package com.wok.supportbot;

import com.wok.supportbot.config.ChatModelFactory;
import com.wok.supportbot.service.IntentRouter;
import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.mockito.ArgumentCaptor;
import org.springframework.ai.chat.messages.AssistantMessage;
import org.springframework.ai.chat.model.ChatModel;
import org.springframework.ai.chat.model.ChatResponse;
import org.springframework.ai.chat.model.Generation;
import org.springframework.ai.openai.OpenAiChatModel;
import org.springframework.ai.chat.prompt.Prompt;
import org.springframework.ai.openai.api.OpenAiApi;
import org.springframework.http.MediaType;
import org.springframework.test.web.client.MockRestServiceServer;
import org.springframework.web.client.RestClient;
import org.springframework.ai.openai.OpenAiChatOptions;
import org.springframework.test.util.ReflectionTestUtils;

import java.util.List;

import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.ArgumentMatchers.any;
import static org.springframework.test.web.client.match.MockRestRequestMatchers.jsonPath;
import static org.springframework.test.web.client.match.MockRestRequestMatchers.requestTo;
import static org.springframework.test.web.client.response.MockRestResponseCreators.withSuccess;
import static org.mockito.Mockito.*;

class IntentRouterTests {
    private final ChatModelFactory factory = mock(ChatModelFactory.class);
    private final ChatModel model = mock(ChatModel.class);
    private final IntentRouter router = new IntentRouter();

    @BeforeEach
    void setUp() {
        ReflectionTestUtils.setField(router, "chatModelFactory", factory);
        when(factory.getChatModel("CHAT")).thenReturn(model);
    }

    @Test
    void seedClassificationDisablesThinkingWithoutChangingAnswerDefaults() {
        OpenAiChatOptions defaults = OpenAiChatOptions.builder()
                .model("doubao-seed-2-0-mini-260428")
                .reasoningEffort("medium").maxTokens(2000).temperature(0.5).build();
        when(model.getDefaultOptions()).thenReturn(defaults);
        when(model.call(any(Prompt.class))).thenReturn(response("{\"intent\":\"RAG\",\"confidence\":0.95}"));

        IntentRouter.IntentResult result = router.route("打印小票的排版规则是什么");

        assertEquals("RAG", result.getIntent());
        assertEquals(0.95, result.getConfidence());
        ArgumentCaptor<Prompt> prompt = ArgumentCaptor.forClass(Prompt.class);
        verify(model).call(prompt.capture());
        OpenAiChatOptions options = assertInstanceOf(OpenAiChatOptions.class, prompt.getValue().getOptions());
        assertEquals("minimal", options.getReasoningEffort());
        assertEquals(128, options.getMaxTokens());
        assertTrue(prompt.getValue().getContents().contains("打印小票的排版规则是什么"));
        assertEquals("medium", defaults.getReasoningEffort());
        assertEquals(2000, defaults.getMaxTokens());
        assertEquals(0.5, defaults.getTemperature());
    }

    @Test
    void otherModelsDoNotReceiveSeedSpecificOptions() {
        when(model.getDefaultOptions()).thenReturn(OpenAiChatOptions.builder()
                .model("deepseek-v4-flash").maxTokens(2000).build());
        when(model.call(any(Prompt.class))).thenReturn(response("{\"intent\":\"CHITCHAT\",\"confidence\":0.9}"));

        assertEquals("CHITCHAT", router.route("谢谢你的帮助").getIntent());

        ArgumentCaptor<Prompt> prompt = ArgumentCaptor.forClass(Prompt.class);
        verify(model).call(prompt.capture());
        assertNull(prompt.getValue().getOptions());
    }

    @Test
    void invalidOrTruncatedClassificationStillFallsBackToRetrieval() {
        when(model.getDefaultOptions()).thenReturn(OpenAiChatOptions.builder()
                .model("doubao-seed-2-0-mini-260428").build());
        when(model.call(any(Prompt.class))).thenReturn(response("{\"intent\":"));

        assertEquals("RAG", router.route("如何办理退款").getIntent());
    }

    @Test
    void actualOpenAiRequestSendsFastClassificationOptions() {
        RestClient.Builder restClient = RestClient.builder();
        MockRestServiceServer server = MockRestServiceServer.bindTo(restClient).build();
        OpenAiChatModel realModel = OpenAiChatModel.builder()
                .openAiApi(OpenAiApi.builder().baseUrl("http://localhost").apiKey("test-key")
                        .restClientBuilder(restClient).build())
                .defaultOptions(OpenAiChatOptions.builder().model("doubao-seed-2-0-mini-260428")
                        .maxTokens(2000).temperature(0.5).build())
                .build();
        when(factory.getChatModel("CHAT")).thenReturn(realModel);
        server.expect(requestTo("http://localhost/v1/chat/completions"))
                .andExpect(jsonPath("$.model").value("doubao-seed-2-0-mini-260428"))
                .andExpect(jsonPath("$.reasoning_effort").value("minimal"))
                .andExpect(jsonPath("$.max_tokens").value(128))
                .andExpect(jsonPath("$.temperature").value(0.5))
                .andRespond(withSuccess("""
                        {"id":"classification","object":"chat.completion","created":1,
                         "model":"doubao-seed-2-0-mini-260428",
                         "choices":[{"index":0,"message":{"role":"assistant",
                         "content":"{\\"intent\\":\\"RAG\\",\\"confidence\\":0.9}"},"finish_reason":"stop"}]}
                        """, MediaType.APPLICATION_JSON));

        IntentRouter.IntentResult result = router.route("如何办理退款");
        assertEquals("RAG", result.getIntent());
        assertEquals(0.9, result.getConfidence());
        server.verify();
        assertEquals(2000, realModel.getDefaultOptions().getMaxTokens());
    }

    @Test
    void blankQuestionDoesNotCallModel() {
        assertEquals("RAG", router.route(" ").getIntent());
        verifyNoInteractions(model);
        verify(factory, never()).getChatModel(any());
    }

    private ChatResponse response(String text) {
        return new ChatResponse(List.of(new Generation(new AssistantMessage(text))));
    }
}