"""
python3 -m unittest openai_server.basic.test_openai_server.TestOpenAIServer.test_completion
python3 -m unittest openai_server.basic.test_openai_server.TestOpenAIServer.test_completion_stream
python3 -m unittest openai_server.basic.test_openai_server.TestOpenAIServer.test_chat_completion
python3 -m unittest openai_server.basic.test_openai_server.TestOpenAIServer.test_chat_completion_stream
"""

import json
import re
import unittest

import numpy as np
import openai
import requests

from sglang.srt.hf_transformers_utils import get_tokenizer
from sglang.srt.utils import kill_process_tree
from sglang.test.runners import TEST_RERANK_QUERY_DOCS
from sglang.test.test_utils import (
    DEFAULT_SMALL_CROSS_ENCODER_MODEL_NAME_FOR_TEST,
    DEFAULT_SMALL_MODEL_NAME_FOR_TEST,
    DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
    DEFAULT_URL_FOR_TEST,
    CustomTestCase,
    popen_launch_server,
)


class TestOpenAIServer(CustomTestCase):
    @classmethod
    def setUpClass(cls):
        cls.model = DEFAULT_SMALL_MODEL_NAME_FOR_TEST
        cls.base_url = DEFAULT_URL_FOR_TEST
        cls.api_key = "sk-123456"
        cls.process = popen_launch_server(
            cls.model,
            cls.base_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            api_key=cls.api_key,
        )
        cls.base_url += "/v1"
        cls.tokenizer = get_tokenizer(DEFAULT_SMALL_MODEL_NAME_FOR_TEST)

    @classmethod
    def tearDownClass(cls):
        kill_process_tree(cls.process.pid)

    def run_completion(
        self, echo, logprobs, use_list_input, parallel_sample_num, token_input
    ):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)
        prompt = "The capital of France is"
        if token_input:
            prompt_input = self.tokenizer.encode(prompt)
            num_prompt_tokens = len(prompt_input)
        else:
            prompt_input = prompt
            num_prompt_tokens = len(self.tokenizer.encode(prompt))

        if use_list_input:
            prompt_arg = [prompt_input, prompt_input]
            num_choices = len(prompt_arg)
            num_prompt_tokens *= 2
        else:
            prompt_arg = prompt_input
            num_choices = 1

        response = client.completions.create(
            model=self.model,
            prompt=prompt_arg,
            temperature=0,
            max_tokens=32,
            echo=echo,
            logprobs=logprobs,
            n=parallel_sample_num,
        )

        assert len(response.choices) == num_choices * parallel_sample_num

        if echo:
            text = response.choices[0].text
            assert text.startswith(prompt)

        if logprobs:
            assert response.choices[0].logprobs
            assert isinstance(response.choices[0].logprobs.tokens[0], str)
            assert isinstance(response.choices[0].logprobs.top_logprobs[1], dict)
            ret_num_top_logprobs = len(response.choices[0].logprobs.top_logprobs[1])

            # FIXME: Sometimes, some top_logprobs are missing in the return value. The reason is that some output id maps to the same output token and duplicate in the map
            # assert ret_num_top_logprobs == logprobs, f"{ret_num_top_logprobs} vs {logprobs}"
            assert ret_num_top_logprobs > 0

            # when echo=True and request.logprobs>0, logprob_start_len is 0, so the first token's logprob would be None.
            if not echo:
                assert response.choices[0].logprobs.token_logprobs[0]

        assert response.id
        assert response.created
        assert (
            response.usage.prompt_tokens == num_prompt_tokens
        ), f"{response.usage.prompt_tokens} vs {num_prompt_tokens}"
        assert response.usage.completion_tokens > 0
        assert response.usage.total_tokens > 0

    def run_completion_stream(
        self, echo, logprobs, use_list_input, parallel_sample_num, token_input
    ):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)
        prompt = "The capital of France is"
        if token_input:
            prompt_input = self.tokenizer.encode(prompt)
            num_prompt_tokens = len(prompt_input)
        else:
            prompt_input = prompt
            num_prompt_tokens = len(self.tokenizer.encode(prompt))

        if use_list_input:
            prompt_arg = [prompt_input, prompt_input]
            num_choices = len(prompt_arg)
            num_prompt_tokens *= 2
        else:
            prompt_arg = prompt_input
            num_choices = 1

        generator = client.completions.create(
            model=self.model,
            prompt=prompt_arg,
            temperature=0,
            max_tokens=32,
            echo=echo,
            logprobs=logprobs,
            stream=True,
            stream_options={"include_usage": True},
            n=parallel_sample_num,
        )

        is_firsts = {}
        for response in generator:
            usage = response.usage
            if usage is not None:
                assert usage.prompt_tokens > 0, f"usage.prompt_tokens was zero"
                assert usage.completion_tokens > 0, f"usage.completion_tokens was zero"
                assert usage.total_tokens > 0, f"usage.total_tokens was zero"
                continue

            index = response.choices[0].index
            is_first = is_firsts.get(index, True)

            if logprobs:
                assert response.choices[0].logprobs, f"no logprobs in response"
                assert isinstance(
                    response.choices[0].logprobs.tokens[0], str
                ), f"{response.choices[0].logprobs.tokens[0]} is not a string"
                if not (is_first and echo):
                    assert isinstance(
                        response.choices[0].logprobs.top_logprobs[0], dict
                    ), f"top_logprobs was not a dictionary"
                    ret_num_top_logprobs = len(
                        response.choices[0].logprobs.top_logprobs[0]
                    )
                    # FIXME: Sometimes, some top_logprobs are missing in the return value. The reason is that some output id maps to the same output token and duplicate in the map
                    # assert ret_num_top_logprobs == logprobs, f"{ret_num_top_logprobs} vs {logprobs}"
                    assert ret_num_top_logprobs > 0, f"ret_num_top_logprobs was 0"

            if is_first:
                if echo:
                    assert response.choices[0].text.startswith(
                        prompt
                    ), f"{response.choices[0].text} and all args {echo} {logprobs} {token_input} {is_first}"
                is_firsts[index] = False
            assert response.id, f"no id in response"
            assert response.created, f"no created in response"

        for index in [i for i in range(parallel_sample_num * num_choices)]:
            assert not is_firsts.get(
                index, True
            ), f"index {index} is not found in the response"

    def run_chat_completion(self, logprobs, parallel_sample_num):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)
        response = client.chat.completions.create(
            model=self.model,
            messages=[
                {"role": "system", "content": "You are a helpful AI assistant"},
                {
                    "role": "user",
                    "content": "What is the capital of France? Answer in a few words.",
                },
            ],
            temperature=0,
            logprobs=logprobs is not None and logprobs > 0,
            top_logprobs=logprobs,
            n=parallel_sample_num,
        )

        if logprobs:
            assert isinstance(
                response.choices[0].logprobs.content[0].top_logprobs[0].token, str
            )

            ret_num_top_logprobs = len(
                response.choices[0].logprobs.content[0].top_logprobs
            )
            assert (
                ret_num_top_logprobs == logprobs
            ), f"{ret_num_top_logprobs} vs {logprobs}"

        assert len(response.choices) == parallel_sample_num
        assert response.choices[0].message.role == "assistant"
        assert isinstance(response.choices[0].message.content, str)
        assert response.id
        assert response.created
        assert response.usage.prompt_tokens > 0
        assert response.usage.completion_tokens > 0
        assert response.usage.total_tokens > 0

    def run_chat_completion_stream(self, logprobs, parallel_sample_num=1):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)
        generator = client.chat.completions.create(
            model=self.model,
            messages=[
                {"role": "system", "content": "You are a helpful AI assistant"},
                {"role": "user", "content": "What is the capital of France?"},
            ],
            temperature=0,
            logprobs=logprobs is not None and logprobs > 0,
            top_logprobs=logprobs,
            stream=True,
            stream_options={"include_usage": True},
            n=parallel_sample_num,
        )

        is_firsts = {}
        is_finished = {}
        for response in generator:
            usage = response.usage
            if usage is not None:
                assert usage.prompt_tokens > 0, f"usage.prompt_tokens was zero"
                assert usage.completion_tokens > 0, f"usage.completion_tokens was zero"
                assert usage.total_tokens > 0, f"usage.total_tokens was zero"
                continue

            index = response.choices[0].index
            finish_reason = response.choices[0].finish_reason
            if finish_reason is not None:
                is_finished[index] = True

            data = response.choices[0].delta

            if is_firsts.get(index, True):
                assert (
                    data.role == "assistant"
                ), f"data.role was not 'assistant' for first chunk"
                is_firsts[index] = False
                continue

            if logprobs and not is_finished.get(index, False):
                assert response.choices[0].logprobs, f"logprobs was not returned"
                assert isinstance(
                    response.choices[0].logprobs.content[0].top_logprobs[0].token, str
                ), f"top_logprobs token was not a string"
                assert isinstance(
                    response.choices[0].logprobs.content[0].top_logprobs, list
                ), f"top_logprobs was not a list"
                ret_num_top_logprobs = len(
                    response.choices[0].logprobs.content[0].top_logprobs
                )
                assert (
                    ret_num_top_logprobs == logprobs
                ), f"{ret_num_top_logprobs} vs {logprobs}"

            assert (
                isinstance(data.content, str)
                or isinstance(data.reasoning_content, str)
                or (isinstance(data.tool_calls, list) and len(data.tool_calls) > 0)
                or response.choices[0].finish_reason
            )
            assert response.id
            assert response.created

        for index in [i for i in range(parallel_sample_num)]:
            assert not is_firsts.get(
                index, True
            ), f"index {index} is not found in the response"

    def test_completion(self):
        for echo in [False, True]:
            for logprobs in [None, 5]:
                for use_list_input in [True, False]:
                    for parallel_sample_num in [1, 2]:
                        for token_input in [False, True]:
                            self.run_completion(
                                echo,
                                logprobs,
                                use_list_input,
                                parallel_sample_num,
                                token_input,
                            )

    def test_completion_stream(self):
        # parallel sampling and list input are not supported in streaming mode
        for echo in [False, True]:
            for logprobs in [None, 5]:
                for use_list_input in [True, False]:
                    for parallel_sample_num in [1, 2]:
                        for token_input in [False, True]:
                            self.run_completion_stream(
                                echo,
                                logprobs,
                                use_list_input,
                                parallel_sample_num,
                                token_input,
                            )

    def test_chat_completion(self):
        for logprobs in [None, 5]:
            for parallel_sample_num in [1, 2]:
                self.run_chat_completion(logprobs, parallel_sample_num)

    def test_chat_completion_stream(self):
        for logprobs in [None, 5]:
            for parallel_sample_num in [1, 2]:
                self.run_chat_completion_stream(logprobs, parallel_sample_num)

    def test_regex(self):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)

        regex = (
            r"""\{\n"""
            + r"""   "name": "[\w]+",\n"""
            + r"""   "population": [\d]+\n"""
            + r"""\}"""
        )

        response = client.chat.completions.create(
            model=self.model,
            messages=[
                {"role": "system", "content": "You are a helpful AI assistant"},
                {"role": "user", "content": "Introduce the capital of France."},
            ],
            temperature=0,
            max_tokens=128,
            extra_body={"regex": regex},
        )
        text = response.choices[0].message.content

        try:
            js_obj = json.loads(text)
        except (TypeError, json.decoder.JSONDecodeError):
            print("JSONDecodeError", text)
            raise
        assert isinstance(js_obj["name"], str)
        assert isinstance(js_obj["population"], int)

    def test_penalty(self):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)

        response = client.chat.completions.create(
            model=self.model,
            messages=[
                {"role": "system", "content": "You are a helpful AI assistant"},
                {"role": "user", "content": "Introduce the capital of France."},
            ],
            temperature=0,
            max_tokens=32,
            frequency_penalty=1.0,
        )
        text = response.choices[0].message.content
        assert isinstance(text, str)

    def test_response_prefill(self):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)

        response = client.chat.completions.create(
            model="meta-llama/Llama-3.1-8B-Instruct",
            messages=[
                {"role": "system", "content": "You are a helpful AI assistant"},
                {
                    "role": "user",
                    "content": """
Extract the name, size, price, and color from this product description as a JSON object:

<description>
The SmartHome Mini is a compact smart home assistant available in black or white for only $49.99. At just 5 inches wide, it lets you control lights, thermostats, and other connected devices via voice or app—no matter where you place it in your home. This affordable little hub brings convenient hands-free control to your smart devices.
</description>
""",
                },
                {
                    "role": "assistant",
                    "content": "{\n",
                },
            ],
            temperature=0,
            extra_body={"continue_final_message": True},
        )

        assert (
            response.choices[0]
            .message.content.strip()
            .startswith('"name": "SmartHome Mini",')
        )

    def test_model_list(self):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)
        models = list(client.models.list())
        assert len(models) == 1
        assert isinstance(getattr(models[0], "max_model_len", None), int)

    def test_retrieve_model(self):
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)

        # Test retrieving an existing model
        retrieved_model = client.models.retrieve(self.model)
        self.assertEqual(retrieved_model.id, self.model)
        self.assertEqual(retrieved_model.root, self.model)

        # Test retrieving a non-existent model
        with self.assertRaises(openai.NotFoundError):
            client.models.retrieve("non-existent-model")


# -------------------------------------------------------------------------
#    EBNF Test Class: TestOpenAIServerEBNF
#    Launches the server with xgrammar, has only EBNF tests
# -------------------------------------------------------------------------
class TestOpenAIServerEBNF(CustomTestCase):
    @classmethod
    def setUpClass(cls):
        cls.model = DEFAULT_SMALL_MODEL_NAME_FOR_TEST
        cls.base_url = DEFAULT_URL_FOR_TEST
        cls.api_key = "sk-123456"

        # passing xgrammar specifically
        other_args = ["--grammar-backend", "xgrammar"]
        cls.process = popen_launch_server(
            cls.model,
            cls.base_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            api_key=cls.api_key,
            other_args=other_args,
        )
        cls.base_url += "/v1"
        cls.tokenizer = get_tokenizer(DEFAULT_SMALL_MODEL_NAME_FOR_TEST)

    @classmethod
    def tearDownClass(cls):
        kill_process_tree(cls.process.pid)

    def test_ebnf(self):
        """
        Ensure we can pass `ebnf` to the local openai server
        and that it enforces the grammar.
        """
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)
        ebnf_grammar = r"""
        root ::= "Hello" | "Hi" | "Hey"
        """
        pattern = re.compile(r"^(Hello|Hi|Hey)[.!?]*\s*$")

        response = client.chat.completions.create(
            model=self.model,
            messages=[
                {"role": "system", "content": "You are a helpful EBNF test bot."},
                {"role": "user", "content": "Say a greeting (Hello, Hi, or Hey)."},
            ],
            temperature=0,
            max_tokens=32,
            extra_body={"ebnf": ebnf_grammar},
        )
        text = response.choices[0].message.content.strip()
        self.assertTrue(len(text) > 0, "Got empty text from EBNF generation")
        self.assertRegex(text, pattern, f"Text '{text}' doesn't match EBNF choices")

    def test_ebnf_strict_json(self):
        """
        A stricter EBNF that produces exactly {"name":"Alice"} format
        with no trailing punctuation or extra fields.
        """
        client = openai.Client(api_key=self.api_key, base_url=self.base_url)
        ebnf_grammar = r"""
        root    ::= "{" pair "}"
        pair    ::= "\"name\"" ":" string
        string  ::= "\"" [A-Za-z]+ "\""
        """
        pattern = re.compile(r'^\{"name":"[A-Za-z]+"\}$')

        response = client.chat.completions.create(
            model=self.model,
            messages=[
                {"role": "system", "content": "EBNF mini-JSON generator."},
                {
                    "role": "user",
                    "content": "Generate single key JSON with only letters.",
                },
            ],
            temperature=0,
            max_tokens=64,
            extra_body={"ebnf": ebnf_grammar},
        )
        text = response.choices[0].message.content.strip()
        self.assertTrue(len(text) > 0, "Got empty text from EBNF strict JSON test")
        self.assertRegex(
            text, pattern, f"Text '{text}' not matching the EBNF strict JSON shape"
        )


class TestOpenAIV1Rerank(CustomTestCase):
    @classmethod
    def setUpClass(cls):
        cls.model = DEFAULT_SMALL_CROSS_ENCODER_MODEL_NAME_FOR_TEST
        cls.base_url = DEFAULT_URL_FOR_TEST
        cls.api_key = "sk-123456"
        cls.score_tolerance = 1e-2

        # Configure embedding-specific args
        other_args = [
            "--is-embedding",
            "--enable-metrics",
            "--disable-radix-cache",
            "--chunked-prefill-size",
            "-1",
            "--attention-backend",
            "torch_native",
        ]
        cls.process = popen_launch_server(
            cls.model,
            cls.base_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            api_key=cls.api_key,
            other_args=other_args,
        )
        cls.base_url += "/v1/rerank"

    @classmethod
    def tearDownClass(cls):
        kill_process_tree(cls.process.pid)

    def run_rerank(self, query, docs):
        response = requests.post(
            self.base_url,
            headers={
                "Authorization": f"Bearer {self.api_key}",
                "Content-Type": "application/json",
            },
            json={"query": query, "documents": docs},
        )

        return response.json()

    def test_rerank_single(self):
        """Test single rerank request"""
        query = TEST_RERANK_QUERY_DOCS[0]["query"]
        docs = TEST_RERANK_QUERY_DOCS[0]["documents"]

        response = self.run_rerank(query, docs)

        self.assertEqual(len(response), 1)
        self.assertTrue(isinstance(response[0]["score"], float))
        self.assertTrue(isinstance(response[0]["document"], str))
        self.assertTrue(isinstance(response[0]["index"], int))

    def test_rerank_batch(self):
        """Test batch rerank request"""
        query = TEST_RERANK_QUERY_DOCS[1]["query"]
        docs = TEST_RERANK_QUERY_DOCS[1]["documents"]

        response = self.run_rerank(query, docs)

        self.assertEqual(len(response), 2)
        self.assertTrue(isinstance(response[0]["score"], float))
        self.assertTrue(isinstance(response[1]["score"], float))
        self.assertTrue(isinstance(response[0]["document"], str))
        self.assertTrue(isinstance(response[1]["document"], str))
        self.assertTrue(isinstance(response[0]["index"], int))
        self.assertTrue(isinstance(response[1]["index"], int))


class TestOpenAIV1Score(CustomTestCase):
    @classmethod
    def setUpClass(cls):
        cls.model = DEFAULT_SMALL_MODEL_NAME_FOR_TEST
        cls.base_url = DEFAULT_URL_FOR_TEST
        cls.api_key = "sk-123456"

        cls.process = popen_launch_server(
            cls.model,
            cls.base_url,
            timeout=DEFAULT_TIMEOUT_FOR_SERVER_LAUNCH,
            api_key=cls.api_key,
        )
        cls.base_url += "/v1/score"
        cls.tokenizer = get_tokenizer(DEFAULT_SMALL_MODEL_NAME_FOR_TEST)

    @classmethod
    def tearDownClass(cls):
        kill_process_tree(cls.process.pid)

    def run_score(
        self, query, items, label_token_ids, apply_softmax=False, item_first=False
    ):
        response = requests.post(
            self.base_url,
            headers={
                "Authorization": f"Bearer {self.api_key}",
                "Content-Type": "application/json",
            },
            json={
                "model": self.model,
                "query": query,
                "items": items,
                "label_token_ids": label_token_ids,
                "apply_softmax": apply_softmax,
                "item_first": item_first,
            },
        )
        return response.json()

    def test_score_text_input(self):
        """Test scoring with text input"""
        query = "The capital of France is"
        items = ["Paris", "London", "Berlin"]

        # Get valid token IDs from the tokenizer
        label_token_ids = []
        for item in items:
            token_ids = self.tokenizer.encode(item, add_special_tokens=False)
            if not token_ids:
                self.fail(f"Failed to encode item: {item}")
            label_token_ids.append(token_ids[0])

        response = self.run_score(query, items, label_token_ids, apply_softmax=True)

        # Handle error responses
        if response.get("type") == "BadRequestError":
            self.fail(f"Score request failed with error: {response['message']}")

        # Verify response structure
        self.assertIn("scores", response, "Response should have a 'scores' field")
        self.assertIsInstance(response["scores"], list, "scores should be a list")
        self.assertEqual(
            len(response["scores"]),
            len(items),
            "Number of scores should match number of items",
        )

        # Each score should be a list of floats in the order of label_token_ids
        for i, score_list in enumerate(response["scores"]):
            self.assertIsInstance(score_list, list, f"Score {i} should be a list")
            self.assertEqual(
                len(score_list),
                len(label_token_ids),
                f"Score {i} length should match label_token_ids",
            )
            self.assertTrue(
                all(isinstance(v, float) for v in score_list),
                f"Score {i} values should be floats",
            )
            self.assertAlmostEqual(
                sum(score_list),
                1.0,
                places=6,
                msg=f"Score {i} probabilities should sum to 1",
            )

    def test_score_token_input(self):
        """Test scoring with token IDs input"""
        query = "The capital of France is"
        items = ["Paris", "London", "Berlin"]

        # Get valid token IDs
        query_ids = self.tokenizer.encode(query, add_special_tokens=False)
        item_ids = [
            self.tokenizer.encode(item, add_special_tokens=False) for item in items
        ]
        label_token_ids = [
            ids[0] for ids in item_ids if ids
        ]  # Get first token ID of each item

        response = self.run_score(
            query_ids, item_ids, label_token_ids, apply_softmax=True
        )

        # Handle error responses
        if response.get("type") == "BadRequestError":
            self.fail(f"Score request failed with error: {response['message']}")

        # Verify response structure
        self.assertIn("scores", response, "Response should have a 'scores' field")
        self.assertIsInstance(response["scores"], list, "scores should be a list")
        self.assertEqual(
            len(response["scores"]),
            len(items),
            "Number of scores should match number of items",
        )

        # Each score should be a list of floats in the order of label_token_ids
        for i, score_list in enumerate(response["scores"]):
            self.assertIsInstance(score_list, list, f"Score {i} should be a list")
            self.assertEqual(
                len(score_list),
                len(label_token_ids),
                f"Score {i} length should match label_token_ids",
            )
            self.assertTrue(
                all(isinstance(v, float) for v in score_list),
                f"Score {i} values should be floats",
            )
            self.assertAlmostEqual(
                sum(score_list),
                1.0,
                places=6,
                msg=f"Score {i} probabilities should sum to 1",
            )

    def test_score_error_handling(self):
        """Test error handling for invalid inputs"""
        query = "The capital of France is"
        items = ["Paris", "London", "Berlin"]

        # Test with invalid token ID
        response = requests.post(
            self.base_url,
            headers={
                "Authorization": f"Bearer {self.api_key}",
                "Content-Type": "application/json",
            },
            json={
                "model": self.model,
                "query": query,
                "items": items,
                "label_token_ids": [999999],  # Invalid token ID
                "apply_softmax": True,
            },
        )
        self.assertEqual(response.status_code, 400)
        error_response = response.json()
        self.assertEqual(error_response["type"], "BadRequestError")
        self.assertIn("Token ID 999999 is out of vocabulary", error_response["message"])


if __name__ == "__main__":
    unittest.main()
