"""
Document Intelligence CLI Commands

CLI interface for the document_intelligence subsystem.
"""

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

import click


@click.group(name="docint")
def docint_cli():
    """Document Intelligence commands."""
    pass


@docint_cli.command()
@click.argument("path", type=click.Path(exists=True))
@click.option("--output", "-o", type=click.Path(), help="Output JSON file")
@click.option("--max-pages", type=int, help="Maximum pages to process")
@click.option("--dpi", type=int, default=200, help="Render DPI (default: 200)")
@click.option("--format", "output_format", type=click.Choice(["json", "markdown", "text"]),
              default="json", help="Output format")
def parse(path: str, output: Optional[str], max_pages: Optional[int],
          dpi: int, output_format: str):
    """
    Parse a document into semantic chunks.

    Example:
        sparknet docint parse invoice.pdf -o result.json
        sparknet docint parse document.pdf --format markdown
    """
    from src.document_intelligence import (
        DocumentParser,
        ParserConfig,
    )

    config = ParserConfig(
        render_dpi=dpi,
        max_pages=max_pages,
    )

    parser = DocumentParser(config=config)

    click.echo(f"Parsing: {path}")

    try:
        result = parser.parse(path)

        if output_format == "json":
            output_data = {
                "doc_id": result.doc_id,
                "filename": result.filename,
                "num_pages": result.num_pages,
                "chunks": [
                    {
                        "chunk_id": c.chunk_id,
                        "type": c.chunk_type.value,
                        "text": c.text,
                        "page": c.page,
                        "bbox": c.bbox.xyxy,
                        "confidence": c.confidence,
                    }
                    for c in result.chunks
                ],
                "processing_time_ms": result.processing_time_ms,
            }

            if output:
                with open(output, "w") as f:
                    json.dump(output_data, f, indent=2)
                click.echo(f"Output written to: {output}")
            else:
                click.echo(json.dumps(output_data, indent=2))

        elif output_format == "markdown":
            if output:
                with open(output, "w") as f:
                    f.write(result.markdown_full)
                click.echo(f"Markdown written to: {output}")
            else:
                click.echo(result.markdown_full)

        else:  # text
            for chunk in result.chunks:
                click.echo(f"[Page {chunk.page}, {chunk.chunk_type.value}]")
                click.echo(chunk.text)
                click.echo()

        click.echo(f"\nParsed {len(result.chunks)} chunks in {result.processing_time_ms:.0f}ms")

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command()
@click.argument("path", type=click.Path(exists=True))
@click.option("--field", "-f", multiple=True, help="Field to extract (can specify multiple)")
@click.option("--schema", "-s", type=click.Path(exists=True), help="JSON schema file")
@click.option("--preset", type=click.Choice(["invoice", "receipt", "contract"]),
              help="Use preset schema")
@click.option("--output", "-o", type=click.Path(), help="Output JSON file")
def extract(path: str, field: tuple, schema: Optional[str], preset: Optional[str],
            output: Optional[str]):
    """
    Extract fields from a document.

    Example:
        sparknet docint extract invoice.pdf --preset invoice
        sparknet docint extract doc.pdf -f vendor_name -f total_amount
        sparknet docint extract doc.pdf --schema my_schema.json
    """
    from src.document_intelligence import (
        DocumentParser,
        FieldExtractor,
        ExtractionSchema,
        FieldSpec,
        FieldType,
        create_invoice_schema,
        create_receipt_schema,
        create_contract_schema,
    )

    # Build schema
    if preset:
        if preset == "invoice":
            extraction_schema = create_invoice_schema()
        elif preset == "receipt":
            extraction_schema = create_receipt_schema()
        elif preset == "contract":
            extraction_schema = create_contract_schema()
    elif schema:
        with open(schema) as f:
            schema_dict = json.load(f)
        extraction_schema = ExtractionSchema.from_json_schema(schema_dict)
    elif field:
        extraction_schema = ExtractionSchema(name="custom")
        for f in field:
            extraction_schema.add_string_field(f, required=True)
    else:
        click.echo("Error: Specify --field, --schema, or --preset", err=True)
        sys.exit(1)

    click.echo(f"Extracting from: {path}")
    click.echo(f"Fields: {', '.join(f.name for f in extraction_schema.fields)}")

    try:
        # Parse document
        parser = DocumentParser()
        parse_result = parser.parse(path)

        # Extract fields
        extractor = FieldExtractor()
        result = extractor.extract(parse_result, extraction_schema)

        output_data = {
            "doc_id": parse_result.doc_id,
            "filename": parse_result.filename,
            "extracted_data": result.data,
            "confidence": result.overall_confidence,
            "abstained_fields": result.abstained_fields,
            "evidence": [
                {
                    "chunk_id": e.chunk_id,
                    "page": e.page,
                    "bbox": e.bbox.xyxy,
                    "snippet": e.snippet,
                }
                for e in result.evidence
            ],
        }

        if output:
            with open(output, "w") as f:
                json.dump(output_data, f, indent=2)
            click.echo(f"Output written to: {output}")
        else:
            click.echo("\nExtracted Data:")
            for key, value in result.data.items():
                status = "" if key not in result.abstained_fields else " [ABSTAINED]"
                click.echo(f"  {key}: {value}{status}")

            click.echo(f"\nConfidence: {result.overall_confidence:.2f}")

            if result.abstained_fields:
                click.echo(f"Abstained: {', '.join(result.abstained_fields)}")

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command()
@click.argument("path", type=click.Path(exists=True))
@click.argument("question")
@click.option("--verbose", "-v", is_flag=True, help="Show evidence details")
@click.option("--use-rag", is_flag=True, help="Use RAG for retrieval (requires indexed document)")
@click.option("--document-id", "-d", help="Document ID for RAG retrieval")
@click.option("--top-k", "-k", type=int, default=5, help="Number of chunks to consider")
@click.option("--chunk-type", "-t", multiple=True, help="Filter by chunk type (can specify multiple)")
@click.option("--page-start", type=int, help="Filter by page range start")
@click.option("--page-end", type=int, help="Filter by page range end")
def ask(path: str, question: str, verbose: bool, use_rag: bool,
        document_id: Optional[str], top_k: int, chunk_type: tuple,
        page_start: Optional[int], page_end: Optional[int]):
    """
    Ask a question about a document.

    Example:
        sparknet docint ask invoice.pdf "What is the total amount?"
        sparknet docint ask doc.pdf "Find claims" --use-rag --top-k 10
        sparknet docint ask doc.pdf "What tables show?" -t table --use-rag
    """
    from src.document_intelligence import DocumentParser

    click.echo(f"Document: {path}")
    click.echo(f"Question: {question}")

    if use_rag:
        click.echo("Mode: RAG (semantic retrieval)")
    else:
        click.echo("Mode: Keyword search")

    click.echo()

    try:
        if use_rag:
            # Use RAG-based answering
            from src.document_intelligence.tools import get_rag_tool

            tool = get_rag_tool("rag_answer")

            # Build page range if specified
            page_range = None
            if page_start is not None and page_end is not None:
                page_range = (page_start, page_end)

            result = tool.execute(
                question=question,
                document_id=document_id,
                top_k=top_k,
                chunk_types=list(chunk_type) if chunk_type else None,
                page_range=page_range,
            )
        else:
            # Parse document and use keyword-based search
            from src.document_intelligence.tools import get_tool

            parser = DocumentParser()
            parse_result = parser.parse(path)

            tool = get_tool("answer_question")
            result = tool.execute(
                parse_result=parse_result,
                question=question,
                top_k=top_k,
            )

        if result.success:
            data = result.data
            click.echo(f"Answer: {data.get('answer', 'No answer found')}")
            click.echo(f"Confidence: {data.get('confidence', 0):.2f}")

            if data.get('abstained'):
                click.echo("Note: The system abstained due to low confidence.")

            if verbose and result.evidence:
                click.echo("\nEvidence:")
                for ev in result.evidence:
                    click.echo(f"  - Page {ev.get('page', '?')}: {ev.get('snippet', '')[:100]}...")

            if data.get('citations'):
                click.echo("\nCitations:")
                for cit in data['citations']:
                    click.echo(f"  [{cit['index']}] {cit.get('text', '')[:80]}...")
        else:
            click.echo(f"Error: {result.error}", err=True)

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command()
@click.argument("path", type=click.Path(exists=True))
@click.option("--output", "-o", type=click.Path(), help="Output JSON file")
def classify(path: str, output: Optional[str]):
    """
    Classify a document's type.

    Example:
        sparknet docint classify document.pdf
    """
    from src.document_intelligence import DocumentParser
    from src.document_intelligence.chunks import DocumentType

    click.echo(f"Classifying: {path}")

    try:
        # Parse document
        parser = DocumentParser()
        parse_result = parser.parse(path)

        # Simple classification based on keywords
        first_page_chunks = [c for c in parse_result.chunks if c.page == 1][:5]
        content = " ".join(c.text[:200] for c in first_page_chunks).lower()

        doc_type = "other"
        confidence = 0.5

        type_keywords = {
            "invoice": ["invoice", "bill", "payment due", "amount due", "invoice number"],
            "contract": ["agreement", "contract", "party", "whereas", "terms and conditions"],
            "receipt": ["receipt", "paid", "transaction", "thank you for your purchase"],
            "form": ["form", "fill in", "checkbox", "signature line"],
            "letter": ["dear", "sincerely", "regards", "to whom it may concern"],
            "report": ["report", "findings", "conclusion", "summary", "analysis"],
            "patent": ["patent", "claims", "invention", "embodiment", "disclosed"],
        }

        for dtype, keywords in type_keywords.items():
            matches = sum(1 for k in keywords if k in content)
            if matches >= 2:
                doc_type = dtype
                confidence = min(0.95, 0.5 + matches * 0.15)
                break

        output_data = {
            "doc_id": parse_result.doc_id,
            "filename": parse_result.filename,
            "document_type": doc_type,
            "confidence": confidence,
        }

        if output:
            with open(output, "w") as f:
                json.dump(output_data, f, indent=2)
            click.echo(f"Output written to: {output}")
        else:
            click.echo(f"Type: {doc_type}")
            click.echo(f"Confidence: {confidence:.2f}")

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command()
@click.argument("path", type=click.Path(exists=True))
@click.option("--query", "-q", help="Search query")
@click.option("--type", "chunk_type", help="Filter by chunk type")
@click.option("--top", "-k", type=int, default=10, help="Number of results")
def search(path: str, query: Optional[str], chunk_type: Optional[str], top: int):
    """
    Search document content.

    Example:
        sparknet docint search document.pdf -q "payment terms"
        sparknet docint search document.pdf --type table
    """
    from src.document_intelligence import DocumentParser
    from src.document_intelligence.tools import get_tool

    click.echo(f"Searching: {path}")

    try:
        # Parse document
        parser = DocumentParser()
        parse_result = parser.parse(path)

        if query:
            # Search by query
            tool = get_tool("search_chunks")
            result = tool.execute(
                parse_result=parse_result,
                query=query,
                chunk_types=[chunk_type] if chunk_type else None,
                top_k=top,
            )

            if result.success:
                results = result.data.get("results", [])
                click.echo(f"Found {len(results)} results:\n")

                for i, r in enumerate(results, 1):
                    click.echo(f"{i}. [Page {r['page']}, {r['type']}] (score: {r['score']:.2f})")
                    click.echo(f"   {r['text'][:200]}...")
                    click.echo()
            else:
                click.echo(f"Error: {result.error}", err=True)

        elif chunk_type:
            # Filter by type
            matching = [c for c in parse_result.chunks if c.chunk_type.value == chunk_type]
            click.echo(f"Found {len(matching)} {chunk_type} chunks:\n")

            for i, chunk in enumerate(matching[:top], 1):
                click.echo(f"{i}. [Page {chunk.page}] {chunk.chunk_id}")
                click.echo(f"   {chunk.text[:200]}...")
                click.echo()

        else:
            # List all chunks
            click.echo(f"Total chunks: {len(parse_result.chunks)}\n")

            # Group by type
            by_type = {}
            for chunk in parse_result.chunks:
                t = chunk.chunk_type.value
                by_type[t] = by_type.get(t, 0) + 1

            click.echo("Chunk types:")
            for t, count in sorted(by_type.items()):
                click.echo(f"  {t}: {count}")

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command()
@click.argument("path", type=click.Path(exists=True))
@click.option("--page", "-p", type=int, default=1, help="Page number")
@click.option("--output-dir", "-d", type=click.Path(), default="./crops",
              help="Output directory for crops")
@click.option("--annotate", "-a", is_flag=True, help="Create annotated page image")
def visualize(path: str, page: int, output_dir: str, annotate: bool):
    """
    Visualize document regions.

    Example:
        sparknet docint visualize document.pdf --page 1 --annotate
    """
    from src.document_intelligence import (
        DocumentParser,
        load_document,
        RenderOptions,
    )
    from src.document_intelligence.grounding import create_annotated_image, CropManager
    from PIL import Image
    import numpy as np

    output_path = Path(output_dir)
    output_path.mkdir(parents=True, exist_ok=True)

    click.echo(f"Processing: {path}, page {page}")

    try:
        # Parse document
        parser = DocumentParser()
        parse_result = parser.parse(path)

        # Load and render page
        loader, renderer = load_document(path)
        page_image = renderer.render_page(page, RenderOptions(dpi=200))
        loader.close()

        # Get page chunks
        page_chunks = [c for c in parse_result.chunks if c.page == page]

        if annotate:
            # Create annotated image
            bboxes = [c.bbox for c in page_chunks]
            labels = [f"{c.chunk_type.value[:10]}" for c in page_chunks]

            annotated = create_annotated_image(page_image, bboxes, labels)

            output_file = output_path / f"annotated_page_{page}.png"
            Image.fromarray(annotated).save(output_file)
            click.echo(f"Saved annotated image: {output_file}")

        else:
            # Save individual crops
            crop_manager = CropManager(output_path)

            for chunk in page_chunks:
                crop_path = crop_manager.save_crop(
                    page_image,
                    parse_result.doc_id,
                    page,
                    chunk.bbox,
                )
                click.echo(f"Saved crop: {crop_path}")

        click.echo(f"\nProcessed {len(page_chunks)} chunks from page {page}")

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command()
@click.argument("paths", nargs=-1, type=click.Path(exists=True), required=True)
@click.option("--max-pages", type=int, help="Maximum pages to process per document")
@click.option("--batch-size", type=int, default=32, help="Embedding batch size")
@click.option("--min-length", type=int, default=10, help="Minimum chunk text length")
def index(paths: tuple, max_pages: Optional[int], batch_size: int, min_length: int):
    """
    Index documents into the vector store for RAG.

    Example:
        sparknet docint index document.pdf
        sparknet docint index *.pdf --max-pages 50
        sparknet docint index doc1.pdf doc2.pdf doc3.pdf
    """
    from src.document_intelligence.tools import get_rag_tool

    click.echo(f"Indexing {len(paths)} document(s)...")
    click.echo()

    try:
        tool = get_rag_tool("index_document")

        total_indexed = 0
        total_skipped = 0
        errors = []

        for path in paths:
            click.echo(f"Processing: {path}")

            result = tool.execute(
                path=path,
                max_pages=max_pages,
            )

            if result.success:
                data = result.data
                indexed = data.get("chunks_indexed", 0)
                skipped = data.get("chunks_skipped", 0)
                total_indexed += indexed
                total_skipped += skipped
                click.echo(f"  Indexed: {indexed} chunks, Skipped: {skipped}")
                click.echo(f"  Document ID: {data.get('document_id', 'unknown')}")
            else:
                errors.append((path, result.error))
                click.echo(f"  Error: {result.error}", err=True)

        click.echo()
        click.echo("=" * 40)
        click.echo(f"Total documents: {len(paths)}")
        click.echo(f"Total chunks indexed: {total_indexed}")
        click.echo(f"Total chunks skipped: {total_skipped}")

        if errors:
            click.echo(f"Errors: {len(errors)}")
            for path, err in errors:
                click.echo(f"  - {path}: {err}")

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command(name="index-stats")
def index_stats():
    """
    Show statistics about the vector store index.

    Example:
        sparknet docint index-stats
    """
    from src.document_intelligence.tools import get_rag_tool

    try:
        tool = get_rag_tool("get_index_stats")
        result = tool.execute()

        if result.success:
            data = result.data
            click.echo("Vector Store Statistics:")
            click.echo(f"  Total chunks: {data.get('total_chunks', 0)}")
            click.echo(f"  Embedding model: {data.get('embedding_model', 'unknown')}")
            click.echo(f"  Embedding dimension: {data.get('embedding_dimension', 'unknown')}")
        else:
            click.echo(f"Error: {result.error}", err=True)

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command(name="delete-index")
@click.argument("document_id")
@click.option("--yes", "-y", is_flag=True, help="Skip confirmation prompt")
def delete_index(document_id: str, yes: bool):
    """
    Delete a document from the vector store index.

    Example:
        sparknet docint delete-index doc_abc123
    """
    from src.document_intelligence.tools import get_rag_tool

    if not yes:
        click.confirm(f"Delete document '{document_id}' from index?", abort=True)

    try:
        tool = get_rag_tool("delete_document")
        result = tool.execute(document_id=document_id)

        if result.success:
            data = result.data
            click.echo(f"Deleted {data.get('chunks_deleted', 0)} chunks for document: {document_id}")
        else:
            click.echo(f"Error: {result.error}", err=True)

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


@docint_cli.command(name="retrieve")
@click.argument("query")
@click.option("--top-k", "-k", type=int, default=5, help="Number of results")
@click.option("--document-id", "-d", help="Filter by document ID")
@click.option("--chunk-type", "-t", multiple=True, help="Filter by chunk type")
@click.option("--page-start", type=int, help="Filter by page range start")
@click.option("--page-end", type=int, help="Filter by page range end")
@click.option("--verbose", "-v", is_flag=True, help="Show full chunk text")
def retrieve(query: str, top_k: int, document_id: Optional[str],
             chunk_type: tuple, page_start: Optional[int],
             page_end: Optional[int], verbose: bool):
    """
    Retrieve relevant chunks from the vector store.

    Example:
        sparknet docint retrieve "payment terms"
        sparknet docint retrieve "claims" -d doc_abc123 -t paragraph -k 10
    """
    from src.document_intelligence.tools import get_rag_tool

    click.echo(f"Query: {query}")
    click.echo()

    try:
        tool = get_rag_tool("retrieve_chunks")

        page_range = None
        if page_start is not None and page_end is not None:
            page_range = (page_start, page_end)

        result = tool.execute(
            query=query,
            top_k=top_k,
            document_id=document_id,
            chunk_types=list(chunk_type) if chunk_type else None,
            page_range=page_range,
        )

        if result.success:
            data = result.data
            chunks = data.get("chunks", [])
            click.echo(f"Found {len(chunks)} results:\n")

            for i, chunk in enumerate(chunks, 1):
                click.echo(f"{i}. [sim={chunk['similarity']:.3f}] Page {chunk.get('page', '?')}, {chunk.get('chunk_type', 'text')}")
                click.echo(f"   Document: {chunk['document_id']}")

                text = chunk['text']
                if verbose:
                    click.echo(f"   Text: {text}")
                else:
                    click.echo(f"   Text: {text[:150]}...")
                click.echo()
        else:
            click.echo(f"Error: {result.error}", err=True)

    except Exception as e:
        click.echo(f"Error: {e}", err=True)
        sys.exit(1)


# Register with main CLI
def register_commands(cli):
    """Register docint commands with main CLI."""
    cli.add_command(docint_cli)