import * as toolrunnner from '@actions/exec/lib/toolrunner';
import test from 'ava';
import * as fs from "fs";
import * as path from "path";

import * as externalQueries from "./external-queries";
import { getRunnerLogger } from './logging';
import {setupTests} from './testing-utils';
import * as util from "./util";

setupTests(test);

test("checkoutExternalQueries", async t => {
  await util.withTmpDir(async tmpDir => {
    // Create a test repo in a subdir of the temp dir.
    // It should have a default branch with two commits after the initial commit, where
    // - the first commit contains files 'a' and 'b'
    // - the second commit contains only 'a'
    // Place the repo in a subdir because we're going to checkout a copy in tmpDir
    const testRepoBaseDir = path.join(tmpDir, 'test-repo-dir');
    const repoName = 'some/repo';
    const repoPath = path.join(testRepoBaseDir, repoName);
    const repoGitDir = path.join(repoPath, '.git');

    // Run the given git command, and return the output.
    // Passes --git-dir and --work-tree.
    // Any stderr output is suppressed until the command fails.
    const runGit = async function(command: string[]): Promise<string> {
      let stdout = '';
      let stderr = '';
      command = [`--git-dir=${repoGitDir}`, `--work-tree=${repoPath}`, ...command];
      console.log('Running: git ' + command.join(' '));
      try {
        await new toolrunnner.ToolRunner('git', command, {
          silent: true,
          listeners: {
            stdout: (data) => { stdout += data.toString(); },
            stderr: (data) => { stderr += data.toString(); },
          }
        }).exec();
      } catch (e) {
        console.log('Command failed: git ' + command.join(' '));
        process.stderr.write(stderr);
        throw e;
      }
      return stdout.trim();
    };

    fs.mkdirSync(repoPath, { recursive: true });
    await runGit(['init', repoPath]);
    await runGit(['config', 'user.email', 'test@github.com']);
    await runGit(['config', 'user.name', 'Test Test']);

    fs.writeFileSync(path.join(repoPath, 'a'), 'a content');
    await runGit(['add', 'a']);
    await runGit(['commit', '-m', 'commit1']);

    fs.writeFileSync(path.join(repoPath, 'b'), 'b content');
    await runGit(['add', 'b']);
    await runGit(['commit', '-m', 'commit1']);
    const commit1Sha = await runGit(['rev-parse', 'HEAD']);

    fs.unlinkSync(path.join(repoPath, 'b'));
    await runGit(['add', 'b']);
    await runGit(['commit', '-m', 'commit2']);
    const commit2Sha = await runGit(['rev-parse', 'HEAD']);



    // Checkout the first commit, which should contain 'a' and 'b'
    t.false(fs.existsSync(path.join(tmpDir, repoName)));
    await externalQueries.checkoutExternalRepository(
      repoName,
      commit1Sha,
      `file://${testRepoBaseDir}`,
      tmpDir,
      getRunnerLogger(true));
    t.true(fs.existsSync(path.join(tmpDir, repoName)));
    t.true(fs.existsSync(path.join(tmpDir, repoName, commit1Sha)));
    t.true(fs.existsSync(path.join(tmpDir, repoName, commit1Sha, 'a')));
    t.true(fs.existsSync(path.join(tmpDir, repoName, commit1Sha, 'b')));



    // Checkout the second commit as well, which should only contain 'a'
    t.false(fs.existsSync(path.join(tmpDir, repoName, commit2Sha)));
    await externalQueries.checkoutExternalRepository(
      repoName,
      commit2Sha,
      `file://${testRepoBaseDir}`,
      tmpDir,
      getRunnerLogger(true));
    t.true(fs.existsSync(path.join(tmpDir, repoName, commit2Sha)));
    t.true(fs.existsSync(path.join(tmpDir, repoName, commit2Sha, 'a')));
    t.false(fs.existsSync(path.join(tmpDir, repoName, commit2Sha, 'b')));
  });
});