package request

import (
	"git.xdrm.io/gws/internal/http/reader"
	"fmt"
	"io"
)

// Parse builds an upgrade HTTP request
// from a reader (typically bufio.NewRead of the socket)
func Build(r io.Reader) (request *T, err error) {

	/* (1) Parse request
	---------------------------------------------------------*/
	/* (1) Get chunk reader */
	cr := reader.NewReader(r)
	if err != nil {
		return nil, fmt.Errorf("Error while creating chunk reader: %s", err)
	}

	/* (2) Init request */
	req := new(T)

	/* (3) Parse header line by line */
	for {

		line, err := cr.Read()
		if err == io.EOF {
			break
		}

		if err != nil {
			return nil, fmt.Errorf("Cannot read from reader: %s", err)
		}

		err = req.parseHeader(line)

		if err != nil {
			return nil, fmt.Errorf("Parsing error: %s\n", err);
		}

	}

	/* (4) Check completion */
	err = req.isComplete()
	if err != nil {
		return nil, err
	}


	return req, nil

}



// String returns a textual representation of the upgrade request
func (r T) String() string{

	l1 := fmt.Sprintf("Upgrade Request\n - host: %s\n - port: %d\n - origin: %s\n", r.host, r.port, r.origin)
	l2 := fmt.Sprintf(" - origin policy: %t\n - connection header: %t\n - upgrade header: %t\n - valid ws version: %t\n", r.validPolicy, r.hasConnection, r.hasUpgrade, r.hasVersion)
	l3 := fmt.Sprintf(" - key: %s\n - protocols: %s\n", r.key, r.protocols)


	return fmt.Sprintf("%s%s%s", l1, l2, l3)
}