#!/usr/bin/env python3
"""Single source of truth for where staged actors belong in the DemoMap.

This exists because the same value was written in two places and they drifted:
`ue_hero_facade_import.py` kept the pre-`0.1.0` position `(-12024.5, -1450)` while
`ue_build_demo_map.py` staged the hero at `(-13336, 1307)`. Running the importer on
its own therefore moved the hero **13 m east and onto the north side of the
boulevard** — and nothing complained, because a displaced building still renders.

The values are Unreal centimetres, absolute world space. Every one of them is
verified against `Geo/verification/2026-11-06-el-capitan-block.md` and probed by
`Tools/review/visual_loop.py --verify` (via the demo screenshot expectations) and by the
world-span probes recorded in `MEMORY.md`.

Keep this file boring: constants and one validator, no `unreal` import, so it can
be unit-tested on the host.
"""

from __future__ import annotations

# The hero façade sits INSIDE the frontage gap between 6902 (ends at -17749) and
# the El Capitan Theatre (starts at -12082), so its actor origin is the measured
# building line. The mesh is authored with its front plane 7 cm ahead of the actor
# origin, which is why the X here is the frontage centre and Y is the building line.
HERO_ACTOR = "Hero_Facade"
HERO_LOCATION_CM = (-13336.0, 1307.0, 0.0)

# Tolerance for the span probe: the verified footprints are within ~1 m.
SPAN_TOLERANCE_CM = 100.0

# Expected world span per frontage actor (min X, max X), from the block
# verification notes. Used to prove a staged building is on its own footprint
# rather than merely present.
FRONTAGE_SPANS_CM = {
    "6922": (-24276.0, -17700.0),
    "6902": (-17749.0, -14591.0),
    "hero": (-14644.0, -12028.0),
    "6838": (-12082.0, -8210.0),
    "6822": (-7854.0, -7252.0),
    "6806": (-6608.0, -3307.0),
    "6800": (-3320.0, -1437.0),
}


def span_error(name: str, observed_min: float, observed_max: float):
    """Return (expected_min, expected_max, ok) for an observed building span.

    `name` is a key of `FRONTAGE_SPANS_CM`; `ok` is False when either edge is more
    than `SPAN_TOLERANCE_CM` from the verified value.
    """
    if name not in FRONTAGE_SPANS_CM:
        raise KeyError(f"unknown building {name!r}; known: {sorted(FRONTAGE_SPANS_CM)}")
    exp_min, exp_max = FRONTAGE_SPANS_CM[name]
    ok = (abs(observed_min - exp_min) <= SPAN_TOLERANCE_CM
          and abs(observed_max - exp_max) <= SPAN_TOLERANCE_CM)
    return exp_min, exp_max, ok


def describe_span_failure(name: str, observed_min: float, observed_max: float) -> str:
    """A one-line message for a misplaced building, or "" when it is correct."""
    exp_min, exp_max, ok = span_error(name, observed_min, observed_max)
    if ok:
        return ""
    return (f"{name}: span X {observed_min:.0f}..{observed_max:.0f} does not match the "
            f"verified {exp_min:.0f}..{exp_max:.0f} (±{SPAN_TOLERANCE_CM:.0f} cm)")