#!/usr/bin/env bash
#
# Generates the Google Play store graphics from the app's own icon vectors.
#
#   ./tools/make-store-assets.sh [output-dir]        # default: ./store-assets
#
# Produces, matching Play's asset specs (support.google.com/.../answer/9866151):
#   icon-512.png                  512 x 512   32-bit PNG *with* alpha (ours is full-bleed,
#                                               so every pixel ends up opaque anyway)
#   feature-graphic-1024x500.png  1024 x 500  24-bit PNG, no alpha
#
# Output lands in ./store-assets/ *inside* the repo, never in $HOME: the editable sources are
# the SVGs in tools/store-assets/ and these PNGs are the files that get uploaded to the Play
# Console, so they belong with the release they were made for. Pass a directory to override.
set -euo pipefail

here="$(cd "$(dirname "$0")" && pwd)"
repo="$(dirname "$here")"
out="${1:-$repo/store-assets}"
mkdir -p "$out"

render() { # <svg> <width> <height> <filename> <keep-alpha|flatten>
    local svg="$1" width="$2" height="$3" name="$4" mode="$5"
    inkscape "$svg" \
        --export-type=png --export-width="$width" --export-height="$height" \
        --export-filename="$out/$name" >/dev/null 2>&1
    if [ "$mode" = keep-alpha ]; then
        # Play asks for a 32-bit PNG here. The SVG's background rect covers the whole
        # canvas, so the alpha channel is fully opaque — no accidental transparency.
        magick "$out/$name" -alpha on PNG32:"$out/$name"
    else
        magick "$out/$name" -background '#1B5E20' -alpha remove -alpha off PNG24:"$out/$name"
    fi
    printf '  %s  ' "$out/$name"
    identify -format '%wx%h  %[channels]  %b\n' "$out/$name"
}

echo "Writing store assets to $out"
render "$here/store-assets/icon.svg" 512 512 icon-512.png keep-alpha
render "$here/store-assets/feature-graphic.svg" 1024 500 feature-graphic-1024x500.png flatten
echo "Done. Screenshots: ./tools/make-store-screenshots.sh   # reads store-assets/raw-screenshots/phone/"
echo "      Tablets:     FORM_FACTOR=tablet-7in ./tools/make-store-screenshots.sh"
echo "                   FORM_FACTOR=tablet-10in ./tools/make-store-screenshots.sh"