#!/usr/bin/env bash

# Usage: call this script with the patch file as first argument, its initial
# environment number and the environments numbers on which it should be applied
# as following args.

#  Example of using add-hack-module.patch, which was written for env v3,
#  on envs 9 and 10:
#  devtools/patchs/apply_env_patch.sh  devtools/protocol-print/add-hack-module.patch 3 9 10

# Hack to get tezos directory
TEZOS_DIR=$(dirname "$0")/../..

# Patch file, with absolute path
PATCH=$(pwd)/$1
if [ ! -f "$PATCH" ]; then
  echo "Patch file $PATCH doesn't exist"
  exit 1
fi
PATCH_BASE=$(basename "$PATCH")
PATCHS_PATH=$(dirname "$PATCH")

# environement on witch the patch was build
BASE_ENV_NUMBER=$2

# Removing patch file and base env from arg list, only target env numbers should remain.
shift 2

# For each env directory, translate the patch and apply it.
for env in "$@"; do
  if [[ $env =~ [1-9][0-9]* ]]; then
    echo "applying patch $PATCH replacing environment version $BASE_ENV_NUMBER by $env"
    sed "s/$BASE_ENV_NUMBER/$env/g" "$PATCH" > "$PATCHS_PATH/${env}_${PATCH_BASE}"
    cd "$TEZOS_DIR" || exit 1
    patch -p1 < "${PATCHS_PATH}/${env}_${PATCH_BASE}"
    cd - || exit 1
  else
    echo "ignoring $env; not an environment number"
  fi
done