/*
	Copyright 2022 Dolysis Consulting Limited

	Licensed under the Apache License, Version 2.0 (the "License");
	you may not use this file except in compliance with the License.
	You may obtain a copy of the License at
		http://www.apache.org/licenses/LICENSE-2.0
	Unless required by applicable law or agreed to in writing, software
	distributed under the License is distributed on an "AS IS" BASIS,
	WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	See the License for the specific language governing permissions and
	limitations under the License.

	For changes see the git log
*/
package ipp

import (
	"bytes"
	"crypto/tls"
	"fmt"
	"io"
	"net"
	"net/http"
	"strconv"
)

type HttpAdapter struct {
	host     string
	port     int
	username string
	password string
	useTLS   bool
	client   *http.Client
}

func NewHttpAdapter(host string, port int, username, password string, useTLS bool) *HttpAdapter {
	httpClient := http.Client{
		Transport: &http.Transport{
			TLSClientConfig: &tls.Config{
				InsecureSkipVerify: true,
			},
		},
	}

	return &HttpAdapter{
		host:     host,
		port:     port,
		username: username,
		password: password,
		useTLS:   useTLS,
		client:   &httpClient,
	}
}

func (h *HttpAdapter) SendRequest(url string, req *Request, additionalResponseData io.Writer) (*Response, error) {
	payload, err := req.Encode()
	if err != nil {
		return nil, err
	}

	var body io.Reader
	size := len(payload)

	if req.File != nil && req.FileSize != -1 {
		size += req.FileSize

		body = io.MultiReader(bytes.NewBuffer(payload), req.File)
	} else {
		body = bytes.NewBuffer(payload)
	}

	httpReq, err := http.NewRequest("POST", url, body)
	if err != nil {
		return nil, err
	}

	httpReq.Header.Set("Content-Length", strconv.Itoa(size))
	httpReq.Header.Set("Content-Type", ContentTypeIPP)

	if h.username != "" && h.password != "" {
		httpReq.SetBasicAuth(h.username, h.password)
	}

	httpResp, err := h.client.Do(httpReq)
	if err != nil {
		return nil, err
	}
	defer httpResp.Body.Close()

	if httpResp.StatusCode != 200 {
		return nil, HTTPError{
			Code: httpResp.StatusCode,
		}
	}

	resp, err := NewResponseDecoder(httpResp.Body).Decode(additionalResponseData)
	if err != nil {
		return nil, err
	}

	err = resp.CheckForErrors()
	return resp, err
}

func (h *HttpAdapter) GetHttpUri(namespace string, object interface{}) string {
	proto := "http"
	if h.useTLS {
		proto = "https"
	}

	uri := fmt.Sprintf("%s://%s:%d", proto, h.host, h.port)

	if namespace != "" {
		uri = fmt.Sprintf("%s/%s", uri, namespace)
	}

	if object != nil {
		uri = fmt.Sprintf("%s/%v", uri, object)
	}

	return uri
}

func (h *HttpAdapter) TestConnection() error {
	conn, err := net.Dial("tcp", fmt.Sprintf("%s:%d", h.host, h.port))
	if err != nil {
		return err
	}
	conn.Close()

	return nil
}