#!/usr/bin/env node
/*
 Generates extension and toolbar PNG icons from the base SVG with transparent
 background and configurable stroke colors. Requires ImageMagick (`magick`).

 Theme defaults (aligned with project palette):
   Primary 2 (deep):  #223544 → add-on icon strokes (default)
   Primary 1 (light): #5AC3D6 → toolbar icon strokes (default)

 Override via environment variables (optional):
   ICON_COLOR_ADDON   – hex color for add-on icons (48/96/128). Default: #223544
   ICON_COLOR_TOOLBAR – hex color for toolbar icons (16/32).   Default: #5AC3D6

 Usage:
   node scripts/build-icons.js
*/
const fs = require('fs');
const path = require('path');
const { spawnSync } = require('child_process');

const REPO_ROOT = path.join(__dirname, '..');
const ICONS_DIR = path.join(REPO_ROOT, 'icons');
const SRC_SVG = path.join(ICONS_DIR, 'file-search.svg');

const ADDON_SIZES = [48, 96, 128];
const TOOLBAR_SIZES = [16, 32];

const COLOR_ADDON = process.env.ICON_COLOR_ADDON || '#223544';
const COLOR_TOOLBAR = process.env.ICON_COLOR_TOOLBAR || '#5AC3D6';

function ensureMagick() {
  // Prefer calling binaries directly to avoid shell init output polluting stdout.
  let ok = spawnSync('magick', ['-version']);
  if (ok && ok.status === 0) return 'magick';
  ok = spawnSync('convert', ['-version']);
  if (ok && ok.status === 0) return 'convert';
  return null;
}

function readSvg() {
  if (!fs.existsSync(SRC_SVG)) {
    console.error(`Base SVG not found: ${path.relative(REPO_ROOT, SRC_SVG)}`);
    process.exit(1);
  }
  return fs.readFileSync(SRC_SVG, 'utf8');
}

function colorize(svg, color) {
  // Replace currentColor with explicit hex color. Keep case-insensitive safety.
  return svg.replace(/currentColor/gi, color);
}

function rasterize(magickBin, svgString, size, outPath) {
  // Use ImageMagick, transparent background, high density for crisp vector rasterization.
  const args = ['-background', 'none', '-density', '384', 'svg:-', '-resize', `${size}x${size}`, outPath];
  const proc = spawnSync(magickBin, args, { input: svgString, stdio: ['pipe', 'inherit', 'inherit'] });
  if (proc.status !== 0) {
    console.error(`Failed to generate ${outPath}`);
    process.exit(proc.status || 1);
  }
}

function main() {
  const magick = ensureMagick();
  if (!magick) {
    console.error('ImageMagick not found. Please install it or adjust this script to use inkscape/rsvg-convert.');
    process.exit(1);
  }
  if (!fs.existsSync(ICONS_DIR)) fs.mkdirSync(ICONS_DIR, { recursive: true });

  const base = readSvg();

  // Add-on icons
  const addonSvg = colorize(base, COLOR_ADDON);
  for (const s of ADDON_SIZES) {
    const out = path.join(ICONS_DIR, `icon-${s}.png`);
    rasterize(magick, addonSvg, s, out);
    console.log(`Generated ${path.relative(REPO_ROOT, out)}`);
  }

  // Toolbar icons
  const toolbarSvg = colorize(base, COLOR_TOOLBAR);
  for (const s of TOOLBAR_SIZES) {
    const out = path.join(ICONS_DIR, `icon-${s}.png`);
    rasterize(magick, toolbarSvg, s, out);
    console.log(`Generated ${path.relative(REPO_ROOT, out)}`);
  }
}

main();