import addressparser from 'addressparser';
import {copy} from 'fs-extra';
import * as fs from 'fs';
import * as os from 'os';
import * as path from 'path';
import * as core from '@actions/core';
import * as git from './git';

async function run() {
  try {
    const domain: string = core.getInput('domain') || 'github.com';
    const repo: string = core.getInput('repo') || process.env['GITHUB_REPOSITORY'] || '';
    const targetBranch: string = core.getInput('target_branch') || git.defaults.targetBranch;
    const keepHistory: boolean = /true/i.test(core.getInput('keep_history'));
    const allowEmptyCommit: boolean = /true/i.test(core.getInput('allow_empty_commit'));
    const buildDir: string = core.getInput('build_dir', {required: true});
    const absoluteBuildDir: boolean = /true/i.test(core.getInput('absolute_build_dir'));
    const followSymlinks: boolean = /true/i.test(core.getInput('follow_symlinks'));
    const committer: string = core.getInput('committer') || git.defaults.committer;
    const author: string = core.getInput('author') || git.defaults.author;
    const commitMessage: string = core.getInput('commit_message') || git.defaults.message;
    const fqdn: string = core.getInput('fqdn');
    const nojekyll: boolean = /false/i.test(core.getInput('jekyll'));
    const dryRun: boolean = /true/i.test(core.getInput('dry_run'));
    const verbose: boolean = /true/i.test(core.getInput('verbose'));

    if (!fs.existsSync(buildDir)) {
      core.setFailed('Build dir does not exist');
      return;
    }

    let remoteURL = String('https://');
    if (process.env['GH_PAT']) {
      core.debug(`Use GH_PAT`);
      remoteURL = remoteURL.concat(process.env['GH_PAT'].trim(), '@');
    } else if (process.env['GITHUB_TOKEN']) {
      core.debug(`Use GITHUB_TOKEN`);
      remoteURL = remoteURL.concat('x-access-token:', process.env['GITHUB_TOKEN'].trim(), '@');
    } else if (!dryRun) {
      core.setFailed('You have to provide a GITHUB_TOKEN or GH_PAT');
      return;
    }
    remoteURL = remoteURL.concat(domain, '/', repo, '.git');
    core.debug(`remoteURL=${remoteURL}`);

    const remoteBranchExists: boolean = await git.remoteBranchExists(remoteURL, targetBranch);
    core.debug(`remoteBranchExists=${remoteBranchExists}`);
    const tmpdir = fs.mkdtempSync(path.join(os.tmpdir(), 'github-pages-'));
    core.debug(`tmpdir=${tmpdir}`);
    const currentdir = path.resolve('.');
    core.debug(`currentdir=${currentdir}`);

    process.chdir(tmpdir);

    if (keepHistory && remoteBranchExists) {
      core.startGroup(`Cloning ${repo}`);
      await git.clone(remoteURL, targetBranch, '.');
      core.endGroup();
    } else {
      core.startGroup(`Initializing local git repo`);
      await git.init('.');
      await git.checkout(targetBranch);
      core.endGroup();
    }

    let copyCount = 0;
    await core.group(`Copying ${path.join(currentdir, buildDir)} to ${tmpdir}`, async () => {
      const sourcePath = absoluteBuildDir ? buildDir : path.join(currentdir, buildDir);
      await copy(sourcePath, tmpdir, {
        filter: (src, dest) => {
          if (verbose) {
            core.info(`${src} => ${dest}`);
          } else {
            if (copyCount > 1 && copyCount % 80 === 0) {
              process.stdout.write('\n');
            }
            process.stdout.write('.');
            copyCount++;
          }
          return true;
        },
        dereference: followSymlinks
      }).catch(error => {
        core.error(error);
      });
      core.info(`${copyCount} file(s) copied.`);
    });

    if (fqdn) {
      core.info(`Writing ${fqdn} domain name to ${path.join(tmpdir, 'CNAME')}`);
      await fs.writeFileSync(path.join(tmpdir, 'CNAME'), fqdn.trim());
    }

    if (nojekyll) {
      core.info(`Disabling Jekyll support via ${path.join(tmpdir, '.nojekyll')}`);
      await fs.writeFileSync(path.join(tmpdir, '.nojekyll'), '');
    }

    const isDirty: boolean = await git.isDirty();
    core.debug(`isDirty=${isDirty}`);
    if (keepHistory && remoteBranchExists && !isDirty) {
      core.info('No changes to commit');
      return;
    }

    const committerPrs: addressparser.Address = addressparser(committer)[0];
    core.startGroup(`Configuring git committer`);
    await git.setConfig('user.name', committerPrs.name);
    await git.setConfig('user.email', committerPrs.address);
    core.endGroup();

    if (!(await git.hasChanges())) {
      core.info('Nothing to deploy');
      return;
    }

    core.startGroup(`Updating index of working tree`);
    await git.add('.', verbose);
    core.endGroup();

    const authorPrs: addressparser.Address = addressparser(author)[0];
    await core.group(`Committing changes`, async () => {
      await git.commit(allowEmptyCommit, `${authorPrs.name} <${authorPrs.address}>`, commitMessage);
      await git.showStat().then(output => {
        core.info(output);
      });
    });

    if (!dryRun) {
      core.startGroup(`Pushing ${buildDir} directory to ${targetBranch} branch on ${repo} repo`);
      if (!keepHistory) {
        core.debug(`Force push`);
      }
      await git.push(remoteURL, targetBranch, !keepHistory);
      core.endGroup();
      core.info(`Content of ${buildDir} has been deployed to GitHub Pages!`);
    } else {
      core.warning(`Push disabled (dry run)`);
    }

    process.chdir(currentdir);
  } catch (error) {
    core.setFailed(error.message);
  }
}

run();