const fs = require('fs');
const path = require('path');
const readline = require('readline');
const babel = require("@babel/core");

const iOSBabelConfig = {
  presets: [
    [
      '@babel/env',
      {
        targets: {
          safari: '8',
        },
      },
    ],
  ],
};

const CodePieces = {
  headers: `/*
* native-source-code.cc for Hippy
*
* The file is generated by js2cpp for Hippy.
* js2cpp is maintenance by Lucas Pei <lucaspei@tencent.com>
* Copyright © ${new Date().getFullYear()} Tencent. All rights reserved.
*
* Generated at ${new Date().toString()}.
* DO NOT EDIT IT.
*/
#include "core/napi/native-source-code.h"
#include <unordered_map>
#include "core/base/macros.h"

// clang-format off

namespace {`,
    piece_1: `
}  // namespace

namespace hippy {
  static const std::unordered_map<std::string, NativeSourceCode> golbal_base_js_source_map{
    {"bootstrap.js", {k_bootstrap, arraysize(k_bootstrap) - 1}},  // NOLINT
    {"hippy.js", {k_hippy, arraysize(k_hippy) - 1}},  // NOLINT`,
  piece_2: `
  };
  const NativeSourceCode GetNativeSourceCode(const std::string& filename) {
    const auto it = golbal_base_js_source_map.find(filename);
    return it != golbal_base_js_source_map.cend() ? it->second : NativeSourceCode{};
  }
}  // namespace hippy
`,
};

let wraperFront_buffer = fs.readFileSync(`${__dirname}/wraperFront.js`);
let wraperFront_byte_arr = [];
for (let i = 0; i < wraperFront_buffer.length; i++) {
  wraperFront_byte_arr.push(wraperFront_buffer[i]);
}

let wraperEnd_buffer = fs.readFileSync(`${__dirname}/wraperEnd.js`);
let wraperEnd_byte_arr = [];
for(let i = 0; i < wraperEnd_buffer.length; i++) {
  wraperEnd_byte_arr.push(wraperEnd_buffer[i]);
}

function GetAllRequiredFiles(platform) {
  return new Promise((resole, reject) => {
    let rl = readline.createInterface({
      input: fs.createReadStream(path.resolve(__dirname, `../../core/js/entry/${platform}/hippy.js`))
    });
    let filePaths = [
      path.resolve(__dirname, './bootstrap.js'),
      path.resolve(__dirname, `../../core/js/entry/${platform}/hippy.js`),
      path.resolve(__dirname, '../../core/js/modules/ExceptionHandle.js'),
    ];
    rl.on('line', (line) => {
      if(line.split('//')[0].indexOf('require') > -1) {
        let _path = line.split("('")[1].split("')")[0];
        filePaths.push(`${__dirname}/../../core/js/entry/${platform}/${_path}`);
      }
    });
    rl.on('close', () => {
      resole(filePaths);
    });
  });
}

function readFileToBuffer(platform, filePath) {
  switch(platform) {
    case 'android': {
      return fs.readFileSync(filePath);
    }
    case 'ios': {
      const code = fs.readFileSync(filePath).toString();
      const compiled = babel.transform(code, iOSBabelConfig);
      return Buffer.from(compiled.code);
    }
  }
}

function GenerateCPP(platform, buildDirPath) {
    let code = CodePieces.headers;

    GetAllRequiredFiles(platform).then((files_arr) => {
        files_arr.forEach((filePath) => {
            let file_split_arr = filePath.split('/');
            let file_name = file_split_arr[file_split_arr.length - 1].split('.')[0];
            let file_buffer = readFileToBuffer(platform, filePath);
            let byte_arr = [];
            for(let i = 0; i < file_buffer.length; i++) {
                byte_arr.push(file_buffer[i]);
            }
            if(file_name === 'bootstrap' || file_name === 'ExceptionHandle') {
                code += `
  const uint8_t k_${file_name}[] = { ${byte_arr.join(',')},0 };  // NOLINT`;
            }
            else {
                code += `
  const uint8_t k_${file_name}[] = { ${wraperFront_byte_arr.join(',')},${byte_arr.join(',')},${wraperEnd_byte_arr.join(',')},0 };  // NOLINT`;
            }
        });

        code += CodePieces.piece_1;

        for(let i = 2; i < files_arr.length; i++) {
            let file_split_arr = files_arr[i].split('/');
            let file_name = file_split_arr[file_split_arr.length - 1].split('.')[0];
            code += `
      {"${file_name}.js", {k_${file_name}, arraysize(k_${file_name}) - 1}},  // NOLINT`;
        }

        code += CodePieces.piece_2;
                    
        // step4 - create file
        const targetPath = `${buildDirPath}/native-source-code-${platform}.cc`;
        fs.writeFile(targetPath, code, function( err ) {
            if( err ) {
                console.log( "[writeFile error] : ", err );
                return;
            }
            console.log(`${platform} convert success, output ${targetPath}`);
        });
    });
}

GenerateCPP('ios', path.resolve(__dirname, '../../core/napi/jsc'));
GenerateCPP('android', path.resolve(__dirname, '../../core/napi/v8/'));

/* eslint-disable */