package br.com.alura.forum.controller;

import java.net.URI;
import java.util.List;

import javax.validation.Valid;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.http.ResponseEntity;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.util.UriComponentsBuilder;
import org.springframework.transaction.annotation.Transactional;


import br.com.alura.forum.controller.dto.DetalhesDoTopicoDto;
import br.com.alura.forum.controller.dto.TopicoDto;
import br.com.alura.forum.controller.form.AtualizacaoTopicoForm;
import br.com.alura.forum.controller.form.TopicoForm;
import br.com.alura.forum.modelo.Topico;
import br.com.alura.forum.repository.CursoRepository;
import br.com.alura.forum.repository.TopicoRepository;

@RestController 
@RequestMapping("/topicos")  
public class TopicosController {

    @Autowired
    private TopicoRepository topicoRepository;

    @Autowired
    private CursoRepository cursoRepository;

    @GetMapping
    public List<TopicoDto> lista(String nomeCurso) {
        if (nomeCurso == null) {
            List<Topico> topicos = topicoRepository.findAll();
            return TopicoDto.converter(topicos);
        } else {
            List<Topico> topicos = topicoRepository.findByCursoNome(nomeCurso);
            return TopicoDto.converter(topicos);
    }
}
    @PostMapping
    public ResponseEntity<TopicoDto> cadastrar(@RequestBody @Valid TopicoForm form, UriComponentsBuilder uriBuilder){


        Topico topico  = form.converter(cursoRepository);
        topicoRepository.save(topico);

        URI uri = uriBuilder.path("/topicos/{id}").buildAndExpand(topico.getId()).toUri();
        return ResponseEntity.created(uri).body(new TopicoDto(topico));    
    }

    @GetMapping ("/{id}")
    @Transactional
    public DetalhesDoTopicoDto detalhar (@PathVariable Long id) {
        Topico topico = topicoRepository.getOne(id);
        return new DetalhesDoTopicoDto(topico);
    }
    @PutMapping("/{id}")
    public ResponseEntity<TopicoDto> atualizar (@PathVariable Long id, @RequestBody @Valid AtualizacaoTopicoForm form){
         Topico topico = form.atualizar(id, topicoRepository); 

         return ResponseEntity.ok(new TopicoDto(topico));
    }

 }