package request

import (
	"fmt"
	"git.xdrm.io/go/websocket/internal/http/upgrade/request/parser/header"
	"git.xdrm.io/go/websocket/internal/http/upgrade/response"
)

// parseHeader parses any http request line
// (header and request-line)
func (r *T) parseHeader(b []byte) error {

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

		err := r.request.Parse(b)

		if err != nil {
			r.code = response.BAD_REQUEST
			return &InvalidRequest{"Request-Line", err.Error()}
		}

		r.first = true
		return nil

	}

	/* (2) Other lines -> Header-Name: Header-Value
	---------------------------------------------------------*/
	/* (1) Try to parse header */
	head, err := header.Parse(b)
	if err != nil {
		r.code = response.BAD_REQUEST
		return fmt.Errorf("Error parsing header: %s", err)
	}

	/* (2) Manage header */
	switch head.Name {
	case header.HOST:
		err = r.extractHostPort(head.Values)
	case header.ORIGIN:
		err = r.extractOrigin(head.Values)
	case header.UPGRADE:
		err = r.checkUpgrade(head.Values)
	case header.CONNECTION:
		err = r.checkConnection(head.Values)
	case header.WSVERSION:
		err = r.checkVersion(head.Values)
	case header.WSKEY:
		err = r.extractKey(head.Values)
	case header.WSPROTOCOL:
		err = r.extractProtocols(head.Values)

	default:
		return nil
	}

	// dispatch error
	if err != nil {
		return err
	}

	return nil

}

// isComplete returns whether the Upgrade Request
// is complete (no missing required item)
func (r T) isComplete() error {

	/* (1) Request-Line */
	if !r.first {
		return &IncompleteRequest{"Request-Line"}
	}

	/* (2) Host */
	if len(r.host) == 0 {
		return &IncompleteRequest{"Host"}
	}

	/* (3) Origin */
	if !bypassOriginPolicy && len(r.origin) == 0 {
		return &IncompleteRequest{"Origin"}
	}

	/* (4) Connection */
	if !r.hasConnection {
		return &IncompleteRequest{"Connection"}
	}

	/* (5) Upgrade */
	if !r.hasUpgrade {
		return &IncompleteRequest{"Upgrade"}
	}

	/* (6) Sec-WebSocket-Version */
	if !r.hasVersion {
		return &IncompleteRequest{"Sec-WebSocket-Version"}
	}

	/* (7) Sec-WebSocket-Key */
	if len(r.key) < 1 {
		return &IncompleteRequest{"Sec-WebSocket-Key"}
	}

	return nil

}