<template>
  <div class="kole-qrcode">
    <svg :width="size" :height="size" :viewBox="'0 0 ' + size + ' ' + size" :fill="color">
      <rect v-for="(rc, i) in cells" :key="i" :x="rc.x" :y="rc.y" :width="cell" :height="cell" />
    </svg>
    <div class="kole-qrcode-text" v-if="showText">{{ value }}</div>
  </div>
</template>

<script setup>
import { ref, computed } from 'vue';
const props = defineProps({
  value: { type: String, default: '' }, size: { type: Number, default: 200 },
  color: { type: String, default: '#1F2329' }, showText: { type: Boolean, default: true }
});
const n = 25;
const cell = ref(props.size / n);

function matrix(value, n) {
  let seed = 0; for (let i = 0; i < value.length; i++) seed = (seed * 31 + value.charCodeAt(i)) >>> 0;
  const rnd = () => { seed = (seed * 1103515245 + 12345) >>> 0; return seed / 4294967296; };
  const m = []; for (let r = 0; r < n; r++) m.push(new Array(n).fill(false));
  for (let r = 0; r < n; r++) for (let c = 0; c < n; c++) if (rnd() > 0.5) m[r][c] = true;
  const place = (r0, c0) => {
    for (let r = 0; r < 7; r++) for (let c = 0; c < 7; c++) {
      const edge = r === 0 || r === 6 || c === 0 || c === 6, inner = r >= 2 && r <= 4 && c >= 2 && c <= 4;
      m[r0 + r][c0 + c] = edge || inner;
    }
    for (let rr = -1; rr < 8; rr++) for (let cc = -1; cc < 8; cc++) {
      const y = r0 + rr, x = c0 + cc; if (y >= 0 && y < n && x >= 0 && x < n) { if (rr < 0 || rr === 7 || cc < 0 || cc === 7) m[y][x] = false; }
    }
  };
  place(0, 0); place(0, n - 7); place(n - 7, 0);
  return m;
}
const cells = computed(() => {
  const m = matrix(props.value, n), out = [];
  for (let r = 0; r < n; r++) for (let c = 0; c < n; c++) if (m[r][c]) out.push({ x: c * cell.value, y: r * cell.value });
  return out;
});
</script>

<style src="./QRCode.css"></style>
