import json
import subprocess
from pathlib import Path


LATER_PICKER = Path(__file__).parents[1] / "frontend" / "later-picker.js"


def run_node(script: str) -> dict:
    result = subprocess.run(
        ["node", "-e", script], check=True, capture_output=True, text=True
    )
    return json.loads(result.stdout)


def test_exact_local_time_is_validated_and_converted_to_an_instant():
    script = f"""
const createLaterPicker = require({json.dumps(str(LATER_PICKER))});
const picker = createLaterPicker({{
  now: () => new Date(2026, 7, 9, 14, 0, 0),
}});
const valid = picker.parse('2026-08-09T16:30');
const past = picker.parse('2026-08-09T13:59');
const invalid = picker.parse('2026-02-30T12:00');
process.stdout.write(JSON.stringify({{
  valid: {{ok:valid.ok, local:[valid.value.getFullYear(), valid.value.getMonth() + 1, valid.value.getDate(), valid.value.getHours(), valid.value.getMinutes()]}},
  past, invalid,
}}));
"""
    output = run_node(script)

    assert output["valid"] == {"ok": True, "local": [2026, 8, 9, 16, 30]}
    assert output["past"] == {
        "ok": False,
        "message": "Choose a future date and time.",
    }
    assert output["invalid"] == {
        "ok": False,
        "message": "Choose a valid local date and time.",
    }


def test_picker_uses_history_for_cancel_and_confirms_only_valid_future_time():
    script = f"""
const createLaterPicker = require({json.dumps(str(LATER_PICKER))});
const listeners = {{}};
const states = [];
const confirmed = [];
let focused = 0;
const history = {{
  state: {{workRoute:'issue'}},
  pushState(state) {{ this.state = state; states.push(['push', state.laterPicker]); }},
  back() {{ states.push(['back']); const previous = {{workRoute:'issue'}}; this.state = previous; listeners.popstate({{state:previous}}); }},
}};
const picker = createLaterPicker({{
  now: () => new Date(2026, 7, 9, 14, 0, 0), history,
  eventTarget: {{addEventListener:(name, callback) => {{ listeners[name] = callback; }}}},
  onState: state => states.push([state.open, state.message || '']),
  onConfirm: (item, value, context) => {{ confirmed.push([item.number, value.toISOString(), context]); return true; }},
}});
picker.start();
picker.open({{number:17}}, {{focus:() => {{ focused += 1; }}}}, 'detail');
const invalid = picker.submit('2026-08-09T13:00');
const valid = picker.submit('2026-08-09T16:30');
picker.submit('2026-08-09T17:30');
process.stdout.write(JSON.stringify({{invalid, valid, confirmed, focused, current:picker.current(), states}}));
"""
    output = run_node(script)

    assert output["invalid"] is False
    assert output["valid"] is True
    assert output["confirmed"] == [[17, "2026-08-09T16:30:00.000Z", "detail"]]
    assert output["focused"] == 1
    assert output["current"] is False
    assert [False, "Choose a future date and time."] not in output["states"]
    assert [True, "Choose a future date and time."] in output["states"]
    assert ["back"] in output["states"]


def test_picker_runs_detail_cleanup_only_after_its_history_entry_closes():
    script = f"""
const createLaterPicker = require({json.dumps(str(LATER_PICKER))});
const listeners = {{}};
const order = [];
const history = {{
  state: {{workRoute:'issue'}},
  pushState(state) {{ this.state = state; }},
  back() {{
    order.push('picker-back');
    this.state = {{workRoute:'issue'}};
    listeners.popstate({{state:this.state}});
  }},
}};
const picker = createLaterPicker({{
  now:() => new Date(2026, 7, 9, 14, 0), history,
  eventTarget:{{addEventListener:(name, callback) => {{ listeners[name] = callback; }}}},
  onConfirm:() => () => order.push('detail-close'),
}});
picker.start();
picker.open({{number:17}}, null, 'detail');
const saved = picker.submit('2026-08-09T16:30');
process.stdout.write(JSON.stringify({{saved, order}}));
"""
    output = run_node(script)

    assert output == {"saved": True, "order": ["picker-back", "detail-close"]}


def test_picker_ignores_a_second_submit_while_browser_back_is_pending():
    script = f"""
const createLaterPicker = require({json.dumps(str(LATER_PICKER))});
const listeners = {{}};
let popstate;
let confirmations = 0;
const history = {{
  state:null,
  pushState(state) {{ this.state = state; }},
  back() {{ popstate = () => {{ this.state = {{}}; listeners.popstate({{state:this.state}}); }}; }},
}};
const picker = createLaterPicker({{
  now:() => new Date(2026, 7, 9, 14, 0), history,
  eventTarget:{{addEventListener:(name, callback) => {{ listeners[name] = callback; }}}},
  onConfirm:() => {{ confirmations += 1; return true; }},
}});
picker.start();
picker.open({{number:17}});
const first = picker.submit('2026-08-09T16:30');
const second = picker.submit('2026-08-09T16:30');
popstate();
process.stdout.write(JSON.stringify({{first, second, confirmations}}));
"""
    output = run_node(script)

    assert output == {"first": True, "second": False, "confirmations": 1}