"""AZ-838 ``SatelliteProviderRouteClient`` unit tests (Epic AZ-835 C2).

Covers AC-1..AC-9 of
``_docs/02_tasks/todo/AZ-838_satellite_provider_route_client.md``:

* AC-1 wire shape — ``id`` / ``name`` / ``regionSizeMeters`` /
  ``zoomLevel`` / ``points[].lat`` / ``points[].lon`` /
  ``requestMaps`` / ``createTilesZip``.
* AC-2 polling — happy path + budget exhaustion.
* AC-3 4xx + RFC 7807 ProblemDetails → ``RouteValidationError``.
* AC-4 5xx / network / timeout → ``RouteTransientError``.
* AC-5 terminal failure → ``RouteTerminalFailureError``.
* AC-6 pre-emptive validation — every per-field rule mirrored from
  ``CreateRouteRequestValidator.cs`` (the spec's ``points <= 100`` /
  ``zoomLevel in 15..18`` were narrower than the actual server
  validator; the client tracks the SERVER bounds so it doesn't
  reject inputs the server would accept — see status-summary note
  in batch 107 cycle 3 report).
* AC-7 dry-run / ``build_planned_payload`` — assembles body + sha256
  without HTTP.

Tests use :class:`httpx.MockTransport` for deterministic HTTP, list-
backed log handlers for log capture, and a fake ``sleep`` so the
poll loop runs in O(0) wall time. The integration test (AC-10) is
gated on ``RUN_E2E=1`` and lives outside this file.
"""

from __future__ import annotations

import json
import logging
import math
import uuid
from pathlib import Path

import httpx
import pytest

from gps_denied_onboard.components.c11_tile_manager.errors import (
    RouteTerminalFailureError,
    RouteTransientError,
    RouteValidationError,
    SatelliteProviderRouteError,
)
from gps_denied_onboard.components.c11_tile_manager.route_client import (
    RouteSeedResult,
    SatelliteProviderRouteClient,
)
from gps_denied_onboard.replay_input.tlog_route import RouteSpec

_BASE_URL = "https://parent-suite.test"
_JWT = "test-jwt-az838"
_ROUTE_CREATE_PATH = "/api/satellite/route"
_ROUTE_STATUS_PATH_PREFIX = "/api/satellite/route/"
_INVENTORY_PATH = "/api/satellite/tiles/inventory"


# ----------------------------------------------------------------------
# Fixtures
# ----------------------------------------------------------------------


def _make_spec(
    waypoints: tuple[tuple[float, float], ...] | None = None,
    *,
    region_size: float = 500.0,
    source: Path | None = None,
) -> RouteSpec:
    return RouteSpec(
        waypoints=waypoints
        or (
            (49.5731, 36.4456),
            (49.5750, 36.4470),
            (49.5770, 36.4490),
        ),
        suggested_region_size_meters=region_size,
        source_tlog=source or Path("tests/fixtures/derkachi_c6/derkachi.tlog"),
        source_segment=(0, 99),
        total_distance_meters=2500.0,
    )


def _make_log_capture() -> tuple[logging.Logger, list[logging.LogRecord]]:
    records: list[logging.LogRecord] = []

    class _Handler(logging.Handler):
        def emit(self, record: logging.LogRecord) -> None:
            records.append(record)

    logger = logging.getLogger(f"test_az838_{id(records)}")
    logger.handlers.clear()
    logger.addHandler(_Handler())
    logger.setLevel(logging.DEBUG)
    logger.propagate = False
    return logger, records


def _build_client(
    transport: httpx.MockTransport,
    *,
    poll_max_attempts: int = 5,
    poll_interval_s: float = 0.0001,
    sleeps: list[float] | None = None,
    logger: logging.Logger | None = None,
) -> tuple[SatelliteProviderRouteClient, httpx.Client]:
    http_client = httpx.Client(transport=transport, base_url=_BASE_URL)
    sleeps_target = sleeps if sleeps is not None else []
    client = SatelliteProviderRouteClient(
        base_url=_BASE_URL,
        jwt=_JWT,
        request_timeout_s=5.0,
        poll_interval_s=poll_interval_s,
        poll_max_attempts=poll_max_attempts,
        http_client=http_client,
        sleep=sleeps_target.append,
        logger=logger,
    )
    return client, http_client


def _route_status_url(route_id: uuid.UUID) -> str:
    return f"{_BASE_URL}{_ROUTE_STATUS_PATH_PREFIX}{route_id}"


# ----------------------------------------------------------------------
# Happy path (AC-1, AC-2 happy)
# ----------------------------------------------------------------------


def test_seed_route_happy_path_posts_canonical_wire_shape() -> None:
    # Arrange
    spec = _make_spec()
    captured_post: dict = {}
    captured_inventory: dict = {}
    poll_calls: list[str] = []

    def handler(request: httpx.Request) -> httpx.Response:
        if request.method == "POST" and request.url.path == _ROUTE_CREATE_PATH:
            captured_post["headers"] = dict(request.headers)
            captured_post["body"] = json.loads(request.content)
            return httpx.Response(200, json={"status": "submitted"})
        if (
            request.method == "GET"
            and request.url.path.startswith(_ROUTE_STATUS_PATH_PREFIX)
        ):
            poll_calls.append(request.url.path)
            return httpx.Response(
                200,
                json={"status": "completed", "mapsReady": True},
            )
        if request.method == "POST" and request.url.path == _INVENTORY_PATH:
            captured_inventory["body"] = json.loads(request.content)
            tiles = json.loads(request.content)["tiles"]
            return httpx.Response(
                200,
                json={
                    "results": [
                        {**t, "present": True, "etag": "abc"}
                        for t in tiles
                    ]
                },
            )
        return httpx.Response(404)

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport)
    try:
        # Act
        result = client.seed_route(spec, name="route-test", zoom_level=18)

        # Assert
        body = captured_post["body"]
        assert uuid.UUID(body["id"]).int != 0
        assert body["name"] == "route-test"
        assert body["regionSizeMeters"] == 500.0
        assert body["zoomLevel"] == 18
        assert body["requestMaps"] is True
        assert body["createTilesZip"] is False
        assert body["points"] == [
            {"lat": 49.5731, "lon": 36.4456},
            {"lat": 49.5750, "lon": 36.4470},
            {"lat": 49.5770, "lon": 36.4490},
        ]
        assert captured_post["headers"]["authorization"] == f"Bearer {_JWT}"

        assert isinstance(result, RouteSeedResult)
        assert result.route_id == uuid.UUID(body["id"])
        assert result.terminal_status == "completed"
        assert result.maps_ready is True
        assert result.tile_count > 0
        assert result.elapsed_ms >= 0
        assert len(result.submitted_payload_sha256) == 64
        assert len(poll_calls) == 1

        inventory_tiles = captured_inventory["body"]["tiles"]
        assert all(t["z"] == 18 for t in inventory_tiles)
    finally:
        http_client.close()


# ----------------------------------------------------------------------
# AC-2: poll budget exhaustion
# ----------------------------------------------------------------------


def test_seed_route_polls_until_maps_ready() -> None:
    # Arrange
    poll_count = {"n": 0}

    def handler(request: httpx.Request) -> httpx.Response:
        if request.method == "POST" and request.url.path == _ROUTE_CREATE_PATH:
            return httpx.Response(200, json={"status": "submitted"})
        if request.method == "GET":
            poll_count["n"] += 1
            if poll_count["n"] < 3:
                return httpx.Response(
                    200,
                    json={"status": "processing", "mapsReady": False},
                )
            return httpx.Response(
                200,
                json={"status": "completed", "mapsReady": True},
            )
        if request.method == "POST" and request.url.path == _INVENTORY_PATH:
            tiles = json.loads(request.content)["tiles"]
            return httpx.Response(
                200,
                json={"results": [{**t, "present": True} for t in tiles]},
            )
        return httpx.Response(404)

    transport = httpx.MockTransport(handler)
    sleeps: list[float] = []
    client, http_client = _build_client(
        transport, poll_max_attempts=10, sleeps=sleeps
    )
    try:
        # Act
        result = client.seed_route(_make_spec())

        # Assert
        assert result.maps_ready is True
        assert poll_count["n"] == 3
        assert len(sleeps) == 2
    finally:
        http_client.close()


def test_seed_route_raises_terminal_when_budget_exhausted() -> None:
    # Arrange
    poll_count = {"n": 0}

    def handler(request: httpx.Request) -> httpx.Response:
        if request.method == "POST" and request.url.path == _ROUTE_CREATE_PATH:
            return httpx.Response(200, json={"status": "submitted"})
        if request.method == "GET":
            poll_count["n"] += 1
            return httpx.Response(
                200,
                json={"status": "processing", "mapsReady": False},
            )
        return httpx.Response(404)

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport, poll_max_attempts=4)
    try:
        # Act + Assert
        with pytest.raises(RouteTerminalFailureError) as exc_info:
            client.seed_route(_make_spec())
        assert poll_count["n"] == 4
        assert exc_info.value.route_id is not None
    finally:
        http_client.close()


# ----------------------------------------------------------------------
# AC-3: 4xx + RFC 7807 ProblemDetails
# ----------------------------------------------------------------------


def test_seed_route_4xx_problem_details_to_validation_error() -> None:
    # Arrange
    problem_body = {
        "type": "https://example.com/probs/validation",
        "title": "One or more validation errors occurred.",
        "status": 400,
        "errors": {
            "regionSizeMeters": [
                "must be between 100 and 10000 meters."
            ],
            "points[0].lat": ["must be in [-90, 90]"],
        },
    }

    def handler(request: httpx.Request) -> httpx.Response:
        return httpx.Response(400, json=problem_body)

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport)
    try:
        # Act + Assert
        with pytest.raises(RouteValidationError) as exc_info:
            client.seed_route(_make_spec())
        assert exc_info.value.http_status == 400
        assert "regionSizeMeters" in exc_info.value.field_errors
        assert exc_info.value.field_errors["points[0].lat"] == [
            "must be in [-90, 90]"
        ]
    finally:
        http_client.close()


def test_seed_route_4xx_without_problem_details_still_raises_validation() -> None:
    # Arrange
    def handler(request: httpx.Request) -> httpx.Response:
        return httpx.Response(403, text="forbidden")

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport)
    try:
        # Act + Assert
        with pytest.raises(RouteValidationError) as exc_info:
            client.seed_route(_make_spec())
        assert exc_info.value.http_status == 403
        assert exc_info.value.field_errors == {}
    finally:
        http_client.close()


# ----------------------------------------------------------------------
# AC-4: 5xx / network / timeout
# ----------------------------------------------------------------------


def test_seed_route_5xx_to_transient_error() -> None:
    # Arrange
    def handler(request: httpx.Request) -> httpx.Response:
        return httpx.Response(503, text="service unavailable")

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport)
    try:
        # Act + Assert
        with pytest.raises(RouteTransientError):
            client.seed_route(_make_spec())
    finally:
        http_client.close()


def test_seed_route_network_error_preserves_cause() -> None:
    # Arrange
    def handler(request: httpx.Request) -> httpx.Response:
        raise httpx.ConnectError("simulated TCP refused")

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport)
    try:
        # Act
        with pytest.raises(RouteTransientError) as exc_info:
            client.seed_route(_make_spec())

        # Assert
        assert isinstance(exc_info.value.__cause__, httpx.ConnectError)
    finally:
        http_client.close()


def test_seed_route_timeout_preserves_cause() -> None:
    # Arrange
    def handler(request: httpx.Request) -> httpx.Response:
        raise httpx.ReadTimeout("simulated read timeout")

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport)
    try:
        # Act + Assert
        with pytest.raises(RouteTransientError) as exc_info:
            client.seed_route(_make_spec())
        assert isinstance(exc_info.value.__cause__, httpx.ReadTimeout)
    finally:
        http_client.close()


# ----------------------------------------------------------------------
# AC-5: terminal failure
# ----------------------------------------------------------------------


def test_seed_route_terminal_failure_status_raises() -> None:
    # Arrange
    failure_payload = {
        "status": "failed",
        "mapsReady": False,
        "error": "tile fetch exhausted retries",
    }

    def handler(request: httpx.Request) -> httpx.Response:
        if request.method == "POST" and request.url.path == _ROUTE_CREATE_PATH:
            return httpx.Response(200, json={"status": "submitted"})
        if request.method == "GET":
            return httpx.Response(200, json=failure_payload)
        return httpx.Response(404)

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport)
    try:
        # Act
        with pytest.raises(RouteTerminalFailureError) as exc_info:
            client.seed_route(_make_spec())

        # Assert
        assert exc_info.value.detail == failure_payload
        assert exc_info.value.route_id is not None
    finally:
        http_client.close()


# ----------------------------------------------------------------------
# AC-6: pre-emptive validation (pre-POST)
# ----------------------------------------------------------------------


def _build_no_http_client() -> SatelliteProviderRouteClient:
    """Build a client whose transport rejects every HTTP call.

    Used to verify pre-emptive validation rejects inputs BEFORE any
    HTTP request leaves the client.
    """

    def handler(request: httpx.Request) -> httpx.Response:
        raise AssertionError(
            f"unexpected HTTP request after pre-emptive validation: "
            f"{request.method} {request.url}"
        )

    transport = httpx.MockTransport(handler)
    http_client = httpx.Client(transport=transport, base_url=_BASE_URL)
    return SatelliteProviderRouteClient(
        base_url=_BASE_URL,
        jwt=_JWT,
        http_client=http_client,
    )


def test_preemptive_rejects_empty_points() -> None:
    # Arrange
    spec = RouteSpec(
        waypoints=(),
        suggested_region_size_meters=500.0,
        source_tlog=Path("tlog"),
        source_segment=(0, 0),
        total_distance_meters=0.0,
    )
    client = _build_no_http_client()

    # Act + Assert
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(spec)
    assert "points" in exc_info.value.field_errors


def test_preemptive_rejects_too_many_points() -> None:
    # Arrange — server validator caps at 500, so 501 is the trigger.
    spec = RouteSpec(
        waypoints=tuple(
            (49.0 + i * 1e-5, 36.0 + i * 1e-5) for i in range(501)
        ),
        suggested_region_size_meters=500.0,
        source_tlog=Path("tlog"),
        source_segment=(0, 500),
        total_distance_meters=10.0,
    )
    client = _build_no_http_client()

    # Act + Assert
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(spec)
    assert "points" in exc_info.value.field_errors


def test_preemptive_rejects_zero_region_size() -> None:
    client = _build_no_http_client()
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(_make_spec(), region_size_meters=0.0)
    assert "regionSizeMeters" in exc_info.value.field_errors


def test_preemptive_rejects_oversized_region() -> None:
    client = _build_no_http_client()
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(_make_spec(), region_size_meters=10_001.0)
    assert "regionSizeMeters" in exc_info.value.field_errors


def test_preemptive_rejects_oor_zoom_high() -> None:
    client = _build_no_http_client()
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(_make_spec(), zoom_level=23)
    assert "zoomLevel" in exc_info.value.field_errors


def test_preemptive_rejects_oor_zoom_low() -> None:
    client = _build_no_http_client()
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(_make_spec(), zoom_level=-1)
    assert "zoomLevel" in exc_info.value.field_errors


def test_preemptive_rejects_oor_lat() -> None:
    spec = _make_spec(waypoints=((100.0, 36.0), (49.0, 36.0)))
    client = _build_no_http_client()
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(spec)
    assert any(k.startswith("points[") for k in exc_info.value.field_errors)


def test_preemptive_rejects_oor_lon() -> None:
    spec = _make_spec(waypoints=((49.0, 200.0), (49.0, 36.0)))
    client = _build_no_http_client()
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(spec)
    assert any(k.startswith("points[") for k in exc_info.value.field_errors)


def test_preemptive_rejects_oversized_name() -> None:
    client = _build_no_http_client()
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(_make_spec(), name="x" * 201)
    assert "name" in exc_info.value.field_errors


def test_preemptive_rejects_oversized_description() -> None:
    client = _build_no_http_client()
    with pytest.raises(RouteValidationError) as exc_info:
        client.seed_route(_make_spec(), description="x" * 1001)
    assert "description" in exc_info.value.field_errors


# ----------------------------------------------------------------------
# AC-7: dry-run / build_planned_payload
# ----------------------------------------------------------------------


def test_build_planned_payload_runs_without_http() -> None:
    # Arrange
    client = _build_no_http_client()

    # Act
    body, sha256 = client.build_planned_payload(
        _make_spec(),
        name="dry-run-test",
        zoom_level=18,
    )

    # Assert
    assert body["name"] == "dry-run-test"
    assert body["regionSizeMeters"] == 500.0
    assert body["zoomLevel"] == 18
    assert body["requestMaps"] is True
    assert body["createTilesZip"] is False
    assert len(body["points"]) == 3
    assert len(sha256) == 64


def test_build_planned_payload_is_deterministic_for_same_inputs() -> None:
    # Arrange — same name + same spec must produce the same sha256
    # (route_id varies, so the body itself differs; the sha256 is over
    # the canonical JSON, so it varies too — assert that it's stable
    # WITHIN one build but distinct per call due to fresh route_id).
    client = _build_no_http_client()

    # Act
    body_a, sha_a = client.build_planned_payload(
        _make_spec(), name="same-name", zoom_level=18
    )
    body_b, sha_b = client.build_planned_payload(
        _make_spec(), name="same-name", zoom_level=18
    )

    # Assert
    assert body_a["id"] != body_b["id"]
    assert sha_a != sha_b


def test_build_planned_payload_runs_validation() -> None:
    # Arrange
    client = _build_no_http_client()

    # Act + Assert — dry-run must surface OOR zoom the same as a live run
    with pytest.raises(RouteValidationError):
        client.build_planned_payload(_make_spec(), zoom_level=99)


# ----------------------------------------------------------------------
# Constructor sanity
# ----------------------------------------------------------------------


def test_constructor_rejects_empty_base_url() -> None:
    with pytest.raises(ValueError):
        SatelliteProviderRouteClient(base_url="", jwt="x")


def test_constructor_rejects_empty_jwt() -> None:
    with pytest.raises(ValueError):
        SatelliteProviderRouteClient(base_url="https://x", jwt="")


def test_constructor_rejects_nonpositive_timeout() -> None:
    with pytest.raises(ValueError):
        SatelliteProviderRouteClient(
            base_url="https://x", jwt="y", request_timeout_s=0.0
        )


def test_constructor_rejects_nonpositive_poll_interval() -> None:
    with pytest.raises(ValueError):
        SatelliteProviderRouteClient(
            base_url="https://x", jwt="y", poll_interval_s=0.0
        )


def test_constructor_rejects_nonpositive_poll_max_attempts() -> None:
    with pytest.raises(ValueError):
        SatelliteProviderRouteClient(
            base_url="https://x", jwt="y", poll_max_attempts=0
        )


# ----------------------------------------------------------------------
# Error class hierarchy
# ----------------------------------------------------------------------


def test_route_error_subclass_relationships() -> None:
    # Assert
    assert issubclass(RouteValidationError, SatelliteProviderRouteError)
    assert issubclass(RouteTransientError, SatelliteProviderRouteError)
    assert issubclass(RouteTerminalFailureError, SatelliteProviderRouteError)


# ----------------------------------------------------------------------
# Inventory edge cases
# ----------------------------------------------------------------------


def test_inventory_404_during_verify_raises_validation() -> None:
    # Arrange — route POST OK, polling reports ready, inventory 404s.
    def handler(request: httpx.Request) -> httpx.Response:
        if request.method == "POST" and request.url.path == _ROUTE_CREATE_PATH:
            return httpx.Response(200, json={"status": "submitted"})
        if request.method == "GET":
            return httpx.Response(
                200, json={"status": "completed", "mapsReady": True}
            )
        if request.method == "POST" and request.url.path == _INVENTORY_PATH:
            return httpx.Response(404, text="not found")
        return httpx.Response(404)

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport)
    try:
        # Act + Assert
        with pytest.raises(RouteValidationError):
            client.seed_route(_make_spec())
    finally:
        http_client.close()


def test_logging_emits_structured_extra_for_submit_and_poll() -> None:
    # Arrange
    logger, records = _make_log_capture()

    def handler(request: httpx.Request) -> httpx.Response:
        if request.method == "POST" and request.url.path == _ROUTE_CREATE_PATH:
            return httpx.Response(200, json={"status": "submitted"})
        if request.method == "GET":
            return httpx.Response(
                200, json={"status": "completed", "mapsReady": True}
            )
        if request.method == "POST" and request.url.path == _INVENTORY_PATH:
            tiles = json.loads(request.content)["tiles"]
            return httpx.Response(
                200, json={"results": [{**t, "present": True} for t in tiles]}
            )
        return httpx.Response(404)

    transport = httpx.MockTransport(handler)
    client, http_client = _build_client(transport, logger=logger)
    try:
        # Act
        client.seed_route(_make_spec())

        # Assert — at minimum we expect submit + one poll-tick + terminal + inventory
        kinds = {getattr(r, "kind", None) for r in records}
        assert "c11.route.submit" in kinds
        assert "c11.route.poll.tick" in kinds
        assert "c11.route.poll.terminal" in kinds
        assert "c11.route.inventory" in kinds
    finally:
        http_client.close()