import { basename } from 'path';
import { copyBaseApplicationProject } from '@/utils/app-template';
import { convertToLabel } from '@/utils/convert-to-label';
import { install } from '@/utils/install';
import {
  type LocalInstanceResult,
  setupLocalInstance,
} from '@/utils/setup-local-instance';
import { tryGitInit } from '@/utils/try-git-init';
import chalk from 'chalk';
import * as fs from 'fs-extra';
import inquirer from 'inquirer';
import kebabCase from 'lodash.kebabcase';
import { execSync } from 'node:child_process';
import * as path from 'path';
import { isDefined } from 'twenty-shared/utils';

import {
  type ExampleOptions,
  type ScaffoldingMode,
} from '@/types/scaffolding-options';

const CURRENT_EXECUTION_DIRECTORY = process.env.INIT_CWD || process.cwd();

type CreateAppOptions = {
  directory?: string;
  mode?: ScaffoldingMode;
  name?: string;
  displayName?: string;
  description?: string;
  skipLocalInstance?: boolean;
  port?: number;
};

export class CreateAppCommand {
  async execute(options: CreateAppOptions = {}): Promise<void> {
    const { appName, appDisplayName, appDirectory, appDescription } =
      await this.getAppInfos(options);

    try {
      const exampleOptions = this.resolveExampleOptions(
        options.mode ?? 'exhaustive',
      );

      await this.validateDirectory(appDirectory);

      this.logCreationInfo({ appDirectory, appName });

      await fs.ensureDir(appDirectory);

      await copyBaseApplicationProject({
        appName,
        appDisplayName,
        appDescription,
        appDirectory,
        exampleOptions,
      });

      await install(appDirectory);

      await tryGitInit(appDirectory);

      let localResult: LocalInstanceResult = { running: false };

      if (!options.skipLocalInstance) {
        localResult = await setupLocalInstance(appDirectory, options.port);

        if (localResult.running && localResult.serverUrl) {
          await this.connectToLocal(appDirectory, localResult.serverUrl);
        }
      }

      this.logSuccess(appDirectory, localResult);
    } catch (error) {
      console.error(
        chalk.red('\nCreate application failed:'),
        error instanceof Error ? error.message : error,
      );
      process.exit(1);
    }
  }

  private async getAppInfos(options: CreateAppOptions): Promise<{
    appName: string;
    appDisplayName: string;
    appDescription: string;
    appDirectory: string;
  }> {
    const { directory } = options;

    const hasName = isDefined(options.name) || isDefined(directory);
    const hasDisplayName = isDefined(options.displayName);
    const hasDescription = isDefined(options.description);

    const { name, displayName, description } = await inquirer.prompt([
      {
        type: 'input',
        name: 'name',
        message: 'Application name:',
        when: () => !hasName,
        default: 'my-twenty-app',
        validate: (input) => {
          if (input.length === 0) return 'Application name is required';
          return true;
        },
      },
      {
        type: 'input',
        name: 'displayName',
        message: 'Application display name:',
        when: () => !hasDisplayName,
        default: (answers: { name?: string }) => {
          return convertToLabel(
            answers?.name ?? options.name ?? directory ?? '',
          );
        },
      },
      {
        type: 'input',
        name: 'description',
        message: 'Application description (optional):',
        when: () => !hasDescription,
        default: '',
      },
    ]);

    const appName = (
      options.name ??
      name ??
      directory ??
      'my-twenty-app'
    ).trim();

    const appDisplayName =
      (options.displayName ?? displayName)?.trim() || convertToLabel(appName);

    const appDescription = (options.description ?? description ?? '').trim();

    const appDirectory = directory
      ? path.join(CURRENT_EXECUTION_DIRECTORY, directory)
      : path.join(CURRENT_EXECUTION_DIRECTORY, kebabCase(appName));

    return { appName, appDisplayName, appDirectory, appDescription };
  }

  private resolveExampleOptions(mode: ScaffoldingMode): ExampleOptions {
    if (mode === 'minimal') {
      return {
        includeExampleObject: false,
        includeExampleField: false,
        includeExampleLogicFunction: false,
        includeExampleFrontComponent: false,
        includeExampleView: false,
        includeExampleNavigationMenuItem: false,
        includeExampleSkill: false,
        includeExampleAgent: false,
        includeExampleIntegrationTest: false,
      };
    }

    return {
      includeExampleObject: true,
      includeExampleField: true,
      includeExampleLogicFunction: true,
      includeExampleFrontComponent: true,
      includeExampleView: true,
      includeExampleNavigationMenuItem: true,
      includeExampleSkill: true,
      includeExampleIntegrationTest: true,
      includeExampleAgent: true,
    };
  }

  private async validateDirectory(appDirectory: string): Promise<void> {
    if (!(await fs.pathExists(appDirectory))) {
      return;
    }

    const files = await fs.readdir(appDirectory);
    if (files.length > 0) {
      throw new Error(
        `Directory ${appDirectory} already exists and is not empty`,
      );
    }
  }

  private logCreationInfo({
    appDirectory,
    appName,
  }: {
    appDirectory: string;
    appName: string;
  }): void {
    console.log(
      chalk.blue('\n', 'Creating Twenty Application\n'),
      chalk.gray(`- Directory: ${appDirectory}\n`, `- Name: ${appName}\n`),
    );
  }

  private async connectToLocal(
    appDirectory: string,
    serverUrl: string,
  ): Promise<void> {
    try {
      execSync(`yarn twenty remote add ${serverUrl} --as local`, {
        cwd: appDirectory,
        stdio: 'inherit',
      });
    } catch {
      console.log(
        chalk.yellow(
          'Authentication skipped. Run `yarn twenty remote add --local` manually.',
        ),
      );
    }
  }

  private logSuccess(
    appDirectory: string,
    localResult: LocalInstanceResult,
  ): void {
    const dirName = basename(appDirectory);

    console.log(chalk.blue('\nApplication created. Next steps:'));
    console.log(chalk.gray(`- cd ${dirName}`));

    if (!localResult.running) {
      console.log(
        chalk.gray(
          '- yarn twenty remote add --local  # Authenticate with Twenty',
        ),
      );
    }

    console.log(
      chalk.gray('- yarn twenty dev                  # Start dev mode'),
    );
  }
}