package com.example;

import static org.springframework.restdocs.headers.HeaderDocumentation.headerWithName;
import static org.springframework.restdocs.headers.HeaderDocumentation.responseHeaders;
import static org.springframework.restdocs.hypermedia.HypermediaDocumentation.linkWithRel;
import static org.springframework.restdocs.hypermedia.HypermediaDocumentation.links;
import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.document;
import static org.springframework.restdocs.mockmvc.MockMvcRestDocumentation.documentationConfiguration;
import static org.springframework.restdocs.mockmvc.RestDocumentationRequestBuilders.get;
import static org.springframework.restdocs.mockmvc.RestDocumentationRequestBuilders.post;
import static org.springframework.restdocs.mockmvc.RestDocumentationRequestBuilders.delete;
import static org.springframework.restdocs.mockmvc.RestDocumentationRequestBuilders.patch;
import static org.springframework.restdocs.mockmvc.RestDocumentationRequestBuilders.put;
import static org.springframework.restdocs.operation.preprocess.Preprocessors.preprocessRequest;
import static org.springframework.restdocs.operation.preprocess.Preprocessors.preprocessResponse;
import static org.springframework.restdocs.operation.preprocess.Preprocessors.prettyPrint;
import static org.springframework.restdocs.payload.PayloadDocumentation.fieldWithPath;
import static org.springframework.restdocs.payload.PayloadDocumentation.responseFields;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.status;
import static org.springframework.restdocs.snippet.Attributes.key;
import static org.springframework.restdocs.payload.PayloadDocumentation.requestFields;

import java.util.Arrays;
import java.util.HashMap;
import java.util.Map;

import org.junit.Before;
import org.junit.Rule;
import org.junit.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.SpringApplicationConfiguration;
import org.springframework.hateoas.MediaTypes;
import org.springframework.restdocs.RestDocumentation;
import org.springframework.restdocs.constraints.ConstraintDescriptions;
import org.springframework.restdocs.mockmvc.RestDocumentationResultHandler;
import org.springframework.restdocs.payload.FieldDescriptor;
import org.springframework.test.context.junit4.SpringJUnit4ClassRunner;
import org.springframework.test.context.web.WebAppConfiguration;
import org.springframework.test.web.servlet.MockMvc;
import org.springframework.test.web.servlet.setup.MockMvcBuilders;
import org.springframework.util.StringUtils;
import org.springframework.web.context.WebApplicationContext;

import com.fasterxml.jackson.databind.ObjectMapper;

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = SpringRestDocsApplication.class)
@WebAppConfiguration
public class ApiDocumentation {

	@Rule
	public final RestDocumentation restDocumentation = new RestDocumentation("target/generated-snippets");
	
	@Autowired
	private WebApplicationContext context;
	
	@Autowired
	private ObjectMapper objectMapper;
	
	private RestDocumentationResultHandler document; 
	
	private MockMvc mockMvc;
	
	@Before
	public void setUp() {
		this.document = document("{method-name}",preprocessRequest(prettyPrint()),preprocessResponse(prettyPrint()));
		this.mockMvc = MockMvcBuilders.webAppContextSetup(this.context).apply(documentationConfiguration(this.restDocumentation)).alwaysDo(this.document).build();
	}
	

	@Test
	public void headersExample() throws Exception {
		this.document.snippets(responseHeaders(headerWithName("Content-Type").description("The Content-Type of the payload, e.g. `application/hal+json`")));
		this.mockMvc.perform(get("/")).andExpect(status().isOk());
	}
	
	@Test
	public void indexExample() throws Exception {
		this.document.snippets(links(linkWithRel("crud").description("The <<resources-tags,Tags resource>>")),responseFields(fieldWithPath("_links").description("<<resources-index-links,Links>> to other resources")));
		this.mockMvc.perform(get("/")).andExpect(status().isOk());
	}
	
	
	@Test
	public void crudGetExample() throws Exception {
		
		Map<String, String> tag = new HashMap<String, String>();
		tag.put("name", "GET");

		String tagLocation =this.mockMvc.perform(get("/crud").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(tag))).andExpect(status().isOk()).andReturn().getResponse().getHeader("Location");

		Map<String, Object> crud = new HashMap<String, Object>();
		crud.put("title", "Sample Model");
		crud.put("body", "http://www.baeldung.com/");
		crud.put("tags", Arrays.asList(tagLocation));
		
		this.mockMvc.perform(get("/crud").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(crud))).andExpect(status().isOk());
	}
	
	@Test
	public void crudCreateExample() throws Exception {
		Map<String, String> tag = new HashMap<String, String>();
		tag.put("name", "CREATE");

		String tagLocation =this.mockMvc.perform(post("/crud").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(tag))).andExpect(status().isCreated()).andReturn().getResponse().getHeader("Location");

		Map<String, Object> crud = new HashMap<String, Object>();
		crud.put("title", "Sample Model");
		crud.put("body", "http://www.baeldung.com/");
		crud.put("tags", Arrays.asList(tagLocation));

		ConstrainedFields fields = new ConstrainedFields(CrudInput.class);
		this.document.snippets(requestFields(fields.withPath("title").description("The title of the note"),fields.withPath("body").description("The body of the note"),fields.withPath("tags").description("An array of tag resource URIs")));
		this.mockMvc.perform(post("/crud").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(crud))).andExpect(status().isCreated());
		
		
	}
	
	@Test
	public void crudDeleteExample() throws Exception {
		
		Map<String, String> tag = new HashMap<String, String>();
		tag.put("name", "DELETE");
		
		String tagLocation =this.mockMvc.perform(delete("/crud/10").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(tag))).andExpect(status().isOk()).andReturn().getResponse().getHeader("Location");
		Map<String, Object> crud = new HashMap<String, Object>();
		crud.put("title", "Sample Model");
		crud.put("body", "http://www.baeldung.com/");
		crud.put("tags", Arrays.asList(tagLocation));
		
		this.mockMvc.perform(delete("/crud/10").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(crud))).andExpect(status().isOk());
	}
	
	@Test
	public void crudPatchExample() throws Exception {
		
		Map<String, String> tag = new HashMap<String, String>();
		tag.put("name", "PATCH");
		
		String tagLocation =this.mockMvc.perform(patch("/crud/10").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(tag))).andExpect(status().isNoContent()).andReturn().getResponse().getHeader("Location");
		Map<String, Object> crud = new HashMap<String, Object>();
		crud.put("title", "Sample Model");
		crud.put("body", "http://www.baeldung.com/");
		crud.put("tags", Arrays.asList(tagLocation));
		
		this.mockMvc.perform(patch("/crud/10").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(crud))).andExpect(status().isNoContent());
	}
	
	
	@Test
	public void crudPutExample() throws Exception {
		Map<String, String> tag = new HashMap<String, String>();
		tag.put("name", "PUT");
		
		String tagLocation =this.mockMvc.perform(put("/crud/10").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(tag))).andExpect(status().isAccepted()).andReturn().getResponse().getHeader("Location");
		Map<String, Object> crud = new HashMap<String, Object>();
		crud.put("title", "Sample Model");
		crud.put("body", "http://www.baeldung.com/");
		crud.put("tags", Arrays.asList(tagLocation));
		
		this.mockMvc.perform(put("/crud/10").contentType(MediaTypes.HAL_JSON).content(this.objectMapper.writeValueAsString(crud))).andExpect(status().isAccepted());
	}
	
	
	@Test
	public void contextLoads() {
	}
	
	private static class ConstrainedFields {

		private final ConstraintDescriptions constraintDescriptions;

		ConstrainedFields(Class<?> input) {
			this.constraintDescriptions = new ConstraintDescriptions(input);
		}

		private FieldDescriptor withPath(String path) {
			return fieldWithPath(path).attributes(key("constraints").value(StringUtils.collectionToDelimitedString(this.constraintDescriptions.descriptionsForProperty(path), ". ")));
		}
	}
	
	
}