#!/usr/bin/env bash
set -euo pipefail

# ── helpers ──────────────────────────────────────────────────────────
RED='\033[0;31m'; GREEN='\033[0;32m'; YELLOW='\033[1;33m'; NC='\033[0m'
log()  { echo -e "${GREEN}[OK]${NC}  $*"; }
warn() { echo -e "${YELLOW}[WARN]${NC} $*"; }
err()  { echo -e "${RED}[ERR]${NC} $*"; exit 1; }

command_exists() { command -v "$1" &>/dev/null; }

# ── defaults ─────────────────────────────────────────────────────────
NAMESPACE="${NAMESPACE:-app}"
RELEASE="${RELEASE:-deploy}"
CHART_DIR="${CHART_DIR:-./deploy}"
REGISTRY="${REGISTRY:-harbor.gitdata.me/gtateam}"
TAG="${TAG:-$(git rev-parse --short HEAD)}"
CONFIG_MAP="${CONFIG_MAP:-app-env}"
PVC_NAME="${PVC_NAME:-shared-data}"

# ── prerequisites ────────────────────────────────────────────────────
command_exists helm   || err "helm not found — install via https://helm.sh/docs/intro/install/"
command_exists kubectl || err "kubectl not found — install via https://kubernetes.io/docs/tasks/tools/"

log "helm $(helm version --short)"
log "kubectl $(kubectl version --client --short 2>/dev/null || kubectl version -o json 2>/dev/null | grep gitVersion)"

# ── 1. Ensure namespace (not managed by Helm — preserved on uninstall) ──
log "Ensuring namespace $NAMESPACE exists..."
kubectl create namespace "$NAMESPACE" --dry-run=client -o yaml | kubectl apply -f -

# ── 2. Ensure prerequisites ─────────────────────────────────────────
# Namespace must exist (not managed by Helm)
if ! kubectl get namespace "$NAMESPACE" &>/dev/null; then
    err "Namespace '$NAMESPACE' not found — create it first: kubectl create namespace $NAMESPACE"
fi

# ConfigMap (must exist before Helm install)
if ! kubectl get configmap "$CONFIG_MAP" -n "$NAMESPACE" &>/dev/null; then
    err "ConfigMap '$CONFIG_MAP' not found in namespace '$NAMESPACE' — create it first"
fi

# PVC (must exist before Helm install)
if ! kubectl get pvc "$PVC_NAME" -n "$NAMESPACE" &>/dev/null; then
    err "PVC '$PVC_NAME' not found in namespace '$NAMESPACE' — create it first"
fi

# cert-manager ClusterIssuer
if ! kubectl get clusterissuer letsencrypt-prod &>/dev/null; then
    warn "ClusterIssuer 'letsencrypt-prod' not found — TLS certificate issuance will fail"
fi

log "Prerequisites verified"

# ── 3. Lint chart ────────────────────────────────────────────────────
log "Linting Helm chart..."
helm lint "$CHART_DIR" || err "Helm lint failed"

# ── 4. Deploy ────────────────────────────────────────────────────────
log "Deploying release $RELEASE with tag $TAG..."

helm upgrade --install "$RELEASE" "$CHART_DIR" \
    --namespace "$NAMESPACE" \
    --set imageRegistry="$REGISTRY" \
    --set imageTag="$TAG" \
    --set configMapName="$CONFIG_MAP" \
    --set pvcName="$PVC_NAME" \
    --wait \
    --timeout 5m

log "Release $RELEASE deployed successfully"

# ── 5. Verify ────────────────────────────────────────────────────────
log "Checking deployment status..."
kubectl get deployments -n "$NAMESPACE" -l app.kubernetes.io/instance="$RELEASE"
kubectl get pods -n "$NAMESPACE" -l app.kubernetes.io/instance="$RELEASE"
kubectl get services -n "$NAMESPACE" -l app.kubernetes.io/instance="$RELEASE"
kubectl get ingress -n "$NAMESPACE"

log "Deployment complete"