// src/engine.js
(function(global) {
    const { Hash, LocalStorage, State, _reactiveBridge, Util, $, $$ } = global;
    const { onNotifyUpdate } = _reactiveBridge;

    // --- Core Logic (from core.js) ---
    let _disableRunCodeError = false;
    const _fnCache = new Map();

    function setDisableRunCodeError(value) { _disableRunCodeError = value; }

    function _runCode(code, vars, thisObj, extendVars) {
        if (global.__DEBUG) console.log('DEBUG _runCode:', code, 'vars:', vars, 'extendVars:', extendVars);
        const argKeys = [...Object.keys(extendVars || {}), ...Object.keys(vars || {})];
        const argValues = [...Object.values(extendVars || {}), ...Object.values(vars || {})];
        const cacheKey = code + argKeys.join(',');
        try {
            let fn = _fnCache.get(cacheKey);
            if (!fn) {
                fn = new Function('Hash', 'LocalStorage', 'State', ...argKeys, code);
                _fnCache.set(cacheKey, fn);
            }
            return fn.apply(thisObj, [Hash, LocalStorage, State, ...argValues]);
        } catch (e) {
            if (!_disableRunCodeError) console.error(e, extendVars, [code, extendVars, vars, thisObj]);
            return null;
        }
    }

    function _returnCode(code, vars, thisObj, extendVars) {
        if (code.includes('${')) return _runCode('return `' + code + '`', vars, thisObj, extendVars);
        else return _runCode('return ' + code, vars, thisObj, extendVars);
    }

    // --- Component Logic (from component.js) ---
    const _components = new Map();
    const _pendingTemplates = [];

    const Component = {
        getTemplate: name => {
            const sel = `template[component="${name.toUpperCase()}"]`;
            const tpl = document.querySelector(sel);
            if (global.__DEBUG) console.log('DEBUG getTemplate:', name, 'selector:', sel, 'found:', !!tpl);
            return tpl;
        },
        register: (name, setupFunc, templateNode = null, ...globalNodes) => {
            if (global.__DEBUG) console.log('DEBUG Component.register:', name);
            _components.set(name.toUpperCase(), setupFunc);
            if (document.readyState !== 'loading') Component._addTemplate(name, templateNode, globalNodes);
            else _pendingTemplates.push([name, templateNode, globalNodes]);
        },
        exists: (name) => _components.has(name.toUpperCase()),
        getSetupFunction: (name) => _components.get(name.toUpperCase()),
        _addTemplate: (name, templateNode, globalNodes) => {
            if (templateNode) {
                const template = document.createElement('TEMPLATE');
                template.setAttribute('component', name.toUpperCase());
                template.content.appendChild(templateNode);
                document.head.appendChild(template);
                if (global.__DEBUG) console.log('DEBUG _addTemplate added to HEAD:', name.toUpperCase());
            }
            if (globalNodes) globalNodes.forEach(node => document.head.appendChild(node));
        },
        _initPending: () => {
            _pendingTemplates.forEach(([name, templateNode, globalNodes]) => Component._addTemplate(name, templateNode, globalNodes));
            _pendingTemplates.length = 0;
        }
    };

    function _mergeNode(from, to, scanObj, exists = {}) {
        if (global.__DEBUG) console.log('DEBUG _mergeNode from:', from.tagName, 'to:', to.tagName);
        if (from.attributes) {
            Array.from(from.attributes).forEach(attr => {
                if (attr.name === 'class') return;
                if (attr.name === 'style') {
                    if (to.hasAttribute('style')) to.setAttribute('style', `${attr.value}; ${to.getAttribute('style')}`);
                    else to.setAttribute('style', attr.value);
                } else if (!to.hasAttribute(attr.name)) {
                    to.setAttribute(attr.name, attr.value);
                }
            });
        }
        to.classList.add(...from.classList);
        const target = (to.tagName === 'TEMPLATE') ? to.content : to;
        const sourceNodes = (from.tagName === 'TEMPLATE') ? from.content.childNodes : from.childNodes;
        Array.from(sourceNodes).forEach(child => target.appendChild(child));
        if (from.tagName && Component.exists(from.tagName)) _makeComponent(from.tagName, to, scanObj, exists);
    }

    function _makeComponent(name, node, scanObj, exists = {}) {
        if (exists[name]) return;
        exists[name] = true;
        if (scanObj.thisObj) {
            Array.from(node.attributes).forEach(attr => {
                if ((attr.name.startsWith('$') || attr.name.startsWith('st-')) && attr.value.includes('this.')) {
                    attr.value = attr.value.replace(/\bthis\./g, 'this.parent.');
                }
            });
        }
        const componentFunc = Component.getSetupFunction(name);
        const slots = {};
        Array.from(node.childNodes).forEach(child => {
            if (child.nodeType === Node.ELEMENT_NODE && child.hasAttribute('slot')) {
                slots[child.getAttribute('slot')] = child;
                child.removeAttribute('slot');
            }
        });
        node.innerHTML = '';
        node.state = global.NewState(node.state || {});
        const template = Component.getTemplate(name);
        if (template) {
            const tplnode = template.content.cloneNode(true);
            if (tplnode.childNodes.length) {
                const rootNode = tplnode.children[0];
                if (rootNode) _mergeNode(rootNode, node, scanObj, exists);
                $$(node, '[slot-id]').forEach(placeholder => {
                    const slotName = placeholder.getAttribute('slot-id');
                    if (slots[slotName]) {
                        placeholder.removeAttribute('slot-id');
                        placeholder.innerHTML = '';
                        _mergeNode(slots[slotName], placeholder, scanObj, exists);
                    }
                });
            }
        }
        if (componentFunc) componentFunc(node);
    }

    // --- DOM Logic (from dom.js) ---
    let _translator = (text, args) => {
        if (!text || typeof text !== 'string') return text;
        return text.replace(/\{(.+?)\}/g, (match, key) => args.hasOwnProperty(key) ? args[key] : match);
    };
    const SetTranslator = (fn) => _translator = fn;

    const _translate = (text) => {
        if (!text || typeof text !== 'string' || !text.includes('{#')) return text;
        return text.replace(/\{#(.+?)#\}/g, (m, content) => {
            const parts = content.split('||').map(s => s.trim());
            const args = {};
            if (parts.length > 1) {
                const matches = parts[0].match(/\{(.+?)\}/g);
                if (matches) matches.forEach((match, i) => args[match.substring(1, match.length - 1)] = parts[i + 1] || '');
            }
            return _translator(parts[0], args);
        });
    };

    if (typeof document !== 'undefined') {
        try { document.createElement('div').setAttribute('$t', '1'); } catch (e) {
            const originalSetAttribute = Element.prototype.setAttribute;
            Element.prototype.setAttribute = function (name, value) {
                if (!name.startsWith('$')) return originalSetAttribute.call(this, name, value);
                return originalSetAttribute.call(this, 'st-' + name.substring(1), value);
            };
        }
    }

    onNotifyUpdate((binding) => _updateBinding(binding));

    function _clearRenderedNodes(node) {
        if (node._renderedNodes) node._renderedNodes.forEach(nodes => nodes.forEach(child => {
            child.remove();
            if (child._renderedNodes) _clearRenderedNodes(child);
        }));
    }

    function _updateBinding(binding) {
        const node = binding.node;
        if (!node.isConnected && node.tagName !== 'TEMPLATE') return;

        _reactiveBridge.activeBinding = binding;
        let result = binding.exp ? (binding.tpl ? _returnCode(binding.tpl, { thisNode: node }, node._thisObj || node, node._ref || {}) : null) : binding.tpl;
        if (binding.exp === 2 && typeof result === 'string') {
            try { result = _returnCode(result, { thisNode: node }, node._thisObj || node, node._ref || {}); } catch (e) { }
        }
        _reactiveBridge.activeBinding = null;

        if (binding.prop) {
            const prop = binding.prop;
            let o = node;
            for (let i = 0; i < prop.length - 1; i++) {
                if (!prop[i]) continue;
                if (o[prop[i]] == null) o[prop[i]] = {};
                o = o[prop[i]];
                if (typeof o !== 'object') break;
            }
            if (typeof o === 'object' && o !== null) {
                const lk = prop[prop.length - 1];
                if (lk) {
                    if (typeof result === 'object' && result != null && !Array.isArray(result) && o[lk] == null) o[lk] = {};
                    const lo = o[lk];
                    if (typeof lo === 'object' && lo != null && lo.__watch) Object.assign(lo, result);
                    else { if (o[lk] !== result) o[lk] = result; }
                } else if (typeof result === 'object' && result != null && !Array.isArray(result)) {
                    Object.assign(o, result);
                }
            }
        } else if (binding.attr) {
            const attr = binding.attr;
            if (attr === 'if') {
                if (result) {
                    if (!node._renderedNodes || node._renderedNodes.length === 0) {
                        node._children.forEach(child => {
                            node.parentNode.insertBefore(child, node);
                            child._ref = { ...node._ref };
                            child._thisObj = node._thisObj;
                        });
                        node._renderedNodes = [node._children];
                    }
                } else {
                    _clearRenderedNodes(node);
                    node._renderedNodes = [];
                }
            } else if (attr === 'each') {
                if (result && typeof result === 'object') {
                    const asName = node.getAttribute('as') || 'item';
                    const indexName = node.getAttribute('index') || 'index';
                    const keyName = node.getAttribute('key');
                    let keys, getVal;
                    if (result instanceof Map) {
                        keys = Array.from(result.keys()); getVal = k => result.get(k);
                    } else if (typeof result[Symbol.iterator] === 'function') {
                        const arr = Array.isArray(result) ? result : Array.from(result);
                        keys = new Array(arr.length);
                        for (let i = 0; i < arr.length; i++) keys[i] = i;
                        getVal = k => arr[k];
                    } else {
                        keys = Object.keys(result); getVal = k => result[k];
                    }

                    if (!node._keyedNodes) node._keyedNodes = new Map();
                    const newKeyedNodes = new Map();
                    const currentRenderedNodes = [];

                    keys.forEach((k, i) => {
                        const item = getVal(k);
                        const rawKey = keyName ? (item && typeof item === 'object' ? item[keyName] : item) : k;
                        const keyVal = (rawKey === undefined || rawKey === null || newKeyedNodes.has(rawKey)) ? `st_key_${i}` : rawKey;
                        let existingNodes = node._keyedNodes.get(keyVal);
                        if (existingNodes) {
                            node._keyedNodes.delete(keyVal);
                            existingNodes.forEach(child => {
                                child._ref[indexName] = k;
                                child._ref[asName] = item;
                                _scanTree(child);
                            });
                        } else {
                            existingNodes = [];
                            node._children.forEach(child => {
                                const cloned = child.cloneNode(true);
                                cloned._ref = { ...node._ref, [indexName]: k, [asName]: item };
                                cloned._thisObj = node._thisObj;
                                node.parentNode.insertBefore(cloned, node);
                                existingNodes.push(cloned);
                            });
                        }
                        newKeyedNodes.set(keyVal, existingNodes);
                        currentRenderedNodes.push(existingNodes);
                    });
                    node._keyedNodes.forEach(nodes => nodes.forEach(child => { _clearRenderedNodes(child); child.remove(); }));
                    node._keyedNodes = newKeyedNodes;
                    node._renderedNodes = currentRenderedNodes;
                } else {
                    _clearRenderedNodes(node);
                    node._renderedNodes = [];
                }
            } else if (attr === 'bind') {
                if (['INPUT', 'SELECT', 'TEXTAREA'].includes(node.tagName) && !node.hasAttribute('autocomplete')) node.setAttribute('autocomplete', 'off');
                if (node.type === 'checkbox') {
                    if (node.value !== 'on' && !result) { _runCode(`${binding.tpl} = []`, { thisNode: node }, node._thisObj || node, node._ref || {}); result = []; }
                    node._checkboxMultiMode = result instanceof Array;
                    const isChecked = result instanceof Array ? result.includes(node.value) : !!result;
                    if (node.checked !== isChecked) node.checked = isChecked;
                } else if (node.type === 'radio') {
                    if (node.checked !== (node.value === String(result ?? ''))) node.checked = (node.value === String(result ?? ''));
                } else if ('value' in node && node.type !== 'file') {
                    Promise.resolve().then(() => { if (node.value !== String(result ?? '')) node.value = result; });
                } else if (node.isContentEditable) {
                    if (node.innerHTML !== String(result ?? '')) node.innerHTML = result;
                }
                node.dispatchEvent(new CustomEvent('bind', { bubbles: false, detail: result }));
            } else {
                if (['checked', 'disabled', 'readonly'].includes(attr)) result = !!result;
                if (typeof result === 'boolean') result ? node.setAttribute(attr, '') : node.removeAttribute(attr);
                else if (result !== undefined) {
                    if (typeof result !== 'string') result = JSON.stringify(result);
                    if (attr === 'text') node.textContent = result ?? '';
                    else if (attr === 'html') node.innerHTML = result ?? '';
                    else if (attr === 'class') {
                        if (node._staticClass === undefined) node._staticClass = node.className;
                        node.className = (node._staticClass ? node._staticClass + ' ' : '') + (result || '');
                    } else if (attr === 'style') {
                        if (node._staticStyle === undefined) node._staticStyle = node.getAttribute('style') || '';
                        node.setAttribute('style', (node._staticStyle ? node._staticStyle + '; ' : '') + (result || ''));
                    }
                    else if (node.tagName === 'IMG' && attr === 'src' && result.includes('.svg')) node.setAttribute('_src', result ?? '');
                    else node.setAttribute(attr, result ?? '');
                }
            }
        }
    }

    function _initBinding(binding) {
        if (!binding.node._bindings) binding.node._bindings = [];
        binding.node._bindings.push({ attr: binding.attr, prop: binding.prop, tpl: binding.tpl, exp: binding.exp });
        _updateBinding(binding);
    }

    function _parseNode(node, scanObj) {
        if (node._bindings) {
            node._states = new Set();
            node._bindings.forEach(b => _updateBinding({ node, ...b }));
            if (node._hasOnUpdate) node.dispatchEvent(new Event('update', { bubbles: false }));
            return;
        }
        if (Component.exists(node.tagName) && !node._componentInitialized) {
            Array.from(node.attributes).forEach(attr => {
                if (attr.name.startsWith('$.')) {
                    const realAttrName = attr.name.slice(2);
                    let tpl = _translate(attr.value);
                    if (tpl.includes('this.')) tpl = tpl.replace(/\bthis\./g, 'this.parent.');
                    const result = _returnCode(tpl, { thisNode: node }, { parent: scanObj.thisObj || node }, node._ref || {});
                    let o = node;
                    const prop = realAttrName.split('.');
                    for (let i = 0; i < prop.length - 1; i++) { if (prop[i]) o = (o[prop[i]] ??= {}); }
                    o[prop[prop.length - 1]] = result;
                    node.removeAttribute(attr.name);
                }
            });
            _makeComponent(node.tagName, node, scanObj);
            $$(node, '[slot-id]').forEach(p => p.removeAttribute('slot-id'));
            node._componentInitialized = true;
            if (!node._thisObj) node._thisObj = node;
        }
        if (node.tagName === 'TEMPLATE') {
            node._children = [...node.content.childNodes];
            if (!node._renderedNodes) node._renderedNodes = [];
        }
        let attrs = [];
        if (node.tagName === 'TEMPLATE') {
            ['$if', '$each', 'st-if', 'st-each', '$$if', '$$each', 'st-st-if', 'st-st-each'].forEach(n => node.hasAttribute(n) && attrs.push(node.getAttributeNode(n)));
        } else {
            attrs = Array.from(node.attributes).filter(a => (a.name.startsWith('$') || a.name.startsWith('st-')) && !['$if', '$each', 'st-if', 'st-each', '$$if', '$$each', 'st-st-if', 'st-st-each'].includes(a.name) || a.name.includes('.'));
        }
        if (node._thisObj && scanObj.thisObj) node._thisObj.parent = scanObj.thisObj;
        if (!node._thisObj) node._thisObj = scanObj.thisObj || null;
        if (!node._ref) node._ref = scanObj.extendVars || {};
        node._states = new Set();
        attrs.forEach(attr => {
            let exp = 0;
            if (attr.name.startsWith('$$') || attr.name.startsWith('st-st-')) exp = 2;
            else if (attr.name.startsWith('$') || attr.name.startsWith('st-')) exp = 1;
            const realAttrName = exp === 2 ? (attr.name.startsWith('$$') ? attr.name.slice(2) : attr.name.slice(6)) : (exp === 1 ? (attr.name.startsWith('$') ? attr.name.slice(1) : attr.name.slice(3)) : attr.name);
            let tpl = attr.value;
            node.removeAttribute(attr.name);
            if (realAttrName.startsWith('.')) _initBinding({ node, prop: realAttrName.split('.'), tpl, exp });
            else if (realAttrName.startsWith('on')) {
                const eventName = realAttrName.slice(2);
                if (eventName === 'update') node._hasOnUpdate = true;
                if (eventName === 'load' && !['BODY', 'IMG', 'IFRAME'].includes(node.tagName)) node._hasOnLoad = true;
                if (eventName === 'unload' && !['BODY', 'IMG', 'IFRAME'].includes(node.tagName)) node._hasOnUnload = true;
                node.addEventListener(eventName, (e) => _runCode(tpl, { event: e, thisNode: node, ...(e.detail || {}) }, scanObj.thisObj || node, node._ref || {}));
            } else {
                if (realAttrName === 'bind') {
                    node.addEventListener(['textarea', 'text', 'password'].includes(node.type || 'text') || node.isContentEditable ? 'input' : 'change', (e) => {
                        let newVal = node.isContentEditable ? e.target.innerHTML : (node.type === 'checkbox' ? e.target.checked : e.target.files || e.target.value || e.detail);
                        _reactiveBridge.noWriteBack = node; setDisableRunCodeError(true);
                        if (node.type === 'checkbox' && node._checkboxMultiMode) _runCode(`!!checked ? (!${tpl}.includes(val) && ${tpl}.push(val)) : (index = ${tpl}.indexOf(val), index > -1 && ${tpl}.splice(index, 1))`, { val: node.value, checked: newVal, thisNode: node }, scanObj.thisObj || node, node._ref || {});
                        else _runCode(`${tpl} = val`, { val: newVal, thisNode: node }, scanObj.thisObj || node, node._ref || {});
                        setDisableRunCodeError(false); _reactiveBridge.noWriteBack = null;
                    });
                } else if (realAttrName === 'text' && !tpl) { tpl = node.textContent; node.textContent = ''; }
                if (tpl) { tpl = _translate(tpl); _initBinding({ node, attr: realAttrName, tpl, exp }); }
            }
        });
        if (node._hasOnLoad || node._componentInitialized) Promise.resolve().then(() => node.dispatchEvent(new Event('load', { bubbles: false })));
        if (node._hasOnUpdate) node.dispatchEvent(new Event('update', { bubbles: false }));
        if (node._thisObj) scanObj.thisObj = node._thisObj;
    }

    function _scanTree(node, scanObj = {}) {
        if (node.nodeType === 3) {
            if (node._stTranslated) return;
            const translated = _translate(node.textContent);
            if (translated !== node.textContent) node.textContent = translated;
            node._stTranslated = true; return;
        }
        if (node.nodeType !== 1) return;
        if (!node._stTranslated) {
            Array.from(node.attributes).forEach(attr => {
                if (!attr.name.startsWith('$') && !attr.name.startsWith('st-') && !attr.name.startsWith('.')) {
                    const translated = _translate(attr.value);
                    if (translated !== attr.value) attr.value = translated;
                }
            });
            node._stTranslated = true;
        }
        if (node.tagName !== 'TEMPLATE' && (node.hasAttribute('$if') || node.hasAttribute('$each') || node.hasAttribute('st-if') || node.hasAttribute('st-each') || node.hasAttribute('$$if') || node.hasAttribute('$$each') || node.hasAttribute('st-st-if') || node.hasAttribute('st-st-each'))) {
            const template = document.createElement('TEMPLATE');
            const attrs = Array.from(node.attributes).filter(attr => ['$if', '$each', 'st-if', 'st-each', '$$if', '$$each', 'st-st-if', 'st-st-each'].includes(attr.name) || ((node.hasAttribute('$each') || node.hasAttribute('st-each') || node.hasAttribute('$$each') || node.hasAttribute('st-st-each')) && ['as', 'index', 'key'].includes(attr.name)));
            attrs.forEach(attr => { template.setAttribute(attr.name, attr.value); node.removeAttribute(attr.name); });
            node.parentNode.insertBefore(template, node);
            template.content.appendChild(node);
            template._ref = node._ref;
            return;
        }
        if (node.tagName === 'TEMPLATE' && (node.hasAttribute('$if') || node.hasAttribute('st-if') || node.hasAttribute('$$if') || node.hasAttribute('st-st-if')) && (node.hasAttribute('$each') || node.hasAttribute('st-each') || node.hasAttribute('$$each') || node.hasAttribute('st-st-each'))) {
            const template = document.createElement('TEMPLATE');
            const attrs = Array.from(node.attributes).filter(attr => ['$if', '$each', 'st-if', 'st-each', '$$if', '$$each', 'st-st-if', 'st-st-each'].includes(attr.name));
            const attr = attrs[attrs.length - 1];
            template.setAttribute(attr.name, attr.value);
            node.removeAttribute(attr.name);
            if (['$each', 'st-each', '$$each', 'st-st-each'].includes(attr.name)) {
                Array.from(node.attributes).filter(attr => ['as', 'index', 'key'].includes(attr.name)).forEach(attr => { template.setAttribute(attr.name, attr.value); node.removeAttribute(attr.name); });
            }
            Array.from(node.content.childNodes).forEach(child => template.content.appendChild(child));
            node.content.appendChild(template);
            template._ref = node._ref;
        }
        if (node.tagName === 'IMG' && (node.hasAttribute('src') || node.hasAttribute('_src') || node.hasAttribute('$src'))) {
            const imgNode = node;
            Promise.resolve().then(() => {
                const url = imgNode.getAttribute('_src') || imgNode.getAttribute('src');
                if (url) fetch(url, { cache: 'force-cache' }).then(r => r.text()).then(svgText => {
                    const realSvg = new DOMParser().parseFromString(svgText, "image/svg+xml").querySelector('svg');
                    if (realSvg) {
                        Array.from(imgNode.attributes).forEach(attr => realSvg.setAttribute(attr.name, attr.value));
                        imgNode.replaceWith(realSvg);
                    }
                });
            });
        }
        if (node._thisObj !== undefined) scanObj.thisObj = node._thisObj || null;
        else {
            let curr = node;
            while (curr && curr._thisObj === undefined) curr = curr.parentNode;
            scanObj.thisObj = curr ? curr._thisObj : null;
        }
        if (node._ref === undefined) {
            let curr = node;
            while (curr && curr._ref === undefined) curr = curr.parentNode;
            node._ref = curr ? { ...curr._ref } : {};
        }
        if (node._refExt !== undefined) { Object.assign(node._ref, node._refExt); }
        if (scanObj.extendVars) Object.assign(node._ref, scanObj.extendVars);
        _parseNode(node, { ...scanObj });
        const nodes = [...(node.childNodes || [])];
        nodes.forEach(child => _scanTree(child, { thisObj: scanObj.thisObj, extendVars: { ...node._ref } }));
    }

    function _unbindTree(node) {
        if (node.nodeType !== 1) return;
        if (node._hasOnUnload) node.dispatchEvent(new Event('unload', { bubbles: false }));
        if (node._states) node._states.forEach(mappings => {
            for (const [key, bindingSet] of mappings) {
                for (const binding of bindingSet) { if (binding.node === node) bindingSet.delete(binding); }
            }
        });
        node.childNodes && node.childNodes.forEach(child => _unbindTree(child));
    }

    // --- Bootloader (from index.js) ---
    if (typeof document !== 'undefined') {
        const init = () => {
            Component._initPending();
            const htmlNode = document.documentElement;
            if (!htmlNode.hasAttribute('$data-bs-theme') && !htmlNode.hasAttribute('data-bs-theme')) {
                htmlNode.setAttribute('$data-bs-theme', "LocalStorage.darkMode?'dark':'light'");
            }
            new MutationObserver(mutations => {
                mutations.forEach(mutation => {
                    mutation.addedNodes.forEach(newNode => { if (newNode.isConnected) _scanTree(newNode); });
                    mutation.removedNodes.forEach(oldNode => { _unbindTree(oldNode); });
                });
            }).observe(document.documentElement, { childList: true, subtree: true });
            _scanTree(document.documentElement);
        };
        if (document.readyState !== 'loading') init();
        else document.addEventListener('DOMContentLoaded', init, true);
    }

    global.Component = Component;
    global.SetTranslator = SetTranslator;
    global._runCode = _runCode;
    global._returnCode = _returnCode;
    global._scanTree = _scanTree;
    global._unbindTree = _unbindTree;
    global._unsafeRefreshState = _scanTree;
    global.RefreshState = _scanTree;

})(globalThis);