#!/usr/bin/env bash
#
# Usage: test-compose [testname]
#
ME=$(basename $0)

###############################################################################
# BEGIN stuff you can but probably shouldn't customize

# Directory where this script and all subtests live
TEST_ROOTDIR=$(realpath $(dirname $0))

# Podman executable
PODMAN_BIN=$(realpath $TEST_ROOTDIR/../../bin)/podman

# Local path to docker socket with unix prefix
# The path will be changed for rootless users
DOCKER_SOCK=/var/run/docker.sock

# END   stuff you can but probably shouldn't customize
###############################################################################
# BEGIN setup

export TMPDIR=${TMPDIR:-/var/tmp}
WORKDIR=$(mktemp --tmpdir -d $ME.tmp.XXXXXX)

# Log of all HTTP requests and responses; always make '.log' point to latest
LOGBASE=${TMPDIR}/$ME.log
LOG=${LOGBASE}.$(date +'%Y%m%dT%H%M%S')
ln -sf $LOG $LOGBASE

# Keep track of test count and failures in files, not variables, because
# variables don't carry back up from subshells.
testcounter_file=$WORKDIR/.testcounter
failures_file=$WORKDIR/.failures

echo 0 >$testcounter_file
echo 0 >$failures_file

# END   setup
###############################################################################
# BEGIN infrastructure code - the helper functions used in tests themselves

#################
#  is_rootless  #  Check if we run as normal user
#################
function is_rootless() {
    [ "$(id -u)" -ne 0 ]
}

#########
#  die  #  Exit error with a message to stderr
#########
function die() {
    echo "$ME: $*" >&2
    exit 1
}

########
#  is  #  Simple comparison
########
function is() {
    local actual=$1
    local expect=$2
    local testname=$3

    if [[ $actual = $expect ]]; then
        # On success, include expected value; this helps readers understand
        _show_ok 1 "$testname=$expect"
        return
    fi
    _show_ok 0 "$testname" "$expect" "$actual"
}

##########
#  like  #  Compare, but allowing patterns
##########
function like() {
    local actual=$1
    local expect=$2
    local testname=$3

    # "is" (equality) is a subset of "like", but one that expr fails on if
    # the expected result has shell-special characters like '['. Treat it
    # as a special case.

    if [[ "$actual" = "$expect" ]]; then
        _show_ok 1 "$testname=$expect"
        return
    fi

    if expr "$actual" : ".*$expect" &>/dev/null; then
        # On success, include expected value; this helps readers understand
        _show_ok 1 "$testname ('$actual') ~ $expect"
        return
    fi
    _show_ok 0 "$testname" "~ $expect" "$actual"
}

##############
#  _show_ok  #  Helper for is() and like(): displays 'ok' or 'not ok'
##############
function _show_ok() {
    local ok=$1
    local testname=$2

    # If output is a tty, colorize pass/fail
    local red=
    local green=
    local reset=
    local bold=
    if [ -t 1 ]; then
        red='\e[31m'
        green='\e[32m'
        reset='\e[0m'
        bold='\e[1m'
    fi

    _bump $testcounter_file
    count=$(<$testcounter_file)

    # "skip" is a special case of "ok". Assume that our caller has included
    # the magical '# skip - reason" comment string.
    if [[ $ok == "skip" ]]; then
        # colon-plus: replace green with yellow, but only if green is non-null
        green="${green:+\e[33m}"
        ok=1
    fi
    if [ $ok -eq 1 ]; then
        echo -e "${green}ok $count $testname${reset}"
        echo    "ok $count $testname" >>$LOG
        return
    fi

    # Failed
    local expect=$3
    local actual=$4
    printf "${red}not ok $count $testname${reset}\n"
    printf "${red}#  expected: %s${reset}\n" "$expect"
    printf "${red}#    actual: ${bold}%s${reset}\n" "$actual"

    echo    "not ok $count $testname" >>$LOG
    echo    "  expected: $expect"                     >>$LOG

    _bump $failures_file
}

###########
#  _bump  #  Increment a counter in a file
###########
function _bump() {
    local file=$1

    count=$(<$file)
    echo $(( $count + 1 )) >| $file
}

###############
#  test_port  #  Run curl against a port, check results against expectation
###############
function test_port() {
    local port="$1"              # e.g. 5000
    local op="$2"                # '=' or '~'
    local expect="$3"            # what to expect from curl output

    # -s -S means "silent, but show errors"
    local actual=$(curl --retry 3 --retry-all-errors -s -S http://127.0.0.1:$port/)
    local curl_rc=$?

    # FIXME 2021-04-13: test is flaking, curl succeeds but returns empty result.
    # Could it be that the container is not actually ready? Wait, and retry.
    if [[ $curl_rc -eq 0 && -z "$actual" ]]; then
        sleep 1
        echo "# Retrying curl:"
        actual=$(curl --retry 3 --retry-all-errors -s -S http://127.0.0.1:$port/)
        curl_rc=$?
    fi

    if [ $curl_rc -ne 0 ]; then
        _show_ok 0 "$testname - curl failed with status $curl_rc"
    fi

    case "$op" in
        '=')   is   "$actual" "$expect" "$testname : port $port" ;;
        '~')   like "$actual" "$expect" "$testname : port $port" ;;
        *)     die "Invalid operator '$op'" ;;
    esac
}


###################
#  start_service  #  Run the socket listener
###################
service_pid=
function start_service() {
    test -x $PODMAN_BIN || die "Not found: $PODMAN_BIN"

    # FIXME: use ${testname} subdir but we can't: 50-char limit in runroot
    if ! is_rootless; then
        rm -rf $WORKDIR/{root,runroot,cni}
    else
        $PODMAN_BIN unshare rm -rf $WORKDIR/{root,runroot,cni}
    fi
    rm -f $DOCKER_SOCK
    mkdir --mode 0755 $WORKDIR/{root,runroot,cni}
    chcon --reference=/var/lib/containers $WORKDIR/root
    cp /etc/cni/net.d/*podman*conflist $WORKDIR/cni/

    $PODMAN_BIN \
        --root $WORKDIR/root \
        --runroot $WORKDIR/runroot \
        --cgroup-manager=systemd \
        --cni-config-dir $WORKDIR/cni \
        system service \
        --time 0 unix://$DOCKER_SOCK \
        &> $WORKDIR/server.log &
    service_pid=$!

    # Wait (FIXME: how do we test the socket?)
    local _timeout=5
    while [ $_timeout -gt 0 ]; do
        # FIXME: should we actually try a read or write?
        test -S $DOCKER_SOCK && return
        sleep 1
        _timeout=$(( $_timeout - 1 ))
    done
    cat $WORKDIR/server.log
    die "Timed out waiting for service"
}

############
#  podman  #  Needed by some test scripts to invoke the actual podman binary
############
function podman() {
    echo "\$ podman $*"           >>$WORKDIR/output.log
    output=$($PODMAN_BIN \
        --root    $WORKDIR/root    \
        --runroot $WORKDIR/runroot \
        "$@")
    echo -n "$output" >>$WORKDIR/output.log
}

###################
#  random_string  #  Returns a pseudorandom human-readable string
###################
function random_string() {
    # Numeric argument, if present, is desired length of string
    local length=${1:-10}

    head /dev/urandom | tr -dc a-zA-Z0-9 | head -c$length
}

# END   infrastructure code
###############################################################################
# BEGIN sanity checks

for tool in curl docker-compose; do
    type $tool &>/dev/null || die "$ME: Required tool '$tool' not found"
done

# END   sanity checks
###############################################################################
# BEGIN entry handler (subtest invoker)

# When rootless use a socket path accessible by the rootless user
if is_rootless; then
    DOCKER_SOCK="$WORKDIR/docker.sock"
    DOCKER_HOST="unix://$DOCKER_SOCK"
    # export DOCKER_HOST docker-compose will use it
    export DOCKER_HOST
fi

# Identify the tests to run. If called with args, use those as globs.
tests_to_run=()
if [ -n "$*" ]; then
    shopt -s nullglob
    for i; do
        match=(${TEST_ROOTDIR}/*${i}*/docker-compose.yml)
        if [ ${#match} -eq 0 ]; then
            die "No match for $TEST_ROOTDIR/*$i*.curl"
        fi
        tests_to_run+=("${match[@]}")
    done
    shopt -u nullglob
else
    tests_to_run=(${TEST_ROOTDIR}/*/docker-compose.yml)
fi

# Too hard to precompute the number of tests; just spit it out at the end.
n_tests=0

# We aren't really TAP 13; this helps logformatter recognize our output as BATS
echo "TAP version 13"

for t in ${tests_to_run[@]}; do
    testdir="$(dirname $t)"
    testname="$(basename $testdir)"

    if [ -e $test_dir/SKIP ]; then
        local reason="$(<$test_dir/SKIP)"
        if [ -n "$reason" ]; then
            reason=" - $reason"
        fi
        _show_ok skip "$testname # skip$reason"
        continue
    fi

    start_service

    logfile=$WORKDIR/$testname.log
    (
        cd $testdir || die "Cannot cd $testdir"

        # setup file may be used for creating temporary directories/files.
        # We source it so that envariables defined in it will get back to us.
        if [ -e setup.sh ]; then
            . setup.sh
        fi
        if [ -e teardown.sh ]; then
            trap '. teardown.sh' 0
        fi

        docker-compose up -d     &> $logfile
        docker_compose_rc=$?
        if [[ $docker_compose_rc -ne 0 ]]; then
            _show_ok 0 "$testname - up" "[ok]" "status=$docker_compose_rc"
            sed -e 's/^/#  /' <$logfile
            docker-compose down >>$logfile 2>&1      # No status check here
            exit 1
        fi
        _show_ok 1 "$testname - up"

        # Run tests. This is likely to be a series of 'test_port' checks
        # but may also include podman commands to inspect labels, state
        if [ -e tests.sh ]; then
            . tests.sh
        fi
        # FIXME: if any tests fail, try 'podman logs' on container?

        if [ -n "$COMPOSE_WAIT" ]; then
            echo -n "Pausing due to \$COMPOSE_WAIT. Press ENTER to continue: "
            read keepgoing
        fi

        # Done. Clean up.
        docker-compose down     &>> $logfile
        rc=$?
        if [[ $rc -eq 0 ]]; then
            _show_ok 1 "$testname - down"
        else
            _show_ok 0 "$testname - down" "[ok]" "rc=$rc"
            # FIXME: show error
        fi
    )

    kill $service_pid
    wait $service_pid

    # FIXME: otherwise we get EBUSY
    if ! is_rootless; then
        umount $WORKDIR/root/overlay  &>/dev/null
    else
        $PODMAN_BIN unshare umount $WORKDIR/root/overlay  &>/dev/null
    fi

    # FIXME: run 'podman ps'?
#    rm -rf $WORKDIR/${testname}
done

# END   entry handler
###############################################################################

# Clean up

test_count=$(<$testcounter_file)
failure_count=$(<$failures_file)

if [ -z "$PODMAN_TESTS_KEEP_WORKDIR" ]; then
     if ! is_rootless; then
        rm -rf $WORKDIR
    else
        $PODMAN_BIN unshare rm -rf $WORKDIR
    fi
fi

echo "1..${test_count}"

exit $failure_count