_g or 0)) or max(1, round(latest_w * 1.6))

    items: List[Dict[str, Any]] = []

    if len(filtered) >= 14:
        high_k = [d for d in filtered if float(d.get("kcal") or 0) > td + 200]
        low_k = [d for d in filtered if float(d.get("kcal") or 0) < td - 200]
        if len(high_k) >= 3 and len(low_k) >= 3:
            avg_wh = sum(float(d["weight"]) for d in high_k) / len(high_k)
            avg_wl = sum(float(d["weight"]) for d in low_k) / len(low_k)
            avg_wh_r = round(avg_wh * 10) / 10
            avg_wl_r = round(avg_wl * 10) / 10
            items.append(
                {
                    "icon": "📊",
                    "status": "good" if avg_wl < avg_wh else "warn",
                    "title": (
                        f"Kalorienreduktion wirkt: Ø {avg_wl_r} kg bei Defizit vs. {avg_wh_r} kg bei Überschuss"
                        if avg_wl < avg_wh
                        else "Kein klarer Kalorieneffekt auf Gewicht erkennbar"
                    ),
                    "detail": (
                        f"Tage mit Überschuss (>{int(td + 200)} kcal): Ø {avg_wh_r} kg · "
                        f"Tage mit Defizit (<{int(td - 200)} kcal): Ø {avg_wl_r} kg"
                    ),
                }
            )

    prot_vs_lean = [
        d
        for d in filtered
        if d.get("protein_g") is not None and d.get("lean_mass") is not None
    ]
    if len(prot_vs_lean) >= 3:
        high_p = [d for d in prot_vs_lean if float(d.get("protein_g") or 0) >= pt_low]
        low_p = [d for d in prot_vs_lean if float(d.get("protein_g") or 0) < pt_low]
        if len(high_p) >= 2 and len(low_p) >= 2:
            avg_lh = sum(float(d["lean_mass"]) for d in high_p) / len(high_p)
            avg_ll = sum(float(d["lean_mass"]) for d in low_p) / len(low_p)
            avg_lh_r = round(avg_lh * 10) / 10
            avg_ll_r = round(avg_ll * 10) / 10
            items.append(
                {
                    "icon": "🥩",
                    "status": "good" if avg_lh >= avg_ll else "warn",
                    "title": (
                        f"Hohe Proteinzufuhr (≥{pt_low} g): Ø {avg_lh_r} kg Mager · Niedrig: Ø {avg_ll_r} kg"
                    ),
                    "detail": (
                        f"{len(high_p)} Messpunkte mit hoher vs. {len(low_p)} mit niedriger Proteinzufuhr verglichen."
                    ),
                }
            )

    balances = [float(d["kcal"]) - td for d in filtered if d.get("kcal") is not None]
    avg_balance = int(round(sum(balances) / len(balances))) if balances else 0
    ab_s = f"{avg_balance:+d}" if avg_balance > 0 else str(avg_balance)
    if avg_balance < -100:
        ic, st = "✅", "good"
    elif avg_balance > 200:
        ic, st = "⬆️", "warn" if avg_balance > 300 else "good"
    else:
        ic, st = "➡️", "good"

    if avg_balance < -500:
        bal_detail = "Starkes Defizit – Muskelerhalt durch ausreichend Protein sicherstellen."
    elif avg_balance < -100:
        bal_detail = "Moderates Defizit – ideal für Fettabbau bei Muskelerhalt."
    elif avg_balance > 300:
        bal_detail = "Kalorienüberschuss – günstig für Muskelaufbau, Fettzunahme möglich."
    else:
        bal_detail = "Nahezu ausgeglichen – Gewicht sollte stabil bleiben."

    items.append(
        {
            "icon": ic,
            "status": st,
            "title": f"Ø Kalorienbilanz: {ab_s} kcal/Tag",
            "detail": f"Geschätzter TDEE: {int(round(td))} kcal (Data-Layer, konsistent mit Verlauf). {bal_detail}",
        }
    )

    return items