#!/bin/bash
# Which applications a device offers, and the bar that comes out of it.
#
# Two halves. The first is the decision — one setting per application, and
# never the shape of the machine. The second actually RUNS the layout
# script the package ships, in node, with Plasma's API stubbed, so the
# assertions are about the real file rather than about a copy of its text
# that could drift away from it.
set -uo pipefail

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

PYTHONPATH="$ROOT/lib" python3 - "$ROOT" <<'PY'
import importlib.util
import json
import os
import shutil
import subprocess
import sys
import tempfile
from importlib.machinery import SourceFileLoader
from pathlib import Path

root = Path(sys.argv[1])
loader = SourceFileLoader("layout", str(root / "scripts/classroom-desktop-layout"))
spec = importlib.util.spec_from_loader("layout", loader)
module = importlib.util.module_from_spec(spec)
loader.exec_module(module)

LAYOUT = root / "config/plasma/lookandfeel/contents/layouts/org.kde.plasma.desktop-layout.js"

passed = failed = 0


def check(label, condition, detail=""):
    global passed, failed
    if condition:
        print(f"  ok   {label}")
        passed += 1
    else:
        print(f"  FAIL {label}")
        if detail:
            print(f"       {detail}")
        failed += 1


BLOCK = """/* CLASSROOM-FEATURES-BEGIN */
var WONDERINK = true;
var DVD = true;
var PARENT_CALL = true;
/* CLASSROOM-FEATURES-END */"""


print("1. one line per application, rewritten in place")
check("a feature can be switched off",
      "var WONDERINK = false;" in module.rewrite(BLOCK, "WONDERINK", False))
check("and back on again",
      "var WONDERINK = true;"
      in module.rewrite(module.rewrite(BLOCK, "WONDERINK", False),
                        "WONDERINK", True))
check("switching one leaves the others alone",
      "var DVD = true;" in module.rewrite(BLOCK, "WONDERINK", False)
      and "var PARENT_CALL = true;" in module.rewrite(BLOCK, "WONDERINK", False))
check("rewriting twice changes nothing the second time",
      module.rewrite(module.rewrite(BLOCK, "DVD", False), "DVD", False)
      == module.rewrite(BLOCK, "DVD", False))


print("2. the shape of the machine never decides what it is for")
# This is the architecture rule, and it is the one worth a test: a laptop
# must be able to run children's church and a tower must be able to be a
# Bible study.
module.has_optical_drive = lambda: True

laptop_with_ink = module.wanted({"DEVICE_TYPE": "laptop"})
check("a laptop still offers Wonder Ink unless told otherwise",
      laptop_with_ink["WONDERINK"] is True, str(laptop_with_ink))
check("a laptop still offers Parent Call unless told otherwise",
      laptop_with_ink["PARENT_CALL"] is True)

desktop_no_ink = module.wanted(
    {"DEVICE_TYPE": "desktop", "WONDERINK_ENABLED": "false"})
check("a desktop can have Wonder Ink taken away",
      desktop_no_ink["WONDERINK"] is False)
check("and keeps everything else",
      desktop_no_ink["DVD"] is True and desktop_no_ink["PARENT_CALL"] is True)

unset = module.wanted({})
check("an existing room that has never heard of these keeps all three",
      unset["WONDERINK"] and unset["DVD"] and unset["PARENT_CALL"],
      str(unset))
# The one that must NOT follow that rule. Every existing classroom has
# Wonder Ink, a drive and Parent Call, so an upgrade has to leave all
# three on. No existing classroom has Presentations, so an upgrade has to
# leave it off — a new button on a bar nobody asked for is a support call.
check("but Presentations is off until a device asks for it",
      unset["PRESENTATIONS"] is False, str(unset))


print("3. a drive can only ever take the player away")
module.has_optical_drive = lambda: False
check("no drive means no player, whatever the setting says",
      module.wanted({"DVD_ENABLED": "true"})["DVD"] is False)
module.has_optical_drive = lambda: True
check("a drive plus DVD_ENABLED=false is still no player",
      module.wanted({"DVD_ENABLED": "false"})["DVD"] is False)
check("a drive plus DVD_ENABLED=true is the player",
      module.wanted({"DVD_ENABLED": "true"})["DVD"] is True)


print("4. the script rewrites the layout the package actually ships")
module.has_optical_drive = lambda: True

def run(config):
    """Run the real script over a copy of the real layout."""
    work = Path(tempfile.mkdtemp(prefix="classroom-layout-"))
    copy = work / "layout.js"
    shutil.copy(LAYOUT, copy)

    module.read_device_config = lambda: config
    module.main.__globals__["sys"].argv = ["classroom-desktop-layout", str(copy)]
    module.main()

    return copy.read_text(), work

text, work = run({})
check("the shipped layout carries the feature block",
      module.MARKER in text)
check("and an unconfigured machine keeps every application",
      "var WONDERINK = true;" in text and "var DVD = true;" in text
      and "var PARENT_CALL = true;" in text)


print("5. the bar that comes out, evaluated in node")
STUB = r"""
const fs = require("fs");
const captured = {widgets: [], config: {}, launchers: []};
let current = null;
function makeWidget(type) {
    const w = {
        type: type,
        currentConfigGroup: [],
        writeConfig: function (k, v) {
            captured.config[type + "." + k] = String(v);
            // Quick Launch widgets share a config key, so the last one
            // written would otherwise be the only one anybody could see.
            if (k === "launcherUrls") { captured.launchers.push(String(v)); }
        },
        reloadConfig: function () {}
    };
    captured.widgets.push(type);
    return w;
}
globalThis.desktops = () => [makeWidget("desktop")];
globalThis.Panel = function () {
    this.addWidget = makeWidget;
    return this;
};
eval(fs.readFileSync(process.argv[2], "utf8"));
console.log(JSON.stringify(captured));
"""

def bar(config):
    text, work = run(config)
    stub = work / "stub.js"
    stub.write_text(STUB)
    result = subprocess.run(
        ["node", str(stub), str(work / "layout.js")],
        capture_output=True, text=True, timeout=60,
    )
    if result.returncode != 0:
        return None, result.stderr
    return json.loads(result.stdout), ""


if shutil.which("node") is None:
    print("  SKIP node is not installed; the layout was not evaluated")
else:
    LAUNCH = "org.kde.plasma.icontasks.launchers"
    INK = "applications:ekklesia-wonderink.desktop"
    WEB = "applications:google-chrome.desktop"
    DISC = "applications:ekklesia-dvd.desktop"

    every, why = bar({})
    check("a classroom gets Wonder Ink, the browser and the player, in order",
          every and every["config"].get(LAUNCH) == f"{INK},{WEB},{DISC}",
          (every or {}).get("config", {}).get(LAUNCH, why))
    CALL = "file:///usr/share/applications/ekklesia-parent-call.desktop"
    HELP = "file:///usr/share/applications/ekklesia-manual.desktop"

    check("and Parent Call in the corner",
          every and CALL in every["launchers"],
          str((every or {}).get("launchers")))
    check("and the unfinished Help launcher is hidden",
          every and HELP not in every["launchers"],
          str((every or {}).get("launchers")))

    no_ink, why = bar({"WONDERINK_ENABLED": "false"})
    check("a Bible study desktop has the browser first and no gap",
          no_ink and no_ink["config"].get(LAUNCH) == f"{WEB},{DISC}",
          (no_ink or {}).get("config", {}).get(LAUNCH, why))

    module.has_optical_drive = lambda: False
    bible, why = bar({"WONDERINK_ENABLED": "false",
                      "PARENT_CALL_ENABLED": "false",
                      "DEVICE_TYPE": "laptop"})
    check("the laptop's bar is the browser alone",
          bible and bible["config"].get(LAUNCH) == WEB,
          (bible or {}).get("config", {}).get(LAUNCH, why))
    check("with no Parent Call button on it",
          bible and CALL not in bible["launchers"],
          str((bible or {}).get("launchers")))
    # The source and launcher remain installed, but the unfinished digital
    # Help entry point is deliberately absent from the teacher-facing bar.
    check("and unfinished Help stays hidden",
          bible and HELP not in bible["launchers"],
          str((bible or {}).get("launchers")))
    SLIDES = "applications:ekklesia-presentations.desktop"

    # THE DOCK ORDER IS THE THING NOT TO BREAK.
    #
    # Every existing room has Wonder Ink, the browser and the player in
    # that order, and teachers have been pressing them in that order for
    # months. Presentations is appended, so all three keep their place on
    # every machine that upgrades into this release.
    module.has_optical_drive = lambda: True
    slides, why = bar({"PRESENTATIONS_ENABLED": "true"})
    check("Presentations goes on the END of the row, after the player",
          slides and slides["config"].get(LAUNCH)
          == f"{INK},{WEB},{DISC},{SLIDES}",
          (slides or {}).get("config", {}).get(LAUNCH, why))

    without, why = bar({"PRESENTATIONS_ENABLED": "false"})
    check("and is absent entirely when the device does not offer it",
          without and SLIDES not in without["config"].get(LAUNCH, ""),
          (without or {}).get("config", {}).get(LAUNCH, why))
    check("which leaves the other three exactly where they were",
          without and without["config"].get(LAUNCH) == f"{INK},{WEB},{DISC}",
          (without or {}).get("config", {}).get(LAUNCH, why))

    # The prayer-room laptop: the browser and Presentations, nothing else.
    module.has_optical_drive = lambda: False
    study, why = bar({"PRESENTATIONS_ENABLED": "true",
                      "WONDERINK_ENABLED": "false",
                      "PARENT_CALL_ENABLED": "false",
                      "DEVICE_TYPE": "laptop"})
    check("the Bible study laptop gets the browser and Presentations",
          study and study["config"].get(LAUNCH) == f"{WEB},{SLIDES}",
          (study or {}).get("config", {}).get(LAUNCH, why))
    check("and still no Parent Call on it",
          study and CALL not in study["launchers"],
          str((study or {}).get("launchers")))

    check("and the status corner is untouched",
          bible and "org.kde.plasma.volume" in bible["widgets"]
          and "org.kde.plasma.digitalclock" in bible["widgets"]
          and "org.kde.plasma.networkmanagement" in bible["widgets"])

    module.has_optical_drive = lambda: True
    ink_laptop, why = bar({"DEVICE_TYPE": "laptop"})
    check("a laptop taking children's church gets the same bar as a tower",
          ink_laptop and ink_laptop["config"].get(LAUNCH) == f"{INK},{WEB},{DISC}",
          (ink_laptop or {}).get("config", {}).get(LAUNCH, why))

    print("6. the order survives an application opening")
    # 1, "manually", is the ONLY value at which the Icons-Only Task
    # Manager keeps a running application in its pinned position:
    # main.qml gates launchInPlace on sortingStrategy === 1, and for an
    # icons-only bar the launcher is always hidden once its application
    # starts. 0.2.4 set this to 0 and the browser jumped behind the disc
    # player the moment it opened.
    #
    # This assertion is the mechanism. The behaviour itself is checked
    # against real windows by tools/lab/order-check, because a
    # configuration test is exactly what 0.2.4 passed.
    check("sorting is manual, which is what keeps a launcher in place",
          every and every["config"].get(
              "org.kde.plasma.icontasks.sortingStrategy") == "1",
          str((every or {}).get("config", {}).get(
              "org.kde.plasma.icontasks.sortingStrategy")))
    check("and launchers stay ahead of running windows",
          every and every["config"].get(
              "org.kde.plasma.icontasks.separateLaunchers") == "true")

print("7. a disabled application does not start either")
# Taking the launcher off the bar is half of it. The command itself has
# to refuse, so a device that does not offer an application cannot be
# talked into running it by a stale desktop entry or a technician's
# muscle memory.
for script, setting in (("classroom-wonderink", "WONDERINK_ENABLED"),
                        ("classroom-parent-call", "PARENT_CALL_ENABLED"),
                        ("classroom-presentations", "PRESENTATIONS_ENABLED"),
                        ("classroom-presentation-import",
                         "PRESENTATIONS_ENABLED")):
    text = (root / "scripts" / script).read_text()
    check(f"{script} refuses when {setting} is false",
          setting in text and "not starting" in text)
    check(f"{script} asks the shared helper rather than reading the file",
          "feature(" in text and "read_device_config()" in text)

# And each of them defaults the way its own room needs, which is not the
# same answer for all four. Asserting one rule for all of them would pass
# for the wrong reason on the one that differs.
from classroom_config import feature as _feature  # noqa: E402

for setting, default, why in (
        ("WONDERINK_ENABLED", True, "every existing classroom has it"),
        ("DVD_ENABLED", True, "every existing classroom has it"),
        ("PARENT_CALL_ENABLED", True, "every existing classroom has it"),
        ("PRESENTATIONS_ENABLED", False, "no existing classroom has it")):
    check(f"{setting} defaults to {default} — {why}",
          _feature({}, setting) is default)

print()
print(f"{passed} passed, {failed} failed")
raise SystemExit(1 if failed else 0)
PY