#!/usr/bin/env bash
# build-oracle-ef.sh — generate the EF (1962) regression oracle by fetching
# missalemeum's per-date proper API (the same source lectio's trad scraper uses,
# built on Divinum Officium data) for 2025-2026.
#
# NOT run by `go test`. Requires network + curl + jq + GNU date. From repo root:
#   scripts/build-oracle-ef.sh
# Writes internal/calendar/testdata/oracle-ef.json:
#   { "YYYY-MM-DD": {"tempora": "...", "title": "...", "rank": N, "colour": "w"} }
# tempora is "" when missalemeum returns null (then the temporal identity is in
# title); the Go test derives the season from tempora-or-title.
set -euo pipefail

out=internal/calendar/testdata/oracle-ef.json
mkdir -p "$(dirname "$out")"
work=$(mktemp -d)

for y in 2025 2026; do
  d="$y-01-01"
  while [ "$(date -d "$d" +%Y)" = "$y" ]; do
    echo "$d"
    d=$(date -d "$d +1 day" +%F)
  done
done > "$work/dates"

fetch() {
  local d="$1"
  local j
  j=$(curl -sf "https://www.missalemeum.com/en/api/v5/proper/$d" || true)
  printf '%s' "$j" | jq -c --arg d "$d" \
    '{($d): (.[0].info | {tempora:(.tempora // ""), title:.title, rank:.rank, colour:(.colors|join(""))})}' \
    2>/dev/null || true
}
export -f fetch

xargs -P 12 -I{} bash -c 'fetch "$@"' _ {} < "$work/dates" | jq -s 'add' > "$out"
echo "wrote $out ($(jq 'length' "$out") days)" >&2
rm -rf "$work"