#!/bin/bash
#
# Purpose : coredesktop-dev doctor: check this machine is set up to work on
#           CoreDesktop. Read-only.

doctor_usage() {
  cat << EOF
Usage: coredesktop-dev doctor

Checks the tools are installed, the working copy is set up, and the deployed
copy (~/.local/share/coredesktop) can still update. Exits 1 if anything needs
fixing.
EOF
}

PROBLEMS=0

ok() {
  echo "ok       $1"
}

problem() {
  echo "PROBLEM  $1"
  shift
  local line
  for line in "$@"; do
    echo "         $line"
  done
  PROBLEMS=1
}

note() {
  echo "note     $1"
}

cmd_doctor() {
  case "${1:-}" in
    -h | --help) doctor_usage; return 0 ;;
    "") ;;
    *) doctor_usage >&2; return 1 ;;
  esac

  local tool missing=()
  for tool in shellcheck bats tea qemu-system-x86_64 qemu-img xorriso; do
    command -v "$tool" &> /dev/null || missing+=("$tool")
  done
  if (( ${#missing[@]} == 0 )); then
    ok "shellcheck, bats, tea, QEMU and xorriso are installed"
  else
    problem "not installed: ${missing[*]}" "fix: bash $(sibling_dir)/update.sh"
  fi

  if [ -r /dev/kvm ] && [ -w /dev/kvm ]; then
    ok "KVM is available for the smoketest's virtual machines"
  else
    problem "can't use /dev/kvm, so the smoketest can't run VMs" \
      "fix: turn on virtualization (VT-x/AMD-V) in the firmware settings"
  fi

  load_config
  if [ -z "$WORKING_COPY" ]; then
    problem "no working copy is set" "fix: bash $(sibling_dir)/install.sh"
  elif is_coredesktop_clone "$WORKING_COPY"; then
    ok "working copy: $WORKING_COPY"
  else
    problem "the working copy, $WORKING_COPY, isn't a clone of CoreDesktop" \
      "fix: bash $(sibling_dir)/install.sh"
  fi

  doctor_deployed

  if [ -n "${COREDESKTOP_DEV_VIA_FLATPAK:-}" ] || in_flatpak; then
    note "you ran this in a Flatpak, which has no pacman, systemctl or host /tmp;
         coredesktop-dev runs itself on the host for you (flatpak-spawn --host)"
  fi

  if [ -n "$WORKING_COPY" ] && hook_is_ours "$(hook_path)"; then
    ok "the pre-push hook is installed"
  else
    note "the pre-push hook isn't installed (coredesktop-dev hooks install)"
  fi

  return $PROBLEMS
}

doctor_deployed() {
  if ! git -C "$COREDESKTOP" rev-parse --git-dir &> /dev/null; then
    problem "CoreDesktop isn't installed in $COREDESKTOP"
    return
  fi

  local changes
  changes="$(git -C "$COREDESKTOP" status --porcelain --untracked-files=no)"
  if [ -z "$changes" ]; then
    ok "the deployed copy has no local changes"
  else
    problem "the deployed copy has local changes, so update can't pull:" \
      "${changes//$'\n'/$'\n'         }" \
      "fix: coredesktop-dev deployed restore"
  fi

  if ! GIT_TERMINAL_PROMPT=0 timeout 30 git -C "$COREDESKTOP" fetch --quiet &> /dev/null; then
    problem "couldn't reach the deployed copy's upstream to check it can update"
  elif git -C "$COREDESKTOP" merge-base --is-ancestor HEAD '@{upstream}' 2> /dev/null; then
    ok "the deployed copy can fast-forward to its upstream"
  else
    problem "the deployed copy has commits its upstream doesn't, so update's pull will fail" \
      "see: git -C $COREDESKTOP log @{upstream}..HEAD"
  fi
}

# hooks.sh has hook_path and hook_is_ours
source "$(dirname "${BASH_SOURCE[0]}")/hooks.sh"