from io import StringIO
from itertools import product
from pathlib import Path
from typing import Any, Type
from unittest.mock import MagicMock

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

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

runner = CliRunner()


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

    args: dict[str, Any]
    conversation: Conversation
    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

    @property
    def name(self) -> str:
        """Get the name of the conversation."""
        return self.args.get("name", "")

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

    result = runner.invoke(app, ["chat", 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)]


@pytest.mark.parametrize(
    "argument,name",
    list(product(("--name", "-n"), ("", "foo"))),
    ids=[f"{arg} {name}" for arg, name in product(("--name", "-n"), ("", "foo"))],
)
def test_chat_with_name(
    argument: str, name: str, monkeypatch: MonkeyPatch, tmp_path: Path
) -> None:
    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.main, "get_chat", mock_get_chat)
    monkeypatch.setattr(llm_chat.cli.main, "get_console", mock_get_console)
    monkeypatch.setattr(llm_chat.cli.main, "read_user_input", mock_read_user_input)

    result = runner.invoke(app, ["chat", argument, name])
    assert result.exit_code == 0
    assert chat_fake.args["name"] == name


def test_load(monkeypatch: MonkeyPatch, tmp_path: Path) -> None:
    # Create a conversation object to save
    conversation = Conversation(
        messages=[
            Message(role=Role.SYSTEM, content="Hello!"),
            Message(role=Role.USER, content="Hi!"),
            Message(role=Role.ASSISTANT, content="How are you?"),
        ],
        model=Model.GPT3,
        temperature=0.5,
        completion_tokens=10,
        prompt_tokens=15,
        cost=0.000043,
    )

    # Save the conversation to a file
    file_path = tmp_path / "conversation.json"
    with file_path.open("w") as f:
        f.write(conversation.model_dump_json())

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

    def mock_get_chat() -> Type[ChatFake]:
        return ChatFake

    def mock_get_console() -> Console:
        return console

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

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

    # Load the conversation from the file
    result = runner.invoke(app, ["load", str(file_path)])

    assert result.exit_code == 0