"""Meta-skill: create multi-step skills at runtime."""

from __future__ import annotations

import textwrap
from pathlib import Path

from . import tool


@tool("build_skill", "Create a new multi-step skill from a description", category="meta")
def build_skill(name: str, description: str, steps: str, ctx: dict = None) -> str:
    """Generate a new skill and save it to the skills directory.

    Args:
        name: Skill name (snake_case)
        description: What the skill does
        steps: Python code implementing the skill steps (must use @skill decorator)
    """
    if not name.isidentifier():
        return f"Invalid skill name: {name}. Must be a valid Python identifier."

    if not ctx or not ctx.get("config"):
        return "Config context not available."

    skills_dir = ctx["config"].skills_dir
    skills_dir.mkdir(parents=True, exist_ok=True)

    module_code = textwrap.dedent(f'''\
        """Auto-generated skill: {description}"""
        from __future__ import annotations
        from cheddahbot.skills import skill

        {steps}
    ''')

    file_path = skills_dir / f"{name}.py"
    if file_path.exists():
        return f"Skill '{name}' already exists. Choose a different name."

    file_path.write_text(module_code, encoding="utf-8")

    # Try to load it
    try:
        from cheddahbot.skills import load_skill
        load_skill(file_path)
        return f"Skill '{name}' created at {file_path}"
    except Exception as e:
        return f"Skill created at {file_path} but failed to load: {e}"