# retoor <retoor@molodetz.nl>

from __future__ import annotations

import json
import logging
import re
import uuid
from typing import Any, Awaitable, Callable

from devplacepy.services.devii.errors import ToolInputError
from devplacepy.services.devii.virtual_tools.store import VirtualToolStore

logger = logging.getLogger("devii.virtual_tools.controller")

NAME_PATTERN = re.compile(r"^[a-zA-Z][a-zA-Z0-9_]{1,40}$")
PREVIEW_CHARS = 200

Evaluator = Callable[[str], Awaitable[str]]


def _serialize(row: dict[str, Any], full: bool = False) -> dict[str, Any]:
    data = {
        "name": row.get("name"),
        "description": row.get("description"),
        "input_description": row.get("input_description") or "",
        "enabled": bool(row.get("enabled", 1)),
        "updated_at": row.get("updated_at"),
    }
    if full:
        data["prompt"] = row.get("prompt") or ""
    else:
        data["prompt_preview"] = (row.get("prompt") or "")[:PREVIEW_CHARS]
    return data


class VirtualToolController:
    def __init__(self, store: VirtualToolStore, evaluator: Evaluator, builtin_names: set[str]) -> None:
        self._store = store
        self._evaluator = evaluator
        self._builtin_names = builtin_names

    async def dispatch(self, name: str, arguments: dict[str, Any]) -> str:
        handlers = {
            "tool_create": self._create,
            "tool_list": self._list,
            "tool_get": self._get,
            "tool_update": self._update,
            "tool_delete": self._delete,
        }
        handler = handlers.get(name)
        if handler is None:
            raise ToolInputError(f"Unknown virtual-tool action: {name}")
        return handler(arguments)

    def has(self, name: str) -> bool:
        row = self._store.find(name)
        return bool(row and row.get("enabled", 1))

    async def run(self, name: str, arguments: dict[str, Any]) -> str:
        row = self._store.find(name)
        if not row or not row.get("enabled", 1):
            raise ToolInputError(f"No enabled virtual tool named '{name}'.")
        user_input = str(arguments.get("input", "")).strip()
        prompt = row.get("prompt") or ""
        composed = f"{prompt}\n\nUser input: {user_input}" if user_input else prompt
        result = await self._evaluator(composed)
        return json.dumps({"status": "success", "tool": name, "result": result}, ensure_ascii=False)

    def _require_name(self, arguments: dict[str, Any]) -> str:
        name = str(arguments.get("name", "")).strip()
        if not name:
            raise ToolInputError("A tool 'name' is required.")
        return name

    def _create(self, arguments: dict[str, Any]) -> str:
        name = self._require_name(arguments)
        if not NAME_PATTERN.match(name):
            raise ToolInputError(
                "Tool name must be 2-41 characters: a letter followed by letters, digits, or underscores."
            )
        if name in self._builtin_names:
            raise ToolInputError(f"'{name}' is a built-in tool name; choose a different name.")
        if self._store.find(name):
            raise ToolInputError(f"A tool named '{name}' already exists; use tool_update to change it.")
        description = str(arguments.get("description", "")).strip()
        prompt = str(arguments.get("prompt", "")).strip()
        if not description:
            raise ToolInputError("A 'description' is required so the tool can be triggered correctly.")
        if not prompt:
            raise ToolInputError("A 'prompt' is required: the instruction the tool runs when called.")
        record = {
            "uid": uuid.uuid4().hex,
            "name": name,
            "description": description,
            "prompt": prompt,
            "input_description": str(arguments.get("input_description", "")).strip(),
            "enabled": 1,
        }
        stored = self._store.create(record)
        return json.dumps({"status": "created", "tool": _serialize(stored)}, ensure_ascii=False)

    def _list(self, arguments: dict[str, Any]) -> str:
        rows = self._store.list()
        return json.dumps(
            {"count": len(rows), "tools": [_serialize(row) for row in rows]}, ensure_ascii=False
        )

    def _get(self, arguments: dict[str, Any]) -> str:
        name = self._require_name(arguments)
        row = self._store.find(name)
        if not row:
            raise ToolInputError(f"No tool named '{name}'.")
        return json.dumps({"tool": _serialize(row, full=True)}, ensure_ascii=False)

    def _update(self, arguments: dict[str, Any]) -> str:
        name = self._require_name(arguments)
        row = self._store.find(name)
        if not row:
            raise ToolInputError(f"No tool named '{name}'.")
        changes: dict[str, Any] = {}
        if "description" in arguments and str(arguments["description"]).strip():
            changes["description"] = str(arguments["description"]).strip()
        if "prompt" in arguments and str(arguments["prompt"]).strip():
            changes["prompt"] = str(arguments["prompt"]).strip()
        if "input_description" in arguments:
            changes["input_description"] = str(arguments["input_description"]).strip()
        if "enabled" in arguments and arguments["enabled"] is not None:
            changes["enabled"] = 1 if str(arguments["enabled"]).strip().lower() in ("1", "true", "yes", "on") else 0
        if not changes:
            raise ToolInputError("No updatable fields supplied (description, prompt, input_description, enabled).")
        self._store.update(name, changes)
        return json.dumps({"status": "updated", "tool": _serialize(self._store.find(name))}, ensure_ascii=False)

    def _delete(self, arguments: dict[str, Any]) -> str:
        name = self._require_name(arguments)
        deleted = self._store.delete(name)
        if not deleted:
            raise ToolInputError(f"No tool named '{name}'.")
        return json.dumps({"status": "deleted", "name": name}, ensure_ascii=False)