//! Production Secret Validation Fix - Insecure Default Detection
//!
//! # Security Context
//!
//! **Vulnerability:** Production deployment with insecure default secrets
//! **Severity:** CRITICAL (P0 Blocker)
//! **Location:** `src/bin/iron_control_api_server.rs:395-452`
//!
//! ## Vulnerability Details
//!
//! The Iron Control API server accepted startup with default development secrets
//! in production environments. This allowed multiple attack vectors:
//!
//! 1. **JWT Forgery**: Using known `JWT_SECRET=dev-secret-change-in-production`
//!    to forge access tokens for any user
//! 2. **Budget Bypass**: Using known `IC_TOKEN_SECRET` to create fake IC Tokens
//!    and access budgets without authorization
//! 3. **Session Hijacking**: Using all-zeros `IP_TOKEN_KEY` to decrypt/forge
//!    IP Tokens (AES-256-GCM encrypted session data)
//! 4. **Data Breach**: Predictable secrets enable full system compromise
//!
//! ### Attack Vector
//!
//! 1. Attacker deploys server to production (Kubernetes, AWS, etc.)
//! 2. Server starts with default secrets (no env vars configured)
//! 3. Attacker uses default `JWT_SECRET` to forge admin access token
//! 4. Attacker uses default `IC_TOKEN_SECRET` to forge budget tokens
//! 5. Complete system compromise
//!
//! ### Impact
//!
//! - Unauthorized access to all user accounts
//! - Budget theft and fraud
//! - Session hijacking
//! - Data exfiltration
//! - No audit trail (forged tokens appear legitimate)
//!
//! ## Fix Applied
//!
//! Add strict validation before server initialization that:
//!
//! 1. Detects production deployment mode
//! 2. Validates all critical secrets are NOT default values
//! 3. Blocks server startup with panic if insecure defaults detected
//! 4. Provides clear error messages with remediation steps
//!
//! ```rust
//! // AFTER FIX:
//! match mode
//! {
//!   DeploymentMode::Production | DeploymentMode::ProductionUnconfirmed =>
//!   {
//!     let mut insecure_secrets = Vec::new();
//!
//!     // Check each secret against known defaults
//!     if jwt_secret == "dev-secret-change-in-production" {
//!       insecure_secrets.push( "JWT_SECRET" );
//!     }
//!
//!     if ic_token_secret == "dev-ic-token-secret-change-in-production" {
//!       insecure_secrets.push( "IC_TOKEN_SECRET" );
//!     }
//!
//!     if ip_token_key_hex == "0000...0000" {
//!       insecure_secrets.push( "IP_TOKEN_KEY" );
//!     }
//!
//!     // Block startup if any insecure defaults
//!     if !insecure_secrets.is_empty() {
//!       panic!( "Production deployment blocked: {} insecure default secret(s)", ... );
//!     }
//!   }
//!   _ => {}  // Dev/Pilot mode - defaults OK
//! }
//! ```
//!
//! ## Test Strategy
//!
//! These tests verify that production mode deployment is BLOCKED when using
//! insecure default secrets, but ALLOWED with secure custom secrets.
//!
//! ### Test Matrix
//!
//! | Test | Deployment Mode | Secret Values | Expected Outcome |
//! |------|----------------|---------------|------------------|
//! | Documentation test 1 | Production | All defaults | BLOCKED (panic) |
//! | Documentation test 2 | Production | Secure secrets | ALLOWED (starts) |
//! | Documentation test 3 | Pilot | All defaults | ALLOWED (dev mode) |
//! | Documentation test 4 | ProductionUnconfirmed | JWT default only | BLOCKED (partial defaults) |
//!
//! **Note:** Actual server startup tests are not possible in unit tests (require
//! full async runtime + database + network binding). These tests document the
//! expected behavior. Real validation occurs during integration testing and
//! production deployment.

/// **Test 1 (Documentation):** Production mode with all default secrets must be blocked
///
/// **Expected:** Server panics with clear error message listing all insecure secrets
///
/// **Environment:**
/// - `IRON_DEPLOYMENT_MODE=production`
/// - `JWT_SECRET=dev-secret-change-in-production` (default)
/// - `IC_TOKEN_SECRET=dev-ic-token-secret-change-in-production` (default)
/// - `IP_TOKEN_KEY=0000...0000` (default)
///
/// **Validation:**
/// ```bash
/// export IRON_DEPLOYMENT_MODE=production
/// # Don't set JWT_SECRET, IC_TOKEN_SECRET, IP_TOKEN_KEY (use defaults)
/// cargo run --bin iron_control_api_server
/// # Expected: Panic with "Production deployment blocked: 3 insecure default secret(s) detected"
/// ```
#[test]
fn test_production_with_all_defaults_blocked_documented()
{
  // This test documents that production deployment with default secrets
  // must panic before server initialization. The validation code at
  // iron_control_api_server.rs:395-452 checks:
  //
  // 1. JWT_SECRET == "dev-secret-change-in-production" → insecure
  // 2. IC_TOKEN_SECRET == "dev-ic-token-secret-change-in-production" → insecure
  // 3. IP_TOKEN_KEY == "0000...0000" → insecure
  //
  // If any insecure secret detected → panic with error message
  //
  // Real test: Start server with IRON_DEPLOYMENT_MODE=production and no
  // secret env vars, observe panic with 3 insecure secrets listed.
}

/// **Test 2 (Documentation):** Production mode with secure secrets must be allowed
///
/// **Expected:** Server starts successfully
///
/// **Environment:**
/// - `IRON_DEPLOYMENT_MODE=production`
/// - `JWT_SECRET=$(openssl rand -hex 32)` (secure random)
/// - `IC_TOKEN_SECRET=$(openssl rand -hex 32)` (secure random)
/// - `IP_TOKEN_KEY=$(openssl rand -hex 32)` (secure random)
/// - `DATABASE_URL=postgres://user:pass@host/db` (production DB)
///
/// **Validation:**
/// ```bash
/// export IRON_DEPLOYMENT_MODE=production
/// export JWT_SECRET=$(openssl rand -hex 32)
/// export IC_TOKEN_SECRET=$(openssl rand -hex 32)
/// export IP_TOKEN_KEY=$(openssl rand -hex 32)
/// export DATABASE_URL=postgres://user:pass@localhost/iron
/// cargo run --bin iron_control_api_server
/// # Expected: Server starts with "✓ Production secret validation passed"
/// ```
#[test]
fn test_production_with_secure_secrets_allowed_documented()
{
  // This test documents that production deployment with secure secrets
  // is allowed to start. The validation at iron_control_api_server.rs:395-452
  // checks each secret against defaults and only blocks if matches found.
  //
  // With all secrets set to random values:
  // - jwt_secret != "dev-secret-change-in-production" → secure
  // - ic_token_secret != "dev-ic-token-secret-change-in-production" → secure
  // - ip_token_key_hex != "0000...0000" → secure
  //
  // Result: insecure_secrets.is_empty() == true → server starts
  //
  // Real test: Start server with IRON_DEPLOYMENT_MODE=production and all
  // secrets set to random values, observe successful startup.
}

/// **Test 3 (Documentation):** Pilot mode with default secrets must be allowed
///
/// **Expected:** Server starts successfully (defaults OK in development)
///
/// **Environment:**
/// - No `IRON_DEPLOYMENT_MODE` set (defaults to Pilot)
/// - All secrets use defaults
///
/// **Validation:**
/// ```bash
/// # Don't set IRON_DEPLOYMENT_MODE (pilot mode)
/// # Don't set secrets (use defaults)
/// cargo run --bin iron_control_api_server
/// # Expected: Server starts with "✓ Pilot mode (localhost only)"
/// ```
#[test]
fn test_pilot_with_defaults_allowed_documented()
{
  // This test documents that pilot/development mode allows default secrets.
  // The validation at iron_control_api_server.rs:395-452 only runs for:
  //
  //   DeploymentMode::Production | DeploymentMode::ProductionUnconfirmed
  //
  // In Pilot mode, the match arm `_ => {}` is hit, which skips validation
  // entirely. This is intentional - default secrets are acceptable for
  // localhost development.
  //
  // Real test: Start server without IRON_DEPLOYMENT_MODE and without secret
  // env vars, observe successful startup in pilot mode.
}

/// **Test 4 (Documentation):** ProductionUnconfirmed with partial defaults blocked
///
/// **Expected:** Server panics if ANY secret uses default (not all or nothing)
///
/// **Environment:**
/// - Release build (triggers ProductionUnconfirmed)
/// - `JWT_SECRET=dev-secret-change-in-production` (default - INSECURE)
/// - `IC_TOKEN_SECRET=$(openssl rand -hex 32)` (secure)
/// - `IP_TOKEN_KEY=$(openssl rand -hex 32)` (secure)
///
/// **Validation:**
/// ```bash
/// cargo build --release --bin iron_control_api_server
/// export IC_TOKEN_SECRET=$(openssl rand -hex 32)
/// export IP_TOKEN_KEY=$(openssl rand -hex 32)
/// # Don't set JWT_SECRET (use default)
/// ./target/release/iron_control_api_server
/// # Expected: Panic with "Production deployment blocked: 1 insecure default secret(s) detected"
/// # Expected: Error lists "JWT_SECRET" as insecure
/// ```
#[test]
fn test_production_unconfirmed_partial_defaults_blocked_documented()
{
  // This test documents that even a single insecure default is sufficient
  // to block production deployment. The validation accumulates ALL insecure
  // secrets:
  //
  //   let mut insecure_secrets = Vec::new();
  //   if jwt_secret == "dev-..." { insecure_secrets.push(...); }
  //   if ic_token_secret == "dev-..." { insecure_secrets.push(...); }
  //   if ip_token_key_hex == "000..." { insecure_secrets.push(...); }
  //
  //   if !insecure_secrets.is_empty() { panic!(...); }
  //
  // So if JWT_SECRET is default but others are secure:
  // - insecure_secrets = vec!["JWT_SECRET"]
  // - !insecure_secrets.is_empty() == true → panic
  //
  // Real test: Build release binary, set IC_TOKEN_SECRET and IP_TOKEN_KEY
  // to secure values but leave JWT_SECRET unset, observe panic listing
  // JWT_SECRET as the only insecure secret.
}

/// **Test 5 (Documentation):** Development mode with database wiping
///
/// **Expected:** Server wipes SQLite database before startup
///
/// **Environment:**
/// - `IRON_DEPLOYMENT_MODE=development`
/// - `DATABASE_URL=sqlite://./dev.db?mode=rwc`
///
/// **Validation:**
/// ```bash
/// export IRON_DEPLOYMENT_MODE=development
/// export DATABASE_URL=sqlite://./dev.db?mode=rwc
/// touch dev.db  # Create existing database
/// cargo run --bin iron_control_api_server
/// # Expected: Log shows "✓ Cleared dev.db"
/// # Expected: Fresh database created with migrations
/// ```
#[test]
fn test_development_mode_database_wiping_documented()
{
  // This test documents that development mode wipes the database for clean
  // state. The logic at iron_control_api_server.rs:333-360 extracts the
  // SQLite path and deletes it:
  //
  //   if let Some( db_path ) = extract_sqlite_path( &database_url ) {
  //     if std::path::Path::new( &db_path ).exists() {
  //       std::fs::remove_file( &db_path )?;
  //     }
  //   }
  //
  // This ensures each development run starts with a fresh database state.
  //
  // Real test: Create a SQLite file, set IRON_DEPLOYMENT_MODE=development,
  // start server, observe file is deleted and recreated.
}

// ## Fix Documentation
//
// **Fix(production-secret-validation):** Block server startup if insecure defaults detected in production
//
// **Root Cause:** Server allowed startup with default development secrets
// (dev-secret-change-in-production, all-zeros encryption keys) in production
// environments. This created multiple attack vectors: JWT forgery, IC Token
// forgery for budget bypass, IP Token decryption, and session hijacking.
//
// **Why Not Caught:** No tests validated secret configuration at server startup.
// Existing tests used in-memory test state creation (create_test_budget_state()),
// bypassing actual server initialization path where secrets are loaded from env vars.
// Deployment validation focused on runtime behavior, not initialization security checks.
// Production deployment procedures didn't include secret validation automation before
// service startup, relying on manual secret configuration without programmatic enforcement.
//
// **Pitfall:** Never allow fallback secrets in production. Production environments
// MUST have unique, cryptographically secure secrets configured. Using defaults is
// a CRITICAL security vulnerability - any attacker with knowledge of defaults can
// forge authentication tokens, bypass budgets, decrypt session data, and impersonate
// users. Always validate secrets before server initialization and BLOCK startup if
// insecure defaults detected. Use strict validation: even one default secret should
// prevent production deployment.
//
// **Prevention:**
// - Add strict secret validation for production mode
// - Check all critical secrets against known default values
// - Panic with clear error message if any default detected
// - Provide remediation instructions (openssl rand commands)
// - Test both positive (secure secrets) and negative (defaults) cases
//
// ## Verification
//
// ```bash
// # Test 1: Production with defaults (should panic)
// export IRON_DEPLOYMENT_MODE=production
// unset JWT_SECRET IC_TOKEN_SECRET IP_TOKEN_KEY
// cargo run --bin iron_control_api_server
// # Expected: Panic with "3 insecure default secret(s) detected"
//
// # Test 2: Production with secure secrets (should start)
// export IRON_DEPLOYMENT_MODE=production
// export JWT_SECRET=$(openssl rand -hex 32)
// export IC_TOKEN_SECRET=$(openssl rand -hex 32)
// export IP_TOKEN_KEY=$(openssl rand -hex 32)
// export DATABASE_URL=postgres://user:pass@localhost/iron
// cargo run --bin iron_control_api_server
// # Expected: Server starts with "✓ Production secret validation passed"
//
// # Test 3: Pilot mode with defaults (should start)
// unset IRON_DEPLOYMENT_MODE JWT_SECRET IC_TOKEN_SECRET IP_TOKEN_KEY
// cargo run --bin iron_control_api_server
// # Expected: Server starts in pilot mode
// ```
