"""
This code is the tool registration part. By registering the tool, the model can call the tool.
This code provides extended functionality to the model, enabling it to call and interact with a variety of utilities
through defined interfaces.
"""

from collections.abc import Callable
import copy
import inspect
import json
from pprint import pformat
import traceback
from types import GenericAlias
from typing import get_origin, Annotated
import subprocess

from .interface import ToolObservation

from .browser import tool_call as browser
from .cogview import tool_call as cogview
from .python import tool_call as python

ALL_TOOLS = {
    "simple_browser": browser,
    "python": python,
    "cogview": cogview,
}

_TOOL_HOOKS = {}
_TOOL_DESCRIPTIONS = []


def register_tool(func: Callable):
    tool_name = func.__name__
    tool_description = inspect.getdoc(func).strip()
    python_params = inspect.signature(func).parameters
    tool_params = []
    for name, param in python_params.items():
        annotation = param.annotation
        if annotation is inspect.Parameter.empty:
            raise TypeError(f"Parameter `{name}` missing type annotation")
        if get_origin(annotation) != Annotated:
            raise TypeError(f"Annotation type for `{name}` must be typing.Annotated")

        typ, (description, required) = annotation.__origin__, annotation.__metadata__
        typ: str = str(typ) if isinstance(typ, GenericAlias) else typ.__name__
        if not isinstance(description, str):
            raise TypeError(f"Description for `{name}` must be a string")
        if not isinstance(required, bool):
            raise TypeError(f"Required for `{name}` must be a bool")

        tool_params.append(
            {
                "name": name,
                "description": description,
                "type": typ,
                "required": required,
            }
        )
    tool_def = {
        "name": tool_name,
        "description": tool_description,
        "params": tool_params,
    }
    # print("[registered tool] " + pformat(tool_def))
    _TOOL_HOOKS[tool_name] = func
    _TOOL_DESCRIPTIONS.append(tool_def)

    return func


def dispatch_tool(tool_name: str, code: str, session_id: str) -> list[ToolObservation]:
    # Dispatch predefined tools
    if tool_name in ALL_TOOLS:
        return ALL_TOOLS[tool_name](code, session_id)
    
    code = code.strip().rstrip('<|observation|>').strip()

    # Dispatch custom tools
    try:
        tool_params = json.loads(code)
    except json.JSONDecodeError as e:
        err = f"Error decoding JSON: {e}"
        return [ToolObservation("system_error", err)]

    if tool_name not in _TOOL_HOOKS:
        err = f"Tool `{tool_name}` not found. Please use a provided tool."
        return [ToolObservation("system_error", err)]

    tool_hook = _TOOL_HOOKS[tool_name]
    try:
        ret: str = tool_hook(**tool_params)
        return [ToolObservation(tool_name, str(ret))]
    except:
        err = traceback.format_exc()
        return [ToolObservation("system_error", err)]


def get_tools() -> list[dict]:
    return copy.deepcopy(_TOOL_DESCRIPTIONS)


# Tool Definitions


@register_tool
def random_number_generator(
        seed: Annotated[int, "The random seed used by the generator", True],
        range: Annotated[tuple[int, int], "The range of the generated numbers", True],
) -> int:
    """
    Generates a random number x, s.t. range[0] <= x < range[1]
    """
    if not isinstance(seed, int):
        raise TypeError("Seed must be an integer")
    if not isinstance(range, tuple):
        raise TypeError("Range must be a tuple")
    if not isinstance(range[0], int) or not isinstance(range[1], int):
        raise TypeError("Range must be a tuple of integers")

    import random

    return random.Random(seed).randint(*range)


@register_tool
def get_weather(
        city_name: Annotated[str, "The name of the city to be queried", True],
) -> str:
    """
    Get the current weather for `city_name`
    """

    if not isinstance(city_name, str):
        raise TypeError("City name must be a string")

    key_selection = {
        "current_condition": [
            "temp_C",
            "FeelsLikeC",
            "humidity",
            "weatherDesc",
            "observation_time",
        ],
    }
    import requests

    try:
        resp = requests.get(f"https://wttr.in/{city_name}?format=j1")
        resp.raise_for_status()
        resp = resp.json()
        ret = {k: {_v: resp[k][0][_v] for _v in v} for k, v in key_selection.items()}
    except:
        import traceback

        ret = (
                "Error encountered while fetching weather data!\n" + traceback.format_exc()
        )

    return str(ret)


@register_tool
def get_shell(
        query: Annotated[str, "The command should run in Linux shell", True],
) -> str:
    """
    Use shell to run command
    """
    if not isinstance(query, str):
        raise TypeError("Command must be a string")
    try:
        result = subprocess.run(
            query,
            shell=True,
            check=True,
            stdout=subprocess.PIPE,
            stderr=subprocess.PIPE,
            text=True,
        )
        return result.stdout
    except subprocess.CalledProcessError as e:
        return e.stderr


if __name__ == "__main__":
    # print(dispatch_tool("get_shell", {"query": "pwd"}))
    print(get_tools())