import json
from typing import Any, Dict, Optional

from langchain_core.tools import tool
from langgraph.prebuilt import create_react_agent

import tools as pipeline_tools

_AGENT_CONTEXT: Dict[str, Any] = {
    "csv_path": None,
    "output_dir": ".",
}


def _topic_summary(result: pipeline_tools.AnalysisResult) -> Dict[str, Any]:
    table = result.topic_table
    top_labels = table.sort_values("Count", ascending=False)["Label"].head(10).tolist() if not table.empty else []

    return {
        "source": result.source_column,
        "papers": result.paper_count,
        "analysis_units": result.unit_count,
        "topic_count": int(len(table)),
        "top_labels": top_labels,
    }


@tool
def run_abstract_analysis_tool() -> str:
    """Run Braun and Clarke thematic pipeline on the Abstract column."""
    result = pipeline_tools.run_single_analysis(
        mode="abstract",
        csv_path=_AGENT_CONTEXT.get("csv_path"),
        output_dir=_AGENT_CONTEXT.get("output_dir", "."),
    )
    payload = {
        "status": "ok",
        "summary": _topic_summary(result),
    }
    return json.dumps(payload, indent=2)


@tool
def run_title_analysis_tool() -> str:
    """Run Braun and Clarke thematic pipeline on the Title column."""
    result = pipeline_tools.run_single_analysis(
        mode="title",
        csv_path=_AGENT_CONTEXT.get("csv_path"),
        output_dir=_AGENT_CONTEXT.get("output_dir", "."),
    )
    payload = {
        "status": "ok",
        "summary": _topic_summary(result),
    }
    return json.dumps(payload, indent=2)


@tool
def run_full_pipeline_tool() -> str:
    """Run full end-to-end pipeline for abstract and title, then generate comparison and narrative files."""
    result = pipeline_tools.run_full_pipeline(
        csv_path=_AGENT_CONTEXT.get("csv_path"),
        output_dir=_AGENT_CONTEXT.get("output_dir", "."),
    )

    payload = {
        "status": "ok",
        "csv_path": result["csv_path"],
        "abstract_topics": int(len(result["abstract"].topic_table)),
        "title_topics": int(len(result["title"].topic_table)),
        "comparison_rows": int(len(result["comparison"])),
        "files": result["files"],
    }
    return json.dumps(payload, indent=2)


@tool
def get_output_files_tool() -> str:
    """Get generated deliverable file paths."""
    files = pipeline_tools.ensure_output_artifacts(_AGENT_CONTEXT.get("output_dir", "."))
    return json.dumps(files, indent=2)


def _fallback_router(message: str, csv_path: Optional[str], output_dir: str) -> str:
    lowered = message.lower()

    if "full" in lowered or "end to end" in lowered or "pipeline" in lowered or "compare" in lowered:
        result = pipeline_tools.run_full_pipeline(csv_path=csv_path, output_dir=output_dir)
        return (
            "Full pipeline complete. "
            f"Abstract topics: {len(result['abstract'].topic_table)} | "
            f"Title topics: {len(result['title'].topic_table)} | "
            f"Comparison rows: {len(result['comparison'])}."
        )

    if "abstract" in lowered:
        result = pipeline_tools.run_single_analysis(mode="abstract", csv_path=csv_path, output_dir=output_dir)
        return (
            "Abstract analysis complete. "
            f"Identified {len(result.topic_table)} topics from {result.unit_count} cleaned analysis units."
        )

    if "title" in lowered:
        result = pipeline_tools.run_single_analysis(mode="title", csv_path=csv_path, output_dir=output_dir)
        return (
            "Title analysis complete. "
            f"Identified {len(result.topic_table)} topics from {result.unit_count} cleaned analysis units."
        )

    files = pipeline_tools.ensure_output_artifacts(output_dir)
    return (
        "I can run 'abstract analysis', 'title analysis', or 'full pipeline'. "
        f"Current output files are available at: {files}"
    )


def run_agent_command(message: str, csv_path: Optional[str] = None, output_dir: str = ".") -> str:
    _AGENT_CONTEXT["csv_path"] = csv_path
    _AGENT_CONTEXT["output_dir"] = output_dir

    llm = pipeline_tools.create_groq_llm(temperature=0.1)
    if llm is None:
        return _fallback_router(message, csv_path=csv_path, output_dir=output_dir)

    tools = [
        run_abstract_analysis_tool,
        run_title_analysis_tool,
        run_full_pipeline_tool,
        get_output_files_tool,
    ]

    try:
        react_agent = create_react_agent(llm, tools)
        response = react_agent.invoke({"messages": [("user", message)]})
        messages = response.get("messages", [])
        if not messages:
            return _fallback_router(message, csv_path=csv_path, output_dir=output_dir)

        final_message = messages[-1]
        content = getattr(final_message, "content", str(final_message))
        return str(content)
    except Exception:
        return _fallback_router(message, csv_path=csv_path, output_dir=output_dir)