const pluginConfig = require('../pluginConfig.json');
const fs = require('fs');
const glob = require('glob');

const autogenerationDisclaimer = `
// THIS FILE IS AUTOGENERATED AS PART OF THE EXTENSION AND MODE PLUGIN PROCESS.
// IT SHOULD NOT BE MODIFIED MANUALLY \n`;

function constructLines(input, categoryName) {
  let pluginCount = 0;

  const lines = {
    importLines: [],
    addToWindowLines: [],
  };

  if (!input) return lines;

  input.forEach(entry => {
    if (entry.default === false) return;

    const packageName = entry.packageName;
    const defaultImportName = `${categoryName}${pluginCount}`;

    lines.importLines.push(
      `import ${defaultImportName} from '${packageName}';\n`
    );
    lines.addToWindowLines.push(
      `${categoryName}.push(${defaultImportName});\n`
    );

    pluginCount++;
  });

  return lines;
}

function getFormattedImportBlock(importLines) {
  let content = '';
  // Imports
  importLines.forEach(importLine => {
    content += importLine;
  });

  return content;
}

function getFormattedWindowBlock(addToWindowLines) {
  let content =
    'const extensions = [];\n' +
    'const modes = [];\n' +
    'const modesFactory = [];\n' +
    'window.extensions = extensions;\n' +
    'window.modes = modes;\n\n';

  addToWindowLines.forEach(addToWindowLine => {
    content += addToWindowLine;
  });

  return content;
}

function getRuntimeLoadModesExtensions() {
  return (
    '\n\n// Add a dynamic runtime loader\n' +
    'export default async () => {\n' +
    ' for(const modeFactory of modesFactory) {\n' +
    '  const newModes = await modeFactory(modes,extensions);\n' +
    '  newModes.forEach(newMode => modes.push(newMode));\n' +
    '}\n}\n\n\n' +
    'async function loadRuntimeImports(config) {\n' +
    '  if (config && config.modes && config.modes.length) {\n' +
    '    for (const modeName of config.modes) {\n' +
    '      const existingMode = modes.find(mode => mode.id === modeName);\n' +
    '      if (!existingMode) {\n' +
    '        if (modeName === `@ohif/mode-test`) {\n' +
    '          const mode = await import(`@ohif/mode-test`);\n' +
    '          window.modes.push(mode.default);\n' +
    '          const extension = await import(`@ohif/extension-test`);\n' +
    '          window.extensions.push(extension.default);\n' +
    '        }\n' +
    '      }\n' +
    '    };\n' +
    '  }\n' +
    '}\n' +
    'export { loadRuntimeImports };\n\n'
  );
}

const createCopyPluginToDistForLink = (
  SRC_DIR,
  DIST_DIR,
  plugins,
  folderName
) => {
  return plugins
    .map(plugin => {
      const from = `${SRC_DIR}/../node_modules/${plugin.packageName}/${folderName}/`;
      const exists = fs.existsSync(from);
      return exists
        ? {
            from,
            to: DIST_DIR,
            toType: 'dir',
          }
        : undefined;
    })
    .filter(x => !!x);
};

const createCopyPluginToDistForBuild = (
  SRC_DIR,
  DIST_DIR,
  plugins,
  folderName
) => {
  return plugins
    .map(plugin => {
      const from = `${SRC_DIR}/../../../node_modules/${plugin.packageName}/${folderName}/`;
      const exists = fs.existsSync(from);
      return exists
        ? {
            from,
            to: DIST_DIR,
            toType: 'dir',
          }
        : undefined;
    })
    .filter(x => !!x);
};

function writePluginImportsFile(SRC_DIR, DIST_DIR) {
  let pluginImportsJsContent = autogenerationDisclaimer;

  const extensionLines = constructLines(pluginConfig.extensions, 'extensions');
  const modeLines = constructLines(pluginConfig.modes, 'modes');
  const modesFactoryLines = constructLines(
    pluginConfig.modesFactory,
    'modesFactory'
  );

  pluginImportsJsContent += getFormattedImportBlock([
    ...extensionLines.importLines,
    ...modeLines.importLines,
    ...modesFactoryLines.importLines,
  ]);
  pluginImportsJsContent += getFormattedWindowBlock([
    ...extensionLines.addToWindowLines,
    ...modeLines.addToWindowLines,
    ...modesFactoryLines.addToWindowLines,
  ]);

  pluginImportsJsContent += getRuntimeLoadModesExtensions();

  fs.writeFileSync(
    `${SRC_DIR}/pluginImports.js`,
    pluginImportsJsContent,
    { flag: 'w+' },
    err => {
      if (err) {
        console.error(err);
        return;
      }
    }
  );

  // Build packages using cli add-mode and add-extension
  // will get added to the root node_modules, but the linked packages
  // will be hosted at the viewer node_modules.

  const copyPluginPublicToDistBuild = createCopyPluginToDistForBuild(
    SRC_DIR,
    DIST_DIR,
    [
      ...pluginConfig.modesFactory,
      ...pluginConfig.modes,
      ...pluginConfig.extensions,
      ...pluginConfig.umd,
    ],
    'public'
  );

  const copyPluginPublicToDistLink = createCopyPluginToDistForLink(
    SRC_DIR,
    DIST_DIR,
    [
      ...pluginConfig.modesFactory,
      ...pluginConfig.modes,
      ...pluginConfig.extensions,
      ...pluginConfig.umd,
    ],
    'public'
  );

  // Temporary way to copy chunks from the dist folder so that the become
  // available
  const copyPluginDistToDistBuild = createCopyPluginToDistForBuild(
    SRC_DIR,
    DIST_DIR,
    [
      ...pluginConfig.modesFactory,
      ...pluginConfig.modes,
      ...pluginConfig.extensions,
      ...pluginConfig.umd,
    ],
    'dist'
  );

  const copyPluginDistToDistLink = createCopyPluginToDistForLink(
    SRC_DIR,
    DIST_DIR,
    [
      ...pluginConfig.modesFactory,
      ...pluginConfig.modes,
      ...pluginConfig.extensions,
      ...pluginConfig.umd,
    ],
    'dist'
  );

  console.log('copy plugins', [
    ...copyPluginPublicToDistBuild,
    ...copyPluginPublicToDistLink,
    ...copyPluginDistToDistBuild,
    ...copyPluginDistToDistLink,
  ]);
  return [
    ...copyPluginPublicToDistBuild,
    ...copyPluginPublicToDistLink,
    ...copyPluginDistToDistBuild,
    ...copyPluginDistToDistLink,
  ];
}

module.exports = writePluginImportsFile;