// 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 console_v1

import (
	"context"
	"encoding/json"
	"errors"
	"fmt"
	"net/http"
	"net/url"
	"strings"

	"go.gearno.de/kit/log"
	"go.probo.inc/probo/pkg/accessreview/drivers"
	"go.probo.inc/probo/pkg/connector"
	"go.probo.inc/probo/pkg/coredata"
	"go.probo.inc/probo/pkg/server/api/console/v1/types"
	"go.probo.inc/probo/pkg/server/gqlutils"
)

// These helpers live outside connector_resolvers.go because that file is
// regenerated by gqlgen, which does not preserve standalone functions.

// resolveAPIKeyConnectorCredential returns the API key to persist on a new
// API-key connection. For ManagedAPIKey providers (Model B, e.g. Crisp) it
// persists NOTHING (empty string): the Probo-held key is injected fresh at
// use time by (*provider.Registry).ApplyManagedAPIKey, so it survives key
// rotation and is not duplicated across tenant rows. It still requires the
// key to be configured, which is what keeps the provider deactivated, and
// ignores any client-supplied value. For all other providers it requires
// the client-supplied key. The returned error is surfaced verbatim to the
// client via gqlutils.Invalid, so it contains only provider/field names,
// never the key itself.
func (r *Resolver) resolveAPIKeyConnectorCredential(provider coredata.ConnectorProvider, clientKey *string) (string, error) {
	if reg, ok := r.providerRegistry.Get(provider); ok && reg.ManagedAPIKey {
		if _, ok := r.providerRegistry.ManagedAPIKey(provider); !ok {
			return "", fmt.Errorf("connector is not configured for this deployment")
		}

		return "", nil
	}

	if clientKey == nil || *clientKey == "" {
		return "", fmt.Errorf("apiKey is required")
	}

	return *clientKey, nil
}

// newAPIKeyConnection builds an API-key connection for provider, filling the auth
// presentation (header, basic-auth mode, scheme) from the provider registry and
// using key as the credential. Both CreateAPIKeyConnector (the persisted
// connection) and verifyCrispOwnership (the ownership-check client) construct
// their connection through it, so the verification client authenticates exactly
// as the persisted connector will: a new auth flag cannot be added to one path
// and silently missed on the other.
func (r *Resolver) newAPIKeyConnection(provider coredata.ConnectorProvider, key string) *connector.APIKeyConnection {
	return &connector.APIKeyConnection{
		APIKey:            key,
		Header:            r.providerRegistry.APIKeyHeader(provider),
		BasicAuth:         r.providerRegistry.APIKeyUsesBasicAuth(provider),
		BasicAuthUserPass: r.providerRegistry.APIKeyUsesBasicAuthUserPass(provider),
		Scheme:            r.providerRegistry.APIKeyAuthScheme(provider),
	}
}

// crispSettingsFetcher reads a Crisp plugin's per-website subscription settings.
// It matches drivers.GetCrispSubscriptionSettings: verifyCrispOwnership injects
// the real fetch, and tests substitute a fake so the branch wiring (the security
// polarity and the Invalid-versus-Internal error mapping) is exercised without a
// live Crisp API.
type crispSettingsFetcher func(ctx context.Context, httpClient *http.Client, websiteID, pluginID string) (*drivers.CrispSubscriptionSettings, error)

// verifyCrispOwnership proves the connecting organization controls the Crisp
// website before a connection is created (the #1b ownership check). It reads the
// Probo plugin's per-website settings through the managed plugin token and
// requires probo_verification_code to equal the code Probo showed for this exact
// (organization, website) pair. Because the code is bound to both, one
// organization cannot bind another organization's website, and only someone with
// dashboard access to the website could have written the setting. It runs only
// for Crisp/managed providers; nothing is persisted before it returns, so a
// failed check creates no row. Returned Invalid errors are surfaced to the
// client and contain only guidance, never the code or the token.
func (r *Resolver) verifyCrispOwnership(ctx context.Context, input types.CreateAPIKeyConnectorInput) error {
	return r.verifyCrispOwnershipWith(ctx, input, drivers.GetCrispSubscriptionSettings)
}

// verifyCrispOwnershipWith is verifyCrispOwnership with the settings fetch
// injected, so its branch wiring can be unit-tested without reaching the live
// Crisp API. verifyCrispOwnership passes the real
// drivers.GetCrispSubscriptionSettings.
func (r *Resolver) verifyCrispOwnershipWith(ctx context.Context, input types.CreateAPIKeyConnectorInput, fetch crispSettingsFetcher) error {
	if input.CrispWebsiteID == nil || strings.TrimSpace(*input.CrispWebsiteID) == "" {
		return gqlutils.Invalidf(ctx, "crispWebsiteId is required")
	}

	websiteID := strings.TrimSpace(*input.CrispWebsiteID)

	// The managed plugin token gates the connector's visibility, so it is set
	// here; treat its absence as an internal error rather than client input.
	managedKey, ok := r.providerRegistry.ManagedAPIKey(input.Provider)
	if !ok {
		r.logger.ErrorCtx(ctx, "crisp managed api key not configured")

		return gqlutils.Internal(ctx)
	}

	// The plugin ID is a separate managed value the per-website plugin API
	// needs; the bootstrap requires it alongside the token, so its absence is a
	// deployment misconfiguration.
	pluginID, ok := r.providerRegistry.ManagedResourceID(input.Provider)
	if !ok {
		r.logger.ErrorCtx(ctx, "crisp plugin id not configured")

		return gqlutils.Internal(ctx)
	}

	conn := r.newAPIKeyConnection(input.Provider, managedKey)

	httpClient, err := conn.Client(ctx)
	if err != nil {
		r.logger.ErrorCtx(ctx, "cannot build crisp verification client", log.Error(err))

		return gqlutils.Internal(ctx)
	}

	settings, err := fetch(ctx, httpClient, websiteID, pluginID)

	switch {
	case errors.Is(err, drivers.ErrCrispPluginNotSubscribed):
		return gqlutils.Invalidf(ctx, "install and configure the Probo plugin on this Crisp website, then retry")
	case err != nil:
		r.logger.ErrorCtx(ctx, "cannot read crisp subscription settings", log.Error(err))

		return gqlutils.Internal(ctx)
	}

	if !verifyCrispVerificationCode(r.tokenSecret, input.OrganizationID.String(), websiteID, settings.ProboVerificationCode) {
		return gqlutils.Invalidf(ctx, "verification code mismatch: paste the code shown in Probo into the plugin settings, then retry")
	}

	return nil
}

// apiKeyConnectorSettings marshals the provider-specific extra settings
// for an API-key connector from the typed gqlgen input into the JSON
// blob persisted on coredata.Connector.RawSettings. It returns (nil,
// nil) for providers without extra settings.
//
// Returned errors are surfaced verbatim to the client via
// gqlutils.Invalid: they must contain only field names and structural
// information, never user-supplied values.
func apiKeyConnectorSettings(input types.CreateAPIKeyConnectorInput) (json.RawMessage, error) {
	switch input.Provider {
	case coredata.ConnectorProviderTally:
		if input.TallyOrganizationID == nil || *input.TallyOrganizationID == "" {
			return nil, fmt.Errorf("cannot create tally connector: tallyOrganizationId is required")
		}

		return json.Marshal(&coredata.TallyConnectorSettings{OrganizationID: *input.TallyOrganizationID})
	case coredata.ConnectorProviderSentry:
		if input.SentryOrganizationSlug == nil || *input.SentryOrganizationSlug == "" {
			return nil, fmt.Errorf("cannot create sentry connector: sentryOrganizationSlug is required")
		}

		return json.Marshal(&coredata.SentryConnectorSettings{OrganizationSlug: *input.SentryOrganizationSlug})
	case coredata.ConnectorProviderSupabase:
		if input.SupabaseOrganizationSlug == nil || *input.SupabaseOrganizationSlug == "" {
			return nil, fmt.Errorf("cannot create supabase connector: supabaseOrganizationSlug is required")
		}

		return json.Marshal(&coredata.SupabaseConnectorSettings{OrganizationSlug: *input.SupabaseOrganizationSlug})
	case coredata.ConnectorProviderGitHub:
		if input.GithubOrganization == nil || *input.GithubOrganization == "" {
			return nil, fmt.Errorf("cannot create github connector: githubOrganization is required")
		}

		return json.Marshal(&coredata.GitHubConnectorSettings{Organization: *input.GithubOrganization})
	case coredata.ConnectorProviderGrafana:
		if input.GrafanaBaseURL == nil || *input.GrafanaBaseURL == "" {
			return nil, fmt.Errorf("cannot create grafana connector: grafanaBaseUrl is required")
		}

		u, err := url.Parse(*input.GrafanaBaseURL)
		if err != nil || (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
			return nil, fmt.Errorf("cannot create grafana connector: grafanaBaseUrl must be an http(s) URL")
		}

		return json.Marshal(&coredata.GrafanaConnectorSettings{BaseURL: *input.GrafanaBaseURL})
	case coredata.ConnectorProviderSigNoz:
		if input.SignozBaseURL == nil || *input.SignozBaseURL == "" {
			return nil, fmt.Errorf("cannot create signoz connector: signozBaseUrl is required")
		}

		u, err := url.Parse(*input.SignozBaseURL)
		if err != nil || (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
			return nil, fmt.Errorf("cannot create signoz connector: signozBaseUrl must be an http(s) URL")
		}

		return json.Marshal(&coredata.SigNozConnectorSettings{BaseURL: *input.SignozBaseURL})
	case coredata.ConnectorProviderOnePassword:
		if input.OnePasswordScimBridgeURL == nil || *input.OnePasswordScimBridgeURL == "" {
			return nil, fmt.Errorf("cannot create 1password connector: onePasswordScimBridgeURL is required")
		}

		u, err := url.Parse(*input.OnePasswordScimBridgeURL)
		if err != nil || (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
			return nil, fmt.Errorf("cannot create 1password connector: onePasswordScimBridgeURL must be an http(s) URL")
		}

		return json.Marshal(&coredata.OnePasswordConnectorSettings{SCIMBridgeURL: *input.OnePasswordScimBridgeURL})
	case coredata.ConnectorProviderMetabase:
		if input.MetabaseInstanceURL == nil || *input.MetabaseInstanceURL == "" {
			return nil, fmt.Errorf("cannot create metabase connector: metabaseInstanceUrl is required")
		}

		u, err := url.Parse(*input.MetabaseInstanceURL)
		if err != nil || (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
			return nil, fmt.Errorf("cannot create metabase connector: metabaseInstanceUrl must be an http(s) URL")
		}

		return json.Marshal(&coredata.MetabaseConnectorSettings{InstanceURL: *input.MetabaseInstanceURL})
	case coredata.ConnectorProviderPostHog:
		region := ""
		if input.PosthogRegion != nil {
			region = *input.PosthogRegion
		}

		instanceURL := ""
		if input.PosthogInstanceURL != nil {
			instanceURL = *input.PosthogInstanceURL
		}

		// Cloud (region) and self-hosted (instance URL) are mutually
		// exclusive; exactly one identifies the connection's data host.
		switch {
		case region != "" && instanceURL != "":
			return nil, fmt.Errorf("cannot create posthog connector: set either posthogRegion or posthogInstanceUrl, not both")
		case region != "":
			baseURL, ok := drivers.PostHogRegionBaseURL(region)
			if !ok {
				return nil, fmt.Errorf("cannot create posthog connector: posthogRegion must be US or EU")
			}

			return json.Marshal(&coredata.PostHogConnectorSettings{BaseURL: baseURL})
		case instanceURL != "":
			u, err := url.Parse(instanceURL)
			if err != nil || (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
				return nil, fmt.Errorf("cannot create posthog connector: posthogInstanceUrl must be an http(s) URL")
			}

			return json.Marshal(&coredata.PostHogConnectorSettings{BaseURL: instanceURL})
		default:
			return nil, fmt.Errorf("cannot create posthog connector: posthogRegion or posthogInstanceUrl is required")
		}
	case coredata.ConnectorProviderOkta:
		if input.OktaDomain == nil || *input.OktaDomain == "" {
			return nil, fmt.Errorf("cannot create okta connector: oktaDomain is required")
		}

		// NormalizeOktaDomain strips scheme/path and validates the host; the
		// stored value is the bare org domain (e.g. "acme.okta.com"). Use a
		// static error message — this string is surfaced verbatim to the
		// client and must never echo the operator-supplied input.
		domain, err := connector.NormalizeOktaDomain(*input.OktaDomain)
		if err != nil {
			return nil, fmt.Errorf("cannot create okta connector: oktaDomain must be a valid Okta domain (e.g. acme.okta.com)")
		}

		return json.Marshal(&coredata.OktaConnectorSettings{Domain: domain})
	case coredata.ConnectorProviderBetterStack:
		if input.BetterStackTeamName == nil || *input.BetterStackTeamName == "" {
			return nil, fmt.Errorf("cannot create better stack connector: betterStackTeamName is required")
		}

		return json.Marshal(&coredata.BetterStackConnectorSettings{TeamName: *input.BetterStackTeamName})
	case coredata.ConnectorProviderQovery:
		if input.QoveryOrganizationID == nil || *input.QoveryOrganizationID == "" {
			return nil, fmt.Errorf("cannot create qovery connector: qoveryOrganizationId is required")
		}

		return json.Marshal(&coredata.QoveryConnectorSettings{OrganizationID: *input.QoveryOrganizationID})
	case coredata.ConnectorProviderRender:
		if input.RenderWorkspaceID == nil || *input.RenderWorkspaceID == "" {
			return nil, fmt.Errorf("cannot create render connector: renderWorkspaceId is required")
		}

		return json.Marshal(&coredata.RenderConnectorSettings{OwnerID: *input.RenderWorkspaceID})
	case coredata.ConnectorProviderNeon:
		if input.NeonOrganizationID == nil || *input.NeonOrganizationID == "" {
			return nil, fmt.Errorf("cannot create neon connector: neonOrganizationId is required")
		}

		return json.Marshal(&coredata.NeonConnectorSettings{OrganizationID: *input.NeonOrganizationID})
	case coredata.ConnectorProviderLangfuse:
		if input.LangfuseBaseURL == nil || *input.LangfuseBaseURL == "" {
			return nil, fmt.Errorf("cannot create langfuse connector: langfuseBaseUrl is required")
		}

		u, err := url.Parse(*input.LangfuseBaseURL)
		if err != nil || (u.Scheme != "http" && u.Scheme != "https") || u.Host == "" {
			return nil, fmt.Errorf("cannot create langfuse connector: langfuseBaseUrl must be an http(s) URL")
		}

		return json.Marshal(&coredata.LangfuseConnectorSettings{BaseURL: *input.LangfuseBaseURL})
	case coredata.ConnectorProviderScaleway:
		if input.ScalewayOrganizationID == nil || *input.ScalewayOrganizationID == "" {
			return nil, fmt.Errorf("cannot create scaleway connector: scalewayOrganizationId is required")
		}

		return json.Marshal(&coredata.ScalewayConnectorSettings{OrganizationID: *input.ScalewayOrganizationID})
	case coredata.ConnectorProviderSegment:
		region := ""
		if input.SegmentRegion != nil {
			region = strings.ToUpper(strings.TrimSpace(*input.SegmentRegion))
		}

		// The region selects the API host and is not discoverable from the
		// token; resolve it to a base URL against a fixed allow-list so an
		// unexpected value cannot reach the driver.
		var baseURL string

		switch region {
		case "US":
			baseURL = "https://api.segmentapis.com"
		case "EU":
			baseURL = "https://eu1.api.segmentapis.com"
		default:
			return nil, fmt.Errorf("cannot create segment connector: segmentRegion must be US or EU")
		}

		return json.Marshal(&coredata.SegmentConnectorSettings{BaseURL: baseURL})
	case coredata.ConnectorProviderCrisp:
		websiteID := ""
		if input.CrispWebsiteID != nil {
			websiteID = strings.TrimSpace(*input.CrispWebsiteID)
		}

		if websiteID == "" {
			return nil, fmt.Errorf("cannot create crisp connector: crispWebsiteId is required")
		}

		// Persist the same trimmed value that verifyCrispOwnership proved and the
		// crispVerificationCode query minted the code against, so the stored,
		// verified, and displayed website are identical (a padded value would
		// verify then break the driver's URL).
		return json.Marshal(&coredata.CrispConnectorSettings{WebsiteID: websiteID})
	}

	return nil, nil
}

// clientCredentialsConnectorSettings marshals the provider-specific
// extra settings for a client-credentials connector. See
// apiKeyConnectorSettings for the error contract.
func clientCredentialsConnectorSettings(input types.CreateClientCredentialsConnectorInput) (json.RawMessage, error) {
	switch input.Provider {
	case coredata.ConnectorProviderOnePassword:
		if input.OnePasswordAccountID == nil || *input.OnePasswordAccountID == "" ||
			input.OnePasswordRegion == nil || *input.OnePasswordRegion == "" {
			return nil, fmt.Errorf("cannot create 1password connector: onePasswordAccountId and onePasswordRegion are required")
		}

		return json.Marshal(&coredata.OnePasswordUsersAPISettings{
			AccountID: *input.OnePasswordAccountID,
			Region:    *input.OnePasswordRegion,
		})
	}

	return nil, nil
}