const express = require("express");
const app = express();

app.use(express.json());

const persons = [
  {
    id: "1",
    name: "Arto Hellas",
    number: "040-123456",
  },
  {
    id: "2",
    name: "Ada Lovelace",
    number: "39-44-5323523",
  },
  {
    id: "3",
    name: "Dan Abramov",
    number: "12-43-234345",
  },
  {
    id: "4",
    name: "Mary Poppendieck",
    number: "39-23-6423122",
  },
];

app.get("/api/persons", (request, response) => {
  response.json(persons);
});

app.get("/api/persons/:id", (request, response) => {
  const requestedId = Number(request.params.id);

  const requestedPerson = persons.find(
    (person) => Number(person.id) === requestedId
  );

  if (!requestedPerson) {
    return response.status(404).json({
      error: "ID not found.",
    });
  }

  if (requestedPerson) {
    return response.json(requestedPerson);
  }
});

app.post("/api/persons/", (request, response) => {
  if (!request.body.name || !request.body.number) {
    return response.status(400).json({
      success: false,
      message: "Malformed body.",
    });
  }

  const nameIsInPhonebook = persons.find(
    (person) => person.name == request.body.name
  );

  if (nameIsInPhonebook) {
    return response.status(409).json({
      success: false,
      message: "Name already in phonebook.",
    });
  }

  const newId = Math.floor(Math.random() * 100_000_000 * 21);

  const personData = {
    id: newId,
    name: request.body.name,
    number: request.body.number,
  };

  persons.push(personData);

  return response.status(201).json(personData);
});

app.delete("/api/persons/:id", (request, response) => {
  const idToDelete = request.params.id;

  const requestedPersonIndex = persons.findIndex((person) => {
    console.log(`Person ID: ${person.id}`);
    console.log(`ID to delete: ${idToDelete}`);
    console.log(`Do they match? ${person.id === idToDelete}`);

    return person.id === idToDelete;
  });

  console.log(requestedPersonIndex);

  if (requestedPersonIndex !== -1) {
    persons.splice(requestedPersonIndex, 1);
    return response.status(204).json({ success: true });
  }

  if (requestedPersonIndex === -1) {
    return response
      .status(404)
      .json({ success: true, message: "id not found" });
  }
});

app.get("/info", (request, response) => {
  let responseString = `<p>Phonebook has info for ${persons.length} people</p>`;
  responseString += `<p>${new Date().toString()}</p>`;
  const id = request.params.id;
  response.send(responseString);
});

const PORT = 3001;
app.listen(PORT, () => {
  console.log(`Server running on port ${PORT}`);
});