from __future__ import annotations

from typing import Iterable

from providers.prompt_loader import load_prompt
from skills import SkillStore
from tools.registry import ToolRegistry


DEFAULT_SYSTEM_PROMPT = load_prompt("base")["system"]


def build_system_prompt(
    *,
    skill_store: SkillStore,
    active_skills: Iterable[str],
    tool_registry: ToolRegistry,
    workspace: str | None = None,
    base_prompt: str = DEFAULT_SYSTEM_PROMPT,
) -> str:
    tool_fragment = ", ".join(tool_registry.names())
    prompt = f"{base_prompt}\nAvailable tools: {tool_fragment}."
    if workspace:
        prompt += f"\nWorkspace root: {workspace}."
    skill_fragment = skill_store.build_prompt_fragment(active_skills)
    if skill_fragment:
        prompt += f"\n\nLoaded skills:\n{skill_fragment}"
    return prompt