package org.gcube.gcat.rest;

import javax.ws.rs.BadRequestException;
import javax.ws.rs.Consumes;
import javax.ws.rs.DELETE;
import javax.ws.rs.DefaultValue;
import javax.ws.rs.GET;
import javax.ws.rs.HeaderParam;
import javax.ws.rs.HttpMethod;
import javax.ws.rs.InternalServerErrorException;
import javax.ws.rs.NotAllowedException;
import javax.ws.rs.PUT;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.QueryParam;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.Context;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.Response;
import javax.ws.rs.core.Response.ResponseBuilder;
import javax.ws.rs.core.Response.Status;
import javax.ws.rs.core.UriInfo;

import org.gcube.datacatalogue.metadatadiscovery.DataCalogueMetadataFormatReader;
import org.gcube.gcat.ResourceInitializer;
import org.gcube.gcat.api.GCatConstants;
import org.gcube.gcat.profile.ISProfile;
import org.xml.sax.SAXException;

import org.gcube.com.fasterxml.jackson.databind.node.ArrayNode;

/**
 * @author Luca Frosini (ISTI - CNR)
 */
@Path(Profile.PROFILES)
public class Profile extends BaseREST implements org.gcube.gcat.api.interfaces.Profile<Response,Response> {
	
	public static final String PROFILE_NAME_PARAMETER = "PROFILE_NAME";
	public static final String PROFILE_VALIDATION_ERROR;
	
	public static final String CANNOT_MANAGE_PROFILE_SCHEMA = "You cannot manage the profile schema";
	
	static {
		StringBuilder validationError = new StringBuilder();
		validationError.append("The Profile is not valid because of the following error at validation time:\n%s\n\n");
		validationError.append("The XSD used to validate the profile is available at %s\n\n");
		validationError.append(
				"To check your profile you can use a tool such as Oxygen XML Editor or an online service such as the one available at:\n");
		validationError.append("- http://www.utilities-online.info/xsdvalidation/\n");
		validationError.append("- https://www.freeformatter.com/xml-validator-xsd.html\n");
		PROFILE_VALIDATION_ERROR = validationError.toString();
	}
	
	@Context
	private UriInfo uriInfo;
	
	/*
	 * Not used as REST method, implemented to respect {@link org.gcube.gcat.api.interfaces.Item} interface
	 */
	@Override
	public int count() {
		setCalledMethod("GET /" + PROFILES);
		try {
			ISProfile isProfile = new ISProfile();
			return isProfile.count();
		} catch(WebApplicationException e) {
			throw e;
		} catch(Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@GET
	@Produces(MediaType.APPLICATION_JSON)
	public String listOrCount(@QueryParam(GCatConstants.COUNT_PARAMETER) @DefaultValue("false") Boolean countOnly) {
		setCalledMethod("GET /" + PROFILES);
		try {
			ISProfile isProfile = new ISProfile();
			if(countOnly) {
				return createCountJson(isProfile.count());
			}else{
				ArrayNode arrayNode = isProfile.list();
				return isProfile.getMapper().writeValueAsString(arrayNode);
			}
		} catch(WebApplicationException e) {
			throw e;
		} catch(Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	/*
	 * Not used as REST method, implemented to respect {@link org.gcube.gcat.api.interfaces.Item} interface
	 */
	@Override
	public String list() {
		try {
			ISProfile isProfile = new ISProfile();
			ArrayNode arrayNode = isProfile.list();
			return isProfile.getMapper().writeValueAsString(arrayNode);
		} catch(WebApplicationException e) {
			throw e;
		} catch(Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	public static int PRETTY_PRINT_INDENT_FACTOR = 4;
	
	@GET
	@Path("/{" + PROFILE_NAME_PARAMETER + "}")
	@Produces({MediaType.APPLICATION_XML, ResourceInitializer.APPLICATION_JSON_CHARSET_UTF_8})
	public String read(@PathParam(PROFILE_NAME_PARAMETER) String name,
			@DefaultValue(MediaType.APPLICATION_XML) @HeaderParam("Accept") String accept) {
		setCalledMethod("GET /" + PROFILES + "/{" + PROFILE_NAME_PARAMETER + "}");
		try {
			// If the name is SCHEMA 
			if(name.compareToIgnoreCase(SCHEMA) == 0) {
				return DataCalogueMetadataFormatReader.getProfileSchemaString();
			}
			
			ISProfile isProfile = new ISProfile();
			boolean xml = false;
			if(accept.startsWith(MediaType.APPLICATION_XML)) {
				xml = true;
			}
			return isProfile.read(name, xml);
		} catch(WebApplicationException e) {
			throw e;
		} catch(Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@PUT
	@Path("/{" + PROFILE_NAME_PARAMETER + "}")
	@Consumes(MediaType.APPLICATION_XML)
	@Produces(MediaType.APPLICATION_XML)
	public Response createOrUpdate(@PathParam(PROFILE_NAME_PARAMETER) String name, String xml) {
		setCalledMethod("PUT /" + PROFILES + "/{" + PROFILE_NAME_PARAMETER + "}");
		try {
			if(name.compareToIgnoreCase(SCHEMA) == 0) {
				throw new NotAllowedException(CANNOT_MANAGE_PROFILE_SCHEMA, new Throwable(CANNOT_MANAGE_PROFILE_SCHEMA),
						HttpMethod.GET.toString(), HttpMethod.HEAD.toString());
			}
			ISProfile isProfile = new ISProfile();
			boolean created = isProfile.createOrUpdate(name, xml);
			ResponseBuilder responseBuilder = null;
			if(created) {
				responseBuilder = Response.status(Status.CREATED);
				responseBuilder.header(LOCATION_HEADER, uriInfo.getAbsolutePath());
			} else {
				responseBuilder = Response.status(Status.OK);
			}
			responseBuilder.entity(xml);
			return responseBuilder.type(MediaType.APPLICATION_XML).build();
		} catch(WebApplicationException e) {
			throw e;
		} catch(SAXException e) {
			String schemaURL = uriInfo.getRequestUri().toString().replace(name, SCHEMA);
			throw new BadRequestException(String.format(PROFILE_VALIDATION_ERROR, e.getMessage(), schemaURL));
		} catch(Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@DELETE
	@Path("/{" + PROFILE_NAME_PARAMETER + "}")
	public Response delete(@PathParam(PROFILE_NAME_PARAMETER) String name) {
		setCalledMethod("DELETE /" + PROFILES + "/{" + PROFILE_NAME_PARAMETER + "}");
		try {
			if(name.compareToIgnoreCase(SCHEMA) == 0) {
				throw new NotAllowedException(CANNOT_MANAGE_PROFILE_SCHEMA, new Throwable(CANNOT_MANAGE_PROFILE_SCHEMA),
						HttpMethod.GET.toString(), HttpMethod.HEAD.toString());
			}
			ISProfile isProfile = new ISProfile();
			isProfile.delete(name);
			return Response.status(Status.NO_CONTENT).build();
		} catch(WebApplicationException e) {
			throw e;
		} catch(Exception e) {
			throw new InternalServerErrorException(e);
		}
	}
	
	@Override
	public Response create(String name, String xml) {
		return createOrUpdate(name, xml);
		
	}
	
	@Override
	public String read(String name) {
		return read(name, MediaType.APPLICATION_XML);
	}
	
	@Override
	public String update(String name, String xml) {
		return createOrUpdate(name, xml).getEntity().toString();
	}

}