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

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

exit_code=0

section "Disk Space Overview"
if require_cmd df; then
  df -h 2>&1 | tee -a "$LOG_FILE"
else
  critical "df is required for disk overview"
  exit 1
fi

section "Inode Overview"
df -i 2>&1 | tee -a "$LOG_FILE" || warning "Unable to collect inode usage"

section "Filesystems Sorted By Usage"
df -P -h | awk 'NR == 1 { next } { print $5, $6, $1, $2, $3, $4 }' | sort -rn | while read -r used mount fs size used_space avail; do
  percent="$(usage_percent_number "$used")"
  level="$(status_for_percent "$percent")"
  printf '%s: %s used on %s (%s, size=%s used=%s avail=%s)\n' "$level" "$used" "$mount" "$fs" "$size" "$used_space" "$avail" | tee -a "$LOG_FILE"
done

section "Threshold Summary"
while read -r fs size used avail pct mount; do
  percent="$(usage_percent_number "$pct")"
  level="$(status_for_percent "$percent")"

  if (( percent >= EMERGENCY_THRESHOLD )); then
    critical "$mount is ${pct} full on $fs (size=$size used=$used avail=$avail)"
    exit_code=1
  elif (( percent >= CRIT_THRESHOLD )); then
    warning "$mount is ${pct} full on $fs (size=$size used=$used avail=$avail)"
  elif (( percent >= WARN_THRESHOLD )); then
    warning "$mount is ${pct} full on $fs (size=$size used=$used avail=$avail)"
  else
    ok "$mount is ${pct} full on $fs"
  fi
done < <(df -P -h | awk 'NR > 1 { print $1, $2, $3, $4, $5, $6 }')

exit "$exit_code"