#!/usr/bin/env bash

set -euo pipefail

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

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

pages=(Home Displays Connectivity Sound Notifications ScreenIntelligence Health About)
for page in "${pages[@]}"; do
    page_file="$repo_dir/config/dot/quickshell/modules/settings/${page}Page.qml"
    [[ -f "$page_file" ]] || fail "${page}Page.qml is missing"

    root_type="$(awk '
        /^import / { next }
        /^[[:space:]]*\/\// { next }
        /^[[:space:]]*$/ { next }
        match($0, /^[[:space:]]*([A-Za-z][A-Za-z0-9]*)[[:space:]]*\{/, found) {
            print found[1]
            exit
        }
    ' "$page_file")"
    [[ "$root_type" == "SettingsPage" ]] \
        || fail "${page}Page.qml root is ${root_type:-unknown}, expected SettingsPage"
    ! rg -q '^[[:space:]]*Flickable[[:space:]]*\{' "$page_file" \
        || fail "${page}Page.qml still copies the page Flickable scaffold"
done

require_row() {
    local file="$1"
    local row_type="$2"
    local setting="$3"

    python3 - "$file" "$row_type" "$setting" <<'PY' || \
        fail "$(basename "$file") is missing $row_type for $setting"
import re
import sys

text = open(sys.argv[1], encoding="utf-8").read()
row_type = re.escape(sys.argv[2])
setting = re.escape(sys.argv[3])
pattern = rf"{row_type}\s*\{{(?:(?!\n\s*[A-Z][A-Za-z0-9]*\s*\{{).)*?setting\s*:\s*\"{setting}\""
raise SystemExit(0 if re.search(pattern, text, re.S) else 1)
PY
}

home_page="$repo_dir/config/dot/quickshell/modules/settings/HomePage.qml"
require_row "$home_page" ChoiceRow temperatureUnit
require_row "$home_page" SliderRow weatherRefreshMinutes
# vitalsIntervalMs moved to Appearance, beside the toggles it governs. It sat
# on Home while showCpu/showMemory/showGpu sat on Appearance -- one concept
# across two pages, which the ownership rule forbids and which made a search
# for it open a page that did not contain it.
appearance_page="$repo_dir/config/dot/quickshell/modules/settings/AppearancePage.qml"
require_row "$appearance_page" SliderRow vitalsIntervalMs

notifications_page="$repo_dir/config/dot/quickshell/modules/settings/NotificationsPage.qml"
for setting in notificationTimeoutMs notificationTimeoutCriticalMs notificationHistoryLimit maxVisibleToasts; do
    require_row "$notifications_page" SliderRow "$setting"
done
python3 - "$notifications_page" <<'PY' || fail 'critical notification timeout does not render zero as Never'
import re
import sys

text = open(sys.argv[1], encoding="utf-8").read()
block = re.search(
    r'SliderRow\s*\{(?:(?!\n\s*[A-Z][A-Za-z0-9]*\s*\{).)*?'
    r'setting\s*:\s*"notificationTimeoutCriticalMs"(?P<tail>.*?)\n\s*\}',
    text,
    re.S,
)
raise SystemExit(0 if block and re.search(r'zeroLabel\s*:\s*"Never"', block.group(0)) else 1)
PY

intelligence_page="$repo_dir/config/dot/quickshell/modules/settings/ScreenIntelligencePage.qml"
require_row "$intelligence_page" ChoiceRow screenshotDir
require_row "$intelligence_page" ChoiceRow recordingDir
require_row "$intelligence_page" ChoiceRow recorderArgs

# The source-only contract is safe during a shared Quickshell quiet window.
# The existing compositor integration checks remain available explicitly.
if [[ "${PANAMA_SETTINGS_STATIC_ONLY:-0}" == "1" ]]; then
    printf 'settings pages contract: PASS (static)\n'
    exit 0
fi

state_home="$(mktemp -d /tmp/panama-settings-pages-state.XXXXXX)"
source_config_path="$repo_dir/config/dot/quickshell"
config_path="$state_home/quickshell"
harness="$config_path/settings-pages-harness.qml"
test_bin="$state_home/bin"
shell_log="$state_home/quickshell.log"
production_config_path="$HOME/.config/quickshell/shell.qml"
harness_pid=""
harness_shell_id=""
production_before=""

cleanup_bootstrap() {
    rm -rf "$state_home"
}
trap cleanup_bootstrap EXIT

mkdir -p "$test_bin"
cp -a "$source_config_path" "$config_path"
python3 - "$config_path/shell.qml" "$harness" "$$" <<'PY'
import sys

source_path, harness_path, identity = sys.argv[1:]
source = open(source_path, encoding="utf-8").read()
needle = "ShellRoot {\n"
replacement = (
    needle
    + f'    readonly property string settingsPagesHarnessIdentity: "settings-pages-contract-{identity}"\n'
)
if source.count(needle) != 1:
    raise SystemExit("shell.qml does not have exactly one ShellRoot")
with open(harness_path, "w", encoding="utf-8") as handle:
    handle.write(source.replace(needle, replacement, 1))
PY

cat >"$config_path/scripts/panama-home-assistant" <<'EOF'
#!/usr/bin/env bash
set -euo pipefail

case "${1:-}" in
    catalog)
        printf '%s\n' '{"ok":false,"error":"test-helper"}'
        ;;
    toggle|brightness)
        printf '%s\n' '{"ok":true}'
        ;;
esac
EOF
chmod +x "$config_path/scripts/panama-home-assistant"

cat >"$test_bin/hyprctl" <<'EOF'
#!/usr/bin/env bash
set -euo pipefail

if [[ "${1:-}" == "-j" && "${2:-}" == "monitors" ]]; then
    printf '%s\n' '[{"focused":true,"name":"TEST-1","description":"Settings contract","width":1920,"height":1080,"refreshRate":60,"scale":1,"currentFormat":"XRGB8888","colorManagementPreset":"srgb","vrr":false}]'
    exit 0
fi
if [[ "${1:-}" == "keyword" ]]; then
    exit 0
fi
exec /usr/sbin/hyprctl "$@"
EOF
chmod +x "$test_bin/hyprctl"

cat >"$test_bin/flatpak" <<'EOF'
#!/usr/bin/env bash
set -euo pipefail

if [[ "${1:-}" == "info" ]]; then
    exit 1
fi
exit 97
EOF
chmod +x "$test_bin/flatpak"

qs_for_test() {
    if [[ "${1:-}" == "ipc" && "$harness_pid" =~ ^[0-9]+$ ]]; then
        PATH="$test_bin:$PATH" XDG_STATE_HOME="$state_home" \
            qs -p "$harness" ipc --pid "$harness_pid" "${@:2}"
    else
        PATH="$test_bin:$PATH" XDG_STATE_HOME="$state_home" \
            qs -p "$harness" "$@"
    fi
}

instances_for_path() {
    local expected_path="$1" listing

    listing="$(qs list --all 2>/dev/null)" || return 1
    awk -v expected="$expected_path" '
        /^Instance / { pid = ""; shell_id = "" }
        /^[[:space:]]*Process ID:/ { pid = $3 }
        /^[[:space:]]*Shell ID:/ { shell_id = $3 }
        /^[[:space:]]*Config path:/ {
            path = $0
            sub(/^[[:space:]]*Config path: /, "", path)
            if (path == expected && pid ~ /^[0-9]+$/ && shell_id != "")
                print pid "|" shell_id
        }
    ' <<<"$listing"
}

harness_identity_matches() {
    local current

    [[ "$harness_pid" =~ ^[0-9]+$ && -n "$harness_shell_id" ]] || return 1
    current="$(instances_for_path "$harness")" || return 1
    grep -Fxq "$harness_pid|$harness_shell_id" <<<"$current"
}

production_is_preserved() {
    local current record pid shell_id

    current="$(instances_for_path "$production_config_path")" || return 1
    while IFS='|' read -r pid shell_id; do
        [[ -n "$pid" ]] || continue
        kill -0 "$pid" >/dev/null 2>&1 || return 1
        record="$pid|$shell_id"
        grep -Fxq "$record" <<<"$current" || return 1
    done <<<"$production_before"
}

stop_harness() {
    local remaining

    if harness_identity_matches; then
        kill "$harness_pid" >/dev/null 2>&1 || true
        for _ in $(seq 1 80); do
            ! kill -0 "$harness_pid" >/dev/null 2>&1 && break
            sleep 0.05
        done
        if kill -0 "$harness_pid" >/dev/null 2>&1 && harness_identity_matches; then
            kill -KILL "$harness_pid" >/dev/null 2>&1 || true
            for _ in $(seq 1 20); do
                ! kill -0 "$harness_pid" >/dev/null 2>&1 && break
                sleep 0.05
            done
        fi
    fi
    remaining="$(instances_for_path "$harness")" || return 1
    harness_pid=""
    harness_shell_id=""
    [[ -z "$remaining" ]]
}

cleanup() {
    local cleanup_ok=0

    stop_harness || cleanup_ok=1
    production_is_preserved || cleanup_ok=1
    if (( cleanup_ok == 0 )); then
        rm -rf "$state_home"
    else
        printf 'settings pages contract: isolated harness cleanup failed; retained %s\n' \
            "$state_home" >&2
    fi
    return "$cleanup_ok"
}
trap cleanup EXIT

start_test_shell() {
    local harness_instances production_pid production_shell_id

    harness_instances="$(instances_for_path "$harness")" \
        || fail 'could not inspect Quickshell instances before starting the runtime harness'
    [[ -z "$harness_instances" ]] \
        || fail 'an unexpected process already uses the runtime harness path'
    for _attempt in 1 2; do
        qs_for_test --daemonize >"$shell_log" 2>&1
        for _ in $(seq 1 80); do
            harness_instances="$(instances_for_path "$harness")" \
                || fail 'could not inspect the runtime harness instance'
            [[ -n "$harness_instances" ]] && break
            sleep 0.05
        done
        if [[ "$(wc -l <<<"$harness_instances")" == 1 && -n "$harness_instances" ]]; then
            IFS='|' read -r harness_pid harness_shell_id <<<"$harness_instances"
            [[ "$harness_pid" =~ ^[0-9]+$ ]] \
                || fail 'runtime harness did not expose a numeric PID'

            while IFS='|' read -r production_pid production_shell_id; do
                [[ -n "$production_pid" ]] || continue
                [[ "$harness_shell_id" != "$production_shell_id" ]] || {
                    stop_harness
                    fail 'runtime harness shares a Shell ID with production'
                }
            done <<<"$production_before"
            production_is_preserved || {
                stop_harness
                fail 'production changed before isolated page routing began'
            }

            for _ in $(seq 1 80); do
                if qs_for_test ipc show 2>/dev/null | rg '^target settings$' >/dev/null; then
                    return
                fi
                sleep 0.1
            done
        fi
        stop_harness || fail 'failed runtime harness attempt did not stop cleanly'
    done
    sed -n '1,200p' "$shell_log" >&2
    fail 'isolated branch shell did not start'
}

production_before="$(instances_for_path "$production_config_path")" \
    || fail 'could not list Quickshell instances for the production baseline'
production_is_preserved || fail 'could not capture a stable production instance set'
start_test_shell
qs_for_test ipc call home-assistant fixture ready >/dev/null
shell_pid="$harness_pid"
[[ "$shell_pid" =~ ^[0-9]+$ ]] || fail 'could not identify the branch shell process'

pages=(home appearance displays connectivity home-phone desktop sound notifications screen-intelligence shortcuts services about)
for page in "${pages[@]}"; do
    qs_for_test ipc call settings page "$page" >/dev/null
    for _ in $(seq 1 20); do
        [[ "$(qs_for_test ipc call settings status | jq -r .page)" == "$page" ]] && break
        sleep 0.1
    done
    [[ "$(qs_for_test ipc call settings status | jq -r .page)" == "$page" ]] || fail "$page did not route"
    /usr/sbin/hyprctl -j clients | jq -e --argjson pid "$shell_pid" \
        '[.[] | select(.pid == $pid and .title == "Settings" and .floating == false)] | length == 1' >/dev/null \
        || fail "$page created a missing, floating, or duplicate Settings window"
done

qs_for_test ipc call settings page '__unsupported__' >/dev/null
[[ "$(qs_for_test ipc call settings status | jq -r .page)" == "home" ]] || fail 'unsupported page did not fall back to Home'

/usr/sbin/hyprctl -j binds | jq -e '.[] | select(.description == "Settings" and .key == "I" and .modmask == 64)' >/dev/null \
    || fail 'Super+I is not registered as Panama Settings'
/usr/sbin/hyprctl -j binds | jq -e '.[] | select(.description == "Screen Intelligence" and .key == "S" and .modmask == 65)' >/dev/null \
    || fail 'Super+Shift+S is not registered as Screen Intelligence'

desktop_file="$HOME/.local/share/applications/panama-settings.desktop"
[[ -L "$desktop_file" || -f "$desktop_file" ]] || fail 'searchable desktop entry is not installed'
desktop-file-validate "$desktop_file" >/dev/null || fail 'desktop entry is invalid'
gnome_desktop_file="$HOME/.local/share/applications/gnome-settings-hyprland.desktop"
[[ -L "$gnome_desktop_file" || -f "$gnome_desktop_file" ]] || fail 'searchable GNOME Settings fallback is not installed'
desktop-file-validate "$gnome_desktop_file" >/dev/null || fail 'GNOME Settings fallback entry is invalid'
intelligence_desktop_file="$HOME/.local/share/applications/panama-screen-intelligence.desktop"
[[ -L "$intelligence_desktop_file" || -f "$intelligence_desktop_file" ]] || fail 'Screen Intelligence desktop entry is not installed'
desktop-file-validate "$intelligence_desktop_file" >/dev/null || fail 'Screen Intelligence desktop entry is invalid'

trap - EXIT
cleanup || fail 'runtime harness did not stop without disturbing production'
[[ ! -e "$state_home" ]] || fail 'temporary Settings state was not removed after shell exit'
production_pids="$(cut -d'|' -f1 <<<"$production_before" | paste -sd, -)"
[[ -n "$production_pids" ]] || production_pids="none"
printf 'settings pages contract: PASS (production PIDs preserved: %s)\n' "$production_pids"
