# Observability Module
# Provides unified logging, metrics, and tracing across all environments

locals {
  environments = var.environments
  global_config = var.global_config
  clusters = var.clusters
  
  # Extract observability config
  obs_config = try(local.global_config, {})
  logging_config = try(local.obs_config.logging, {})
  metrics_config = try(local.obs_config.metrics, {})
  tracing_config = try(local.obs_config.tracing, {})
}

# ============================================
# LOGGING CONFIGURATION
# ============================================
# Generate logging configuration per environment
resource "local_file" "logging_config" {
  for_each = local.clusters
  
  filename = "${path.module}/../../../../config/observability/logging-${each.key}.yaml"
  content = yamlencode({
    cluster = each.key
    provider = try(local.logging_config.provider, "loki")
    endpoint = try(local.logging_config.central_endpoint, "")
    config = {
      loki = {
        url = try(local.logging_config.central_endpoint, "http://loki:3100")
        labels = {
          cluster = each.key
          provider = try(local.environments[each.key].provider, "unknown")
        }
      }
      elasticsearch = {
        url = try(local.logging_config.central_endpoint, "")
        index = "besu-network-${each.key}"
      }
    }
  })
}

# ============================================
# METRICS CONFIGURATION
# ============================================
# Generate Prometheus/metrics configuration
resource "local_file" "metrics_config" {
  for_each = local.clusters
  
  filename = "${path.module}/../../../../config/observability/metrics-${each.key}.yaml"
  content = yamlencode({
    cluster = each.key
    provider = try(local.metrics_config.provider, "prometheus")
    endpoint = try(local.metrics_config.central_endpoint, "")
    scrape_configs = [
      {
        job_name = "besu-validators"
        kubernetes_sd_configs = [{
          role = "pod"
        }]
        relabel_configs = [{
          source_labels = ["__meta_kubernetes_pod_label_role"]
          action = "keep"
          regex = "validator"
        }]
      },
      {
        job_name = "besu-rpc"
        kubernetes_sd_configs = [{
          role = "pod"
        }]
        relabel_configs = [{
          source_labels = ["__meta_kubernetes_pod_label_role"]
          action = "keep"
          regex = "rpc"
        }]
      }
    ]
  })
}

# ============================================
# TRACING CONFIGURATION
# ============================================
# Generate tracing configuration
resource "local_file" "tracing_config" {
  for_each = local.clusters
  
  filename = "${path.module}/../../../../config/observability/tracing-${each.key}.yaml"
  content = yamlencode({
    cluster = each.key
    provider = try(local.tracing_config.provider, "jaeger")
    endpoint = try(local.tracing_config.central_endpoint, "")
    config = {
      jaeger = {
        agent_host = try(split(":", local.tracing_config.central_endpoint)[0], "jaeger")
        agent_port = try(split(":", local.tracing_config.central_endpoint)[1], "6831")
      }
      zipkin = {
        url = try(local.tracing_config.central_endpoint, "http://zipkin:9411")
      }
    }
  })
}

# ============================================
# GRAFANA DASHBOARDS
# ============================================
# Generate Grafana dashboard configuration
resource "local_file" "grafana_dashboards" {
  filename = "${path.module}/../../../../config/observability/grafana-dashboards.yaml"
  content = yamlencode({
    dashboards = {
      for name, cluster in local.clusters : name => {
        title = "Besu Network - ${name}"
        panels = [
          {
            title = "Block Production Rate"
            targets = [
              {
                expr = "rate(besu_blockchain_blocks_added_total[5m])"
                legendFormat = "{{cluster}}"
              }
            ]
          },
          {
            title = "Validator Health"
            targets = [
              {
                expr = "besu_validator_health"
                legendFormat = "{{validator}}"
              }
            ]
          },
          {
            title = "RPC Requests"
            targets = [
              {
                expr = "rate(besu_rpc_requests_total[5m])"
                legendFormat = "{{method}}"
              }
            ]
          }
        ]
      }
    }
  })
}