(function (global) {
    'use strict';

    var WorkbenchAgent = global.PWAgent;
    var U = global.PWAgentUtil;
    var nodeId = U && U.nodeId;
    var walk = U && U.walk;
    if (!WorkbenchAgent) {
        console.error('[调试工作台] agent-pick 需先加载 agent-core');
        return;
    }

    WorkbenchAgent.prototype._setPickMode = function (mode) {
        this._pickMode = mode === 'inspect' ? 'inspect' : 'game';
        document.documentElement.classList.toggle('pw-inspect', this._pickMode === 'inspect');
        this._bindCanvasPick(this._isActive('pick'));
        return this._pickMode;
    };

    WorkbenchAgent.prototype._bindCanvasPick = function (on) {
        var canvas = document.getElementById('GameCanvas');
        if (!canvas) return;
        canvas.removeEventListener('pointerdown', this._onPickDown, true);
        if (on && this._pickMode === 'inspect') {
            if (!this._onPickDown) {
                var self = this;
                this._onPickDown = function (ev) {
                    if (self._pickMode !== 'inspect') return;
                    ev.preventDefault();
                    ev.stopPropagation();
                    var uuid = self._hitTest(ev.clientX, ev.clientY);
                    self._selectNode(uuid);
                    if (self._isActive('inspector') || self._isActive('hierarchy')) {
                        self._post({ type: 'event', name: 'hier.diff', data: self._getHierTree() });
                    }
                };
            }
            canvas.addEventListener('pointerdown', this._onPickDown, true);
        }
    };

    WorkbenchAgent.prototype._hitTest = function (clientX, clientY) {
        var cc = this.cc;
        var canvas = document.getElementById('GameCanvas');
        if (!cc || !canvas) return '';
        var scene = cc.director.getScene();
        if (!scene) return '';
        var stack = [];
        walk(scene, function (n) { stack.push(n); });
        for (var i = stack.length - 1; i >= 0; i--) {
            var node = stack[i];
            if (!node || !node.activeInHierarchy) continue;
            var uit = node.getComponent && node.getComponent(cc.UITransform);
            if (!uit) continue;
            var box = this._nodeClientRect(node);
            if (!box) continue;
            if (clientX >= box.left && clientX <= box.right && clientY >= box.top && clientY <= box.bottom) {
                return nodeId(node);
            }
        }
        return '';
    };

    WorkbenchAgent.prototype._ensureOverlay = function () {
        var el = document.getElementById('pw-pick-overlay');
        if (!el) {
            el = document.createElement('div');
            el.id = 'pw-pick-overlay';
            el.className = 'pw-pick-overlay';
            el.hidden = true;
            document.body.appendChild(el);
        }
        this._overlay = el;
    };

    WorkbenchAgent.prototype._nodeClientRect = function (node) {
        var cc = this.cc;
        var canvas = document.getElementById('GameCanvas');
        if (!cc || !canvas || !node || !node.isValid) return null;
        var uit = node.getComponent && node.getComponent(cc.UITransform);
        if (!uit || typeof uit.getBoundingBoxToWorld !== 'function') return null;
        var box = uit.getBoundingBoxToWorld();
        if (!box) return null;
        var canvasRect = canvas.getBoundingClientRect();
        var vs = cc.view && cc.view.getVisibleSize ? cc.view.getVisibleSize() : { width: canvasRect.width, height: canvasRect.height };
        var vw = Math.max(1, vs.width);
        var vh = Math.max(1, vs.height);
        var corners = [
            { x: box.x, y: box.y },
            { x: box.x + box.width, y: box.y },
            { x: box.x + box.width, y: box.y + box.height },
            { x: box.x, y: box.y + box.height },
        ];
        var xs = [];
        var ys = [];
        for (var i = 0; i < 4; i++) {
            xs.push(canvasRect.left + (corners[i].x / vw + 0.5) * canvasRect.width);
            ys.push(canvasRect.top + (0.5 - corners[i].y / vh) * canvasRect.height);
        }
        var left = Math.min.apply(null, xs);
        var right = Math.max.apply(null, xs);
        var top = Math.min.apply(null, ys);
        var bottom = Math.max.apply(null, ys);
        return { left: left, top: top, right: right, bottom: bottom, width: Math.max(2, right - left), height: Math.max(2, bottom - top) };
    };

    WorkbenchAgent.prototype._updateOverlay = function () {
        var node = this._findNode(this._selectedUuid);
        var overlay = this._overlay;
        if (!overlay) return;
        if (!node) {
            overlay.hidden = true;
            return;
        }
        var box = this._nodeClientRect(node);
        if (!box) {
            overlay.hidden = true;
            return;
        }
        overlay.hidden = false;
        overlay.style.position = 'fixed';
        overlay.style.left = box.left + 'px';
        overlay.style.top = box.top + 'px';
        overlay.style.width = box.width + 'px';
        overlay.style.height = box.height + 'px';
    };

    WorkbenchAgent.prototype._getOverlayRect = function () {
        var overlay = this._overlay;
        if (!overlay || overlay.hidden) return null;
        return {
            left: parseFloat(overlay.style.left) || 0,
            top: parseFloat(overlay.style.top) || 0,
            width: parseFloat(overlay.style.width) || 0,
            height: parseFloat(overlay.style.height) || 0,
        };
    };

})(window);