#!/usr/bin/env bash
set -eo pipefail

readonly SCRIPT="${BASH_SOURCE[0]}"

fail() {
  printf "ERR - %s: %s\n" "$SCRIPT" "$1" >&2
  exit 1
}

DIR="${1:-$(pwd)}"

if [[ ! -d "$DIR" ]]; then
  printf "Usage: %s <Project Directory>\n" "$SCRIPT"
  exit 1
fi

(
  cd "$DIR" || fail "Couldn't enter directory: $DIR"

  if [[ -x "./run.sh" ]]; then
    ./run.sh || fail "run.sh failed"
    
  elif [[ -f "Cargo.toml" ]]; then
    cargo run || fail "Cargo execution failed"
    
  elif [[ -f "Makefile" ]]; then
    EXEC=$(awk -F '=' '/^TARGET[[:space:]]*=/ {print $2}' Makefile | xargs)
    
    if [[ -z "$EXEC" ]]; then
      fail "Makefile found, but no 'TARGET' variable defined."
    fi
    
    make && ./"$EXEC" || fail "Make build or execution failed"
  else
    fail "No recognized entry point (run.sh, Cargo.toml, or Makefile) found."
  fi
)