#!/bin/bash
set -euo pipefail
ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
ROOT="$ROOT" PYTHONPATH="$ROOT/lib" python3 - <<'PY'
import os, pathlib, runpy, subprocess, sys, tempfile
from classroom_config import ui_scale
root = pathlib.Path(os.environ['ROOT'])
helper = runpy.run_path(str(root/'scripts/classroom-set-scale'))
original = '# keep this\nCHANNEL=classroom-v2\nMQTT_PASSWORD=literal $ and = characters\nUI_SCALE=1.25\nCUSTOM=x\nUI_SCALE=1.5\n'
result = helper['updated'](original, 2.0)
assert 'MQTT_PASSWORD=literal $ and = characters\n' in result
assert result.count('UI_SCALE=') == 1
assert helper['updated'](result, 2.0) == result
assert 'CUSTOM=x\n' in result
assert ui_scale({'UI_SCALE': '2'}) == 2
assert ui_scale({'UI_SCALE': '3'}) == 3
for bad in ('nan', 'inf', '-inf', 'oops'):
    assert ui_scale({'UI_SCALE': bad}) == 1
assert ui_scale({'UI_SCALE': '999'}) == 3
assert ui_scale({'UI_SCALE': '-1'}) == 0.8
# Run the actual migration's config code in a temporary directory: no services.
script = (root/'scripts/classroom-migrate').read_text()
code = script.split("<<'PY'\n", 1)[1].split('\nPY\n', 1)[0]
with tempfile.TemporaryDirectory() as tmp:
    path = pathlib.Path(tmp)/'device.conf'
    for channel in ('stable', 'canary', 'hyprland', 'classroom-v2', 'custom'):
        path.write_text(original.replace('CHANNEL=classroom-v2', 'CHANNEL='+channel))
        subprocess.run([sys.executable, '-c', code, str(path)], check=True, capture_output=True)
        # The experiment's channel and hyprland come home to stable;
        # everything anybody chose deliberately is left alone.
        expected = 'stable' if channel in ('classroom-v2', 'hyprland') else channel
        assert 'CHANNEL='+expected+'\n' in path.read_text()
        assert 'MQTT_PASSWORD=literal $ and = characters\n' in path.read_text()
print('Display settings: scale bounds, config preservation, idempotence and channel migration passed.')
PY