Add reverse date order to fetch-year script

scripts/fetch-year.sh

@@ -0,0 +1,101 @@
+#!/usr/bin/env bash
+# Usage: ./scripts/fetch-year.sh YEAR [--reverse]
+# Fetches sequentially; prints JSON responses to stdout and errors to stderr.
+set -euo pipefail
+
+reverse=false
+year=
+for arg in "$@"; do
+  case "$arg" in
+    --reverse) reverse=true ;;
+    *)
+      if [[ -n $year ]]; then
+        echo "Usage: $0 YEAR [--reverse]" >&2
+        exit 1
+      fi
+      year=$arg
+      ;;
+  esac
+done
+if [[ -z $year ]]; then
+  echo "Usage: $0 YEAR [--reverse]" >&2
+  exit 1
+fi
+if [[ ! $year =~ ^[0-9]{4}$ || $year == 0000 ]]; then
+  echo "YEAR must be a four-digit year from 0001 to 9999." >&2
+  exit 1
+fi
+
+year_number=$((10#$year))
+days_in_month=(31 28 31 30 31 30 31 31 30 31 30 31)
+if (( year_number % 400 == 0 || (year_number % 4 == 0 && year_number % 100 != 0) )); then
+  days_in_month[1]=29
+fi
+
+# Reuse a reachable service, or keep a port-forward alive while fetching.
+service_ready() {
+  curl --fail --silent --output /dev/null --connect-timeout 1 --max-time 2 \
+    'http://localhost:4101/api/health'
+}
+
+forward_pid=
+cleanup() {
+  if [[ -n $forward_pid ]]; then
+    kill "$forward_pid" 2>/dev/null || true
+    wait "$forward_pid" 2>/dev/null || true
+  fi
+}
+trap cleanup EXIT
+trap 'exit 130' INT
+trap 'exit 143' TERM
+
+if ! service_ready; then
+  if ! command -v kubectl >/dev/null 2>&1; then
+    echo "Service unavailable on localhost:4101 and kubectl is not installed." >&2
+    exit 1
+  fi
+  echo "Starting kubectl port-forward for sejs/btcdata..." >&2
+  kubectl -n sejs port-forward svc/btcdata 4101:4101 >&2 &
+  forward_pid=$!
+
+  ready=false
+  for (( attempt = 0; attempt < 30; attempt++ )); do
+    if ! kill -0 "$forward_pid" 2>/dev/null; then
+      echo "Port-forward exited before the service became ready." >&2
+      exit 1
+    fi
+    if service_ready; then
+      ready=true
+      break
+    fi
+    sleep 1
+  done
+  if [[ $ready != true ]]; then
+    echo "Timed out waiting for the service on localhost:4101." >&2
+    exit 1
+  fi
+fi
+
+# Generate dates without relying on platform-specific date command options.
+status=0
+for (( month_index = 0; month_index < 12; month_index++ )); do
+  month=$((month_index + 1))
+  if [[ $reverse == true ]]; then
+    month=$((12 - month_index))
+  fi
+  days=${days_in_month[month - 1]}
+  for (( day_index = 0; day_index < days; day_index++ )); do
+    day=$((day_index + 1))
+    if [[ $reverse == true ]]; then
+      day=$((days - day_index))
+    fi
+    printf -v date '%s-%02d-%02d' "$year" "$month" "$day"
+    if ! curl --fail --silent --show-error -X GET \
+      "http://localhost:4101/api/price/day/$date" \
+      -H "accept: application/json" --write-out '\n'; then
+      echo "Failed to fetch $date" >&2
+      status=1
+    fi
+  done
+done
+exit "$status"