#!/bin/bash

set -euo pipefail

repo_dir="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/../.." && pwd)"
helper="$repo_dir/config/dot/quickshell/scripts/panama-osd"
scratch="$(mktemp -d)"
trap 'rm -rf "$scratch"' EXIT

mkdir -p "$scratch/bin"
log="$scratch/calls"

cat >"$scratch/bin/wpctl" <<'SH'
#!/bin/bash
printf 'wpctl' >>"$OSD_TEST_LOG"
printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
printf '\n' >>"$OSD_TEST_LOG"
if [[ $1 == "get-volume" ]]; then
    printf '%s\n' "${WPCTL_OUTPUT:-Volume: 0.58}"
fi
SH

cat >"$scratch/bin/brightnessctl" <<'SH'
#!/bin/bash
printf 'brightnessctl' >>"$OSD_TEST_LOG"
printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
printf '\n' >>"$OSD_TEST_LOG"
if [[ " $* " == *" -m "* && " $* " != *" set "* ]]; then
    [[ ${BACKLIGHT_AVAILABLE:-true} == true ]] || exit 1
    printf '%s\n' "${BRIGHTNESS_OUTPUT:-intel_backlight,backlight,500,50%,1000}"
fi
SH

cat >"$scratch/bin/panama-brightness" <<'SH'
#!/bin/bash
printf 'panama-brightness' >>"$OSD_TEST_LOG"
printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
printf '\n' >>"$OSD_TEST_LOG"

case "${1:-}" in
    list)
        if [[ -n ${DDC_LIST_JSON:-} ]]; then
            printf '%s\n' "$DDC_LIST_JSON"
        else
            printf '%s\n' '{"displays":[],"error":"No displays"}'
        fi
        ;;
    get)
        [[ ${DDC_FAIL_GET_BUS:-} != "${2:-}" ]] || exit 1
        if [[ -s $OSD_DDC_STATE ]]; then
            cat "$OSD_DDC_STATE"
        else
            printf '%s\n' "${DDC_GET_VALUE:-40}"
        fi
        ;;
    set)
        if [[ -n ${DDC_SET_DELAY:-} ]]; then
            if ! mkdir "$OSD_DDC_PROBE" 2>/dev/null; then
                printf 'ddc-overlap\n' >>"$OSD_TEST_LOG"
            fi
            sleep "$DDC_SET_DELAY"
            rmdir "$OSD_DDC_PROBE" 2>/dev/null || true
        fi
        printf '%s\n' "${3:-0}" >"$OSD_DDC_STATE"
        ;;
    *) exit 2 ;;
esac
SH

cat >"$scratch/bin/hyprctl" <<'SH'
#!/bin/bash
printf 'hyprctl' >>"$OSD_TEST_LOG"
printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
printf '\n' >>"$OSD_TEST_LOG"
printf '[{"name":"%s","focused":true}]\n' "${FOCUSED_MONITOR:-DP-2}"
SH

cat >"$scratch/bin/notify-send" <<'SH'
#!/bin/bash
printf 'notify-send' >>"$OSD_TEST_LOG"
printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
printf '\n' >>"$OSD_TEST_LOG"
SH

cat >"$scratch/bin/playerctl" <<'SH'
#!/bin/bash
printf 'playerctl' >>"$OSD_TEST_LOG"
printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
printf '\n' >>"$OSD_TEST_LOG"
if [[ $1 == "metadata" ]]; then
    printf '%s\n' "${PLAYER_OUTPUT:-Horizon — Tycho}"
elif [[ $1 == "status" ]]; then
    printf '%s\n' "${PLAYER_STATUS:-Playing}"
fi
SH

cat >"$scratch/bin/pw-play" <<'SH'
#!/bin/bash
printf 'pw-play' >>"$OSD_TEST_LOG"
printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
printf '\n' >>"$OSD_TEST_LOG"
SH

cat >"$scratch/bin/qs" <<'SH'
#!/bin/bash
printf 'qs' >>"$OSD_TEST_LOG"
printf ' <%s>' "$@" >>"$OSD_TEST_LOG"
printf '\n' >>"$OSD_TEST_LOG"
[[ ${OSD_TEST_FAIL_QS:-false} != true ]]
SH

chmod +x "$scratch/bin/"*

# The blip and the over-amplification limit are both read out of Panama's own
# settings.json, so every run below gets its own config root. Without this the
# helper would read Gabriel's real preferences and the assertions would pass or
# fail depending on which switches he happens to have on.
blip_sound="$scratch/blip.oga"
: >"$blip_sound"
mkdir -p "$scratch/config-default"

# Write a settings.json for one run. No arguments means no file at all, which
# is what a fresh install looks like: the helper must fall back to the schema
# defaults rather than treating an absent file as an error.
settings_root() {
    local name="$1" body="${2:-}" root="$scratch/config-$name"
    rm -rf "$root"
    mkdir -p "$root/panama"
    [[ -n "$body" ]] && printf '%s\n' "$body" >"$root/panama/settings.json"
    printf '%s' "$root"
}

run_helper() {
    local runtime="${OSD_RUNTIME_DIR:-$scratch/runtime-default}"
    mkdir -p "$runtime"
    PATH="$scratch/bin:$PATH" OSD_TEST_LOG="$log" \
        XDG_CONFIG_HOME="${OSD_CONFIG_HOME:-$scratch/config-default}" \
        PANAMA_OSD_BLIP_SOUND="${OSD_BLIP_SOUND:-$blip_sound}" \
        OSD_TEST_FAIL_QS="${OSD_TEST_FAIL_QS:-false}" \
        PANAMA_OSD_STRICT="${PANAMA_OSD_STRICT:-false}" \
        PANAMA_OSD_BRIGHTNESS_HELPER="$scratch/bin/panama-brightness" \
        PANAMA_OSD_RUNTIME_DIR="$runtime" \
        OSD_DDC_STATE="$runtime/ddc-state" \
        OSD_DDC_PROBE="$runtime/ddc-probe" \
        BACKLIGHT_AVAILABLE="${BACKLIGHT_AVAILABLE:-true}" \
        DDC_LIST_JSON="${DDC_LIST_JSON:-}" \
        DDC_GET_VALUE="${DDC_GET_VALUE:-40}" \
        DDC_FAIL_GET_BUS="${DDC_FAIL_GET_BUS:-}" \
        DDC_SET_DELAY="${DDC_SET_DELAY:-}" \
        FOCUSED_MONITOR="${FOCUSED_MONITOR:-DP-2}" \
        "$helper" "$@"
}

assert_line() {
    local expected="$1"
    grep -Fqx -- "$expected" "$log" || {
        printf 'osd helper contract: missing call\n%s\nactual:\n' "$expected" >&2
        cat "$log" >&2
        exit 1
    }
}

# The blip is backgrounded and never waited on -- deliberately, so it cannot sit
# between the key press and the OSD. Which means the line may land after the
# helper has already exited, and asserting it needs a moment rather than an
# instant. Waiting here also keeps a slow blip from bleeding into the next
# case's freshly truncated log.
await_line() {
    local expected="$1"
    for _ in $(seq 1 60); do
        grep -Fqx -- "$expected" "$log" && return 0
        sleep 0.05
    done
    printf 'osd helper contract: missing call\n%s\nactual:\n' "$expected" >&2
    cat "$log" >&2
    exit 1
}

refute_line() {
    local unexpected="$1" why="$2"
    if grep -Fq -- "$unexpected" "$log"; then
        printf 'osd helper contract: %s\nunexpected: %s\nactual:\n' "$why" "$unexpected" >&2
        cat "$log" >&2
        exit 1
    fi
}

: >"$log"
run_helper volume up 6
assert_line 'wpctl <set-volume> <-l> <1> <@DEFAULT_AUDIO_SINK@> <6%+>'
assert_line 'wpctl <get-volume> <@DEFAULT_AUDIO_SINK@>'
assert_line 'qs <ipc> <call> <osd> <progress> <volume> <58> <100> <58%>'

: >"$log"
WPCTL_OUTPUT='Volume: 0.58 [MUTED]' run_helper volume toggle
assert_line 'wpctl <set-mute> <@DEFAULT_AUDIO_SINK@> <toggle>'
assert_line 'qs <ipc> <call> <osd> <progress> <volume-muted> <58> <100> <Muted>'

: >"$log"
WPCTL_OUTPUT='Volume: 0.72 [MUTED]' run_helper microphone toggle
assert_line 'wpctl <set-mute> <@DEFAULT_AUDIO_SOURCE@> <toggle>'
assert_line 'qs <ipc> <call> <osd> <progress> <microphone-muted> <72> <100> <Muted>'

# ── Over-amplification: the ceiling is a setting, not a constant ─────────────
# `wpctl set-volume` clamps to 1.0 unless told otherwise, and it clamps the
# *result* -- so the limit has to be on the down step too. Without it, coming
# down from 130% would snap to 100% instead of stepping to 124%, which reads as
# the slider jumping on its own.
: >"$log"
OSD_CONFIG_HOME="$(settings_root overamp '{"overAmplification": true}')" \
    run_helper volume up 6
assert_line 'wpctl <set-volume> <-l> <1.5> <@DEFAULT_AUDIO_SINK@> <6%+>'

: >"$log"
OSD_CONFIG_HOME="$(settings_root overamp '{"overAmplification": true}')" \
    run_helper volume down 6
assert_line 'wpctl <set-volume> <-l> <1.5> <@DEFAULT_AUDIO_SINK@> <6%->'

# The microphone is not part of the bargain: no amount of gain past 100% makes
# a capture device better, and the Sound page's input slider stays 0-100 to
# match.
: >"$log"
OSD_CONFIG_HOME="$(settings_root overamp '{"overAmplification": true}')" \
    run_helper microphone up 6
assert_line 'wpctl <set-volume> <-l> <1> <@DEFAULT_AUDIO_SOURCE@> <6%+>'
refute_line '<-l> <1.5> <@DEFAULT_AUDIO_SOURCE@>' \
    'over-amplification leaked onto the microphone'

: >"$log"
OSD_CONFIG_HOME="$(settings_root plain '{"overAmplification": false}')" \
    run_helper volume up 6
assert_line 'wpctl <set-volume> <-l> <1> <@DEFAULT_AUDIO_SINK@> <6%+>'

# A settings file that predates the key, and a settings file that is not JSON
# at all, both mean "off" rather than "no volume keys work today".
: >"$log"
OSD_CONFIG_HOME="$(settings_root nokey '{"barBackdrop": true}')" run_helper volume up 6
assert_line 'wpctl <set-volume> <-l> <1> <@DEFAULT_AUDIO_SINK@> <6%+>'

: >"$log"
OSD_CONFIG_HOME="$(settings_root broken '{not json')" run_helper volume up 6
assert_line 'wpctl <set-volume> <-l> <1> <@DEFAULT_AUDIO_SINK@> <6%+>'
assert_line 'qs <ipc> <call> <osd> <progress> <volume> <58> <100> <58%>'

# ── The volume blip ─────────────────────────────────────────────────────────
# Default on, per the schema, so a settings.json that has never been written
# still clicks. Fire-and-forget: the blip must never gate the OSD.
: >"$log"
run_helper volume up 6
await_line "pw-play <$blip_sound>"
assert_line 'qs <ipc> <call> <osd> <progress> <volume> <58> <100> <58%>'

: >"$log"
run_helper volume down 6
await_line "pw-play <$blip_sound>"

: >"$log"
WPCTL_OUTPUT='Volume: 0.58' run_helper volume toggle
await_line "pw-play <$blip_sound>"

: >"$log"
OSD_CONFIG_HOME="$(settings_root silent '{"volumeChangeBlip": false}')" \
    run_helper volume up 6
refute_line 'pw-play' 'the blip played with volumeChangeBlip off'
assert_line 'qs <ipc> <call> <osd> <progress> <volume> <58> <100> <58%>'

# Brightness and the microphone are not volume changes.
: >"$log"
run_helper brightness up 5
refute_line 'pw-play' 'a brightness step played the volume blip'

: >"$log"
WPCTL_OUTPUT='Volume: 0.72' run_helper microphone up 6
refute_line 'pw-play' 'a microphone step played the volume blip'

# A distribution without the freedesktop sound theme has no file to play. That
# is a silent desktop, not a broken volume key.
: >"$log"
OSD_BLIP_SOUND="$scratch/nothing-here.oga" run_helper volume up 6
refute_line 'pw-play' 'the blip ran against a file that does not exist'
assert_line 'wpctl <set-volume> <-l> <1> <@DEFAULT_AUDIO_SINK@> <6%+>'
assert_line 'qs <ipc> <call> <osd> <progress> <volume> <58> <100> <58%>'

: >"$log"
run_helper brightness up 5
assert_line 'brightnessctl <-m> <-c> <backlight>'
assert_line 'brightnessctl <-e4> <-n2> <-c> <backlight> <set> <5%+>'
assert_line 'qs <ipc> <call> <osd> <progress> <brightness> <50> <100> <50%>'
if grep -Fq 'panama-brightness' "$log"; then
    printf 'osd helper contract: DDC fallback ran despite a native backlight\n' >&2
    exit 1
fi

: >"$log"
OSD_RUNTIME_DIR="$scratch/runtime-ddc" \
BACKLIGHT_AVAILABLE=false \
DDC_LIST_JSON='{"displays":[{"bus":3,"connector":"HDMI-A-1","value":35},{"bus":5,"connector":"DP-2","value":40}],"error":""}' \
run_helper brightness up 5
assert_line 'hyprctl <-j> <monitors>'
assert_line 'panama-brightness <list>'
assert_line 'panama-brightness <get> <5>'
assert_line 'panama-brightness <set> <5> <45>'
assert_line 'qs <ipc> <call> <osd> <progress> <brightness> <45> <100> <45%>'

# A cached bus avoids the expensive display scan on subsequent key presses.
: >"$log"
OSD_RUNTIME_DIR="$scratch/runtime-ddc" \
BACKLIGHT_AVAILABLE=false \
DDC_LIST_JSON='{"displays":[{"bus":3,"connector":"HDMI-A-1","value":35},{"bus":5,"connector":"DP-2","value":45}],"error":""}' \
run_helper brightness down 5
assert_line 'panama-brightness <get> <5>'
assert_line 'panama-brightness <set> <5> <40>'
assert_line 'qs <ipc> <call> <osd> <progress> <brightness> <40> <100> <40%>'
if grep -Fq 'panama-brightness <list>' "$log"; then
    printf 'osd helper contract: cached DDC bus triggered another display scan\n' >&2
    exit 1
fi

# A disconnected cached monitor is discarded and rediscovered once.
mkdir -p "$scratch/runtime-ddc-stale"
printf '9\tDP-9\n' >"$scratch/runtime-ddc-stale/brightness-bus"
: >"$log"
OSD_RUNTIME_DIR="$scratch/runtime-ddc-stale" \
BACKLIGHT_AVAILABLE=false \
DDC_FAIL_GET_BUS=9 \
DDC_LIST_JSON='{"displays":[{"bus":5,"connector":"DP-2","value":40}],"error":""}' \
run_helper brightness up 5
assert_line 'panama-brightness <get> <9>'
assert_line 'panama-brightness <list>'
assert_line 'panama-brightness <get> <5>'
assert_line 'panama-brightness <set> <5> <45>'

# If the focused output is not DDC-capable, use the first discovered display.
: >"$log"
OSD_RUNTIME_DIR="$scratch/runtime-ddc-first" \
BACKLIGHT_AVAILABLE=false \
FOCUSED_MONITOR='eDP-1' \
DDC_GET_VALUE=35 \
DDC_LIST_JSON='{"displays":[{"bus":3,"connector":"HDMI-A-1","value":35},{"bus":5,"connector":"DP-2","value":40}],"error":""}' \
run_helper brightness down 10
assert_line 'panama-brightness <get> <3>'
assert_line 'panama-brightness <set> <3> <25>'
assert_line 'qs <ipc> <call> <osd> <progress> <brightness> <25> <100> <25%>'

# Permission and discovery errors must be visible, never masquerade as 0%.
: >"$log"
OSD_RUNTIME_DIR="$scratch/runtime-ddc-error" \
BACKLIGHT_AVAILABLE=false \
DDC_LIST_JSON='{"displays":[],"error":"Run sudo udevadm control --reload-rules && sudo udevadm trigger --subsystem-match=i2c-dev --subsystem-match=drm"}' \
run_helper brightness up 5
assert_line 'qs <ipc> <call> <osd> <message> <dialog-warning-symbolic> <Brightness needs permission>'
assert_line 'notify-send <--app-name=Panama> <--icon=display-brightness-symbolic> <Brightness unavailable> <Run sudo udevadm control --reload-rules && sudo udevadm trigger --subsystem-match=i2c-dev --subsystem-match=drm>'
if grep -Fq 'osd> <progress> <brightness>' "$log"; then
    printf 'osd helper contract: unavailable brightness rendered a false percentage\n' >&2
    exit 1
fi

# Separate key-repeat processes must not overlap their DDC transactions.
: >"$log"
OSD_RUNTIME_DIR="$scratch/runtime-ddc-lock" \
BACKLIGHT_AVAILABLE=false \
DDC_SET_DELAY=0.15 \
DDC_LIST_JSON='{"displays":[{"bus":5,"connector":"DP-2","value":40}],"error":""}' \
run_helper brightness up 5 &
first_pid=$!
OSD_RUNTIME_DIR="$scratch/runtime-ddc-lock" \
BACKLIGHT_AVAILABLE=false \
DDC_SET_DELAY=0.15 \
DDC_LIST_JSON='{"displays":[{"bus":5,"connector":"DP-2","value":40}],"error":""}' \
run_helper brightness up 5 &
second_pid=$!
wait "$first_pid"
wait "$second_pid"
if grep -Fqx 'ddc-overlap' "$log"; then
    printf 'osd helper contract: concurrent DDC transactions overlapped\n' >&2
    exit 1
fi
if [[ $(<"$scratch/runtime-ddc-lock/ddc-state") != 50 ]]; then
    printf 'osd helper contract: serialized key repeats did not both apply\n' >&2
    exit 1
fi

: >"$log"
run_helper media next
assert_line 'playerctl <next>'
assert_line 'qs <ipc> <call> <osd> <message> <media-next> <Horizon — Tycho>'

: >"$log"
run_helper message notifications-disabled-symbolic 'Do Not Disturb On'
assert_line 'qs <ipc> <call> <osd> <message> <notifications-disabled-symbolic> <Do Not Disturb On>'

: >"$log"
if OSD_TEST_FAIL_QS=true PANAMA_OSD_STRICT=1 run_helper message dialog-error-symbolic 'Strict failure'; then
    printf 'osd helper contract: strict delivery swallowed an IPC failure\n' >&2
    exit 1
fi

: >"$log"
OSD_TEST_FAIL_QS=true run_helper message dialog-information-symbolic 'Best effort'

printf 'osd helper contract: PASS\n'