#!/usr/bin/env bash
set -o errexit
set -o nounset
set -o pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
# shellcheck source=00_env.sh
source "$SCRIPT_DIR/00_env.sh"

parse_common_args "$@"
require_inputs sg dg vol mount

missing=0
for cmd in hastatus hagrp hares vxdisk vxdg vxprint df findmnt; do
  require_cmd "$cmd" || missing=1
done

if (( missing != 0 )); then
  exit 2
fi

status=0
ok "Precheck started for service group '$SERVICE_GROUP', diskgroup '$DISKGROUP', volume '$VOLUME'"
log "INFO" "log file: $LOG_FILE"

if hastatus -sum >/dev/null 2>&1; then
  ok "VCS status is available"
else
  critical "VCS does not appear to be running or hastatus failed"
  status=1
fi

if hagrp -display "$SERVICE_GROUP" >/dev/null 2>&1; then
  ok "service group exists: $SERVICE_GROUP"
else
  critical "service group not found: $SERVICE_GROUP"
  status=1
fi

group_state="$(hagrp -state "$SERVICE_GROUP" 2>/dev/null || true)"
printf '%s\n' "$group_state" | tee -a "$LOG_FILE"
if printf '%s\n' "$group_state" | grep -qi "ONLINE"; then
  ok "service group is online"
else
  critical "service group is not online"
  status=1
fi

online_node="$(printf '%s\n' "$group_state" | awk '/ONLINE/ {print $NF; exit}')"
if [[ -n "$online_node" ]]; then
  ok "possible online node: $online_node"
else
  warning "unable to identify online node from hagrp output"
fi

if vxdg list "$DISKGROUP" >/dev/null 2>&1; then
  ok "diskgroup exists: $DISKGROUP"
else
  critical "diskgroup not found: $DISKGROUP"
  status=1
fi

if vxprint -g "$DISKGROUP" "$VOLUME" >/dev/null 2>&1; then
  ok "volume exists: $VOLUME"
else
  critical "volume not found in diskgroup: $VOLUME"
  status=1
fi

if findmnt --target "$MOUNTPOINT" >/dev/null 2>&1; then
  ok "mountpoint is mounted: $MOUNTPOINT"
  fs_type="$(findmnt --noheadings --output FSTYPE --target "$MOUNTPOINT" | awk 'NR == 1 {print $1}')"
  ok "filesystem type: ${fs_type:-unknown}"
else
  critical "mountpoint is not mounted: $MOUNTPOINT"
  status=1
fi

capture_cmd "Current filesystem usage" df -h "$MOUNTPOINT" || status=1
capture_cmd "Current VxVM layout" vxprint -g "$DISKGROUP" -ht || status=1
capture_cmd "Current VCS service group display" hagrp -display "$SERVICE_GROUP" || status=1
if hares -display 2>/dev/null | grep -F "$SERVICE_GROUP" | tee -a "$LOG_FILE"; then
  ok "displayed VCS resources related to service group: $SERVICE_GROUP"
else
  warning "no VCS resource display rows matched service group: $SERVICE_GROUP"
fi

if (( status == 0 )); then
  ok "precheck completed successfully"
else
  critical "precheck found one or more issues"
fi

exit "$status"