#!/usr/bin/env bash
# Copyright 2021 Sony Group Corporation. All rights reserved.
# Copyright 2021 Samsung Electronics Co., Ltd. All rights reserved.
# Copyright 2014 The Flutter Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.

set -e

# Needed because if it is set, cd may print the path it changed to.
unset CDPATH

# On Mac OS, readlink -f doesn't work, so follow_links traverses the path one
# link at a time, and then cds into the link destination and find out where it
# ends up.
#
# The returned filesystem path must be a format usable by Dart's URI parser,
# since the Dart command line tool treats its argument as a file URI, not a
# filename. For instance, multiple consecutive slashes should be reduced to a
# single slash, since double-slashes indicate a URI "authority", and these are
# supposed to be filenames. There is an edge case where this will return
# multiple slashes: when the input resolves to the root directory. However, if
# that were the case, we wouldn't be running this shell, so we don't do anything
# about it.
#
# The function is enclosed in a subshell to avoid changing the working directory
# of the caller.
function follow_links() (
  cd -P "$(dirname -- "$1")"
  file="$PWD/$(basename -- "$1")"
  while [[ -h "$file" ]]; do
    cd -P "$(dirname -- "$file")"
    file="$(readlink -- "$file")"
    cd -P "$(dirname -- "$file")"
    file="$PWD/$(basename -- "$file")"
  done
  echo "$file"
)

PROG_NAME="$(follow_links "${BASH_SOURCE[0]}")"
BIN_DIR="$(cd "${PROG_NAME%/*}" ; pwd -P)"
OS="$(uname -s)"

# Allow only 64-bit host platform.
if [ "$(getconf LONG_BIT)" != "64" ]; then
  echo "$(basename $PROG_NAME) only supports 64 bit platforms."
  exit 1
fi

# If we're on Windows, invoke the batch script instead to get proper locking.
if [[ $OS =~ MINGW.* || $OS =~ CYGWIN.* ]]; then
  echo "Window platforms are not supported."
  exit 1
fi

source "$BIN_DIR/internal/shared.sh"

# Clone or update the flutter repo.
update_flutter

# Upgrade flutter-elinux if needed.
update_flutter_elinux

# Run the snapshot.
exec_snapshot "$@"