from io import StringIO
from pathlib import Path
from typing import Any
from unittest.mock import MagicMock

import pytest
from pytest import MonkeyPatch
from rich.console import Console
from typer.testing import CliRunner

import llm_chat
from llm_chat.chat import ChatProtocol
from llm_chat.cli import app
from llm_chat.models import Message, Role
from llm_chat.settings import OpenAISettings

runner = CliRunner()


class ChatFake:
    """Fake chat class for testing."""

    args: dict[str, Any]
    received_messages: list[str]
    settings: OpenAISettings

    def __init__(self, settings: OpenAISettings | None = None) -> None:
        if settings is not None:
            self.settings = settings
        else:
            self.settings = OpenAISettings()
        self.args = {}
        self.received_messages = []

    def _set_args(self, **kwargs: Any) -> None:
        self.args = kwargs

    @property
    def cost(self) -> float:
        """Get the cost of the conversation."""
        return 0.0
    
    @classmethod
    def load(
        cls, path: Path, api_key: str | None = None, history_dir: Path | None = None
    ) -> ChatProtocol:
        """Load a chat from a file."""
        return cls()

    def save(self) -> None:
        """Dummy save method."""
        pass

    def send_message(self, message: str) -> str:
        """Echo the received message."""
        self.received_messages.append(message)
        return message


def test_chat(monkeypatch: MonkeyPatch) -> None:
    chat_fake = ChatFake()
    output = StringIO()
    console = Console(file=output)

    def mock_get_chat(**_: Any) -> ChatProtocol:
        return chat_fake

    def mock_get_console() -> Console:
        return console

    mock_read_user_input = MagicMock(side_effect=["Hello", "/q"])

    monkeypatch.setattr(llm_chat.cli, "get_chat", mock_get_chat)
    monkeypatch.setattr(llm_chat.cli, "get_console", mock_get_console)
    monkeypatch.setattr(llm_chat.cli, "read_user_input", mock_read_user_input)

    result = runner.invoke(app, ["chat"])
    assert result.exit_code == 0
    assert chat_fake.received_messages == ["Hello"]


@pytest.mark.parametrize("argument", ["--context", "-c"], ids=["--context", "-c"])
def test_chat_with_context(
    argument: str, monkeypatch: MonkeyPatch, tmp_path: Path
) -> None:
    context = "Hello, world!"
    tmp_file = tmp_path / "context.txt"
    tmp_file.write_text(context)

    chat_fake = ChatFake()
    output = StringIO()
    console = Console(file=output)

    def mock_get_chat(**kwargs: Any) -> ChatProtocol:
        chat_fake._set_args(**kwargs)
        return chat_fake

    def mock_get_console() -> Console:
        return console

    mock_read_user_input = MagicMock(side_effect=["Hello", "/q"])

    monkeypatch.setattr(llm_chat.cli, "get_chat", mock_get_chat)
    monkeypatch.setattr(llm_chat.cli, "get_console", mock_get_console)
    monkeypatch.setattr(llm_chat.cli, "read_user_input", mock_read_user_input)

    result = runner.invoke(app, [argument, str(tmp_file)])
    assert result.exit_code == 0
    assert chat_fake.received_messages == ["Hello"]
    assert "context" in chat_fake.args
    assert chat_fake.args["context"] == [Message(role=Role.SYSTEM, content=context)]