"""
RAG CLI Commands

Commands:
    sparknet rag index <file>      - Index document for retrieval
    sparknet rag search <query>    - Search indexed documents
    sparknet rag ask <question>    - Answer question using RAG
    sparknet rag status            - Show index status
"""

import typer
from typing import Optional, List
from pathlib import Path
import json
import sys

# Create RAG sub-app
rag_app = typer.Typer(
    name="rag",
    help="RAG and retrieval commands",
)


@rag_app.command("index")
def index_document(
    files: List[Path] = typer.Argument(..., help="Document file(s) to index"),
    collection: str = typer.Option("sparknet_documents", "--collection", "-c", help="Collection name"),
    embedding_model: str = typer.Option("nomic-embed-text", "--model", "-m", help="Embedding model"),
):
    """
    Index document(s) for RAG retrieval.

    Example:
        sparknet rag index document.pdf
        sparknet rag index *.pdf --collection contracts
    """
    from loguru import logger

    # Validate files
    valid_files = []
    for f in files:
        if f.exists():
            valid_files.append(f)
        else:
            typer.echo(f"Warning: File not found, skipping: {f}", err=True)

    if not valid_files:
        typer.echo("Error: No valid files to index", err=True)
        raise typer.Exit(1)

    typer.echo(f"Indexing {len(valid_files)} document(s)...")

    try:
        from ..rag import (
            VectorStoreConfig,
            EmbeddingConfig,
            get_document_indexer,
        )

        # Configure
        store_config = VectorStoreConfig(collection_name=collection)
        embed_config = EmbeddingConfig(ollama_model=embedding_model)

        # Get indexer
        indexer = get_document_indexer()

        # Index documents
        results = indexer.index_batch([str(f) for f in valid_files])

        # Summary
        successful = sum(1 for r in results if r.success)
        total_chunks = sum(r.num_chunks_indexed for r in results)

        typer.echo(f"\nIndexing complete:")
        typer.echo(f"  Documents: {successful}/{len(results)} successful")
        typer.echo(f"  Chunks indexed: {total_chunks}")

        for r in results:
            status = "✓" if r.success else "✗"
            typer.echo(f"  [{status}] {r.source_path}: {r.num_chunks_indexed} chunks")
            if r.error:
                typer.echo(f"      Error: {r.error}")

    except ImportError as e:
        typer.echo(f"Error: Missing dependency - {e}", err=True)
        raise typer.Exit(1)
    except Exception as e:
        typer.echo(f"Error indexing documents: {e}", err=True)
        raise typer.Exit(1)


@rag_app.command("search")
def search_documents(
    query: str = typer.Argument(..., help="Search query"),
    top_k: int = typer.Option(5, "--top", "-k", help="Number of results"),
    collection: str = typer.Option("sparknet_documents", "--collection", "-c", help="Collection name"),
    document_id: Optional[str] = typer.Option(None, "--document", "-d", help="Filter by document ID"),
    chunk_type: Optional[str] = typer.Option(None, "--type", "-t", help="Filter by chunk type"),
    output: Optional[Path] = typer.Option(None, "--output", "-o", help="Output JSON file"),
):
    """
    Search indexed documents.

    Example:
        sparknet rag search "payment terms" --top 10
        sparknet rag search "table data" --type table
    """
    typer.echo(f"Searching: {query}")

    try:
        from ..rag import get_document_retriever, RetrieverConfig

        # Configure
        config = RetrieverConfig(default_top_k=top_k)
        retriever = get_document_retriever(config)

        # Build filters
        filters = {}
        if document_id:
            filters["document_id"] = document_id
        if chunk_type:
            filters["chunk_type"] = chunk_type

        # Search
        chunks = retriever.retrieve(query, top_k=top_k, filters=filters if filters else None)

        if not chunks:
            typer.echo("No results found.")
            return

        # Format output
        output_data = {
            "query": query,
            "num_results": len(chunks),
            "results": [
                {
                    "chunk_id": c.chunk_id,
                    "document_id": c.document_id,
                    "page": c.page,
                    "chunk_type": c.chunk_type,
                    "similarity": c.similarity,
                    "text": c.text[:500] + "..." if len(c.text) > 500 else c.text,
                }
                for c in chunks
            ],
        }

        if output:
            with open(output, "w") as f:
                json.dump(output_data, f, indent=2)
            typer.echo(f"Results written to: {output}")
        else:
            typer.echo(f"\nFound {len(chunks)} results:\n")
            for i, c in enumerate(chunks, 1):
                typer.echo(f"[{i}] Similarity: {c.similarity:.3f}")
                if c.page is not None:
                    typer.echo(f"    Page: {c.page + 1}, Type: {c.chunk_type or 'text'}")
                typer.echo(f"    {c.text[:200]}...")
                typer.echo()

    except Exception as e:
        typer.echo(f"Error searching: {e}", err=True)
        raise typer.Exit(1)


@rag_app.command("ask")
def ask_question(
    question: str = typer.Argument(..., help="Question to answer"),
    top_k: int = typer.Option(5, "--top", "-k", help="Number of context chunks"),
    collection: str = typer.Option("sparknet_documents", "--collection", "-c", help="Collection name"),
    document_id: Optional[str] = typer.Option(None, "--document", "-d", help="Filter by document ID"),
    output: Optional[Path] = typer.Option(None, "--output", "-o", help="Output JSON file"),
    show_evidence: bool = typer.Option(True, "--evidence/--no-evidence", help="Show evidence sources"),
):
    """
    Answer a question using RAG.

    Example:
        sparknet rag ask "What are the payment terms?"
        sparknet rag ask "What is the contract value?" --document contract123
    """
    typer.echo(f"Question: {question}")
    typer.echo("Processing...")

    try:
        from ..rag import get_grounded_generator, GeneratorConfig

        # Configure
        config = GeneratorConfig()
        generator = get_grounded_generator(config)

        # Build filters
        filters = {"document_id": document_id} if document_id else None

        # Generate answer
        result = generator.answer_question(question, top_k=top_k, filters=filters)

        # Format output
        output_data = {
            "question": question,
            "answer": result.answer,
            "confidence": result.confidence,
            "abstained": result.abstained,
            "abstain_reason": result.abstain_reason,
            "citations": [
                {
                    "index": c.index,
                    "page": c.page,
                    "snippet": c.text_snippet,
                    "confidence": c.confidence,
                }
                for c in result.citations
            ],
            "num_chunks_used": result.num_chunks_used,
        }

        if output:
            with open(output, "w") as f:
                json.dump(output_data, f, indent=2)
            typer.echo(f"Results written to: {output}")
        else:
            typer.echo(f"\nAnswer: {result.answer}")
            typer.echo(f"\nConfidence: {result.confidence:.2f}")

            if result.abstained:
                typer.echo(f"Note: {result.abstain_reason}")

            if show_evidence and result.citations:
                typer.echo(f"\nSources ({len(result.citations)}):")
                for c in result.citations:
                    page_info = f"Page {c.page + 1}" if c.page is not None else ""
                    typer.echo(f"  [{c.index}] {page_info}: {c.text_snippet[:80]}...")

    except Exception as e:
        typer.echo(f"Error generating answer: {e}", err=True)
        raise typer.Exit(1)


@rag_app.command("status")
def show_status(
    collection: str = typer.Option("sparknet_documents", "--collection", "-c", help="Collection name"),
):
    """
    Show RAG index status.

    Example:
        sparknet rag status
        sparknet rag status --collection contracts
    """
    typer.echo("RAG Index Status")
    typer.echo("=" * 40)

    try:
        from ..rag import get_vector_store, VectorStoreConfig

        config = VectorStoreConfig(collection_name=collection)
        store = get_vector_store(config)

        # Get stats
        total_chunks = store.count()

        typer.echo(f"Collection: {collection}")
        typer.echo(f"Total chunks: {total_chunks}")

        # List documents
        if hasattr(store, 'list_documents'):
            doc_ids = store.list_documents()
            typer.echo(f"Documents indexed: {len(doc_ids)}")

            if doc_ids:
                typer.echo("\nDocuments:")
                for doc_id in doc_ids[:10]:
                    chunk_count = store.count(doc_id)
                    typer.echo(f"  - {doc_id}: {chunk_count} chunks")

                if len(doc_ids) > 10:
                    typer.echo(f"  ... and {len(doc_ids) - 10} more")

    except Exception as e:
        typer.echo(f"Error getting status: {e}", err=True)
        raise typer.Exit(1)


@rag_app.command("delete")
def delete_document(
    document_id: str = typer.Argument(..., help="Document ID to delete"),
    collection: str = typer.Option("sparknet_documents", "--collection", "-c", help="Collection name"),
    force: bool = typer.Option(False, "--force", "-f", help="Skip confirmation"),
):
    """
    Delete a document from the index.

    Example:
        sparknet rag delete doc123
        sparknet rag delete doc123 --force
    """
    if not force:
        confirm = typer.confirm(f"Delete document '{document_id}' from index?")
        if not confirm:
            typer.echo("Cancelled.")
            return

    try:
        from ..rag import get_vector_store, VectorStoreConfig

        config = VectorStoreConfig(collection_name=collection)
        store = get_vector_store(config)

        deleted = store.delete_document(document_id)
        typer.echo(f"Deleted {deleted} chunks for document: {document_id}")

    except Exception as e:
        typer.echo(f"Error deleting document: {e}", err=True)
        raise typer.Exit(1)