package addon

import (
	"bytes"
	"fmt"
	"io"
	"net/http"
	"os"
	"strings"
	"unicode"

	"github.com/lqqyt2423/go-mitmproxy/flow"
)

type Dumper struct {
	Base
	level int // 0: header 1: header + body
	Out   io.Writer
}

func NewDumper(file string, level int) *Dumper {
	out, err := os.OpenFile(file, os.O_WRONLY|os.O_CREATE|os.O_APPEND, 0666)
	if err != nil {
		panic(err)
	}

	if level != 0 && level != 1 {
		level = 0
	}

	return &Dumper{Out: out, level: level}
}

func (d *Dumper) Requestheaders(f *flow.Flow) {
	log := log.WithField("in", "Dumper")

	go func() {
		<-f.Done()

		// 参考 httputil.DumpRequest

		buf := bytes.NewBuffer(make([]byte, 0))
		fmt.Fprintf(buf, "%s %s %s\r\n", f.Request.Method, f.Request.URL.RequestURI(), f.Request.Proto)
		fmt.Fprintf(buf, "Host: %s\r\n", f.Request.URL.Host)
		if len(f.Request.Raw().TransferEncoding) > 0 {
			fmt.Fprintf(buf, "Transfer-Encoding: %s\r\n", strings.Join(f.Request.Raw().TransferEncoding, ","))
		}
		if f.Request.Raw().Close {
			fmt.Fprintf(buf, "Connection: close\r\n")
		}

		err := f.Request.Header.WriteSubset(buf, nil)
		if err != nil {
			log.Error(err)
		}
		buf.WriteString("\r\n")

		if d.level == 1 && f.Request.Body != nil && len(f.Request.Body) > 0 && CanPrint(f.Request.Body) {
			buf.Write(f.Request.Body)
			buf.WriteString("\r\n\r\n")
		}

		if f.Response != nil {
			fmt.Fprintf(buf, "%v %v %v\r\n", f.Request.Proto, f.Response.StatusCode, http.StatusText(f.Response.StatusCode))
			err = f.Response.Header.WriteSubset(buf, nil)
			if err != nil {
				log.Error(err)
			}
			buf.WriteString("\r\n")

			if d.level == 1 && f.Response.Body != nil && len(f.Response.Body) > 0 {
				body, _ := f.Response.DecodedBody()
				if len(body) > 0 && CanPrint(body) {
					buf.Write(body)
					buf.WriteString("\r\n\r\n")
				}
			}
		}

		buf.WriteString("\r\n\r\n")

		_, err = d.Out.Write(buf.Bytes())
		if err != nil {
			log.Error(err)
		}
	}()
}

func CanPrint(content []byte) bool {
	for _, c := range string(content) {
		if !unicode.IsPrint(c) && !unicode.IsSpace(c) {
			return false
		}
	}
	return true
}