package setting

import (
	"context"

	"haixun-backend/internal/library/authctx"
	app "haixun-backend/internal/library/errors"
	"haixun-backend/internal/library/errors/code"
	"haixun-backend/internal/svc"
)

// authorizeSettingAccess guards the generic settings API against horizontal
// privilege escalation (IDOR). The settings collection stores sensitive values
// such as AI / Brave / Exa API keys under the "user" and "account" scopes, so
// the caller must be the owner of the scope being accessed.
//
//   - "user":    scope_id must equal the caller uid (uid is enumerable).
//   - "account": the threads account must belong to the caller.
//   - other scopes (brand / persona / placement_topic / copy_mission ...):
//     keyed by unguessable ObjectIDs and hold non-secret research config;
//     ownership is enforced by their own feature endpoints. We still require an
//     authenticated actor here.
func authorizeSettingAccess(ctx context.Context, svcCtx *svc.ServiceContext, scope, scopeID string) error {
	actor, ok := authctx.ActorFromContext(ctx)
	if !ok || actor.UID == "" {
		return app.For(code.Auth).AuthUnauthorized("missing actor")
	}

	switch scope {
	case "user":
		if scopeID != actor.UID {
			return app.For(code.Setting).AuthForbidden("cannot access another user's settings")
		}
	case "account":
		if _, err := svcCtx.ThreadsAccount.Get(ctx, actor.TenantID, actor.UID, scopeID); err != nil {
			return app.For(code.Setting).AuthForbidden("cannot access settings of an account you do not own")
		}
	}

	return nil
}
