package auth

import (
	"net/http"

	"forge.cadoles.com/arcad/edge/pkg/app"
	edgeHTTP "forge.cadoles.com/arcad/edge/pkg/http"
	"forge.cadoles.com/arcad/edge/pkg/module/util"
	"github.com/dop251/goja"
	"github.com/pkg/errors"
	"gitlab.com/wpetit/goweb/logger"
)

const (
	ClaimSubject           = "sub"
	ClaimIssuer            = "iss"
	ClaimPreferredUsername = "preferred_username"
	ClaimEdgeRole          = "edge_role"
	ClaimEdgeTenant        = "edge_tenant"
	ClaimEdgeEntrypoint    = "edge_entrypoint"
)

type Module struct {
	server    *app.Server
	getClaims GetClaimsFunc
}

func (m *Module) Name() string {
	return "auth"
}

func (m *Module) Export(export *goja.Object) {
	if err := export.Set("getClaim", m.getClaim); err != nil {
		panic(errors.Wrap(err, "could not set 'getClaim' function"))
	}

	if err := export.Set("CLAIM_SUBJECT", ClaimSubject); err != nil {
		panic(errors.Wrap(err, "could not set 'CLAIM_SUBJECT' property"))
	}

	if err := export.Set("CLAIM_TENANT", ClaimEdgeTenant); err != nil {
		panic(errors.Wrap(err, "could not set 'CLAIM_TENANT' property"))
	}

	if err := export.Set("CLAIM_ENTRYPOINT", ClaimEdgeEntrypoint); err != nil {
		panic(errors.Wrap(err, "could not set 'CLAIM_ENTRYPOINT' property"))
	}

	if err := export.Set("CLAIM_ROLE", ClaimEdgeRole); err != nil {
		panic(errors.Wrap(err, "could not set 'CLAIM_ROLE' property"))
	}

	if err := export.Set("CLAIM_PREFERRED_USERNAME", ClaimPreferredUsername); err != nil {
		panic(errors.Wrap(err, "could not set 'CLAIM_PREFERRED_USERNAME' property"))
	}
}

func (m *Module) getClaim(call goja.FunctionCall, rt *goja.Runtime) goja.Value {
	ctx := util.AssertContext(call.Argument(0), rt)
	claimName := util.AssertString(call.Argument(1), rt)

	req, ok := ctx.Value(edgeHTTP.ContextKeyOriginRequest).(*http.Request)
	if !ok {
		panic(rt.ToValue(errors.New("could not find http request in context")))
	}

	claim, err := m.getClaims(ctx, req, claimName)
	if err != nil {
		if errors.Is(err, ErrUnauthenticated) {
			return nil
		}

		logger.Error(ctx, "could not retrieve claim", logger.E(errors.WithStack(err)))
		return nil
	}

	if len(claim) == 0 || claim[0] == "" {
		return nil
	}

	return rt.ToValue(claim[0])
}

func ModuleFactory(funcs ...OptionFunc) app.ServerModuleFactory {
	opt := defaultOptions()
	for _, fn := range funcs {
		fn(opt)
	}

	return func(server *app.Server) app.ServerModule {
		return &Module{
			server:    server,
			getClaims: opt.GetClaims,
		}
	}
}