rnm_client.go

// client.go
package rickandmorty

import (
	"encoding/json"
	"fmt"
	"io/ioutil"
	"net/http"
)

// APIError represents an 4xx error from the API.
type APIError struct {
	Err string `json:"error"`
}

func (e *APIError) Error() string {
	return e.Err
}

func NewClient(baseURL string) *Client {
	return &Client{
		client:  &http.Client{},
		baseURL: baseURL,
	}
}

type Client struct {
	client  *http.Client
	baseURL string
}

type Character struct {
	ID      int    `json:"id"`
	Name    string `json:"name"`
	Status  string `json:"status"`
	Species string `json:"species"`
	Type    string `json:"type"`
	Gender  string `json:"gender"`
	Image   string `json:"image"`
	URL     string `json:"url"`
	Created string `json:"created"`
}

// GetCharacter returns a character by ID.
func (c *Client) GetCharacter(id int) (*Character, error) {
	req, err := http.NewRequest(http.MethodGet, fmt.Sprintf("%s/character/%d", c.baseURL, id), nil)
	if err != nil {
		return nil, fmt.Errorf("error creating request: %w", err)
	}
	req.Header.Set("Accept", "application/json")
	req.Header.Set("Content-Type", "application/json")

	var character Character
	if err := c.makeRequest(req, &character); err != nil {
		return nil, err
	}

	return &character, nil
}

// makeRequest makes a request to the API and unmarshals the response into the given interface.
func (c *Client) makeRequest(r *http.Request, v interface{}) error {
	resp, err := c.client.Do(r)
	if err != nil {
		return err
	}
	defer resp.Body.Close()

	data, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		return fmt.Errorf("error reading response body: %w", err)
	}

	switch status := resp.StatusCode; {
	case status >= 200 && status < 300: // 2xx
		if err := json.Unmarshal(data, v); err != nil {
			return fmt.Errorf("error unmarshalling response: %w", err)
		}
		return nil
	case status >= 400 && status < 500: // 4xx
		var apiError APIError
		if err := json.Unmarshal(data, &apiError); err != nil {
			return fmt.Errorf("error unmarshalling response: %w", err)
		}
		return &apiError
	default: // 5xx
		return fmt.Errorf("error response: %s", string(data))
	}
}