package com.srh.api.controller;

import com.srh.api.algorithms.structure.RecommendationsByUser;
import com.srh.api.dto.resource.RecommendationDto;
import com.srh.api.dto.resource.RecommendationForm;
import com.srh.api.dto.resource.RecommendationUserDto;
import com.srh.api.hypermedia.RecommendationModelAssembler;
import com.srh.api.model.Recommendation;
import com.srh.api.service.RecommendationService;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.domain.Page;
import org.springframework.data.domain.Pageable;
import org.springframework.data.web.PageableDefault;
import org.springframework.data.web.PagedResourcesAssembler;
import org.springframework.hateoas.EntityModel;
import org.springframework.hateoas.PagedModel;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.*;

import javax.transaction.Transactional;
import javax.validation.Valid;

import java.util.ArrayList;
import java.util.List;

import static com.srh.api.dto.resource.RecommendationDto.convert;

@RestController
@RequestMapping("/recommendations")
public class RecommendationController {
    @Autowired
    private RecommendationService recommendationService;

    @Autowired
    private RecommendationModelAssembler recommendationModelAssembler;

    @Autowired
    private PagedResourcesAssembler<RecommendationDto> pagedResourcesAssembler;

    @GetMapping
    public PagedModel<EntityModel<RecommendationDto>> listAll(@PageableDefault(page = 0, size = 5)
                                                                      Pageable pageInfo) {
        Page<Recommendation> recommendations = recommendationService.findAll(pageInfo);
        return pagedResourcesAssembler.toModel(convert(recommendations));
    }

    @GetMapping("/{id}")
    public EntityModel<RecommendationDto> find(@PathVariable Integer id) {
        Recommendation recommendation = recommendationService.find(id);
        return recommendationModelAssembler.toModel(new RecommendationDto(recommendation));
    }

    @PostMapping
    public ResponseEntity<List<RecommendationUserDto>> generateRecommendations(
            @RequestBody @Valid RecommendationForm form) {
        List<RecommendationsByUser> recommendations = recommendationService.generateRecommendation(form);
        List<RecommendationUserDto> recommendationUserDtos = new ArrayList<>();

        for (RecommendationsByUser recommendationByUser : recommendations) {
            recommendationUserDtos.add(new RecommendationUserDto(recommendationByUser));
        }

        return ResponseEntity.ok(recommendationUserDtos);
    }

    @DeleteMapping("/{id}")
    @Transactional
    public ResponseEntity<Void> delete(@PathVariable Integer id) {
        recommendationService.delete(id);
        return ResponseEntity.noContent().build();
    }

}