// Copyright (C) 2023 Marius Schellenberger

package client

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

type Error struct {
	Err  string `json:"error"`
	Code int    `json:"code"`
}

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

func (e Error) Is(target error) bool {
	return e.Err == target.Error()
}

type Redirect struct {
	Location string
	Code     int
}

func (r Redirect) Error() string {
	return "redirect: " + r.Location
}

var ErrRedirect = Redirect{}

func decodeResp(resp *http.Response, v any) error {
	if resp.Body == nil {
		return nil
	}
	defer resp.Body.Close()
	if resp.StatusCode == 200 {
		if v == nil {
			return nil
		}
		return json.NewDecoder(resp.Body).Decode(&v)
	}
	if resp.StatusCode >= 300 && resp.StatusCode < 400 {
		loc := resp.Header.Get("Location")
		return Redirect{loc, resp.StatusCode}
	}
	var e Error
	err := json.NewDecoder(resp.Body).Decode(&e)
	if err != nil {
		return err
	}
	if resp.StatusCode >= 400 && resp.StatusCode < 600 {
		return e
	}
	return nil
}