import * as plugins from '../../plugins.js';
import type { OpsServer } from '../classes.opsserver.js';
import * as interfaces from '../../../ts_interfaces/index.js';

/**
 * CRUD + connection-test handlers for DnsProviderDoc.
 *
 * Auth: same dual-mode pattern as TargetProfileHandler — admin JWT or
 * API token with the appropriate `dns-providers:read|write` scope.
 */
export class DnsProviderHandler {
  public typedrouter = new plugins.typedrequest.TypedRouter();

  constructor(private opsServerRef: OpsServer) {
    this.opsServerRef.typedrouter.addTypedRouter(this.typedrouter);
    this.registerHandlers();
  }

  private async requireAuth(
    request: { identity?: interfaces.data.IIdentity; apiToken?: string },
    requiredScope?: interfaces.data.TApiTokenScope,
  ): Promise<string> {
    if (request.identity?.jwt) {
      try {
        const isAdmin = await this.opsServerRef.adminHandler.adminIdentityGuard.exec({
          identity: request.identity,
        });
        if (isAdmin) return request.identity.userId;
      } catch { /* fall through */ }
    }

    if (request.apiToken) {
      const tokenManager = this.opsServerRef.dcRouterRef.apiTokenManager;
      if (tokenManager) {
        const token = await tokenManager.validateToken(request.apiToken);
        if (token) {
          if (!requiredScope || tokenManager.hasScope(token, requiredScope)) {
            return token.createdBy;
          }
          throw new plugins.typedrequest.TypedResponseError('insufficient scope');
        }
      }
    }

    throw new plugins.typedrequest.TypedResponseError('unauthorized');
  }

  private registerHandlers(): void {
    // Get all providers — prepends the built-in DcRouter pseudo-provider
    // so operators see a uniform "who serves this?" list that includes the
    // authoritative dcrouter alongside external accounts.
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetDnsProviders>(
        'getDnsProviders',
        async (dataArg) => {
          await this.requireAuth(dataArg, 'dns-providers:read');
          const dnsManager = this.opsServerRef.dcRouterRef.dnsManager;
          const synthetic: interfaces.data.IDnsProviderPublic = {
            id: interfaces.data.DCROUTER_BUILTIN_PROVIDER_ID,
            name: 'DcRouter',
            type: 'dcrouter',
            status: 'ok',
            createdAt: 0,
            updatedAt: 0,
            createdBy: 'system',
            hasCredentials: false,
            builtIn: true,
          };
          const real = dnsManager ? await dnsManager.listProviders() : [];
          return { providers: [synthetic, ...real] };
        },
      ),
    );

    // Get single provider
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetDnsProvider>(
        'getDnsProvider',
        async (dataArg) => {
          await this.requireAuth(dataArg, 'dns-providers:read');
          const dnsManager = this.opsServerRef.dcRouterRef.dnsManager;
          if (!dnsManager) return { provider: null };
          return { provider: await dnsManager.getProvider(dataArg.id) };
        },
      ),
    );

    // Create provider
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_CreateDnsProvider>(
        'createDnsProvider',
        async (dataArg) => {
          const userId = await this.requireAuth(dataArg, 'dns-providers:write');
          if (dataArg.type === 'dcrouter') {
            return {
              success: false,
              message: 'cannot create built-in provider',
            };
          }
          const dnsManager = this.opsServerRef.dcRouterRef.dnsManager;
          if (!dnsManager) {
            return { success: false, message: 'DnsManager not initialized (DB disabled?)' };
          }
          const id = await dnsManager.createProvider({
            name: dataArg.name,
            type: dataArg.type,
            credentials: dataArg.credentials,
            createdBy: userId,
          });
          return { success: true, id };
        },
      ),
    );

    // Update provider
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_UpdateDnsProvider>(
        'updateDnsProvider',
        async (dataArg) => {
          await this.requireAuth(dataArg, 'dns-providers:write');
          if (dataArg.id === interfaces.data.DCROUTER_BUILTIN_PROVIDER_ID) {
            return { success: false, message: 'cannot edit built-in provider' };
          }
          const dnsManager = this.opsServerRef.dcRouterRef.dnsManager;
          if (!dnsManager) return { success: false, message: 'DnsManager not initialized' };
          const ok = await dnsManager.updateProvider(dataArg.id, {
            name: dataArg.name,
            credentials: dataArg.credentials,
          });
          return ok ? { success: true } : { success: false, message: 'Provider not found' };
        },
      ),
    );

    // Delete provider
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_DeleteDnsProvider>(
        'deleteDnsProvider',
        async (dataArg) => {
          await this.requireAuth(dataArg, 'dns-providers:write');
          if (dataArg.id === interfaces.data.DCROUTER_BUILTIN_PROVIDER_ID) {
            return { success: false, message: 'cannot delete built-in provider' };
          }
          const dnsManager = this.opsServerRef.dcRouterRef.dnsManager;
          if (!dnsManager) return { success: false, message: 'DnsManager not initialized' };
          return await dnsManager.deleteProvider(dataArg.id, dataArg.force ?? false);
        },
      ),
    );

    // Test provider connection
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_TestDnsProvider>(
        'testDnsProvider',
        async (dataArg) => {
          await this.requireAuth(dataArg, 'dns-providers:read');
          if (dataArg.id === interfaces.data.DCROUTER_BUILTIN_PROVIDER_ID) {
            return {
              ok: false,
              error: 'built-in provider has no external connection to test',
              testedAt: Date.now(),
            };
          }
          const dnsManager = this.opsServerRef.dcRouterRef.dnsManager;
          if (!dnsManager) {
            return { ok: false, error: 'DnsManager not initialized', testedAt: Date.now() };
          }
          return await dnsManager.testProvider(dataArg.id);
        },
      ),
    );

    // List domains visible to a provider's account (without importing them)
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_ListProviderDomains>(
        'listProviderDomains',
        async (dataArg) => {
          await this.requireAuth(dataArg, 'dns-providers:read');
          if (dataArg.providerId === interfaces.data.DCROUTER_BUILTIN_PROVIDER_ID) {
            return {
              success: false,
              message: 'built-in provider has no external domain listing — use "Add DcRouter Domain" instead',
            };
          }
          const dnsManager = this.opsServerRef.dcRouterRef.dnsManager;
          if (!dnsManager) return { success: false, message: 'DnsManager not initialized' };
          try {
            const domains = await dnsManager.listProviderDomains(dataArg.providerId);
            return { success: true, domains };
          } catch (err: unknown) {
            return { success: false, message: (err as Error).message };
          }
        },
      ),
    );
  }
}