package eu.openaire.urls_controller.controllers;

import com.google.common.collect.HashMultimap;
import eu.openaire.urls_controller.models.Assignment;
import eu.openaire.urls_controller.models.Datasource;
import eu.openaire.urls_controller.payloads.responces.AssignmentsResponse;
import eu.openaire.urls_controller.util.GenericUtils;
import eu.openaire.urls_controller.util.TestFileUtils;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.http.HttpStatus;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import java.sql.Timestamp;
import java.util.*;
import java.util.concurrent.atomic.AtomicLong;

@RestController
@RequestMapping("/test")
public class TestController extends GeneralController {

    private static final Logger logger = LoggerFactory.getLogger(TestController.class);

    @Autowired
    private TestFileUtils fileUtils;

    @Value("${services.pdfaggregation.controller.assignmentLimit}")
    private int assignmentLimit;

    private static final AtomicLong assignmentsBatchCounter = new AtomicLong(0);    // Just for the "getTestUrls"-endpoint.

    @GetMapping("test")
    public ResponseEntity<?> getTestUrls(@RequestParam String workerId, @RequestParam int workerAssignmentsLimit) {

        logger.info("Worker with id: \"" + workerId + "\", requested " + workerAssignmentsLimit + " test-assignments. The assignments-limit of the controller is: " + this.assignmentLimit);

        List<Assignment> assignments = new ArrayList<>();
        HashMultimap<String, String> loadedIdUrlPairs;
        boolean isFirstRun = true;
        boolean assignmentsLimitReached = false;
        Timestamp timestamp = new Timestamp(System.currentTimeMillis()); // Store it here, in order to have the same for all current records.

        // Start loading urls.
        while ( true ) {
            loadedIdUrlPairs = fileUtils.getNextIdUrlPairBatchFromJson(); // Take urls from jsonFile.

            if ( fileUtils.isFinishedLoading(loadedIdUrlPairs.isEmpty(), isFirstRun) )	// Throws RuntimeException which is automatically passed on.
                break;
            else
                isFirstRun = false;

            Set<Map.Entry<String, String>> pairs = loadedIdUrlPairs.entries();

            for ( Map.Entry<String,String> pair : pairs ) {
                if ( assignments.size() >= workerAssignmentsLimit ) {
                    assignmentsLimitReached = true;
                    break;
                }

                int randomNum = GenericUtils.getRandomNumber(1, 5);
                assignments.add(new Assignment(pair.getKey(), pair.getValue(), new Datasource("ID_" + randomNum, "NAME_" + randomNum), workerId, timestamp));
            }// end pairs-for-loop

            if ( assignmentsLimitReached ) {
                logger.debug("Done loading urls from the inputFile as the assignmentsLimit (" + workerAssignmentsLimit + ") was reached.");
                break;
            }
        }// end loading-while-loop

        Scanner scanner = fileUtils.inputScanner.get();
        if ( scanner != null ) // Check if the initial value is null.
            scanner.close();

        long curAssignmentsBatchCounter = assignmentsBatchCounter.incrementAndGet();
        logger.info("Sending batch_" +  curAssignmentsBatchCounter + " with " + assignments.size() + " assignments (" + fileUtils.duplicateIdUrlEntries.get() + " more assignments were discarded as duplicates), to worker with ID: " + workerId);
        return ResponseEntity.status(HttpStatus.OK).header("Content-Type", "application/json").body(new AssignmentsResponse(curAssignmentsBatchCounter, assignments));
    }
}