# services/master_tools.py
from typing import Optional, Dict, Any, List
from pydantic import BaseModel, Field, model_validator
from langchain_core.tools import tool
import os

# Import your remote utilities
from utilities.extract_text import extract_text_remote
from utilities.extract_tables import extract_tables_remote
from utilities.describe_images import describe_images_remote
from utilities.summarizer import summarize_remote
from utilities.classify import classify_remote
from utilities.ner import ner_remote
from utilities.translator import translate_remote
from utilities.signature_verification import signature_verification_remote
from utilities.stamp_detection import stamp_detection_remote


# ---------- Agent Integration (Phase 1) ----------

def _use_agents() -> bool:
    """Check if agent mode is enabled via USE_AGENTS environment variable."""
    return os.getenv("USE_AGENTS", "false").lower() == "true"

def _get_agent_if_enabled(agent_name: str):
    """Get agent from registry if USE_AGENTS=true, otherwise return None."""
    if not _use_agents():
        return None
    
    try:
        from services.agents.agent_registry import get_agent
        return get_agent(agent_name)
    except Exception as e:
        # If agent system fails, fall back to utilities silently
        print(f"Warning: Agent system unavailable ({e}), using utility fallback")
        return None


# ---------- Shared helpers ----------

def _base_state(file_path: str, start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Build the base state your utilities expect.
    """
    filename = os.path.basename(file_path)
    return {
        "filename": filename,
        "temp_files": {filename: file_path},
        "start_page": start_page,
        "end_page": end_page,
    }


# ---------- Arg Schemas ----------

class FileSpanArgs(BaseModel):
    file_path: str = Field(..., description="Absolute/local path to the uploaded file")
    start_page: int = Field(1, description="Start page (1-indexed)", ge=1)
    end_page: int = Field(1, description="End page (inclusive, 1-indexed)", ge=1)

class TextOrFileArgs(BaseModel):
    text: Optional[str] = Field(None, description="Raw text to process")
    file_path: Optional[str] = Field(None, description="Path to a document on disk (PDF/Image)")
    start_page: int = Field(1, description="Start page (1-indexed)", ge=1)
    end_page: int = Field(1, description="End page (inclusive, 1-indexed)", ge=1)

    @model_validator(mode="after")
    def validate_sources(self):
        if not self.text and not self.file_path:
            raise ValueError("Provide either text or file_path.")
        return self

class TranslateArgs(TextOrFileArgs):
    target_lang: str = Field(..., description="Target language code or name (e.g., 'es' or 'Spanish')")

class FinalizeArgs(BaseModel):
    content: Dict[str, Any] = Field(..., description="JSON payload to return directly to the user")


# ---------- Tools ----------

@tool("extract_text", args_schema=FileSpanArgs)
def extract_text_tool(file_path: str, start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Extract text from a document between start_page and end_page (inclusive).
    Use this when the user asks to read, analyze, or summarize document text.
    Returns: {"text": "..."}
    """
    # Try agent path if enabled
    agent = _get_agent_if_enabled("extract_text")
    if agent:
        state = _base_state(file_path, start_page, end_page)
        result = agent.run(state)
        # Extract text field for compatibility
        text = result.get("text") or result.get("extracted_text") or ""
        return {"text": text}
    
    # Fallback to utility
    state = _base_state(file_path, start_page, end_page)
    out = extract_text_remote(state)
    text = out.get("text") or out.get("extracted_text") or ""
    return {"text": text}


@tool("extract_tables", args_schema=FileSpanArgs)
def extract_tables_tool(file_path: str, start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Extract tables from a document between start_page and end_page.
    Returns: {"tables": [...], "table_count": int}
    """
    # Try agent path if enabled
    agent = _get_agent_if_enabled("extract_tables")
    if agent:
        state = _base_state(file_path, start_page, end_page)
        result = agent.run(state)
        tables = result.get("tables", [])
        return {"tables": tables, "table_count": len(tables)}
    
    # Fallback to utility
    state = _base_state(file_path, start_page, end_page)
    out = extract_tables_remote(state)
    tables = out.get("tables", [])
    return {"tables": tables, "table_count": len(tables)}


@tool("describe_images", args_schema=FileSpanArgs)
def describe_images_tool(file_path: str, start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Generate captions/descriptions for images in the specified page range.
    Returns: {"image_descriptions": ...}
    """
    agent = _get_agent_if_enabled("describe_images")
    if agent:
        state = _base_state(file_path, start_page, end_page)
        result = agent.run(state)
        return {"image_descriptions": result.get("image_descriptions", result)}
    
    state = _base_state(file_path, start_page, end_page)
    out = describe_images_remote(state)
    return {"image_descriptions": out.get("image_descriptions", out)}


@tool("summarize_text", args_schema=TextOrFileArgs)
def summarize_text_tool(text: Optional[str] = None, file_path: Optional[str] = None,
                        start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Summarize either raw text or a document (by file_path + optional page span).
    Returns: {"summary": "..."}
    """
    state: Dict[str, Any] = {
        "text": text,
        "start_page": start_page,
        "end_page": end_page,
    }
    if file_path:
        state.update(_base_state(file_path, start_page, end_page))
    
    agent = _get_agent_if_enabled("summarize")
    if agent:
        result = agent.run(state)
        return {"summary": result.get("summary", result)}
    
    out = summarize_remote(state)
    return {"summary": out.get("summary", out)}


@tool("classify_text", args_schema=TextOrFileArgs)
def classify_text_tool(text: Optional[str] = None, file_path: Optional[str] = None,
                       start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Classify a text or document content.
    Returns: {"classification": ...}
    """
    state: Dict[str, Any] = {
        "text": text,
        "start_page": start_page,
        "end_page": end_page,
    }
    if file_path:
        state.update(_base_state(file_path, start_page, end_page))
    
    agent = _get_agent_if_enabled("classify")
    if agent:
        result = agent.run(state)
        return {"classification": result.get("classification", result)}
    
    out = classify_remote(state)
    return {"classification": out.get("classification", out)}


@tool("extract_entities", args_schema=TextOrFileArgs)
def extract_entities_tool(text: Optional[str] = None, file_path: Optional[str] = None,
                          start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Perform Named Entity Recognition (NER) on text or a document.
    Returns: {"ner": ...}
    """
    state: Dict[str, Any] = {
        "text": text,
        "start_page": start_page,
        "end_page": end_page,
    }
    if file_path:
        state.update(_base_state(file_path, start_page, end_page))
    
    agent = _get_agent_if_enabled("ner")
    if agent:
        result = agent.run(state)
        return {"ner": result.get("ner", result)}
    
    out = ner_remote(state)
    return {"ner": out.get("ner", out)}


@tool("translate_text", args_schema=TranslateArgs)
def translate_text_tool(target_lang: str,
                        text: Optional[str] = None, file_path: Optional[str] = None,
                        start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Translate text or a document to target_lang (e.g., 'es', 'fr', 'de', 'Spanish').
    Returns: {"translation": "...", "target_lang": "..."}
    """
    state: Dict[str, Any] = {
        "text": text,
        "start_page": start_page,
        "end_page": end_page,
        "target_lang": target_lang,
    }
    if file_path:
        state.update(_base_state(file_path, start_page, end_page))
    
    agent = _get_agent_if_enabled("translate")
    if agent:
        result = agent.run(state)
        return {
            "translation": result.get("translation", result),
            "target_lang": target_lang
        }
    
    out = translate_remote(state)
    return {
        "translation": out.get("translation", out),
        "target_lang": target_lang
    }


@tool("signature_verification", args_schema=FileSpanArgs)
def signature_verification_tool(file_path: str, start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Verify signatures/stamps presence and authenticity indicators in specified page range.
    Returns: {"signature_verification": ...}
    """
    agent = _get_agent_if_enabled("signature_verification")
    if agent:
        state = _base_state(file_path, start_page, end_page)
        result = agent.run(state)
        return {"signature_verification": result.get("signature_verification", result)}
    
    state = _base_state(file_path, start_page, end_page)
    out = signature_verification_remote(state)
    return {"signature_verification": out.get("signature_verification", out)}


@tool("stamp_detection", args_schema=FileSpanArgs)
def stamp_detection_tool(file_path: str, start_page: int = 1, end_page: int = 1) -> Dict[str, Any]:
    """
    Detect stamps in a document in the specified page range.
    Returns: {"stamp_detection": ...}
    """
    agent = _get_agent_if_enabled("stamp_detection")
    if agent:
        state = _base_state(file_path, start_page, end_page)
        result = agent.run(state)
        return {"stamp_detection": result.get("stamp_detection", result)}
    
    state = _base_state(file_path, start_page, end_page)
    out = stamp_detection_remote(state)
    return {"stamp_detection": out.get("stamp_detection", out)}


@tool("finalize", args_schema=FinalizeArgs, return_direct=True)
def finalize_tool(content: Dict[str, Any]) -> Dict[str, Any]:
    """
    FINAL STEP ONLY. Call this at the end to return a concise JSON result to the UI.
    Whatever you pass in 'content' is returned directly and ends the run.
    """
    return content


def get_master_tools() -> List[Any]:
    """
    Export all tools for agent binding.
    """
    return [
        extract_text_tool,
        extract_tables_tool,
        describe_images_tool,
        summarize_text_tool,
        classify_text_tool,
        extract_entities_tool,
        translate_text_tool,
        signature_verification_tool,
        stamp_detection_tool,
        finalize_tool,
    ]