#!/bin/bash
# Copyright 2020 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=Software delivery
### lists package contents

## usage: fx show-package [package name] [--subpackages|-s]
##
## show-package displays the contents of a fuchsia package.
##
##    --subpackages     (Optional) Whether or not to include subpackage contents. Defaults to false.
##
## Note that you may need to ensure your build is up to date to get correct
## results (fx build).

set -euo pipefail

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

function dump_package_contents {
  local merkle="$1"
  local prefix="$2"
  local show_subpackages=$3
  if [ "$merkle" = "null" ]; then
    echo "Failed to find package '$1'"
    return
  fi
  fx-command-run far list --archive="$amber_repo/blobs/$merkle"
  fx-command-run far cat --archive="$amber_repo/blobs/$merkle" --file=meta/contents
  if $show_subpackages; then
    local subpackages_json=$(\
        fx-command-run far cat --archive="$amber_repo/blobs/$merkle" \
        --file=meta/fuchsia.pkg/subpackages)
    local subpackages=$(echo $subpackages_json | fx-command-run jq -r ".subpackages | keys[]")
    for subpackage in $subpackages
    do
        echo "================================================================="
        echo "Subpackage: $prefix$subpackage"
        echo "================================================================="
        local merkle=$(echo $subpackages_json | fx-command-run jq -r ".subpackages.\"$subpackage\"")
        dump_package_contents "$merkle" "$prefix$subpackage/" ""
    done
  fi
}

function main {
  local include_subpackages=false
  local package_name=""

  while [[ $# -gt 0 ]]; do
    case "$1" in
      --help|-h)
        fx-command-help
        exit 0
        ;;
      --subpackages|-s)
        include_subpackages=true
        ;;
      -*|--*)
        echo "Unknown option $1"
        fx-command-help
        exit 1
        ;;
      *)
        if ["$package_name" == ""]; then
          package_name="$1"
        else
          echo "Only one package name should be provided"
          fx-command-help
          exit 1
        fi
        ;;
    esac
    shift
  done

  if [ -z "$package_name" ]; then
    fx-command-help
    exit 1
  fi

  local merkle
  local amber_repo

  readonly amber_repo="$FUCHSIA_BUILD_DIR"/amber-files/repository
  merkle=$(fx-command-run jq -r ".signed.targets.\"$package_name/0\".custom.merkle" \
      "$amber_repo"/targets.json)

  dump_package_contents "$merkle" "" $include_subpackages
}

main "$@"