#!/bin/bash
# =============================================================================
# SAP HANA Process Monitoring Script
# Checks if all HANA processes are in GREEN state
# =============================================================================

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" &>/dev/null && pwd)"
SCRIPT_NAME="hana_processes"

# Load configuration
source "${SCRIPT_DIR}/hana.conf"
source "${SCRIPT_DIR}/hana_lib.sh"

# Acquire lock
LOCK_FILE=$(acquire_lock "$SCRIPT_NAME")
if [ $? -ne 0 ]; then
    exit 1
fi
trap 'release_lock "$LOCK_FILE"' EXIT

log_message "$SCRIPT_NAME" "Starting HANA process status check..."

# Check if sapcontrol is available
if [ ! -x "$SAPCONTROL_PATH" ]; then
    log_message "$SCRIPT_NAME" "ERROR: sapcontrol not found or not executable at ${SAPCONTROL_PATH}"
    send_notification_if_changed "$SCRIPT_NAME" "hana_sapcontrol_path" "HANA Monitor Error" "sapcontrol not found or not executable at ${SAPCONTROL_PATH}" "true" "SAPCONTROL_ERROR"
    exit 1
fi

# Get process list with improved error handling
process_list=$(su - "$HANA_USER" -c "${SAPCONTROL_PATH} -nr ${HANA_INSTANCE_NR} -function GetProcessList" 2>&1)
sapcontrol_status=$?

if [ $sapcontrol_status -ne 0 ]; then
    log_message "$SCRIPT_NAME" "ERROR: sapcontrol command failed with exit code ${sapcontrol_status}"
    send_notification_if_changed "$SCRIPT_NAME" "hana_sapcontrol_command" "HANA Monitor Error" "sapcontrol command failed. Exit code: ${sapcontrol_status}" "true" "SAPCONTROL_COMMAND_FAILED"
    exit 1
fi

# Clear any previous sapcontrol error state
send_notification_if_changed "$SCRIPT_NAME" "hana_sapcontrol_command" "HANA Process" "sapcontrol command successful." "false" "OK"

# Check for non-GREEN processes (skip header lines)
non_green_processes=$(echo "$process_list" | tail -n +6 | grep -v 'GREEN' | grep -v '^$')

if [ -n "$non_green_processes" ]; then
    log_message "$SCRIPT_NAME" "ALERT: One or more HANA processes are not running!"
    log_message "$SCRIPT_NAME" "Problem processes: ${non_green_processes}"
    send_notification_if_changed "$SCRIPT_NAME" "hana_processes" "HANA Process" "One or more HANA processes are not GREEN. Problem processes: ${non_green_processes}" "true" "PROCESS_ALERT:${non_green_processes}"
    exit 1
else
    # Verify we actually got process data
    green_processes=$(echo "$process_list" | tail -n +6 | grep 'GREEN')
    if [ -z "$green_processes" ]; then
        log_message "$SCRIPT_NAME" "WARNING: No process data found. SAP HANA may not be running."
        send_notification_if_changed "$SCRIPT_NAME" "hana_processes" "HANA Process" "No process data found. SAP HANA may not be running." "true" "NO_PROCESS_DATA"
        exit 1
    fi
    
    send_notification_if_changed "$SCRIPT_NAME" "hana_processes" "HANA Process" "All HANA processes are GREEN." "false" "OK"
    log_message "$SCRIPT_NAME" "SUCCESS: All HANA processes are GREEN."
fi

log_message "$SCRIPT_NAME" "Process check complete."