#!/usr/bin/env bash
# Generate web-ready brand assets and MIM4U-Brand-Kit.zip from sources in assets/brand-sources/.
# Requires: ImageMagick (convert). Run from repo root: ./scripts/brand/export-brand-assets.sh

set -euo pipefail
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
MIM_ROOT="$(cd "$SCRIPT_DIR/../.." && pwd)"
SRC="$MIM_ROOT/assets/brand-sources"
OUT="$MIM_ROOT/public/brand"
PUBLIC="$MIM_ROOT/public"

GREEN="#1a3c34"

if ! command -v convert >/dev/null 2>&1; then
  echo "Error: ImageMagick convert is required." >&2
  exit 1
fi

mkdir -p "$OUT"

symbol="$SRC/logo-symbol-source.png"
horizontal="$SRC/logo-horizontal-source.png"
square="$SRC/logo-square-source.png"

for f in "$symbol" "$horizontal" "$square"; do
  if [[ ! -f "$f" ]]; then
    echo "Missing source: $f" >&2
    exit 1
  fi
done

echo "Exporting symbol PNG sizes..."
for size in 64 128 256 512 1024; do
  convert "$symbol" -resize "${size}x${size}" -strip "$OUT/logo-symbol-${size}.png"
done
cp "$OUT/logo-symbol-512.png" "$OUT/logo-symbol.png"

echo "Exporting horizontal PNG/WebP..."
convert "$horizontal" -strip "$OUT/logo-horizontal.png"
convert "$horizontal" -quality 88 -define webp:method=6 "$OUT/logo-horizontal.webp"
convert "$horizontal" -resize 2048x -strip "$OUT/logo-horizontal-2x.png"

echo "Exporting nav-optimized transparent lockups..."
convert "$horizontal" -alpha set \
  -fuzz 18% -transparent "#1a3c34" \
  -fuzz 12% -transparent "#05382f" \
  -fuzz 8% -transparent "#0f2922" \
  PNG32:"$OUT/logo-horizontal-nav.png"
convert "$OUT/logo-horizontal-nav.png" -quality 88 -define webp:method=6 "$OUT/logo-horizontal-nav.webp"

convert "$symbol" -trim +repage -background none -resize 512x512\> PNG32:"$OUT/logo-symbol-nav.png"

echo "Tracing nav lockups to SVG (potrace)..."
node "$MIM_ROOT/scripts/brand/trace-nav-svg.mjs"

echo "Exporting square PNG/WebP..."
convert "$square" -strip "$OUT/logo-square.png"
convert "$square" -quality 88 -define webp:method=6 "$OUT/logo-square.webp"

echo "Exporting favicon / touch icons (symbol on brand green)..."
for size in 16 32 180 192 512; do
  convert "$symbol" -background "$GREEN" -gravity center -resize "${size}x${size}" -extent "${size}x${size}" -strip "$OUT/favicon-${size}.png"
done

# Multi-size favicon.ico
convert "$OUT/favicon-16.png" "$OUT/favicon-32.png" "$OUT/favicon.ico"

# Root copies for site + PWA
cp "$OUT/logo-horizontal.png" "$PUBLIC/logo-horizontal.png"
cp "$OUT/logo-square.png" "$PUBLIC/logo.png"
cp "$OUT/logo-symbol.png" "$PUBLIC/logo-symbol.png"
cp "$OUT/favicon-16.png" "$PUBLIC/favicon-16x16.png"
cp "$OUT/favicon-32.png" "$PUBLIC/favicon-32x32.png"
cp "$OUT/favicon-180.png" "$PUBLIC/apple-touch-icon.png"
cp "$OUT/favicon-192.png" "$PUBLIC/favicon-192x192.png"
cp "$OUT/favicon-512.png" "$PUBLIC/favicon-512x512.png"
cp "$OUT/favicon.ico" "$PUBLIC/favicon.ico"

echo "Generating OG social image (1200×630)..."
convert "$horizontal" -resize 1200x630^ -gravity center -extent 1200x630 -strip "$OUT/og-image.png"
cp "$OUT/og-image.png" "$PUBLIC/og-image.png" 2>/dev/null || cp "$OUT/og-image.png" "$PUBLIC/og-image.jpg" 2>/dev/null || true
if [[ -f "$PUBLIC/og-image.jpg" ]]; then
  convert "$OUT/og-image.png" -quality 90 "$PUBLIC/og-image.jpg"
fi

echo "Building brand kit ZIP..."
(
  cd "$OUT"
  rm -f MIM4U-Brand-Kit.zip
  zip -q MIM4U-Brand-Kit.zip \
    logo-symbol.svg logo-symbol-nav.svg \
    logo-symbol.png logo-symbol-64.png logo-symbol-128.png logo-symbol-256.png logo-symbol-512.png logo-symbol-1024.png \
    logo-horizontal.png logo-horizontal.webp logo-horizontal-2x.png \
    logo-horizontal-nav.svg logo-horizontal-nav.png logo-horizontal-nav.webp logo-symbol-nav.png \
    logo-square.png logo-square.webp \
    favicon.ico favicon-16.png favicon-32.png favicon-180.png favicon-192.png favicon-512.png \
    og-image.png \
    BRAND_GUIDELINES.md 2>/dev/null || true
)

echo "Done. Outputs: $OUT"