const logger = require("../utils/logger.util.js");
const path = require("path");
const fs = require("fs");
const uuid = require("uuid");
const app_conf = require("../config/app.conf.js");
const map_conf = require("../config/map.conf.js");
const messages = require("../config/messages.conf.js");

const map = require("../utils/map.util.js");

const express = require('express');
const router = express.Router();

function errorPageRenderer(res, emoji, message) {
    res.render("error", {
        page_title: app_conf.name,
        css_path: path.join(app_conf.paths.css.web, "stylesheet.css"),
        js_path: path.join(app_conf.paths.js.web, "error.js"),
        error_emoji: emoji,
        error_message: message
    })
}

router.delete("/remove", async (req, res) => {
    logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);

    if (req.query["element"]) {
        try {
            fs.unlinkSync(`app/storage/${req.query["element"]}`);
            res.status(200).send();
        } catch (error) {
            res.status(500).send();
            logger.error(error.message);
        }
    } else {
        res.status(400).send();
    }
});

router.post("/upload", async (req, res) => {
    logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);

    if (!req.files || !req.files.file) {
        res.status(422).send();
    } else {
        const uploaded_file = req.files.file;

        let map_name = path.parse(uploaded_file["name"])["name"];
        if (map.mapExists(uploaded_file["name"])) {
            map_name += `_${uuid.v4()}`;
        }

        fs.copyFile(uploaded_file.tempFilePath, `app/storage/${map_name}.csv`, (error) => {
            if (error) {
                logger.error(error);
                res.status(500).send();
            } else {
                res.status(201).send();
            }
        });
    }
});

router.get("/download", async (req, res) => {
    logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);

    if (req.query["element"]) {
        res.download(`app/storage/${req.query["element"]}`);
    } else {
        res.status(400).send();
    }
});

router.post("/add", async (req, res) => {
    logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);

    if (req.body) {
        await map.addMap(`map_${uuid.v4()}.csv`, req.body["meta"], req.body["throttle"], req.body["motor"]);

        res.status(200).send();
    } else {
        res.status(400).send();
    }
});

router.post("/edit", async (req, res) => {
    logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);

    if (req.query["element"] && req.body) {
        try {
            await map.updateMap(req.query["element"], req.body["meta"], req.body["throttle"], req.body["motor"]);

            res.status(200).send();
        } catch (error) {
            res.status(500).send();
            logger.error(error.message);
        }
    } else {
        res.status(400).send();
    }
});

router.get("/add", async (req, res) => {
    logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);

    res.render("add", {
        page_title: app_conf.name,
        program: app_conf.program,
        css_path: path.join(app_conf.paths.css.web, "stylesheet.css"),
        js_path: path.join(app_conf.paths.js.web, "add.js"),
        chartjs: app_conf.paths.chartjs.web + "/chart.umd.js",
        steps: map_conf.steps,
        max_rpm: map_conf.max_rpm,
        max_throttle: map_conf.max_throttle
    });
});

router.get("/edit", async (req, res) => {
    logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);

    const requested_map = req.query["element"];
    if (requested_map) {
        try {
            if (map.mapExists(requested_map)) {
                res.render("edit", {
                    page_title: app_conf.name,
                    program: app_conf.program,
                    css_path: path.join(app_conf.paths.css.web, "stylesheet.css"),
                    js_path: path.join(app_conf.paths.js.web, "edit.js"),
                    chartjs: app_conf.paths.chartjs.web + "/chart.umd.js",
                    map: JSON.stringify(await map.parseMapJson(requested_map, 0)),
                    map_meta: JSON.stringify(await map.parseMapJson(requested_map, 1)),
                    steps: map_conf.steps,
                    max_rpm: map_conf.max_rpm,
                    max_throttle: map_conf.max_throttle
                });
            } else {
                errorPageRenderer(res, "🔍❌", messages.not_found);
            }
        } catch (error) {
            errorPageRenderer(res, "🌋💥", messages.internal_server_error);
            logger.error(error.message);
        }
    } else {
        errorPageRenderer(res, "✋⛔", messages.bad_request);
    }
});

router.get("/", async (req, res) => {
    logger.info(`${req.method}: "${req.url}" => ${req.get("User-Agent")}`);

    try {
        const maps = await map.getAvailableMaps();

        if (Object.keys(maps).length) {
            var table_data = "";
            for (m of Object.keys(maps)) {
                table_data += `<tr><td>${m}</td>`;
                if ("name" in maps[m]) {
                    table_data += `<td>${maps[m]["name"]}</td>`;
                } else {
                    table_data += "<td>-</td>";
                }

                if ("id" in maps[m]) {
                    table_data += `<td>${maps[m]["id"]}</td>`;
                } else {
                    table_data += "<td>-</td>";
                }

                if ("description" in maps[m]) {
                    table_data += `<td>${maps[m]["description"]}</td>`;
                } else {
                    table_data += "<td>-</td>";
                }

                table_data += "</tr>";
            }

            res.render("index", {
                page_title: app_conf.name,
                program: app_conf.program,
                css_path: path.join(app_conf.paths.css.web, "stylesheet.css"),
                js_path: path.join(app_conf.paths.js.web, "index.js"),
                table_data: table_data
            });
        } else {
            errorPageRenderer(res, "&#10067;", messages.empty_db);
        }
    } catch (error) {
        errorPageRenderer(res, "&#127755;&#128165;", messages.internal_server_error);
        logger.error(error.message);
    }
});

router.get("/about", (req, res) => {
    res.render("about", {
        page_title: app_conf.name,
        css_path: path.join(app_conf.paths.css.web, "stylesheet.css"),
        version: app_conf.version
    });
});

module.exports = router;