#!/usr/bin/env sh
# DEP-03: postgres and sqlite migration sets must have matching numbered pairs.
set -eu

ROOT="$(CDPATH= cd -- "$(dirname "$0")/.." && pwd)"
PG="$ROOT/migrations/postgres"
SQL="$ROOT/migrations/sqlite"

list_nums() {
  dir="$1"
  ls "$dir" 2>/dev/null | sed -n 's/^\([0-9]\{6\}\)_.*\.up\.sql$/\1/p' | sort -u
}

pg_nums="$(list_nums "$PG")"
sql_nums="$(list_nums "$SQL")"

if [ "$pg_nums" != "$sql_nums" ]; then
  echo "check-migrations-pair: postgres and sqlite migration numbers differ" >&2
  echo "postgres only:" >&2
  comm -23 <(printf '%s\n' "$pg_nums") <(printf '%s\n' "$sql_nums") >&2 || true
  echo "sqlite only:" >&2
  comm -13 <(printf '%s\n' "$pg_nums") <(printf '%s\n' "$sql_nums") >&2 || true
  exit 1
fi

for n in $pg_nums; do
  pg_up="$(ls "$PG"/${n}_*.up.sql 2>/dev/null | head -1)"
  sql_up="$(ls "$SQL"/${n}_*.up.sql 2>/dev/null | head -1)"
  if [ -z "$pg_up" ] || [ -z "$sql_up" ]; then
    echo "check-migrations-pair: missing .up.sql for $n" >&2
    exit 1
  fi
  pg_base="$(basename "$pg_up" .up.sql)"
  sql_base="$(basename "$sql_up" .up.sql)"
  if [ "$pg_base" != "$sql_base" ]; then
    echo "check-migrations-pair: name mismatch for $n: $pg_base vs $sql_base" >&2
    exit 1
  fi
done

echo "check-migrations-pair: ok ($PG and $SQL)"