#!/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.

### run various checks to determine the health of a Fuchsia checkout

## usage: fx doctor

# The goal of this script is to detect common issues with a Fuchsia
# checkout and potential conflicts in the user's shell environment.
#
# For example, on OS X the xcode command line tool
# installation often lapses. Ensuring that `xcode select --install` is
# run as part of a checkout or build is problematic: the step involves
# manual input. Detecting that it needs to be run, however, is
# perfectly mechanizable.
#
# For potential issues in the user's shell initialization script
# (such as ~/.bashrc), this script will also run a shell checkup
# script (for example, devshell/lib/bashrc_checkup.sh)
# under the user's bash "${SHELL}" (if different from /bin/bash),
# load the user's shell settings, and check for any known issues.

source "$(cd "$(dirname "${BASH_SOURCE[0]}")" >/dev/null 2>&1 && pwd)"/lib/vars.sh || exit $?
source "${FUCHSIA_DIR}/scripts/devshell/lib/style.sh" || exit $?
source "${FUCHSIA_DIR}/scripts/devshell/lib/common_term_styles.sh" || exit $?

fx-config-read || exit $?

dr_mac() {
  local status=0
  # TODO actually check the need for this

  info "Make sure you've run \`xcode-select install\`"

  details << EOF
A common issue with Fuchsia development on macOS is needing to
re-run the \`xcode-select install\` step. The typical symptom is
failure to find system C or C++ headers after a reboot or update.

See $(link 'https://fuchsia.googlesource.com/docs/getting_started.md#macos')
for more details.
EOF

  return ${status}
}

dr_linux() {
  local status=0
  return ${status}
}

shell_checkup() {
  local status=0

  # If the user is using bash, their default interactive "${SHELL}"
  # may differ from the script-standard "/bin/bash", and their ~/.bashrc
  # may depend on features of their shell that are not present in
  # /bin/bash, so launch the shell checkup script using "${SHELL}".
  #
  # For example, since MacOS includes only bash version 3, Homebrew users
  # may install bash 4 in /usr/local/bin/bash, and then select
  # bash 4 by adding it to /etc/shells, and running the "chsh" command.

  local shell_type="$(basename "${SHELL}")"
  case "${shell_type}" in
    bash)
      local current_debug_flag="$(echo $-|sed -n 's/.*x.*/-x/p')"
      eval "${SHELL}" "${current_debug_flag}" "${FUCHSIA_DIR}/scripts/devshell/lib/bashrc_checkup.sh" || status=$?
      ;;
    *)
      info "No shell checkup for ${shell_type}"
      ;;
  esac

  return ${status}
}

dr_all() {
  local status=0
  shell_checkup || status=$?
  return ${status}
}

main() {
  local status=0
  case $(uname) in
    Darwin)
      dr_mac || status=$?
      ;;
    Linux)
      dr_linux || status=$?
      ;;
  esac
  dr_all || status=$?
  return ${status}
}

main "$@" || exit $?