import type { AstroCookies } from 'astro'

export type SessionData = { did?: string }

const COOKIE_NAME = 'sid'

// Simple cookie-based session using Web Crypto API
export class Session {
  private data: SessionData = {}
  private cookies: AstroCookies

  constructor(cookies: AstroCookies, data: SessionData = {}) {
    this.cookies = cookies
    this.data = data
  }

  get did() {
    return this.data.did
  }

  set did(value: string | undefined) {
    this.data.did = value
  }

  async save() {
    const jsonData = JSON.stringify(this.data)
    // For simplicity, we'll just base64 encode the data
    // In production, you'd want proper encryption
    const encoded = btoa(jsonData)

    this.cookies.set(COOKIE_NAME, encoded, {
      httpOnly: true,
      secure: false,
      sameSite: 'lax',
      path: '/',
      maxAge: 60 * 60 * 24 * 30, // 30 days
    })
  }

  destroy() {
    this.data = {}
    this.cookies.delete(COOKIE_NAME, { path: '/' })
  }
}

export function getSession(cookies: AstroCookies): Session {
  const cookie = cookies.get(COOKIE_NAME)

  if (!cookie?.value) {
    return new Session(cookies)
  }

  try {
    const decoded = atob(cookie.value)
    const data = JSON.parse(decoded) as SessionData
    return new Session(cookies, data)
  } catch (err) {
    console.warn('Failed to decode session:', err)
    return new Session(cookies)
  }
}