#! /bin/bash

set -e

source ./scripts/common.sh

revs=$(git log --format=%h | tac)
first_commit="7371374"
first_commit_n=$(echo "$revs" | grep -n "$first_commit" | awk -F: '{print $1}')
revs=$(echo "empty" && (echo "$revs" | tail --lines "+$first_commit_n"))
revs_ct=$(echo "$revs" | wc -l)

do_i() {
  base=$(echo "$revs" | tail --lines "+$1" | head -n 1)
  if [[ -f "./migrations/${base}_skipped.sql" ]]; then
    echo "skip $base"
    return
  fi

  for j in $(seq "$(($1 + 1))" "$revs_ct"); do
    head=$(echo "$revs" | tail --lines "+$j" | head -n 1)
    migration="./migrations/${base}_to_${head}.sql"
    echo "building $migration..."

    set +e
    out=$(./scripts/diff.sh "$base" "$head")
    status="$?"
    set -e

    if [[ "$status" = "1" && "$out" = *"head failed to build"* ]]; then
      echo "" > "./migrations/${head}_skipped.sql"
      echo "wrote ./migrations/${head}_skipped.sql"
      continue
    elif [[ "$status" = "1" ]]; then
      echo "$out"
      exit 1
    else
      echo "$out" > "$migration"
      echo "wrote $migration"
      break
    fi
  done
}

for i in $(seq 1 "$revs_ct"); do
  do_i "$i"
done