"""
Vocab Learn Bridge — Converts vocabulary session data into Learning Units.

Bridges klausur-service (vocab extraction) with backend-lehrer (learning units + generators).
Creates a Learning Unit in backend-lehrer, then triggers MC/Cloze/QA generation.

DATENSCHUTZ: All communication stays within Docker network (breakpilot-network).
"""

import os
import json
import logging
import httpx
from typing import List, Dict, Any, Optional

logger = logging.getLogger(__name__)

BACKEND_LEHRER_URL = os.getenv("BACKEND_LEHRER_URL", "http://backend-lehrer:8001")


def vocab_to_analysis_data(session_name: str, vocabulary: List[Dict[str, Any]]) -> Dict[str, Any]:
    """
    Convert vocabulary entries from a vocab session into the analysis_data format
    expected by backend-lehrer generators (MC, Cloze, QA).

    The generators consume:
    - title: Display name
    - subject: Subject area
    - grade_level: Target grade
    - canonical_text: Full text representation
    - printed_blocks: Individual text blocks
    - vocabulary: Original vocab data (for vocab-specific modules)
    """
    canonical_lines = []
    printed_blocks = []

    for v in vocabulary:
        en = v.get("english", "").strip()
        de = v.get("german", "").strip()
        example = v.get("example_sentence", "").strip()

        if not en and not de:
            continue

        line = f"{en} = {de}"
        if example:
            line += f" ({example})"
        canonical_lines.append(line)

        block_text = f"{en} — {de}"
        if example:
            block_text += f" | {example}"
        printed_blocks.append({"text": block_text})

    return {
        "title": session_name,
        "subject": "English Vocabulary",
        "grade_level": "5-8",
        "canonical_text": "\n".join(canonical_lines),
        "printed_blocks": printed_blocks,
        "vocabulary": vocabulary,
    }


async def create_learning_unit(
    session_name: str,
    vocabulary: List[Dict[str, Any]],
    grade: Optional[str] = None,
) -> Dict[str, Any]:
    """
    Create a Learning Unit in backend-lehrer from vocabulary data.

    Steps:
    1. Create unit via POST /api/learning-units/
    2. Return the created unit info

    Returns dict with unit_id, status, vocabulary_count.
    """
    if not vocabulary:
        raise ValueError("No vocabulary entries provided")

    analysis_data = vocab_to_analysis_data(session_name, vocabulary)

    async with httpx.AsyncClient(timeout=30.0) as client:
        # 1. Create Learning Unit
        create_payload = {
            "title": session_name,
            "subject": "Englisch",
            "grade": grade or "5-8",
        }

        try:
            resp = await client.post(
                f"{BACKEND_LEHRER_URL}/api/learning-units/",
                json=create_payload,
            )
            resp.raise_for_status()
            unit = resp.json()
        except httpx.HTTPError as e:
            logger.error(f"Failed to create learning unit: {e}")
            raise RuntimeError(f"Backend-Lehrer nicht erreichbar: {e}")

        unit_id = unit.get("id")
        if not unit_id:
            raise RuntimeError("Learning Unit created but no ID returned")

        logger.info(f"Created learning unit {unit_id} with {len(vocabulary)} vocabulary entries")

        # 2. Save analysis_data as JSON file for generators
        analysis_dir = os.path.expanduser("~/Arbeitsblaetter/Lerneinheiten")
        os.makedirs(analysis_dir, exist_ok=True)
        analysis_path = os.path.join(analysis_dir, f"{unit_id}_analyse.json")

        with open(analysis_path, "w", encoding="utf-8") as f:
            json.dump(analysis_data, f, ensure_ascii=False, indent=2)

        logger.info(f"Saved analysis data to {analysis_path}")

        return {
            "unit_id": unit_id,
            "unit": unit,
            "analysis_path": analysis_path,
            "vocabulary_count": len(vocabulary),
            "status": "created",
        }


async def generate_learning_modules(
    unit_id: str,
    analysis_path: str,
) -> Dict[str, Any]:
    """
    Trigger MC, Cloze, and QA generation from analysis data.

    Imports generators directly (they run in-process for klausur-service)
    or calls backend-lehrer API if generators aren't available locally.

    Returns dict with generation results.
    """
    results = {
        "unit_id": unit_id,
        "mc": {"status": "pending"},
        "cloze": {"status": "pending"},
        "qa": {"status": "pending"},
    }

    # Load analysis data
    with open(analysis_path, "r", encoding="utf-8") as f:
        analysis_data = json.load(f)

    # Try to generate via backend-lehrer API
    async with httpx.AsyncClient(timeout=120.0) as client:
        # Generate QA (includes Leitner fields)
        try:
            resp = await client.post(
                f"{BACKEND_LEHRER_URL}/api/learning-units/{unit_id}/generate-qa",
                json={"analysis_data": analysis_data, "num_questions": min(len(analysis_data.get("vocabulary", [])), 20)},
            )
            if resp.status_code == 200:
                results["qa"] = {"status": "generated", "data": resp.json()}
            else:
                logger.warning(f"QA generation returned {resp.status_code}")
                results["qa"] = {"status": "skipped", "reason": f"HTTP {resp.status_code}"}
        except Exception as e:
            logger.warning(f"QA generation failed: {e}")
            results["qa"] = {"status": "error", "reason": str(e)}

        # Generate MC
        try:
            resp = await client.post(
                f"{BACKEND_LEHRER_URL}/api/learning-units/{unit_id}/generate-mc",
                json={"analysis_data": analysis_data, "num_questions": min(len(analysis_data.get("vocabulary", [])), 10)},
            )
            if resp.status_code == 200:
                results["mc"] = {"status": "generated", "data": resp.json()}
            else:
                results["mc"] = {"status": "skipped", "reason": f"HTTP {resp.status_code}"}
        except Exception as e:
            logger.warning(f"MC generation failed: {e}")
            results["mc"] = {"status": "error", "reason": str(e)}

        # Generate Cloze
        try:
            resp = await client.post(
                f"{BACKEND_LEHRER_URL}/api/learning-units/{unit_id}/generate-cloze",
                json={"analysis_data": analysis_data},
            )
            if resp.status_code == 200:
                results["cloze"] = {"status": "generated", "data": resp.json()}
            else:
                results["cloze"] = {"status": "skipped", "reason": f"HTTP {resp.status_code}"}
        except Exception as e:
            logger.warning(f"Cloze generation failed: {e}")
            results["cloze"] = {"status": "error", "reason": str(e)}

    return results