(function (global) {
    'use strict';
    var WorkbenchLayout = global.PWLayout;
    if (!WorkbenchLayout) {
        console.error('[调试工作台] layout-render 需先加载 layout-core');
        return;
    }
    var PANEL_TITLES = {
        hierarchy: '层级',
        inspector: '属性',
        assets: '资源',
        perf: '性能',
        console: '控制台',
    };
    var SPLIT_SIZE = 4;

    WorkbenchLayout.prototype._renderNode = function (node) {
        if (!node) return null;
        if (node.type === 'split') return this._renderSplit(node);
        if (node.type === 'game') return this._renderGame(node);
        return this._renderTabs(node);
    };

    WorkbenchLayout.prototype._renderSplit = function (node) {
        var self = this;
        this._ensureId(node);
        var wrap = document.createElement('div');
        wrap.className = 'pw-split-node pw-split-dir-' + (node.dir === 'v' ? 'v' : 'h');
        wrap.setAttribute('data-node-id', node.id);
        this._nodeEls[node.id] = { el: wrap, node: node };
        var kids = node.children || [];
        var sizes = node.sizes || [];
        this._normalizeSizes(sizes, kids.length);

        for (var i = 0; i < kids.length; i++) {
            if (i > 0) {
                (function (index) {
                    var splitter = document.createElement('div');
                    splitter.className = 'pw-splitter ' + (node.dir === 'v' ? 'pw-splitter-v' : 'pw-splitter-h');
                    splitter.addEventListener('pointerdown', function (ev) {
                        self._beginSplitDrag(ev, node, wrap, index - 1);
                    });
                    wrap.appendChild(splitter);
                })(i);
            }
            var childWrap = document.createElement('div');
            childWrap.className = 'pw-split-child';
            childWrap.style.flex = String(sizes[i]) + ' 1 0';
            childWrap.style.minWidth = '0';
            childWrap.style.minHeight = '0';
            var childEl = this._renderNode(kids[i]);
            if (childEl) childWrap.appendChild(childEl);
            wrap.appendChild(childWrap);
        }
        return wrap;
    };

    WorkbenchLayout.prototype._normalizeSizes = function (sizes, n) {
        while (sizes.length < n) sizes.push(1 / n);
        sizes.length = n;
        var sum = 0;
        for (var i = 0; i < n; i++) sum += sizes[i] || 0;
        if (sum <= 0) {
            for (var j = 0; j < n; j++) sizes[j] = 1 / n;
            return;
        }
        for (var k = 0; k < n; k++) sizes[k] = sizes[k] / sum;
    };

    WorkbenchLayout.prototype._beginSplitDrag = function (ev, node, wrap, leftIndex) {
        ev.preventDefault();
        ev.stopPropagation();
        var children = [];
        for (var i = 0; i < wrap.children.length; i++) {
            if (wrap.children[i].classList.contains('pw-split-child')) children.push(wrap.children[i]);
        }
        if (leftIndex < 0 || leftIndex >= children.length - 1) return;
        var a = children[leftIndex];
        var b = children[leftIndex + 1];
        this._splitDrag = {
            node: node,
            dir: node.dir,
            leftIndex: leftIndex,
            startPos: node.dir === 'h' ? ev.clientX : ev.clientY,
            a0: node.dir === 'h' ? a.getBoundingClientRect().width : a.getBoundingClientRect().height,
            b0: node.dir === 'h' ? b.getBoundingClientRect().width : b.getBoundingClientRect().height,
            aEl: a,
            bEl: b,
        };
        var prevCursor = document.body.style.cursor;
        document.body.style.cursor = node.dir === 'h' ? 'col-resize' : 'row-resize';
        document.body.classList.add('pw-split-dragging');
        // iframe 会吞掉 pointermove；拖动期间禁用命中
        this._setGameIframePassThrough(true);
        var target = ev.currentTarget || ev.target;
        if (target && target.setPointerCapture && ev.pointerId != null) {
            try { target.setPointerCapture(ev.pointerId); } catch (e) { /* */ }
        }
        var self = this;
        var move = function (e) { self._onSplitMove(e); };
        var up = function (e) {
            window.removeEventListener('pointermove', move);
            window.removeEventListener('pointerup', up);
            window.removeEventListener('pointercancel', up);
            if (target && target.releasePointerCapture && e && e.pointerId != null) {
                try { target.releasePointerCapture(e.pointerId); } catch (err) { /* */ }
            }
            document.body.style.cursor = prevCursor || '';
            document.body.classList.remove('pw-split-dragging');
            self._setGameIframePassThrough(false);
            self._splitDrag = null;
            self._dirty = true;
            self._save();
            self._syncGameHostGeom();
            self._notifyViewResize();
        };
        window.addEventListener('pointermove', move);
        window.addEventListener('pointerup', up);
        window.addEventListener('pointercancel', up);
    };

    /** @param {boolean} on */
    WorkbenchLayout.prototype._setGameIframePassThrough = function (on) {
        var iframe = document.getElementById('pw-game-iframe');
        if (iframe) iframe.style.pointerEvents = on ? 'none' : '';
        var host = this.gameHost;
        if (host) host.classList.toggle('pw-iframe-passthrough', !!on);
    };

    WorkbenchLayout.prototype._onSplitMove = function (ev) {
        var d = this._splitDrag;
        if (!d) return;
        var delta = (d.dir === 'h' ? ev.clientX : ev.clientY) - d.startPos;
        var total = d.a0 + d.b0;
        if (total <= 1) return;
        var a1 = Math.max(80, Math.min(total - 80, d.a0 + delta));
        var b1 = total - a1;
        var ra = a1 / total;
        var rb = b1 / total;
        var baseA = d.node.sizes[d.leftIndex];
        var baseB = d.node.sizes[d.leftIndex + 1];
        var pair = baseA + baseB;
        d.node.sizes[d.leftIndex] = pair * ra;
        d.node.sizes[d.leftIndex + 1] = pair * rb;
        d.aEl.style.flex = d.node.sizes[d.leftIndex] + ' 1 0';
        d.bEl.style.flex = d.node.sizes[d.leftIndex + 1] + ' 1 0';
        this._syncGameHostGeom();
    };

    WorkbenchLayout.prototype._renderGame = function (node) {
        this._ensureId(node);
        var leaf = document.createElement('div');
        leaf.className = 'pw-leaf pw-leaf-game';
        leaf.setAttribute('data-leaf-id', node.id);
        leaf.setAttribute('data-node-id', node.id);
        this._leafEls[node.id] = { el: leaf, node: node };
        this._nodeEls[node.id] = { el: leaf, node: node };
        var ph = document.createElement('div');
        ph.className = 'pw-game-placeholder';
        ph.setAttribute('data-game-placeholder', '1');
        leaf.appendChild(ph);
        this._gamePlaceholder = ph;
        return leaf;
    };

    WorkbenchLayout.prototype._renderTabs = function (node) {
        var self = this;
        this._ensureId(node);
        var leaf = document.createElement('div');
        leaf.className = 'pw-leaf pw-leaf-tabs';
        leaf.setAttribute('data-leaf-id', node.id);
        leaf.setAttribute('data-node-id', node.id);
        this._leafEls[node.id] = { el: leaf, node: node };
        this._nodeEls[node.id] = { el: leaf, node: node };

        var tabs = document.createElement('div');
        tabs.className = 'pw-leaf-tabbar';
        tabs.setAttribute('data-leaf-id', node.id);

        var body = document.createElement('div');
        body.className = 'pw-leaf-body';
        body.setAttribute('data-leaf-id', node.id);

        var panels = node.panels || [];
        if (!panels.length) {
            leaf.appendChild(tabs);
            leaf.appendChild(body);
            return leaf;
        }
        if (panels.indexOf(node.active) < 0) node.active = panels[0];

        for (var i = 0; i < panels.length; i++) {
            (function (pid) {
                var tab = document.createElement('button');
                tab.type = 'button';
                tab.className = 'pw-leaf-tab' + (pid === node.active ? ' active' : '');
                tab.textContent = PANEL_TITLES[pid] || pid;
                tab.setAttribute('data-panel', pid);
                tab.draggable = true;
                tab.addEventListener('click', function (ev) {
                    ev.preventDefault();
                    if (node.active === pid) return;
                    node.active = pid;
                    // 仅切换页签内容，禁止 rebuild（会搬移/重排导致 iframe 重载）
                    self._activateTabLeaf(leaf, tabs, body, node);
                    self._save();
                    self._emitVisibility();
                });
                tab.addEventListener('dragstart', function (ev) {
                    self._beginDrag(pid, ev);
                });
                tabs.appendChild(tab);
            })(panels[i]);
        }

        var activeEl = this._panelBodies[node.active];
        if (activeEl) body.appendChild(activeEl);

        leaf.appendChild(tabs);
        leaf.appendChild(body);
        return leaf;
    };

    /**
     * 就地切换页签，不重建停靠树。
     * @param {HTMLElement} leaf
     * @param {HTMLElement} tabs
     * @param {HTMLElement} body
     * @param {object} node
     */
    WorkbenchLayout.prototype._activateTabLeaf = function (leaf, tabs, body, node) {
        var buttons = tabs.querySelectorAll('.pw-leaf-tab');
        for (var i = 0; i < buttons.length; i++) {
            var b = buttons[i];
            b.classList.toggle('active', b.getAttribute('data-panel') === node.active);
        }
        while (body.firstChild) body.removeChild(body.firstChild);
        var el = this._panelBodies[node.active];
        if (el) body.appendChild(el);
    };

})(window);