package com.dalab.discovery;

import static org.mockito.ArgumentMatchers.*;
import static org.mockito.Mockito.*;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.Collections;

import org.junit.jupiter.api.BeforeEach;
import org.junit.jupiter.api.Test;
import org.springframework.http.HttpHeaders;
import org.springframework.mock.env.MockEnvironment;
import org.springframework.mock.web.MockServletContext;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;

import com.dalab.discovery.crawler.config.CrawlerWebConfigurer;
import com.dalab.discovery.sd.config.WebConfigurerTestController;

import jakarta.servlet.Filter;
import jakarta.servlet.FilterRegistration;
import jakarta.servlet.Servlet;
import jakarta.servlet.ServletRegistration;
import tech.jhipster.config.JHipsterProperties;

/**
 * Unit tests for the {@link WebConfigurer} class.
 */
class WebConfigurerTest {

    private CrawlerWebConfigurer webConfigurer;

    private MockServletContext servletContext;

    private MockEnvironment env;

    private JHipsterProperties props;

    @BeforeEach
    public void setup() {
        servletContext = spy(new MockServletContext());
        doReturn(mock(FilterRegistration.Dynamic.class)).when(servletContext).addFilter(anyString(), any(Filter.class));
        doReturn(mock(ServletRegistration.Dynamic.class)).when(servletContext).addServlet(anyString(),
                any(Servlet.class));

        env = new MockEnvironment();
        props = new JHipsterProperties();

        webConfigurer = new CrawlerWebConfigurer(env, props);
    }

    @Test
    void shouldCorsFilterOnApiPath() throws Exception {
        props.getCors().setAllowedOrigins(Collections.singletonList("other.domain.com"));
        props.getCors().setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE"));
        props.getCors().setAllowedHeaders(Collections.singletonList("*"));
        props.getCors().setMaxAge(1800L);
        props.getCors().setAllowCredentials(true);

        MockMvc mockMvc = MockMvcBuilders.standaloneSetup(new WebConfigurerTestController())
                .addFilters(webConfigurer.corsFilter()).build();

        mockMvc
                .perform(
                        options("/api/test-cors")
                                .header(HttpHeaders.ORIGIN, "other.domain.com")
                                .header(HttpHeaders.ACCESS_CONTROL_REQUEST_METHOD, "POST"))
                .andExpect(status().isOk())
                .andExpect(header().string(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, "other.domain.com"))
                .andExpect(header().string(HttpHeaders.VARY, "Origin"))
                .andExpect(header().string(HttpHeaders.ACCESS_CONTROL_ALLOW_METHODS, "GET,POST,PUT,DELETE"))
                .andExpect(header().string(HttpHeaders.ACCESS_CONTROL_ALLOW_CREDENTIALS, "true"))
                .andExpect(header().string(HttpHeaders.ACCESS_CONTROL_MAX_AGE, "1800"));

        mockMvc
                .perform(get("/api/test-cors").header(HttpHeaders.ORIGIN, "other.domain.com"))
                .andExpect(status().isOk())
                .andExpect(header().string(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN, "other.domain.com"));
    }

    @Test
    void shouldCorsFilterOnOtherPath() throws Exception {
        props.getCors().setAllowedOrigins(Collections.singletonList("*"));
        props.getCors().setAllowedMethods(Arrays.asList("GET", "POST", "PUT", "DELETE"));
        props.getCors().setAllowedHeaders(Collections.singletonList("*"));
        props.getCors().setMaxAge(1800L);
        props.getCors().setAllowCredentials(true);

        MockMvc mockMvc = MockMvcBuilders.standaloneSetup(new WebConfigurerTestController())
                .addFilters(webConfigurer.corsFilter()).build();

        mockMvc
                .perform(get("/test/test-cors").header(HttpHeaders.ORIGIN, "other.domain.com"))
                .andExpect(status().isOk())
                .andExpect(header().doesNotExist(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
    }

    @Test
    void shouldCorsFilterDeactivatedForNullAllowedOrigins() throws Exception {
        props.getCors().setAllowedOrigins(null);

        MockMvc mockMvc = MockMvcBuilders.standaloneSetup(new WebConfigurerTestController())
                .addFilters(webConfigurer.corsFilter()).build();

        mockMvc
                .perform(get("/api/test-cors").header(HttpHeaders.ORIGIN, "other.domain.com"))
                .andExpect(status().isOk())
                .andExpect(header().doesNotExist(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
    }

    @Test
    void shouldCorsFilterDeactivatedForEmptyAllowedOrigins() throws Exception {
        props.getCors().setAllowedOrigins(new ArrayList<>());

        MockMvc mockMvc = MockMvcBuilders.standaloneSetup(new WebConfigurerTestController())
                .addFilters(webConfigurer.corsFilter()).build();

        mockMvc
                .perform(get("/api/test-cors").header(HttpHeaders.ORIGIN, "other.domain.com"))
                .andExpect(status().isOk())
                .andExpect(header().doesNotExist(HttpHeaders.ACCESS_CONTROL_ALLOW_ORIGIN));
    }
}