package jttp

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

type Client struct {
	c *http.Client
}

func NewClient(c *http.Client) *Client {
	return &Client{c}
}

// Do sends an HTTP request, checks that the response status code matches
// wantStatus, and decodes the JSON response body into resp.
//
// An error is returned if the HTTP request fails, the response status
// code does not equal wantStatus, or the JSON decoding fails.
func (c *Client) Do(req *http.Request, wantStatus int, resp any) error {
	hresp, err := c.c.Do(req)
	if err != nil {
		return err
	}
	defer hresp.Body.Close()
	if hresp.StatusCode != wantStatus {
		return fmt.Errorf("jttp: %s %s: %s (expected %d)",
			req.Method, req.URL, hresp.Status, wantStatus)
	}
	dec := json.NewDecoder(hresp.Body)
	return dec.Decode(resp)
}