#!/bin/sh
set -eu

mysql_args="--host=mysql --user=${MYSQL_USER} --database=${MYSQL_DATABASE} --default-character-set=utf8mb4 --batch --skip-column-names"

until MYSQL_PWD="${MYSQL_PASSWORD}" mysql ${mysql_args} --execute "SELECT 1" >/dev/null 2>&1; do
  sleep 2
done

MYSQL_PWD="${MYSQL_PASSWORD}" mysql ${mysql_args} --execute "CREATE TABLE IF NOT EXISTS schema_migrations (version VARCHAR(255) NOT NULL PRIMARY KEY, checksum CHAR(64) NOT NULL, applied_at DATETIME(3) NOT NULL DEFAULT CURRENT_TIMESTAMP(3)) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4"

for file in /migrations/*.sql; do
  version="$(basename "${file}")"
  checksum="$(sha256sum "${file}" | awk '{print $1}')"
  existing="$(MYSQL_PWD="${MYSQL_PASSWORD}" mysql ${mysql_args} --execute "SELECT checksum FROM schema_migrations WHERE version='${version}'" 2>/dev/null || true)"
  if [ -n "${existing}" ]; then
    if [ "${existing}" != "${checksum}" ]; then
      echo "Migration checksum mismatch: ${version}" >&2
      exit 1
    fi
    echo "Already applied: ${version}"
    continue
  fi
  echo "Applying: ${version}"
  MYSQL_PWD="${MYSQL_PASSWORD}" mysql ${mysql_args} < "${file}"
  MYSQL_PWD="${MYSQL_PASSWORD}" mysql ${mysql_args} --execute "INSERT INTO schema_migrations(version,checksum) VALUES('${version}','${checksum}')"
done