import { IUserRepository } from '../../../Domain/IRepository/IUserRepository';
import { IOrganizationRepository } from '../../../Domain/IRepository/IOrganizationRepository';
import { LoginCommand } from './LoginCommand';
import { ShortUserDto } from '../../DTOs/UserDto';
import { UserMapper } from '../../DTOs/Mappers/UserMapper';
import { PasswordService } from '../../Services/PasswordService';
import { JWTService } from '../../Services/JWTService';
import { UserState } from '../../../Domain/User/UserAggregate';
import { logAuth, logDatabase, logError, logWarning } from '../../Services/Logger';
import { Response } from 'express';

export interface LoginResponse {
  user: ShortUserDto;
  token: string;
  requiresOrgReauth?: boolean;
  orgLoginUrl?: string;
  organizationName?: string;
}

export class LoginCommandHandler {
  constructor(
    private readonly userRepo: IUserRepository,
    private readonly jwtService: JWTService,
    private readonly orgRepo: IOrganizationRepository
  ) {}

  async execute(cmd: LoginCommand, res?: Response): Promise<LoginResponse | null> {
    const startTime = Date.now();
    
    try {
      logAuth('Login attempt', undefined, { username: cmd.username });
      
      const user = await this.userRepo.findByUsername(cmd.username) || 
                    await this.userRepo.findByEmail(cmd.username);
      
      logDatabase('User lookup completed', undefined, Date.now() - startTime, {
        found: !!user,
        searchBy: cmd.username.includes('@') ? 'email' : 'username'
      });
      
      if (!user) {
        logAuth('Login failed - User not found', undefined, { username: cmd.username });
        return null;
      }

      // Check if user account state allows login
      const restrictedStates = [
        UserState.REGISTERED_NOT_VERIFIED,
        UserState.SOFT_DELETE,
        UserState.DEACTIVATED
      ];

      if (restrictedStates.includes(user.state)) {
        let stateDescription = '';
        switch (user.state) {
          case UserState.REGISTERED_NOT_VERIFIED:
            stateDescription = 'Email not verified';
            break;
          case UserState.SOFT_DELETE:
            stateDescription = 'Account deleted';
            break;
          case UserState.DEACTIVATED:
            stateDescription = 'Account deactivated';
            break;
        }
        
        logAuth('Login failed - Account state restriction', user.id, { 
          username: cmd.username,
          userState: user.state,
          stateDescription 
        });
        return null;
      }

      try {
        const passwordStartTime = Date.now();
        const isPasswordValid = await PasswordService.verifyPassword(cmd.password, user.password);
        
        logAuth('Password verification completed', user.id, {
          valid: isPasswordValid,
          verificationTime: Date.now() - passwordStartTime
        });
        
        if (!isPasswordValid) {
          logWarning('Login failed - Invalid password', {
            userId: user.id,
            username: cmd.username
          });
          return null;
        }
      } catch (error) {
        logError('Password verification error', error as Error);
        return null;
      }

      const mockRes = {
        cookie: () => {}
      } as any;

      const tokenPayload = {
        userId: user.id,
        authLevel: (user.state === UserState.ADMIN ? 1 : 0) as 0 | 1,
        userStatus: user.state,
        orgId: user.orgid || ''
      };
      
      try {
        // Use the real response object if provided, otherwise use mock
        const responseObj = res || mockRes;
        const token = this.jwtService.create(tokenPayload, responseObj);
        
        // Check if user belongs to an organization and needs reauthentication
        let requiresOrgReauth = false;
        let orgLoginUrl: string | undefined;
        let organizationName: string | undefined;

        if (user.orgid) {
          const organization = await this.orgRepo.findById(user.orgid);
          if (organization) {
            organizationName = organization.name;
            
            // Check if user has logged in to organization within the last month
            const oneMonthAgo = new Date();
            oneMonthAgo.setMonth(oneMonthAgo.getMonth() - 1);
            
            const needsReauth = !user.Orglogindate || user.Orglogindate < oneMonthAgo;
            
            if (needsReauth && organization.url) {
              requiresOrgReauth = true;
              orgLoginUrl = organization.url;
              
              logAuth('User requires organization reauthentication', user.id, {
                organizationId: user.orgid,
                organizationName: organization.name,
                lastOrgLogin: user.Orglogindate?.toISOString() || 'never',
                orgLoginUrl: organization.url
              });
            }
          }
        }
        
        logAuth('Login successful', user.id, {
          authLevel: tokenPayload.authLevel,
          userStatus: tokenPayload.userStatus,
          orgId: tokenPayload.orgId,
          requiresOrgReauth,
          organizationName,
          totalLoginTime: Date.now() - startTime
        });
        
        const response: LoginResponse = {
          user: UserMapper.toShortDto(user),
          token
        };

        if (requiresOrgReauth) {
          response.requiresOrgReauth = true;
          response.orgLoginUrl = orgLoginUrl;
          response.organizationName = organizationName;
        }

        return response;
      } catch (error) {
        logError('Token creation failed during login', error as Error);
        throw new Error('Login failed due to internal error');
      }
    } catch (error) {
      if (error instanceof Error) {
        logError('Login handler error', error);
        
        // Handle database connection errors
        if (error.message.includes('database connection')) {
          logDatabase('Database connection error during login', undefined, Date.now() - startTime);
          throw new Error('Database connection error');
        }
        
        // If it's already a properly formatted error, re-throw it
        if (error.message === 'Login failed due to internal error' || 
            error.message === 'Database connection error') {
          throw error;
        }
      }
      // Default database error handling
      logDatabase('Unexpected database error during login', undefined, Date.now() - startTime);
      throw new Error('Database connection error');
    }
  }
}