const API_BASE_URL = process.env.REACT_APP_API_URL || 'http://localhost:5000/api';

export interface LoginRequest {
  email: string;
  password: string;
  twoFactorCode?: string;
}

export interface RegisterRequest {
  email: string;
  password: string;
  firstName: string;
  lastName: string;
  phone?: string;
  company?: string;
  role?: 'channel_partner_admin' | 'channel_partner_manager' | 'channel_partner_sales' | 'channel_partner_support' | 'channel_partner_finance' | 'channel_partner_analyst' | 'reseller_admin' | 'reseller_manager' | 'reseller_sales' | 'reseller_support' | 'reseller_finance' | 'reseller_analyst' | 'system_admin' | 'system_support' | 'system_analyst' | 'read_only';
  userType?: 'channel_partner' | 'reseller' | 'system';
}

export interface AuthResponse {
  success: boolean;
  message: string;
  data?: {
    user: {
      id: number;
      email: string;
      firstName: string;
      lastName: string;
      phone?: string;
      company?: string;
      role: string;
      status: string;
      emailVerified: boolean;
      twoFactorEnabled: boolean;
      lastLogin?: string;
      roles: Array<{
        id: number;
        name: string;
        description: string;
        permissions: string[];
      }>;
    };
    accessToken: string;
    refreshToken: string;
    sessionId: string;
  };
}

export interface User {
  id: number;
  email: string;
  firstName: string;
  lastName: string;
  phone?: string;
  company?: string;
  role: string;
  status: string;
  emailVerified: boolean;
  twoFactorEnabled: boolean;
  lastLogin?: string;
  roles: Array<{
    id: number;
    name: string;
    description: string;
    permissions: string[];
  }>;
}

class ApiService {
  private baseURL: string;

  constructor() {
    this.baseURL = API_BASE_URL;
  }

  private async request<T>(
    endpoint: string,
    options: RequestInit = {}
  ): Promise<T> {
    const url = `${this.baseURL}${endpoint}`;
    
    const config: RequestInit = {
      headers: {
        'Content-Type': 'application/json',
        ...options.headers,
      },
      ...options,
    };

    // Add auth token if available
    const token = localStorage.getItem('accessToken');
    if (token) {
      config.headers = {
        ...config.headers,
        Authorization: `Bearer ${token}`,
      };
    }

    try {
      const response = await fetch(url, config);
      const data = await response.json();

      if (!response.ok) {
        throw new Error(data.message || 'API request failed');
      }

      return data;
    } catch (error) {
      console.error('API request failed:', error);
      throw error;
    }
  }

  // Authentication endpoints
  async login(credentials: LoginRequest): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/login', {
      method: 'POST',
      body: JSON.stringify(credentials),
    });
  }

  async register(userData: RegisterRequest): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/register', {
      method: 'POST',
      body: JSON.stringify(userData),
    });
  }

  async verifyEmail(email: string, otp: string): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/verify-email', {
      method: 'POST',
      body: JSON.stringify({ email, otp }),
    });
  }

  async resendVerificationEmail(email: string): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/resend-verification', {
      method: 'POST',
      body: JSON.stringify({ email }),
    });
  }

  async refreshToken(refreshToken: string): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/refresh-token', {
      method: 'POST',
      body: JSON.stringify({ refreshToken }),
    });
  }

  async getCurrentUser(): Promise<{ success: boolean; data: User }> {
    return this.request<{ success: boolean; data: User }>('/auth/me');
  }

  async logout(sessionId: string): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/logout', {
      method: 'POST',
      body: JSON.stringify({ sessionId }),
    });
  }

  async forgotPassword(email: string): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/forgot-password', {
      method: 'POST',
      body: JSON.stringify({ email }),
    });
  }

  async resetPassword(token: string, password: string): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/reset-password', {
      method: 'POST',
      body: JSON.stringify({ token, password }),
    });
  }

  // Two-factor authentication
  async setupTwoFactor(): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/setup-2fa', {
      method: 'POST',
    });
  }

  async enableTwoFactor(code: string): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/enable-2fa', {
      method: 'POST',
      body: JSON.stringify({ code }),
    });
  }

  async disableTwoFactor(code: string): Promise<AuthResponse> {
    return this.request<AuthResponse>('/auth/disable-2fa', {
      method: 'POST',
      body: JSON.stringify({ code }),
    });
  }

  // Profile management
  async updateProfile(profileData: Partial<User>): Promise<{ success: boolean; data: User }> {
    return this.request<{ success: boolean; data: User }>('/auth/profile', {
      method: 'PUT',
      body: JSON.stringify(profileData),
    });
  }

  async changePassword(currentPassword: string, newPassword: string): Promise<{ success: boolean; message: string }> {
    return this.request<{ success: boolean; message: string }>('/auth/change-password', {
      method: 'POST',
      body: JSON.stringify({ currentPassword, newPassword }),
    });
  }
}

export const apiService = new ApiService();
export default apiService;