import * as express from "express";
import AnonymousError from "../../core/AnonymousError";
import * as db from "../database";
import UserModel from "../../core/model/users/users.model";
import User from "../../core/User";
import Repository from "../../core/Repository";
import { HTTPError } from "got";
import { RepositoryStatus } from "../../core/types";
import { createLogger, serializeError } from "../../core/logger";

const logger = createLogger("route");

export async function getGist(
  req: express.Request,
  res: express.Response,
  opt?: { nocheck?: boolean }
) {
  try {
    const gist = await db.getGist(req.params.gistId);
    if (opt?.nocheck !== true) {
      if (
        gist.status == "expired" &&
        gist.options.expirationMode == "redirect"
      ) {
        res.redirect(`https://gist.github.com/${gist.source.gistId}`);
        return null;
      }

      await gist.check();
    }
    return gist;
  } catch (error) {
    handleError(error, res, req);
    return null;
  }
}

export async function getPullRequest(
  req: express.Request,
  res: express.Response,
  opt?: { nocheck?: boolean }
) {
  try {
    const pullRequest = await db.getPullRequest(req.params.pullRequestId);
    if (opt?.nocheck !== true) {
      // redirect if the repository is expired
      if (
        pullRequest.status == "expired" &&
        pullRequest.options.expirationMode == "redirect"
      ) {
        res.redirect(
          `https://github.com/${pullRequest.source.repositoryFullName}/pull/${pullRequest.source.pullRequestId}`
        );
        return null;
      }

      await pullRequest.check();
    }
    return pullRequest;
  } catch (error) {
    handleError(error, res, req);
    return null;
  }
}

export async function getRepo(
  req: express.Request,
  res: express.Response,
  opt: { nocheck?: boolean } = {
    nocheck: false,
  }
) {
  try {
    const repo = await db.getRepository(req.params.repoId);
    if (opt.nocheck !== true) {
      // redirect if the repository is expired
      if (
        repo.status == RepositoryStatus.EXPIRED &&
        repo.options.expirationMode == "redirect" &&
        repo.model.source.repositoryId
      ) {
        res.redirect(`https://github.com/${repo.model.source.repositoryName}`);
        return null;
      }

      repo.check();
    }
    return repo;
  } catch (error) {
    handleError(error, res, req);
    return null;
  }
}

export function isOwnerOrAdmin(authorizedUsers: string[], user: User) {
  if (authorizedUsers.indexOf(user.model.id) == -1 && !user.isAdmin) {
    throw new AnonymousError("not_authorized", {
      httpStatus: 401,
    });
  }
}

export function isCoauthor(repo: Repository, user: User): boolean {
  if (!user.username) return false;
  return (repo.model.coauthors || []).some((c) => c.username === user.username);
}

export function isOwnerCoauthorOrAdmin(repo: Repository, user: User) {
  if (user.isAdmin) return;
  if (repo.owner.id === user.model.id) return;
  if (isCoauthor(repo, user)) return;
  throw new AnonymousError("not_authorized", {
    httpStatus: 403,
  });
}

// eslint-disable-next-line @typescript-eslint/no-explicit-any
function printError(error: any, req?: express.Request) {
  if (error instanceof AnonymousError) {
    if (req?.originalUrl === "/api/repo/undefined/options") return;
    const payload = {
      ...serializeError(error),
      url: req?.originalUrl,
    };
    // 4xx are expected client errors (not_found, expired, not_connected) —
    // route them to warn so the admin Errors page can split server faults
    // (5xx) from client misuse (4xx) cleanly.
    const status = error.httpStatus;
    if (typeof status === "number" && status >= 400 && status < 500) {
      logger.warn("anonymous error", payload);
    } else {
      logger.error("anonymous error", payload);
    }
  } else if (error instanceof HTTPError) {
    logger.error("http error", {
      code: error.code,
      message: error.message,
    });
  } else {
    logger.error("unhandled error", serializeError(error));
  }
}

export function handleError(
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  error: any,
  res?: express.Response,
  req?: express.Request
) {
  printError(error, req);
  let errorCode = error;
  if (error instanceof Error) {
    errorCode = error.message;
  } else if (typeof error !== "string") {
    errorCode = String(error);
  }
  let status = 500;
  if (error.httpStatus) {
    status = error.httpStatus;
  } else if (error.$metadata?.httpStatusCode) {
    status = error.$metadata.httpStatusCode;
  } else if (
    errorCode &&
    (errorCode.indexOf("not_found") > -1 ||
      errorCode.indexOf("(Not Found)") > -1)
  ) {
    status = 404;
  } else if (errorCode && errorCode.indexOf("not_connected") > -1) {
    status = 401;
  }
  if (res && !res.headersSent) {
    res.status(status).json({ error: errorCode });
  }
  return;
}

export async function getUser(req: express.Request) {
  function notConnected(): never {
    req.logout((error) => {
      if (error) {
        logger.error("logout failed", serializeError(error));
      }
    });
    throw new AnonymousError("not_connected", {
      httpStatus: 401,
    });
  }
  if (!req.user) {
    notConnected();
  }
  // eslint-disable-next-line @typescript-eslint/no-explicit-any
  const user = (req.user as any).user;
  if (!user) {
    notConnected();
  }
  const model = await UserModel.findById(user._id);
  if (!model) {
    notConnected();
  }
  return new User(model);
}