"""AZ-700 — render_map CLI + HTML renderer unit tests.

Covers AC-1 (CLI smoke + valid HTML), AC-2 (two distinct
polylines), AC-3 (4 markers + 100 m + 50 m circles), and AC-4
(summary embedding). AC-5 (offline-tiles flag) is exercised via a
dedicated test.

Folium is an optional dependency (``[operator-tools]`` group);
these tests skip cleanly when it is not importable so the airborne
test suite stays green even when the operator extra is absent.

Style: every test follows the Arrange / Act / Assert pattern.
"""

from __future__ import annotations

import json
import struct
from pathlib import Path

import pytest

folium = pytest.importorskip(
    "folium",
    reason="folium is an operator-only dep; install gps-denied-onboard[operator-tools]",
)

from gps_denied_onboard.cli.render_map import (
    RenderInputs,
    _build_argparser,
    load_estimated_track,
    load_ground_truth_track,
    main,
    render_map_html,
)


def _write_minimal_tlog(path: Path, fixes: list[tuple[float, float, float]]) -> None:
    """Write a tiny binary tlog with ``GLOBAL_POSITION_INT`` only.

    Format: ``<u64 big-endian timestamp_us><MAVLink2 msg bytes>``,
    repeated. ``load_tlog_ground_truth`` ignores everything except
    ``GLOBAL_POSITION_INT`` / ``GPS_RAW_INT``, so the minimal schema
    is just one ``GLOBAL_POSITION_INT`` per fix.
    """
    from pymavlink.dialects.v20 import ardupilotmega as mavlink

    mav = mavlink.MAVLink(file=None, srcSystem=1, srcComponent=1)
    with path.open("wb") as fp:
        for i, (lat, lon, alt) in enumerate(fixes):
            time_boot_ms = i * 500
            msg = mav.global_position_int_encode(
                time_boot_ms=time_boot_ms,
                lat=int(lat * 1e7),
                lon=int(lon * 1e7),
                alt=int(alt * 1000),
                relative_alt=int(alt * 1000),
                vx=0,
                vy=0,
                vz=0,
                hdg=0,
            )
            payload = msg.pack(mav)
            ts_us = i * 500_000
            fp.write(struct.pack(">Q", ts_us))
            fp.write(payload)


# ---------------------------------------------------------------------
# Helpers


def _write_jsonl(path: Path, rows: list[dict[str, object]]) -> None:
    path.write_text("\n".join(json.dumps(r) for r in rows) + "\n")


def _example_inputs() -> RenderInputs:
    return RenderInputs(
        estimated_track=[
            (50.0, 30.0),
            (50.001, 30.001),
            (50.002, 30.002),
        ],
        truth_track=[
            (50.0, 30.0),
            (50.0005, 30.0005),
            (50.001, 30.001),
        ],
        summary_markdown=None,
        title="unit-test",
    )


# ---------------------------------------------------------------------
# load_estimated_track / load_ground_truth_track


def test_load_estimated_track_skips_blank_lines(tmp_path: Path) -> None:
    # Arrange
    path = tmp_path / "out.jsonl"
    path.write_text(
        '{"position_wgs84":{"lat_deg":50.0,"lon_deg":30.0,"alt_m":100}}\n'
        "\n"
        '{"position_wgs84":{"lat_deg":50.1,"lon_deg":30.1,"alt_m":110}}\n'
    )

    # Act
    track = load_estimated_track(path)

    # Assert
    assert track == [(50.0, 30.0), (50.1, 30.1)]


def test_load_estimated_track_raises_on_missing_position(tmp_path: Path) -> None:
    # Arrange
    path = tmp_path / "out.jsonl"
    path.write_text('{"frame_id":1}\n')

    # Act / Assert
    with pytest.raises(ValueError, match="missing position_wgs84"):
        load_estimated_track(path)


def test_load_estimated_track_raises_on_non_numeric_lat(tmp_path: Path) -> None:
    # Arrange
    path = tmp_path / "out.jsonl"
    path.write_text(
        '{"position_wgs84":{"lat_deg":"oops","lon_deg":30.0}}\n'
    )

    # Act / Assert
    with pytest.raises(ValueError, match="non-numeric lat/lon"):
        load_estimated_track(path)


# ---------------------------------------------------------------------
# render_map_html


def test_render_map_html_emits_two_polylines() -> None:
    # Act
    html = render_map_html(_example_inputs())

    # Assert — AC-2: two distinct polyline layers with our pinned colors.
    assert html.count("L.polyline") == 2, (
        "expected exactly 2 polylines (truth + estimated); "
        f"saw {html.count('L.polyline')}"
    )
    assert '"color": "red"' in html, "truth polyline (red) missing"
    assert '"color": "blue"' in html, "estimated polyline (blue) missing"


def test_render_map_html_emits_four_markers_and_two_circles() -> None:
    # Act
    html = render_map_html(_example_inputs())

    # Assert — AC-3: 2 markers per track (start + end) = 4 total.
    assert html.count("L.marker") == 4, (
        f"expected 4 markers; saw {html.count('L.marker')}"
    )
    # Scale circles at the truth start: radius 100 + 50.
    assert html.count("L.circle") == 2, (
        f"expected 2 scale circles (100 m + 50 m); "
        f"saw {html.count('L.circle')}"
    )
    assert '"radius": 100.0' in html
    assert '"radius": 50.0' in html


def test_render_map_html_embeds_summary_when_provided() -> None:
    # Arrange
    inputs = RenderInputs(
        estimated_track=[(50.0, 30.0), (50.001, 30.001)],
        truth_track=[(50.0, 30.0), (50.0005, 30.0005)],
        summary_markdown=(
            "# Real-flight validation — 2026-05-20\n"
            "**Verdict**: PASS\n"
            "| Mean | 12.3 |"
        ),
        title="t",
    )

    # Act
    html = render_map_html(inputs)

    # Assert — AC-4: the markdown body shows up in the HTML.
    assert "Real-flight validation" in html
    assert "**Verdict**: PASS" in html  # noqa: E501 — escape allowed since `*` is not HTML-special
    # HTML special chars are escaped — pipe characters stay raw, but
    # the angle brackets used in markdown's emphasis would. We don't
    # want script injection, so confirm the wrapper div is present.
    assert "white-space:pre-wrap" in html


def test_render_map_html_raises_on_both_tracks_empty() -> None:
    # Arrange
    inputs = RenderInputs(
        estimated_track=[],
        truth_track=[],
        summary_markdown=None,
        title="empty",
    )

    # Act / Assert
    with pytest.raises(ValueError, match="empty"):
        render_map_html(inputs)


def test_render_map_html_offline_tiles_omits_openstreetmap() -> None:
    # Act
    html_default = render_map_html(_example_inputs())
    html_offline = render_map_html(_example_inputs(), offline_tiles=True)

    # Assert — `tiles=None` removes the default OpenStreetMap tile URL.
    assert "openstreetmap" in html_default.lower()
    assert "openstreetmap" not in html_offline.lower()


def test_render_map_html_offline_tiles_template_uses_local_url() -> None:
    # Act
    html = render_map_html(
        _example_inputs(),
        offline_tiles_template="file:///opt/tiles/{z}/{x}/{y}.png",
    )

    # Assert
    assert "file:///opt/tiles/{z}/{x}/{y}.png" in html
    assert "local offline tile bundle" in html


# ---------------------------------------------------------------------
# CLI smoke (AC-1)


def test_cli_writes_html_with_default_tiles(tmp_path: Path) -> None:
    # Arrange
    estimated = tmp_path / "estimator.jsonl"
    _write_jsonl(
        estimated,
        [
            {"position_wgs84": {"lat_deg": 50.0, "lon_deg": 30.0, "alt_m": 100}},
            {"position_wgs84": {"lat_deg": 50.001, "lon_deg": 30.001, "alt_m": 101}},
        ],
    )

    truth = tmp_path / "synth.tlog"
    _write_minimal_tlog(
        truth,
        [(50.0, 30.0, 100.0), (50.0005, 30.0005, 100.0), (50.001, 30.001, 100.0)],
    )

    output = tmp_path / "map.html"

    # Act
    rc = main(
        [
            "--estimated", str(estimated),
            "--truth", str(truth),
            "--output", str(output),
        ]
    )

    # Assert — AC-1: clean exit + non-empty HTML.
    assert rc == 0
    assert output.is_file()
    body = output.read_text()
    assert body.startswith("<!DOCTYPE html>")
    assert len(body) > 1000


def test_cli_embeds_summary_when_flag_supplied(tmp_path: Path) -> None:
    # Arrange
    estimated = tmp_path / "estimator.jsonl"
    _write_jsonl(
        estimated,
        [
            {"position_wgs84": {"lat_deg": 50.0, "lon_deg": 30.0, "alt_m": 100}},
            {"position_wgs84": {"lat_deg": 50.001, "lon_deg": 30.001, "alt_m": 101}},
        ],
    )

    truth = tmp_path / "synth.tlog"
    _write_minimal_tlog(truth, [(50.0, 30.0, 100.0), (50.001, 30.001, 100.0)])

    summary = tmp_path / "real_flight_validation_2026-05-20.md"
    summary.write_text(
        "# Real-flight validation — 2026-05-20\n"
        "**Verdict**: FAIL\n\n"
        "## Horizontal error (metres)\n"
        "| Mean | 142.5 |\n"
    )

    output = tmp_path / "map.html"

    # Act
    rc = main(
        [
            "--estimated", str(estimated),
            "--truth", str(truth),
            "--output", str(output),
            "--summary", str(summary),
        ]
    )

    # Assert — AC-4
    assert rc == 0
    body = output.read_text()
    assert "Real-flight validation" in body
    assert "**Verdict**: FAIL" in body
    assert "Mean | 142.5" in body


def test_cli_fails_fast_when_summary_path_missing(tmp_path: Path) -> None:
    # Arrange
    estimated = tmp_path / "estimator.jsonl"
    _write_jsonl(
        estimated,
        [
            {"position_wgs84": {"lat_deg": 50.0, "lon_deg": 30.0, "alt_m": 100}},
        ],
    )
    truth = tmp_path / "synth.tlog"
    _write_minimal_tlog(truth, [(50.0, 30.0, 100.0), (50.001, 30.001, 100.0)])

    output = tmp_path / "map.html"
    missing_summary = tmp_path / "does_not_exist.md"

    # Act
    rc = main(
        [
            "--estimated", str(estimated),
            "--truth", str(truth),
            "--output", str(output),
            "--summary", str(missing_summary),
        ]
    )

    # Assert
    assert rc == 2
    assert not output.exists(), "must not write the map when summary path is invalid"


def test_argparser_requires_three_paths() -> None:
    # Arrange
    parser = _build_argparser()

    # Act / Assert
    with pytest.raises(SystemExit):
        parser.parse_args([])
    with pytest.raises(SystemExit):
        parser.parse_args(["--estimated", "/tmp/a.jsonl"])


# ---------------------------------------------------------------------
# load_ground_truth_track integration with AZ-697


def test_load_ground_truth_track_returns_lat_lon_pairs(tmp_path: Path) -> None:
    # Arrange — synthesize a minimal tlog and round-trip through AZ-697.
    tlog_path = tmp_path / "synth.tlog"
    _write_minimal_tlog(
        tlog_path,
        [(50.000, 30.000, 100.0), (50.001, 30.001, 101.0), (50.002, 30.002, 102.0)],
    )

    # Act
    track = load_ground_truth_track(tlog_path)

    # Assert
    assert len(track) == 3
    for lat, lon in track:
        assert 49.99 < lat < 50.01
        assert 29.99 < lon < 30.01


# ---------------------------------------------------------------------
# AZ-960 — CSV-path dispatch for --truth


def _write_minimal_csv(path: Path) -> None:
    """Write a tiny AZ-896-schema CSV with 3 GPS rows for AZ-960 tests."""
    header = (
        "timestamp(ms),Time,"
        "SCALED_IMU2.xacc,SCALED_IMU2.yacc,SCALED_IMU2.zacc,"
        "SCALED_IMU2.xgyro,SCALED_IMU2.ygyro,SCALED_IMU2.zgyro,"
        "GLOBAL_POSITION_INT.lat,GLOBAL_POSITION_INT.lon,"
        "GLOBAL_POSITION_INT.alt,GLOBAL_POSITION_INT.vx,"
        "GLOBAL_POSITION_INT.vy,GLOBAL_POSITION_INT.vz,"
        "GLOBAL_POSITION_INT.hdg"
    )
    rows = [
        "0,0.0,21,-3,-984,52,32,-5,50.000,30.000,141290,0,0,0,35041",
        "100,0.1,-68,-9,-995,58,-17,1,50.0005,30.0005,141360,0,0,0,35042",
        "200,0.2,9,108,-988,69,-65,13,50.001,30.001,141410,0,0,0,35048",
    ]
    path.write_text(header + "\n" + "\n".join(rows) + "\n")


def test_load_ground_truth_track_dispatches_to_csv_loader(
    tmp_path: Path,
) -> None:
    # Arrange — AC-1: csv extension routes through load_csv_ground_truth
    csv_path = tmp_path / "data_imu.csv"
    _write_minimal_csv(csv_path)

    # Act
    track = load_ground_truth_track(csv_path)

    # Assert
    assert len(track) == 3
    for lat, lon in track:
        assert 49.999 < lat < 50.002
        assert 29.999 < lon < 30.002


def test_load_ground_truth_track_csv_propagates_schema_error(
    tmp_path: Path,
) -> None:
    # Arrange — AC-4: malformed CSV fails fast via ReplayInputAdapterError
    csv_path = tmp_path / "bad.csv"
    csv_path.write_text(
        "timestamp(ms),SCALED_IMU2.xacc,GLOBAL_POSITION_INT.lat\n"
        "0,0,50.0\n"
    )
    from gps_denied_onboard.replay_input.errors import ReplayInputAdapterError

    # Act / Assert
    with pytest.raises(ReplayInputAdapterError, match="Time"):
        load_ground_truth_track(csv_path)


def test_cli_renders_map_with_csv_truth(tmp_path: Path) -> None:
    # Arrange — AC-1 end-to-end: CLI accepts --truth foo.csv
    csv_path = tmp_path / "data_imu.csv"
    _write_minimal_csv(csv_path)
    estimated = tmp_path / "estimator.jsonl"
    _write_jsonl(
        estimated,
        [
            {"position_wgs84": {"lat_deg": 50.0, "lon_deg": 30.0, "alt_m": 100}},
            {"position_wgs84": {"lat_deg": 50.001, "lon_deg": 30.001, "alt_m": 101}},
        ],
    )
    output = tmp_path / "map.html"

    # Act
    rc = main(
        [
            "--estimated", str(estimated),
            "--truth", str(csv_path),
            "--output", str(output),
        ]
    )

    # Assert
    assert rc == 0
    assert output.is_file()
    body = output.read_text()
    assert body.startswith("<!DOCTYPE html>")
    assert "L.polyline" in body
    assert '"color": "red"' in body
    assert '"color": "blue"' in body