package v2

import (
	"context"
	"fmt"

	"forge.cadoles.com/cadoles/go-emlid/reach/client/protocol"
	"forge.cadoles.com/cadoles/go-emlid/reach/client/protocol/v2/api"
	"forge.cadoles.com/cadoles/go-emlid/reach/client/protocol/v2/http"
	"github.com/Masterminds/semver/v3"
	"github.com/pkg/errors"
)

const Identifier protocol.Identifier = "v2"

const compatibleVersionConstraint = ">= 32"

type Protocol struct {
}

// Available implements protocol.Protocol.
func (p *Protocol) Available(ctx context.Context, addr string) (protocol.Operations, error) {
	url := fmt.Sprintf("http://%s/info", addr)

	info := api.Info{}
	if err := http.GetJSON(url, &info); err != nil {
		return nil, errors.WithStack(err)
	}

	versionConstraint, err := semver.NewConstraint(compatibleVersionConstraint)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	version, err := semver.NewVersion(info.Reachview.Version)
	if err != nil {
		return nil, errors.WithStack(err)
	}

	if !versionConstraint.Check(version) {
		return nil, errors.Errorf("reachview version '%s' does not match constraint '%s'", info.Reachview.Version, compatibleVersionConstraint)
	}

	return &Operations{addr: addr}, nil
}

// Identifier implements protocol.Protocol.
func (p *Protocol) Identifier() protocol.Identifier {
	return Identifier
}

// Operations implements protocol.Protocol.
func (p *Protocol) Operations(addr string) protocol.Operations {
	return &Operations{addr: addr}
}

var _ protocol.Protocol = &Protocol{}