import logger from '@overleaf/logger'
import GitSyncHandler from './GitSyncHandler.mjs'
import SessionManager from '../Authentication/SessionManager.mjs'
import { expressify } from '@overleaf/promise-utils'

async function configureGitSync(req, res) {
  const projectId = req.params.project_id
  const {
    remoteUrl,
    subPath = '',
    pdfPath = '',
    pushFiles = true,
    pushPdf = true,
    branch = 'main',
  } = req.body

  if (typeof remoteUrl !== 'string' || remoteUrl.trim() === '') {
    return res.status(400).json({ error: 'remoteUrl is required' })
  }

  const trimmedUrl = remoteUrl.trim()
  if (!trimmedUrl.startsWith('https://') && !trimmedUrl.startsWith('git@')) {
    return res.status(400).json({ error: 'remoteUrl must start with https:// or git@' })
  }

  const trimmedSubPath = String(subPath).trim().replace(/^\/+|\/+$/g, '')
  if (trimmedSubPath.includes('..')) {
    return res.status(400).json({ error: 'subPath must not contain ..' })
  }

  const trimmedPdfPath = String(pdfPath).trim().replace(/^\/+/, '')
  if (trimmedPdfPath.includes('..')) {
    return res.status(400).json({ error: 'pdfPath must not contain ..' })
  }

  const trimmedBranch = String(branch).trim()
  if (!/^[a-zA-Z0-9/_.-]+$/.test(trimmedBranch) || trimmedBranch.includes('..')) {
    return res.status(400).json({ error: 'Invalid branch name' })
  }

  await GitSyncHandler.setConfig(projectId, {
    remoteUrl: trimmedUrl,
    subPath: trimmedSubPath,
    pdfPath: trimmedPdfPath,
    pushFiles: Boolean(pushFiles),
    pushPdf: Boolean(pushPdf),
    branch: trimmedBranch,
  })
  logger.debug({ projectId }, 'git sync: config saved')
  res.sendStatus(204)
}

async function pushToGit(req, res) {
  const projectId = req.params.project_id
  try {
    const userId = SessionManager.getLoggedInUserId(req.session)
    const { buildId, clsiServerId } = req.body ?? {}
    const { remoteUrl, subPath, pdfPath, pushFiles, pushPdf, branch } =
      await GitSyncHandler.getConfig(projectId)
    if (!remoteUrl) {
      return res.status(400).json({ error: 'No git remote configured for this project' })
    }
    logger.debug({ projectId }, 'git sync: starting push')
    await GitSyncHandler.pushToRemote(projectId, remoteUrl, subPath, {
      pdfPath,
      pdfBuildId: buildId,
      pdfClsiServerId: clsiServerId,
      userId,
      pushFiles,
      pushPdf,
      branch,
    })
    res.sendStatus(204)
  } catch (err) {
    logger.warn({ err, projectId }, 'git sync: push failed')
    res.status(500).json({ error: err.message })
  }
}

async function pullFromGit(req, res) {
  const projectId = req.params.project_id
  try {
    const userId = SessionManager.getLoggedInUserId(req.session)
    const { remoteUrl, subPath } = await GitSyncHandler.getConfig(projectId)
    if (!remoteUrl) {
      return res.status(400).json({ error: 'No git remote configured for this project' })
    }
    logger.debug({ projectId }, 'git sync: starting pull')
    await GitSyncHandler.pullFromRemote(projectId, remoteUrl, subPath, userId)
    res.sendStatus(204)
  } catch (err) {
    logger.warn({ err, projectId }, 'git sync: pull failed')
    res.status(500).json({ error: err.message })
  }
}

async function getGitSyncConfig(req, res) {
  const projectId = req.params.project_id
  const config = await GitSyncHandler.getConfig(projectId)
  res.json({
    remoteUrl: config.remoteUrl ?? '',
    subPath: config.subPath,
    pdfPath: config.pdfPath,
    pushFiles: config.pushFiles,
    pushPdf: config.pushPdf,
    branch: config.branch,
  })
}

export default {
  configureGitSync: expressify(configureGitSync),
  pushToGit: expressify(pushToGit),
  pullFromGit: expressify(pullFromGit),
  getGitSyncConfig: expressify(getGitSyncConfig),
}