<template>
  <div class="in-coder-panel">
    <textarea ref="codeform" v-model="code" class="codemirror"></textarea>
  </div>
</template>
<script>
import { watch, onMounted, onBeforeUnmount, ref } from "vue";
// 引入全局实例
import _CodeMirror from "codemirror";

// 核心样式
import "codemirror/lib/codemirror.css";
import "codemirror/addon/hint/show-hint.css";
// 引入主题后还需要在 options 中指定主题才会生效
const themList = [];
const requireModules = require.context("codemirror/theme/", false, /.css$/);
requireModules.keys().forEach((value) => {
  const newValue = value.replace(/^.\//, "").replace(/.css$/, "");
  themList.push(newValue);
});

// 需要引入具体的语法高亮库才会有对应的语法高亮效果
// import "codemirror/addon/selection/active-line";
// import "codemirror/addon/display/aoturefresh";
// codemirror 官方其实支持通过 /addon/mode/loadmode.js 和 /mode/meta.js 来实现动态加载对应语法高亮库
// 但 vue 貌似没有无法在实例初始化后再动态加载对应 JS ，所以此处才把对应的 JS 提前引入
import "codemirror/mode/javascript/javascript.js";
import "codemirror/mode/css/css.js";
import "codemirror/mode/xml/xml.js";
import "codemirror/mode/clike/clike.js";
import "codemirror/mode/markdown/markdown.js";
import "codemirror/mode/python/python.js";
import "codemirror/mode/r/r.js";
import "codemirror/mode/shell/shell.js";
import "codemirror/mode/sql/sql.js";
import "codemirror/mode/swift/swift.js";
import "codemirror/mode/vue/vue.js";
import "codemirror/mode/yaml/yaml.js";
//import "codemirror/mode/yaml-frontmatter/yaml-frontmatter.js";
require("codemirror/addon/edit/matchbrackets");
require("codemirror/addon/selection/active-line");
require("codemirror/addon/lint/yaml-lint");
require("codemirror/addon/hint/show-hint");
require("codemirror/addon/hint/anyword-hint");
require("codemirror/addon/display/autorefresh");

// 尝试获取全局实例
const CodeMirror = window.CodeMirror || _CodeMirror;

export default {
  emits: ["onUpdate:value"],
  props: {
    id: {
      type: Number,
      default: 0,
    },
    // 外部传入的内容，用于实现双向绑定
    value: {
      type: String,
      default: "",
    },
    readonly: {
      type: Boolean,
      default: false,
    },
    // 可用事件'change', 'blur'等等；具体参考codemirror文档
    eventType: {
      type: String,
      default: "blur",
    },
    // 外部传入的语法类型
    language: {
      type: String,
      default: "x-yaml",
    },
    // 编辑器主题色
    theme: {
      type: String,
      default: "mbo",
    },
  },
  setup(props, { emit }) {
    const codeform = ref(null);
    const code = ref(props.value);
    let editor = null;
    let options = {};
    let modes = {};
    // 默认配置
    options = {
      mode: "text/x-yaml",
      tabSize: 1, // 缩进格式
      indentWithTabs: true,
      smartIndent: true,
      lineWrapping: true,
      lineNumbers: true,
      matchBrackets: true,
      indentUnit: 4,
      autoRefresh: true,
      theme: props.theme ? props.theme : "mbo",
      lint: false,
      lineWiseCopyCut:false,
      readOnly: props.readonly === false ? false : "nocursor", // true: 不可编辑  false: 可编辑 'nocursor' 失焦,不可编辑
      extraKeys: { Ctrl: "autocomplete" }, //自定义快捷键
      hintOptions: {},
      // matchBrackets: true,
      // foldGutter: true,
      // gutters: ["CodeMirror-linenumbers", "CodeMirror-foldgutter"],
    };
    modes = {
      css: "text/css",
      javascript: "text/javascript",
      "xml/html": "text/html",
      yaml: "text/x-yaml",
      java: "text/x-java",
      "objective-c": "text/x-objectivec",
      python: "text/x-python",
      r: "text/x-rsrc",
      shell: "text/x-sh",
      sql: "text/x-sql",
      swift: "text/x-swift",
      vue: "text/x-vue",
      markdown: "text/markdown",
    };
    // 初始化
    function initialize() {
      if (editor) {
        editor.toTextArea();
      }
      if (props.language) {
        let lan = props.language.toLowerCase();
        let modeObj = modes[lan] ? modes[lan] : "";
        options.mode = modeObj ? modeObj : options.mode;
      }
      editor = CodeMirror.fromTextArea(codeform.value, options);
      /*editor.on("keyup", function () {
        editor.showHint();
      });*/
      // 支持双向绑定
      editor.on(props.eventType, (coder) => {
        if (emit) {
          emit("onUpdate:value", coder.getValue());
        }
      });
    }
    // 动态引入语法高亮库
    function themeImport() {
      return new Promise((resolve) => {
        themList.forEach((value) => {
          if (props.theme === value) {
            import(`codemirror/theme/${props.theme}.css`);
            resolve();
          }
        });
      });
    }
    watch(
      () => props.id,
      () => {
        themeImport().then(() => {
          initialize();
        });
      }
    );
    watch(
      () => props.value,
      (newProps) => {
        code.value = editor ? editor.setValue(newProps) : "";
        editor.refresh();
      }
    );
    onMounted(() => {
      themeImport().then(() => {
        initialize();
      });
    });
    onBeforeUnmount(() => {
      editor.off(props.eventType);
    });
    return {
      code,
      codeform,
      initialize,
    };
  },
};
</script>