/*
 * @Author: CGT (caogtaa@gmail.com) 
 * @Date: 2020-01-16 22:09:08 
 * @Last Modified by: CGT (caogtaa@gmail.com)
 * @Last Modified time: 2020-01-16 23:46:33
 */

'use strict';

let _menuTemplateCache = null;
let _paramCache = {};

function createNode(uuid) {
    let param = {uuid: uuid};
    Object.assign(param, _paramCache);
    Editor.Scene.callSceneScript('cc-ext-scene-menu', 'create-node', param, (err) => {
        if (err)
            Editor.log(err);
    });
}

function sendCommand(command, param) {
    let p = {};
    Object.assign(p, _paramCache);
    p.customParam = param;
    Editor.Ipc.sendToMain(command, p, null);
}

function generateMenuTemplate(conf) {
    let result = [];
    for (let c of conf) {
        // https://electronjs.org/docs/api/menu
        let item = {};
        item.label = c.name;

        // item.click = createNode.bind(c.uuid);
        // the menu item auto unbound my function, why?
        // so I put uuid in closure
        if (c.type == 0) {
            // prefab
            let uuid = c.uuid;
            item.click = () => {
                createNode(uuid);
            };
        } else if (c.type == 1) {
            // command
            item.click = () => {
                sendCommand(c.command, c.param);
            };
        } else if (c.submenu) {
            item.submenu = generateMenuTemplate(c.submenu);
        } else {
            // unexpected
        }

        result.push(item);
    }

    return result;
}

function loadMenu() {
    const fs = require('fs');
    let configPath = Editor.Project.path + '/scene-menu-config.json';
    if (!fs.existsSync(configPath)) {
        // read default config
        configPath = Editor.url('packages://cc-ext-scene-menu/default-config.json');
    }

    fs.readFile(configPath, function (err, data) {
        if (err) {
            // file not exists
            return;
        }

        try {
            // Editor.log(`main.js read data: ${data}`);
            let config = JSON.parse(data);
            _menuTemplateCache = generateMenuTemplate(config);
        } catch (err) {
            // if any error occur, old template cache is not replaced
        } finally {

        }
    });
}

function injectContextMenu(webContents) {
    if (webContents.__gt_injected) {
        // already injected
        return;
    }

    if (Editor.Window.main && webContents != Editor.Window.main.nativeWin.webContents) {
        // not cc main app window
        return;
    }
    webContents.__gt_injected = true;

    let hackCode = `
    (() => {
      function appendListener(node, eventType, fn = null) {
        node.addEventListener(eventType, (e) => {
          if (fn)	fn(e);
        }, true);		
      }
    
      let getLabelRoot = (gridRoot, className) => {
        for (let c of gridRoot.children) {
          if (c.className === className)
            return c;
        }
    
        return null;
      };
    
      let getPixel = (elem) => {
        return parseFloat(elem.style.transform.match(/(-?[0-9\.]+)/g)[0]);
      };
    
      let getWorldPos = (elem) => {
        return parseFloat(elem.innerText.replace(/,/g, ''));
      };
    
      let pixelToWorld = (labelRoot, pixel) => {
        let pmin = getPixel(labelRoot.firstChild);
        let pmax = getPixel(labelRoot.lastChild);
        let wmin = getWorldPos(labelRoot.firstChild);
        let wmax = getWorldPos(labelRoot.lastChild);
        return (pixel - pmin) * (wmax - wmin) / (pmax - pmin) + wmin;
      };
    
      let svgPosToWorld = (x, y) => {
        let gridRoot = document.getElementById('scene').shadowRoot.getElementById('sceneView').shadowRoot.getElementById('grid').shadowRoot;
        let vLabelRoot = getLabelRoot(gridRoot, 'vLabels');
        let hLabelRoot = getLabelRoot(gridRoot, 'hLabels');
        let worldX = pixelToWorld(hLabelRoot, x+4); // horizontal label offset = 4 (move rightward in svg)
        let worldY = pixelToWorld(vLabelRoot, y-15);  // vertical label offset = -15 (move upward in svg)
        return [worldX, worldY];
      };

      let svgNode = null;
      let downX = 0;
      let downY = 0;
      let isDown = false;
      let postContextMenuMsg = () => {
        let rect = svgNode.getBoundingClientRect();
        downX -= rect.left;
        downY -= rect.top;
        let worldX = 0;
        let worldY = 0;
        try {
          let arr = svgPosToWorld(downX, downY);
          worldX = arr[0];
          worldY = arr[1];
        } catch(error) {}

        Editor.Ipc.sendToMain('cc-ext-scene-menu:on-context-menu', 
          {x: downX, y: downY, worldX: worldX, worldY: worldY}, null);
      };
    
      appendListener(document, 'mousedown', (e) => {
        if (e.button != 2)
          return;

        // check if inside svg view
        if (!svgNode)
          svgNode = document.getElementById('scene').shadowRoot.getElementById('sceneView').shadowRoot.getElementById('gizmosView').shadowRoot.getElementById('SvgjsSvg1000');
        
        if (!svgNode) {
          Editor.log('svg view not ready');
          return;
        }
    
        let rect = svgNode.getBoundingClientRect();
        if (e.pageX >= rect.left && e.pageX < rect.right && e.pageY >= rect.top && e.pageY < rect.bottom) {
          downX = e.pageX;
          downY = e.pageY;
          isDown = true;
        }
      });
    
      appendListener(document, 'mouseup', (e) => {
        if (e.button == 2 && isDown && e.pageX == downX && e.pageY == downY) {
          isDown = false;
          postContextMenuMsg();
        }
      });
    })();

    1+2+3
  `;

    webContents.executeJavaScript(hackCode, function (result) {
        // result = 6
    });
}

module.exports = {
    load() {
        loadMenu();
        try {
            if (Editor.Window.main && Editor.Window.main.nativeWin.webContents.__gt_injected) {
                // in case plugin if reloaded
                return;
            }
        } catch (error) {
            // usually happen when creator is just started and main window is not created
            Editor.log(error);
        }

        // todo: 如果插件是中途加载的，判断webContents如果就绪了就注入
        const electron = require('electron');
        let injectFn = injectContextMenu;
        electron.app.on('web-contents-created', (sender, webContents) => {
            webContents.on('dom-ready', (e) => {
                injectFn(e.sender);
            });
        });
    },

    unload() {
        // let webContenst = Editor.Window.main.nativeWin.webContents;
        // if (webContenst.__gt_injected) {
        //     // todo: removeEventListeners
        //     webContenst.__gt_injected = false;
        // }
        // execute when package unloaded
    },

    // register your ipc messages here
    messages: {
        'create-node'() {
            Editor.Scene.callSceneScript('cc-ext-scene-menu', 'create-node', null, function (err) {
                // Editor.log('create-node finish');
            });
        },
        'on-context-menu'(event, param) {
            param = param || {x: 0, y: 0, worldX: 0, worldY: 0};
            _paramCache = param;
            if (_menuTemplateCache) {
                Editor.Window.main.popupMenu(_menuTemplateCache, param.x, param.y);
            }
        },
        'custom-context-menu'() {
            Editor.Panel.open('cc-ext-scene-menu');
        },
        'editGame'() {
            // Editor.log('打开导入关卡面板')
            Editor.Panel.open('cc-ext-scene-menu.editGame');
        },
        'update-context-menu'() {
            loadMenu();
        },
        'say-hello'(event, param) {
            Editor.log(`Hello! param: {worldX = ${param.worldX}, worldY = ${param.worldY}}, customParam = ${param.customParam}`);
        }
    },
};