#! /usr/bin/env bash

set -euo pipefail

#### Detect Toolkit Project Root ####
# if realpath is not available, create a semi-equivalent function
command -v realpath >/dev/null 2>&1 || realpath() {
  [[ $1 = /* ]] && echo "$1" || echo "$PWD/${1#./}"
}
SCRIPT_PATH="$(realpath "${BASH_SOURCE[0]}")"
SCRIPT_DIR="$(dirname "$SCRIPT_PATH")"
TOOLKIT_ROOT="$(realpath "$SCRIPT_DIR/..")"
if [[ ! -d "$TOOLKIT_ROOT/bin" ]] || [[ ! -d "$TOOLKIT_ROOT/config" ]]; then
  echo "ERROR: could not find root of overleaf-toolkit project (inferred project root as '$TOOLKIT_ROOT')"
  exit 1
fi

function usage() {
    echo "Usage: bin/init"
    echo ""
    echo "Initialises local configuration files in the 'config/' directory"
    echo ""
}

function check_existing_config() {
    if [[ -f "$TOOLKIT_ROOT/config/overleaf.rc" ]] \
        || [[ -f "$TOOLKIT_ROOT/config/variables.env" ]] \
        || [[ -f "$TOOLKIT_ROOT/config/version" ]]; then
        echo "ERROR: Config files already exist, exiting "
        exit 1
    fi
}

function set_up_config_files() {
    echo "Copying config files to 'config/'"
    cp "$TOOLKIT_ROOT/lib/config-seed/overleaf.rc" "$TOOLKIT_ROOT/config/"
    cp "$TOOLKIT_ROOT/lib/config-seed/variables.env" "$TOOLKIT_ROOT/config/"
    cp "$TOOLKIT_ROOT/lib/config-seed/version" "$TOOLKIT_ROOT/config/"
}

function __main__() {
    if [[ "${1:-null}" == "help" ]] || [[ "${1:-null}" == "--help" ]]; then
        usage
        exit
    fi
    check_existing_config
    set_up_config_files
}

__main__ "$@"