// If you want to create an executable binary,
// you must name your package `main`.
// By using another name, you create a library.
package main

// Import external modules that you would like to use
import (
	"encoding/json" // JSON encoding and decoding
	"fmt"           // Formatting
	"io"            // Input/Output
	"net/http"      // HTTP requests
	"os"            // Operating System
)

type joke struct {
	Type string
	// The json key can be overridden
	Message string `json:"setup"`
}

// The main function is called when executing the binary
func main() {
	// Variables are declared using `:=`
	// The type is automatically evaluated and cannot be modified
	url := "https://official-joke-api.appspot.com/random_joke"
	// The following will not work:
	// url = 9

	// Output a string to the terminal
	// %v detects the variable type. You may also use %s for strings and %d for digits
	fmt.Printf("Requesting joke from %v\n", url)
	// The following would also work:
	// fmt.Println("Requesting joke from", url)

	// Functions can return multiple results!
	// The variable names can be freely modified,
	// but using `err` for the error result is a convention.
	res, err := http.Get(url)
	// If the error is not nil, it means an error has occurred
	if err != nil {
		fmt.Printf("Error making http request: %v\n", err)
		// Exit the program with statuscode 1
		os.Exit(1)
	}
	body, err := io.ReadAll(res.Body)
	if err != nil {
		fmt.Printf("Error reading response body: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("Body: %s\n", body)

	// Initialize a new instance of the joke struct
	j := joke{}
	// Pass a pointer of j to json.Unmarshal
	err = json.Unmarshal(body, &j)
	if err != nil {
		fmt.Printf("Error decoding body: %v\n", err)
		os.Exit(1)
	}
	fmt.Printf("%+v", j)
}