package me.srvstr.rest;

import java.util.HashMap;
import java.util.Map;

import org.springframework.http.HttpStatus;
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.RequestBody;
import org.springframework.web.bind.annotation.RestController;

import com.google.gson.Gson;
import com.google.gson.JsonSyntaxException;

import me.srvstr.rest.model.Student;

@RestController
public class Controller {

  private static Map<Integer, Student> students = new HashMap<Integer, Student>();

  @GetMapping("/api/v0/hello-world")
  public String HelloWorld() {
    return "Hello, World!";
  }

  @GetMapping("/api/v0/student")
  public String getSomeStudent() {
    return new Gson().toJson(new Student(1, "Klaus Peter", 123456));
  }

  @GetMapping("/api/v1/students")
  public String getStudents() {
    return new Gson().toJson(students);
  }

  @PostMapping("/api/v1/student")
  public ResponseEntity<String> createStudent(@RequestBody String body) {

    try {

      Student student = new Gson().fromJson(body, Student.class);

      students.put(student.getId(), student);

    } catch (JsonSyntaxException e) {
      return new ResponseEntity<String>(e.getMessage(), HttpStatus.BAD_REQUEST);
    }

    return ResponseEntity.ok("Student created.");
  }

  @GetMapping("/api/v1/student/{id}")
  public ResponseEntity<String> getStudent(@PathVariable(name = "id") String id) {
    Student student = students.get(Integer.parseInt(id));

    if (null == student) {
      return new ResponseEntity<String>("Student not found", HttpStatus.NOT_FOUND);
    } else {
      return ResponseEntity.ok(new Gson().toJson(student));
    }
  }
}