#!/usr/bin/env bash
# Convert assets/svg/cloud.svg to XBM C headers in src/bitmaps/
# Requires: rsvg-convert, magick (ImageMagick 7)
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
PROJECT_DIR="$(dirname "$SCRIPT_DIR")"
SVG="$PROJECT_DIR/assets/svg/cloud.svg"
OUT_DIR="$PROJECT_DIR/src/bitmaps"

mkdir -p "$OUT_DIR"

convert_cloud() {
  local W="$1" H="$2" VARNAME="$3" OUTFILE="$4"
  local TMP_PNG TMP_XBM
  TMP_PNG=$(mktemp /tmp/cloud_XXXXXX.png)
  TMP_XBM=$(mktemp /tmp/cloud_XXXXXX.xbm)

  # SVG → PNG (rsvg-convert scales, magick flattens on white + thresholds to 1-bit)
  rsvg-convert -w "$W" -h "$H" "$SVG" \
    | magick - -background white -flatten -threshold 50% "$TMP_PNG"

  # PNG → XBM
  magick "$TMP_PNG" "$TMP_XBM"

  # XBM → C header via Python (handles edge cases in XBM formatting)
  python3 - "$TMP_XBM" "$W" "$H" "$VARNAME" "$OUT_DIR/$OUTFILE" <<'PYEOF'
import sys, re

xbm_file, W, H, varname, outfile = sys.argv[1:]
W, H = int(W), int(H)

with open(xbm_file) as f:
    content = f.read()

# Remove #define lines
content = re.sub(r'#define\s+\S+\s+\d+\n?', '', content)
# Replace "static char NAME[] =" with our typed array
content = re.sub(r'static\s+char\s+\S+\s*=', f'static const uint8_t {varname}_XBM[] =', content)
content = content.strip()

header = f"""#pragma once
#include <stdint.h>
// W={W}, H={H} -- generated from assets/svg/cloud.svg
#define {varname}_W {W}
#define {varname}_H {H}
{content}
"""
with open(outfile, 'w') as f:
    f.write(header)
print(f"[svg_to_xbm] Generated {outfile} ({W}x{H})")
PYEOF

  rm -f "$TMP_PNG" "$TMP_XBM"
}

convert_cloud 26 17 "CLOUD"       "cloud_xbm.h"
convert_cloud 20 13 "CLOUD_SMALL" "cloud_small_xbm.h"

# Alert icon (circle with !) — rendered as both eyes for MOOD_ALERT
convert_svg() {
  local SVG_SRC="$1" W="$2" H="$3" VARNAME="$4" OUTFILE="$5"
  local TMP_PNG TMP_XBM
  TMP_PNG=$(mktemp /tmp/icon_XXXXXX.png)
  TMP_XBM=$(mktemp /tmp/icon_XXXXXX.xbm)

  rsvg-convert -w "$W" -h "$H" "$SVG_SRC" \
    | magick - -background white -flatten -threshold 50% "$TMP_PNG"
  magick "$TMP_PNG" "$TMP_XBM"

  python3 - "$TMP_XBM" "$W" "$H" "$VARNAME" "$OUT_DIR/$OUTFILE" "$SVG_SRC" <<'PYEOF'
import sys, re
xbm_file, W, H, varname, outfile, src = sys.argv[1:]
W, H = int(W), int(H)
with open(xbm_file) as f:
    content = f.read()
content = re.sub(r'#define\s+\S+\s+\d+\n?', '', content)
content = re.sub(r'static\s+char\s+\S+\s*=', f'static const uint8_t {varname}_XBM[] =', content)
import os
header = f"""#pragma once
#include <stdint.h>
// W={W}, H={H} -- generated from {os.path.basename(src)}
#define {varname}_W {W}
#define {varname}_H {H}
{content.strip()}
"""
with open(outfile, 'w') as f:
    f.write(header)
print(f"[svg_to_xbm] Generated {outfile} ({W}x{H})")
PYEOF

  rm -f "$TMP_PNG" "$TMP_XBM"
}

convert_svg "$PROJECT_DIR/assets/svg/alert.svg" 26 26 "ALERT" "alert_xbm.h"

echo "[svg_to_xbm] Done."