"""
app/nodes/tool_executor.py — CHECKPOINT 1: Tool execution

Fix: Format tool results as natural language instead of raw key:value dump.
"""
from app.state import AgentState
from app.tools import TOOL_MAP


def tool_executor_node(state: AgentState) -> AgentState:
    results = []

    for tc in state.get("tool_calls", []):
        tool_name = tc["name"]
        tool_args = tc.get("args", {})
        if tool_name in TOOL_MAP:
            result = TOOL_MAP[tool_name].invoke(tool_args)
            print(f"[TOOL] {tool_name}({tool_args}) → {result}")
            results.append({"tool": tool_name, "result": result})
        else:
            results.append({"tool": tool_name, "result": "Tool not found."})

    # Format as readable natural language instead of raw "tool: result" dump
    if results:
        if len(results) == 1:
            response = str(results[0]["result"])
        else:
            lines = [f"- **{r['tool']}**: {r['result']}" for r in results]
            response = "\n".join(lines)

        log = state.get("node_log", []) + [f"tool_executor ({', '.join(r['tool'] for r in results)})"]
        return {**state, "tool_results": results, "response": response, "node_log": log}

    return state