#!/bin/bash
set -e

DEPLOY_HOME="/home/kjh2064"
PORT_FILE="$DEPLOY_HOME/taxbaik_port"
TIMESTAMP=$(TZ=Asia/Seoul date +%Y%m%d_%H%M%S)

echo "===== 🚀 TaxBaik Green/Blue Deployment Script ====="

if [ "${TAXBAIK_DEPLOY_FROM_CI:-}" != "1" ]; then
  echo "❌ This deployment script may only be run from CI." >&2
  exit 1
fi

# 1. Determine active port
ACTIVE_PORT=5003
if [ -f "$PORT_FILE" ]; then
  ACTIVE_PORT=$(cat "$PORT_FILE" | tr -d '[:space:]')
fi

# 2. Determine target port
TARGET_PORT=5003
if [ "$ACTIVE_PORT" -eq 5003 ]; then
  TARGET_PORT=5004
else
  TARGET_PORT=5003
fi

echo "Active Port: $ACTIVE_PORT"
echo "Target Port: $TARGET_PORT"

# 3. New deploy dir is passed as first argument
DEPLOY_DIR="$1"
if [ -z "$DEPLOY_DIR" ]; then
  echo "Error: Deployment directory argument required"
  exit 1
fi

echo "Deploy Directory: $DEPLOY_DIR"

if [ ! -s "$DEPLOY_DIR/appsettings.Production.json" ]; then
  echo "❌ Missing production settings: $DEPLOY_DIR/appsettings.Production.json" >&2
  exit 1
fi

if [ ! -s "$DEPLOY_DIR/proxy/TaxBaik.Proxy.dll" ]; then
  echo "❌ Missing proxy artifact: $DEPLOY_DIR/proxy/TaxBaik.Proxy.dll" >&2
  exit 1
fi

# 0. Ensure the local TCP proxy exists and is running.
# Nginx and external traffic always enter through 127.0.0.1:5001.
if ! ss -tln | grep -q ':5001 '; then
  echo "=== Starting proxy on 127.0.0.1:5001 ==="
  cd "$DEPLOY_DIR/proxy"
  nohup /usr/bin/dotnet TaxBaik.Proxy.dll > "$DEPLOY_HOME/taxbaik_proxy.log" 2>&1 &
  sleep 2
fi

if ! ss -tln | grep -q ':5001 '; then
  echo "❌ Proxy on 127.0.0.1:5001 is not running. Abort deploy." >&2
  exit 1
fi

# 4. Start the new app on the target port
echo "=== Starting New App on Port $TARGET_PORT ==="
cd "$DEPLOY_DIR"
export ASPNETCORE_ENVIRONMENT=Production
export ASPNETCORE_URLS="http://127.0.0.1:$TARGET_PORT"

# Run dotnet process
nohup /usr/bin/dotnet TaxBaik.Web.dll > "web_${TARGET_PORT}.log" 2>&1 &
NEW_PID=$!
sleep 2

# Verify process is running
if ! ps -p $NEW_PID > /dev/null; then
  echo "❌ Failed to start dotnet process on port $TARGET_PORT"
  exit 1
fi

# 5. Health Check Loop
echo "=== Health Checking Port $TARGET_PORT ==="
ATTEMPTS=20
SUCCESS=false
for i in $(seq 1 $ATTEMPTS); do
  STATUS=$(curl -sf -o /dev/null -w '%{http_code}' "http://127.0.0.1:${TARGET_PORT}/taxbaik/healthz" 2>/dev/null || echo "000")
  if [ "$STATUS" = "200" ]; then
    echo "✓ Health check passed on port $TARGET_PORT (Attempt $i/$ATTEMPTS)"
    SUCCESS=true
    break
  fi
  echo "  Waiting for health check... ($i/$ATTEMPTS, Status: $STATUS)"
  sleep 2
done

if [ "$SUCCESS" = "false" ]; then
  echo "❌ Health check failed. Rolling back..."
  kill -9 $NEW_PID || true
  exit 1
fi

# 6. Switch Traffic
echo "=== Switching Traffic to Port $TARGET_PORT ==="
echo "$TARGET_PORT" > "$PORT_FILE"
echo "✓ Traffic routed to $TARGET_PORT"

# 7. Terminate Old App
echo "=== Stopping Old App on Port $ACTIVE_PORT ==="
# Find PID listening on ACTIVE_PORT
OLD_PID=$(ss -tlnp | grep ":$ACTIVE_PORT " | grep -oP 'pid=\K\d+' | head -n1)
if [ -n "$OLD_PID" ]; then
  echo "Killing old process PID: $OLD_PID"
  kill -15 $OLD_PID || kill -9 $OLD_PID
  echo "✓ Old process terminated"
else
  echo "No old process found on port $ACTIVE_PORT"
fi

# 8. Cleanup old deployment directories (Keep last 5)
echo "=== Cleaning Up Old Deployments ==="
ls -1dt $DEPLOY_HOME/deployments/taxbaik_* 2>/dev/null | tail -n +6 | xargs rm -rf 2>/dev/null || true
echo "✓ Cleanup completed"

echo "===== ✅ Green/Blue Deployment Completed Successfully ====="
