"""
Chart-Daten für Berichts-PDF: dieselbe Logik wie /api/charts/* (Data Layer), ohne HTTP.
"""
from __future__ import annotations

from typing import Any, Callable

from data_layer.activity_metrics import (
    build_training_type_distribution_chart_payload,
    build_training_volume_chart_payload,
)
from data_layer.body_metrics import get_weight_trend_data
from data_layer.nutrition_chart_payloads import build_energy_balance_chart_payload
from data_layer.nutrition_metrics import get_nutrition_average_data
from data_layer.utils import serialize_dates


def _weight_trend_payload(profile_id: str, days: int) -> dict[str, Any]:
    d = min(max(days, 7), 365)
    trend_data = get_weight_trend_data(profile_id, d)
    if trend_data["confidence"] == "insufficient":
        return {
            "chart_type": "line",
            "data": {"labels": [], "datasets": []},
            "metadata": {
                "confidence": "insufficient",
                "data_points": 0,
                "message": "Nicht genug Daten für Trend-Analyse",
            },
        }
    series = trend_data.get("series") or []
    labels = [
        pt["date"].isoformat() if hasattr(pt["date"], "isoformat") else str(pt["date"]) for pt in series
    ]
    values = [pt["weight"] for pt in series]
    return {
        "chart_type": "line",
        "data": {
            "labels": labels,
            "datasets": [
                {
                    "label": "Gewicht",
                    "data": values,
                    "borderColor": "#1D9E75",
                    "backgroundColor": "rgba(29, 158, 117, 0.1)",
                    "borderWidth": 2,
                    "tension": 0.4,
                    "fill": True,
                    "pointRadius": 2,
                }
            ],
        },
        "metadata": serialize_dates(
            {
                "confidence": trend_data["confidence"],
                "data_points": trend_data["data_points"],
                "first_value": trend_data["first_value"],
                "last_value": trend_data["last_value"],
                "delta": trend_data["delta"],
                "direction": trend_data["direction"],
            }
        ),
    }


def _macro_distribution_payload(profile_id: str, days: int) -> dict[str, Any]:
    d = min(max(days, 7), 90)
    macro_data = get_nutrition_average_data(profile_id, d)
    if macro_data["confidence"] == "insufficient":
        return {
            "chart_type": "pie",
            "data": {"labels": [], "datasets": []},
            "metadata": {"confidence": "insufficient", "message": "Keine Ernährungsdaten vorhanden"},
        }
    protein_kcal = macro_data["protein_avg"] * 4
    carbs_kcal = macro_data["carbs_avg"] * 4
    fat_kcal = macro_data["fat_avg"] * 9
    total_kcal = protein_kcal + carbs_kcal + fat_kcal
    if total_kcal == 0:
        return {
            "chart_type": "pie",
            "data": {"labels": [], "datasets": []},
            "metadata": {"confidence": "insufficient", "message": "Keine Makronährstoff-Daten"},
        }
    protein_pct = protein_kcal / total_kcal * 100
    carbs_pct = carbs_kcal / total_kcal * 100
    fat_pct = fat_kcal / total_kcal * 100
    return {
        "chart_type": "pie",
        "data": {
            "labels": ["Protein", "Kohlenhydrate", "Fett"],
            "datasets": [
                {
                    "data": [round(protein_pct, 1), round(carbs_pct, 1), round(fat_pct, 1)],
                    "backgroundColor": ["#1D9E75", "#F59E0B", "#EF4444"],
                    "borderWidth": 2,
                    "borderColor": "#fff",
                }
            ],
        },
        "metadata": {"confidence": macro_data.get("confidence", "high")},
    }


def _training_volume_payload(profile_id: str, window_days: int) -> dict[str, Any]:
    w = max(4, min(52, window_days // 7))
    return build_training_volume_chart_payload(profile_id, w)


_CHART_FETCHERS: dict[str, Callable[[str, int], dict[str, Any]]] = {
    "weight_trend": _weight_trend_payload,
    "energy_balance": lambda pid, d: build_energy_balance_chart_payload(pid, min(max(d, 7), 90)),
    "macro_distribution": _macro_distribution_payload,
    "training_volume": _training_volume_payload,
    "training_type_distribution": lambda pid, d: build_training_type_distribution_chart_payload(
        pid, min(max(d, 7), 90)
    ),
}


def fetch_chart_payload(chart_id: str, profile_id: str, window_days: int) -> dict[str, Any]:
    fn = _CHART_FETCHERS.get(chart_id)
    if not fn:
        raise ValueError(f"Unbekanntes chart_id: {chart_id}")
    return fn(profile_id, window_days)


CHART_CATALOG_FOR_API: list[dict[str, Any]] = [
    {"id": "weight_trend", "title": "Gewichtstrend", "default_window_days": 90, "window_max": 365},
    {"id": "energy_balance", "title": "Energiebilanz", "default_window_days": 28, "window_max": 90},
    {"id": "macro_distribution", "title": "Makroverteilung (Ø)", "default_window_days": 28, "window_max": 90},
    {"id": "training_volume", "title": "Trainingsvolumen (Wochen)", "default_window_days": 84, "window_max": 365},
    {
        "id": "training_type_distribution",
        "title": "Trainingsart-Verteilung",
        "default_window_days": 28,
        "window_max": 90,
    },
]