#!/bin/bash
# Copyright 2018 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.

# Unit tests for //scripts/pave-prebuilt.
#
# Usage: pave-prebuilt-tests

set -o errexit
set -o nounset
set -o pipefail

# Read in the tool under test. Set TESTING=1 to avoid invoking main().
readonly PARENT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
TESTING=1 source "${PARENT_DIR}/../pave-prebuilt"

# expect_archive_produces_id <archive-path> <expected-id>
function expect_archive_produces_id {
  local archive="$1"
  local expected_id="$2"

  # archive_to_unique_id expects the file to live in the filesystem,
  # so create an empty file at a related path under a temp directory.
  local tmpdir
  tmpdir="$(mktemp -d)"
  local full_archive="${tmpdir}/${archive}"
  mkdir -p "$(dirname "${full_archive}")"
  touch "${full_archive}"

  EXPECT_EQ \
    "${expected_id}" \
    "$(archive_to_unique_id "${full_archive}")" \
    "input filename '${full_archive}'"

  rm -rf "${tmpdir}"
}

function test::archive_to_unique_id {
  # Expected ID when falling back to the "hash the archive contents" case.
  # Hash is the SHA-1 sum of an empty file.
  local fallback_hash='hash-da39a3ee5e6b4b0d3255bfef95601890afd80709'

  # Stem tests #

  # A long hex hash followed by an extension is a stem.
  expect_archive_produces_id \
    '/home/USER/Downloads/625284e057cc25a77cdab944d46ab3de692bade1.tar' \
    'stem-625284e057cc25a77cdab944d46ab3de692bade1'

  # Extension doesn't matter.
  expect_archive_produces_id \
    '/home/USER/Downloads/625284e057cc25a77cdab944d46ab3de692bade1.png' \
    'stem-625284e057cc25a77cdab944d46ab3de692bade1'

  # A short hex hash is not a stem, and falls back to hashing.
  expect_archive_produces_id \
    '/home/USER/Downloads/625284e0.tar' \
    "${fallback_hash}"

  # A long hex hash followed by non-hex before the extension is not a stem,
  # and falls back to hashing.
  expect_archive_produces_id \
    '/home/USER/Downloads/625284e057cc25a77cdab944d46ab3de692bade1__ZZZZZ.tar' \
    "${fallback_hash}"

  # Build ID tests #

  # A "fuchsia.*" file living in a numbered directory is a build ID.
  expect_archive_produces_id \
    '/home/USER/.cache/builds/8937296116261653552/fuchsia.tar.gz' \
    'build-8937296116261653552'

  # Extension dosen't matter.
  expect_archive_produces_id \
    '/home/USER/.cache/builds/8937296116261653552/fuchsia.png' \
    'build-8937296116261653552'

  # A "fuchsia.*" file living in a small-numbered directory is not a build ID,
  # and falls back to hashing.
  expect_archive_produces_id \
    '/home/USER/.cache/builds/552/fuchsia.tar.gz' \
    "${fallback_hash}"

  # A "fuchsia.*" file living in a number-prefixed directory is not a build ID,
  # and falls back to hashing.
  expect_archive_produces_id \
    '/home/USER/.cache/builds/8937296116261653552__ZZZZZ/fuchsia.tar.gz' \
    "${fallback_hash}"

  # A "fuchsia.*" file living in a non-numbered directory is not a build ID,
  # and falls back to hashing.
  expect_archive_produces_id \
    '/home/USER/Downloads/fuchsia.tar.gz' \
    "${fallback_hash}"
}

# Build ID is sniffed even when archive is passed as a relative path.
function test::archive_to_unique_id_relative {
  local tmpdir
  tmpdir="$(mktemp -d)"
  local archive='/home/USER/.cache/builds/8937296116261653552/fuchsia.tar.gz'
  local full_archive="${tmpdir}/${archive}"
  mkdir -p "$(dirname "${full_archive}")"
  touch "${full_archive}"

  local unique_id
  unique_id="$(
    cd "$(dirname "${full_archive}")"
    archive_to_unique_id ./fuchsia.tar.gz
  )"

  EXPECT_EQ \
    'build-8937296116261653552' \
    "${unique_id}" \
    "input filename './fuchsia.tar.gz'"

  rm -rf "${tmpdir}"
}

#
# Test framework.
# TOOD(dbort): Move this to a common file if other tools want to use it.
#

# Any failing assert/expect should set this to 1.
FAILED=0

function EXPECT_EQ {
  local v1="$1"
  shift
  local v2="$1"
  shift
  if [[ "${v1}" != "${v2}" ]]; then
    local msg="$@"
    if [[ -n "${msg}" ]]; then
      msg=": ${msg}"
    fi
    echo "TEST FAILURE: '${v1}' != '${v2}'${msg}"
    FAILED=1
    return 1
  fi
}

# Prints the names of all functions with a test:: prefix.
function print_test_functions {
  # "declare -F" prints all declared function names, with lines like
  # "declare -f funcname".
  declare -F \
    | grep -E '^declare -f test::' \
    | sed -e 's/^declare -f //'
}

function test_main {
  local num_tests=0
  local num_failures=0
  for t in $(print_test_functions); do
    num_tests=$(( num_tests + 1 ))
    FAILED=0
    echo "RUNNING: ${t}"
    "${t}" || FAILED=1
    if (( FAILED )); then
      num_failures=$(( num_failures + 1 ))
      echo "FAILED: ${t}"
    else
      echo "PASSED: ${t}"
    fi
  done
  if (( num_failures == 0 )); then
    echo "All ${num_tests} tests passed!"
    echo "PASS"
    return 0
  else
    echo "${num_failures}/${num_tests} tests failed"
    echo "FAIL"
    return 1
  fi
}

test_main "$@"