/*
 * SPDX-FileCopyrightText: syuilo and misskey-project
 * SPDX-License-Identifier: AGPL-3.0-only
 */

import { parse as vueSfcParse } from '@vue/compiler-sfc';
import type { Plugin } from 'rollup';
import fs from 'node:fs';
import { glob } from 'glob';
import JSON5 from 'json5';

export interface AnalysisResult {
  filePath: string;
  usage: ComponentUsageInfo[];
}

export interface ComponentUsageInfo {
  parentFile: string;
  staticProps: Record<string, string>;
  bindProps: Record<string, string>;
  componentName: string;
}

function outputAnalysisResultAsTS(outputPath: string, analysisResults: AnalysisResult[]): void {
  // (outputAnalysisResultAsTS 関数の実装は前回と同様)
  const varName = 'searchIndexes'; //  変数名

  const jsonString = JSON5.stringify(analysisResults, { space: "\t", quote: "'" }); //  JSON.stringify で JSON 文字列を生成

  //  bindProps の値を文字列置換で修正する関数
  function modifyBindPropsInString(jsonString: string): string {
    //  (modifyBindPropsInString 関数の実装は前回と同様)
    const modifiedString = jsonString.replace(
      /bindProps:\s*\{([^}]*)\}/g, //  bindProps: { ... } にマッチ (g フラグで複数箇所を置換)
      (match, bindPropsBlock) => {
        //  bindPropsBlock ( { ... } 内) の各プロパティをさらに置換
        const modifiedBlock = bindPropsBlock.replace(
          /(.*):\s*\'(.*)\'/g, //  propName: 'propValue' にマッチ
          (propMatch, propName, propValue) => {
            return `${propName}: ${propValue}`; // propValue のクォートを除去
          }
        ).replaceAll("\\'", "'");
        return `bindProps: {${modifiedBlock}}`; //  置換後の block で bindProps: { ... } を再構成
      }
    );
    return modifiedString;
  }


  const tsOutput = `
/*
 * SPDX-FileCopyrightText: syuilo and misskey-project
 * SPDX-License-Identifier: AGPL-3.0-only
 */

// This file was automatically generated by create-search-index.
// Do not edit this file.

import { i18n } from '@/i18n'; //  i18n のインポート

export const ${varName} = ${modifyBindPropsInString(jsonString)} as const;

export type AnalysisResults = typeof ${varName};
export type ComponentUsageInfo = AnalysisResults[number]['usage'][number];
`;

  try {
    fs.writeFileSync(outputPath, tsOutput, 'utf-8');
    console.log(`[create-search-index]: output done. ${outputPath}`);
  } catch (error) {
    console.error('[create-search-index]: error: ', error);
  }
}


function extractUsageInfoFromTemplateAst(
  templateAst: any,
  currentFilePath: string,
  targetComponents: string[]
): ComponentUsageInfo[] {
  const usageInfoList: ComponentUsageInfo[] = [];

  if (!templateAst) {
    return usageInfoList;
  }

  function traverse(node: any) {
    if (node.type === 1 /* ELEMENT */ && node.tag && targetComponents.includes(node.tag)) {
      const componentTag = node.tag;

      const staticProps: Record<string, string> = {};
      const bindProps: Record<string, string> = {}; // bindProps の型を string に戻す

      if (node.props && Array.isArray(node.props)) {
        node.props.forEach((prop: any) => {
          if (prop.type === 6 /* ATTRIBUTE */) { // type 6 は StaticAttribute
            staticProps[prop.name] = prop.value?.content || ''; //  属性値を文字列として取得
          } else if (prop.type === 7 /* DIRECTIVE */ && prop.name === 'bind' && prop.arg?.content) { // type 7 は DirectiveNode, v-bind:propName の場合
            if (prop.exp?.content) {
              bindProps[prop.arg.content] = prop.exp.content; // prop.exp.content (文字列) を格納
            }
          }
        });
      }

      usageInfoList.push({
        parentFile: currentFilePath,
        staticProps,
        bindProps,
        componentName: componentTag,
      });

    } else if (node.children && Array.isArray(node.children)) {
      node.children.forEach(child => traverse(child));
    }
  }

  traverse(templateAst);
  return usageInfoList;
}

export async function analyzeVueProps(options: {
  targetComponents: string[],
  targetFilePaths: string[],
  exportFilePath: string
}): Promise<void> {
  const targetComponents = options.targetComponents || [];
  const analysisResults: AnalysisResult[] = [];

  //  対象ファイルパスを glob で展開
  const filePaths = options.targetFilePaths.reduce<string[]>((acc, filePathPattern) => {
    const matchedFiles = glob.sync(filePathPattern);
    return [...acc, ...matchedFiles];
  }, []);


  for (const filePath of filePaths) {
    const code = fs.readFileSync(filePath, 'utf-8');
    const { descriptor, errors } = vueSfcParse(code, {
      filename: filePath,
    });

    if (errors.length) {
      console.error(`[create-search-index] Compile Error: ${filePath}`, errors);
      continue; // エラーが発生したファイルはスキップ
    }

    // テンプレートASTを走査してコンポーネント使用箇所とpropsの値を取得
    const usageInfo = extractUsageInfoFromTemplateAst(descriptor.template?.ast, filePath, targetComponents);
    if (!usageInfo) continue;

    if (usageInfo.length > 0) {
      analysisResults.push({
        filePath: filePath,
        usage: usageInfo,
      });
    }
  }

  outputAnalysisResultAsTS(options.exportFilePath, analysisResults); // outputAnalysisResultAsTS を呼び出す
}

// Rollup プラグインとして export
export default function vuePropsAnalyzer(options: {
  targetComponents: string[],
  targetFilePaths: string[],
  exportFilePath: string
}): Plugin {
  return {
    name: 'vue-props-analyzer',

    async writeBundle() {
      await analyzeVueProps(options); // writeBundle フックで analyzeVueProps 関数を呼び出す
    },
  };
}