package api

import "encoding/json"
import "net/http"
import "net/url"
import "errors"
import "bytes"
import "fmt"
import "io"

type RequestOptions struct {
	Method string
	Body interface{}
	Headers map[string]string
}

func (client *Client) doRawRequest(
	u *url.URL,
	params RequestOptions,
	result interface{},
) error {
	var (
		err error
	)

	reqBody := new(bytes.Buffer)
	if params.Body != nil {
		encoder := json.NewEncoder(reqBody)
		err := encoder.Encode(params.Body)
		if err != nil {
			return err
		}
	}

	request, err := http.NewRequest(
		params.Method,
		u.String(),
		reqBody,
	)
	if err != nil {
		return err
	}

	if params.Headers != nil {
		for k, v := range params.Headers {
			request.Header.Set(k, v)
		}
	}

	res, err := http.DefaultClient.Do(request)
	if client.Debug {
		client.Printf(
			"Request: %+v\n\nAmo response: %+v\n\n",
			request,
			res,
		)
	}
	if res == nil {
		if err != nil {
			return NewRequestError(err)
		}
		return NewRequestError(ErrUnreachable)
	}
	if err != nil {
		return NewRequestError(fmt.Errorf(
			"%w: %d %s %s",
			err,
			res.StatusCode,
			params.Method,
			u,
		))
	}
	defer res.Body.Close()

	if res.StatusCode == 204 {
		return NewRequestError(ErrNoContent)
	}

	if res.StatusCode >= 400 {
		var specErr error
		if res.StatusCode == 401 {
			specErr = ErrNoAuth
		}

		resErrInfo, _ := io.ReadAll(res.Body)
		return NewRequestError(fmt.Errorf(
			"%w: %s %s %q %d",
			specErr,
			params.Method,
			u,
			string(resErrInfo),
			res.StatusCode,
		))
	}

	if result != nil {
		decoder := json.NewDecoder(res.Body)
		err = decoder.Decode(result)
		if err != nil {
			return err
		}
	}

	return nil
}

func (client *Client) doRequest(
	u string,
	params RequestOptions,
	result any,
) error {
	var (
		err error
		parsedURL *url.URL
	)

	parsedURL, err = url.Parse(u)
	if err != nil {
		return err
	}
	reqURL := client.BaseURL.ResolveReference(parsedURL)

	err = client.doRawRequest(
		reqURL,
		params,
		result,
	)
	if errors.Is(err, ErrNoAuth) &&
			client.options.RefreshToken != "" {

		_, err = client.RefreshToken()
		if err != nil {
			return nil
		}

		return client.doRawRequest(
			reqURL,
			params,
			result,
		)

	} else if err != nil {
		return err
	}

	return nil
}

func makeHeaders(
	token string,
) map[string]string {
	headers := map[string]string{
		"Accept": DefaultAccept,
		"Cache-Control": DefaultCacheControl,
		"Content-Type": DefaultContentType,
	}

	if len(token) > 0 {
		headers["Authorization"] =
			fmt.Sprintf("Bearer %s", token)
	}

	return headers
}