/*
 * Copyright (C) 2018-2021 StApps
 * This program is free software: you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation, version 3.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program. If not, see <https://www.gnu.org/licenses/>.
 */
import {Logger} from '@openstapps/logger';
import {Command} from 'commander';
import {existsSync, readFileSync, writeFileSync} from 'fs';
import path from 'path';
import {lightweightDefinitionsFromPath, lightweightProjectFromPath} from '@openstapps/easy-ast';
import {openapi3Template} from './resources/openapi-303-template.js';
import {gatherRouteInformation, generateOpenAPIForRoute} from './routes.js';
import {Converter, getValidatableTypesInPath} from './schema.js';
import {createDiagram, createDiagramFromString} from './uml/create-diagram.js';
import {UMLConfig} from './uml/uml-config.js';
import {capitalize} from './util/string.js';
import {validateFiles, writeReport} from './validate.js';
import {fileURLToPath} from 'url';
import {mkdir, readFile} from 'fs/promises';

// handle unhandled promise rejections
process.on('unhandledRejection', async (reason: unknown) => {
  if (reason instanceof Error) {
    await Logger.error(reason.message);
    Logger.info(reason.stack);
  }
  process.exit(1);
});

const commander = new Command('openstapps-core-tools');

// eslint-disable-next-line unicorn/prefer-module
commander.version(
  JSON.parse(
    readFileSync(path.join(path.dirname(fileURLToPath(import.meta.url)), '..', 'package.json')).toString(),
  ).version,
);

commander.command('prototype <srcBundle> <out>').action(async (sourcePath, out) => {
  const files = lightweightProjectFromPath(sourcePath);
  writeFileSync(path.resolve(out), JSON.stringify(files, undefined, 2));
});

commander
  .command('openapi <srcPath> <outDirPath>')
  .action(async (relativeSourceBundlePath, relativeOutDirectoryPath) => {
    // get absolute paths
    const sourcePath = path.resolve(relativeSourceBundlePath);
    const outDirectoryPath = path.resolve(relativeOutDirectoryPath);
    const outDirectorySchemasPath = path.join(outDirectoryPath, 'schema');

    // get information about routes
    const routes = await gatherRouteInformation(sourcePath);
    routes.sort((a, b) => a.route.urlPath.localeCompare(b.route.urlPath));

    // change url path parameters to openapi notation
    for (const routeWithMetaInformation of routes) {
      routeWithMetaInformation.route.urlPath = routeWithMetaInformation.route.urlPath.replaceAll(
        /:\w+/g,
        (match: string) => `{${match.replace(':', '')}}`,
      );
    }

    // keep openapi tags for routes that actually share url fragments
    let tagsToKeep = routes.map(routeWithMetaInformation =>
      capitalize(routeWithMetaInformation.route.urlPath.split('/')[1]),
    );
    tagsToKeep = tagsToKeep.filter(
      (element, i, array) => array.indexOf(element) === i && array.lastIndexOf(element) !== i,
    );

    // initialize json output
    const output = openapi3Template;

    // generate documentation for all routes
    for (const routeWithMetaInformation of routes) {
      routeWithMetaInformation.tags = [capitalize(routeWithMetaInformation.route.urlPath.split('/')[1])];

      output.paths[routeWithMetaInformation.route.urlPath] = generateOpenAPIForRoute(
        routeWithMetaInformation,
        path.relative(relativeOutDirectoryPath, outDirectorySchemasPath),
        tagsToKeep,
      );
    }

    // write openapi object to file (prettified)
    writeFileSync(path.join(outDirectoryPath, 'openapi.json'), JSON.stringify(output, undefined, 2));

    Logger.ok(`OpenAPI representation resources written to ${outDirectoryPath} .`);
  });

commander.command('schema <srcPath> <schemaPath>').action(async (relativeSourcePath, relativeSchemaPath) => {
  // get absolute paths
  const absoluteSourcePath = path.resolve(relativeSourcePath);
  const schemaPath = path.resolve(relativeSchemaPath);

  // initialize new core converter
  const coreConverter = new Converter(absoluteSourcePath);

  // get validatable types
  const validatableTypes = getValidatableTypesInPath(absoluteSourcePath);

  Logger.info(`Found ${validatableTypes.length} type(s) to generate schemas for.`);

  await mkdir(schemaPath, {
    recursive: true,
  });

  Logger.info(`Trying to find a package.json for ${absoluteSourcePath}.`);

  let packagePath = absoluteSourcePath;
  // TODO: this check should be less ugly! --- What is this doing anyway?
  while (!existsSync(path.join(packagePath, 'package.json')) && packagePath.length > 5) {
    packagePath = path.resolve(packagePath, '..');
  }

  const corePackageJsonPath = path.join(packagePath, 'package.json');

  Logger.info(`Using ${corePackageJsonPath} to determine version for schemas.`);

  const buffer = await readFile(corePackageJsonPath);
  const corePackageJson = JSON.parse(buffer.toString());
  const coreVersion = corePackageJson.version;

  Logger.log(`Using ${coreVersion} as version for schemas.`);

  // generate and write JSONSchema files for validatable types
  for (const type of validatableTypes) {
    const schema = coreConverter.getSchema(type, coreVersion);

    const stringifiedSchema = JSON.stringify(schema, undefined, 2);

    const file = path.join(schemaPath, `${type}.json`);

    // write schema to file
    writeFileSync(file, stringifiedSchema);

    Logger.info(`Generated schema for ${type} and saved to ${file}.`);
  }

  Logger.ok(`Generated schemas for ${validatableTypes.length} type(s).`);
});

commander
  .command('validate <schemaPath> <testPath> [reportPath]')
  .action(async (relativeSchemaPath, relativeTestPath, relativeReportPath) => {
    // get absolute paths
    const schemaPath = path.resolve(relativeSchemaPath);
    const testPath = path.resolve(relativeTestPath);

    const errorsPerFile = await validateFiles(schemaPath, testPath);

    let unexpected = false;
    for (const file in errorsPerFile) {
      if (!errorsPerFile.hasOwnProperty(file)) {
        continue;
      }

      unexpected = unexpected || errorsPerFile[file].some(error => !error.expected);
    }

    if (relativeReportPath !== undefined) {
      const reportPath = path.resolve(relativeReportPath);
      await writeReport(reportPath, errorsPerFile);
    }

    if (unexpected) {
      await Logger.error('Unexpected errors occurred during validation');
      process.exit(1);
    } else {
      Logger.ok('Successfully finished validation.');
    }
  });

commander
  .command('plantuml <srcPath> <plantumlserver>')
  .option('--definitions <definitions>', 'Shows these specific definitions (class, interface or enum)', it =>
    it.split(','),
  )
  .option('--showAssociations', 'Shows associations of definitions')
  .option('--showInheritance', 'Shows extensions and implementations of definitions')
  .option('--showEnumValues', 'Show enum values')
  .option('--showProperties', 'Show attributes')
  .option('--showInheritedProperties', 'Shows inherited attributes, needs --showProperties')
  .option('--showOptionalProperties', 'Shows optional attributes and relations, needs --showProperties')
  .option('--excludeExternals', 'Exclude external definitions')
  .option('--outputFileName <fileName>', 'Defines the filename of the output')
  .action(async (relativeSourcePath, plantumlServer, options) => {
    const plantUmlConfig: UMLConfig = {
      definitions: options.definitions === undefined ? [] : options.definitions,
      showAssociations: options.showAssociations === undefined ? false : options.showAssociations,
      showEnumValues: options.showEnumValues === undefined ? false : options.showEnumValues,
      showInheritance: options.showInheritance === undefined ? false : options.showInheritance,
      showInheritedProperties:
        options.showInheritedProperties === undefined ? false : options.showInheritedProperties,
      showOptionalProperties:
        options.showOptionalProperties === undefined ? false : options.showOptionalProperties,
      showProperties: options.showProperties === undefined ? false : options.showProperties,
    };
    if (options.outputFileName !== undefined) {
      plantUmlConfig.outputFileName = options.outputFileName;
    }

    Logger.log(`PlantUML options: ${JSON.stringify(plantUmlConfig)}`);

    await createDiagram(lightweightDefinitionsFromPath(relativeSourcePath), plantUmlConfig, plantumlServer);
  });

commander
  .command('plantuml-file <inputFile> <plantumlserver> [outputFile]')
  .action(async (file: string, plantumlServer: string, outputFile: string) => {
    const fileContent = readFileSync(path.resolve(file)).toString();
    await createDiagramFromString(fileContent, plantumlServer, outputFile);
  });

commander.parse(process.argv);