#!/usr/bin/env bash
#
# Turns raw device screenshots into Play-legal store screenshots.
#
#   ./tools/make-store-screenshots.sh [raw-dir] [output-dir]
#
# Both paths default to inside the repo, never to $HOME:
#   raw     store-assets/raw-screenshots/   git-ignored staging for the `adb` captures
#   output  store-assets/screenshots/       the cropped files that get uploaded to Play
#
# Why this exists: Play rejects a screenshot whose longer side is more than twice its
# shorter side ("your screenshot's maximum dimension can't be more than twice its minimum
# dimension"). A 1080 x 2400 phone capture is 2.22:1, so it has to become 1080 x 2160.
#
# The crop removes system chrome only — the status bar at the top, the navigation bar at the
# bottom — never app content. Both heights were measured on the test device:
#
#   STATUS_BAR_PX   ITYPE_STATUS_BAR frame height      93 px  (1080 x 2400 @ 440 dpi)
#   NAV_BAR_PX      ITYPE_NAVIGATION_BAR bottom inset 130 px  (same device)
#
#   adb shell dumpsys window displays | grep -oE 'ITYPE_STATUS_BAR frame=\[[^]]*\]\[[^]]*\]'
#   adb shell dumpsys window displays | grep -oE 'control type=ITYPE_NAVIGATION_BAR.*mInsetsHint=\{[^}]*\}'
#
# Output is 24-bit PNG without alpha, which is what Play asks for. Captures are not shot by
# this script — take them yourself (the shot list is in docs/STORE_LISTING.md) and drop them
# into store-assets/raw-screenshots/, or pass the directory as the first argument.
set -euo pipefail

here="$(cd "$(dirname "$0")" && pwd)"
repo="$(dirname "$here")"
raw="${1:-$repo/store-assets/raw-screenshots}"
out="${2:-$repo/store-assets/screenshots}"
status_bar="${STATUS_BAR_PX:-93}"
nav_bar="${NAV_BAR_PX:-130}"

if [ ! -d "$raw" ]; then
    echo "usage: $0 [raw-screenshot-dir] [output-dir]" >&2
    echo "error: no such directory: $raw" >&2
    echo "       capture first, e.g. adb exec-out screencap -p > $raw/01-empty.png" >&2
    exit 2
fi

mkdir -p "$out"

shopt -s nullglob
for f in "$raw"/*.png; do
    name="$(basename "$f")"
    width="$(identify -format '%w' "$f")"
    height="$(identify -format '%h' "$f")"

    # Drop the two system bars, then clamp to a 2:1 portrait frame.
    keep=$(( height - status_bar - nav_bar ))
    cap=$(( width * 2 ))
    if [ "$keep" -gt "$cap" ]; then
        keep="$cap"
    fi

    magick "$f" -crop "${width}x${keep}+0+${status_bar}" +repage \
        -background '#FFFBFE' -alpha remove -alpha off PNG24:"$out/$name"
    printf '  %s  %s -> ' "$name" "$(identify -format '%wx%h' "$f")"
    identify -format '%wx%h  %[channels]  %b\n' "$out/$name"
done