import { config } from 'dotenv';
import yargs from 'yargs';
import path from 'path';
import fs from 'fs';
import assert from 'assert';
import { hideBin } from 'yargs/helpers';
import axios from 'axios';

import { Octokit } from '@octokit/rest';

// Load environment variables from .env file
config();

const GITEA_BASE_URL = 'https://git.vdb.to';

interface RepoRecord {
  type: string
  version: string
  schema: string
  name: string
  url: string
  clone_url: string
  owner: {
    name: string
    type: 'Organization' | 'User'
    url: string
  }
  is_private: boolean
  is_archived: boolean
  default_branch: string
  latest_tag: {
    tag_name: string
    url: string
  } | null
  is_fork: boolean
  fork_source: {
    name: string
    url: string
  } | null
  license: {
    name: string
    spdx_id: string
  } | null
}

async function main () {
  const argv = getArgs();

  let repoRecord: RepoRecord;
  if (argv.repoUrl.includes('github.com')) {
    repoRecord = await createRepoRecord(argv.repoUrl);
  } else {
    repoRecord = await createGiteaRepoRecord(argv.repoUrl);
  }

  const jsonData = JSON.stringify(repoRecord, null, 2);

  const recordsDir = path.resolve(argv.recordsDir);
  const recordFile = `${recordsDir}/${repoRecord.name}.json`;
  fs.writeFileSync(recordFile, jsonData, 'utf8');

  console.log(`Repo record written to ${recordFile}`);
}

async function createRepoRecord (repoUrl: string): Promise<RepoRecord> {
  const githubPAT = process.env.GITHUB_TOKEN;
  assert(githubPAT, 'GITHUB_TOKEN not provided');

  const octokit = new Octokit({
    auth: githubPAT
  });

  const { owner, repo } = extractOwnerAndRepo(repoUrl);

  // fetch repo details
  const data = await getRepoDetails(octokit, owner, repo);

  const repoRecord: RepoRecord = {
    type: 'RepositoryRecord',
    version: '0.1.0', // fetch from registry and increment if exists
    schema: '',
    name: data.name,
    url: data.html_url,
    clone_url: data.clone_url,
    owner: {
      name: data.owner.login,
      type: data.owner.type,
      url: data.owner.html_url
    },
    is_private: data.private,
    is_archived: data.archived,
    default_branch: data.default_branch,
    latest_tag: null,
    is_fork: data.fork,
    fork_source: null,
    license: null
  };

  // populate fork source
  if (data.fork) {
    repoRecord.fork_source = {
      name: data.source.name,
      url: data.source.html_url
    };
  }

  // populate license
  if (data.license) {
    repoRecord.license = {
      name: data.license.name,
      spdx_id: data.license.spdx_id
    };
  }

  // fetch and populate latest_tag
  const latestTag = await getRepoLatestTag(octokit, owner, repo);
  if (latestTag) {
    repoRecord.latest_tag = {
      tag_name: latestTag.tag_name,
      url: latestTag.html_url
    };
  }

  return repoRecord;
}

async function createGiteaRepoRecord (repoUrl: string): Promise<RepoRecord> {
  const giteaPAT = process.env.GITEA_TOKEN;
  assert(giteaPAT, 'GITEA_TOKEN not provided');

  const { owner, repo } = extractOwnerAndRepo(repoUrl);

  // fetch repo details
  const data = await getGiteaRepoDetails(giteaPAT, owner, repo);

  const repoRecord: RepoRecord = {
    type: 'RepositoryRecord',
    version: '0.1.0', // fetch from registry and increment if exists
    schema: '',
    name: data.name,
    url: data.html_url,
    clone_url: data.clone_url,
    owner: {
      name: data.owner.login,
      // type: data.owner.type,
      type: 'Organization',
      url: data.owner.html_url
    },
    is_private: data.private,
    is_archived: data.archived,
    default_branch: data.default_branch,
    latest_tag: null,
    is_fork: data.fork,
    fork_source: null,
    license: null
  };

  // populate fork source
  if (data.fork) {
    repoRecord.fork_source = {
      name: data.parent.name,
      url: data.parent.html_url
    };
  }

  // TODO: populate license

  // fetch and populate latest_tag
  const latestTag = await getGiteaRepoLatestTag(giteaPAT, owner, repo);
  if (latestTag) {
    repoRecord.latest_tag = {
      tag_name: latestTag.tag_name,
      url: latestTag.html_url
    };
  }

  return repoRecord;
}

// async function getRepoDetails (octokit: Octokit, repoUrl: string): Promise<RestEndpointMethodTypes["repos"]["get"]["response"]> {
async function getRepoDetails (octokit: Octokit, owner: string, repo: string): Promise<any> {
  try {
    const response = await octokit.repos.get({
      owner: owner,
      repo: repo
    });

    return response.data;
  } catch (error) {
    console.error('Error fetching repository:', error);
  }
}

async function getGiteaRepoDetails (token: string, owner: string, repo: string): Promise<any> {
  try {
    const response = await axios.get(`${GITEA_BASE_URL}/api/v1/repos/${owner}/${repo}`, {
      headers: { Authorization: `token ${token}` }
    });

    return response.data;
  } catch (error) {
    console.error('Error fetching repository:', error);
  }
}

async function getRepoLatestTag (octokit: Octokit, owner: string, repo: string): Promise<any> {
  try {
    const response = await octokit.repos.getLatestRelease({
      owner: owner,
      repo: repo
    });

    return response.data;
  } catch (error: any) {
    if ((error as Error).message.includes('Not Found')) {
      return null;
    }

    console.error('Error fetching latest release:', error);
  }
}

async function getGiteaRepoLatestTag (token: string, owner: string, repo: string): Promise<any> {
  try {
    const response = await axios.get(`${GITEA_BASE_URL}/api/v1/repos/${owner}/${repo}/releases/latest`, {
      headers: { Authorization: `token ${token}` }
    });

    return response.data;
  } catch (error: any) {
    if ((error as Error).message.includes('code 404')) {
      return null;
    }

    console.error('Error fetching latest release:', error);
  }
}

function extractOwnerAndRepo (url: string): { owner: string; repo: string } {
  // eslint-disable-next-line no-useless-escape
  const match = url.match(/(?:github\.com|git\.vdb\.to)\/([^\/]+)\/([^\/]+)(\/|$)/);
  if (!match) {
    throw new Error(`Unable to extract repo owner and name from the given URL: ${url}`);
  }

  return { owner: match[1], repo: match[2] };
}

function getArgs (): any {
  return yargs(hideBin(process.argv)).parserConfiguration({
    'parse-numbers': false
  }).usage('Usage: $0 [options]')
    .option('config', {
      alias: 'c',
      describe: 'Config',
      type: 'string'
    })
    .option('repoUrl', {
      alias: 'r',
      describe: 'Repository URL',
      type: 'string',
      demandOption: true
    })
    .option('recordsDir', {
      alias: 'd',
      describe: 'Directory to export the repo record to',
      type: 'string',
      demandOption: true
    })
    .help().argv;
}

main()
  .catch(err => {
    console.error(err);
  });