# -*- coding: utf-8 -*-
"""
plan_router.py – v0.12.2 (WP-15)

Minimal-CRUD für Plan-Templates & Pläne (POST/GET) + Idempotenz via Fingerprint.
NEU/Änderungen ggü. v0.12.0:
- GET /plan_templates (Liste/Filter)
- GET /plans (Liste/Filter)
- Fix: Filter `section` bei `/plans` nutzt materialisierte `plan_section_names`
- POST /plan materialisiert `plan_section_names` automatisch
- Ausführlichere Swagger-Doku
"""
from fastapi import APIRouter, HTTPException, Query
from pydantic import BaseModel, Field
from typing import List, Optional, Dict, Any
from uuid import uuid4
from datetime import datetime, timezone
import hashlib
import json
import os

from clients import model, qdrant
from qdrant_client.models import PointStruct, Filter, FieldCondition, MatchValue, VectorParams, Distance

router = APIRouter(tags=["plans"])

# -----------------
# Konfiguration
# -----------------
PLAN_COLLECTION = os.getenv("PLAN_COLLECTION") or os.getenv("QDRANT_COLLECTION_PLANS", "plans")
PLAN_TEMPLATE_COLLECTION = os.getenv("PLAN_TEMPLATE_COLLECTION", "plan_templates")
PLAN_SESSION_COLLECTION = os.getenv("PLAN_SESSION_COLLECTION", "plan_sessions")
EXERCISE_COLLECTION = os.getenv("EXERCISE_COLLECTION", "exercises")

# -----------------
# Modelle
# -----------------
class TemplateSection(BaseModel):
    name: str
    target_minutes: int
    must_keywords: List[str] = []
    ideal_keywords: List[str] = []
    supplement_keywords: List[str] = []
    forbid_keywords: List[str] = []
    capability_targets: Dict[str, int] = {}

class PlanTemplate(BaseModel):
    id: str = Field(default_factory=lambda: str(uuid4()))
    name: str
    discipline: str
    age_group: str
    target_group: str
    total_minutes: int
    sections: List[TemplateSection] = []
    goals: List[str] = []
    equipment_allowed: List[str] = []
    created_by: str
    version: str

class PlanItem(BaseModel):
    exercise_external_id: str
    duration: int
    why: str

class PlanSection(BaseModel):
    name: str
    items: List[PlanItem] = []
    minutes: int

class Plan(BaseModel):
    id: str = Field(default_factory=lambda: str(uuid4()))
    template_id: Optional[str] = None
    title: str
    discipline: str
    age_group: str
    target_group: str
    total_minutes: int
    sections: List[PlanSection] = []
    goals: List[str] = []
    capability_summary: Dict[str, int] = {}
    novelty_against_last_n: Optional[float] = None
    fingerprint: Optional[str] = None
    created_by: str
    created_at: datetime = Field(default_factory=lambda: datetime.now(timezone.utc))
    source: str = "API"

class PlanTemplateList(BaseModel):
    items: List[PlanTemplate]
    limit: int
    offset: int
    count: int

class PlanList(BaseModel):
    items: List[Plan]
    limit: int
    offset: int
    count: int

# -----------------
# Helpers
# -----------------
def _ensure_collection(name: str):
    if not qdrant.collection_exists(name):
        qdrant.recreate_collection(
            collection_name=name,
            vectors_config=VectorParams(size=model.get_sentence_embedding_dimension(), distance=Distance.COSINE),
        )

def _norm_list(xs: List[str]) -> List[str]:
    seen, out = set(), []
    for x in xs or []:
        s = str(x).strip()
        k = s.casefold()
        if s and k not in seen:
            seen.add(k)
            out.append(s)
    return sorted(out, key=str.casefold)

def _template_embed_text(tpl: PlanTemplate) -> str:
    par