import sys
import os
import json
import logging
from pathlib import Path
from typing import List
from dotenv import load_dotenv

from langchain_core.documents import Document
from langchain_text_splitters import RecursiveCharacterTextSplitter
from langchain_community.document_loaders import NotionDBLoader
from langchain_chroma import Chroma
from langchain_community.vectorstores.utils import filter_complex_metadata
from langchain_core.prompts import ChatPromptTemplate

# Add src to path
sys.path.append(str(Path(__file__).parent.parent / "src"))

from core.settings import settings
from core.llm import get_model
from core.embeddings import get_embeddings

load_dotenv()

# Config
PORTFOLIO_OWNER = os.getenv("PORTFOLIO_OWNER")
NOTION_TOKEN = os.getenv("NOTION_TOKEN")

CHROMA_PERSIST_DIR = "./chroma_db"
CHROMA_COLLECTION = "portfolio"

DB_ENV_MAP = {
    "education": "NOTION_EDUCATION_ID",
    "experience": "NOTION_EXPERIENCE_ID",
    "projects": "NOTION_PROJECT_ID",
    "testimonials": "NOTION_TESTIMONIAL_ID",
    "blog": "NOTION_BLOG_ID",
}

logging.basicConfig(level=logging.INFO, format="%(asctime)s | %(levelname)s | %(message)s")
logger = logging.getLogger(__name__)

# MODELS
LLM = get_model(settings.DEFAULT_MODEL)
EMBEDDINGS = get_embeddings(settings.DEFAULT_EMBEDDING_MODEL)

# PROMPTS
SYSTEM_PROMPT = """
You are a portfolio knowledge-base curator.
All content is about {owner} and written in third person.
The output is stored in a vector database.

Task:
Format the provided input into a clean, concise Markdown entry.

Rules:
- Output valid Markdown only
- Start with an H2 or H3 title
- Use short, factual bullet points
- Write ONLY what is explicitly present in the input
- Preserve original wording exactly
- Do NOT infer, normalize, summarize, interpret, or embellish
- Do NOT add, remove, rename, or assume any fields
- If something is not explicitly stated, do not include it

Formatting:
- Present the information clearly and concisely
- Do not introduce structure beyond what the input supports
- Do not guess labels or categories

Images:
- Render image immediately after the title if a valid image URL exists in metadata

Metadata:
- Always include a final "Metadata" section
- Include all provided metadata exactly as given
"""

DB_STRATEGY_PROMPTS = {
    "education": """
Required fields (must be present if available):
- Education level
- Course or board name
- Institution and location
- Start and end year or completion year
- 1–2 factual achievements or distinctions explicitly stated in the input
""",
    "experience": """
Required fields (must be present if available):
- Role
- Organization
- Location
- Duration
- Up to 3 responsibilities or contributions explicitly stated in the input
""",
    "projects": """
Required fields (must be present if available):
- Project name
- Objective or problem statement
- Up to 3 explicitly stated technologies, features, or outcomes
""",
    "testimonials": """
Required fields (must be present if available):
- Author
- Context
- Verbatim feedback lines from the input (no paraphrasing)
""",
    "blog": """
Required fields (must be present if available):
- Blog title
- Description
- Explicitly listed topics, tags, or technologies
""",
}

ENRICH_PROMPT = ChatPromptTemplate.from_messages(
    [
        ("system", SYSTEM_PROMPT),
        (
            "human",
            """
Owner: {owner}
Source: {source_db}

Strategy:
{strategy}

Raw Input:
{payload}

Task:
Extract one structured Markdown entry.
"""
        ),
    ]
)

# ENRICHMENT
def enrich_and_normalize(docs: List[Document], source_db: str) -> List[Document]:
    strategy = DB_STRATEGY_PROMPTS[source_db]
    processed_docs = []

    for idx, doc in enumerate(docs, start=1):
        logger.info(f"Enriching [{source_db}] document {idx}/{len(docs)}")
        print(f"Enriching [{source_db}] document {idx}/{len(docs)}")

        payload = {
            "content": doc.page_content,
            "metadata": doc.metadata,
        }

        try:
            response = LLM.invoke(
                ENRICH_PROMPT.format_messages(
                    owner=PORTFOLIO_OWNER,
                    source_db=source_db,
                    strategy=strategy,
                    payload=json.dumps(payload, indent=2, default=str),
                )
            )
            markdown = response.content.strip()
            logger.info(f"[CONTENT]: {markdown}")
            print(f"[CONTENT]: {markdown}")

        except Exception as e:
            logger.error(f"LLM failure: {e}")
            print(f"LLM failure: {e}")
            markdown = (
                "## Raw Record\n\n"
                "```json\n"
                f"{json.dumps(payload, indent=2, default=str)}\n"
                "```"
            )

        processed_docs.append(
            Document(
                page_content=markdown,
                metadata=doc.metadata or {},
            )
        )

    return processed_docs

# INGESTION
def run_ingestion():
    if not NOTION_TOKEN:
        logger.error("NOTION_TOKEN is missing.")
        print("NOTION_TOKEN is missing.")
        return

    splitter = RecursiveCharacterTextSplitter(
        chunk_size=900,
        chunk_overlap=100,
    )

    all_chunks = []

    for db_name, env_key in DB_ENV_MAP.items():
        db_id = os.getenv(env_key)
        if not db_id:
            continue

        logger.info(f"Loading {db_name} from Notion")
        print(f"Loading {db_name} from Notion")

        loader = NotionDBLoader(
            integration_token=NOTION_TOKEN,
            database_id=db_id,
        )

        raw_docs = loader.load()
        if not raw_docs:
            logger.warning(f"No records found for {db_name}")
            print(f"No records found for {db_name}")
            continue

        enriched = enrich_and_normalize(raw_docs, db_name)
        chunks = splitter.split_documents(enriched)
        all_chunks.extend(chunks)

    if not all_chunks:
        logger.error("No documents to ingest.")
        print("No documents to ingest.")
        return

    safe_docs = filter_complex_metadata(all_chunks)

    Chroma.from_documents(
        documents=safe_docs,
        embedding=EMBEDDINGS,
        persist_directory=CHROMA_PERSIST_DIR,
        collection_name=CHROMA_COLLECTION,
    )

    logger.info("Ingestion completed successfully.")
    print("Ingestion completed successfully.")

if __name__ == "__main__":
    run_ingestion()