import type { User } from '@/types'

const API_BASE_URL = '/api'

class AuthService {
  /**
   * Get the current authenticated user from the session cookie.
   * Returns null if not authenticated.
   */
  async getCurrentUser(): Promise<User | null> {
    try {
      const response = await fetch(`${API_BASE_URL}/auth/me`, {
        method: 'GET',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
      })

      if (!response.ok) {
        if (response.status === 401) {
          return null
        }
        throw new Error(`HTTP error! status: ${response.status}`)
      }

      const user: User = await response.json()
      return user
    } catch (error) {
      console.error('Failed to get current user:', error)
      return null
    }
  }

  /**
   * Logout the current user by clearing the session cookie.
   */
  async logout(): Promise<void> {
    try {
      const response = await fetch(`${API_BASE_URL}/auth/logout`, {
        method: 'POST',
        credentials: 'include',
        headers: {
          'Content-Type': 'application/json',
        },
      })

      if (!response.ok) {
        throw new Error(`HTTP error! status: ${response.status}`)
      }
    } catch (error) {
      console.error('Logout failed:', error)
      throw error
    }
  }

  /**
   * Redirect to the login endpoint to initiate OAuth flow.
   */
  login(): void {
    // In development with Vite proxy, we can use relative URL
    // In production, this will be proxied by nginx
    window.location.href = `${API_BASE_URL}/login`
  }
}

export const authService = new AuthService()