"""Tests for agenda.generate_booking_yaml."""

from dataclasses import dataclass
from datetime import date
from pathlib import Path

import pytest
import yaml

from agenda import generate_booking_yaml


@dataclass
class FakeTrip:
    """Small stand-in for agenda.types.Trip in matching tests."""

    start: date
    end: date | None


def test_yaml_format_description_includes_train_spec() -> None:
    """Train prompt docs should come from personal-data-yaml.md."""
    description = generate_booking_yaml.yaml_format_description(
        generate_booking_yaml.BOOKING_CONFIGS["train"]
    )

    assert "## General Rules" in description
    assert "## Cross-File References" in description
    assert "## `trains.yaml`" in description
    assert "`operator`: booking/operator label" in description


def test_build_prompt_uses_spec_and_keeps_trip_exclusion() -> None:
    """The generated prompt should use the documented schema."""
    prompt = generate_booking_yaml.build_prompt(
        "Eurostar booking details",
        generate_booking_yaml.BOOKING_CONFIGS["train"],
        current_bookings="- operator: eurostar\n",
    )

    assert "Use this YAML format specification" in prompt
    assert "## `trains.yaml`" in prompt
    assert 'Exclude the top-level "trip" key' in prompt
    assert "Eurostar booking details" in prompt


def test_booking_text_from_args_fetches_url(monkeypatch: pytest.MonkeyPatch) -> None:
    """URL arguments should be fetched instead of reading stdin."""
    monkeypatch.setattr(
        generate_booking_yaml,
        "url_to_booking_text",
        lambda url: f"fetched {url}",
    )

    assert generate_booking_yaml.booking_text_from_args(["https://example.com"]) == (
        "fetched https://example.com"
    )


def test_matching_trip_date_uses_built_trip_end(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """Trip matching should use build_trip_list-derived end dates."""
    monkeypatch.setattr(
        generate_booking_yaml,
        "build_trips",
        lambda data_dir: [  # noqa: ARG005
            FakeTrip(date(2026, 2, 6), date(2026, 2, 9)),
            FakeTrip(date(2026, 3, 3), date(2026, 3, 5)),
        ],
    )

    assert generate_booking_yaml.matching_trip_date(
        generate_booking_yaml.datetime_from_yaml_value("2026-02-08 12:00:00+01:00"),
        Path("/tmp/personal-data"),
    ) == date(2026, 2, 6)


def test_matching_trip_date_falls_back_to_departure_date(
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """A booking outside known trips should use its first departure date."""
    monkeypatch.setattr(
        generate_booking_yaml, "build_trips", lambda data_dir: []  # noqa: ARG005
    )

    assert generate_booking_yaml.matching_trip_date(
        generate_booking_yaml.datetime_from_yaml_value("2026-04-10 12:00:00+01:00"),
        Path("/tmp/personal-data"),
    ) == date(2026, 4, 10)


def test_import_train_booking_adds_trip_and_inserts_chronologically(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """Generated train bookings should be written into trains.yaml in order."""
    (tmp_path / "trains.yaml").write_text("""- operator: early
  from: A
  to: B
  trip: 2026-02-01
  depart: 2026-02-01 10:00:00+00:00
  arrive: 2026-02-01 11:00:00+00:00
  legs: []

- operator: late
  from: C
  to: D
  trip: 2026-02-10
  depart: 2026-02-10 10:00:00+00:00
  arrive: 2026-02-10 11:00:00+00:00
  legs: []
""")
    monkeypatch.setattr(
        generate_booking_yaml,
        "matching_trip_date",
        lambda depart, data_dir: date(2026, 2, 6),
    )

    count = generate_booking_yaml.import_booking_yaml(
        """- operator: eurostar
  from: London St Pancras
  to: Brussels Midi
  depart: 2026-02-06 15:04:00+00:00
  arrive: 2026-02-06 18:12:00+01:00
  legs: []
""",
        generate_booking_yaml.BOOKING_CONFIGS["train"],
        data_dir=tmp_path,
    )

    written = yaml.safe_load((tmp_path / "trains.yaml").read_text())
    assert count == 1
    assert [item["operator"] for item in written] == ["early", "eurostar", "late"]
    assert written[1]["trip"] == date(2026, 2, 6)
    assert list(written[1]).index("trip") == 3
    assert "\n\n- operator: eurostar\n" in (tmp_path / "trains.yaml").read_text()


def test_import_flight_booking_adds_trip_and_inserts_chronologically(
    tmp_path: Path,
    monkeypatch: pytest.MonkeyPatch,
) -> None:
    """Generated flight bookings should be written into flights.yaml in order."""
    (tmp_path / "flights.yaml").write_text("""---
- booking_reference: OLD
  trip: 2026-02-01
  flights:
   - depart: 2026-02-01 10:00:00+00:00
     from: BRS
     to: AMS
     flight_number: '1'
     airline: U2

- booking_reference: NEWER
  trip: 2026-02-10
  flights:
   - depart: 2026-02-10 10:00:00+00:00
     from: BRS
     to: AMS
     flight_number: '2'
     airline: U2
""")
    monkeypatch.setattr(
        generate_booking_yaml,
        "matching_trip_date",
        lambda depart, data_dir: date(2026, 2, 6),
    )

    count = generate_booking_yaml.import_booking_yaml(
        """booking_reference: MID
flights:
  - depart: 2026-02-06 10:00:00+00:00
    from: BRS
    to: AMS
    flight_number: '3'
    airline: U2
""",
        generate_booking_yaml.BOOKING_CONFIGS["flight"],
        data_dir=tmp_path,
    )

    written = yaml.safe_load((tmp_path / "flights.yaml").read_text())
    assert count == 1
    assert [item["booking_reference"] for item in written] == ["OLD", "MID", "NEWER"]
    assert written[1]["trip"] == date(2026, 2, 6)
    assert list(written[1]).index("trip") == 1