#!/usr/bin/env bash
# Generates all icon assets for bincio-rec.
# Requires ImageMagick 7 (magick).
#
# Centering strategy: both letters are rendered with -gravity Center.
# Each letter's centre is offset ±HALF pixels from the canvas centre,
# where HALF = (letter_width + gap) / 2.  This gives mathematically
# correct horizontal & vertical centering regardless of font metrics.

set -e
cd "$(dirname "$0")/.."

FONT="$HOME/Library/Fonts/NotoSans-Bold.ttf"
BG="#09090b"
WHITE="#ffffff"
RED="#ef4444"

# render_br CANVAS BG SIZE HALF OUT
# HALF = how many pixels each letter centre is offset from canvas centre.
render_br() {
  local CANVAS=$1 BG_COL=$2 SIZE=$3 HALF=$4 OUT=$5
  magick -size "${CANVAS}x${CANVAS}" xc:"$BG_COL" \
    -font "$FONT" -pointsize "$SIZE" -gravity Center \
    -fill "$WHITE" -annotate "-${HALF}+0" 'B' \
    -fill "$RED"   -annotate "+${HALF}+0" 'R' \
    "$OUT"
}

# render_br_transparent CANVAS SIZE HALF B_FILL R_FILL OUT
render_br_transparent() {
  local CANVAS=$1 SIZE=$2 HALF=$3 B_FILL=$4 R_FILL=$5 OUT=$6
  magick -size "${CANVAS}x${CANVAS}" xc:none \
    -font "$FONT" -pointsize "$SIZE" -gravity Center \
    -fill "$B_FILL" -annotate "-${HALF}+0" 'B' \
    -fill "$R_FILL" -annotate "+${HALF}+0" 'R' \
    "$OUT"
}

# At 480 pt NotoSans-Bold, each capital is ~320 px wide.
# Gap between inner edges: 60 px.  Inter-centre: 320 + 60 = 380 → HALF = 190.
render_br            1024 "$BG"  480 190 assets/icon.png

# Adaptive foreground (transparent, fits the 66% safe zone).
# 320 pt → letter ~215 px wide.  Gap 50 px → HALF = 132.
render_br_transparent 1024 320 132 "$WHITE" "$RED"   assets/android-icon-foreground.png
render_br_transparent 1024 320 132 "$WHITE" "$WHITE" assets/android-icon-monochrome.png

# Splash 512×512 — 240 pt → letter ~160 px wide.  Gap 36 px → HALF = 98.
render_br            512  "$BG"  240 98  assets/splash-icon.png

echo "✓ Icon assets generated in assets/"