"""
KPI-Kacheln für Layer-2b Fitness-Dashboard (Issue #53).

Ausgabe für KpiTilesOverview; ``keys`` = Platzhalter-Registry-Referenzen.
"""

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 _minutes_status(minutes: Optional[int]) -> str:
    if minutes is None:
        return "warn"
    if 150 <= minutes <= 300:
        return "good"
    if minutes < 150:
        return "warn" if minutes >= 90 else "bad"
    return "warn"


def _quality_status(pct: Optional[int]) -> str:
    if pct is None:
        return "warn"
    if pct >= 60:
        return "good"
    if pct >= 40:
        return "warn"
    return "bad"


def _score_status(score: Optional[int]) -> str:
    if score is None:
        return "warn"
    if score >= 70:
        return "good"
    if score >= 50:
        return "warn"
    return "bad"


def _vo2_status(trend: Optional[float]) -> str:
    if trend is None:
        return "warn"
    if trend > 0.5:
        return "good"
    if trend >= -0.5:
        return "warn"
    return "bad"


def _vol_delta_status(delta_pct: Optional[float], prior7: int, last7: int) -> str:
    if delta_pct is None:
        if last7 > 0 and prior7 == 0:
            return "good"
        return "warn"
    if delta_pct >= 5:
        return "good"
    if delta_pct >= -10:
        return "warn"
    return "bad"


def build_fitness_progress_insights(
    vol_delta: Dict[str, Any],
    load_meta: Dict[str, Any],
    quality_pct: Optional[int],
) -> List[Dict[str, Any]]:
    """
    Kurz-Aussagen für die UI (Layer 2b), keine zweite Datenquelle.
    """
    out: List[Dict[str, Any]] = []
    if vol_delta.get("has_data"):
        last7 = int(vol_delta.get("last7_min") or 0)
        prev7 = int(vol_delta.get("prior7_min") or 0)
        d = vol_delta.get("delta_pct")
        if d is not None:
            sign = "+" if d > 0 else ""
            body = (
                f"Trainingsminuten letzte 7 Tage ({last7} min) vs. Vorwoche ({prev7} min): "
                f"{sign}{d} %."
            )
        elif last7 > 0 and prev7 == 0:
            body = f"Mehr Volumen als in der Vorwoche: zuletzt {last7} min (Vorwoche 0 min)."
        else:
            body = "Zu wenig Daten für einen Vorwochen-Vergleich."
        out.append(
            {
                "key": "ins_vol_trend",
                "tone": _vol_delta_status(
                    float(d) if d is not None else None, prev7, last7
                ),
                "title": "Volumen-Trend",
                "body": body,
            }
        )

    acwr = load_meta.get("acwr")
    st = load_meta.get("acwr_status")
    if acwr is not None and isinstance(load_meta, dict) and load_meta.get("data_points", 0) > 0:
        if st == "optimal":
            tone = "good"
            hint = "Akute zu chronischer Last (ACWR) liegt im oft empfohlenen Bereich (ca. 0,8–1,3)."
        else:
            tone = "warn"
            hint = (
                "ACWR außerhalb des häufig genannten Zielkorridors — bei anhaltender Belastung "
                "Erholung oder Volumen prüfen (Proxy-Modell)."
            )
        out.append(
            {
                "key": "ins_acwr",
                "tone": tone,
                "title": "Belastungsverhältnis (ACWR)",
                "body": f"Verhältnis akut (7 Tage) zu chronisch (28 Tage): {float(acwr):.2f}. {hint}",
            }
        )

    if quality_pct is not None:
        tone = "good" if quality_pct >= 60 else "warn" if quality_pct >= 40 else "bad"
        out.append(
            {
                "key": "ins_quality",
                "tone": tone,
                "title": "Session-Qualität",
                "body": f"{quality_pct} % der Sessions sind als «gut» oder besser eingestuft — Grundlage für progressive Belastung.",
            }
        )

    return out


def build_fitness_dashboard_kpi_tiles(
    summary: Dict[str, Any],
    minutes_7d: Optional[int],
    quality_pct: Optional[int],
    quality_window_days: int,
    activity_score: Optional[int],
    vo2_trend: Optional[float],
    top_focus: Optional[Dict[str, Any]],
    vol_delta: Optional[Dict[str, Any]] = None,
) -> List[Dict[str, Any]]:
    spw = summary.get("sessions_per_week")
    try:
        spw_f = float(spw) if spw is not None else None
    except (TypeError, ValueError):
        spw_f = None
    spw_s = f"{spw_f:.1f}".replace(".", ",") if spw_f is not None else "—"

    m_status = _minutes_status(minutes_7d)
    q_status = _quality_status(quality_pct)
    s_status = _score_status(activity_score)
    v_status = _vo2_status(vo2_trend)

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

    if vol_delta and vol_delta.get("has_data"):
        d = vol_delta.get("delta_pct")
        last7 = int(vol_delta.get("last7_min") or 0)
        prev7 = int(vol_delta.get("prior7_min") or 0)
        if d is not None:
            sign = "+" if float(d) > 0 else ""
            v_s = f"{sign}{d:.1f} %".replace(".", ",")
            sub = f"{last7} min vs. {prev7} min (7-Tage-Fenster)"
        elif last7 > 0 and prev7 == 0:
            v_s = "neu"
            sub = f"{last7} min letzte Woche"
        else:
            v_s = "—"
            sub = "Vergleich Vorwoche"
        vd_st = _vol_delta_status(float(d) if d is not None else None, prev7, last7)
        tiles.append(
            {
                "key": "volume_vs_prior_week",
                "category": "Volumen vs. Vorwoche",
                "icon": "📈",
                "value": v_s,
                "sublabel": sub,
                "status": vd_st,
                "verdict": _verdict(vd_st),
                "hoverTop": "Fortschritt Trainingsminuten",
                "hoverBody": "Letzte 7 Kalendertage vs. die 7 Tage davor (activity_log).",
                "keys": ["training_minutes_week", "activity_summary"],
            }
        )

    tiles.extend(
        [
            {
                "key": "minutes_week",
                "category": "Minuten (7 Tage)",
                "icon": "⏱",
                "value": f"{minutes_7d} min" if minutes_7d is not None else "—",
                "sublabel": "WHO: 150–300 min/Woche",
                "status": m_status,
                "verdict": _verdict(m_status),
                "hoverTop": "Summe Trainingsminuten (letzte 7 Tage)",
                "hoverBody": "Gleiche Quelle wie Platzhalter training_minutes_week.",
                "keys": ["training_minutes_week", "activity_score"],
            },
            {
                "key": "sessions_per_week",
                "category": "Sessions / Woche",
                "icon": "📅",
                "value": spw_s,
                "sublabel": f"Fenster: {summary.get('days_analyzed', '—')} Tage",
                "status": "good",
                "verdict": "Gut",
                "hoverTop": "Durchschnittliche Sessions pro Woche",
                "hoverBody": "Aus activity_summary (activity_log im gewählten Zeitraum).",
                "keys": ["activity_summary"],
            },
            {
                "key": "quality_pct",
                "category": "Qualitätssessions",
                "icon": "✓",
                "value": f"{quality_pct} %" if quality_pct is not None else "—",
                "sublabel": f"Anteil «gut+» · {quality_window_days} Tage",
                "status": q_status,
                "verdict": _verdict(q_status),
                "hoverTop": "Anteil Sessions mit guter Qualitätslabel-Klassifikation",
                "hoverBody": "Entspricht quality_sessions_pct (Fenster wie gewählt).",
                "keys": ["quality_sessions_pct"],
            },
            {
                "key": "activity_score",
                "category": "Activity-Score",
                "icon": "🎯",
                "value": str(activity_score) if activity_score is not None else "—",
                "sublabel": "Ausrichtung an gewichteten Fokusbereichen",
                "status": s_status,
                "verdict": _verdict(s_status) if activity_score is not None else "Hinweis",
                "hoverTop": "Gewichteter Score (0–100)",
                "hoverBody": "Ohne gewichtete Aktivitäts-Fokusbereiche kein Score.",
                "keys": ["activity_score"],
            },
            {
                "key": "vo2_trend",
                "category": "VO₂max-Trend",
                "icon": "🫁",
                "value": f"{vo2_trend:+.1f}" if vo2_trend is not None else "—",
                "sublabel": "28-Tage-Trend (geschätzt)",
                "status": v_status,
                "verdict": _verdict(v_status) if vo2_trend is not None else "Hinweis",
                "hoverTop": "Trend der VO₂max-Schätzung aus Aktivitätsdaten",
                "hoverBody": "Wie vo2max_trend_28d im Data Layer.",
                "keys": ["vo2max_trend_28d"],
            },
        ]
    )

    if top_focus:
        prog = top_focus.get("progress")
        prog_s = f"{prog} %" if prog is not None else "—"
        w = top_focus.get("weight")
        try:
            w_s = f"{float(w):.0f} %" if w is not None else "—"
        except (TypeError, ValueError):
            w_s = "—"
        tiles.append(
            {
                "key": "top_focus",
                "category": "Schwerpunkt-Fokus",
                "icon": "🔭",
                "value": str(top_focus.get("label") or "—"),
                "sublabel": f"Fortschritt {prog_s} · Gewicht {w_s}",
                "status": "good",
                "verdict": "Gut",
                "hoverTop": "Höchstgewichteter Fokusbereich",
                "hoverBody": "Aus focus_area_definitions + Nutzer-Gewichtungen.",
                "keys": ["top_focus_area_name", "top_focus_area_progress"],
            }
        )

    return tiles