import { PromCompleter } from '../completer';
import { PrometheusDatasource } from '../datasource';
import { BackendSrv } from 'app/core/services/backend_srv';
jest.mock('../datasource');
jest.mock('app/core/services/backend_srv');

describe('Prometheus editor completer', () => {
  function getSessionStub(data) {
    return {
      getTokenAt: jest.fn(() => data.currentToken),
      getTokens: jest.fn(() => data.tokens),
      getLine: jest.fn(() => data.line),
    };
  }

  const editor = {};

  const backendSrv = {} as BackendSrv;
  const datasourceStub = new PrometheusDatasource({}, {}, backendSrv, {}, {});

  datasourceStub.metadataRequest = jest.fn(() =>
    Promise.resolve({ data: { data: [{ metric: { job: 'node', instance: 'localhost:9100' } }] } })
  );
  datasourceStub.getTimeRange = jest.fn(() => {
    return { start: 1514732400, end: 1514818800 };
  });
  datasourceStub.performSuggestQuery = jest.fn(() => Promise.resolve(['node_cpu']));

  const templateSrv = {
    variables: [
      {
        name: 'var_name',
        options: [{ text: 'foo', value: 'foo', selected: false }, { text: 'bar', value: 'bar', selected: true }],
      },
    ],
  };
  const completer = new PromCompleter(datasourceStub, templateSrv);

  describe('When inside brackets', () => {
    it('Should return range vectors', () => {
      const session = getSessionStub({
        currentToken: { type: 'paren.lparen', value: '[', index: 2, start: 9 },
        tokens: [{ type: 'identifier', value: 'node_cpu' }, { type: 'paren.lparen', value: '[' }],
        line: 'node_cpu[',
      });

      return completer.getCompletions(editor, session, { row: 0, column: 10 }, '[', (s, res) => {
        expect(res[0].caption).toEqual('$__interval');
        expect(res[0].value).toEqual('[$__interval');
        expect(res[0].meta).toEqual('range vector');
      });
    });
  });

  describe('When inside label matcher, and located at label name', () => {
    it('Should return label name list', () => {
      const session = getSessionStub({
        currentToken: {
          type: 'entity.name.tag.label-matcher',
          value: 'j',
          index: 2,
          start: 9,
        },
        tokens: [
          { type: 'identifier', value: 'node_cpu' },
          { type: 'paren.lparen.label-matcher', value: '{' },
          {
            type: 'entity.name.tag.label-matcher',
            value: 'j',
            index: 2,
            start: 9,
          },
          { type: 'paren.rparen.label-matcher', value: '}' },
        ],
        line: 'node_cpu{j}',
      });

      return completer.getCompletions(editor, session, { row: 0, column: 10 }, 'j', (s, res) => {
        expect(res[0].meta).toEqual('label name');
      });
    });
  });

  describe('When inside label matcher, and located at label name with __name__ match', () => {
    it('Should return label name list', () => {
      const session = getSessionStub({
        currentToken: {
          type: 'entity.name.tag.label-matcher',
          value: 'j',
          index: 5,
          start: 22,
        },
        tokens: [
          { type: 'paren.lparen.label-matcher', value: '{' },
          { type: 'entity.name.tag.label-matcher', value: '__name__' },
          { type: 'keyword.operator.label-matcher', value: '=~' },
          { type: 'string.quoted.label-matcher', value: '"node_cpu"' },
          { type: 'punctuation.operator.label-matcher', value: ',' },
          {
            type: 'entity.name.tag.label-matcher',
            value: 'j',
            index: 5,
            start: 22,
          },
          { type: 'paren.rparen.label-matcher', value: '}' },
        ],
        line: '{__name__=~"node_cpu",j}',
      });

      return completer.getCompletions(editor, session, { row: 0, column: 23 }, 'j', (s, res) => {
        expect(res[0].meta).toEqual('label name');
      });
    });
  });

  describe('When inside label matcher, and located at label value', () => {
    it('Should return label value list', () => {
      const session = getSessionStub({
        currentToken: {
          type: 'string.quoted.label-matcher',
          value: '"n"',
          index: 4,
          start: 13,
        },
        tokens: [
          { type: 'identifier', value: 'node_cpu' },
          { type: 'paren.lparen.label-matcher', value: '{' },
          { type: 'entity.name.tag.label-matcher', value: 'job' },
          { type: 'keyword.operator.label-matcher', value: '=' },
          {
            type: 'string.quoted.label-matcher',
            value: '"n"',
            index: 4,
            start: 13,
          },
          { type: 'paren.rparen.label-matcher', value: '}' },
        ],
        line: 'node_cpu{job="n"}',
      });

      return completer.getCompletions(editor, session, { row: 0, column: 15 }, 'n', (s, res) => {
        expect(res[0].meta).toEqual('label value');
      });
    });
  });

  describe('When inside by', () => {
    it('Should return label name list', () => {
      const session = getSessionStub({
        currentToken: {
          type: 'entity.name.tag.label-list-matcher',
          value: 'm',
          index: 9,
          start: 22,
        },
        tokens: [
          { type: 'paren.lparen', value: '(' },
          { type: 'keyword', value: 'count' },
          { type: 'paren.lparen', value: '(' },
          { type: 'identifier', value: 'node_cpu' },
          { type: 'paren.rparen', value: '))' },
          { type: 'text', value: ' ' },
          { type: 'keyword.control', value: 'by' },
          { type: 'text', value: ' ' },
          { type: 'paren.lparen.label-list-matcher', value: '(' },
          {
            type: 'entity.name.tag.label-list-matcher',
            value: 'm',
            index: 9,
            start: 22,
          },
          { type: 'paren.rparen.label-list-matcher', value: ')' },
        ],
        line: '(count(node_cpu)) by (m)',
      });

      return completer.getCompletions(editor, session, { row: 0, column: 23 }, 'm', (s, res) => {
        expect(res[0].meta).toEqual('label name');
      });
    });
  });
});