/**
 * SchemaMatcher class.
 * The same as URLPattern, but for matching the whole HTTP request.
 * See: https://developer.mozilla.org/en-US/docs/Web/API/URL_Pattern_API
 * See: https://developer.chrome.com/docs/web-platform/urlpattern
 *
 * todo: move to a separate package.
 */

import { MockRequestSchema } from '../protocol';
import { UrlMatcher } from './matchers/url';
import { BodyMatcher } from './matchers/body';
import { MatchingContext } from './context';
import { MethodMatcher } from './matchers/method';
import { QueryMatcher } from './matchers/query';
import { HeadersMatcher } from './matchers/headers';
import { MatchingLogger } from './logger';

export class SchemaMatcher {
  private methodMatcher: MethodMatcher;
  private urlMatcher: UrlMatcher;
  private queryMatcher: QueryMatcher;
  private headersMatcher: HeadersMatcher;
  private bodyMatcher: BodyMatcher;

  constructor(
    public schema: MockRequestSchema,
    private logger?: MatchingLogger,
  ) {
    this.methodMatcher = new MethodMatcher(this.schema);
    this.urlMatcher = new UrlMatcher(this.schema);
    this.queryMatcher = new QueryMatcher(this.schema);
    this.headersMatcher = new HeadersMatcher(this.schema);
    this.bodyMatcher = new BodyMatcher(this.schema);

    this.ensureSingleQuerySource();
  }

  // eslint-disable-next-line visual/complexity
  async match(req: Request) {
    const { url } = this.schema;
    this.logger?.addMock(this.schema.method, typeof url === 'string' ? url : JSON.stringify(url));
    const ctx = new MatchingContext(req, this.logger);

    const matched =
      this.methodMatcher.match(ctx) &&
      this.urlMatcher.match(ctx) &&
      this.queryMatcher.match(ctx) &&
      this.headersMatcher.match(ctx) &&
      (await this.bodyMatcher.match(ctx));

    ctx.logger?.done(matched);

    return matched ? ctx.params : null;
  }

  private ensureSingleQuerySource() {
    if (this.urlMatcher.hasQuery && this.queryMatcher.hasQuery) {
      throw new Error(
        `Query parameters should be defined either in the URL pattern or in the 'query' field.`,
      );
    }
  }
}