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

chmod +x "$scratch/bin/"*

run_helper() {
    local runtime="${OSD_RUNTIME_DIR:-$scratch/runtime-default}"
    mkdir -p "$runtime"
    PATH="$scratch/bin:$PATH" OSD_TEST_LOG="$log" \
        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
    }
}

: >"$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>'

: >"$log"
run_helper brightness up 5
assert_line 'brightnessctl <-m> <-c> <backlight>'
assert_line 'brightnessctl <-e4> <-n2> <-c> <backlight> <set> <5%+>'
assert_line 'qs <ipc> <call> <osd> <progress> <brightness> <50> <100> <50%>'
if grep -Fq 'panama-brightness' "$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'