#!/bin/bash
set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"

if [[ $# -lt 1 || $# -gt 2 ]]; then
    echo "Usage: $0 CANDIDATE.deb [PREVIOUS.deb]" >&2
    exit 2
fi

candidate="$(realpath "$1")"
previous=""

[[ -f "$candidate" ]] || { echo "Package not found: $candidate" >&2; exit 1; }

if [[ $# -eq 2 ]]; then
    previous="$(realpath "$2")"
    [[ -f "$previous" ]] || { echo "Package not found: $previous" >&2; exit 1; }
fi

echo "Validating $(basename "$candidate") on Debian Trixie"

docker_args=(
    run --rm -i
    -v "$candidate:/packages/candidate.deb:ro"
)

if [[ -n "$previous" ]]; then
    docker_args+=( -v "$previous:/packages/previous.deb:ro" )
fi

timeout --signal=TERM --kill-after=15s 720s \
    docker "${docker_args[@]}" debian:trixie-slim \
    bash -s -- "${previous:+/packages/previous.deb}" <<'CONTAINER'
set -Eeuo pipefail

validation_failure() {
    status=$?
    echo "Validation failed at line ${BASH_LINENO[0]}: ${BASH_COMMAND}" >&2

    if command -v lpstat >/dev/null 2>&1; then
        lpstat -t >&2 || true
        lpoptions -p Elmer -l >&2 || true
    fi

    [[ ! -f /tmp/provision-first.log ]] || cat /tmp/provision-first.log >&2
    [[ ! -f /tmp/provision-second.log ]] || cat /tmp/provision-second.log >&2
    exit "$status"
}

trap validation_failure ERR

export DEBIAN_FRONTEND=noninteractive

# Package validation runs in a container with no init system. Do not let
# maintainer scripts try to start CUPS, Avahi or other irrelevant daemons;
# services are inspected and CUPS is started explicitly when the test needs it.
cat > /usr/sbin/policy-rc.d <<'POLICY'
#!/bin/sh
exit 101
POLICY
chmod 0755 /usr/sbin/policy-rc.d

run_logged() {
    label="$1"
    seconds="$2"
    shift 2

    if ! timeout --signal=TERM --kill-after=10s "${seconds}s" "$@" \
            >"/tmp/${label}.log" 2>&1; then
        cat "/tmp/${label}.log" >&2
        echo "${label} exceeded ${seconds}s or failed" >&2
        exit 1
    fi
}

run_logged apt-update 120 apt-get update -qq

previous="${1:-}"

if [[ -n "$previous" ]]; then
    run_logged previous-install 360 apt-get install -y -qq "$previous"

    cat > /etc/ekklesia-classroom/device.conf <<'CONFIG'
# Configuration carried forward from 0.1.36
UPDATE_URL=https://updates.riverofglorymn.org
CHANNEL=canary
DVD_ENABLED=false
UI_SCALE=1.25
MQTT_ENABLED=true
MQTT_HOST=broker.example.test
MQTT_PORT=1884
MQTT_USERNAME=classroom
MQTT_PASSWORD=preserve-me
CUSTOM_SETTING=preserve-me-too
CONFIG
fi

run_logged candidate-install 360 apt-get install -y -qq /packages/candidate.deb

command -v nmtui >/dev/null
command -v lpadmin >/dev/null
command -v lpinfo >/dev/null

systemctl is-enabled NetworkManager.service >/dev/null
systemctl is-enabled cups.service >/dev/null
! systemctl is-enabled NetworkManager-wait-online.service >/dev/null 2>&1

# The audio policy reaches a session, and is ordered after the server it
# actually talks to. Ordering it only after pipewire and wireplumber is
# what let it race PipeWire's PulseAudio server at boot, fail its one
# startup attempt and then sit idle — the rooms were silent on 0.2.2 for
# exactly this reason, so the ordering is asserted rather than assumed.
audio_unit=/etc/systemd/user/ekklesia-classroom-audio.service
[[ -f "$audio_unit" ]]
grep -q 'pipewire-pulse' "$audio_unit"
[[ -L /etc/systemd/user/plasma-workspace.target.wants/ekklesia-classroom-audio.service ]]
command -v classroom-audio >/dev/null
command -v pactl >/dev/null

# The policy module and the daemon agree on what they import, on a machine
# rather than in a checkout.
PYTHONPATH=/usr/local/lib/ekklesia-classroom python3 -c \
    'import classroom_audio; classroom_audio.settled([], "auto", None)'

grep -q '^managed=false$' /etc/NetworkManager/NetworkManager.conf

# A normal Docker container has Ethernet and no Wi-Fi adapter. Reaching this
# point proves package configuration did not require Wi-Fi hardware.
! find /sys/class/net -mindepth 2 -maxdepth 2 -type d -name wireless | grep -q .

/usr/sbin/cupsd
sleep 1

driver='foomatic-db-compressed-ppds:0/ppd/foomatic-ppd/Generic-PCL_6_PCL_XL_Printer-pxlcolor.ppd'
lpinfo -m | grep -q "^${driver} "

# Simulate the queue an older release may have left behind, then run the real
# boot provisioning path. Chrome is stubbed as already installed and DVD is
# disabled so the test remains entirely local and deterministic.
lpadmin -p Classroom_Color -v socket://192.0.2.10:9100 -m "$driver"
install -m755 /bin/true /usr/local/bin/google-chrome

timeout --signal=TERM --kill-after=5s 45s classroom-provision \
    >/tmp/provision-first.log

! lpstat -p Classroom_Color >/dev/null 2>&1
lpstat -p Elmer -d -v | grep -q 'socket://10.10.0.155:9100'
lpstat -l -p Elmer | grep -q 'Description: Elmer'
lpoptions -p Elmer -l | grep -Eq '^PrintoutMode/.*:.*\*Normal([[:space:]]|$)'
lpoptions -p Elmer -l | grep -Eq '^ColorModel/.*:.*\*Color([[:space:]]|$)'
[[ "$(lpstat -e)" == "Elmer" ]]
[[ "$(systemctl is-enabled avahi-daemon.service 2>/dev/null || true)" == "masked" ]]
[[ "$(systemctl is-enabled avahi-daemon.socket 2>/dev/null || true)" == "masked" ]]

timeout --signal=TERM --kill-after=5s 45s classroom-provision \
    >/tmp/provision-second.log
grep -q 'Elmer is already correctly configured' /tmp/provision-second.log

if [[ -n "$previous" ]]; then
    # The room's own values, untouched by the upgrade.
    grep -q '^DVD_ENABLED=false$' /etc/ekklesia-classroom/device.conf
    grep -q '^UI_SCALE=1.25$' /etc/ekklesia-classroom/device.conf
    grep -q '^MQTT_PASSWORD=preserve-me$' /etc/ekklesia-classroom/device.conf
    grep -q '^CUSTOM_SETTING=preserve-me-too$' /etc/ekklesia-classroom/device.conf

    # The channel a room was put on deliberately survives the upgrade.
    # canary is where the next development release goes, and the Plasma
    # classroom is the stable line now, so nothing here has to move.
    grep -q '^CHANNEL=canary$' /etc/ekklesia-classroom/device.conf

    # And a room that was carried through the experiment on its own
    # channel comes home, because that channel is the obsolete one now.
    sed -i 's/^CHANNEL=.*/CHANNEL=classroom-v2/' /etc/ekklesia-classroom/device.conf
    classroom-migrate >/tmp/migrate-from-v2.log 2>&1
    grep -q '^CHANNEL=stable$' /etc/ekklesia-classroom/device.conf
    grep -q '^MQTT_PASSWORD=preserve-me$' /etc/ekklesia-classroom/device.conf
    grep -q '^CUSTOM_SETTING=preserve-me-too$' /etc/ekklesia-classroom/device.conf
    sed -i 's/^CHANNEL=.*/CHANNEL=canary/' /etc/ekklesia-classroom/device.conf

    # Every setting this release has that the room predates, appended
    # exactly once. classroom-migrate hands device.conf to the shared
    # helper after its own work for this, so that a machine converges
    # whether it got here through this postinst or through somebody
    # running the command by hand.
    for setting in LIVE_ENABLED AUDIO_OUTPUT UI_SCALE; do
        [[ "$(grep -c "^${setting}=" /etc/ekklesia-classroom/device.conf)" -eq 1 ]]
    done

    run_logged candidate-reinstall 360 \
        apt-get install --reinstall -y -qq /packages/candidate.deb

    # An install that changes nothing must change nothing.
    for setting in LIVE_ENABLED AUDIO_OUTPUT UI_SCALE; do
        [[ "$(grep -c "^${setting}=" /etc/ekklesia-classroom/device.conf)" -eq 1 ]]
    done
    grep -q '^MQTT_PASSWORD=preserve-me$' /etc/ekklesia-classroom/device.conf
    grep -q '^CUSTOM_SETTING=preserve-me-too$' /etc/ekklesia-classroom/device.conf
    grep -q '^CHANNEL=canary$' /etc/ekklesia-classroom/device.conf

    # And by hand, on a machine that is already converged: the command a
    # technician runs must be safe to run twice.
    classroom-migrate >/tmp/migrate-by-hand.log 2>&1
    for setting in LIVE_ENABLED AUDIO_OUTPUT UI_SCALE; do
        [[ "$(grep -c "^${setting}=" /etc/ekklesia-classroom/device.conf)" -eq 1 ]]
    done
    grep -q '^MQTT_PASSWORD=preserve-me$' /etc/ekklesia-classroom/device.conf
    ! grep -q 'preserve-me' /tmp/migrate-by-hand.log
fi

echo "Trixie package, upgrade, bounded install, networking, Elmer printing and reinstall checks passed."
CONTAINER