"""Static chokepoint preset catalog — one-tap fly-to targets for the map.

Pure data, no upstream calls and no VesselAPI quota spend. ``vesselapi`` is
``True`` only for Hormuz (the single box the VesselAPI poller already covers);
every other strait is AISStream-only until a human later spends quota. Never
call VesselAPI from here.

Bounding boxes are ``minlat,minlon,maxlat,maxlon`` (VesselAPI order) and each
stays within the ``|dLat|+|dLon| <= 4`` span rule enforced by
``vesselapi.validate_bbox_span``.
"""

from __future__ import annotations

# id → preset. ``center`` is ``[lat, lon]`` for Leaflet ``setView``.
_CHOKEPOINTS: tuple[dict, ...] = (
    {
        "id": "hormuz",
        "title": "Strait of Hormuz",
        "bbox": "25.5,55.4,27.3,57.2",
        "center": [26.4, 56.5],
        "zoom": 9,
        "vesselapi": True,
    },
    {
        "id": "bab_el_mandeb",
        "title": "Bab el-Mandeb",
        "bbox": "12.0,42.8,13.5,44.3",
        "center": [12.7, 43.4],
        "zoom": 9,
        "vesselapi": False,
    },
    {
        "id": "suez",
        "title": "Suez / N. Red Sea",
        "bbox": "29.5,32.0,31.0,33.5",
        "center": [30.0,32.5],
        "zoom": 9,
        "vesselapi": False,
    },
    {
        "id": "malacca",
        "title": "Malacca / Singapore",
        "bbox": "1.0,103.0,2.5,104.5",
        "center": [1.3, 103.8],
        "zoom": 9,
        "vesselapi": False,
    },
    {
        "id": "taiwan",
        "title": "Taiwan Strait",
        "bbox": "23.5,119.0,25.0,120.5",
        "center": [24.2, 119.8],
        "zoom": 9,
        "vesselapi": False,
    },
)


def chokepoints() -> list[dict]:
    """Return a fresh copy of the catalog (callers must not mutate the source)."""
    return [dict(p) for p in _CHOKEPOINTS]