#!/bin/sh
# Downloads the NASA spacecraft models the example scenes use into
# examples/models/nasa/ (gitignored).
#
# Source: NASA 3D Resources (https://github.com/nasa/NASA-3D-Resources), pinned
# to one commit and checked by sha256. NASA describes the collection as free and
# without copyright; NASA's logos and insignia have their own restrictions, see
# https://www.nasa.gov/nasa-brand-center/images-and-media/.
#
# Most of the collection is stored with Draco mesh compression, which this
# crate's loader does not read yet, so those models are decoded with
# gltf-transform (Node, via npx). Node is needed only here, not to build or run
# anything.
#
#   landsat8  Landsat 8, 85k triangles, meters.
#   icesat2   ICESat-2, 752k triangles, meters; the heavy model for benchmarks.
#   ssl1300   A Space Systems Loral 1300 communications satellite, 182k
#             triangles; its units are 10 cm, so scenes scale it by 0.1.
#   ostm      OSTM / Jason-2, 65k triangles; its units are about 29 cm, so
#             scenes scale it by 3.5 (3.5 x 1.9 m, solar panels 1.4 x 0.9 m).
#   ace       Advanced Composition Explorer, 26k triangles; its units are about
#             5 mm, so scenes scale it by 0.00485 (a 1.6 m body).

set -eu

commit=11ebb4ee043715aefbba6aeec8a61746fad67fa7
base="https://raw.githubusercontent.com/nasa/NASA-3D-Resources/$commit/3D%20Models"
gltf_transform='@gltf-transform/cli@4.5.1'

out="$(cd "$(dirname "$0")/.." && pwd)/examples/models/nasa"
mkdir -p "$out"
work=$(mktemp -d)
# npx runs from its own empty directory; downloads are only ever passed as paths.
tools=$(mktemp -d)
trap 'command rm -rf "$work" "$tools"' EXIT

# name, path under 3D Models/, sha256 of the download, whether it is Draco-compressed
fetch() {
    name=$1 path=$2 sum=$3 draco=$4
    if [ -f "$out/$name.glb" ]; then
        echo "have $name"
        return
    fi
    echo "fetching $name"
    curl -fsSL "$base/$path" -o "$work/$name.glb"
    echo "$sum  $work/$name.glb" | sha256sum -c --quiet -
    if [ "$draco" = yes ]; then
        (cd "$tools" && npx --yes "$gltf_transform" copy "$work/$name.glb" "$work/$name.decoded.glb" >/dev/null)
        mv "$work/$name.decoded.glb" "$out/$name.glb"
    else
        mv "$work/$name.glb" "$out/$name.glb"
    fi
}

fetch landsat8 "Landsat%208/Landsat%208.glb" \
    8b599e867be20589cd35e55ed1d46da104299b430b1827b548a25d3fad0a314d yes
fetch icesat2 "Ice,%20Clouds,%20and%20Land%20Elevation%20Satellite-2%20(ICESat-2)%20(C)/Ice,%20Clouds,%20and%20Land%20Elevation%20Satellite-2%20(ICESat-2)%20(C).glb" \
    a842b4d58c32bb612b258489cf9680d439fdb73186ad793deb8fcdd6aa93a8a9 yes
fetch ssl1300 "Space%20Systems%20Loral%20(SSL-1300)/Space%20Systems%20Loral%20(SSL-1300).glb" \
    63cd644d67ee49ab79e313bb6cb0495e9f6072d421a84e116c2c3f9c40bf9c0c yes
fetch ostm "Ocean%20Surface%20Topography%20Mission%20(OSTM%20Jason-2)/Ocean%20Surface%20Topography%20Mission%20(OSTM%20Jason-2).glb" \
    61c58c2b1c9afce77186a781f699aad5b026573b2cb52e4476d7afd57eae2d04 yes
fetch ace "Advanced%20Composition%20Explorer/Advanced%20Composition%20Explorer.glb" \
    b03a394e57b6af3a1f3700f450d94a67dd3eaec8a00e125d2d005bd1359b6e9c no

echo "models in $out"