// pangu.js - Auto insert spaces between CJK and half-width characters
(function() {
    // CJK Unified Ideographs + common ranges
    var CJK = '⺀-⻿⼀-⿟぀-ゟ゠-ヿ㄀-ㄯ㈀-㋿㐀-䶿一-鿿豈-﫿︰-﹏＀-￯';
    var CJK_RE = new RegExp('([' + CJK + '])', 'g');

    // Insert space between CJK and half-width (letters, digits, symbols)
    function panguText(text) {
        // CJK followed by half-width
        text = text.replace(new RegExp('([' + CJK + '])([a-zA-Z0-9@#$%&=+<>|\\\\])', 'g'), '$1 $2');
        // Half-width followed by CJK
        text = text.replace(new RegExp('([a-zA-Z0-9@#$%&=+<>|\\\\])([' + CJK + '])', 'g'), '$1 $2');
        return text;
    }

    function panguNode(root) {
        var walker = document.createTreeWalker(root, NodeFilter.SHOW_TEXT, null, false);
        var nodes = [];
        while (walker.nextNode()) {
            var node = walker.currentNode;
            // Skip code, pre, script, style, input
            if (node.parentElement && node.parentElement.closest('code, pre, script, style, input, textarea')) continue;
            if (node.textContent.length > 1) nodes.push(node);
        }
        nodes.forEach(function(node) {
            var spaced = panguText(node.textContent);
            if (spaced !== node.textContent) node.textContent = spaced;
        });
    }

    function run() {
        var content = document.querySelector('.post-content');
        if (content) panguNode(content);
    }

    window.initPangu = run;

    if (document.readyState === 'loading') {
        document.addEventListener('DOMContentLoaded', run);
    } else {
        run();
    }
})();