/*
 * Copyright 2017 Kuelap, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package io.mifos.portfolio.service.rest;

import io.mifos.anubis.annotation.AcceptedTokenType;
import io.mifos.anubis.annotation.Permittable;
import io.mifos.core.command.gateway.CommandGateway;
import io.mifos.core.lang.ServiceException;
import io.mifos.portfolio.api.v1.PermittableGroupIds;
import io.mifos.portfolio.api.v1.domain.BalanceSegmentSet;
import io.mifos.portfolio.service.internal.command.ChangeBalanceSegmentSetCommand;
import io.mifos.portfolio.service.internal.command.CreateBalanceSegmentSetCommand;
import io.mifos.portfolio.service.internal.command.DeleteBalanceSegmentSetCommand;
import io.mifos.portfolio.service.internal.service.BalanceSegmentSetService;
import io.mifos.portfolio.service.internal.service.CaseService;
import io.mifos.portfolio.service.internal.service.ProductService;
import org.springframework.http.HttpStatus;
import org.springframework.http.MediaType;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import javax.validation.Valid;

/**
 * @author Myrle Krantz
 */
@RestController
@RequestMapping("/products/{productidentifier}/balancesegmentsets/")
public class BalanceSegmentSetRestController {

  private final CommandGateway commandGateway;
  private final ProductService productService;
  private final BalanceSegmentSetService balanceSegmentSetService;
  private final CaseService caseService;

  public BalanceSegmentSetRestController(final CommandGateway commandGateway,
                                         final ProductService productService,
                                         final BalanceSegmentSetService balanceSegmentSetService,
                                         final CaseService caseService) {
    this.commandGateway = commandGateway;
    this.productService = productService;
    this.balanceSegmentSetService = balanceSegmentSetService;
    this.caseService = caseService;
  }

  @Permittable(value = AcceptedTokenType.TENANT, groupId = PermittableGroupIds.PRODUCT_MANAGEMENT)
  @RequestMapping(
      method = RequestMethod.POST,
      consumes = MediaType.APPLICATION_JSON_VALUE,
      produces = MediaType.APPLICATION_JSON_VALUE
  )
  public @ResponseBody
  ResponseEntity<Void> createBalanceSegmentSet(
      @PathVariable("productidentifier") final String productIdentifier,
      @RequestBody @Valid final BalanceSegmentSet instance) {
    checkThatProductExists(productIdentifier);
    checkThatSegmentSetDoesntExist(productIdentifier, instance.getIdentifier());
    checkProductChangeable(productIdentifier);

    this.commandGateway.process(new CreateBalanceSegmentSetCommand(productIdentifier, instance));
    return new ResponseEntity<>(HttpStatus.ACCEPTED);
  }

  @Permittable(value = AcceptedTokenType.TENANT, groupId = PermittableGroupIds.PRODUCT_MANAGEMENT)
  @RequestMapping(
      value = "{balancesegmentsetidentifier}",
      method = RequestMethod.GET,
      consumes = MediaType.ALL_VALUE,
      produces = MediaType.APPLICATION_JSON_VALUE)
  public @ResponseBody BalanceSegmentSet getBalanceSegmentSet(
      @PathVariable("productidentifier") final String productIdentifier,
      @PathVariable("balancesegmentsetidentifier") final String balanceSegmentSetIdentifier) {
    return balanceSegmentSetService.findByIdentifier(productIdentifier, balanceSegmentSetIdentifier)
        .orElseThrow(() -> ServiceException.notFound(
            "Segment set with identifier ''{0}.{1}'' doesn''t exist.", productIdentifier, balanceSegmentSetIdentifier));
  }

  @Permittable(value = AcceptedTokenType.TENANT, groupId = PermittableGroupIds.PRODUCT_MANAGEMENT)
  @RequestMapping(
      value = "{balancesegmentsetidentifier}",
      method = RequestMethod.PUT,
      consumes = MediaType.ALL_VALUE,
      produces = MediaType.APPLICATION_JSON_VALUE)
  public @ResponseBody ResponseEntity<Void>  changeBalanceSegmentSet(
      @PathVariable("productidentifier") final String productIdentifier,
      @PathVariable("balancesegmentsetidentifier") final String balanceSegmentSetIdentifier,
      @RequestBody @Valid BalanceSegmentSet balanceSegmentSet) {
    checkThatProductAndBalanceSegmentSetExist(productIdentifier, balanceSegmentSetIdentifier);
    checkProductChangeable(productIdentifier);

    if (!balanceSegmentSetIdentifier.equals(balanceSegmentSet.getIdentifier()))
      throw ServiceException.badRequest("Instance identifier may not be changed.");

    this.commandGateway.process(new ChangeBalanceSegmentSetCommand(productIdentifier, balanceSegmentSet));
    return new ResponseEntity<>(HttpStatus.ACCEPTED);
  }

  @Permittable(value = AcceptedTokenType.TENANT, groupId = PermittableGroupIds.PRODUCT_MANAGEMENT)
  @RequestMapping(
      value = "{balancesegmentsetidentifier}",
      method = RequestMethod.DELETE,
      consumes = MediaType.ALL_VALUE,
      produces = MediaType.APPLICATION_JSON_VALUE
  )
  public @ResponseBody ResponseEntity<Void>  deleteBalanceSegmentSet(
      @PathVariable("productidentifier") final String productIdentifier,
      @PathVariable("balancesegmentsetidentifier") final String balanceSegmentSetIdentifier) {
    checkThatProductAndBalanceSegmentSetExist(productIdentifier, balanceSegmentSetIdentifier);
    checkProductChangeable(productIdentifier);

    this.commandGateway.process(new DeleteBalanceSegmentSetCommand(productIdentifier, balanceSegmentSetIdentifier));
    return new ResponseEntity<>(HttpStatus.ACCEPTED);
  }

  private void checkThatProductExists(final String productIdentifier) {
    if (!productService.existsByIdentifier(productIdentifier))
      throw ServiceException.notFound("Product with identifier ''{0}'' doesn''t exist.", productIdentifier);
  }

  private void checkThatSegmentSetDoesntExist(final String productIdentifier, final String segmentSetIdentifier) {
    if (balanceSegmentSetService.existsByIdentifier(productIdentifier, segmentSetIdentifier))
      throw ServiceException.notFound("Segment set with identifier ''{0}.{1}'' already exists.", productIdentifier, segmentSetIdentifier);
  }

  private void checkThatProductAndBalanceSegmentSetExist(final String productIdentifier, final String segmentSetIdentifier) {
    if (!balanceSegmentSetService.existsByIdentifier(productIdentifier, segmentSetIdentifier))
      throw ServiceException.notFound("Segment set with identifier ''{0}.{1}'' doesn''t exist.", productIdentifier, segmentSetIdentifier);
  }

  private void checkProductChangeable(final String productIdentifier) {
    if (caseService.existsByProductIdentifier(productIdentifier))
      throw ServiceException.conflict("Cases exist for product with the identifier ''{0}''. Product cannot be changed.", productIdentifier);
  }
}