// Copyright (c) 2026 Probo Inc <hello@probo.com>.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.

package provider

import (
	"context"
	"fmt"
	"net/http"

	"go.gearno.de/kit/log"
	"go.probo.inc/probo/pkg/accessreview/drivers"
	"go.probo.inc/probo/pkg/connector"
	"go.probo.inc/probo/pkg/coredata"
)

// oktaRegistration wires the Okta access-review connector. Okta is a
// per-tenant IdP with no central API gateway, so a one-click OAuth flow is not
// possible — it authenticates with a read-only API token presented under the
// `SSWS` Authorization scheme (APIKeyAuthScheme), plus the customer's org
// domain. The token + domain identify exactly one org, so there is no picker
// and no OAuth metadata. BuildProbeURL targets the org's own API host.
func oktaRegistration() *Registration {
	return &Registration{
		Provider:         coredata.ConnectorProviderOkta,
		DisplayName:      "Okta",
		DocumentationURL: accessReviewDocsURL("okta"),
		SupportsAPIKey:   true,
		APIKeyAuthScheme: "SSWS",
		BuildProbeURL:    buildOktaProbeURL,
		APIKeyExtraSettings: []ExtraSetting{
			{Key: "domain", Label: "Okta Domain", Required: true},
		},
		NewDriver: func(_ context.Context, c *http.Client, conn *coredata.Connector, _ *log.Logger) (drivers.Driver, error) {
			s, err := coredata.ConnectorSettings[coredata.OktaConnectorSettings](conn)
			if err != nil {
				return nil, fmt.Errorf("cannot read okta connector settings: %w", err)
			}

			// Re-validate the stored domain at the construction site
			// (defense-in-depth): the create-connector resolver validates on
			// write, but pinning the host invariant here keeps the driver safe
			// regardless of how the connector row was populated. An empty
			// domain also fails this check.
			if !connector.IsValidOktaDomain(s.Domain) {
				return nil, fmt.Errorf("cannot create okta driver: invalid or missing domain")
			}

			return drivers.NewOktaDriver(c, s.Domain), nil
		},
		NewNameResolver: func(ctx context.Context, c *http.Client, conn *coredata.Connector, logger *log.Logger) drivers.NameResolver {
			s, err := coredata.ConnectorSettings[coredata.OktaConnectorSettings](conn)
			if err != nil {
				logger.ErrorCtx(ctx, "cannot read okta connector settings", log.Error(err))
				return nil
			}

			if !connector.IsValidOktaDomain(s.Domain) {
				logger.ErrorCtx(ctx, "invalid okta domain in connector settings")
				return nil
			}

			return drivers.NewOktaNameResolver(c, s.Domain)
		},
	}
}