# ── Sandbox: sandbox.neurontechnologies.ai ───────────────────────────────────
# Internal-only experimentation environment. Locked behind Cloudflare Access
# (email_domain == neurontechnologies.ai). Dedicated GCP service account with
# ZERO bindings on prod resources. Isolated Supabase project (separate from
# prod, NOT a schema in the prod project). No outbound email path. Public
# share / artifact endpoints respond with 410 Gone in this env.
#
# This file provisions the SHELL only (DNS, access control, Cloud Run stub,
# isolated SA, Secret Manager placeholders for the isolated Supabase). The
# real-soul build pipeline lands in a follow-up.
#
# Documentation: servers/gcp/sandbox/README.md

locals {
  sandbox_labels = {
    "managed-by" = "terraform"
    "project"    = "neuron-sandbox"
    "env"        = "sandbox"
    "isolation"  = "strict"
  }

  sandbox_image_initial = "us-docker.pkg.dev/cloudrun/container/hello"
  sandbox_image_stub    = "us-central1-docker.pkg.dev/${var.project_id}/neuron-sandbox/sandbox:initial"
}

# ── Artifact Registry — neuron-sandbox (isolated from neuron-marketing/etc) ──

resource "google_artifact_registry_repository" "sandbox" {
  location      = "us-central1"
  repository_id = "neuron-sandbox"
  description   = "Sandbox stub + future real-soul images. Isolated from prod registries."
  format        = "DOCKER"
  project       = var.project_id

  labels = local.sandbox_labels

  cleanup_policies {
    id     = "keep-last-5"
    action = "KEEP"
    most_recent_versions {
      keep_count = 5
    }
  }
}

# ── Service Account — neuron-sandbox ─────────────────────────────────────────
# Dedicated SA for the sandbox Cloud Run service. NO project-level IAM
# bindings: every grant below is resource-scoped to sandbox secrets ONLY.
# Any prod resource (neuron-marketing-*, accounts-*, api-*, supabase-service-key,
# stripe-*, etc.) is unreachable to this SA by design.

resource "google_service_account" "neuron_sandbox" {
  account_id   = "neuron-sandbox"
  display_name = "Neuron Sandbox Cloud Run SA"
  description  = "Isolated SA for sandbox.neurontechnologies.ai. Zero IAM on prod resources."
  project      = var.project_id
}

# ── Sandbox Supabase secrets (placeholders) ──────────────────────────────────
# These secrets are created here so the Cloud Run service can reference them
# from day one. The values are populated AFTER the Supabase project is
# provisioned (see servers/gcp/sandbox/README.md).
#
# Initial value is a placeholder string; first-time deploy of the real soul
# requires running `gcloud secrets versions add <secret> --data-file=...` to
# write the actual values.

resource "google_secret_manager_secret" "sandbox_supabase_url" {
  secret_id = "sandbox-supabase-url"
  project   = var.project_id
  labels    = local.sandbox_labels

  replication {
    auto {}
  }
}

resource "google_secret_manager_secret" "sandbox_supabase_anon_key" {
  secret_id = "sandbox-supabase-anon-key"
  project   = var.project_id
  labels    = local.sandbox_labels

  replication {
    auto {}
  }
}

resource "google_secret_manager_secret" "sandbox_supabase_service_key" {
  secret_id = "sandbox-supabase-service-key"
  project   = var.project_id
  labels    = local.sandbox_labels

  replication {
    auto {}
  }
}

# Placeholder versions so the secrets resolve to *something* before real
# Supabase project is provisioned. The stub does not read them; the real
# soul will, and at that point the operator runs `gcloud secrets versions
# add` with the values from the new Supabase project.
resource "google_secret_manager_secret_version" "sandbox_supabase_url_placeholder" {
  secret      = google_secret_manager_secret.sandbox_supabase_url.id
  secret_data = "PLACEHOLDER_REPLACE_AFTER_SUPABASE_PROVISIONING"

  lifecycle {
    ignore_changes = [secret_data]
  }
}

resource "google_secret_manager_secret_version" "sandbox_supabase_anon_key_placeholder" {
  secret      = google_secret_manager_secret.sandbox_supabase_anon_key.id
  secret_data = "PLACEHOLDER_REPLACE_AFTER_SUPABASE_PROVISIONING"

  lifecycle {
    ignore_changes = [secret_data]
  }
}

resource "google_secret_manager_secret_version" "sandbox_supabase_service_key_placeholder" {
  secret      = google_secret_manager_secret.sandbox_supabase_service_key.id
  secret_data = "PLACEHOLDER_REPLACE_AFTER_SUPABASE_PROVISIONING"

  lifecycle {
    ignore_changes = [secret_data]
  }
}

# ── IAM — Resource-scoped, sandbox-only ──────────────────────────────────────
# Sandbox SA gets secretAccessor on the THREE sandbox-supabase-* secrets only.
# This is the entire IAM surface for the sandbox SA. There is no project-level
# role binding; any prod secret (e.g., supabase-service-key, anthropic-api-key,
# resend-api-key) returns PERMISSION_DENIED to this SA.

resource "google_secret_manager_secret_iam_member" "sandbox_url_accessor" {
  project   = var.project_id
  secret_id = google_secret_manager_secret.sandbox_supabase_url.secret_id
  role      = "roles/secretmanager.secretAccessor"
  member    = "serviceAccount:${google_service_account.neuron_sandbox.email}"
}

resource "google_secret_manager_secret_iam_member" "sandbox_anon_accessor" {
  project   = var.project_id
  secret_id = google_secret_manager_secret.sandbox_supabase_anon_key.secret_id
  role      = "roles/secretmanager.secretAccessor"
  member    = "serviceAccount:${google_service_account.neuron_sandbox.email}"
}

resource "google_secret_manager_secret_iam_member" "sandbox_service_accessor" {
  project   = var.project_id
  secret_id = google_secret_manager_secret.sandbox_supabase_service_key.secret_id
  role      = "roles/secretmanager.secretAccessor"
  member    = "serviceAccount:${google_service_account.neuron_sandbox.email}"
}

# ── Cloud Run — neuron-sandbox-us ────────────────────────────────────────────
# Single region (us-central1). Internal-only env doesn't need geo-distribution.
# Ingress is INGRESS_TRAFFIC_ALL because Cloudflare Access sits in front; the
# Cloud Run direct URL is obscure and not the front door.
#
# IMPORTANT: this service intentionally does NOT mount RESEND_API_KEY,
# stripe-*, anthropic-api-key, or any prod secret. Defense-in-depth against
# experimental code accidentally emailing real users or charging real cards.

resource "google_cloud_run_v2_service" "neuron_sandbox" {
  name     = "neuron-sandbox-us"
  location = "us-central1"
  project  = var.project_id

  ingress = "INGRESS_TRAFFIC_ALL"

  labels = local.sandbox_labels

  template {
    service_account = google_service_account.neuron_sandbox.email

    scaling {
      min_instance_count = 0
      max_instance_count = 3
    }

    containers {
      # Initial deploy uses the GCP hello image so the service exists before
      # the stub image is built and pushed. Switch to local.sandbox_image_stub
      # once the stub image is in Artifact Registry. Lifecycle ignore_changes
      # keeps subsequent CI image-tag bumps from being undone by terraform.
      image = local.sandbox_image_stub

      resources {
        limits = {
          cpu    = "1"
          memory = "512Mi"
        }
        cpu_idle = true
      }

      env {
        name  = "ENV"
        value = "sandbox"
      }
      env {
        name  = "SOUL_LOADED"
        value = "false"
      }
      env {
        name  = "SANDBOX_NO_EMAIL"
        value = "1"
      }
      env {
        name  = "SANDBOX_NO_SHARE"
        value = "1"
      }

      # Sandbox Supabase wiring -- placeholders until project is provisioned.
      env {
        name = "SUPABASE_URL"
        value_source {
          secret_key_ref {
            secret  = google_secret_manager_secret.sandbox_supabase_url.secret_id
            version = "latest"
          }
        }
      }
      env {
        name = "SUPABASE_ANON_KEY"
        value_source {
          secret_key_ref {
            secret  = google_secret_manager_secret.sandbox_supabase_anon_key.secret_id
            version = "latest"
          }
        }
      }
      env {
        name = "SUPABASE_SERVICE_KEY"
        value_source {
          secret_key_ref {
            secret  = google_secret_manager_secret.sandbox_supabase_service_key.secret_id
            version = "latest"
          }
        }
      }

      ports {
        container_port = 8080
        name           = "http1"
      }

      # Note: /health (not /healthz). Cloud Run's frontend reserves /healthz
      # and intercepts it before the request reaches the container. Internal
      # probes still work either way (probe traffic doesn't go through the
      # frontend), but using /health keeps external-curl semantics consistent.
      startup_probe {
        http_get {
          path = "/health"
          port = 8080
        }
        initial_delay_seconds = 5
        timeout_seconds       = 3
        period_seconds        = 5
        failure_threshold     = 6
      }

      liveness_probe {
        http_get {
          path = "/health"
          port = 8080
        }
        initial_delay_seconds = 10
        timeout_seconds       = 3
        period_seconds        = 30
        failure_threshold     = 3
      }
    }
  }

  traffic {
    type    = "TRAFFIC_TARGET_ALLOCATION_TYPE_LATEST"
    percent = 100
  }

  depends_on = [
    google_secret_manager_secret_iam_member.sandbox_url_accessor,
    google_secret_manager_secret_iam_member.sandbox_anon_accessor,
    google_secret_manager_secret_iam_member.sandbox_service_accessor,
  ]

  # CI will push image tags and roll new revisions out-of-band. Keep terraform
  # from undoing those rollouts.
  lifecycle {
    ignore_changes = [
      template[0].containers[0].image,
      client,
      client_version,
    ]
  }
}

# Allow public invocation -- Cloudflare Access is the gate, not Cloud Run auth.
resource "google_cloud_run_v2_service_iam_member" "neuron_sandbox_public" {
  project  = var.project_id
  location = "us-central1"
  name     = google_cloud_run_v2_service.neuron_sandbox.name
  role     = "roles/run.invoker"
  member   = "allUsers"
}

# ── Cloud Run Domain Mapping ─────────────────────────────────────────────────
# Maps sandbox.neurontechnologies.ai → neuron-sandbox-us. Cloud Run handles
# managed cert provisioning via the CNAME pointing to ghs.googlehosted.com.

resource "google_cloud_run_domain_mapping" "sandbox" {
  name     = "sandbox.neurontechnologies.ai"
  location = "us-central1"
  project  = var.project_id

  metadata {
    namespace = var.project_id
    labels    = local.sandbox_labels
  }

  spec {
    route_name = google_cloud_run_v2_service.neuron_sandbox.name
  }
}

# ── Cloudflare DNS — sandbox.neurontechnologies.ai ───────────────────────────
# CNAME to ghs.googlehosted.com. The wildcard A record (*.neurontechnologies.ai
# → LB IP) lives in dns-gcp.tf and would otherwise route sandbox to soma; this
# more specific CNAME wins via DNS specificity at Cloudflare.
#
# Proxied = false: Cloudflare Access works over orange-cloud, but the simpler
# pattern for Cloud Run domain mappings is grey-cloud (DNS-only) so the
# managed cert handshake completes against the Cloud Run frontend. Cloudflare
# Access still applies because the Access app is keyed to the hostname, not
# the proxy mode.
#
# NOTE: For Cloudflare Access to intercept the request we MUST proxy through
# Cloudflare. So proxied = true. The Cloud Run domain mapping issues a Google
# managed cert; Cloudflare's Universal SSL covers the edge. Both certs coexist.

resource "cloudflare_record" "sandbox" {
  zone_id = var.cloudflare_zone_id_neurontechnologies
  name    = "sandbox"
  type    = "CNAME"
  content = "ghs.googlehosted.com"
  proxied = true
  ttl     = 1
}

# ── Cloudflare Zero Trust Access ─────────────────────────────────────────────
# Single application, single policy: allow only email_domain ==
# neurontechnologies.ai. No service tokens. No mTLS. No bypass paths.
#
# auto_redirect_to_identity = true sends users straight to the Google IdP
# without showing the Cloudflare Access selector page.

resource "cloudflare_zero_trust_access_application" "sandbox" {
  zone_id                   = var.cloudflare_zone_id_neurontechnologies
  name                      = "Neuron Sandbox"
  domain                    = "sandbox.neurontechnologies.ai"
  type                      = "self_hosted"
  session_duration          = "8h"
  allowed_idps              = ["808f1913-5a8e-4a97-9e68-8ec58e362110"] # Google
  auto_redirect_to_identity = true
}

resource "cloudflare_zero_trust_access_policy" "sandbox_only_neurontech" {
  application_id = cloudflare_zero_trust_access_application.sandbox.id
  account_id     = var.cloudflare_account_id
  name           = "Allow only @neurontechnologies.ai"
  precedence     = 1
  decision       = "allow"

  include {
    email_domain = ["neurontechnologies.ai"]
  }
}

# ── Outputs ──────────────────────────────────────────────────────────────────

output "sandbox_service_account_email" {
  description = "Sandbox SA email -- has zero prod IAM bindings"
  value       = google_service_account.neuron_sandbox.email
}

output "sandbox_cloud_run_url" {
  description = "Direct Cloud Run URL (NOT the front door -- use sandbox.neurontechnologies.ai via CF Access)"
  value       = google_cloud_run_v2_service.neuron_sandbox.uri
}

output "sandbox_access_application_id" {
  description = "Cloudflare Access application ID for sandbox.neurontechnologies.ai"
  value       = cloudflare_zero_trust_access_application.sandbox.id
}

output "sandbox_access_aud" {
  description = "Cloudflare Access AUD tag (used for JWT verification if app ever needs it)"
  value       = cloudflare_zero_trust_access_application.sandbox.aud
}

output "sandbox_dns_record_id" {
  description = "Cloudflare DNS record ID for sandbox CNAME"
  value       = cloudflare_record.sandbox.id
}