#!/usr/bin/env bash

# The one titlebar Panama draws.
#
# Settings is the only Panama window with a titlebar of its own, and it used to
# show three buttons: minimize, maximize, close. Two of those were lies.
# Hyprland has no minimize -- it receives the request and does nothing with it
# -- and maximize is meaningless in a tiler. Pressing them looked exactly like
# pressing a button that works.
#
# So the bar is close-only, it follows the same button-side preference GNOME
# applications get, and it can be turned off entirely: with `panamaTitlebar`
# false the window is pure Hyprland -- Super+Q closes it, Super+drag moves it,
# and Escape still works.
#
# What must hold:
#
#   1. No minimize or maximize control anywhere in the settings chrome.
#   2. The bar collapses to nothing rather than merely hiding, or the page
#      below keeps a 48px hole where the bar used to be.
#   3. The title and the close button swap sides together.
#   4. The close button is reachable and identifiable without a mouse or
#      sight: it is a "×" glyph and nothing else.
#   5. Escape closes the window whether or not the bar is drawn, so turning
#      the titlebar off never traps somebody in a window with no visible way
#      out.

set -euo pipefail

repo_dir="$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)"
shell_dir="$repo_dir/config/dot/quickshell"
shell_ui="$shell_dir/modules/settings/SettingsShell.qml"
window="$shell_dir/modules/settings/SettingsWindow.qml"
appearance="$shell_dir/modules/settings/AppearancePage.qml"
schema="$shell_dir/config/PreferenceSchema.qml"

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

for file in "$shell_ui" "$window" "$appearance" "$schema"; do
    [[ -f "$file" ]] || fail "missing ${file#"$repo_dir/"}"
done

# ── 1. Nothing that cannot work ─────────────────────────────────────────────
python3 - "$shell_ui" "$window" <<'PY' || fail 'the settings chrome offers a control Hyprland cannot honour'
import re
import sys

for path in sys.argv[1:]:
    text = open(path, encoding="utf-8").read()
    # Comments may say the words -- explaining why they are absent is the
    # point. Code may not.
    code = re.sub(r"//.*", "", text)
    for word in ("minimize", "minimise", "maximize", "maximise"):
        if re.search(word, code, re.I):
            raise SystemExit(f"{path.split('/')[-1]} still has a {word} control")
PY

# ── 2. Off means gone, not merely invisible ─────────────────────────────────
rg -Fq 'readonly property bool shown: DesktopPreferences.get("panamaTitlebar") !== false' "$shell_ui" \
    || fail 'the titlebar does not follow the panamaTitlebar preference'
rg -Fq 'height: shown ? 48 : 0' "$shell_ui" \
    || fail 'the titlebar hides without collapsing, leaving a hole above the page'
rg -Fq 'visible: shown' "$shell_ui" \
    || fail 'the hidden titlebar is still rendered'
# Everything below is anchored to the bar's bottom edge, so collapsing it is
# what actually reclaims the space.
[[ "$(rg -c 'anchors.top: titlebar.bottom' "$shell_ui")" -ge 3 ]] \
    || fail 'the sidebar, tab strip and page no longer follow the titlebar edge'

# ── 3. Title and close button swap together ─────────────────────────────────
rg -Fq 'readonly property bool buttonsLeft: DesktopPreferences.get("titlebarButtonSide") === "left"' "$shell_ui" \
    || fail 'the titlebar does not follow the button-side preference'
python3 - "$shell_ui" <<'PY' || fail 'the titlebar is not side-aware'
import re
import sys

text = open(sys.argv[1], encoding="utf-8").read()
pairs = re.findall(r'anchors\.(left|right): titlebar\.buttonsLeft \? (\S+) : (\S+)', text)
if len(pairs) < 4:
    raise SystemExit("fewer than two side-aware elements; the title or the button is pinned")
# For each element, exactly one edge is released and the other taken, in both
# states -- binding both edges leaves the label squeezed into what is left.
for index in range(0, len(pairs), 2):
    first, second = pairs[index], pairs[index + 1]
    if first[0] == second[0]:
        raise SystemExit("a side-aware element anchors the same edge twice")
    if "undefined" not in (first[1] + first[2]) or "undefined" not in (second[1] + second[2]):
        raise SystemExit("a side-aware element never releases an anchor")
PY

# ── 4. The close button is reachable and identifiable ───────────────────────
python3 - "$shell_ui" <<'PY' || fail 'the close button is mouse-and-sight only'
import re
import sys

text = open(sys.argv[1], encoding="utf-8").read()
block = re.search(r'Rectangle \{\s*\n\s*id: closeButton(.*?)\n        \}\n', text, re.S)
if not block:
    raise SystemExit("there is no close button")
body = block.group(1)
for needle in (
    "activeFocusOnTab: true",
    "Accessible.role: Accessible.Button",
    'Accessible.name: "Close Settings"',
    "Keys.onReturnPressed: ShellState.closeSettings()",
    "Keys.onSpacePressed: ShellState.closeSettings()",
    "onClicked: ShellState.closeSettings()",
):
    if needle not in body:
        raise SystemExit(f"the close button is missing {needle}")
# A focused button that looks identical to an unfocused one is not keyboard
# operable in any useful sense.
if "activeFocus" not in body:
    raise SystemExit("the close button has no visible focus treatment")
PY

# It is the only button in the bar.
[[ "$(rg -c 'Accessible.role: Accessible.Button' "$shell_ui")" == "1" ]] \
    || fail 'the titlebar has grown a second button'

# ── 5. The window is still movable and still closable ───────────────────────
rg -Fq 'startSystemMove()' "$shell_ui" \
    || fail 'the titlebar cannot drag the window'
python3 - "$shell_ui" <<'PY' || fail 'Escape no longer closes the window'
import re
import sys

text = open(sys.argv[1], encoding="utf-8").read()
shortcut = re.search(r'Shortcut \{(.*?)\}', text, re.S)
if not shortcut or 'sequence: "Escape"' not in shortcut.group(1):
    raise SystemExit("there is no Escape shortcut")
if 'ShellState.closeSettings()' not in shortcut.group(1):
    raise SystemExit("Escape does not close settings")
# It is declared on the shell, not inside the titlebar, so hiding the bar
# cannot take it away.
if text.index("Shortcut {") < text.index("id: titlebar"):
    raise SystemExit("the Escape shortcut is declared before the shell content")
titlebar = re.search(r'Rectangle \{\s*\n\s*id: titlebar(.*?)\n    \}\n', text, re.S)
if titlebar and "Shortcut" in titlebar.group(1):
    raise SystemExit("Escape is scoped inside the titlebar, so hiding the bar removes it")
PY

# ── The preference exists and is reachable ──────────────────────────────────
python3 - "$schema" <<'PY' || fail 'the panamaTitlebar schema entry is missing or malformed'
import re
import sys

text = open(sys.argv[1], encoding="utf-8").read()
block = re.search(r"\{\s*\n\s*key:\s*\"panamaTitlebar\".*?\n\s{8}\}", text, re.S)
if not block:
    raise SystemExit("panamaTitlebar is not in the schema")
body = block.group(0)
for needle in ('type: "bool"', "def: true", 'group: "titlebar"'):
    if needle not in body:
        raise SystemExit(f"panamaTitlebar is missing {needle}")
if "internal: true" in body:
    raise SystemExit("panamaTitlebar is internal, so nobody can turn it off")
PY

rg -Fq 'setting: "panamaTitlebar"' "$appearance" \
    || fail 'Appearance does not expose the titlebar toggle'
rg -Fq 'Super+Q closes' "$schema" \
    || fail 'the toggle does not say what happens once the titlebar is gone'

printf 'settings titlebar contract: PASS\n'