"""
Strukturierter PDF-Bericht (Profil v1): GET/PUT Profil, Katalog, PDF-Erzeugung.

Trennung vom Dashboard-Layout; Daten aus data_layer wie /api/charts.
PDF-Zähler: data_export (wie andere Exporte).
"""
from __future__ import annotations

import logging
from datetime import datetime

from fastapi import APIRouter, Depends, HTTPException
from fastapi.responses import Response
from psycopg2.extras import Json

from auth import check_feature_access, increment_feature_usage, require_auth
from db import get_cursor, get_db
from feature_logger import log_feature_usage
from report_chart_fetch import CHART_CATALOG_FOR_API
from report_pdf_render import build_structured_report_pdf
from report_profile_schema import (
    ALLOWED_VIZ_BUNDLE_IDS,
    ReportProfilePayload,
    default_report_profile_dict,
    parse_report_profile,
)

router = APIRouter(prefix="/api/reports", tags=["reports"])
logger = logging.getLogger(__name__)


@router.get("/catalog")
def get_reports_catalog(session: dict = Depends(require_auth)):
    """Metadaten für UI: verfügbare Diagramme und Blocktypen."""
    viz_titles = {
        "body_history_viz": "Körper (Verlauf-Bundle)",
        "nutrition_history_viz": "Ernährung (Verlauf-Bundle)",
        "fitness_history_viz": "Fitness (Verlauf-Bundle)",
        "recovery_history_viz": "Erholung (Verlauf-Bundle)",
        "history_overview_viz": "Gesamtübersicht (Korrelationen)",
    }
    return {
        "catalog_version": 2,
        "charts": CHART_CATALOG_FOR_API,
        "viz_bundles": [{"id": bid, "title": viz_titles.get(bid, bid)} for bid in sorted(ALLOWED_VIZ_BUNDLE_IDS)],
        "block_types": [
            {"id": "section", "title": "Überschrift"},
            {"id": "viz_bundle", "title": "Verlauf-Bundle (KPIs & Charts)"},
            {"id": "chart", "title": "Einzel-Diagramm (Legacy)"},
            {"id": "ai_insight", "title": "KI-Auswertung"},
        ],
    }


def _fetch_payload_row(profile_id: str) -> dict | None:
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("SELECT payload FROM report_profiles WHERE profile_id = %s", (profile_id,))
        row = cur.fetchone()
        if not row:
            return None
        p = row.get("payload")
        return p if isinstance(p, dict) else None


def _profile_display_name(profile_id: str) -> str:
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("SELECT name FROM profiles WHERE id = %s", (profile_id,))
        row = cur.fetchone()
        if not row:
            return "Profil"
        return (row.get("name") or "Profil").strip() or "Profil"


@router.get("/profile")
def get_report_profile(session: dict = Depends(require_auth)):
    pid = session["profile_id"]
    raw = _fetch_payload_row(pid)
    if raw is None:
        return {"stored": False, "profile": default_report_profile_dict()}
    try:
        parse_report_profile(raw)
    except Exception as e:
        logger.warning("report profile invalid for %s: %s", pid, e)
        return {"stored": False, "profile": default_report_profile_dict(), "previous_invalid": True}
    return {"stored": True, "profile": raw}


@router.put("/profile")
def put_report_profile(body: dict, session: dict = Depends(require_auth)):
    pid = session["profile_id"]
    try:
        parsed = ReportProfilePayload.model_validate(body)
    except Exception as e:
        raise HTTPException(status_code=400, detail=str(e))

    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute(
            """
            INSERT INTO report_profiles (profile_id, payload, updated_at)
            VALUES (%s, %s, CURRENT_TIMESTAMP)
            ON CONFLICT (profile_id) DO UPDATE SET
              payload = EXCLUDED.payload,
              updated_at = CURRENT_TIMESTAMP
            """,
            (pid, Json(parsed.to_stored_dict())),
        )
        conn.commit()
    return {"ok": True, "profile": parsed.to_stored_dict()}


@router.delete("/profile")
def delete_report_profile(session: dict = Depends(require_auth)):
    """Zurück auf Code-Standard (kein DB-Eintrag)."""
    pid = session["profile_id"]
    with get_db() as conn:
        cur = get_cursor(conn)
        cur.execute("DELETE FROM report_profiles WHERE profile_id = %s", (pid,))
        conn.commit()
    return {"ok": True, "profile": default_report_profile_dict()}


@router.post("/generate-pdf")
def generate_structured_report_pdf(session: dict = Depends(require_auth)):
    pid = session["profile_id"]

    access = check_feature_access(pid, "data_export")
    log_feature_usage(pid, "data_export", access, "report_generate_pdf")
    if not access["allowed"]:
        logger.warning(
            "[FEATURE-LIMIT] report pdf blocked: %s used=%s limit=%s",
            pid,
            access.get("used"),
            access.get("limit"),
        )
        raise HTTPException(
            status_code=403,
            detail=(
                "Limit erreicht: Daten-Export nicht möglich "
                f"({access.get('used')}/{access.get('limit')})."
            ),
        )

    raw = _fetch_payload_row(pid)
    try:
        payload = parse_report_profile(raw)
    except Exception as e:
        raise HTTPException(status_code=400, detail=f"Berichtsprofil ungültig: {e}")

    name = _profile_display_name(pid)
    try:
        pdf_bytes = build_structured_report_pdf(profile_id=pid, profile_name=name, payload=payload)
    except Exception as e:
        logger.exception("report pdf build failed")
        raise HTTPException(status_code=500, detail=f"PDF-Erzeugung fehlgeschlagen: {e}")

    increment_feature_usage(pid, "data_export")
    safe_name = "".join(c for c in name if c.isalnum() or c in (" ", "-", "_")).strip() or "profil"
    fn = f"mitai-bericht-{safe_name.replace(' ', '-')}-{datetime.now().strftime('%Y-%m-%d')}.pdf"
    return Response(
        content=pdf_bytes,
        media_type="application/pdf",
        headers={"Content-Disposition": f'attachment; filename="{fn}"'},
    )