import { Path, resolve } from '@angular-devkit/core';
import { Rule, SchematicContext, Tree } from '@angular-devkit/schematics';
import { rxTransformJsonFile } from '@ibm-wch-sdk/schematics-utils';
import { isNotNil } from '@ibm-wch-sdk/utils';
import { of } from 'rxjs';
import { mapTo } from 'rxjs/operators';

import { findWchToolsOptions } from '../utilities/wch';
import { Schema } from './schema';

export const OLD_WCHTOOLS_OPTIONS: Path = '../.wchtoolsoptions' as Path;

export function updateWchtoolsOptions(options: Schema): Rule {
  return (host: Tree, context: SchematicContext) => {
    // data dir
    const url = options.url;

    const opts = findWchToolsOptions(host);
    if (!host.exists(opts)) {
      // check if we can move the other file
      const oldOpts = resolve(opts, OLD_WCHTOOLS_OPTIONS);
      if (host.exists(oldOpts)) {
        // move
        host.rename(oldOpts, opts);
      }
    }

    if (isNotNil(url)) {
      return rxTransformJsonFile(
        opts,
        (aOpts: any) =>
          of({
            ...aOpts,
            'x-ibm-dx-tenant-base-url': url
          }),
        host
      ).pipe(mapTo(host));
    }

    return host;
  };
}