// @flow
import Router from "koa-router";
import { reject } from "lodash";
import auth from "../middlewares/authentication";
import { presentUser, presentTeam, presentPolicies } from "../presenters";
import { Team } from "../models";
import { signin } from "../../shared/utils/routeHelpers";
import { parseDomain, isCustomSubdomain } from "../../shared/utils/domains";

const router = new Router();

let services = [];

if (process.env.GOOGLE_CLIENT_ID) {
  services.push({
    id: "google",
    name: "Google",
    authUrl: signin("google"),
  });
}

if (process.env.SLACK_KEY) {
  services.push({
    id: "slack",
    name: "Slack",
    authUrl: signin("slack"),
  });
}

services.push({
  id: "email",
  name: "Email",
  authUrl: "",
});

function filterServices(team) {
  let output = services;

  if (team && !team.googleId) {
    output = reject(output, service => service.id === "google");
  }
  if (team && !team.slackId) {
    output = reject(output, service => service.id === "slack");
  }
  if (!team || !team.guestSignin) {
    output = reject(output, service => service.id === "email");
  }

  return output;
}

router.post("auth.config", async ctx => {
  // If self hosted AND there is only one team then that team becomes the
  // brand for the knowledge base and it's guest signin option is used for the
  // root login page.
  if (process.env.DEPLOYMENT !== "hosted") {
    const teams = await Team.findAll();

    if (teams.length === 1) {
      const team = teams[0];
      ctx.body = {
        data: {
          name: team.name,
          services: filterServices(team),
        },
      };
      return;
    }
  }

  // If subdomain signin page then we return minimal team details to allow
  // for a custom screen showing only relevant signin options for that team.
  if (
    process.env.SUBDOMAINS_ENABLED === "true" &&
    isCustomSubdomain(ctx.request.hostname)
  ) {
    const domain = parseDomain(ctx.request.hostname);
    const subdomain = domain ? domain.subdomain : undefined;
    const team = await Team.findOne({
      where: { subdomain },
    });

    if (team) {
      ctx.body = {
        data: {
          name: team.name,
          hostname: ctx.request.hostname,
          services: filterServices(team),
        },
      };
      return;
    }
  }

  // Otherwise, we're requesting from the standard root signin page
  ctx.body = {
    data: {
      services: filterServices(),
    },
  };
});

router.post("auth.info", auth(), async ctx => {
  const user = ctx.state.user;
  const team = await Team.findByPk(user.teamId);

  ctx.body = {
    data: {
      user: presentUser(user, { includeDetails: true }),
      team: presentTeam(team),
    },
    policies: presentPolicies(user, [team]),
  };
});

export default router;