package eu.dnetlib.uoaorcidservice.controllers;

import com.google.gson.Gson;
import com.google.gson.GsonBuilder;
import eu.dnetlib.uoaorcidservice.configuration.properties.OrcidConfig;
import eu.dnetlib.uoaorcidservice.entities.ResultIdAndWork;
import eu.dnetlib.uoaorcidservice.entities.UserTokens;
import eu.dnetlib.uoaorcidservice.entities.Work;
import eu.dnetlib.uoaorcidservice.handlers.ConflictException;
import eu.dnetlib.uoaorcidservice.handlers.ContentNotFoundException;
import eu.dnetlib.uoaorcidservice.services.UserTokensService;
import eu.dnetlib.uoaorcidservice.services.WorkService;
import org.apache.log4j.Logger;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.*;
import org.springframework.security.access.AuthorizationServiceException;
import org.springframework.security.access.prepost.PreAuthorize;
import org.springframework.web.bind.annotation.*;
import org.springframework.web.client.DefaultResponseErrorHandler;
import org.springframework.web.client.RestTemplate;
import org.springframework.web.util.UriComponentsBuilder;

import javax.crypto.BadPaddingException;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;
import java.io.IOException;
import java.security.InvalidAlgorithmParameterException;
import java.security.InvalidKeyException;
import java.security.NoSuchAlgorithmException;
import java.security.spec.InvalidKeySpecException;
import java.util.*;

@RestController
@PreAuthorize("isAuthenticated()")
@CrossOrigin(origins = "*")
public class WorkController {
    private final Logger log = Logger.getLogger(this.getClass());
    private final Logger orcid_log = Logger.getLogger("ORCID-"+this.getClass().getName());

    @Autowired
    private OrcidConfig orcidConfig;

    @Autowired
    private UserTokensService userTokensService;

    @Autowired
    private WorkService workService;

    @RequestMapping(value = "/local/put-code", method = RequestMethod.GET)
    public List<String> getPutCode(@RequestParam String[] pids) {
        String userOrcid = userTokensService.getCurrentUserOrcid();
        List<Work> works = workService.getWorks(pids, userOrcid);
        if(works != null) {
            List<String> putCodes = new ArrayList<>();
            for(Work work : works) {
                putCodes.add(work.getPutCode());
            }
            return putCodes;
        }
        return null;
    }

    @RequestMapping(value = "/local/put-codes", method = RequestMethod.POST)
    public List<List<String>> getPutCodes(@RequestBody String[][] pids) {
        String userOrcid = userTokensService.getCurrentUserOrcid();
        List<List<String>> putCodes = new ArrayList();
        for(int i=0; i<pids.length; i++) {
            List<Work> works = workService.getWorks(pids[i], userOrcid);
            if (works != null) {
                List<String> putCodesOfOneRecord = new ArrayList<>();
                for(Work work : works) {
                    putCodesOfOneRecord.add(work.getPutCode());
                }
                putCodes.add(putCodesOfOneRecord);
            } else {
                putCodes.add(null);
            }
        }
        return putCodes;
    }

    @RequestMapping(value = "/local/works", method = RequestMethod.POST)
    public List<List<Work>> getLocalWorks(@RequestBody String[][] pids) {
        String userOrcid = userTokensService.getCurrentUserOrcid();
        if(userOrcid == null) {
            throw new AuthorizationServiceException("User is not registered");
        }

        List<List<Work>> returnedWorks = new ArrayList();
        for(int i=0; i<pids.length; i++) {
            List<Work> works = workService.getWorks(pids[i], userOrcid);
            returnedWorks.add(works);
        }
        return returnedWorks;
    }

    @RequestMapping(value = "/orcid/work/save", method = RequestMethod.POST)
    public Work saveWork(@RequestBody String resultString) throws Exception {
        log.debug("saveWork: result = " + resultString);

        Gson gson = new GsonBuilder().create();
        ResultIdAndWork result = gson.fromJson(resultString, ResultIdAndWork.class);

        UserTokens userTokens = userTokensService.getUserTokens();
        if(userTokens == null) {
            throw new AuthorizationServiceException("User is not registered");
        }
        String userOrcid = userTokens.getOrcid();
        String userAccessToken = userTokens.getAccessToken();

        if(userOrcid == null || userAccessToken == null) {
            throw new AuthorizationServiceException("User is not registered");
        }

//        log.debug("Access token: " + userAccessToken);
//        log.debug("User orcid: " + userOrcid);

        String url = orcidConfig.getApiURL() + userOrcid + "/work";

        RestTemplate restTemplate = new RestTemplate();
//        restTemplate.setRequestFactory(new HttpComponentsClientHttpRequestFactory());

        restTemplate.setErrorHandler(new DefaultResponseErrorHandler() {
            protected boolean hasError(HttpStatus statusCode) {
                if(statusCode == HttpStatus.UNAUTHORIZED) {
                    orcid_log.error("ORCID service returned UNAUTHORIZED: "+HttpStatus.UNAUTHORIZED);
                    throw new AuthorizationServiceException("User is not registered");
                }
                return false;
            }
        });
        HttpHeaders headers = new HttpHeaders();
        headers.add("Authorization", "Bearer " + userAccessToken);
        headers.add("Content-Type", "application/orcid+json;charset=UTF-8");

        HttpEntity<String> request = new HttpEntity<>(gson.toJson(result.getWork()), headers);

        orcid_log.info("request: "+request);
        orcid_log.info("url: "+url);
        ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.POST, request, String.class);

        if (response.getStatusCode() != HttpStatus.CREATED) {
            orcid_log.error("Saving work response code is: " + response.getStatusCode());
            orcid_log.error("Unexpected Response: "+response.getBody());

            if(response.getStatusCode() == HttpStatus.UNAUTHORIZED) {
                throw new AuthorizationServiceException("You are not allowed to save work");
            } else if(response.getStatusCode() == HttpStatus.CONFLICT) {
                throw new ConflictException("Work is already saved");
            } else {
                throw new Exception("Internal server error");
            }
//            return null;
        } else {
            orcid_log.info("Response: "+response);
//            log.debug("[success] Saving work response code is: " + response.getStatusCode());
//            log.debug(response.toString());

            Date date = new Date();

            Work workToSave = new Work();
            workToSave.setPids(result.getPids());
            workToSave.setOrcid(userOrcid);
            workToSave.setCreationDate(date);
            workToSave.setUpdateDate(date);
            workToSave.setDashboard(result.getDashboard());

            HttpHeaders responseHeaders = response.getHeaders();
            String locationPath = responseHeaders.getLocation().toString();
            String[] locationPathArray = locationPath.split("/");
            workToSave.setPutCode(locationPathArray[locationPathArray.length - 1]);

//            log.debug(gson.toJson(result.getPids()));
//            log.debug(responseHeaders.getLocation().toString());
//            log.debug(gson.toJson(workToSave));

            workService.saveWork(workToSave);

            return workToSave;
//            return "\""+workToSave.getPutCode()+"\"";
        }
    }

    @RequestMapping(value = "/orcid/work/update/{putCode}", method = RequestMethod.POST)
    public Work updateWork(@PathVariable String putCode,
                             @RequestBody String resultString) throws Exception {
        log.debug("updateWork: putCode = " + putCode);

        Gson gson = new GsonBuilder().create();
        ResultIdAndWork result = gson.fromJson(resultString, ResultIdAndWork.class);

        UserTokens userTokens = userTokensService.getUserTokens();
        if(userTokens == null) {
            throw new AuthorizationServiceException("User is not registered");
        }
        String userOrcid = userTokens.getOrcid();
        String userAccessToken = userTokens.getAccessToken();

        if(userOrcid == null || userAccessToken == null) {
            throw new AuthorizationServiceException("User is not registered");
        }

//        log.debug("Access token: " + userAccessToken);
//        log.debug("User orcid: " + userOrcid);

//        String url = "https://sandbox.orcid.org/v3.0/" + orcid.toString() + "/works";
//        String url = "https://api.sandbox.orcid.org/v3.0/" + userOrcid + "/work/" + putCode;
        String url = orcidConfig.getApiURL() + userOrcid + "/work/" + putCode;

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler() {
            protected boolean hasError(HttpStatus statusCode) {
                return false;
            }
        });
        HttpHeaders headers = new HttpHeaders();
//        headers.add("Accept", "application/json");
        headers.add("Authorization", "Bearer " + userAccessToken);
        headers.add("Content-Type", "application/orcid+json;charset=UTF-8");

        HttpEntity<String> request = new HttpEntity<>(gson.toJson(result.getWork()), headers);
        orcid_log.info("request: "+request);
        orcid_log.info("url: "+url);

        ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.PUT, request, String.class);
        if (response.getStatusCode() != HttpStatus.OK) {
            orcid_log.error("Updating work response code is: " + response.getStatusCode());
            orcid_log.error("Unexpected Response: "+response.getBody());

            if(response.getStatusCode() == HttpStatus.NOT_FOUND) {
                throw new ContentNotFoundException("Work to update not found");
            } else if(response.getStatusCode() == HttpStatus.UNAUTHORIZED) {
                throw new AuthorizationServiceException("You are not allowed to update work");
            } else if(response.getStatusCode() == HttpStatus.CONFLICT) {
                throw new ConflictException("Work is already saved");
            } else {
                throw new Exception("Internal server error");
            }
//            return null;
        } else {
            orcid_log.info("Response: "+response);
            Date date = new Date();

            Work localWork = workService.getLocalWorkByPutCode(putCode);
            localWork.setPids(result.getPids());
            localWork.setUpdateDate(date);

            workService.saveWork(localWork);
            return localWork;
//            return null;
        }

    }

    @RequestMapping(value = "/orcid/works", method = RequestMethod.GET)
    public String getWorksByPutCodes(@RequestParam String put_codes) throws BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, IOException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeySpecException {
        log.debug("getWorksByPutCodes: put_codes = " + put_codes);

        UserTokens userTokens = userTokensService.getUserTokens();
        if(userTokens == null) {
            throw new AuthorizationServiceException("User is not registered");
        }
        String userOrcid = userTokens.getOrcid();
        String userAccessToken = userTokens.getAccessToken();

        if(userOrcid == null || userAccessToken == null) {
            throw new AuthorizationServiceException("User is not registered");
        }

//        log.debug("Access token: " + userAccessToken);
//        log.debug("User orcid: " + userOrcid);

//        String url = "https://sandbox.orcid.org/v3.0/" + orcid.toString() + "/works";
        String url = orcidConfig.getApiURL()+userOrcid+"/works/"+put_codes;

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler() {
            protected boolean hasError(HttpStatus statusCode) {
                return false;
            }
        });
        HttpHeaders headers = new HttpHeaders();
        headers.add("Accept", "application/json");
        headers.add("Authorization", "Bearer " + userAccessToken);
        headers.add("Content-Type", "application/orcid+json;charset=UTF-8");

        HttpEntity<String> request = new HttpEntity<>(headers);
        orcid_log.info("request: "+request);
        orcid_log.info("url: "+url);

        ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.GET, request, String.class);
        if (response.getStatusCode() != HttpStatus.OK) {
            orcid_log.error("Getting works response code is: " + response.getStatusCode());
            orcid_log.error("Unexpected Response: "+response.getBody());
            return null;
        } else {
            orcid_log.info("Response: "+response);
            return response.getBody().toString();
        }
    }

    @RequestMapping(value = "/orcid/work/{putCode}/delete", method = RequestMethod.DELETE)
    public String deleteWork(@PathVariable String putCode) throws IOException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeySpecException {
        log.debug("deleteWork: putCode = " + putCode);

        UserTokens userTokens = userTokensService.getUserTokens();
        if(userTokens == null) {
            throw new AuthorizationServiceException("User is not registered");
        }
        String userOrcid = userTokens.getOrcid();
        String userAccessToken = userTokens.getAccessToken();

        if(userOrcid == null || userAccessToken == null) {
            throw new AuthorizationServiceException("User is not registered");
        }

//        log.debug("Access token: " + userAccessToken);
//        log.debug("User orcid: " + userOrcid);

        String url = orcidConfig.getApiURL()+userOrcid+"/work/" + putCode;

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler() {
            protected boolean hasError(HttpStatus statusCode) {
                return false;
            }
        });
        HttpHeaders headers = new HttpHeaders();
//        headers.add("Accept", "application/json");
        headers.add("Authorization", "Bearer " + userAccessToken);
        headers.add("Content-Type", "application/orcid+json;charset=UTF-8");

        HttpEntity<String> request = new HttpEntity<>(headers);
        orcid_log.info("request: "+request);
        orcid_log.info("url: "+url);

        ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.DELETE, request, String.class);
        if (response.getStatusCode() != HttpStatus.NO_CONTENT) {
            orcid_log.error("Deleting work response code is: " + response.getStatusCode());
            orcid_log.error("Unexpected Response: "+response.getBody());

            if(response.getStatusCode() == HttpStatus.NOT_FOUND) {
                workService.deleteWork(putCode);
                return putCode;
            }
            if(response.getStatusCode() == HttpStatus.UNAUTHORIZED) {
                throw new AuthorizationServiceException("You are not allowed to delete work");
            }
            return null;
        } else {
            orcid_log.info("Response: "+response);

            workService.deleteWork(putCode);

            return putCode;
        }

    }

    @RequestMapping(value = "/orcid/works/delete", method = RequestMethod.POST)
    public List<String> deleteWorks(@RequestBody List<String> putCodes) throws IOException, BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeySpecException {
        log.debug("deleteWorks: putCodes = " + putCodes);

        UserTokens userTokens = userTokensService.getUserTokens();
        if(userTokens == null) {
            throw new AuthorizationServiceException("User is not registered");
        }
        String userOrcid = userTokens.getOrcid();
        String userAccessToken = userTokens.getAccessToken();

        if(userOrcid == null || userAccessToken == null) {
            throw new AuthorizationServiceException("User is not registered");
        }

//        log.debug("Access token: " + userAccessToken);
//        log.debug("User orcid: " + userOrcid);

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler() {
            protected boolean hasError(HttpStatus statusCode) {
                return false;
            }
        });
        HttpHeaders headers = new HttpHeaders();
//        headers.add("Accept", "application/json");
        headers.add("Authorization", "Bearer " + userAccessToken);
        headers.add("Content-Type", "application/orcid+json;charset=UTF-8");

        HttpEntity<String> request = new HttpEntity<>(headers);

        List<String> deletedPutCodes = new ArrayList<>();
        int index = 0;
        for(String putCode : putCodes) {
            String url = orcidConfig.getApiURL()+userOrcid+"/work/" + putCode;
//            UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url);

            orcid_log.info("request: "+request);
            orcid_log.info("url: "+url);

            ResponseEntity<String> response = restTemplate.exchange(url, HttpMethod.DELETE, request, String.class);
            if (response.getStatusCode() != HttpStatus.NO_CONTENT) {
                orcid_log.error("Deleting work response code is: " + response.getStatusCode());
                orcid_log.error("Unexpected Response: "+response.getBody());

                if(index == 0 && response.getStatusCode() == HttpStatus.UNAUTHORIZED) {
                    throw new AuthorizationServiceException("You are not allowed to delete work");
                }
                if (response.getStatusCode() == HttpStatus.NOT_FOUND) {
                    workService.deleteWork(putCode);
                    deletedPutCodes.add(putCode);
                } else {
                    deletedPutCodes.add(null);
                }
            } else {
                orcid_log.info("Response: "+response);

                workService.deleteWork(putCode);

                deletedPutCodes.add(putCode);
            }
            index++;
        }
        return deletedPutCodes;
    }

    @RequestMapping(value = "/orcid/work", method = RequestMethod.GET)
    public List<String> getWorksOfReuslt(@RequestParam String[] pids, @RequestParam String orcid) throws BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeySpecException, IOException {
        log.debug("getWorks: pids = " + pids + " - orcid = "+orcid);

        List<Work> works = workService.getWorks(pids, orcid);

        String userAccessToken = userTokensService.getUserAccessToken(orcid);
//        log.debug("Access token: " + userAccessToken);

        RestTemplate restTemplate = new RestTemplate();
        restTemplate.setErrorHandler(new DefaultResponseErrorHandler() {
            protected boolean hasError(HttpStatus statusCode) {
                return false;
            }
        });
        HttpHeaders headers = new HttpHeaders();
        headers.add("Accept", "application/json");
        headers.add("Authorization", "Bearer " + userAccessToken);
        headers.add("Content-Type", "application/orcid+json;charset=UTF-8");

        HttpEntity<String> request = new HttpEntity<>(headers);

        List<String> responseValues = new ArrayList<>();

        for(Work work : works) {
            String url = orcidConfig.getApiURL() + orcid + "/work/" + work.getPutCode();
            UriComponentsBuilder builder = UriComponentsBuilder.fromHttpUrl(url);
            orcid_log.info("request: "+request);
            orcid_log.info("url: "+url);

            ResponseEntity<String> response = restTemplate.exchange(builder.toUriString(), HttpMethod.GET, request, String.class);
            if (response.getStatusCode() != HttpStatus.OK) {
                orcid_log.error("Getting work response code is: " + response.getStatusCode());
                orcid_log.error("Unexpected Response: "+response.getBody());

                if (response.getStatusCode() == HttpStatus.NOT_FOUND) {
//                work.setPutCode(null);
//                workService.saveWork(work);
                    workService.deleteWork(work.getPutCode());
                }

                responseValues.add(null);
            } else {
                orcid_log.info("Response: "+response);
                responseValues.add(response.getBody().toString());
            }
        }
        return responseValues;
    }

//    @PreAuthorize("isAuthenticated()")
//    @RequestMapping(value = "/local/works", method = RequestMethod.GET)
//    public Map<String, Object> getLocalWorks(@RequestParam(required = false) Integer page, @RequestParam(required = false) Integer size)
//            throws BadPaddingException, InvalidKeyException, NoSuchAlgorithmException, IllegalBlockSizeException, NoSuchPaddingException, InvalidAlgorithmParameterException, InvalidKeySpecException, IOException {
//        log.debug("getWorks: page="+page+ " - size="+size);
//
//        String userOrcid = userTokensService.getCurrentUserOrcid();
//        if(userOrcid == null) {
//            throw new AuthorizationServiceException("User is not registered");
//        }
//
//        List<Work> works = workService.getLocalWorks(userOrcid);
//
//        Map<String, Object> response = new HashMap<>();
//        response.put("total", works.size());
//
//        if(page != null && page > 0 && size != null && size > 0) {
//            int from = (page-1)*size;
//            int to = page*size;
//
////            log.debug("size: "+works.size());
//            if(to > works.size()) {
//                to = works.size();
//            }
////            log.debug("from="+from+" - to="+to);
//
////            int index = 0;
////            Iterator<Work> iterator = works.iterator();
////            while(iterator.hasNext()) {
////                iterator.next();
////                if(index < from || index > to) {
////                    iterator.remove();
////                }
////                index++;
////            }
//            if(from < to) {
//                response.put("results", works.subList(from, to));
//                return response;
//            }
//        }
//        response.put("results", works);
//        return response;
//    }

    @RequestMapping(value = "/local/works", method = RequestMethod.GET)
    public List<Work> getMyLocalWorks() {
        log.debug("getMyWorks");
//
        String userOrcid = userTokensService.getCurrentUserOrcid();
        if(userOrcid == null) {
            throw new AuthorizationServiceException("User is not registered");
        }
//
        List<Work> works = workService.getLocalWorks(userOrcid);
//
        return works;
    }
}