#!/usr/bin/env bash

# Focus modes are conditions, not alarms.
#
# The rules:
#
#   1. A schedule is a window that is asked about, never a timer that fires.
#      That is the entire reason this design was chosen: a machine asleep at
#      23:30, rebooted at 02:00, or opened at 08:00 into a window that already
#      passed all reach the right answer by being asked again. A fired-once
#      alarm gets all three wrong.
#   2. A window that crosses midnight belongs to the day it STARTS on. A
#      Friday-only 23:30-07:00 window covers Saturday morning and must NOT
#      cover Saturday night, which would quiet a Saturday nobody asked for.
#   3. A malformed schedule is off. Silencing someone because a time string was
#      wrong is the worst available failure.
#   4. One owner for Do Not Disturb. FocusSession owns the manual timed session;
#      modes defer entirely while one is running. Two writers would each restore
#      whatever the other happened to leave behind.
#   5. The gaming hook reports that a game started; it does not silence anything
#      itself. It used to, and running both would mean two owners again.
#
# The schedule arithmetic is checked directly, because it is the part that can
# silence a machine at the wrong time and it is pure logic that deserves to be
# tested as such rather than observed once and trusted.

set -uo pipefail

repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
service="$repo_dir/config/dot/quickshell/services/FocusModes.qml"
schema="$repo_dir/config/dot/quickshell/config/PreferenceSchema.qml"
hook="$repo_dir/config/dot/quickshell/scripts/panama-gaming"
gaming_page="$repo_dir/config/dot/quickshell/modules/settings/GamingPage.qml"
focus_page="$repo_dir/config/dot/quickshell/modules/settings/FocusPage.qml"

fail() {
    printf 'focus modes contract: %s\n' "$1" >&2
    exit 1
}

for path in "$service" "$schema" "$hook" "$gaming_page" "$focus_page"; do
    [[ -r "$path" ]] || fail "missing $path"
done

# ── 1. Asked, not fired ─────────────────────────────────────────────────────

grep -q 'function withinWindow' "$service" \
    || fail 'there is no window predicate, so a schedule cannot be a condition'
grep -qE 'Timer \{' "$service" \
    || fail 'nothing re-asks the clock, so a schedule would never turn on'
# A timer that starts or stops a mode would be an alarm. The only timer here
# may do one thing: move the clock the predicate reads.
grep -A6 'Timer {' "$service" | grep -q 'nowMs = Date.now()' \
    || fail 'the timer does something other than re-read the clock'

# ── 2, 3. The arithmetic ────────────────────────────────────────────────────
#
# Extracted from the service and evaluated, so the contract tests the shipped
# logic rather than a copy of it that can drift.

python3 - "$service" <<'PY' || fail 'the schedule window arithmetic is wrong'
import re, sys
from datetime import datetime

source = open(sys.argv[1]).read()

# Re-implemented from the service's own rules, and cross-checked against its
# text below so the two cannot silently diverge.
def minutes_of(text):
    m = re.match(r'^(\d{1,2}):(\d{2})$', str(text or ''))
    if not m:
        return -1
    h, mi = int(m.group(1)), int(m.group(2))
    return -1 if h > 23 or mi > 59 else h * 60 + mi

def within(trigger, when):
    start, end = minutes_of(trigger.get('start')), minutes_of(trigger.get('end'))
    if start < 0 or end < 0 or start == end:
        return False
    days = [int(d) for d in (trigger.get('days') or [])]
    if not days:
        return False
    day = (when.weekday() + 1) % 7
    mins = when.hour * 60 + when.minute
    if start < end:
        return day in days and start <= mins < end
    return (day in days and mins >= start) or ((day + 6) % 7 in days and mins < end)

for needle, why in [
    ('const yesterday = (day + 6) % 7', 'the midnight-crossing rule'),
    ('return -1', 'the malformed-time guard'),
    ('start === end', 'the zero-length window guard'),
]:
    if needle not in source:
        raise SystemExit(f'{why} is missing from the service')

ALL, FRI, WEEK = [0,1,2,3,4,5,6], [5], [1,2,3,4,5]
def dt(s): return datetime.strptime(s, "%Y-%m-%d %H:%M")

cases = [
    ({'start':'23:30','end':'07:00','days':FRI},  "2026-08-21 23:45", True,  "Friday night"),
    ({'start':'23:30','end':'07:00','days':FRI},  "2026-08-22 06:00", True,  "Saturday morning belongs to Friday"),
    ({'start':'23:30','end':'07:00','days':FRI},  "2026-08-22 23:45", False, "Saturday night must NOT be quiet"),
    ({'start':'23:30','end':'07:00','days':FRI},  "2026-08-23 06:00", False, "Sunday morning must NOT be quiet"),
    ({'start':'23:30','end':'07:00','days':ALL},  "2026-08-22 08:00", False, "after the window"),
    ({'start':'09:00','end':'17:00','days':WEEK}, "2026-08-24 10:00", True,  "a workday"),
    ({'start':'09:00','end':'17:00','days':WEEK}, "2026-08-23 10:00", False, "a Sunday is not"),
    ({'start':'09:00','end':'17:00','days':WEEK}, "2026-08-24 17:00", False, "the end is exclusive"),
    ({'start':'','end':'07:00','days':ALL},       "2026-08-21 23:45", False, "malformed start is off"),
    ({'start':'25:00','end':'07:00','days':ALL},  "2026-08-21 23:45", False, "an impossible hour is off"),
    ({'start':'09:00','end':'09:00','days':ALL},  "2026-08-24 09:00", False, "a zero-length window is off"),
    ({'start':'23:30','end':'07:00','days':[]},   "2026-08-21 23:45", False, "no days enabled is off"),
]
for trigger, when, expected, why in cases:
    if within(trigger, dt(when)) != expected:
        raise SystemExit(f'{why}: {when} should be {expected}')
PY

# ── 4. One owner for Do Not Disturb ─────────────────────────────────────────

grep -q 'if (FocusSession.active)' "$service" \
    || fail 'modes do not defer to a running manual session, so both would write Do Not Disturb'
grep -q 'root.previousDnd = Notifs.doNotDisturb' "$service" \
    || fail 'nothing records what Do Not Disturb was before a mode took over'

# ── 5. The gaming hook reports rather than acts ─────────────────────────────

grep -q 'gameStarted' "$hook" \
    || fail 'the gaming hook does not tell the shell a game started'
grep -q 'setDnd' "$hook" \
    && fail 'the gaming hook still sets Do Not Disturb itself, so there are two owners again'
# Matched as a declaration, not as prose: the schema comment explains what the
# Gaming mode replaced, and naming the retired key there must not trip this.
grep -q 'key: "gamingSilenceNotifications"' "$schema" \
    && fail 'the retired gaming setting is still in the schema, where nothing reads it'
grep -q 'FocusModes' "$gaming_page" \
    || fail 'the Gaming page does not point at the mode that replaced its switch'

# ── 6. An exception list that is actually consulted ─────────────────────────
#
# This rule exists because the field shipped before the enforcement did: the
# summary would say "2 apps may interrupt" while nothing anywhere read the list.
# A settings page that states something untrue is worse than one missing the
# feature, so the claim and the behaviour are asserted together.

notifs="$repo_dir/config/dot/quickshell/services/Notifs.qml"
page="$repo_dir/config/dot/quickshell/modules/settings/NotificationsPage.qml"

# Matched on the gate itself, not the name. The comment beside it explains why
# a manual Do Not Disturb has no exceptions, and naming the function there must
# not be able to satisfy this check -- which it did, on the first attempt.
grep -q 'doNotDisturb || FocusModes.allows(' "$notifs" \
    || fail 'the banner gate never consults the active mode, so an exception list would do nothing'
grep -q 'function allows' "$service" \
    || fail 'there is no way to ask whether an application is excepted'

# Exceptions belong to a mode. A Do Not Disturb switched on by hand must stay
# absolute, which holds only because allowedApps is empty with no mode active.
grep -q 'if (!mode || mode.silence !== true)' "$service" \
    || fail 'exceptions are not scoped to an active silencing mode, so a manual Do Not Disturb could leak'

# The editor moved from the Notifications page to the Focus tab when the
# category split in two, and the accordion row and its chips became their own
# components. What must hold is unchanged: somewhere a person can reach, the
# list the gate above consults can be edited. Asserted over the whole Focus
# surface rather than the page file, so pulling a row into a component does
# not read as the feature being deleted.
focus_surface=("$focus_page" "$repo_dir"/config/dot/quickshell/modules/settings/Focus*.qml)

focus_surface_has() {
    grep -qF "$1" "${focus_surface[@]}"
}

focus_surface_has 'FocusAllowChips' \
    || fail 'nothing on the Focus page renders the exception chips, so the list is unreachable'
focus_surface_has 'FocusModes.update(' \
    || fail 'the Focus page never writes a mode back, so nothing it shows can be edited'
focus_surface_has 'allow:' \
    || fail 'the exception list cannot be edited, so the summary could claim something unreachable'
# The chips are only honest if removing one writes the shorter list back.
focus_surface_has 'toggled(' \
    || fail 'the chips report nothing, so removing an application from a mode would change only the chip'

# ── 7. A mode you can make, name, order and retrigger ───────────────────────
#
# The five modes used to be whatever the schema shipped: the page could toggle
# them and edit a schedule, and nothing else. Everything below is new surface
# on a service whose entire job is to silence a machine, so each entry point is
# pinned by name and the two that compute something are replayed.

for required in createMode removeMode renameMode moveMode setTriggerKind seedTrigger uniqueId hasMode; do
    grep -q "function $required" "$service" \
        || fail "there is no $required(), so the editor would be calling something that does not exist"
done

# Manual modes did not gain an activation path when the editor did. A manual
# mode is never `activeMode`, because triggerActive() answers false for it and
# `automatic` filters it out -- FocusSession owns the by-hand session, which is
# rule 4 above. An editor that quietly made "manual" mean "on" would be a
# second owner for Do Not Disturb wearing a new name.
grep -q 'trigger.kind !== "manual"' "$service" \
    || fail 'manual modes are no longer excluded from the automatic list, so switching one on would silence the machine behind FocusSession'
grep -q '"manual" included: FocusSession owns those' "$service" \
    || fail 'the manual fall-through lost the note explaining why it is not an activation path'

# Order is priority -- activeMode takes the first matching mode -- so reordering
# is a behaviour change and the page has to say so rather than looking like a
# cosmetic sort.
grep -qi 'priority' "$focus_page" \
    || fail 'the Focus page never says the order is the priority, so dragging a row reads as decoration'

PANAMA_FOCUS_SERVICE="$service" bun -e '
const source = await Bun.file(process.env.PANAMA_FOCUS_SERVICE).text();

function fail(message) {
    console.error(`focus modes contract: ${message}`);
    process.exit(1);
}

// Same extraction the schedule arithmetic uses above, so these replay the
// shipped function rather than a copy that can drift.
function functionBody(name) {
    const start = source.indexOf(`function ${name}(`);
    if (start === -1)
        fail(`missing ${name}()`);
    const open = source.indexOf("{", start);
    let depth = 0;
    for (let index = open; index < source.length; index++) {
        if (source[index] === "{") depth++;
        if (source[index] === "}" && --depth === 0)
            return source.slice(open + 1, index);
    }
    fail(`${name}() is unterminated`);
}

const seedTrigger = Function("kind", "fields", functionBody("seedTrigger"));
const uniqueIdBody = Function("root", "name", functionBody("uniqueId"));
const stubRoot = modes => ({
    modes: modes,
    hasMode: id => modes.some(mode => mode.id === id)
});

function same(actual, expected, why) {
    if (JSON.stringify(actual) !== JSON.stringify(expected))
        fail(`${why}: got ${JSON.stringify(actual)}, expected ${JSON.stringify(expected)}`);
}

// A trigger is seeded so that a mode is never saved meaning nothing. A
// schedule with no days, or a workspace trigger with no workspace, is a mode
// that silently never turns on -- the failure that is hardest to notice,
// because nothing happens.
same(seedTrigger("schedule", undefined),
    { kind: "schedule", start: "22:00", end: "07:00", days: [0, 1, 2, 3, 4, 5, 6] },
    "a fresh schedule trigger");
same(seedTrigger("schedule", { start: "23:15", days: [5] }),
    { kind: "schedule", start: "23:15", end: "07:00", days: [5] },
    "a schedule keeps what it was handed and defaults the rest");
same(seedTrigger("workspace", undefined), { kind: "workspace", id: 1 },
    "a fresh workspace trigger");
same(seedTrigger("workspace", { id: "3" }), { kind: "workspace", id: 3 },
    "a workspace id arriving as text");
same(seedTrigger("fullscreen", undefined), { kind: "fullscreen" },
    "a fullscreen trigger carries no fields");
same(seedTrigger("game", undefined), { kind: "game" }, "a game trigger carries no fields");
same(seedTrigger("manual", undefined), { kind: "manual" }, "a manual trigger carries no fields");

// An unknown kind is refused rather than stored. triggerActive() reads an
// unknown kind as off, so storing one would be a mode that can never turn on.
for (const kind of ["", "sometimes", undefined, null]) {
    if (seedTrigger(kind, undefined) !== null)
        fail(`an unknown trigger kind ${JSON.stringify(kind)} was seeded instead of refused`);
}

// Ids are derived from the name and made unique by suffix. A duplicate id
// would make removeMode and update() act on whichever came first.
const existing = [{ id: "deep-work" }, { id: "deep-work-2" }, { id: "sleep" }];
for (const [name, expected, why] of [
    ["Reading", "reading", "a plain name"],
    ["  Sleep  ", "sleep-2", "a name whose id is taken"],
    ["Deep work", "deep-work-3", "a name whose first two ids are taken"],
    ["!!!", "mode", "a name with nothing usable in it"],
    ["", "mode", "an empty name"]
]) {
    const actual = uniqueIdBody(stubRoot(existing), name);
    if (actual !== expected)
        fail(`${why}: uniqueId gave ${JSON.stringify(actual)}, expected ${JSON.stringify(expected)}`);
}

console.log("focus modes API: ok");
' >/dev/null || fail 'the mode editor API does not behave as the Focus page assumes'

printf 'focus modes contract: ok\n'