#!/bin/bash
# Copyright 2019 The Fuchsia Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

#### CATEGORY=Build
### list packages are built

## usage: fx list-packages [--base|--cache|--universe] [--verbose] [pattern]
##
## list-packages lists the packages that the build is aware of. These are
## packages that can be rebuilt, and/or pushed to a device.
## If a pattern is supplied, only packages matching the pattern are listed.
## Note: list-packages DOES NOT list all packages that could be built, only
## those which are included in the current build configuration.
##
##   --base      - list only packages in base
##   --cache     - list only packages in cache
##   --universe  - list all packages
##   --verbose   - print package set for each listed package
##
## See https://fuchsia.dev/fuchsia-src/development/build/boards_and_products
## for more information about using these package sets.

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/updates.sh || exit $?
fx-config-read

base_packages_list="${FUCHSIA_BUILD_DIR}/base_packages.list"
cache_packages_list="${FUCHSIA_BUILD_DIR}/cache_packages.list"
universe_packages_list="${FUCHSIA_BUILD_DIR}/universe_packages.list"

package_sets=()
verbose=false
search_query="^.*$" # Default query matches "any" to list all packages.

function main {
  fx-standard-switches "$@"
  set -- "${FX_ARGV[@]}"

  while [[ $# -gt 0 ]]; do
    case "$1" in
    --base)
      package_sets+=( "${base_packages_list}" )
      shift
      ;;
    --cache)
      package_sets+=( "${cache_packages_list}" )
      shift
      ;;
    --universe)
      package_sets+=( "${universe_packages_list}" )
      shift
      ;;
    -v|--verbose)
      verbose=true
      shift
      ;;
    -*)
      fx-error "Unknown argument: $1"
      return 1
      ;;
    *)
      search_query="$1"
      break
      ;;
    esac
  done

  # Default to universe if no options are provided.
  if [[ ${#package_sets[@]} -eq 0 ]]; then
    package_sets+=( "${universe_packages_list}" )
  fi

  if [[ ${#package_sets[@]} -ne 1 ]]; then
    fx-error "Cannot supply multiple package set filters."
    return 1
  fi

  # Search the provided package set.
  results=($(grep "${search_query}" "${package_sets[0]}"))

  # Pass through a non-zero return value when no results are found.
  if [[ ${#results[@]} -eq 0 ]]; then
    return 1
  fi

  # Verbose searches through all package sets and tags each result.
  if "${verbose}"; then
    all_packages=( "${base_packages_list}" "${cache_packages_list}" "${universe_packages_list}" )
    for i in "${!results[@]}"; do
      package="${results[$i]}"
      tags=($(grep "^${package}$" "${all_packages[@]}"))

      for j in "${!tags[@]}"; do
        package_file=$(basename "${tags[$j]%:*}")
        tags[$j]="${package_file%_packages.list}"
      done

      results[$i]="${package} [${tags[*]}]"
    done
  fi

  # Print all matching patterns with discovered sets.
  printf '%s\n' "${results[@]}"
  return 0
}

main "$@"