package request

import (
	"git.xdrm.io/gws/http/upgrade/response"
	"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 Parse(r io.Reader) (request *T, err error) {

	req := new(T)
	req.code = 500


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

	/* (2) Parse header line by line */
	for {

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

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

		err = req.parseHeader(line)

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

	}

	/* (3) Check completion */
	err = req.isComplete()
	if err != nil {
		req.code = response.BAD_REQUEST
		return req, err
	}


	req.code = response.SWITCHING_PROTOCOLS
	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)
	l4 := fmt.Sprintf(" - current status: %d %s\n", r.code, r.code.Explicit())


	return fmt.Sprintf("%s%s%s%s", l1, l2, l3, l4)
}


// StatusCode returns the status current
func (r T) StatusCode() response.StatusCode {
	return r.code
}



// BuildResponse builds a response.T from the request
func (r *T) BuildResponse() *response.T{

	inst := new(response.T)

	/* (1) Copy code */
	inst.SetStatusCode(r.code)

	/* (2) Set Protocol */
	if len(r.protocols) > 0 {
		inst.SetProtocol(r.protocols[0])
	}

	/* (4) Process key */
	inst.ProcessKey(r.key)

	return inst
}