import os
import re
from typing import Union

import pytest
from _pytest.monkeypatch import MonkeyPatch
from requests import Response
from requests.sessions import Session
from xinference_client.client.restful.restful_client import (
    Client,
    RESTfulChatModelHandle,
    RESTfulEmbeddingModelHandle,
    RESTfulGenerateModelHandle,
    RESTfulRerankModelHandle,
)
from xinference_client.types import Embedding, EmbeddingData, EmbeddingUsage


class MockXinferenceClass:
    def get_chat_model(self: Client, model_uid: str) -> Union[RESTfulGenerateModelHandle, RESTfulChatModelHandle]:
        if not re.match(r"https?:\/\/[^\s\/$.?#].[^\s]*$", self.base_url):
            raise RuntimeError("404 Not Found")

        if "generate" == model_uid:
            return RESTfulGenerateModelHandle(model_uid, base_url=self.base_url, auth_headers={})
        if "chat" == model_uid:
            return RESTfulChatModelHandle(model_uid, base_url=self.base_url, auth_headers={})
        if "embedding" == model_uid:
            return RESTfulEmbeddingModelHandle(model_uid, base_url=self.base_url, auth_headers={})
        if "rerank" == model_uid:
            return RESTfulRerankModelHandle(model_uid, base_url=self.base_url, auth_headers={})
        raise RuntimeError("404 Not Found")

    def get(self: Session, url: str, **kwargs):
        response = Response()
        if "v1/models/" in url:
            # get model uid
            model_uid = url.split("/")[-1] or ""
            if not re.match(
                r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}", model_uid
            ) and model_uid not in {"generate", "chat", "embedding", "rerank"}:
                response.status_code = 404
                response._content = b"{}"
                return response

            # check if url is valid
            if not re.match(r"^(https?):\/\/[^\s\/$.?#].[^\s]*$", url):
                response.status_code = 404
                response._content = b"{}"
                return response

            if model_uid in {"generate", "chat"}:
                response.status_code = 200
                response._content = b"""{
                    "model_type": "LLM",
                    "address": "127.0.0.1:43877",
                    "accelerators": [
                        "0",
                        "1"
                    ],
                    "model_name": "chatglm3-6b",
                    "model_lang": [
                        "en"
                    ],
                    "model_ability": [
                        "generate",
                        "chat"
                    ],
                    "model_description": "latest chatglm3",
                    "model_format": "pytorch",
                    "model_size_in_billions": 7,
                    "quantization": "none",
                    "model_hub": "huggingface",
                    "revision": null,
                    "context_length": 2048,
                    "replica": 1
                }"""
                return response

            elif model_uid == "embedding":
                response.status_code = 200
                response._content = b"""{
                    "model_type": "embedding",
                    "address": "127.0.0.1:43877",
                    "accelerators": [
                        "0",
                        "1"
                    ],
                    "model_name": "bge",
                    "model_lang": [
                        "en"
                    ],
                    "revision": null,
                    "max_tokens": 512
                }"""
                return response

        elif "v1/cluster/auth" in url:
            response.status_code = 200
            response._content = b"""{
                "auth": true
            }"""
            return response

    def _check_cluster_authenticated(self):
        self._cluster_authed = True

    def rerank(
        self: RESTfulRerankModelHandle, documents: list[str], query: str, top_n: int, return_documents: bool
    ) -> dict:
        # check if self._model_uid is a valid uuid
        if (
            not re.match(r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}", self._model_uid)
            and self._model_uid != "rerank"
        ):
            raise RuntimeError("404 Not Found")

        if not re.match(r"^(https?):\/\/[^\s\/$.?#].[^\s]*$", self._base_url):
            raise RuntimeError("404 Not Found")

        if top_n is None:
            top_n = 1

        return {
            "results": [
                {"index": i, "document": doc, "relevance_score": 0.9} for i, doc in enumerate(documents[:top_n])
            ]
        }

    def create_embedding(self: RESTfulGenerateModelHandle, input: Union[str, list[str]], **kwargs) -> dict:
        # check if self._model_uid is a valid uuid
        if (
            not re.match(r"[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}", self._model_uid)
            and self._model_uid != "embedding"
        ):
            raise RuntimeError("404 Not Found")

        if isinstance(input, str):
            input = [input]
        ipt_len = len(input)

        embedding = Embedding(
            object="list",
            model=self._model_uid,
            data=[
                EmbeddingData(index=i, object="embedding", embedding=[1919.810 for _ in range(768)])
                for i in range(ipt_len)
            ],
            usage=EmbeddingUsage(prompt_tokens=ipt_len, total_tokens=ipt_len),
        )

        return embedding


MOCK = os.getenv("MOCK_SWITCH", "false").lower() == "true"


@pytest.fixture
def setup_xinference_mock(request, monkeypatch: MonkeyPatch):
    if MOCK:
        monkeypatch.setattr(Client, "get_model", MockXinferenceClass.get_chat_model)
        monkeypatch.setattr(Client, "_check_cluster_authenticated", MockXinferenceClass._check_cluster_authenticated)
        monkeypatch.setattr(Session, "get", MockXinferenceClass.get)
        monkeypatch.setattr(RESTfulEmbeddingModelHandle, "create_embedding", MockXinferenceClass.create_embedding)
        monkeypatch.setattr(RESTfulRerankModelHandle, "rerank", MockXinferenceClass.rerank)
    yield

    if MOCK:
        monkeypatch.undo()