import { Collection } from "https://deno.land/x/mongo@v0.31.2/mod.ts";
import * as bcrypt from "https://deno.land/x/bcrypt@v0.4.1/mod.ts";

import { auth, body, rest, schema } from "../server/decorators.ts";
import HttpError from "../server/HttpError.ts";
import User from "../models/User.ts";
import AppRouter from "./AppRouter.ts";
import jwt from "../server/decorators/jwt.ts";
import JWT, { JWTPayload } from "../utils/JWT.ts";
import { now } from "../utils/utils.ts";

export interface SignupRequest {
    username: string;
    password: string;
}
export interface LoginRequest {
    username: string;
    password: string;
}

export default class UserRouter extends AppRouter {
    @rest('GET', '/')
    async get(@schema('string') username: string) {
        const res = await this.users.findOne({ username });

        if (res === undefined) throw new HttpError('User not found.');

        return { username: res.username };
    }
    @rest('GET', '/self')
    async self(@jwt(self => self.salt, true) @auth() auth: JWTPayload) {
        if (auth === undefined) throw new HttpError('You are not logged in.');
        const res = await this.users.findOne({ username: auth.name });

        if (res === undefined) throw new HttpError('User not found.');

        return { username: res.username };
    }

    @rest('POST', '/signup')
    async signup(
        @schema({
            username: 'string',
            password: 'string',
        }) @body() body: SignupRequest
    ) {
        if (await this.users.countDocuments({ username: body.username }) > 0) {
            throw new HttpError('User with the same username already exists.');
        }

        const password = await bcrypt.hash(body.password, this.salt);

        await this.users.insertOne({
            username: body.username,
            password: password,
            images: [],
        });

        return {};
    }
    @rest('POST', '/login')
    async login(
        @schema({
            username: 'string',
            password: 'string'
        }) @body() body: LoginRequest
    ) {
        const res = await this.users.findOne({ username: body.username });
        if (!res) throw new HttpError('Incorrect username or password.');
        const hashed = await bcrypt.hash(body.password, this.salt);

        if (res.password !== hashed) throw new HttpError('Incorrect username or password.');

        const time = now();
        return JWT.encode({
            iat: time,
            exp: time + 3600 * 12,
            name: res.username,
        }, this.salt);
    }

    public constructor(private salt: string, private users: Collection<User>) {
        super();
        users.createIndexes({ indexes: [ { key: { username: 1 }, name: 'Username Index' } ] });
    }
}