import { Z_SYNC_FLUSH } from "zlib";
import Koa from "koa";
import Router from "koa-router";
import * as jwt from "jsonwebtoken";
import koaStatic from "koa-static";
import koaCompress from "koa-compress";
import koaBodyParser from "koa-bodyparser";
import koaJwt from "koa-jwt";
import * as config from "./config";
import api from "./ui/api";
import Authorizer from "./common/authorizer";
import * as logger from "./logger";
import * as localCache from "./local-cache";
import { PermissionSet } from "./types";
import { authSimple } from "./ui/api-functions";

declare module "koa" {
  interface Request {
    body: any;
  }
}

const koa = new Koa();
const router = new Router();

const JWT_SECRET = "" + config.get("UI_JWT_SECRET");
const JWT_COOKIE = "genieacs-ui-jwt";

function getPermissionSets(ctx): PermissionSet[] {
  const allPermissions = localCache.getPermissions(ctx.state.configSnapshot);
  const permissionSets = ctx.state.user.roles.map(role =>
    Object.values(allPermissions[role] || {})
  );
  return permissionSets;
}

koa.on("error", async err => {
  throw err;
});

koa.use(async (ctx, next) => {
  const configSnapshot = await localCache.getCurrentSnapshot();
  ctx.state.configSnapshot = configSnapshot;
  return next();
});

koa.use(
  koaJwt({
    secret: JWT_SECRET,
    passthrough: true,
    cookie: JWT_COOKIE
  })
);

koa.use(async (ctx, next) => {
  if (ctx.state.user && ctx.state.user.roles)
    ctx.state.authorizer = new Authorizer(getPermissionSets(ctx));
  else ctx.state.authorizer = new Authorizer([]);

  return next();
});

router.post("/login", async ctx => {
  if (!JWT_SECRET) {
    ctx.status = 500;
    ctx.body = "UI_JWT_SECRET is not set";
    logger.error({ message: "UI_JWT_SECRET is not set" });
    return;
  }

  const username = ctx.request.body.username;
  const password = ctx.request.body.password;

  const log = {
    message: "Log in",
    context: ctx,
    username: username,
    method: null
  };

  function success(roles, method): void {
    log.method = method;
    const token = jwt.sign({ username, roles }, JWT_SECRET);
    ctx.cookies.set(JWT_COOKIE, token);
    ctx.body = JSON.stringify(token);
    logger.accessInfo(log);
  }

  function failure(): void {
    ctx.status = 400;
    ctx.body = "Incorrect username or password";
    log.message += " failed";
    logger.accessWarn(log);
  }

  const roles = await authSimple(ctx.state.configSnapshot, username, password);

  if (roles) return void success(roles, "simple");

  failure();
});

router.post("/logout", async ctx => {
  ctx.cookies.set(JWT_COOKIE); // Delete cookie
  ctx.body = "";

  logger.accessInfo({
    message: "Log out",
    context: ctx
  });
});

koa.use(async (ctx, next) => {
  if (ctx.request.type === "application/octet-stream")
    ctx.disableBodyParser = true;

  return next();
});

koa.use(koaBodyParser());
router.use("/api", api.routes(), api.allowedMethods());

router.get("/", async ctx => {
  let permissionSets = [];
  if (ctx.state.user && ctx.state.user.roles)
    permissionSets = getPermissionSets(ctx);

  ctx.body = `
  <html>
    <head>
      <title>GenieACS</title>
      <link rel="shortcut icon" type="image/png" href="favicon.png" />
      <link rel="stylesheet" href="app.css">
    </head>
    <body>
      <script>
        window.clientConfig = ${JSON.stringify({
          ui: localCache.getUiConfig(ctx.state.configSnapshot)
        })};
        window.username = ${JSON.stringify(
          ctx.state.user ? ctx.state.user.username : ""
        )};
        window.permissionSets = ${JSON.stringify(permissionSets)};
      </script>
      <script src="app.js"></script>
    </body>
  </html>
  `;
});

koa.use(
  koaCompress({
    flush: Z_SYNC_FLUSH
  })
);

koa.use(router.routes());
koa.use(koaStatic("./public"));

export const listener = koa.callback();