/**
 * Native Javascript implementation for XMSS tree generation
 * No external cryptography frameworks used.
 */
class XMSSNativeCore {
  constructor(height, hashFunction) {
    this.height = height;
    this.hashFunc = hashFunction; 
    this.leafCount = 1 << height;
    this.tree = new Array(2 * this.leafCount);
  }

  /**
   * Constructs the L-Tree using WOTS+ public keys
   * @param {Array} wotsKeys - Array of WOTS+ public key hashes
   */
  buildMerkleTree(wotsKeys) {
    if (wotsKeys.length !== this.leafCount) {
      throw new Error("Invalid WOTS+ key count for height");
    }

    // Insert leaves at the bottom of the tree array
    for (let i = 0; i < this.leafCount; i++) {
      this.tree[this.leafCount + i] = wotsKeys[i];
    }

    // Iteratively compute parent nodes up to the root
    for (let i = this.leafCount - 1; i > 0; i--) {
      const leftChild = this.tree[2 * i];
      const rightChild = this.tree[2 * i + 1];
      
      // Native ArrayBuffer concatenation for hashing
      const combined = this.concatBuffers(leftChild, rightChild);
      this.tree[i] = this.hashFunc(combined);
    }

    // Root public key is at index 1
    return this.tree[1]; 
  }

  concatBuffers(b1, b2) {
    let tmp = new Uint8Array(b1.byteLength + b2.byteLength);
    tmp.set(new Uint8Array(b1), 0);
    tmp.set(new Uint8Array(b2), b1.byteLength);
    return tmp.buffer;
  }
}

# AXEP Zero-Trust Proxy Configuration
# Front-end Nginx acting as a reverse proxy for Pomerium IAP

http {
    # Enforce strict mTLS at the edge
    ssl_verify_client on;
    ssl_client_certificate /etc/nginx/certs/axep_ca.crt;
    
    upstream pomerium_backend {
        server 127.0.0.1:443;
        keepalive 32;
    }

    server {
        listen 443 ssl http2;
        server_name id.axep.network;

        # Pass certificate data to Identity-Aware Proxy
        location / {
            proxy_pass https://pomerium_backend;
            
            # Injecting DID parameters into headers
            proxy_set_header X-Forwarded-Client-Cert $ssl_client_cert;
            proxy_set_header X-AXEP-Identity $ssl_client_s_dn;
            
            # WebSocket support for continuous auth streams
            proxy_http_version 1.1;
            proxy_set_header Upgrade $http_upgrade;
            proxy_set_header Connection "upgrade";
            
            # Timeout configs for long-lived Reality/VLESS tunnels
            proxy_read_timeout 3600s;
            proxy_send_timeout 3600s;
        }

        # Block all non-authenticated traffic before it hits the app logic
        if ($ssl_client_verify != SUCCESS) {
            return 403;
        }
    }
}

/// Solana Anchor Program: AXEP Identity Registry & Fee Logic
use anchor_lang::prelude::*;

declare_id!("Axep11111111111111111111111111111111111111");

#[program]
pub mod axep_registry {
    use super::*;

    /// Analyzes the position value and pending fees for an identity
    pub fn analyze_identity_position(
        ctx: Context<AnalyzePosition>, 
        access_frequency: u64
    ) -> Result<()> {
        let identity_account = &mut ctx.accounts.identity_account;
        
        // Calculate base reputation score multiplier
        let rep_multiplier = identity_account.reputation_score
            .checked_div(100)
            .unwrap_or(1);

        // Compute dynamic fees accrued from institutional access requests
        // Similar to calculating impermanent loss/fees in a V3 Pool
        let pending_fees = access_frequency
            .checked_mul(identity_account.base_fee_rate)
            .unwrap()
            .checked_mul(rep_multiplier)
            .unwrap();

        identity_account.accumulated_yield += pending_fees;
        identity_account.last_update_timestamp = Clock::get()?.unix_timestamp;

        msg!("Identity Position Analyzed. Accrued Fees: {}", pending_fees);
        Ok(())
    }
}

#[derive(Accounts)]
pub struct AnalyzePosition<'info> {
    #[account(mut)]
    pub identity_account: Account<'info, IdentityState>,
    pub authority: Signer<'info>,
}

#[account]
pub struct IdentityState {
    pub xmss_root_hash: [u8; 32], // Post-Quantum anchor
    pub reputation_score: u64,
    pub base_fee_rate: u64,
    pub accumulated_yield: u64,
    pub last_update_timestamp: i64,
}