package request

import (
	"strconv"
	"fmt"
	"strings"
)


func (r *T) parseHeader(b []byte) {

	/* (1) First line -> GET {uri} HTTP/{version}
	---------------------------------------------------------*/
	if !r.first {

		/* (1) Split by ' ' */
		parts := strings.Split(string(b), " ")

		/* (2) Abort on failure */
		if len(parts) != 3 {
			return
		}

		/* (3) Store method */
		r.httpMethod = parts[0]

		/* (4) Store URI */
		r.uri = parts[1]

		/* (5) Fail if wrong version format */
		if len(parts[2]) < len("HTTP/0") {
			r.Err = fmt.Errorf("Invalid HTTP version [%s] expected [HTTP/] prefix")
			return
		}

		/* (6) Extract version part */
		versionString := parts[2][len("HTTP/"):]
		version, err := strconv.ParseFloat(versionString, 32)

		if err != nil {
			r.Err = fmt.Errorf("Cannot parse HTTP version as float")
			return
		}

		/* (7) Store HTTP version */
		r.httpVersion = float32(version)


		r.first = true
		return

	}


	/* (2) Other lines -> Header-Name: Header-Value
	---------------------------------------------------------*/

	/* (1) Split by ': ' */
	parts := strings.Split(string(b), ": ")

	/* (2) Abort on failure */
	if len(parts) != 2 {
		return
	}

	/* (3) Match header */
	switch strings.ToLower(parts[0]) {
		case "host":                   fmt.Printf("[host]                   '%s'\n", parts[1])
		case "upgrade":                fmt.Printf("[upgrade]                '%s'\n", parts[1])
		case "connection":             fmt.Printf("[connection]             '%s'\n", parts[1])
		case "sec-websocket-key":      fmt.Printf("[sec-websocket-key]      '%s'\n", parts[1])
		case "origin":                 fmt.Printf("[origin]                 '%s'\n", parts[1])
		case "sec-websocket-protocol": fmt.Printf("[sec-websocket-protocol] '%s'\n", parts[1])
		case "sec-websocket-version":  fmt.Printf("[sec-websocket-version]  '%s'\n", parts[1])

	}

}