import * as plugins from '../../plugins.ts';
import * as interfaces from '../../../ts_interfaces/index.ts';
import type { OpsServer } from '../classes.opsserver.ts';
import { AuthService } from '../../services/auth.service.ts';
import { User } from '../../models/user.ts';
import { AuthProvider, PlatformSettings } from '../../models/index.ts';

export class AuthHandler {
  public typedrouter = new plugins.typedrequest.TypedRouter();
  private authService: AuthService;

  constructor(private opsServerRef: OpsServer) {
    this.opsServerRef.typedrouter.addTypedRouter(this.typedrouter);
    this.authService = new AuthService();
  }

  /**
   * Initialize auth handler - must be called after construction
   */
  public async initialize(): Promise<void> {
    this.registerHandlers();
  }

  private registerHandlers(): void {
    // Login
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_Login>(
        'login',
        async (dataArg) => {
          try {
            const { email, password } = dataArg;

            if (!email || !password) {
              throw new plugins.typedrequest.TypedResponseError('Email and password are required');
            }

            const result = await this.authService.login(email, password);

            if (!result.success || !result.user || !result.accessToken || !result.refreshToken) {
              return {
                errorCode: result.errorCode,
                errorMessage: result.errorMessage,
              };
            }

            const user = result.user;
            const expiresAt = Date.now() + 15 * 60 * 1000; // 15 minutes

            const identity: interfaces.data.IIdentity = {
              jwt: result.accessToken,
              refreshJwt: result.refreshToken,
              userId: user.id,
              email: user.email,
              username: user.username,
              displayName: user.displayName,
              isSystemAdmin: user.isSystemAdmin,
              expiresAt,
              sessionId: result.sessionId!,
            };

            return {
              identity,
              user: {
                id: user.id,
                email: user.email,
                username: user.username,
                displayName: user.displayName,
                avatarUrl: user.avatarUrl,
                isSystemAdmin: user.isSystemAdmin,
                isActive: user.isActive,
                createdAt: user.createdAt instanceof Date
                  ? user.createdAt.toISOString()
                  : String(user.createdAt),
                lastLoginAt: user.lastLoginAt instanceof Date
                  ? user.lastLoginAt.toISOString()
                  : user.lastLoginAt
                  ? String(user.lastLoginAt)
                  : undefined,
              },
            };
          } catch (error) {
            if (error instanceof plugins.typedrequest.TypedResponseError) throw error;
            throw new plugins.typedrequest.TypedResponseError('Login failed');
          }
        },
      ),
    );

    // Refresh Token
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_RefreshToken>(
        'refreshToken',
        async (dataArg) => {
          try {
            if (!dataArg.identity?.refreshJwt) {
              throw new plugins.typedrequest.TypedResponseError('Refresh token is required');
            }

            const result = await this.authService.refresh(dataArg.identity.refreshJwt);

            if (!result.success || !result.user || !result.accessToken) {
              throw new plugins.typedrequest.TypedResponseError(
                result.errorMessage || 'Token refresh failed',
              );
            }

            const user = result.user;
            const expiresAt = Date.now() + 15 * 60 * 1000;

            return {
              identity: {
                jwt: result.accessToken,
                refreshJwt: dataArg.identity.refreshJwt,
                userId: user.id,
                email: user.email,
                username: user.username,
                displayName: user.displayName,
                isSystemAdmin: user.isSystemAdmin,
                expiresAt,
                sessionId: result.sessionId || dataArg.identity.sessionId,
              },
            };
          } catch (error) {
            if (error instanceof plugins.typedrequest.TypedResponseError) throw error;
            throw new plugins.typedrequest.TypedResponseError('Token refresh failed');
          }
        },
      ),
    );

    // Logout
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_Logout>(
        'logout',
        async (dataArg) => {
          try {
            if (!dataArg.identity?.jwt) {
              throw new plugins.typedrequest.TypedResponseError('Identity required');
            }

            if (dataArg.all) {
              const count = await this.authService.logoutAll(dataArg.identity.userId);
              return { message: `Logged out from ${count} sessions` };
            }

            const sessionId = dataArg.sessionId || dataArg.identity.sessionId;
            if (sessionId) {
              await this.authService.logout(sessionId, {
                userId: dataArg.identity.userId,
              });
            }

            return { message: 'Logged out successfully' };
          } catch (error) {
            if (error instanceof plugins.typedrequest.TypedResponseError) throw error;
            throw new plugins.typedrequest.TypedResponseError('Logout failed');
          }
        },
      ),
    );

    // Get Me
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetMe>(
        'getMe',
        async (dataArg) => {
          try {
            if (!dataArg.identity?.jwt) {
              throw new plugins.typedrequest.TypedResponseError('Identity required');
            }

            const validated = await this.authService.validateAccessToken(dataArg.identity.jwt);
            if (!validated) {
              throw new plugins.typedrequest.TypedResponseError('Invalid or expired token');
            }

            const user = validated.user;
            return {
              user: {
                id: user.id,
                email: user.email,
                username: user.username,
                displayName: user.displayName,
                avatarUrl: user.avatarUrl,
                isSystemAdmin: user.isSystemAdmin,
                isActive: user.isActive,
                createdAt: user.createdAt instanceof Date
                  ? user.createdAt.toISOString()
                  : String(user.createdAt),
                lastLoginAt: user.lastLoginAt instanceof Date
                  ? user.lastLoginAt.toISOString()
                  : user.lastLoginAt
                  ? String(user.lastLoginAt)
                  : undefined,
              },
            };
          } catch (error) {
            if (error instanceof plugins.typedrequest.TypedResponseError) throw error;
            throw new plugins.typedrequest.TypedResponseError('Failed to get user info');
          }
        },
      ),
    );

    // Get Auth Providers (public)
    this.typedrouter.addTypedHandler(
      new plugins.typedrequest.TypedHandler<interfaces.requests.IReq_GetAuthProviders>(
        'getAuthProviders',
        async (_dataArg) => {
          try {
            const settings = await PlatformSettings.get();
            const providers = await AuthProvider.getActiveProviders();

            return {
              providers: providers.map((p) => p.toPublicInfo()),
              localAuthEnabled: settings.auth.localAuthEnabled,
              defaultProviderId: settings.auth.defaultProviderId,
            };
          } catch (error) {
            if (error instanceof plugins.typedrequest.TypedResponseError) throw error;
            throw new plugins.typedrequest.TypedResponseError('Failed to get auth providers');
          }
        },
      ),
    );
  }

  // Guard for valid identity - validates JWT via AuthService
  public validIdentityGuard = new plugins.smartguard.Guard<{
    identity: interfaces.data.IIdentity;
  }>(
    async (dataArg) => {
      if (!dataArg.identity?.jwt) return false;
      try {
        const validated = await this.authService.validateAccessToken(dataArg.identity.jwt);
        if (!validated) return false;
        // Verify the userId matches the identity claim
        if (dataArg.identity.userId !== validated.user.id) return false;
        return true;
      } catch {
        return false;
      }
    },
    { failedHint: 'identity is not valid', name: 'validIdentityGuard' },
  );

  // Guard for admin identity - validates JWT + checks isSystemAdmin
  public adminIdentityGuard = new plugins.smartguard.Guard<{
    identity: interfaces.data.IIdentity;
  }>(
    async (dataArg) => {
      const isValid = await this.validIdentityGuard.exec(dataArg);
      if (!isValid) return false;
      // Check isSystemAdmin claim from the identity
      if (!dataArg.identity.isSystemAdmin) return false;
      // Double-check from database
      const user = await User.findById(dataArg.identity.userId);
      if (!user || !user.isSystemAdmin) return false;
      return true;
    },
    { failedHint: 'user is not admin', name: 'adminIdentityGuard' },
  );
}