/*
 * MIT License
 *
 * Copyright (c) 2022- Minteck
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 */

const fs = require('fs');
const os = require('os');

if (process.argv.includes("--remove")) {
    console.log("Removing the Twilight Package Manager and all installed packages in 5 seconds.");
    console.log("Press Ctrl+C to abort.");
    global.to = 6;
    global.toi = setInterval(() => {
        to--;
        if (to <= 0) {
            clearInterval(toi);
            console.log("");
            console.log("Preparing...");

            if (fs.existsSync(os.homedir() + "/.twilight")) {
                try {
                    fs.mkdirSync(os.homedir() + "/.twilight/.uninstalltest");
                    fs.rmdirSync(os.homedir() + "/.twilight/.uninstalltest");
                } catch (e) {
                    console.log("Error -2: Cannot write to the Twilight install directory.");
                    process.exit(2);
                }
                try {
                    fs.mkdirSync(os.homedir() + "/.uninstalltest");
                    fs.rmdirSync(os.homedir() + "/.uninstalltest");
                } catch (e) {
                    console.log("Error -3: Cannot write to the Twilight install directory's parent directory.");
                    process.exit(3);
                }
            } else {
                console.log("Error -1: Cannot find an existing Twilight install.");
                process.exit(1);
            }

            console.log("Reading installed packages...");
            try {
                global.installed = require(os.homedir() + "/.twilight/installed.json");
            } catch (e) {
                console.log("Error -4: Unable to read installed packages.");
                process.exit(4);
            }
            try {
                global.repository = require(os.homedir() + "/.twilight/repository/list.json").map((i) => {return require(os.homedir() + "/.twilight/repository/" + i.substring(0, 1) + "/" + i + ".json");});
                global.ids = repository.map((i) => { return i.id; });
            } catch (e) {
                console.log("Error -5: Unable to read packages lists.");
                process.exit(4);
            }

            try {
                fs.mkdirSync(os.homedir() + "/Old Twilight Packages");
            } catch (e) {
                console.log("Error -6: Unable to create backup directory.");
                process.exit(6);
            }

            console.log("Backing up installed packages...");
            for (let pkg of installed) {
                if (!ids.includes(pkg.id)) {
                    console.log("Error -7: Unable to find reference to package: " + pkg.id);
                    process.exit(7);
                }
                let select = repository.filter((i) => i.id === pkg.id)[0];

                if (!fs.existsSync(os.homedir() + "/.twilight/packages/" + pkg.id)) {
                    console.log("Error -8: Unable to find package on disk: " + pkg.id);
                    process.exit(8);
                }

                try {
                    fs.renameSync(os.homedir() + "/.twilight/packages/" + pkg.id, os.homedir() + "/Old Twilight Packages/" + select.name.replaceAll("/", ""));
                } catch (e) {
                    console.log("Error -9: Unable to move package to backup directory: " + pkg.id);
                    process.exit(9);
                }

                if (fs.existsSync(os.homedir() + "/.twilight/binaries/" + (select.execname ?? pkg.id) + (os.platform() === "win32" ? ".bat" : ""))) {
                    try {
                        fs.renameSync(os.homedir() + "/.twilight/binaries/" + (select.execname ?? pkg.id) + (os.platform() === "win32" ? ".bat" : ""), os.homedir() + "/Old Twilight Packages/" + select.name.replaceAll("/", "") + "/" + (select.execname ?? pkg.id) + (os.platform() === "win32" ? ".bat" : ""));
                    } catch (e) {
                        console.log("Error -10: Unable to reproduce package executable: " + pkg.id);
                        process.exit(9);
                    }
                }
            }

            console.log("-------------------------------------------------------------------------------");
            console.log("The Twilight Package Manager has now been uninstalled from your system.");
            console.log("You may need to update the $PATH variable and restart your system to complete");
            console.log("the uninstall process.");
            console.log("");
            console.log("To get more details about this change and how it affects the way you use");
            console.log("Minteck's software and services, visit the following the page:");
            console.log("  * https://gitlab.minteck.org/minteck/twilight/-/blob/trunk/README.md");
            console.log("");
            console.log("All packages you had installed, including the command you could have used to");
            console.log("run them, have been moved to the following directory:");
            console.log("  * " + (os.homedir() + "/Old Twilight Packages").replaceAll("/", (os.platform() === "win32" ? "\\" : "/")));
            console.log("");
            console.log("Thanks to everyone who used this package manager!")
            console.log("-------------------------------------------------------------------------------");
        } else {
            process.stdout.write(" ..." + to);
        }
    }, 1000);
} else {
    console.log("-------------------------------------------------------------------------------");
    console.log("The Twilight Package Manager is now out of support and cannot be working again.");
    console.log("Your installed packages are still usable, although it is recommended that you");
    console.log("use the standalone packages instead.");
    console.log("");
    console.log("To get more details about this change and how it affects the way you use");
    console.log("Minteck's software and services, visit the following the page:");
    console.log("  * https://gitlab.minteck.org/minteck/twilight/-/blob/trunk/README.md");
    console.log("");
    console.log("To uninstall the Twilight Package Manager (and your installed packages), run");
    console.log("this command:");
    console.log("  * twi --remove");
    console.log("");
    console.log("Thanks to everyone who used this package manager!")
    console.log("-------------------------------------------------------------------------------");
}