#!/bin/bash
#
# Purpose: Download and install pre-built binaries from binaries.conf

CONF_FILE="${HAMPACK_BINARIES_CONF:-$HOME/.local/share/HamPack/binaries.conf}"
TMP_DIR="/tmp/hampack-build"
VERSION_FILE="$HOME/.local/state/HamPack/.installed_versions"

# Get the installed version of an app
get_installed_version() {
  local app="$1"

  if [ -f "$VERSION_FILE" ]; then
    local stored
    stored=$(grep "^$app=" "$VERSION_FILE" | cut -d'=' -f2)
    if [ -n "$stored" ]; then
      echo "$stored"
      return
    fi
  fi

  echo "unknown"
}

# Save installed version to version file
save_installed_version() {
  local app="$1"
  local version="$2"

  touch "$VERSION_FILE"

  if grep -q "^$app=" "$VERSION_FILE"; then
    sed -i "s/^$app=.*/$app=$version/" "$VERSION_FILE"
  else
    echo "$app=$version" >> "$VERSION_FILE"
  fi
}

# Check if an update is needed
needs_update() {
  local app="$1"
  local install_path="$2"
  local latest="$3"

  if [ ! -f "$install_path" ]; then
    echo "  $app is not installed."
    return 0
  fi

  local installed
  installed=$(get_installed_version "$app")

  if [ "$installed" = "unknown" ]; then
    echo "  Warning: could not determine installed version of $app."
    echo "  binaries.conf specifies version $latest."
    read -rp "  Download and install $app anyway? [y/N] " response
    if [[ "$response" =~ ^[yY] ]]; then
      return 0
    else
      return 1
    fi
  fi

  echo "  Installed version : $installed"
  echo "  Latest version    : $latest"

  if [ "$installed" = "$latest" ]; then
    echo "  $app is up to date, skipping."
    return 1
  fi

  echo "  Update available for $app."
  return 0
}

# Download binary and place it at the install path
download_binary() {
  local app="$1"
  local url="$2"
  local install_path="$3"

  local filename="${url##*/}"
  local tmp_file="$TMP_DIR/$filename"

  echo "  Downloading $url..."
  wget -q "$url" -O "$tmp_file"

  mkdir -p "$(dirname "$install_path")"
  mv "$tmp_file" "$install_path"
  chmod +x "$install_path"
  echo "  Installed to $install_path"
}

# Generate and install a .desktop file
install_desktop() {
  local app="$1"
  local install_path="$2"
  local exec_cmd="$3"
  local comment="$4"
  local icon="$5"
  local categories="$6"

  [ -z "$categories" ] && categories="HamRadio;"
  [ -z "$exec_cmd" ] && exec_cmd="$install_path"

  local desktop_dir="$HOME/.local/share/applications"
  mkdir -p "$desktop_dir"

  local desktop_file="$desktop_dir/$app.desktop"

  echo "  Generating desktop file $desktop_file..."
  cat > "$desktop_file" <<EOF
[Desktop Entry]
Type=Application
Name=$app
Exec=$exec_cmd
Comment=$comment
Icon=$icon
Categories=$categories
EOF

  chmod +x "$desktop_file"
  echo "  Desktop file installed."
}

# Process a single app
process_app() {
  local app="$1"
  local url="$2"
  local install_path="$3"
  local version="$4"
  local gui="$5"
  local exec_cmd="$6"
  local comment="$7"
  local icon="$8"
  local categories="$9"

  echo ""
  echo "=== $app ==="

  if [ -z "$url" ]; then
    echo "  Error: no url specified for $app, skipping."
    return
  fi

  if [ -z "$install_path" ]; then
    echo "  Error: no install path specified for $app, skipping."
    return
  fi

  if [ -f "$install_path" ]; then
    if [ -z "$version" ]; then
      echo "  $app is already installed, skipping."
      return
    fi
    if ! needs_update "$app" "$install_path" "$version"; then
      return
    fi
  else
    echo "  $app is not installed."
  fi

  download_binary "$app" "$url" "$install_path"

  if [ "$gui" = "true" ]; then
    install_desktop "$app" "$install_path" "$exec_cmd" "$comment" "$icon" "$categories"
  fi

  if [ -n "$version" ]; then
    save_installed_version "$app" "$version"
  fi

  echo "  $app installed successfully."
}

# Parse binaries.conf and process each app
process_conf() {
  local app="" url="" install_path="" version="" gui="" exec_cmd="" comment="" icon="" categories=""

  while IFS= read -r line || [ -n "$line" ]; do
    [[ -z "$line" || "$line" == \#* ]] && continue

    if [[ "$line" =~ ^\[(.+)\]$ ]]; then
      if [ -n "$app" ]; then
        process_app "$app" "$url" "$install_path" "$version" "$gui" "$exec_cmd" "$comment" "$icon" "$categories"
      fi
      app="${BASH_REMATCH[1]}"
      url="" install_path="" version="" gui="" exec_cmd="" comment="" icon="" categories=""
      continue
    fi

    local key="${line%%=*}"
    local value="${line#*=}"
    value=$(eval echo "$value")

    case "$key" in
      url)        url="$value" ;;
      install)    install_path="$value" ;;
      version)    version="$value" ;;
      gui)        gui="$value" ;;
      exec)       exec_cmd="$value" ;;
      comment)    comment="$value" ;;
      icon)       icon="$value" ;;
      categories) categories="$value" ;;
    esac

  done < "$CONF_FILE"

  # Process the last app in the file
  if [ -n "$app" ]; then
    process_app "$app" "$url" "$install_path" "$version" "$gui" "$exec_cmd" "$comment" "$icon" "$categories"
  fi
}

# --- Main ---

if [ ! -f "$CONF_FILE" ]; then
  echo "Error: $CONF_FILE not found."
  exit 1
fi

mkdir -p "$TMP_DIR"
mkdir -p "$HOME/.local/state/HamPack"
mkdir -p "$HOME/.local/bin"

echo "Starting HamPack binary installs..."
process_conf

echo ""
echo "Updating desktop database..."
update-desktop-database "$HOME/.local/share/applications/"

echo ""
echo "Cleaning up..."
rm -rf "$TMP_DIR"

echo "All done."