#!/usr/bin/env bash

set -e

# Ensure the ~/.local/bin directory exists so we can download things into it.
LOCAL_BIN="$HOME/.local/bin"
mkdir -p "$LOCAL_BIN"

# A helper function to download an architecture-dependent AppImage and install
# it in ~/.local/bin.
#
# Usage:
#   download_appimage $BINARY_NAME $DOWNLOAD_URL_BASE
#
# Args:
#   BINARY_NAME:       The name of the AppImage-bundled binary we want to
#                      download, e.g.: "appimagetool".
#   DOWNLOAD_URL_BASE: The URL to the directory containing the architecture-
#                      specific AppImages.
download_appimage() {
  BINARY_NAME="$1"
  DOWNLOAD_URL_BASE="$2"

  APPIMAGE_NAME="$BINARY_NAME-$(uname -m).AppImage"

  if [ -x "$(which "$BINARY_NAME")" ]; then
    echo "✅ Found $BINARY_NAME on your PATH."
  elif [ -x "$(which "$APPIMAGE_NAME")" ]; then
    APPIMAGE_PATH="$(which "$APPIMAGE_NAME")"
    APPIMAGE_PARENT_DIR="$(dirname "$APPIMAGE_PATH")"
    # Create a symlink so we can invoke it like a normal binary.
    ln -s "$APPIMAGE_PATH" "$APPIMAGE_PARENT_DIR/$BINARY_NAME"
    echo "✅ Found $APPIMAGE_NAME on your PATH; added $BINARY_NAME symlink."
  else
    echo "⬇️  Downloading $APPIMAGE_NAME..."
    APPIMAGE_PATH="$LOCAL_BIN/$APPIMAGE_NAME"
    curl -fL "$DOWNLOAD_URL_BASE/$APPIMAGE_NAME" --output "$APPIMAGE_PATH"
    chmod +x "$APPIMAGE_PATH"
    # Create a symlink so we can invoke it like a normal binary.
    ln -s "$APPIMAGE_PATH" "$LOCAL_BIN/$BINARY_NAME"
  fi
}

# Install linuxdeploy, a helper for constructing an AppDir (and then invoking
# appimagetool).
download_appimage "linuxdeploy" "https://github.com/linuxdeploy/linuxdeploy/releases/download/1-alpha-20240109-1/"

if [ ! -x "$(which linuxdeploy)" ]; then
  echo -e "⚠️  ${red}Please make sure that \"$LOCAL_BIN\" is on your PATH, otherwise some scripts may not work.${reset}"
fi