import express from "express";
import { body, param, validationResult } from "express-validator";
import { authenticateRoute } from "../../../auth";
import { query } from "../../../database";
import { errors } from "../../../errors";

const router = express.Router();

router.post(
    "/",
    authenticateRoute(),
    body("name").isLength({ min: 1, max: 40 }).isAlphanumeric("en-US", { ignore: " _-" }),
    async (req, res) => {
        const validationErrors = validationResult(req);
        if (!validationErrors.isEmpty()) {
            return res.status(400).json({ ...errors.INVALID_DATA, errors: validationErrors.array() });
        }

        const { name } = req.body;
        const result = await query("INSERT INTO channels(name, owner_id) VALUES ($1, $2) RETURNING id, name, owner_id", [name, req.user.id]);
        if (result.rowCount < 1) {
            return res.status(500).json({
                ...errors.GOT_NO_DATABASE_DATA
            });
        }

        res.status(201).send(result.rows[0]);
    }
);

router.put(
    "/:id",
    authenticateRoute(),
    body("name").isLength({ min: 1, max: 40 }).isAlphanumeric("en-US", { ignore: " _-" }),
    param("id").isNumeric(),
    async (req, res) => {
        const validationErrors = validationResult(req);
        if (!validationErrors.isEmpty()) {
            return res.status(400).json({ ...errors.INVALID_DATA, errors: validationErrors.array() });
        }

        const { name } = req.body;
        const { id } = req.params;

        const permissionCheckResult = await query("SELECT owner_id FROM channels WHERE id = $1", [id]);
        if (permissionCheckResult.rowCount < 1) {
            return res.status(404).json({
                ...errors.NOT_FOUND
            });
        }
        if (permissionCheckResult.rows[0].owner_id !== req.user.id) {
            return res.status(403).json({
                ...errors.FORBIDDEN_DUE_TO_MISSING_PERMISSIONS
            });
        }

        const result = await query("UPDATE channels SET name = $1 WHERE id = $2", [name, id]);
        if (result.rowCount < 1) {
            return res.status(500).json({
                ...errors.GOT_NO_DATABASE_DATA
            });
        }

        return res.status(200).send({
            id: parseInt(id), // TODO: ??
            name,
            owner_id: permissionCheckResult.rows[0].owner_id
        });
    }
);

router.delete(
    "/:id",
    authenticateRoute(),
    param("id").isNumeric(),
    async (req, res) => {
        const validationErrors = validationResult(req);
        if (!validationErrors.isEmpty()) {
            return res.status(400).json({ ...errors.INVALID_DATA, errors: validationErrors.array() });
        }

        const { id } = req.params;

        const permissionCheckResult = await query("SELECT owner_id FROM channels WHERE id = $1", [id]);
        if (permissionCheckResult.rowCount < 1) {
            return res.status(404).json({
                ...errors.NOT_FOUND
            });
        }
        if (permissionCheckResult.rows[0].owner_id !== req.user.id) {
            return res.status(403).json({
                ...errors.FORBIDDEN_DUE_TO_MISSING_PERMISSIONS
            });
        }

        const result = await query("DELETE FROM channels WHERE id = $1", [id]);
        if (result.rowCount < 1) {
            return res.status(500).json({
                ...errors.GOT_NO_DATABASE_DATA
            });
        }

        return res.status(204).send("");
    }
);


router.get(
    "/:id",
    authenticateRoute(),
    param("id").isNumeric(),
    async (req, res) => {
        const { id } = req.params;
        const result = await query("SELECT id, name, owner_id FROM channels WHERE id = $1", [id]);
        if (result.rowCount < 1) {
            return res.status(404).json({
                ...errors.NOT_FOUND
            });
        }

        return res.status(200).send(result.rows[0]);
    }
);

export default router;