"""
Agent Adapter for Document Intelligence

Bridges the DocumentAgent with the new document_intelligence subsystem.
Provides enhanced tools and capabilities.
"""

import logging
from dataclasses import dataclass
from pathlib import Path
from typing import Any, Dict, List, Optional, Tuple, Union

from .chunks.models import (
    DocumentChunk,
    EvidenceRef,
    ParseResult,
    ExtractionResult,
    ClassificationResult,
    DocumentType,
)
from .parsing import DocumentParser, ParserConfig
from .extraction import (
    ExtractionSchema,
    FieldExtractor,
    ExtractionConfig,
    ExtractionValidator,
)
from .grounding import EvidenceBuilder, EvidenceTracker, CropManager
from .tools import get_tool, list_tools, ToolResult

logger = logging.getLogger(__name__)


@dataclass
class AgentConfig:
    """Configuration for the document agent adapter."""

    # Parser settings
    render_dpi: int = 200
    max_pages: Optional[int] = None
    ocr_languages: List[str] = None

    # Extraction settings
    min_confidence: float = 0.5
    abstain_on_low_confidence: bool = True

    # Grounding settings
    enable_crops: bool = True
    crop_output_dir: Optional[Path] = None

    # Agent settings
    max_iterations: int = 10
    verbose: bool = False

    def __post_init__(self):
        if self.ocr_languages is None:
            self.ocr_languages = ["en"]


class DocumentIntelligenceAdapter:
    """
    Adapter connecting DocumentAgent with document_intelligence subsystem.

    Provides:
    - Document loading and parsing
    - Schema-driven extraction
    - Evidence-grounded results
    - Tool execution
    """

    def __init__(
        self,
        config: Optional[AgentConfig] = None,
        llm_client: Optional[Any] = None,
    ):
        self.config = config or AgentConfig()
        self.llm_client = llm_client

        # Initialize components
        self.parser = DocumentParser(
            config=ParserConfig(
                render_dpi=self.config.render_dpi,
                max_pages=self.config.max_pages,
                ocr_languages=self.config.ocr_languages,
            )
        )

        self.extractor = FieldExtractor(
            config=ExtractionConfig(
                min_field_confidence=self.config.min_confidence,
                abstain_on_low_confidence=self.config.abstain_on_low_confidence,
            )
        )

        self.validator = ExtractionValidator(
            min_confidence=self.config.min_confidence,
        )

        self.evidence_builder = EvidenceBuilder()

        if self.config.enable_crops and self.config.crop_output_dir:
            self.crop_manager = CropManager(self.config.crop_output_dir)
        else:
            self.crop_manager = None

        # State
        self._current_parse_result: Optional[ParseResult] = None
        self._page_images: Dict[int, Any] = {}

        logger.info("Initialized DocumentIntelligenceAdapter")

    def load_document(
        self,
        path: Union[str, Path],
        render_pages: bool = True,
    ) -> ParseResult:
        """
        Load and parse a document.

        Args:
            path: Path to document file
            render_pages: Whether to keep rendered page images

        Returns:
            ParseResult with chunks and metadata
        """
        path = Path(path)
        logger.info(f"Loading document: {path}")

        # Parse document
        self._current_parse_result = self.parser.parse(path)

        # Optionally store page images
        if render_pages:
            from .io import load_document, RenderOptions
            loader, renderer = load_document(path)
            for page_num in range(1, self._current_parse_result.num_pages + 1):
                self._page_images[page_num] = renderer.render_page(
                    page_num,
                    RenderOptions(dpi=self.config.render_dpi)
                )
            loader.close()

        return self._current_parse_result

    def extract_fields(
        self,
        schema: Union[ExtractionSchema, Dict[str, Any]],
        validate: bool = True,
    ) -> ExtractionResult:
        """
        Extract fields from the loaded document.

        Args:
            schema: Extraction schema
            validate: Whether to validate results

        Returns:
            ExtractionResult with values and evidence
        """
        if not self._current_parse_result:
            raise RuntimeError("No document loaded. Call load_document() first.")

        # Convert dict schema if needed
        if isinstance(schema, dict):
            schema = ExtractionSchema.from_json_schema(schema)

        # Extract
        result = self.extractor.extract(self._current_parse_result, schema)

        # Validate if requested
        if validate:
            validation = self.validator.validate(result, schema)
            if not validation.is_valid:
                logger.warning(f"Extraction validation failed: {validation.error_count} errors")
                # Add validation issues to result
                result.metadata = result.metadata or {}
                result.metadata["validation_issues"] = [
                    {"field": i.field_name, "type": i.issue_type, "message": i.message}
                    for i in validation.issues
                ]

        return result

    def answer_question(
        self,
        question: str,
        use_llm: bool = True,
    ) -> Tuple[str, List[EvidenceRef], float]:
        """
        Answer a question about the document.

        Args:
            question: Question to answer
            use_llm: Whether to use LLM for generation

        Returns:
            Tuple of (answer, evidence, confidence)
        """
        if not self._current_parse_result:
            raise RuntimeError("No document loaded")

        tool = get_tool("answer_question", llm_client=self.llm_client)
        result = tool.execute(
            parse_result=self._current_parse_result,
            question=question,
            use_rag=False,
        )

        if not result.success:
            return f"Error: {result.error}", [], 0.0

        data = result.data
        answer = data.get("answer", "")
        confidence = data.get("confidence", 0.5)

        # Convert evidence
        evidence = []
        for ev_dict in result.evidence:
            from .chunks.models import BoundingBox
            evidence.append(EvidenceRef(
                chunk_id=ev_dict["chunk_id"],
                doc_id=self._current_parse_result.doc_id,
                page=ev_dict["page"],
                bbox=BoundingBox(
                    x_min=ev_dict["bbox"][0],
                    y_min=ev_dict["bbox"][1],
                    x_max=ev_dict["bbox"][2],
                    y_max=ev_dict["bbox"][3],
                    normalized=True,
                ),
                source_type="text",
                snippet=ev_dict.get("snippet", ""),
                confidence=confidence,
            ))

        return answer, evidence, confidence

    def search_chunks(
        self,
        query: str,
        chunk_types: Optional[List[str]] = None,
        top_k: int = 10,
    ) -> List[Dict[str, Any]]:
        """
        Search for chunks matching a query.

        Args:
            query: Search query
            chunk_types: Optional chunk type filter
            top_k: Maximum results

        Returns:
            List of matching chunks with scores
        """
        if not self._current_parse_result:
            raise RuntimeError("No document loaded")

        tool = get_tool("search_chunks")
        result = tool.execute(
            parse_result=self._current_parse_result,
            query=query,
            chunk_types=chunk_types,
            top_k=top_k,
        )

        if not result.success:
            return []

        return result.data.get("results", [])

    def get_chunk(self, chunk_id: str) -> Optional[DocumentChunk]:
        """Get a chunk by ID."""
        if not self._current_parse_result:
            return None

        for chunk in self._current_parse_result.chunks:
            if chunk.chunk_id == chunk_id:
                return chunk
        return None

    def get_page_image(self, page: int) -> Optional[Any]:
        """Get rendered page image."""
        return self._page_images.get(page)

    def crop_chunk(
        self,
        chunk: DocumentChunk,
        padding_percent: float = 0.02,
    ) -> Optional[Any]:
        """Crop the region of a chunk from its page."""
        page_image = self.get_page_image(chunk.page)
        if page_image is None:
            return None

        from .grounding import crop_region
        return crop_region(page_image, chunk.bbox, padding_percent)

    def get_tools_description(self) -> str:
        """Get description of available tools for agent prompts."""
        tools = list_tools()
        lines = []
        for tool in tools:
            lines.append(f"- {tool['name']}: {tool['description']}")
        return "\n".join(lines)

    def execute_tool(
        self,
        tool_name: str,
        **kwargs
    ) -> ToolResult:
        """
        Execute a document tool.

        Args:
            tool_name: Name of tool to execute
            **kwargs: Tool arguments

        Returns:
            ToolResult
        """
        # Add current parse result if not provided
        if "parse_result" not in kwargs and self._current_parse_result:
            kwargs["parse_result"] = self._current_parse_result

        tool = get_tool(tool_name, llm_client=self.llm_client)
        return tool.execute(**kwargs)

    @property
    def parse_result(self) -> Optional[ParseResult]:
        """Get current parse result."""
        return self._current_parse_result

    @property
    def document_id(self) -> Optional[str]:
        """Get current document ID."""
        if self._current_parse_result:
            return self._current_parse_result.doc_id
        return None


def create_enhanced_document_agent(
    llm_client: Any,
    config: Optional[AgentConfig] = None,
) -> "EnhancedDocumentAgent":
    """
    Create an enhanced DocumentAgent with document_intelligence integration.

    Args:
        llm_client: LLM client for reasoning
        config: Agent configuration

    Returns:
        EnhancedDocumentAgent instance
    """
    return EnhancedDocumentAgent(llm_client=llm_client, config=config)


class EnhancedDocumentAgent:
    """
    Enhanced DocumentAgent using document_intelligence subsystem.

    Extends the ReAct-style agent with:
    - Better parsing and chunking
    - Schema-driven extraction
    - Visual grounding
    - Evidence tracking
    """

    def __init__(
        self,
        llm_client: Any,
        config: Optional[AgentConfig] = None,
    ):
        self.adapter = DocumentIntelligenceAdapter(
            config=config,
            llm_client=llm_client,
        )
        self.llm_client = llm_client
        self.config = config or AgentConfig()

    async def load_document(self, path: Union[str, Path]) -> ParseResult:
        """Load a document for processing."""
        return self.adapter.load_document(path, render_pages=True)

    async def extract_fields(
        self,
        schema: Union[ExtractionSchema, Dict],
    ) -> ExtractionResult:
        """Extract fields using schema."""
        return self.adapter.extract_fields(schema, validate=True)

    async def answer_question(
        self,
        question: str,
    ) -> Tuple[str, List[EvidenceRef]]:
        """Answer a question about the document."""
        answer, evidence, confidence = self.adapter.answer_question(question)
        return answer, evidence

    async def classify(self) -> ClassificationResult:
        """Classify the document type."""
        if not self.adapter.parse_result:
            raise RuntimeError("No document loaded")

        # Get first page content
        first_page_chunks = [
            c for c in self.adapter.parse_result.chunks
            if c.page == 1
        ][:5]

        content = " ".join(c.text[:200] for c in first_page_chunks)

        # Simple keyword-based classification
        doc_type = DocumentType.OTHER
        confidence = 0.5

        type_keywords = {
            DocumentType.INVOICE: ["invoice", "bill", "payment due", "amount due"],
            DocumentType.CONTRACT: ["agreement", "contract", "party", "whereas"],
            DocumentType.RECEIPT: ["receipt", "paid", "transaction", "thank you"],
            DocumentType.FORM: ["form", "fill in", "checkbox", "signature line"],
            DocumentType.LETTER: ["dear", "sincerely", "regards"],
            DocumentType.REPORT: ["report", "findings", "conclusion", "summary"],
            DocumentType.PATENT: ["patent", "claims", "invention", "embodiment"],
        }

        content_lower = content.lower()
        for dtype, keywords in type_keywords.items():
            matches = sum(1 for k in keywords if k in content_lower)
            if matches > 0:
                doc_type = dtype
                confidence = min(0.9, 0.5 + matches * 0.15)
                break

        return ClassificationResult(
            doc_id=self.adapter.document_id,
            document_type=doc_type,
            confidence=confidence,
            secondary_types=[],
        )

    def search(
        self,
        query: str,
        top_k: int = 10,
    ) -> List[Dict[str, Any]]:
        """Search document content."""
        return self.adapter.search_chunks(query, top_k=top_k)

    @property
    def current_document(self) -> Optional[ParseResult]:
        """Get current document."""
        return self.adapter.parse_result