import dotenv from "dotenv"
import { createNodeMiddleware } from "octokit"
import express from "express"
import suggester from "code-suggester"
import { type FileDiffContent } from "code-suggester/build/src/types"

import { determineValidHunks, objectToMap } from "./utils"
import { createPullRequestFromDiffContents } from "./create-pr-from-diffcontents"
import { githubApp, webhookApiPath } from "./github-app"
import { userNickname } from "./auth0-mgmt"

import functions from "@codeflash-ai/common/token-functions"
import * as console from "console"

const userForAPIKey = functions.userForAPIKey

if (process.env.NODE_ENV !== "production") {
  console.log("Using .env.local file to supply config environment variables")
  dotenv.config({ path: ".env.local" })
}

const port = process.env.PORT || 3001

const appExpress = express()

appExpress.use((req, res, next) => {
  console.log(`<<< Received ${req.method} request for ${req.url}`)
  console.log(`<<< Request headers: ${JSON.stringify(req.headers)}`)
  console.log(`<<< Request body: ${JSON.stringify(req.body)}`)
  console.log(`<<< Request params: ${JSON.stringify(req.params)}`)
  console.log(`<<< Request query: ${JSON.stringify(req.query)}`)
  next()
})

// Mount the github webhook middleware onto the express application
appExpress.use(createNodeMiddleware(githubApp.webhooks, { path: webhookApiPath }))

appExpress.use(express.json())

appExpress.get("/", async (req, res) => {
  return res.status(200).send("OK")
})

appExpress.get("/healthcheck", async (req, res) => {
  return res.status(200).send("OK")
})

// Middleware to check for valid API key
appExpress.use(async (req, res, next) => {
  const authHeader = req.headers.authorization
  if (!authHeader) {
    return res.status(401).send("Authorization header is missing")
  }

  const apiKey = authHeader.replace(/^Bearer\s+/, "")
  const userId = await userForAPIKey(apiKey)
  if (userId == null) {
    console.log(`Userid null for API key ${apiKey}. Returning 403`)
    return res.status(403).send("Invalid API key")
  }
  req.userId = userId

  next()
})

appExpress.post("/cfapi/suggest-pr-changes", async (req, res) => {
  try {
    const { owner, repo, pullNumber, diffContents, prComment } = req.body
    const userId = req.userId

    if (!repo || !owner || !pullNumber) {
      return res.status(400).send("Missing required fields")
    }

    const nickname = await userNickname(userId)
    if (!nickname) {
      return res.status(401).send("Unauthorized") // Error getting user nickname
    }

    const repoInstallation = await githubApp.octokit.rest.apps.getRepoInstallation({
      owner,
      repo,
    })
    const installationId = repoInstallation.data.id
    const installationOctokit = await githubApp.getInstallationOctokit(installationId)

    try {
      // Check if the user is a collaborator on the repository
      const response = await installationOctokit.rest.repos.checkCollaborator({
        owner,
        repo,
        username: nickname,
      })
      // If the request is successful, the user is a collaborator and we can continue
      if (response.status == 204) {
        console.log(`${nickname} is a collaborator on ${owner}/${repo}`)
      }
    } catch (error) {
      if (error.status === 404) {
        return res.status(401).send("Unauthorized") // User is not a collaborator
      }
      // Handle other potential errors
      return res.status(500).send(`Error`) // Error checking collaborator status
    }

    // Suggest changes

    const diffContentsMap: Map<string, FileDiffContent> = objectToMap(diffContents)

    const { validHunks, invalidHunks } = await determineValidHunks(
      installationOctokit.rest,
      { owner, repo },
      pullNumber,
      100,
      diffContentsMap,
    )

    if (invalidHunks.size > 0) {
      // we can't suggest all of the hunks for this PR, because some of them are invalid (out of scope for this PR).
      // so instead, let's make a new branch, commit the changes,
      // and make a new PR from that branch onto the PR's branch

      const newPrData = await createPullRequestFromDiffContents(
        installationOctokit,
        owner,
        repo,
        pullNumber,
        diffContentsMap,
      )

      // Add explanation comment
      const result = await installationOctokit.rest.issues.createComment({
        owner,
        repo,
        issue_number: newPrData.data.number,
        body: prComment,
      })

      // Respond with the new PR details
      res.json(newPrData.data.number)
    } else {
      // all suggestions are valid and can be made on this PR.
      // let's make the suggestions

      const reviewNumber = await suggester.reviewPullRequest(
        installationOctokit.rest,
        diffContentsMap,
        {
          repo,
          owner,
          pullNumber,
          pageSize: 100,
        },
      )

      // Add explanation comment
      const result = await installationOctokit.rest.issues.createComment({
        owner,
        repo,
        issue_number: pullNumber,
        body: prComment,
      })
      res.json(reviewNumber)
    }
  } catch (error) {
    res.status(500).send(`Error creating pull request: ${error.message}`)
  }
})

// WORKS without express.json() vvvvv
// const router = express.Router();
// // router.use(express.json());
// router.use(createNodeMiddleware(ghApp.webhooks, { path: "/api/github/webhooks" }));
//
// const app = express();
// app.use('/', router);
//
// app.listen(port)

// also works vvvvv
// const server = http.createServer(createNodeMiddleware(ghApp.webhooks));
// server.listen()
// \/\/\/\/\//\/\

// const server = http.createServer(appExpress.);

// Start the server
appExpress.listen(port, () => {
  console.log(
    `Server is listening on ${port} for CF API requests. Github App webhook events mounted at ${webhookApiPath}`,
  )
  console.log("Press Ctrl + C to quit.")
})