/*
Copyright 2021 The KubeVela Authors.

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.
*/

package utils

import (
	"bytes"
	"net"
	"net/http"
	"strings"
)

// ClientIP get client ip
func ClientIP(r *http.Request) string {
	xForwardedFor := r.Header.Get("X-Forwarded-For")
	ip := strings.TrimSpace(strings.Split(xForwardedFor, ",")[0])
	if ip != "" {
		return ip
	}

	ip = strings.TrimSpace(r.Header.Get("X-Real-Ip"))
	if ip != "" {
		return ip
	}

	if ip, _, err := net.SplitHostPort(strings.TrimSpace(r.RemoteAddr)); err == nil {
		return ip
	}

	return ""
}

// ResponseCapture capture response and get response info
type ResponseCapture struct {
	http.ResponseWriter
	wroteHeader bool
	status      int
	body        *bytes.Buffer
}

// NewResponseCapture new response capture
func NewResponseCapture(w http.ResponseWriter) *ResponseCapture {
	return &ResponseCapture{
		ResponseWriter: w,
		wroteHeader:    false,
		body:           new(bytes.Buffer),
	}
}

// Header return response writer header
func (c ResponseCapture) Header() http.Header {
	return c.ResponseWriter.Header()
}

// Write write data to response writer and body
func (c ResponseCapture) Write(data []byte) (int, error) {
	if !c.wroteHeader {
		c.WriteHeader(http.StatusOK)
	}
	c.body.Write(data)
	return c.ResponseWriter.Write(data)
}

// WriteHeader write header to response writer
func (c *ResponseCapture) WriteHeader(statusCode int) {
	c.status = statusCode
	c.wroteHeader = true
	c.ResponseWriter.WriteHeader(statusCode)
}

// Bytes return response body bytes
func (c ResponseCapture) Bytes() []byte {
	return c.body.Bytes()
}

// StatusCode return status code
func (c ResponseCapture) StatusCode() int {
	return c.status
}