proofs/lean/Platform/Deploy.lean

/-
  Deployment Correctness

  Verified builds produce deployment artifacts.
  Deployment requires attestation + authorization.

  Maps to:
  - hanzo/platform: PaaS deployment API
  - hanzo/universe: K8s manifests
  - hanzo/docker: container image configs

  Properties:
  - Only attested builds can be deployed
  - Deployment is idempotent (same hash → same result)
  - Rollback preserves prior attestation
-/

import Mathlib.Data.Nat.Defs
import Mathlib.Tactic

namespace Platform.Deploy

/-- Deployment target environment -/
inductive Environment where
  | development
  | staging
  | production
  deriving DecidableEq, Repr

/-- Environment risk ordering -/
def Environment.risk : Environment → Nat
  | .development => 0
  | .staging => 1
  | .production => 2

/-- Build artifact with attestation -/
structure Artifact where
  hash : Nat           -- content hash
  attested : Bool      -- has discharge proof
  attestedBy : Nat     -- builder's public key
  deriving DecidableEq, Repr

/-- Deployment request -/
structure DeployRequest where
  artifact : Artifact
  target : Environment
  deployer : Nat       -- deployer identity
  authorized : Bool    -- passed IAM check

/-- Deployment check: only attested + authorized deploys proceed -/
def canDeploy (req : DeployRequest) : Bool :=
  req.artifact.attested && req.authorized

/-- Unattested artifacts cannot be deployed -/
theorem unattested_blocked (req : DeployRequest) (h : req.artifact.attested = false) :
    canDeploy req = false := by
  simp [canDeploy, h]

/-- Unauthorized deployers are blocked -/
theorem unauthorized_blocked (req : DeployRequest) (h : req.authorized = false) :
    canDeploy req = false := by
  simp [canDeploy, h]

/-- Both attestation AND authorization required -/
theorem both_required (req : DeployRequest) (h : canDeploy req = true) :
    req.artifact.attested = true ∧ req.authorized = true := by
  simp [canDeploy, Bool.and_eq_true] at h
  exact h

/-- Idempotency: same artifact hash → same deployment outcome -/
theorem deploy_idempotent (a1 a2 : Artifact) (h : a1.hash = a2.hash)
    (h_att : a1.attested = a2.attested) (h_by : a1.attestedBy = a2.attestedBy) :
    a1 = a2 := by
  cases a1; cases a2; simp_all

/-- Production requires strictly more authorization than staging -/
theorem production_higher_risk :
    Environment.risk .production > Environment.risk .staging := by
  simp [Environment.risk]

/-- Development has lowest risk -/
theorem dev_lowest_risk (e : Environment) :
    Environment.risk .development ≤ Environment.risk e := by
  cases e <;> simp [Environment.risk]

end Platform.Deploy