// TODO: READ AND UNDERSTAND + ALTER

package main

import (
	"context"
	"encoding/json"
	"net/http"
)

// GET /users
func getUsers(w http.ResponseWriter, r *http.Request) {
	rows, err := db.Query(context.Background(), "SELECT id, name FROM users")
	if err != nil {
		http.Error(w, err.Error(), 500)
		return
	}
	defer rows.Close()

	var users []User

	for rows.Next() {
		var u User
		rows.Scan(&u.ID, &u.Name)
		users = append(users, u)
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(users)
}

// POST /users
func createUser(w http.ResponseWriter, r *http.Request) {
	var u User

	err := json.NewDecoder(r.Body).Decode(&u)
	if err != nil {
		http.Error(w, "Invalid JSON", 400)
		return
	}

	err = db.QueryRow(
		context.Background(),
		"INSERT INTO users(name) VALUES($1) RETURNING id",
		u.Name,
	).Scan(&u.ID)

	if err != nil {
		http.Error(w, err.Error(), 500)
		return
	}

	w.Header().Set("Content-Type", "application/json")
	json.NewEncoder(w).Encode(u)
}