"""Tests for osm-pt-geojson."""
import json
from pathlib import Path

import pytest
import responses as responses_lib
from click.testing import CliRunner

from osm_geojson.pt import core
from osm_geojson.pt.cli import cli, output_geojson
from osm_geojson.pt.core import OsmError

FIXTURES = Path(__file__).parent / "fixtures"
FULL_URL = "https://www.openstreetmap.org/api/0.6/relation/15083963/full.json"
RELATION_ID = 15083963


@pytest.fixture()
def full_data() -> dict:
    """Load the saved full API response for relation 15083963 (M11 Istanbul Metro)."""
    return json.loads((FIXTURES / "15083963-full.json").read_text())


@pytest.fixture()
def parsed(full_data: dict) -> tuple:
    """Return parsed elements (nodes, ways, stop_ids, way_ids, tags) for relation 15083963."""
    return core.parse_elements(full_data, RELATION_ID)


# ---------------------------------------------------------------------------
# parse_elements
# ---------------------------------------------------------------------------

def test_parse_elements_stop_count(parsed: tuple) -> None:
    """All ten stops on the M11 are extracted in order."""
    nodes, ways, stop_ids, way_ids, tags = parsed
    assert len(stop_ids) == 10


def test_parse_elements_first_and_last_stop(parsed: tuple) -> None:
    """The first and last stops match the route terminus names."""
    nodes, ways, stop_ids, way_ids, tags = parsed
    assert core.node_name(nodes[stop_ids[0]]) == "Arnavutköy Hastane"
    assert core.node_name(nodes[stop_ids[-1]]) == "Gayrettepe"


def test_parse_elements_way_count(parsed: tuple) -> None:
    """All ten member ways are extracted."""
    nodes, ways, stop_ids, way_ids, tags = parsed
    assert len(way_ids) == 10


def test_parse_elements_tags(parsed: tuple) -> None:
    """Route tags are returned correctly."""
    _, _, _, _, tags = parsed
    assert tags["ref"] == "M11"
    assert tags["route"] == "subway"


def test_parse_elements_unknown_relation(full_data: dict) -> None:
    """Requesting a relation ID not present in the response raises OsmError."""
    with pytest.raises(OsmError):
        core.parse_elements(full_data, 9999999)


# ---------------------------------------------------------------------------
# build_route_coords
# ---------------------------------------------------------------------------

def test_build_route_coords_returns_coords(parsed: tuple) -> None:
    """Chained coordinates are non-empty and fall within the Istanbul bounding box."""
    nodes, ways, stop_ids, way_ids, tags = parsed
    coords = core.build_route_coords(way_ids, ways, nodes)
    assert len(coords) > 0
    for coord in coords:
        assert len(coord) == 2
        lon, lat = coord
        assert 28.0 < lon < 29.1
        assert 40.0 < lat < 42.0


def test_build_route_coords_empty_ways() -> None:
    """An empty way list returns an empty coordinate list."""
    assert core.build_route_coords([], {}, {}) == []


# ---------------------------------------------------------------------------
# nearest_coord_index
# ---------------------------------------------------------------------------

def test_nearest_coord_index_exact() -> None:
    """Returns the index of an exact coordinate match."""
    coords = [[1.0, 2.0], [3.0, 4.0], [5.0, 6.0]]
    assert core.nearest_coord_index(3.0, 4.0, coords) == 1


def test_nearest_coord_index_approximate() -> None:
    """Returns the index of the closest coordinate when there is no exact match."""
    coords = [[0.0, 0.0], [10.0, 0.0], [20.0, 0.0]]
    assert core.nearest_coord_index(9.0, 0.0, coords) == 1


# ---------------------------------------------------------------------------
# node_name
# ---------------------------------------------------------------------------

def test_node_name_uses_name_tag() -> None:
    """Prefers the name tag when present."""
    node = {"id": 1, "lat": 0.0, "lon": 0.0, "tags": {"name": "Central", "ref": "C1"}}
    assert core.node_name(node) == "Central"


def test_node_name_falls_back_to_ref() -> None:
    """Falls back to the ref tag when there is no name tag."""
    node = {"id": 1, "lat": 0.0, "lon": 0.0, "tags": {"ref": "C1"}}
    assert core.node_name(node) == "C1"


def test_node_name_falls_back_to_id() -> None:
    """Falls back to the node ID when tags are present but empty."""
    node = {"id": 42, "lat": 0.0, "lon": 0.0, "tags": {}}
    assert core.node_name(node) == "42"


def test_node_name_no_tags() -> None:
    """Falls back to the node ID when the tags key is absent."""
    node = {"id": 99, "lat": 0.0, "lon": 0.0}
    assert core.node_name(node) == "99"


# ---------------------------------------------------------------------------
# make_geojson
# ---------------------------------------------------------------------------

def test_make_geojson_full(parsed: tuple) -> None:
    """Full output contains one LineString and one Point per stop."""
    nodes, ways, stop_ids, way_ids, tags = parsed
    coords = core.build_route_coords(way_ids, ways, nodes)
    geojson = core.make_geojson(coords, stop_ids, nodes, tags)

    assert geojson["type"] == "FeatureCollection"
    features = geojson["features"]
    line_features = [f for f in features if f["geometry"]["type"] == "LineString"]
    point_features = [f for f in features if f["geometry"]["type"] == "Point"]

    assert len(line_features) == 1
    assert len(point_features) == 10


def test_make_geojson_no_stops(parsed: tuple) -> None:
    """With no_stops=True, only the LineString feature is included."""
    nodes, ways, stop_ids, way_ids, tags = parsed
    coords = core.build_route_coords(way_ids, ways, nodes)
    geojson = core.make_geojson(coords, stop_ids, nodes, tags, no_stops=True)

    features = geojson["features"]
    assert all(f["geometry"]["type"] == "LineString" for f in features)


def test_make_geojson_slice(parsed: tuple) -> None:
    """Slicing by coord index produces a shorter LineString with the correct length."""
    nodes, ways, stop_ids, way_ids, tags = parsed
    coords = core.build_route_coords(way_ids, ways, nodes)
    full = core.make_geojson(coords, stop_ids, nodes, tags)
    full_line_len = len(full["features"][0]["geometry"]["coordinates"])

    sliced = core.make_geojson(coords, stop_ids, nodes, tags, idx_from=10, idx_to=50)
    sliced_line_len = len(sliced["features"][0]["geometry"]["coordinates"])

    assert sliced_line_len == 41  # 50 - 10 + 1
    assert sliced_line_len < full_line_len


def test_make_geojson_linestring_properties(parsed: tuple) -> None:
    """The LineString feature carries route properties from the OSM relation tags."""
    nodes, ways, stop_ids, way_ids, tags = parsed
    coords = core.build_route_coords(way_ids, ways, nodes)
    geojson = core.make_geojson(coords, stop_ids, nodes, tags)

    props = geojson["features"][0]["properties"]
    assert props["ref"] == "M11"
    assert props["route"] == "subway"


# ---------------------------------------------------------------------------
# CLI — list-stations
# ---------------------------------------------------------------------------

@responses_lib.activate
def test_cli_list_stations(full_data: dict) -> None:
    """list-stations prints the route name and all stop names."""
    responses_lib.add(responses_lib.GET, FULL_URL, json=full_data)
    runner = CliRunner()
    result = runner.invoke(cli, ["list-stations", str(RELATION_ID)])
    assert result.exit_code == 0
    assert "M11" in result.output
    assert "Arnavutköy Hastane" in result.output
    assert "Gayrettepe" in result.output


@responses_lib.activate
def test_cli_list_stations_http_error() -> None:
    """list-stations exits with code 1 on an HTTP error response."""
    responses_lib.add(responses_lib.GET, FULL_URL, status=503)
    runner = CliRunner()
    result = runner.invoke(cli, ["list-stations", str(RELATION_ID)])
    assert result.exit_code == 1


# ---------------------------------------------------------------------------
# CLI — full-route
# ---------------------------------------------------------------------------

@responses_lib.activate
def test_cli_full_route_geojson(full_data: dict) -> None:
    """full-route outputs a valid GeoJSON FeatureCollection to stdout."""
    responses_lib.add(responses_lib.GET, FULL_URL, json=full_data)
    runner = CliRunner()
    result = runner.invoke(cli, ["full-route", str(RELATION_ID)])
    assert result.exit_code == 0
    geojson = json.loads(result.output)
    assert geojson["type"] == "FeatureCollection"


@responses_lib.activate
def test_cli_full_route_no_stops(full_data: dict) -> None:
    """full-route --no-stops omits Point features from the output."""
    responses_lib.add(responses_lib.GET, FULL_URL, json=full_data)
    runner = CliRunner()
    result = runner.invoke(cli, ["full-route", str(RELATION_ID), "--no-stops"])
    assert result.exit_code == 0
    geojson = json.loads(result.output)
    types = [f["geometry"]["type"] for f in geojson["features"]]
    assert "Point" not in types


@responses_lib.activate
def test_cli_full_route_output_file(full_data: dict, tmp_path) -> None:
    """full-route -o writes valid GeoJSON to the specified file."""
    responses_lib.add(responses_lib.GET, FULL_URL, json=full_data)
    out = tmp_path / "route.geojson"
    runner = CliRunner()
    result = runner.invoke(cli, ["full-route", str(RELATION_ID), "-o", str(out)])
    assert result.exit_code == 0
    assert out.exists()
    geojson = json.loads(out.read_text())
    assert geojson["type"] == "FeatureCollection"


# ---------------------------------------------------------------------------
# CLI — route-between
# ---------------------------------------------------------------------------

@responses_lib.activate
def test_cli_route_between(full_data: dict) -> None:
    """route-between includes both endpoint stops in the output."""
    responses_lib.add(responses_lib.GET, FULL_URL, json=full_data)
    runner = CliRunner()
    result = runner.invoke(
        cli,
        ["route-between", str(RELATION_ID), "Arnavutköy Hastane", "Gayrettepe"],
    )
    assert result.exit_code == 0
    geojson = json.loads(result.output)
    stop_names = [
        f["properties"]["name"]
        for f in geojson["features"]
        if f["geometry"]["type"] == "Point"
    ]
    assert "Arnavutköy Hastane" in stop_names
    assert "Gayrettepe" in stop_names


@responses_lib.activate
def test_cli_route_between_unknown_station(full_data: dict) -> None:
    """route-between exits with code 1 when a station name is not found."""
    responses_lib.add(responses_lib.GET, FULL_URL, json=full_data)
    runner = CliRunner()
    result = runner.invoke(
        cli,
        ["route-between", str(RELATION_ID), "Nonexistent", "Gayrettepe"],
    )
    assert result.exit_code == 1


@responses_lib.activate
def test_cli_route_between_stops_subset(full_data: dict) -> None:
    """route-between only includes stops between the two named stations."""
    responses_lib.add(responses_lib.GET, FULL_URL, json=full_data)
    runner = CliRunner()
    result = runner.invoke(
        cli,
        ["route-between", str(RELATION_ID), "İstanbul Havalimanı", "Hasdal"],
    )
    assert result.exit_code == 0
    geojson = json.loads(result.output)
    stop_names = [
        f["properties"]["name"]
        for f in geojson["features"]
        if f["geometry"]["type"] == "Point"
    ]
    assert "İstanbul Havalimanı" in stop_names
    assert "Hasdal" in stop_names
    assert "Arnavutköy Hastane" not in stop_names
    assert "Gayrettepe" not in stop_names