#! /bin/bash

set -e

source ./scripts/env.sh ./.env.schema

rev=$(echo "$1" | xargs)
head=$(git show --format=format:%h -q | xargs)
migration="./migrations/${rev}_to_${head}.sql"

head_url=postgresql://$POSTGRES_USER:$POSTGRES_PASSWORD@localhost:5432/dnim
base_url=postgresql://$POSTGRES_USER:$POSTGRES_PASSWORD@localhost:5433/dnim

if [[ -z "$rev" ]]; then
  echo "revision to diff is required" 1>&2;
  exit 1;
fi

docker compose up -d 1>&2

rm -r ./migrations || true
git fetch --all 1>&2
git restore ./migrations --source origin/manual_migrations 1>&2

if [[ ! -f "$migration" ]]; then
  ./scripts/build.sh "$rev" 1>&2
  ./scripts/build.sh HEAD 1>&2
  
  echo "migrate from $rev => HEAD" 1>&2

  echo "do language plpgsql \$migration\$" >> "$migration"
  echo "begin" >> "$migration"
  echo >> "$migration"
  migra --unsafe $base_url $head_url >> "$migration" \
    || echo "migra exited with code $?. this is /probably/ fine" 1>&2
  echo >> "$migration"
  echo "end;" >> "$migration"
  echo '$migration$;' >> "$migration"
fi

echo "$migration"

docker compose down 1>&2